canvas

package
v0.1.5 Latest Latest
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 Go to latest Published: Apr 20, 2026 License: BSD-3-Clause Imports: 48 Imported by: 0

README

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Cogent Canvas is an SVG-based vector drawing program, with basic capabilities similar to Inkscape, although it currently lacks many of the more advanced features (see TODO list below for plans). The native file format is SVG, with optional Inkscape-based metadata to encode advanced style properties.

The Canvas interface is designed to make the high-frequency operations obvious and easy to access, and compared to Inkscape or Adobe Illustrator, it should generally be easier to use by a naive user. It also provides a full tree view into the underlying SVG structure, so you can easily directly manipulate it.

Because it is written in Cogent Core, it also runs on the web and mobile devices.

Behavior

  • Multiple select actions keep doing down even inside groups, and you can always perform operations on elements inside groups, so you don't need to ungroup and re-group.

  • To support the above behavior, you need to hold down the Alt key on control knobs to rotate, whereas Inkscape uses further clicking to switch between move and rotate.

Install

You can use the deployed web version. You can also use the simple Go install command:

$ go install cogentcore.org/cogent/canvas/cmd/canvas@main

Exporting to PDF currently depends on Inkscape. On the Mac you need to make a link to /usr/local/bin and likewise for Linux:

$ sudo ln -s /Applications/Inkscape.app/Contents/MacOS/inkscape /usr/local/bin/

Status

  • June, 2025: full basic functionality now in place, including drawing new paths and editing path control points.

Tips

  • Use layers! Incredibly useful for toggling editability and visibility of whole sets of elements. It is best to make the layers at the start and add as you go. Click on the layer to set which layer new elements are made in by default (duplicates always go into the same layer as the original).

TODO

Simpler, near term

  • ArcTo support in node editor, and arc tool.

  • Gradient editor edits gradient control points.

  • Figure out alternatives to modifier keys for for ipad.

  • Transform panel for numerical rotate, scale etc.

  • Dropper = grab style from containing node, apply to selection -- don't affect selection!

  • Convert shape nodes to path: add svg.Node ToPath.

  • Align panel: add distribute function.

  • Better ways of managing Text with multiple tspan elements: styles for tspan, generate full Text and spans from a rich text source with line wrapping and HTML markup -- need bidirectional support to / from existing tspans etc. Basic pos movement of sub-tspan would be useful.

  • Clip mask in core.SVG finally.

  • Import svg -- same as marker (copy/paste is now working across drawings, so that is good).

  • Path effects menu / chooser and add calls to the various existing ppath intersect and stroke functions.

Longer term

  • More natural drawing modes like freehand and calligraphy.

  • More advanced path effects.

  • More advanced drawing tools like grids, connected diagram elements (key!), etc.

Documentation

Overview

Package canvas implements a 2D vector graphics editor.

Index

Constants

View Source 
const (
	HandleSpriteDp  = 12
	HandleSizeMin   = 12
	HandleBorderMin = 1
)
View Source 
const (
	SpriteLineBorderWidth = 4
	SpriteLineWidth       = 2
)

Variables

View Source 
var (
	// AllDashesMap contains all of the available Dashes.
	// it is initialized from StdDashesMap
	AllDashesMap map[string][]float64

	// AllDashNames contains all of the available dash names.
	// it is initialized from StdDashNames.
	AllDashNames []string

	// AllDashItems contains all of the available dash names for chooser.
	AllDashItems []core.ChooserItem
)
View Source 
var (
	// AllMarkersXMLMap contains all of the available Markers as XML
	// source.  It is initialized from StdMarkersMap
	AllMarkersXMLMap map[string]string

	// AllMarkersSVGMap contains all of the available Markers
	// as *svg.Marker elements that have been converted from
	// the XML source.
	AllMarkersSVGMap map[string]*svg.Marker

	// AllMarkerNames contains all of the available marker names.
	// it is initialized from StdMarkerNames.
	AllMarkerNames []string

	// AllMarkerItems contains all of the available marker names for chooser.
	// All names have marker- prefix in addition to regular marker names.
	AllMarkerItems []core.ChooserItem
)
View Source 
var (
	// RecentPaths is a slice of recent file paths
	RecentPaths core.FilePaths

	// SavedPathsFilename is the name of the saved file paths file in Cogent Code data directory
	SavedPathsFilename = "saved-paths.json"
)
View Source 
var (
	// Splits are the proportions for main window splits, saved and loaded
	Splits = [3]float32{0.15, 0.60, 0.25}

	// SplitsSettingsFilename is the name of the settings file in App prefs
	// directory for saving / loading the current splits
	SplitsSettingsFilename = "splits-settings.json"
)
View Source 
var ActionHelpMap = map[Actions]string{
	Move:     "<b>Alt</b> = move without snapping, <b>Ctrl</b> = constrain to axis with smallest delta",
	Reshape:  "<b>Alt</b> = rotate, <b>Ctrl</b> = constrain to axis with smallest delta",
	NodeMove: "<b>Alt</b> = only move node, not control points, <b>Ctrl</b> = constrain to axis with smallest delta",
	CtrlMove: "<b>Ctrl</b> = constrain to axis with smallest delta",
}

ActionHelpMap contains a set of help strings for different actions.

View Source 
var AlignIcons = map[Aligns]icons.Icon{AlignRightAnchor: cicons.AlignRightAnchor, AlignLeft: cicons.AlignLeft, AlignCenter: cicons.AlignCenter, AlignRight: cicons.AlignRight, AlignLeftAnchor: cicons.AlignLeftAnchor, AlignBaselineHoriz: cicons.AlignBaselineHoriz, AlignBottomAnchor: cicons.AlignBottomAnchor, AlignTop: cicons.AlignTop, AlignMiddle: cicons.AlignMiddle, AlignBottom: cicons.AlignBottom, AlignTopAnchor: cicons.AlignTopAnchor, AlignBaselineVert: cicons.AlignBaselineVert}
View Source 
var Settings = &SettingsData{
	SettingsBase: core.SettingsBase{
		Name: "Canvas",
		File: filepath.Join(core.TheApp.DataDir(), "Cogent Canvas", "settings.toml"),
	},
}

Settings are the overall Code settings

View Source 
var StandardDashNames = []string{
	"dash-solid",
	"dash-1-1",
	"dash-1-2",
	"dash-1-3",
	"dash-1-4",
	"dash-1-6",
	"dash-1-8",
	"dash-1-12",
	"dash-1-24",
	"dash-1-48",
	"dash-empty",
	"dash-2-1",
	"dash-3-1",
	"dash-4-1",
	"dash-6-1",
	"dash-8-1",
	"dash-12-1",
	"dash-24-1",
	"dash-2-2",
	"dash-3-3",
	"dash-4-4",
	"dash-6-6",
	"dash-8-8",
	"dash-12-12",
	"dash-24-24",
	"dash-2-4",
	"dash-4-2",
	"dash-2-6",
	"dash-6-2",
	"dash-4-8",
	"dash-8-4",
	"dash-2-1-012-1",
	"dash-4-2-1-2",
	"dash-8-2-1-2",
	"dash-012-012",
	"dash-014-014",
	"dash-0110-0110",
}

StandardDashNames are standard dash patterns

View Source 
var StandardDashesMap = map[string][]float64{
	"dash-solid":     nil,
	"dash-1-1":       {1, 1},
	"dash-1-2":       {1, 2},
	"dash-1-3":       {1, 3},
	"dash-1-4":       {1, 4},
	"dash-1-6":       {1, 6},
	"dash-1-8":       {1, 8},
	"dash-1-12":      {1, 12},
	"dash-1-24":      {1, 24},
	"dash-1-48":      {1, 48},
	"dash-empty":     {0, 11},
	"dash-2-1":       {2, 1},
	"dash-3-1":       {3, 1},
	"dash-4-1":       {4, 1},
	"dash-6-1":       {6, 1},
	"dash-8-1":       {8, 1},
	"dash-12-1":      {12, 1},
	"dash-24-1":      {24, 1},
	"dash-2-2":       {2, 2},
	"dash-3-3":       {3, 3},
	"dash-4-4":       {4, 4},
	"dash-6-6":       {6, 6},
	"dash-8-8":       {8, 8},
	"dash-12-12":     {12, 12},
	"dash-24-24":     {24, 24},
	"dash-2-4":       {2, 4},
	"dash-4-2":       {4, 2},
	"dash-2-6":       {2, 6},
	"dash-6-2":       {6, 2},
	"dash-4-8":       {4, 8},
	"dash-8-4":       {8, 4},
	"dash-2-1-012-1": {2, 1, 0.5, 1},
	"dash-4-2-1-2":   {4, 2, 1, 2},
	"dash-8-2-1-2":   {8, 2, 1, 2},
	"dash-012-012":   {0.5, 0.5},
	"dash-014-014":   {0.25, 0.25},
	"dash-0110-0110": {0.1, 0.1},
}

StandardDashesMap are standard dash patterns

View Source 
var StandardMarkerNames = []string{
	"-",

	"Arrow1Sstart",
	"Arrow1Send",
	"Arrow1Mstart",
	"Arrow1Mend",
	"Arrow1Lstart",
	"Arrow1Lend",

	"Arrow2Sstart",
	"Arrow2Send",
	"Arrow2Mstart",
	"Arrow2Mend",
	"Arrow2Lstart",
	"Arrow2Lend",

	"Tail",

	"DistanceStart",
	"DistanceEnd",

	"DotS",
	"DotM",
	"DotL",

	"SquareS",
	"SquareM",
	"SquareL",

	"DiamondS",
	"DiamondM",
	"DiamondL",

	"DiamondSstart",
	"DiamondSend",
	"DiamondMstart",
	"DiamondMend",
	"DiamondLstart",
	"DiamondLend",

	"EmptyDiamondS",
	"EmptyDiamondM",
	"EmptyDiamondL",

	"EmptyDiamondSstart",
	"EmptyDiamondSend",
	"EmptyDiamondMstart",
	"EmptyDiamondMend",
	"EmptyDiamondLstart",
	"EmptyDiamondLend",

	"TriangleInS",
	"TriangleInM",
	"TriangleInL",

	"TriangleOutS",
	"TriangleOutM",
	"TriangleOutL",

	"EmptyTriangleInS",
	"EmptyTriangleInM",
	"EmptyTriangleInL",

	"EmptyTriangleOutS",
	"EmptyTriangleOutM",
	"EmptyTriangleOutL",

	"StopS",
	"StopM",
	"StopL",

	"SemiCircleIn",
	"SemiCircleOut",

	"CurveIn",
	"CurveOut",
	"CurvyCross",

	"Scissors",
	"Legs",
	"Torso",
	"Club",
	"RazorWire",

	"InfiniteLineStart",
	"InfiniteLineEnd",
}

StandardMarkerNames is an ordered list of marker names

View Source 
var StandardMarkersMap = map[string]string{
	"-": "",
	"Arrow1Lstart": `<marker style="overflow:visible" id="Arrow1Lstart" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow1Lstart">
      <path transform="scale(0.8) translate(12.5,0)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M 0.0,0.0 L 5.0,-5.0 L -12.5,0.0 L 5.0,5.0 L 0.0,0.0 z "/>
    </marker>`,
	"Arrow1Lend": `<marker style="overflow:visible;" id="Arrow1Lend" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow1Lend">
      <path transform="scale(0.8) rotate(180) translate(12.5,0)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt;" d="M 0.0,0.0 L 5.0,-5.0 L -12.5,0.0 L 5.0,5.0 L 0.0,0.0 z "/>
    </marker>`,

	"Arrow1Mstart": `<marker style="overflow:visible" id="Arrow1Mstart" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow1Mstart">
      <path transform="scale(0.4) translate(10,0)" style="fill-rule:nonzero;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M 0.0,0.0 L 5.0,-5.0 L -12.5,0.0 L 5.0,5.0 L 0.0,0.0 z "/>
    </marker>`,
	"Arrow1Mend": `<marker style="overflow:visible;" id="Arrow1Mend" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow1Mend">
      <path transform="scale(0.4) rotate(180) translate(10,0)" style="fill-rule:nonzero;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt;" d="M 0.0,0.0 L 5.0,-5.0 L -12.5,0.0 L 5.0,5.0 L 0.0,0.0 z "/>
    </marker>`,

	"Arrow1Sstart": `<marker style="overflow:visible" id="Arrow1Sstart" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow1Sstart">
      <path transform="scale(0.2) translate(6,0)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M 0.0,0.0 L 5.0,-5.0 L -12.5,0.0 L 5.0,5.0 L 0.0,0.0 z "/>
    </marker>`,
	"Arrow1Send": `<marker style="overflow:visible;" id="Arrow1Send" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow1Send">
      <path transform="scale(0.2) rotate(180) translate(6,0)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt;" d="M 0.0,0.0 L 5.0,-5.0 L -12.5,0.0 L 5.0,5.0 L 0.0,0.0 z "/>
    </marker>`,

	"Arrow2Lstart": `<marker style="overflow:visible" id="Arrow2Lstart" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow2Lstart">
      <path transform="scale(1.1) translate(1,0)" d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z " style="fill-rule:evenodd;fill:context-stroke;stroke-width:0.62500000;stroke-linejoin:round"/>
    </marker>`,
	"Arrow2Lend": `<marker style="overflow:visible;" id="Arrow2Lend" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow2Lend">
      <path transform="scale(1.1) rotate(180) translate(1,0)" d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z " style="fill-rule:evenodd;fill:context-stroke;stroke-width:0.62500000;stroke-linejoin:round;"/>
    </marker>`,

	"Arrow2Mstart": `<marker style="overflow:visible" id="Arrow2Mstart" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow2Mstart">
      <path transform="scale(0.6) translate(0,0)" d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z " style="fill-rule:evenodd;fill:context-stroke;stroke-width:0.62500000;stroke-linejoin:round"/>
    </marker>`,
	"Arrow2Mend": `<marker style="overflow:visible;" id="Arrow2Mend" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow2Mend">
      <path transform="scale(0.6) rotate(180) translate(0,0)" d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z " style="fill-rule:evenodd;fill:context-stroke;stroke-width:0.62500000;stroke-linejoin:round;"/>
    </marker>`,

	"Arrow2Sstart": `<marker style="overflow:visible" id="Arrow2Sstart" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow2Sstart">
      <path transform="scale(0.3) translate(-2.3,0)" d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z " style="fill-rule:evenodd;fill:context-stroke;stroke-width:0.62500000;stroke-linejoin:round"/>
    </marker>`,
	"Arrow2Send": `<marker style="overflow:visible;" id="Arrow2Send" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow2Send">
      <path transform="scale(0.3) rotate(180) translate(-2.3,0)" d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z " style="fill-rule:evenodd;fill:context-stroke;stroke-width:0.62500000;stroke-linejoin:round;"/>
    </marker>`,

	"Tail": `<marker style="overflow:visible" id="Tail" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Tail">
      <g transform="scale(-1.2)">
        <path style="fill:none;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.8;stroke-linecap:round" d="M -3.8048674,-3.9585227 L 0.54352094,0"/>
        <path style="fill:none;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.8;stroke-linecap:round" d="M -1.2866832,-3.9585227 L 3.0617053,0"/>
        <path style="fill:none;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.8;stroke-linecap:round" d="M 1.3053582,-3.9585227 L 5.6537466,0"/>
        <path style="fill:none;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.8;stroke-linecap:round" d="M -3.8048674,4.1775838 L 0.54352094,0.21974226"/>
        <path style="fill:none;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.8;stroke-linecap:round" d="M -1.2866832,4.1775838 L 3.0617053,0.21974226"/>
        <path style="fill:none;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.8;stroke-linecap:round" d="M 1.3053582,4.1775838 L 5.6537466,0.21974226"/>
      </g>
    </marker>`,

	"DistanceStart": `<marker inkscape:stockid="DistanceStart" orient="auto" refY="0.0" refX="0.0" id="DistanceStart" style="overflow:visible">
      <g id="g2300">
        <path id="path2306" d="M 0,0 L 2,0" style="fill:none;stroke:context-fill;stroke-width:1.15;stroke-linecap:square"/>
        <path id="path2302" d="M 0,0 L 13,4 L 9,0 13,-4 L 0,0 z " style="fill:context-stroke;fill-rule:evenodd;stroke:none"/>
        <path id="path2304" d="M 0,-4 L 0,40" style="fill:none;stroke:context-stroke;stroke-width:1;stroke-linecap:square"/>
      </g>
    </marker>`,
	"DistanceEnd": `<marker inkscape:stockid="DistanceEnd" orient="auto" refY="0.0" refX="0.0" id="DistanceEnd" style="overflow:visible">
      <g id="g2301">
        <path id="path2316" d="M 0,0 L -2,0" style="fill:none;stroke:context-fill;stroke-width:1.15;stroke-linecap:square"/>
        <path id="path2312" d="M 0,0 L -13,4 L -9,0 -13,-4 L 0,0 z " style="fill:context-stroke;fill-rule:evenodd;stroke:none"/>
        <path id="path2314" d="M 0,-4 L 0,40" style="fill:none;stroke:context-stroke;stroke-width:1;stroke-linecap:square"/>
      </g>
    </marker>`,

	"DotL": `<marker style="overflow:visible" id="DotL" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="DotL">
      <path transform="scale(0.8) translate(7.4, 1)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M -2.5,-1.0 C -2.5,1.7600000 -4.7400000,4.0 -7.5,4.0 C -10.260000,4.0 -12.5,1.7600000 -12.5,-1.0 C -12.5,-3.7600000 -10.260000,-6.0 -7.5,-6.0 C -4.7400000,-6.0 -2.5,-3.7600000 -2.5,-1.0 z "/>
    </marker>`,
	"DotM": `<marker style="overflow:visible" id="DotM" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="DotM">
      <path transform="scale(0.4) translate(7.4, 1)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M -2.5,-1.0 C -2.5,1.7600000 -4.7400000,4.0 -7.5,4.0 C -10.260000,4.0 -12.5,1.7600000 -12.5,-1.0 C -12.5,-3.7600000 -10.260000,-6.0 -7.5,-6.0 C -4.7400000,-6.0 -2.5,-3.7600000 -2.5,-1.0 z "/>
    </marker>`,
	"DotS": `<marker style="overflow:visible" id="DotS" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="DotS">
      <path transform="scale(0.2) translate(7.4, 1)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M -2.5,-1.0 C -2.5,1.7600000 -4.7400000,4.0 -7.5,4.0 C -10.260000,4.0 -12.5,1.7600000 -12.5,-1.0 C -12.5,-3.7600000 -10.260000,-6.0 -7.5,-6.0 C -4.7400000,-6.0 -2.5,-3.7600000 -2.5,-1.0 z "/>
    </marker>`,

	"SquareL": `<marker style="overflow:visible" id="SquareL" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="SquareL">
      <path transform="scale(0.8)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M -5.0,-5.0 L -5.0,5.0 L 5.0,5.0 L 5.0,-5.0 L -5.0,-5.0 z "/>
    </marker>`,
	"SquareM": `<marker style="overflow:visible" id="SquareM" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="SquareM">
      <path transform="scale(0.4)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M -5.0,-5.0 L -5.0,5.0 L 5.0,5.0 L 5.0,-5.0 L -5.0,-5.0 z "/>
    </marker>`,
	"SquareS": `<marker style="overflow:visible" id="SquareS" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="SquareS">
      <path transform="scale(0.2)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M -5.0,-5.0 L -5.0,5.0 L 5.0,5.0 L 5.0,-5.0 L -5.0,-5.0 z "/>
    </marker>`,

	"DiamondL": `<marker style="overflow:visible" id="DiamondL" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="DiamondL">       
      <path transform="scale(0.8)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M 0,-7.0710768 L -7.0710894,0 L 0,7.0710589 L 7.0710462,0 L 0,-7.0710768 z "/>
    </marker>`,
	"DiamondM": `<marker style="overflow:visible" id="DiamondM" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="DiamondM">
      <path transform="scale(0.4)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M 0,-7.0710768 L -7.0710894,0 L 0,7.0710589 L 7.0710462,0 L 0,-7.0710768 z "/>
    </marker>`,
	"DiamondS": `<marker style="overflow:visible" id="DiamondS" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="DiamondS">
      <path transform="scale(0.2)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M 0,-7.0710768 L -7.0710894,0 L 0,7.0710589 L 7.0710462,0 L 0,-7.0710768 z "/>
    </marker>`,

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    </marker>`,

	"Club": `<marker style="overflow:visible" id="Club" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Club">
      <path transform="scale(0.6)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:0.74587913pt" d="M -1.5971367,-7.0977635 C -3.4863874,-7.0977635 -5.0235187,-5.5606321 -5.0235187,-3.6713813 C -5.0235187,-3.0147015 -4.7851656,-2.4444556 -4.4641095,-1.9232271 C -4.5028609,-1.8911157 -4.5437814,-1.8647646 -4.5806531,-1.8299921 C -5.2030765,-2.6849849 -6.1700514,-3.2751330 -7.3077730,-3.2751330 C -9.1970245,-3.2751331 -10.734155,-1.7380016 -10.734155,0.15124914 C -10.734155,2.0404999 -9.1970245,3.5776313 -7.3077730,3.5776313 C -6.3143268,3.5776313 -5.4391540,3.1355702 -4.8137404,2.4588126 C -4.9384274,2.8137041 -5.0235187,3.1803000 -5.0235187,3.5776313 C -5.0235187,5.4668819 -3.4863874,7.0040135 -1.5971367,7.0040135 C 0.29211394,7.0040135 1.8292454,5.4668819 1.8292454,3.5776313 C 1.8292454,2.7842354 1.5136868,2.0838028 1.0600576,1.5031550 C 2.4152718,1.7663868 3.7718375,2.2973711 4.7661444,3.8340272 C 4.0279463,3.0958289 3.5540908,1.7534117 3.5540908,-0.058529361 L 2.9247554,-0.10514681 L 3.5074733,-0.12845553 C 3.5074733,-1.9403966 3.9580199,-3.2828138 4.6962183,-4.0210121 C 3.7371277,-2.5387813 2.4390549,-1.9946496 1.1299838,-1.7134486 C 1.5341802,-2.2753578 1.8292454,-2.9268556 1.8292454,-3.6713813 C 1.8292454,-5.5606319 0.29211394,-7.0977635 -1.5971367,-7.0977635 z "/>
    </marker>`,

	"RazorWire": `<marker style="overflow:visible" orient="auto" refY="0" refX="0" id="RazorWire" inkscape:stockid="RazorWire">
      <path d="M 0.022727273,-0.74009011 L 0.022727273,0.69740989 L -7.7585227,3.0099099 L 10.678977,3.0099099 L 3.4914773,0.69740989 L 3.4914773,-0.74009011 L 10.741477,-2.8963401 L -7.7272727,-2.8963401 L 0.022727273,-0.74009011 z " style="fill:#808080;fill-opacity:1;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.1pt" transform="scale(0.8,0.8)"/>
    </marker>`,

	"InfiniteLineEnd": `<marker orient="auto" refY="0" refX="0" id="InfiniteLineEnd" inkscape:stockid="InfiniteLineEnd" style="overflow:visible">
      <g style="fill:context-stroke">
        <circle cx="3" cy="0" r="0.8"/>
        <circle cx="6.5" cy="0" r="0.8"/>
        <circle cx="10" cy="0" r="0.8"/>
      </g>
    </marker>`,
	"InfiniteLineStart": `<marker orient="auto" refY="0" refX="0" id="InfiniteLineStart" inkscape:stockid="InfiniteLineStart" style="overflow:visible">
      <g transform="translate(-13,0)" style="fill:context-stroke">
        <circle cx="3" cy="0" r="0.8"/>
        <circle cx="6.5" cy="0" r="0.8"/>
        <circle cx="10" cy="0" r="0.8"/>
      </g>
    </marker>`,
}

StandardMarkersMap is a map of the standard markers

View Source 
var StandardSizesMap = map[StandardSizes]*StandardSizeValues{
	Img1280x720:  {units.UnitPx, 1280, 720},
	Img1920x1080: {units.UnitPx, 1920, 1080},
	Img3840x2160: {units.UnitPx, 3840, 2160},
	Img7680x4320: {units.UnitPx, 7680, 4320},
	Img1024x768:  {units.UnitPx, 1024, 768},
	Img720x480:   {units.UnitPx, 720, 480},
	Img640x480:   {units.UnitPx, 640, 480},
	Img320x240:   {units.UnitPx, 320, 240},
	A4:           {units.UnitMm, 210, 297},
	USLetter:     {units.UnitPt, 612, 792},
	USLegal:      {units.UnitPt, 612, 1008},
	A0:           {units.UnitMm, 841, 1189},
	A1:           {units.UnitMm, 594, 841},
	A2:           {units.UnitMm, 420, 594},
	A3:           {units.UnitMm, 297, 420},
	A5:           {units.UnitMm, 148, 210},
	A6:           {units.UnitMm, 105, 148},
	A7:           {units.UnitMm, 74, 105},
	A8:           {units.UnitMm, 52, 74},
	A9:           {units.UnitMm, 37, 52},
	A10:          {units.UnitMm, 26, 37},
}

StandardSizesMap is the map of size values for each standard size

View Source 
var ToolHelpMap = map[Tools]string{
	SelectTool:  "Click to select items: keep clicking to go deeper",
	SelBoxTool:  "Drag a box to select elements within",
	NodeTool:    "Click to select a path to edit <b>Alt</b> = only move node, not control points, <b>Ctrl</b> = constrain to axis with smallest delta",
	RectTool:    "Drag to add a new rectangle <b>Ctrl</b> = constrain to axis with smallest delta",
	EllipseTool: "Drag to add a new ellipse <b>Ctrl</b> = constrain to axis with smallest delta",
	BezierTool:  "Click to add points (don't drag) <b>Alt</b> = add curve nodes, otherwise lines, <b>Enter</b> or click on same spot when done (Alt closes)",
}

ToolHelpMap contains a set of help strings for different tools.

Functions

func AddNewDash 

func AddNewDash(dary []float64) string

AddNewDash adds new dash pattern to available list, creating name based on pattern, which is returned. the given array is copied before storing, just in case.

func BBoxReshapeDelta 

func BBoxReshapeDelta(bb *math32.Box2, delta float32, bbX, bbY BBoxPoints)

BBoxReshapeDelta moves given target dimensions by delta amounts

func DashIconsInit 

func DashIconsInit()

DashIconsInit ensures that the dashes have been turned into icons for selectors, with same name (dash- prefix). Call this after startup, when configuring a gui element that needs it.

func DashMatchArray 

func DashMatchArray(lwidth float64, dary []float64) (bool, string)

DashMatchArray returns the matching dash pattern for given array and line width. divides array and matches with wide tolerance. returns true if no match and thus new dash pattern was added, else false.

func DashMulWidth 

func DashMulWidth(lwidth float64, dary []float64) []float64

DashMulWidth returns the dash array multiplied by the line width -- what is actually set

func DashString 

func DashString(dary []float64) string

DashString returns string of dash array values

func IconToMarkerName 

func IconToMarkerName(icnm any) string

IconToMarkerName converts a icons.Icon (as an interface{}) to a marker name suitable for use (removes marker- prefix)

func InactivateNodeCtrls added in v0.1.2 

func InactivateNodeCtrls(sprites *core.Sprites, i int)

func InactivateNodePoint added in v0.1.2 

func InactivateNodePoint(sprites *core.Sprites, i int)

func LayerIsLocked 

func LayerIsLocked(kn tree.Node) bool

LayerIsLocked returns true if layer is locked (insensitive = true)

func LayerIsVisible 

func LayerIsVisible(kn tree.Node) bool

LayerIsVisible returns true if layer is visible

func MarkerDeleteCtxtColors 

func MarkerDeleteCtxtColors(mk *svg.Marker)

MarkerDeleteCtxtColors deletes context-* color names from standard code

func MarkerIconsInit 

func MarkerIconsInit()

MarkerIconsInit ensures that the markers have been turned into icons for selectors, with marker- preix. Call this after startup, when configuring a gui element that needs it. It also initializes the AllMarkersSVGMap.

func MarkerNameToIcon 

func MarkerNameToIcon(nm string) icons.Icon

MarkerNameToIcon converts a marker name to a icons.Icon

func MarkerSetColors 

func MarkerSetColors(mk *svg.Marker, fill, stroke string)

MarkerSetColors sets color properties in each element

func MarkerSetProp 

func MarkerSetProp(sg *svg.SVG, sii svg.Node, prop, name string, mc MarkerColors)

MarkerSetProp sets marker property for given node to given marker name (canonical)

func MarkerUpdateColorProp 

func MarkerUpdateColorProp(sg *svg.SVG, sii svg.Node, prop string)

MarkerUpdateColorProp updates marker color for given marker property

func NewMarker 

func NewMarker(sg *svg.SVG, name string, id int) *svg.Marker

NewMarker makes a new marker of given name and id in given svg, copying from existing one in AllMarkersSVGMap.

func NewMarkerFromXML 

func NewMarkerFromXML(name, xml string) *svg.Marker

NewMarkerFromXML makes a new marker from given XML source.

func NewSVGElement 

func NewSVGElement[T tree.NodeValue](sv *SVG, useTree bool) *T

NewSVGElement makes a new SVG element of the given type. see [Canvas.NewParent] for the parent where it is made.

func NewSVGElementDrag 

func NewSVGElementDrag[T tree.NodeValue](sv *SVG, start, end image.Point) *T

NewSVGElementDrag makes a new SVG element of the given type during the drag operation.

func NodeIsLayer 

func NodeIsLayer(kn tree.Node) bool

NodeIsLayer returns true if given node is a layer

func NodeIsMetaData 

func NodeIsMetaData(kn tree.Node) bool

NodeIsMetaData returns true if given node is a MetaData

func NodeParentLayer 

func NodeParentLayer(n tree.Node) tree.Node

NodeParentLayer returns the parent group that is a layer -- nil if none

func OpacityFromColor added in v0.1.2 

func OpacityFromColor(img image.Image) float32

OpacityFromColor extracts the opacity as a 0-1 float from given uniform color-as-image.

func OpenPaths added in v0.1.2 

func OpenPaths()

OpenPaths loads the active SavedPaths from settings dir

func OpenSplits added in v0.1.2 

func OpenSplits()

OpenSplits opens last saved splits from settings file.

func ProportionalBBox 

func ProportionalBBox(bb, orig math32.Box2) math32.Box2

func RecycleMarker 

func RecycleMarker(sg *svg.SVG, sii svg.Node, name string, id int, mc MarkerColors) *svg.Marker

RecycleMarker ensures that given marker name and id exists in SVG, making a new one, copying from standard markers if not. if mc is MarkerCopyColor then sets marker colors to node colors.

func SavePaths added in v0.1.2 

func SavePaths()

SavePaths saves the active SavedPaths to settings dir

func SaveSplits added in v0.1.2 

func SaveSplits()

SaveSplits saves named splits to a json-formatted file.

func SetSpriteProperties 

func SetSpriteProperties(sp *core.Sprite, typ, subtyp Sprites, idx int)

SetSpriteProperties sets sprite properties

func SnapToIncr 

func SnapToIncr(val, off, incr float32) float32

SnapToIncr snaps value to given increment, first subtracting given offset. Tolerance is determined by settings, which is in screen pixels. Returns true if snapped.

func SnapToPoint added in v0.1.2 

func SnapToPoint(val, snap float32) (float32, bool)

SnapToPoint snaps value to given potential snap point, in screen pixel units. Tolerance is determined by settings. Returns true if snapped.

func SpriteByName 

func SpriteByName(ctx core.Widget, typ, subtyp Sprites, idx int) (*core.Sprite, bool)

SpriteByName returns the given sprite in the context of the given widget, returning nil, false if not yet made.

func SpriteName 

func SpriteName(typ, subtyp Sprites, idx int) string

SpriteName returns the unique name of the sprite based on main type, subtype (e.g., bbox) if relevant, and index if relevant

func SquareBBox 

func SquareBBox(bb math32.Box2) math32.Box2

func ToolDoesBasicSelect 

func ToolDoesBasicSelect(tl Tools) bool

ToolDoesBasicSelect returns true if tool should do select for clicks

Types

type Actions 

type Actions int32 //enums:enum

const (
	NoAction Actions = iota
	Move
	Reshape
	Rotate
	BoxSelect
	SetStrokeColor
	SetFillColor
	SetOpacity
	NewElement
	NewText
	NewPath
	NodeMove
	CtrlMove
)
const ActionsN Actions = 13

ActionsN is the highest valid value for type Actions, plus one.

func ActionsValues 

func ActionsValues() []Actions

ActionsValues returns all possible values for the type Actions.

func (Actions) Desc 

func (i Actions) Desc() string

Desc returns the description of the Actions value.

func (Actions) Int64 

func (i Actions) Int64() int64

Int64 returns the Actions value as an int64.

func (Actions) MarshalText 

func (i Actions) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*Actions) SetInt64 

func (i *Actions) SetInt64(in int64)

SetInt64 sets the Actions value from an int64.

func (*Actions) SetString 

func (i *Actions) SetString(s string) error

SetString sets the Actions value from its string representation, and returns an error if the string is invalid.

func (Actions) String 

func (i Actions) String() string

String returns the string representation of this Actions value.

func (*Actions) UnmarshalText 

func (i *Actions) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (Actions) Values 

func (i Actions) Values() []enums.Enum

Values returns all possible values for the type Actions.

type AlignAnchors 

type AlignAnchors int32 //enums:enum

AlignAnchors are ways of anchoring alignment 

const (
	AlignFirst AlignAnchors = iota
	AlignLast
	AlignDrawing
	AlignSelectBox
)
const AlignAnchorsN AlignAnchors = 4

AlignAnchorsN is the highest valid value for type AlignAnchors, plus one.

func AlignAnchorsValues 

func AlignAnchorsValues() []AlignAnchors

AlignAnchorsValues returns all possible values for the type AlignAnchors.

func (AlignAnchors) Desc 

func (i AlignAnchors) Desc() string

Desc returns the description of the AlignAnchors value.

func (AlignAnchors) Int64 

func (i AlignAnchors) Int64() int64

Int64 returns the AlignAnchors value as an int64.

func (AlignAnchors) MarshalText 

func (i AlignAnchors) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*AlignAnchors) SetInt64 

func (i *AlignAnchors) SetInt64(in int64)

SetInt64 sets the AlignAnchors value from an int64.

func (*AlignAnchors) SetString 

func (i *AlignAnchors) SetString(s string) error

SetString sets the AlignAnchors value from its string representation, and returns an error if the string is invalid.

func (AlignAnchors) String 

func (i AlignAnchors) String() string

String returns the string representation of this AlignAnchors value.

func (*AlignAnchors) UnmarshalText 

func (i *AlignAnchors) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (AlignAnchors) Values 

func (i AlignAnchors) Values() []enums.Enum

Values returns all possible values for the type AlignAnchors.

type AlignView 

type AlignView struct {
	core.Frame

	// Anchor is the alignment anchor
	Anchor AlignAnchors

	// the parent [Canvas]
	Canvas *Canvas `copier:"-" json:"-" xml:"-" display:"-"`
}

AlignView provides a range of alignment actions on selected objects.

func NewAlignView 

func NewAlignView(parent ...tree.Node) *AlignView

NewAlignView returns a new AlignView with the given optional parent: AlignView provides a range of alignment actions on selected objects.

func (*AlignView) Init 

func (av *AlignView) Init()

func (*AlignView) SetAnchor 

func (t *AlignView) SetAnchor(v AlignAnchors) *AlignView

SetAnchor sets the [AlignView.Anchor]: Anchor is the alignment anchor

func (*AlignView) SetCanvas 

func (t *AlignView) SetCanvas(v *Canvas) *AlignView

SetCanvas sets the [AlignView.Canvas]: the parent Canvas

type Aligns 

type Aligns int32 //enums:enum -transform kebab

Aligns are ways of aligning items 

const (
	// align right edges to left edge of anchor item
	AlignRightAnchor Aligns = iota

	// align left edges
	AlignLeft

	// align horizontal centers
	AlignCenter

	// align right edges
	AlignRight

	// align left edges to right edge of anchor item
	AlignLeftAnchor

	// align left text baseline edges
	AlignBaselineHoriz

	// align bottom edges to top edge of anchor item
	AlignBottomAnchor

	// align top edges
	AlignTop

	// align middle vertical point
	AlignMiddle

	// align bottom edges
	AlignBottom

	// align top edges to bottom edge of anchor item
	AlignTopAnchor

	// align baseline points vertically
	AlignBaselineVert
)
const AlignsN Aligns = 12

AlignsN is the highest valid value for type Aligns, plus one.

func AlignsValues 

func AlignsValues() []Aligns

AlignsValues returns all possible values for the type Aligns.

func (Aligns) Desc 

func (i Aligns) Desc() string

Desc returns the description of the Aligns value.

func (Aligns) Int64 

func (i Aligns) Int64() int64

Int64 returns the Aligns value as an int64.

func (Aligns) MarshalText 

func (i Aligns) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*Aligns) SetInt64 

func (i *Aligns) SetInt64(in int64)

SetInt64 sets the Aligns value from an int64.

func (*Aligns) SetString 

func (i *Aligns) SetString(s string) error

SetString sets the Aligns value from its string representation, and returns an error if the string is invalid.

func (Aligns) String 

func (i Aligns) String() string

String returns the string representation of this Aligns value.

func (*Aligns) UnmarshalText 

func (i *Aligns) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (Aligns) Values 

func (i Aligns) Values() []enums.Enum

Values returns all possible values for the type Aligns.

type BBoxPoints 

type BBoxPoints int32 //enums:enum

BBoxPoints are the different control points within a bounding box 

const (
	BBLeft BBoxPoints = iota
	BBCenter
	BBRight
	BBTop
	BBMiddle
	BBBottom
)
const BBoxPointsN BBoxPoints = 6

BBoxPointsN is the highest valid value for type BBoxPoints, plus one.

func BBoxPointsValues 

func BBoxPointsValues() []BBoxPoints

BBoxPointsValues returns all possible values for the type BBoxPoints.

func ReshapeBBoxPoints 

func ReshapeBBoxPoints(reshape Sprites) (bbX, bbY BBoxPoints)

ReshapeBBoxPoints returns the X and Y BBoxPoints for given sprite Reshape control point.

func (BBoxPoints) Desc 

func (i BBoxPoints) Desc() string

Desc returns the description of the BBoxPoints value.

func (BBoxPoints) Dim 

func (ev BBoxPoints) Dim() math32.Dims

Dim returns the relevant dimension for this point

func (BBoxPoints) Int64 

func (i BBoxPoints) Int64() int64

Int64 returns the BBoxPoints value as an int64.

func (BBoxPoints) MarshalText 

func (i BBoxPoints) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (BBoxPoints) MoveDelta 

func (ev BBoxPoints) MoveDelta(bb *math32.Box2, delta float32)

MoveDelta moves overall bbox (Max and Min) by delta (X or Y depending on pt)

func (BBoxPoints) PointBox 

func (ev BBoxPoints) PointBox(bb math32.Box2) math32.Vector2

PointBox returns the relevant point for a given bounding box, where relevant dimension is from ValRect and other is midpoint -- for drawing lines.

func (*BBoxPoints) SetInt64 

func (i *BBoxPoints) SetInt64(in int64)

SetInt64 sets the BBoxPoints value from an int64.

func (*BBoxPoints) SetString 

func (i *BBoxPoints) SetString(s string) error

SetString sets the BBoxPoints value from its string representation, and returns an error if the string is invalid.

func (BBoxPoints) SetValueBox 

func (ev BBoxPoints) SetValueBox(bb *math32.Box2, val float32)

SetValueBox sets the relevant value for a given bounding box as a math32.Box2

func (BBoxPoints) String 

func (i BBoxPoints) String() string

String returns the string representation of this BBoxPoints value.

func (*BBoxPoints) UnmarshalText 

func (i *BBoxPoints) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (BBoxPoints) ValueBox 

func (ev BBoxPoints) ValueBox(bb math32.Box2) float32

ValueBox returns the relevant value for a given bounding box as a math32.Box2

func (BBoxPoints) Values 

func (i BBoxPoints) Values() []enums.Enum

Values returns all possible values for the type BBoxPoints.

type Canvas 

type Canvas struct {
	core.Frame

	// full path to current drawing filename
	Filename core.Filename `extension:".svg" set:"-"`

	// current edit state
	EditState EditState `set:"-"`

	// SVG displays the SVG image and has methods for managing it.
	SVG *SVG
	// contains filtered or unexported fields
}

Canvas is the main widget of the Cogent Canvas SVG vector graphics program.

func NewCanvas 

func NewCanvas(parent ...tree.Node) *Canvas

NewCanvas returns a new Canvas with the given optional parent: Canvas is the main widget of the Cogent Canvas SVG vector graphics program.

func NewDrawing 

func NewDrawing(sz PhysicalSize) *Canvas

NewDrawing opens a new drawing window

func NewWindow 

func NewWindow(fnm string) *Canvas

NewWindow returns a new Canvas in a new window loading given file if non-empty.

func (*Canvas) AddImage 

func (cv *Canvas) AddImage(fname core.Filename, width, height float32) error

AddImage adds a new image node set to the given image

func (*Canvas) AddLayer 

func (cv *Canvas) AddLayer()

AddLayer adds a new layer

func (*Canvas) AnySelectedNodes added in v0.1.2 

func (cv *Canvas) AnySelectedNodes() []svg.Node

AnySelectedNodes returns svg nodes that are selected in the svg tree (first) or selected in the SVG drawing (second), as svg Nodes. This is useful for contextualizing tree actions (e.g., NewGroup).

func (*Canvas) Autosave added in v0.1.2 

func (cv *Canvas) Autosave() error

Autosave does the autosave -- safe to call in a separate goroutine

func (*Canvas) AutosaveCheck added in v0.1.2 

func (cv *Canvas) AutosaveCheck(fnm core.Filename) bool

AutosaveCheck checks if an autosave file exists.

func (*Canvas) AutosaveDelete added in v0.1.2 

func (cv *Canvas) AutosaveDelete()

AutosaveDelete deletes any existing autosave file

func (*Canvas) ChangeMade 

func (cv *Canvas) ChangeMade()

ChangeMade should be called after any change is completed on the drawing. Calls autosave.

func (*Canvas) ClearCurLayer 

func (cv *Canvas) ClearCurLayer(lay string)

ClearCurLayer clears the current layer for creating items if it was set to the given layer name

func (*Canvas) CopySelected 

func (cv *Canvas) CopySelected()

CopySelected copies selected items in SVG view, using Tree methods.

func (*Canvas) CutSelected 

func (cv *Canvas) CutSelected()

CutSelected cuts selected items in SVG view, using Tree methods.

func (*Canvas) DefaultGradient 

func (cv *Canvas) DefaultGradient() string

DefaultGradient returns the default gradient to use for setting stops

func (*Canvas) DeleteItems added in v0.1.2 

func (cv *Canvas) DeleteItems(nd ...svg.Node)

DeleteItems deletes the given svg.Node item(s) using Tree methods.

func (*Canvas) DeleteSelected 

func (cv *Canvas) DeleteSelected()

DeleteSelected deletes selected items in SVG view, using Tree methods

func (*Canvas) DuplicateSelected 

func (cv *Canvas) DuplicateSelected()

DuplicateSelected duplicates selected items in SVG view, using Tree methods

func (*Canvas) EditRecentPaths added in v0.1.2 

func (cv *Canvas) EditRecentPaths()

EditRecentPaths opens a dialog editor for editing the recent project paths list

func (*Canvas) ExportPDF 

func (cv *Canvas) ExportPDF(dpi float32, inkscape bool) error

ExportPDF exports drawing to a PDF file (auto-names to same name with .pdf suffix). Uses native PDF rendering or optionally calls inkscape from the command line -- needs to be on the PATH. specify DPI of resulting image for effects rendering. Renders full current page -- do ResizeToContents to render just current contents.

func (*Canvas) ExportPDFInkscape added in v0.1.3 

func (cv *Canvas) ExportPDFInkscape(dpi float32) error

func (*Canvas) ExportPNG 

func (cv *Canvas) ExportPNG(width, height float32) error

ExportPNG exports drawing to a PNG image (auto-names to same name with .png suffix). Specify either width or height of resulting image, or nothing for physical size as set. Renders full current page: Do Size/Resize to contents to render just current contents.

func (*Canvas) FirstLayerIndex 

func (cv *Canvas) FirstLayerIndex() int

FirstLayerIndex returns index of first layer group in svg

func (*Canvas) HelpWiki 

func (cv *Canvas) HelpWiki()

HelpWiki opens wiki page for grid on github

func (*Canvas) Init 

func (cv *Canvas) Init()

func (*Canvas) InsertBreak added in v0.1.2 

func (cv *Canvas) InsertBreak()

InsertBreak inserts a break (move) into current active path: If no selection: at end, otherwise after first selected node.

func (*Canvas) InsertCubicNode added in v0.1.2 

func (cv *Canvas) InsertCubicNode()

InsertCubicNode inserts a cubic node into current active path: If no selection: at end, otherwise after first selected node.

func (*Canvas) InsertLineNode added in v0.1.2 

func (cv *Canvas) InsertLineNode()

InsertLineNode inserts a LineTo node into current active path: If no selection: at end, otherwise after first selected node.

func (*Canvas) IsCurLayer 

func (cv *Canvas) IsCurLayer(lay string) bool

IsCurLayer returns true if given layer is the current layer for creating items

func (*Canvas) ItemsAsTrees added in v0.1.2 

func (cv *Canvas) ItemsAsTrees(nd ...svg.Node) []core.Treer

ItemsAsTrees returns the list of SVG items as Tree nodes.

func (*Canvas) MakeNodeToolbar 

func (cv *Canvas) MakeNodeToolbar(p *tree.Plan)

func (*Canvas) MakeSelectToolbar 

func (cv *Canvas) MakeSelectToolbar(p *tree.Plan)

MakeSelectToolbar adds the select toolbar to the given plan.

func (*Canvas) MakeTextToolbar 

func (cv *Canvas) MakeTextToolbar(p *tree.Plan)

func (*Canvas) MakeToolbar 

func (cv *Canvas) MakeToolbar(p *tree.Plan)

func (*Canvas) MakeTools 

func (cv *Canvas) MakeTools(p *tree.Plan)

func (*Canvas) NewDrawing 

func (cv *Canvas) NewDrawing(sz PhysicalSize) *Canvas

NewDrawing creates a new drawing of the given size

func (*Canvas) NodeDelete added in v0.1.2 

func (cv *Canvas) NodeDelete()

NodeDelete deletes the selected node(s) from current active path.

func (*Canvas) NodeInsert added in v0.1.2 

func (cv *Canvas) NodeInsert(ntyp Sprites)

NodeInsert inserts a node of given type into current active path: If no selection: at end, otherwise after first selected node.

func (*Canvas) NodeReplace added in v0.1.2 

func (cv *Canvas) NodeReplace(ntyp Sprites)

NodeReplace replaces current node with new one of given type into current active path.

func (*Canvas) NodeReplaceCubic added in v0.1.2 

func (cv *Canvas) NodeReplaceCubic()

NodeReplaceCubic replaces selected non-cubic nodes with cubic ones into current active path

func (*Canvas) OpenDrawing 

func (cv *Canvas) OpenDrawing(fnm core.Filename) error

OpenDrawing opens a new .svg drawing

func (*Canvas) OpenDrawingCheck added in v0.1.2 

func (cv *Canvas) OpenDrawingCheck(fnm core.Filename) error

OpenDrawingCheck opens a new .svg drawing, checking for autosave file.

func (*Canvas) OpenDrawingFile 

func (cv *Canvas) OpenDrawingFile(fnm core.Filename) error

OpenDrawingFile opens a new .svg drawing file -- just the basic opening

func (*Canvas) PaintSetter added in v0.1.2 

func (cv *Canvas) PaintSetter() *PaintSetter

func (*Canvas) PasteAvailFunc 

func (cv *Canvas) PasteAvailFunc(bt *core.Button)

PasteAvailFunc is an ActionUpdateFunc that inactivates action if no paste avail

func (*Canvas) PasteClip 

func (cv *Canvas) PasteClip()

PasteClip pastes clipboard, using cur layer etc

func (*Canvas) PromptPhysicalSize added in v0.1.2 

func (cv *Canvas) PromptPhysicalSize()

PromptPhysicalSize prompts for the physical size of the drawing and sets it

func (*Canvas) Redo 

func (cv *Canvas) Redo() string

Redo redoes the previously undone action

func (*Canvas) ResizeToContents 

func (cv *Canvas) ResizeToContents()

ResizeToContents resizes the drawing to just fit the current contents, including moving everything to start at upper-left corner, preserving the current grid offset, so grid snapping is preserved.

func (*Canvas) SSVG 

func (cv *Canvas) SSVG() *svg.SVG

SSVG returns the underlying svg.SVG.

func (*Canvas) SaveDrawing 

func (cv *Canvas) SaveDrawing() error

SaveDrawing saves .svg drawing to current filename

func (*Canvas) SaveDrawingAs 

func (cv *Canvas) SaveDrawingAs(fname core.Filename) error

SaveDrawingAs saves .svg drawing to given filename

func (*Canvas) SelectFlipHorizontal 

func (cv *Canvas) SelectFlipHorizontal()

SelectFlipHorizontal flips the selection horizontally

func (*Canvas) SelectFlipVertical 

func (cv *Canvas) SelectFlipVertical()

SelectFlipVertical flips the selection vertically

func (*Canvas) SelectGroup 

func (cv *Canvas) SelectGroup()

SelectGroup groups items together

func (*Canvas) SelectLower 

func (cv *Canvas) SelectLower()

SelectLower lowers the selection by one level in the layer

func (*Canvas) SelectLowerBottom 

func (cv *Canvas) SelectLowerBottom()

SelectLowerBottom lowers the selection to the bottom of the layer

func (*Canvas) SelectNodeInSVG 

func (cv *Canvas) SelectNodeInSVG(kn tree.Node, mode events.SelectModes)

SelectNodeInSVG selects given svg node in SVG drawing

func (*Canvas) SelectNodeInTree 

func (cv *Canvas) SelectNodeInTree(nd tree.Node, mode events.SelectModes)

SelectNodeInTree selects given node in Tree

func (*Canvas) SelectRaise 

func (cv *Canvas) SelectRaise()

SelectRaise raises the selection by one level in the layer

func (*Canvas) SelectRaiseTop 

func (cv *Canvas) SelectRaiseTop()

SelectRaiseTop raises the selection to the top of the layer

func (*Canvas) SelectRotate 

func (cv *Canvas) SelectRotate(deg float32)

func (*Canvas) SelectRotateLeft 

func (cv *Canvas) SelectRotateLeft()

SelectRotateLeft rotates the selection 90 degrees counter-clockwise

func (*Canvas) SelectRotateRight 

func (cv *Canvas) SelectRotateRight()

SelectRotateRight rotates the selection 90 degrees clockwise

func (*Canvas) SelectScale 

func (cv *Canvas) SelectScale(scx, scy float32)

func (*Canvas) SelectSetHeight 

func (cv *Canvas) SelectSetHeight(ht float32)

func (*Canvas) SelectSetWidth 

func (cv *Canvas) SelectSetWidth(wd float32)

func (*Canvas) SelectSetXPos 

func (cv *Canvas) SelectSetXPos(xp float32)

func (*Canvas) SelectSetYPos 

func (cv *Canvas) SelectSetYPos(yp float32)

func (*Canvas) SelectUnGroup 

func (cv *Canvas) SelectUnGroup()

SelectUnGroup ungroups items from each other

func (*Canvas) SelectedAsTrees 

func (cv *Canvas) SelectedAsTrees() []core.Treer

SelectedAsTrees returns the currently selected items from SVG as Tree nodes.

func (*Canvas) SetCurLayer 

func (cv *Canvas) SetCurLayer(lay string)

SetCurLayer sets the current layer for creating items to given one

func (*Canvas) SetDashProperties 

func (cv *Canvas) SetDashProperties(dary []float64)

SetDashNode sets the stroke-dasharray property of Node. multiplies dash values by the line width in dots.

func (*Canvas) SetFillColor 

func (cv *Canvas) SetFillColor(fp string, final bool)

SetFillColor sets the fill color for selected items, which can be done dynamically (for events.Input events, final = false, followed by a final events.Change event (final = true)

func (*Canvas) SetFillProperty added in v0.1.2 

func (cv *Canvas) SetFillProperty(prop, wp string)

SetFillProperty sets given property only if fill.color is non-nil.

func (*Canvas) SetMarkerProperties 

func (cv *Canvas) SetMarkerProperties(start, mid, end string, sc, mc, ec MarkerColors)

SetMarkerProperties sets the marker properties

func (*Canvas) SetOpacity added in v0.1.2 

func (cv *Canvas) SetOpacity(sp string, final bool)

SetOpacity sets the global opacity for selected items. which can be done dynamically (for events.Input events, final = false, followed by a final events.Change event (final = true)

func (*Canvas) SetPhysicalSize added in v0.1.2 

func (cv *Canvas) SetPhysicalSize(sz *PhysicalSize)

SetPhysicalSize sets physical size of drawing

func (*Canvas) SetSVG added in v0.1.2 

func (t *Canvas) SetSVG(v *SVG) *Canvas

SetSVG sets the [Canvas.SVG]: SVG displays the SVG image and has methods for managing it.

func (*Canvas) SetStatus 

func (cv *Canvas) SetStatus(msg string)

SetStatus updates the status bar text with the given message, along with other status info

func (*Canvas) SetStrokeColor 

func (cv *Canvas) SetStrokeColor(sp string, final bool)

SetStrokeColor sets the stroke color for selected items. which can be done dynamically (for events.Input events, final = false, followed by a final events.Change event (final = true)

func (*Canvas) SetStrokeProperty added in v0.1.2 

func (cv *Canvas) SetStrokeProperty(prop, wp string)

SetStrokeProperty sets given property only if stroke.color is non-nil.

func (*Canvas) SetText 

func (cv *Canvas) SetText(txt string)

SetText sets the text of selected Text node

func (*Canvas) SetTextNode 

func (cv *Canvas) SetTextNode(sii svg.Node, txt string) bool

SetTextNode sets the text of given Text node

func (*Canvas) SetTextProperties 

func (cv *Canvas) SetTextProperties(tps map[string]any)

SetTextProperties sets the text properties of selected Text nodes.

func (*Canvas) SetTitle 

func (cv *Canvas) SetTitle()

func (*Canvas) SetTool 

func (cv *Canvas) SetTool(tl Tools)

SetTool sets the current active tool

func (*Canvas) StatusText 

func (cv *Canvas) StatusText() *core.Text

StatusText returns the status bar text widget

func (*Canvas) SyncLayers 

func (cv *Canvas) SyncLayers()

Synchronizes layer list with current SVG structure: use the tree editor to rearrange layers, and then hit this button to update the layer list here.

func (*Canvas) SyncLayersFromSVG added in v0.1.2 

func (cv *Canvas) SyncLayersFromSVG()

func (*Canvas) Tab 

func (gv *Canvas) Tab(name string) *core.Frame

Tab returns the tab with the given name

func (*Canvas) Undo 

func (cv *Canvas) Undo() string

Undo undoes the last action

func (*Canvas) UpdateAll 

func (cv *Canvas) UpdateAll()

UpdateAll updates the display

func (*Canvas) UpdateGradients 

func (cv *Canvas) UpdateGradients()

UpdateGradients updates gradients from EditState

func (*Canvas) UpdateLayers added in v0.1.2 

func (cv *Canvas) UpdateLayers()

func (*Canvas) UpdateMarkerColors 

func (cv *Canvas) UpdateMarkerColors(nd svg.Node)

UpdateMarkerColors updates the marker colors, when setting fill or stroke

func (*Canvas) UpdateModalToolbar added in v0.1.2 

func (cv *Canvas) UpdateModalToolbar()

UpdateSelectIsText updates the SelectIsText status

func (*Canvas) UpdateSVG added in v0.1.2 

func (cv *Canvas) UpdateSVG()

func (*Canvas) UpdateTabs 

func (cv *Canvas) UpdateTabs()

func (*Canvas) UpdateText added in v0.1.2 

func (cv *Canvas) UpdateText()

func (*Canvas) UpdateTree 

func (cv *Canvas) UpdateTree()

type EditState 

type EditState struct {

	// current tool in use
	Tool Tools

	// current action being performed, for undo labeling
	Action Actions

	// action data set at start of action
	ActData string

	// list of layers
	Layers Layers

	// current layer -- where new objects are inserted
	CurLayer string

	// current shared gradients, referenced by obj-specific gradients
	Gradients []*Gradient

	// current text styling info
	Text TextStyle

	// the undo manager
	Undos undo.Stack

	// contents have changed
	Changed bool `display:"inactive"`

	// action mutex, protecting start / end of actions
	ActMu sync.Mutex `copier:"-" json:"-" xml:"-" display:"-"`

	// selected item(s)
	Selected map[svg.Node]*SelectedState `copier:"-" json:"-" xml:"-" display:"-"`

	// selection just happened on press, and no drag happened in between
	SelectNoDrag bool

	// MouseDownSel is selected object from the mouse down event,
	// which is carried over to the mouse up event to adjudicate between drag and select.
	MouseDownSel svg.Node

	// true if a new text item was made while dragging
	NewTextMade bool

	// point where dragging started
	DragStartPos image.Point

	// current dragging position
	DragPos image.Point

	// current dragging position, which is snapped if SnapNodes is on.
	DragSnapPos math32.Vector2

	// whether to constrain the current point if ctrl key is down.
	ConstrainPoint bool

	// current selection bounding box
	SelectBBox math32.Box2

	// number of current selectbox sprites
	NSelectSprites int

	// last select action position -- continued clicks in same area lead to deeper selection
	LastSelectPos image.Point

	// recently selected item(s) -- within the same selection position
	RecentlySelected map[svg.Node]*SelectedState `copier:"-" json:"-" xml:"-" display:"-"`

	// SelectIsText is true if the current selection is a single text item
	SelectIsText bool

	// bbox at start of dragging
	DragStartBBox math32.Box2

	// current bbox during dragging -- non-snapped version
	DragBBox math32.Box2

	// current effective bbox during dragging -- snapped version
	DragSnapBBox math32.Box2

	// potential points of alignment for dragging
	AlignPoints [BBoxPointsN][]math32.Vector2

	// number of current node sprites in use
	NNodeSprites int

	// currently manipulating path object
	ActivePath *svg.Path

	// current path node points
	PathNodes []*PathNode

	// original, pre-manipulation copy of current path node points
	PathNodesOrig []*PathNode

	// selected path nodes
	NodeSelect map[int]struct{}

	// current hover targets
	NodeHover, CtrlHover int
	CtrlHoverType        Sprites

	// Current control being dragged
	CtrlDragIndex int
	CtrlDrag      Sprites

	// Current position while drawing
	DrawPos image.Point

	// Current position while drawing, snapped
	DrawSnapPos image.Point

	// Starting position for drawing: first point in line
	DrawStartPos image.Point

	// the parent [Canvas]
	Canvas *Canvas `copier:"-" json:"-" xml:"-" display:"-"`
}

EditState has all the current edit state information

func (*EditState) ActDone 

func (es *EditState) ActDone()

ActDone finishes an action, resetting action

func (*EditState) ActStart 

func (es *EditState) ActStart(act Actions, data string)

ActStart starts an action, locking the mutex so only one can start

func (*EditState) ActUnlock 

func (es *EditState) ActUnlock()

ActUnlock unlocks the action mutex -- after done doing all action starting steps

func (*EditState) ConfigDefaultGradient 

func (es *EditState) ConfigDefaultGradient()

ConfigDefaultGradient configures a new default gradient

func (*EditState) DragCtrlStart added in v0.1.2 

func (es *EditState) DragCtrlStart(pos image.Point, idx int, ptyp Sprites)

DragCtrlStart captures the current state at start of control point dragging. position is starting position.

func (*EditState) DragNodeStart 

func (es *EditState) DragNodeStart(pos image.Point)

DragNodeStart captures the current state at start of node dragging. position is starting position.

func (*EditState) DragReset 

func (es *EditState) DragReset()

DragReset resets drag state information

func (*EditState) DragSelStart 

func (es *EditState) DragSelStart(pos image.Point)

DragSelStart captures the current state at start of dragging manipulation with selected items. position is starting position.

func (*EditState) FirstSelected added in v0.1.2 

func (es *EditState) FirstSelected() svg.Node

FirstSelected returns the first selected node of any type.

func (*EditState) FirstSelectedNode 

func (es *EditState) FirstSelectedNode() svg.Node

FirstSelectedNode returns the first selected node, that is not a Group (recurses into groups)

func (*EditState) FirstSelectedPath 

func (es *EditState) FirstSelectedPath() *svg.Path

FirstSelectedPath returns the first selected Path, that is not a Group (recurses into groups)

func (*EditState) HasNodeSelected added in v0.1.2 

func (es *EditState) HasNodeSelected() bool

func (*EditState) HasSelected 

func (es *EditState) HasSelected() bool

HasSelected returns true if there are selected items

func (*EditState) InAction 

func (es *EditState) InAction() bool

InAction reports whether we currently doing an action

func (*EditState) Init 

func (es *EditState) Init(cv *Canvas)

Init initializes the edit state -- e.g. after opening a new file

func (*EditState) IsSelected 

func (es *EditState) IsSelected(itm svg.Node) bool

IsSelected returns the selected status of given slice index

func (*EditState) NewRecents 

func (es *EditState) NewRecents()

func (*EditState) NewSelected 

func (es *EditState) NewSelected()

NewSelected makes a new Selected list

func (*EditState) NodeIsSelected added in v0.1.2 

func (es *EditState) NodeIsSelected(i int) bool

func (*EditState) NodeSelectAction added in v0.1.2 

func (es *EditState) NodeSelectAction(idx int, mode events.SelectModes)

NodeSelectAction is called when a select action has been received (e.g., a mouse click) -- translates into selection updates -- gets selection mode from mouse event (ExtendContinuous, ExtendOne)

func (*EditState) NodeSelectedList added in v0.1.2 

func (es *EditState) NodeSelectedList() []int

NodeSelectedList returns list of selected nodes in ascending index order.

func (*EditState) PosInLastSelect 

func (es *EditState) PosInLastSelect(pos image.Point) bool

PosInLastSelect returns true if position is within tolerance of last selection point

func (*EditState) ResetSelected 

func (es *EditState) ResetSelected()

ResetSelected resets the selection list, including recents

func (*EditState) ResetSelectedNodes added in v0.1.2 

func (es *EditState) ResetSelectedNodes()

func (*EditState) SanitizeSelected 

func (es *EditState) SanitizeSelected()

SanitizeSelected ensures that the current selected list makes sense. E.g., it prevents having a group and a child both in the selected list (removes the parent group).

func (*EditState) Select 

func (es *EditState) Select(itm svg.Node)

Select selects given item (if not already selected) -- updates select status of index text

func (*EditState) SelectAction 

func (es *EditState) SelectAction(n svg.Node, mode events.SelectModes, pos image.Point)

SelectAction is called when a select action has been received (e.g., a mouse click) -- translates into selection updates -- gets selection mode from mouse event (ExtendContinuous, ExtendOne)

func (*EditState) SelectNode added in v0.1.2 

func (es *EditState) SelectNode(i int)

func (*EditState) SelectedList 

func (es *EditState) SelectedList(descendingSort bool) []svg.Node

SelectedList returns list of selected items, sorted either ascending or descending according to order of selection

func (*EditState) SelectedListDepth 

func (es *EditState) SelectedListDepth(sv *SVG, descendingSort bool) []svg.Node

SelectedListDepth returns list of selected items, sorted either ascending or descending according to depth: ascending = deepest first, descending = highest first

func (*EditState) SelectedNames 

func (es *EditState) SelectedNames() []string

SelectedNames returns names of selected items, in order selected

func (*EditState) SelectedNamesString 

func (es *EditState) SelectedNamesString() string

SelectedNamesString returns names of selected items as a space-separated single string. If over 256 chars long, then truncated.

func (*EditState) SelectedToRecents 

func (es *EditState) SelectedToRecents()

func (*EditState) StartRecents 

func (es *EditState) StartRecents(pos image.Point)

StartRecents starts a new list of recently selected items

func (*EditState) Unselect 

func (es *EditState) Unselect(itm svg.Node)

Unselect unselects given idx (if selected)

func (*EditState) UnselectNode added in v0.1.2 

func (es *EditState) UnselectNode(i int)

func (*EditState) UpdateSelectBBox 

func (es *EditState) UpdateSelectBBox()

UpdateSelectBBox updates the current selection bbox surrounding all selected items

func (*EditState) UpdateSelectIsText added in v0.1.2 

func (es *EditState) UpdateSelectIsText()

UpdateSelectIsText updates the SelectIsText state.

type Gradient 

type Gradient struct {

	// Icon of gradient, auto generated to display each gradient.
	Icon icons.Icon `edit:"-" table:"no-header" icon-width:"4"`

	// ID is the name of gradient.
	ID string `edit:"-" width:"6"`

	// Name is the full name of gradient as SVG element.
	Name string `display:"-"`

	// Stops are the gradient stops.
	Stops []gradient.Stop `new-window:"+"`
}

Gradient represents a single gradient that defines stops (referenced in StopName of other gradients).

func (*Gradient) ConfigDefaultStops added in v0.1.2 

func (gr *Gradient) ConfigDefaultStops()

ConfigDefaultStops configures a new default gradient stops.

func (*Gradient) UpdateFromGrad added in v0.1.2 

func (gr *Gradient) UpdateFromGrad(g *svg.Gradient)

Updates our gradient from svg gradient

func (*Gradient) UpdateIcon 

func (gr *Gradient) UpdateIcon()

UpdateIcon updates icon

func (*Gradient) UpdateToGrad added in v0.1.2 

func (gr *Gradient) UpdateToGrad(g *svg.Gradient)

UpdateToGrad updates svg gradient from our gradient.

func (*Gradient) Validate added in v0.1.2 

func (gr *Gradient) Validate()

type Layer 

type Layer struct {
	Name string

	// visiblity toggle
	Vis bool

	// lock toggle
	Lock bool
}

Layer represents one layer group

func (*Layer) FromNode 

func (l *Layer) FromNode(k tree.Node)

FromNode copies state / prop values from given node

func (*Layer) ToNode 

func (l *Layer) ToNode(n tree.Node)

ToNode copies state / prop values to given node

type Layers 

type Layers []*Layer

Layers is the list of all layers

func (*Layers) LayerIndexByName 

func (ly *Layers) LayerIndexByName(nm string) int

func (*Layers) SyncLayersFromSVG added in v0.1.2 

func (ly *Layers) SyncLayersFromSVG(sv *SVG)

func (*Layers) SyncLayersToSVG added in v0.1.2 

func (ly *Layers) SyncLayersToSVG(sv *SVG)

SyncLayersToSVG updates properties of layers based on our settings.

func (*Layers) UniqueNames added in v0.1.2 

func (ly *Layers) UniqueNames()

UniqueNames ensures that our layers have unique names.

type MarkerColors 

type MarkerColors int32 //enums:enum -trim-prefix Marker

MarkerColors are the drawing tools 

const (
	// use the default color of marker (typically black)
	MarkerDef MarkerColors = iota

	// copy color of object using marker (create separate marker object per element)
	MarkerCopy

	// marker has its own separate custom color
	MarkerCust
)
const MarkerColorsN MarkerColors = 3

MarkerColorsN is the highest valid value for type MarkerColors, plus one.

func MarkerColorsValues 

func MarkerColorsValues() []MarkerColors

MarkerColorsValues returns all possible values for the type MarkerColors.

func MarkerFromNodeProp 

func MarkerFromNodeProp(n tree.Node, prop string) (string, int, MarkerColors)

MarkerFromNodeProp returns the marker name (canonicalized -- no id) and id and color type

func (MarkerColors) Desc 

func (i MarkerColors) Desc() string

Desc returns the description of the MarkerColors value.

func (MarkerColors) Int64 

func (i MarkerColors) Int64() int64

Int64 returns the MarkerColors value as an int64.

func (MarkerColors) MarshalText 

func (i MarkerColors) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*MarkerColors) SetInt64 

func (i *MarkerColors) SetInt64(in int64)

SetInt64 sets the MarkerColors value from an int64.

func (*MarkerColors) SetString 

func (i *MarkerColors) SetString(s string) error

SetString sets the MarkerColors value from its string representation, and returns an error if the string is invalid.

func (MarkerColors) String 

func (i MarkerColors) String() string

String returns the string representation of this MarkerColors value.

func (*MarkerColors) UnmarshalText 

func (i *MarkerColors) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (MarkerColors) Values 

func (i MarkerColors) Values() []enums.Enum

Values returns all possible values for the type MarkerColors.

type PaintSetter added in v0.1.2 

type PaintSetter struct {
	core.Frame

	// Active styles
	PaintStyle styles.Paint

	// paint type for stroke
	StrokeType PaintTypes

	// name of gradient with stops
	StrokeStops string

	// paint type for fill
	FillType PaintTypes

	// name of gradient with stops
	FillStops string

	// the parent [Canvas]
	Canvas *Canvas `copier:"-" json:"-" xml:"-" display:"-"`
	// contains filtered or unexported fields
}

PaintSetter provides setting of basic Stroke and Fill painting parameters for selected items

func NewPaintSetter added in v0.1.2 

func NewPaintSetter(parent ...tree.Node) *PaintSetter

NewPaintSetter returns a new PaintSetter with the given optional parent: PaintSetter provides setting of basic Stroke and Fill painting parameters for selected items

func (*PaintSetter) FillProp added in v0.1.2 

func (pv *PaintSetter) FillProp() string

FillProp returns the fill property string according to current settings

func (*PaintSetter) GetPaintType added in v0.1.2 

func (pv *PaintSetter) GetPaintType(nd svg.Node, clr image.Image, prop string) (PaintTypes, string)

GetPaintType decodes the paint type from paint and properties also returns the name of the gradient if using one.

func (*PaintSetter) GradStopsName added in v0.1.2 

func (pv *PaintSetter) GradStopsName(nd svg.Node, url string) string

GradStopsName returns the stopsname for gradient from url

func (*PaintSetter) Init added in v0.1.2 

func (pv *PaintSetter) Init()

func (*PaintSetter) IsFillOn added in v0.1.2 

func (pv *PaintSetter) IsFillOn() bool

IsFillOn returns true if Fill is active

func (*PaintSetter) IsStrokeOn added in v0.1.2 

func (pv *PaintSetter) IsStrokeOn() bool

IsStrokeOn returns true if stroke is active

func (*PaintSetter) MarkerProperties added in v0.1.2 

func (pv *PaintSetter) MarkerProperties() (start, mid, end string, sc, mc, ec MarkerColors)

MarkerProp returns the marker property string according to current settings along with color type to set.

func (*PaintSetter) PaintTypeStack added in v0.1.2 

func (pv *PaintSetter) PaintTypeStack(pt PaintTypes) int

func (*PaintSetter) SelectFillGrad added in v0.1.2 

func (pv *PaintSetter) SelectFillGrad()

func (*PaintSetter) SelectStrokeGrad added in v0.1.2 

func (pv *PaintSetter) SelectStrokeGrad()

func (*PaintSetter) SetCanvas added in v0.1.2 

func (t *PaintSetter) SetCanvas(v *Canvas) *PaintSetter

SetCanvas sets the [PaintSetter.Canvas]: the parent Canvas

func (*PaintSetter) SetColorNode added in v0.1.2 

func (pv *PaintSetter) SetColorNode(nd svg.Node, prop string, prev, pt PaintTypes, sp string)

SetColorNode sets the color properties of Node based on previous and current PaintType

func (*PaintSetter) SetFill added in v0.1.2 

func (pv *PaintSetter) SetFill(prev, pt PaintTypes, fp string)

SetFill sets the fill properties of selected items based on previous and current PaintType

func (*PaintSetter) SetFillOthers added in v0.1.2 

func (pv *PaintSetter) SetFillOthers(nd svg.Node)

func (*PaintSetter) SetFillStack added in v0.1.2 

func (pv *PaintSetter) SetFillStack(pt PaintTypes)

func (*PaintSetter) SetFillStops added in v0.1.2 

func (t *PaintSetter) SetFillStops(v string) *PaintSetter

SetFillStops sets the [PaintSetter.FillStops]: name of gradient with stops

func (*PaintSetter) SetFillType added in v0.1.2 

func (t *PaintSetter) SetFillType(v PaintTypes) *PaintSetter

SetFillType sets the [PaintSetter.FillType]: paint type for fill

func (*PaintSetter) SetPaintStyle added in v0.1.2 

func (t *PaintSetter) SetPaintStyle(v styles.Paint) *PaintSetter

SetPaintStyle sets the [PaintSetter.PaintStyle]: Active styles

func (*PaintSetter) SetProperties added in v0.1.2 

func (pv *PaintSetter) SetProperties(nd svg.Node)

SetProperties sets the properties for given node according to current settings

func (*PaintSetter) SetStroke added in v0.1.2 

func (pv *PaintSetter) SetStroke(prev, pt PaintTypes, sp string)

SetStroke sets the stroke properties of selected items based on previous and current PaintType

func (*PaintSetter) SetStrokeOpacity added in v0.1.2 

func (pv *PaintSetter) SetStrokeOpacity(nd svg.Node)

SetStrokeOpacity sets stroke opacity

func (*PaintSetter) SetStrokeOthers added in v0.1.2 

func (pv *PaintSetter) SetStrokeOthers(nd svg.Node)

SetStrokeOthers sets opacity and stroke width properties

func (*PaintSetter) SetStrokeStack added in v0.1.2 

func (pv *PaintSetter) SetStrokeStack(pt PaintTypes)

func (*PaintSetter) SetStrokeStops added in v0.1.2 

func (t *PaintSetter) SetStrokeStops(v string) *PaintSetter

SetStrokeStops sets the [PaintSetter.StrokeStops]: name of gradient with stops

func (*PaintSetter) SetStrokeType added in v0.1.2 

func (t *PaintSetter) SetStrokeType(v PaintTypes) *PaintSetter

SetStrokeType sets the [PaintSetter.StrokeType]: paint type for stroke

func (*PaintSetter) StrokeDashProp added in v0.1.2 

func (pv *PaintSetter) StrokeDashProp() []float64

StrokeDashProp returns stroke-dasharray property as an array (nil = none) these values need to be multiplied by line widths for each item.

func (*PaintSetter) StrokeProp added in v0.1.2 

func (pv *PaintSetter) StrokeProp() string

StrokeProp returns the stroke property string according to current settings

func (*PaintSetter) UpdateFillOpacity added in v0.1.2 

func (pv *PaintSetter) UpdateFillOpacity()

func (*PaintSetter) UpdateFromNode added in v0.1.2 

func (pv *PaintSetter) UpdateFromNode(ps *styles.Paint, nd svg.Node)

UpdateFromNode updates the current settings based on the values in the given Paint Style and properties from node (node can be nil)

func (*PaintSetter) UpdateStrokeOpacity added in v0.1.2 

func (pv *PaintSetter) UpdateStrokeOpacity()

type PaintTypes 

type PaintTypes int32 //enums:enum -trim-prefix Paint

const (
	PaintOff PaintTypes = iota
	PaintSolid
	PaintLinear
	PaintRadial
	PaintInherit
)
const PaintTypesN PaintTypes = 5

PaintTypesN is the highest valid value for type PaintTypes, plus one.

func PaintTypesValues 

func PaintTypesValues() []PaintTypes

PaintTypesValues returns all possible values for the type PaintTypes.

func (PaintTypes) Desc 

func (i PaintTypes) Desc() string

Desc returns the description of the PaintTypes value.

func (PaintTypes) Int64 

func (i PaintTypes) Int64() int64

Int64 returns the PaintTypes value as an int64.

func (PaintTypes) MarshalText 

func (i PaintTypes) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*PaintTypes) SetInt64 

func (i *PaintTypes) SetInt64(in int64)

SetInt64 sets the PaintTypes value from an int64.

func (*PaintTypes) SetString 

func (i *PaintTypes) SetString(s string) error

SetString sets the PaintTypes value from its string representation, and returns an error if the string is invalid.

func (PaintTypes) String 

func (i PaintTypes) String() string

String returns the string representation of this PaintTypes value.

func (*PaintTypes) UnmarshalText 

func (i *PaintTypes) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (PaintTypes) Values 

func (i PaintTypes) Values() []enums.Enum

Values returns all possible values for the type PaintTypes.

type PathNode 

type PathNode struct {
	// path command using sprite encoding
	Cmd Sprites

	// CmdPath command using ppath float32 encoding
	CmdPath float32

	// index of start of command in path
	Index int

	// logical index of point within current command (0 = first point, etc)
	PtIndex int

	// original data points:
	Start, End, Cp1, Cp2 math32.Vector2

	// transformed to scene coordinates:
	TStart, TEnd, TCp1, TCp2 math32.Vector2
}

PathNode is info about each node in a path that is being edited

func (*PathNode) EndIndex added in v0.1.2 

func (pn *PathNode) EndIndex() int

EndIndex returns the exclusive index for the end of this command: Index + CmdLen for this command.

type PhysicalSize added in v0.1.2 

type PhysicalSize struct {

	// select a standard size -- this will set units and size
	StandardSize StandardSizes `default:"Img1280x720"`

	// for standard size, use first number as width, second as height
	Portrait bool `default:"false"`

	// default units to use, e.g., in line widths etc
	Units units.Units `default:"px"`

	// drawing size, in Units
	Size math32.Vector2

	// grid spacing, in units of ViewBox size
	Grid float32 `default:"32"`
}

PhysicalSize specifies the physical size of the drawing, when making a new one

func (*PhysicalSize) Defaults added in v0.1.2 

func (ps *PhysicalSize) Defaults()

func (*PhysicalSize) SetFromSVG added in v0.1.2 

func (ps *PhysicalSize) SetFromSVG(sv *SVG)

SetFromSVG sets from svg

func (*PhysicalSize) SetStandardSize added in v0.1.2 

func (ps *PhysicalSize) SetStandardSize(std StandardSizes) error

SetStandardSize sets drawing to a standard size

func (*PhysicalSize) SetToSVG added in v0.1.2 

func (ps *PhysicalSize) SetToSVG(sv *SVG)

SetToSVG sets svg from us

func (*PhysicalSize) SetToStandardSize added in v0.1.2 

func (ps *PhysicalSize) SetToStandardSize() error

SetToStandardSize sets drawing to the current standard size value

func (*PhysicalSize) Update added in v0.1.2 

func (ps *PhysicalSize) Update()

type SVG 

type SVG struct {
	core.Frame

	// SVG is the SVG drawing to display in this widget
	SVG *svg.SVG `set:"-"`

	// the parent [Canvas]
	Canvas *Canvas `copier:"-" json:"-" xml:"-" display:"-" set:"-"`

	// Grid spacing, in native ViewBox units.
	Grid float32 ` set:"-"`

	// GridPixels is the current pixel (dot) grid spacing, with scaling.
	// Will be a multiple of underlying Grid if < SnapZone.
	GridPixels math32.Vector2 `edit:"-" set:"-"`

	// GridOffset is the current pixel offset in mouse coordinates.
	GridOffset math32.Vector2 `edit:"-" set:"-"`
}

SVG is the element for viewing and interacting with the SVG.

func NewSVG 

func NewSVG(parent ...tree.Node) *SVG

NewSVG returns a new SVG with the given optional parent: SVG is the element for viewing and interacting with the SVG.

func (*SVG) Align added in v0.1.2 

func (sv *SVG) Align(aa AlignAnchors, al Aligns)

func (*SVG) AlignCenter added in v0.1.2 

func (sv *SVG) AlignCenter(aa AlignAnchors, dim math32.Dims, act string)

func (*SVG) AlignMax added in v0.1.2 

func (sv *SVG) AlignMax(aa AlignAnchors, dim math32.Dims, act string)

func (*SVG) AlignMaxAnchor added in v0.1.2 

func (sv *SVG) AlignMaxAnchor(aa AlignAnchors, dim math32.Dims, act string)

func (*SVG) AlignMin added in v0.1.2 

func (sv *SVG) AlignMin(aa AlignAnchors, dim math32.Dims, act string)

AlignMin aligns to min coordinate (Left, Top) in bbox

func (*SVG) AlignMinAnchor added in v0.1.2 

func (sv *SVG) AlignMinAnchor(aa AlignAnchors, dim math32.Dims, act string)

func (*SVG) CleanupInkscapeText added in v0.1.2 

func (sv *SVG) CleanupInkscapeText()

CleanupInkscapeText fixes the inkscape text properties which are excessive and bad.

func (*SVG) ConstrainPoint 

func (sv *SVG) ConstrainPoint(st, rawpt math32.Vector2) (math32.Vector2, bool)

ConstrainPoint constrains movement of point relative to starting point to either X, Y or diagonal. returns constrained point, and whether the constraint is along the diagonal, which can then trigger reshaping the object to be along the diagonal as well. also adds constraint to AlignMatches.

func (*SVG) DepthMap 

func (sv *SVG) DepthMap() map[tree.Node]int

DepthMap returns a map of all nodes and their associated depth count counting up from 0 as the deepest, first drawn node.

func (*SVG) DistributeProps added in v0.1.2 

func (sv *SVG) DistributeProps()

DistributeProps distributes properties into leaf nodes from groups. Putting properties on groups is not good for editing.

func (*SVG) DragDelta added in v0.1.2 

func (sv *SVG) DragDelta(e events.Event, node bool) (spt, mpt, dv math32.Vector2)

func (*SVG) DragMove 

func (sv *SVG) DragMove(e events.Event)

DragMove is when dragging a selection for moving

func (*SVG) DrawAlignMatch added in v0.1.2 

func (sv *SVG) DrawAlignMatch(sp *core.Sprite, trgsz image.Point) func(pc *paint.Painter)

DrawAlignMatch renders an alignment line

func (*SVG) DrawLineAdd added in v0.1.2 

func (sv *SVG) DrawLineAdd(sp *core.Sprite, trgsz image.Point) func(pc *paint.Painter)

DrawLineAdd where new line would go.

func (*SVG) DrawNodeAdd added in v0.1.2 

func (sv *SVG) DrawNodeAdd(ntyp Sprites, pos image.Point)

func (*SVG) DrawPoint added in v0.1.2 

func (sv *SVG) DrawPoint(e events.Event) image.Point

DrawPoint updates the DrawPos and DrawSnapPos from event position. Returns the DrawSnapPos, which is the point to use for drawing.

func (*SVG) DrawRubberBand added in v0.1.2 

func (sv *SVG) DrawRubberBand(sp *core.Sprite, trgsz image.Point) func(pc *paint.Painter)

DrawRubberBand renders the rubber-band box.

func (*SVG) DrawSpriteNodeCtrl added in v0.1.2 

func (sv *SVG) DrawSpriteNodeCtrl(es *EditState, sp *core.Sprite, subtyp Sprites, idx int, nodepos image.Point) func(pc *paint.Painter)

DrawSpriteNodeCtrl renders a NodeControl sprite handle

func (*SVG) DrawSpriteNodePoint added in v0.1.2 

func (sv *SVG) DrawSpriteNodePoint(es *EditState, sp *core.Sprite, bbtyp Sprites, idx int) func(pc *paint.Painter)

DrawSpriteNodePoint renders a NodePoint sprite handle

func (*SVG) DrawSpriteReshape added in v0.1.2 

func (sv *SVG) DrawSpriteReshape(sp *core.Sprite, bbtyp Sprites) func(pc *paint.Painter)

DrawSpriteReshape returns sprite Draw function for reshape points

func (*SVG) DrawSpriteSelect added in v0.1.2 

func (sv *SVG) DrawSpriteSelect(sp *core.Sprite, bbtyp Sprites) func(pc *paint.Painter)

DrawSpriteSelect renders a Select sprite handle -- smaller

func (*SVG) EditNode 

func (sv *SVG) EditNode(n tree.Node)

EditNode opens a core.Form dialog on the given node.

func (*SVG) EditState 

func (sv *SVG) EditState() *EditState

EditState returns the EditState for this view

func (*SVG) GatherAlignPoints 

func (sv *SVG) GatherAlignPoints()

GatherAlignPoints gets all the potential points of alignment for objects not in selection group

func (*SVG) Gradients 

func (sv *SVG) Gradients() []*Gradient

Gradients returns the currently defined gradients with stops that are shared among obj-specific ones

func (*SVG) HandleSpriteSize added in v0.1.2 

func (sv *SVG) HandleSpriteSize(scale float32, pos image.Point) (bb image.Rectangle, rdraw math32.Box2)

HandleSpriteSize returns the bounding box and rect draw coords for handle-type sprites.

func (*SVG) InactivateAlignSprites added in v0.1.2 

func (sv *SVG) InactivateAlignSprites()

InactivateAlignSprites inactivates align sprites, doing lock, unlock

func (*SVG) InactivateSprites added in v0.1.2 

func (sv *SVG) InactivateSprites(typ Sprites)

InactivateSprites inactivates sprites of given type; must be locked.

func (*SVG) Init 

func (sv *SVG) Init()

func (*SVG) ManipDone 

func (sv *SVG) ManipDone()

ManipDone happens when a manipulation has finished: resets action, does render

func (*SVG) ManipStart 

func (sv *SVG) ManipStart(act Actions, data string)

ManipStart is called at the start of a manipulation, saving the state prior to the action

func (*SVG) ManipStartInDrag added in v0.1.2 

func (sv *SVG) ManipStartInDrag(act Actions, data string)

ManipStartInDrag is called at the start of a dragging action to ensure that the action has started if it hasn't already, and to reset the align sprites. sprites must already be locked.

func (*SVG) MetaData 

func (sv *SVG) MetaData(mknew bool) (main, grid *svg.MetaData)

MetaData returns the overall metadata and grid if present. if mknew is true, it will create new ones if not found.

func (*SVG) NewParent added in v0.1.2 

func (sv *SVG) NewParent(useTree bool) tree.Node

NewParent returns a parent for creating a new SVG element. It uses the current selected group in SVG, or node selected in tree if useTree is true, or active layer if it is set. If nothing else, it returns the SVG Root node.

func (*SVG) NewPath 

func (sv *SVG) NewPath(start, end image.Point) *svg.Path

NewPath makes a new SVG Path element during the drag operation

func (*SVG) NewText 

func (sv *SVG) NewText(start, end image.Point) svg.Node

NewText makes a new Text element with embedded tspan

func (*SVG) NodeAdd added in v0.1.2 

func (sv *SVG) NodeAdd(ntyp Sprites, p ppath.Path, end, start math32.Vector2) ppath.Path

func (*SVG) NodeAppend added in v0.1.2 

func (sv *SVG) NodeAppend(ntyp Sprites)

func (*SVG) NodeDelete added in v0.1.2 

func (sv *SVG) NodeDelete(idx int)

NodeDelete deletes node from active path at given index. if doing multiple deletes in a loop, go in reverse.

func (*SVG) NodeDeleteLast added in v0.1.2 

func (sv *SVG) NodeDeleteLast()

NodeDeleteLast deletes the last node from ActivePath if n > 1.

func (*SVG) NodeInsert added in v0.1.2 

func (sv *SVG) NodeInsert(ntyp Sprites, idx int)

func (*SVG) NodeReplace added in v0.1.2 

func (sv *SVG) NodeReplace(ntyp Sprites, idx int)

func (*SVG) OpenFileCleanup added in v0.1.2 

func (sv *SVG) OpenFileCleanup()

OpenFileCleanup cleans up various aspects of SVG files for editing.

func (*SVG) PathCtrlMove added in v0.1.2 

func (sv *SVG) PathCtrlMove(pidx int, ctyp Sprites, dxf math32.Matrix2) math32.Vector2

PathCtrlMove moves given node control point index by given delta transform. returns scene position of given point.

func (*SVG) PathNodeMove added in v0.1.2 

func (sv *SVG) PathNodeMove(pidx int, pointOnly bool, dv math32.Vector2, dxf math32.Matrix2)

PathNodeMove moves given node index by given delta transform. pointOnly = true moves just the end point, otherwise all move.

func (*SVG) PathNodes 

func (sv *SVG) PathNodes(path *svg.Path) []*PathNode

PathNodes returns the PathNode data for given svg.Path.

func (*SVG) ReadMetaData 

func (sv *SVG) ReadMetaData()

ReadMetaData reads meta data of drawing

func (*SVG) Redo 

func (sv *SVG) Redo() string

Redo redoes one step, returning the action that was redone

func (*SVG) RemoveEmptyGroups added in v0.1.2 

func (sv *SVG) RemoveEmptyGroups()

RemoveEmptyGroups removes groups that have no children.

func (*SVG) RemoveNodeSprites 

func (sv *SVG) RemoveNodeSprites()

func (*SVG) RemoveSelSprites 

func (sv *SVG) RemoveSelSprites()

func (*SVG) Render 

func (sv *SVG) Render()

func (*SVG) RenderGrid added in v0.1.2 

func (sv *SVG) RenderGrid()

RenderGrid renders the background grid

func (*SVG) ResizeToContents 

func (sv *SVG) ResizeToContents(gridIncr bool)

ResizeToContents resizes the drawing to just fit the current contents, including moving everything to start at upper-left corner, optionally preserving the current grid sizing, so grid snapping is preserved, which is recommended.

func (*SVG) Root 

func (sv *SVG) Root() *svg.Root

Root returns the root svg.Root.

func (*SVG) SelectContainsPoint 

func (sv *SVG) SelectContainsPoint(pt image.Point, leavesOnly, excludeSel bool) svg.Node

SelectContainsPoint finds the first node that contains the given point in scene coordinates; nil if none. If leavesOnly is set then only nodes that have no nodes (leaves, terminal nodes) will be considered. If excludeSel, any leaf nodes that are within the current edit selection are excluded,

func (*SVG) SelectWithinBBox 

func (sv *SVG) SelectWithinBBox(bbox math32.Box2, leavesOnly bool) []svg.Node

SelectWithinBBox returns a list of all nodes whose BBox is fully contained within the given BBox. SVG version excludes layer groups.

func (*SVG) SetBBoxSpritePos 

func (sv *SVG) SetBBoxSpritePos(typ Sprites, idx int, bbox math32.Box2)

SetBBoxSpritePos sets positions of given type of sprites.

func (*SVG) SetMetaData 

func (sv *SVG) SetMetaData()

SetMetaData sets meta data of drawing

func (*SVG) SetRubberBand 

func (sv *SVG) SetRubberBand(cur image.Point)

SetRubberBand updates the rubber band position.

func (*SVG) SetSVGName 

func (sv *SVG) SetSVGName(el svg.Node)

SetSVGName sets the name of the element to standard type + id name

func (*SVG) SetSpritePos added in v0.1.2 

func (sv *SVG) SetSpritePos(sp *core.Sprite, x, y int)

SetSpritePos sets sprite position, taking into account relative offsets

func (*SVG) ShowAlignMatches 

func (sv *SVG) ShowAlignMatches(pts []image.Rectangle, typs []BBoxPoints)

ShowAlignMatches draws the align matches as given between BBox Min - Max. typs are corresponding bounding box sources. sprites must already be locked.

func (*SVG) SizeFinal 

func (sv *SVG) SizeFinal()

func (*SVG) SnapBBox 

func (sv *SVG) SnapBBox(rawbb math32.Box2) math32.Box2

SnapBBox does snapping on given raw bbox according to settings, aligning movement of bbox edges / centers relative to other bboxes.. returns snapped bbox.

func (*SVG) SnapGridPoint added in v0.1.2 

func (sv *SVG) SnapGridPoint(rawpt math32.Vector2) math32.Vector2

func (*SVG) SnapPoint 

func (sv *SVG) SnapPoint(rawpt math32.Vector2) math32.Vector2

SnapPoint does grid and align snapping on one raw point, given that point, in window coordinates. returns the snapped point.

func (*SVG) Sprite added in v0.1.2 

func (sv *SVG) Sprite(typ, subtyp Sprites, idx int, trgsz image.Point, init func(sp *core.Sprite)) *core.Sprite

Sprite returns the given sprite in the context of the given widget, making it if not yet made. trgsz is the target size (e.g., for rubber band boxes). Init function is called on new sprites.

func (*SVG) SpriteCtrlDrag added in v0.1.2 

func (sv *SVG) SpriteCtrlDrag(idx int, ctyp Sprites, e events.Event)

SpriteCtrlDrag processes a mouse node drag event on a path control sprite

func (*SVG) SpriteNodeDrag added in v0.1.2 

func (sv *SVG) SpriteNodeDrag(idx int, e events.Event)

SpriteNodeDrag processes a mouse node drag event on a path node sprite

func (*SVG) SpriteReshapeDrag 

func (sv *SVG) SpriteReshapeDrag(sp Sprites, e events.Event)

SpriteReshapeDrag processes a mouse reshape drag event on a selection sprite

func (*SVG) SpriteRotateDrag 

func (sv *SVG) SpriteRotateDrag(sp Sprites, e events.Event)

SpriteRotateDrag processes a mouse rotate drag event on a selection sprite

func (*SVG) SpritesLock added in v0.1.2 

func (sv *SVG) SpritesLock() *core.Sprites

SpritesLock returns the core.Sprites under mutex lock.

func (*SVG) SpritesNoLock added in v0.1.2 

func (sv *SVG) SpritesNoLock() *core.Sprites

SpritesNoLock returns the core.Sprites without locking.

func (*SVG) TransformAllLeaves 

func (sv *SVG) TransformAllLeaves(trans math32.Vector2, scale math32.Vector2, rot float32, pt math32.Vector2)

TransformAllLeaves transforms all the leaf items in the drawing (not groups) uses ApplyDeltaTransform manipulation.

func (*SVG) Undo 

func (sv *SVG) Undo() string

Undo undoes one step, returning the action that was undone

func (*SVG) UndoSave 

func (sv *SVG) UndoSave(action, data string)

UndoSave save current state for potential undo

func (*SVG) UndoSaveReplace 

func (sv *SVG) UndoSaveReplace(action, data string)

UndoSaveReplace save current state to replace current

func (*SVG) UngroupSingletons added in v0.1.2 

func (sv *SVG) UngroupSingletons()

UngroupSingletons moves leaf nodes that are all by self in a group out of the group.

func (*SVG) UpdateGradients 

func (sv *SVG) UpdateGradients(gl []*Gradient)

UpdateGradients update SVG gradients from given gradient list.

func (*SVG) UpdateGridPixels added in v0.1.2 

func (sv *SVG) UpdateGridPixels()

UpdateGridPixels updates the GirdEff value based on current scale

func (*SVG) UpdateLineAddSprite added in v0.1.2 

func (sv *SVG) UpdateLineAddSprite()

func (*SVG) UpdateNodeSprites 

func (sv *SVG) UpdateNodeSprites()

func (*SVG) UpdateSelSprites 

func (sv *SVG) UpdateSelSprites()

func (*SVG) UpdateSelect 

func (sv *SVG) UpdateSelect()

UpdateSelect should be called whenever selection changes

func (*SVG) UpdateView 

func (sv *SVG) UpdateView()

UpdateView updates the SVG view

type SelectedState 

type SelectedState struct {

	// order item was selected
	Order int

	// Initial state of the node: copy of node struct.
	InitState svg.Node
}

SelectedState is state for selected nodes

type SettingsData 

type SettingsData struct {
	core.SettingsBase

	// default physical size, when app is started without opening a file
	Size PhysicalSize `display:"add-fields"`

	// turns on the grid display
	ShowGrid bool `default:"true"`

	// snap to grid intervals.
	SnapGrid bool `default:"true"`

	// snap to align with other elements.
	SnapAlign bool `default:"true"`

	// snap individual path nodes using snap settings, while drawing and editing nodes.
	SnapNodes bool `default:"true"`

	// zone of attraction around a potential snapping point (grid, align) where
	// snapping happens. Small values here allow a reasonable balance of snapping
	// and non-snapping, while larger values produce more visible and strong snapping
	// constraints.
	SnapZone int `min:"1" default:"3"`

	// enables saving of metadata about the image (in inkscape-compatible format)
	MetaData bool
}

SettingsData is the overall Vector settings

func (*SettingsData) Defaults 

func (se *SettingsData) Defaults()

func (*SettingsData) Open 

func (se *SettingsData) Open() error

func (*SettingsData) Save 

func (se *SettingsData) Save() error

func (*SettingsData) Update 

func (se *SettingsData) Update()

type Sprites 

type Sprites int32 //enums:enum -transform kebab -trim-prefix Sp

Sprites are the type of sprite 

const (
	// SpNone is used for subtypes
	SpNone Sprites = iota

	// SpReshapeBBox is a reshape bbox -- the overall active selection BBox
	// for active manipulation
	SpReshapeBBox

	// SpSelBBox is a selection bounding box -- display only
	SpSelBBox

	// SpNodePoint is a main coordinate point for path node
	SpNodePoint

	// SpNodeCtrl is a control coordinate point for path node
	SpNodeCtrl

	// SpRubberBand is the draggable selection box
	SpRubberBand

	// SpAlignMatch is an alignment match (n of these),
	SpAlignMatch

	// SpLineAdd is preview of new line to add
	SpLineAdd

	// Sprite bounding boxes are set as a "bbox" property on sprites
	SpUpL
	SpUpC
	SpUpR
	SpDnL
	SpDnC
	SpDnR
	SpLfM
	SpRtM

	// Node points
	SpMoveTo
	SpLineTo
	SpCubeTo
	SpQuadTo
	SpArcTo
	SpClose

	SpStart
	SpEnd
	SpQuad1
	SpCube1
	SpCube2
)
const SpritesN Sprites = 27

SpritesN is the highest valid value for type Sprites, plus one.

func SpriteProperties 

func SpriteProperties(sp *core.Sprite) (typ, subtyp Sprites, idx int)

SpriteProperties reads the sprite properties -- returns SpNone if not one of our sprites.

func SpritesValues 

func SpritesValues() []Sprites

SpritesValues returns all possible values for the type Sprites.

func (Sprites) Desc 

func (i Sprites) Desc() string

Desc returns the description of the Sprites value.

func (Sprites) Int64 

func (i Sprites) Int64() int64

Int64 returns the Sprites value as an int64.

func (Sprites) MarshalText 

func (i Sprites) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*Sprites) SetInt64 

func (i *Sprites) SetInt64(in int64)

SetInt64 sets the Sprites value from an int64.

func (*Sprites) SetString 

func (i *Sprites) SetString(s string) error

SetString sets the Sprites value from its string representation, and returns an error if the string is invalid.

func (Sprites) String 

func (i Sprites) String() string

String returns the string representation of this Sprites value.

func (*Sprites) UnmarshalText 

func (i *Sprites) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (Sprites) Values 

func (i Sprites) Values() []enums.Enum

Values returns all possible values for the type Sprites.

type StandardSizeValues 

type StandardSizeValues struct {
	Units units.Units
	X     float32
	Y     float32
}

StandardSizeValues are values for standard sizes

type StandardSizes 

type StandardSizes int32 //enums:enum

StandardSizes are standard physical drawing sizes 

const (
	// CustomSize =  nonstandard
	CustomSize StandardSizes = iota

	// Image 1280x720 Px = 720p
	Img1280x720

	// Image 1920x1080 Px = 1080p HD
	Img1920x1080

	// Image 3840x2160 Px = 4K
	Img3840x2160

	// Image 7680x4320 Px = 8K
	Img7680x4320

	// Image 1024x768 Px = XGA
	Img1024x768

	// Image 720x480 Px = DVD
	Img720x480

	// Image 640x480 Px = VGA
	Img640x480

	// Image 320x240 Px = old CRT
	Img320x240

	// A4 = 210 x 297 mm
	A4

	// USLetter = 8.5 x 11 in = 612 x 792 pt
	USLetter

	// USLegal = 8.5 x 14 in = 612 x 1008 pt
	USLegal

	// A0 = 841 x 1189 mm
	A0

	// A1 = 594 x 841 mm
	A1

	// A2 = 420 x 594 mm
	A2

	// A3 = 297 x 420 mm
	A3

	// A5 = 148 x 210 mm
	A5

	// A6 = 105 x 148 mm
	A6

	// A7 = 74 x 105
	A7

	// A8 = 52 x 74 mm
	A8

	// A9 = 37 x 52
	A9

	// A10 = 26 x 37
	A10
)
const StandardSizesN StandardSizes = 22

StandardSizesN is the highest valid value for type StandardSizes, plus one.

func MatchStandardSize 

func MatchStandardSize(wd, ht float32, un units.Units) StandardSizes

func StandardSizesValues 

func StandardSizesValues() []StandardSizes

StandardSizesValues returns all possible values for the type StandardSizes.

func (StandardSizes) Desc 

func (i StandardSizes) Desc() string

Desc returns the description of the StandardSizes value.

func (StandardSizes) Int64 

func (i StandardSizes) Int64() int64

Int64 returns the StandardSizes value as an int64.

func (StandardSizes) MarshalText 

func (i StandardSizes) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*StandardSizes) SetInt64 

func (i *StandardSizes) SetInt64(in int64)

SetInt64 sets the StandardSizes value from an int64.

func (*StandardSizes) SetString 

func (i *StandardSizes) SetString(s string) error

SetString sets the StandardSizes value from its string representation, and returns an error if the string is invalid.

func (StandardSizes) String 

func (i StandardSizes) String() string

String returns the string representation of this StandardSizes value.

func (*StandardSizes) UnmarshalText 

func (i *StandardSizes) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (StandardSizes) Values 

func (i StandardSizes) Values() []enums.Enum

Values returns all possible values for the type StandardSizes.

type TextStyle 

type TextStyle struct {
	// current text to edit
	String string `label:"Text"`

	// Color is the fill color to render the text in.
	Color color.RGBA `new-window:"+"`

	// Stroke is the stroke color to render the text in: this is typically
	// not set for standard text rendering, but can be used to render an outline
	// around the text glyphs.
	Stroke color.RGBA `new-window:"+"`

	// Opacity is the overall opacity multiplier on the text, between 0-1.
	Opacity float32 `min:"0" max:"1", step:"0.1"`

	// Font styling properties.
	Font styles.Font `display:"add-fields"`

	// Text styling properties.
	Text styles.Text `display:"add-fields"`

	// the parent [Canvas]
	Canvas *Canvas `copier:"-" json:"-" xml:"-" display:"-"`
}

TextStyle is text styling info -- using Form to do text editor

func (*TextStyle) Defaults 

func (ts *TextStyle) Defaults()

func (*TextStyle) SetFromNode 

func (ts *TextStyle) SetFromNode(txt *svg.Text)

SetFromNode sets text style info from given svg.Text node

func (*TextStyle) SetTextProperties added in v0.1.2 

func (ts *TextStyle) SetTextProperties()

SetTextProperties sets the text properties of selected Text nodes.

func (*TextStyle) TextProperties 

func (ts *TextStyle) TextProperties() map[string]any

TextProperties returns non-default text properties to set

func (*TextStyle) Update 

func (ts *TextStyle) Update()

Update updates any selected text from updated settings in TextStyle.

type Tools 

type Tools int //enums:enum

Tools are the drawing tools 

const (
	SelectTool Tools = iota
	SelBoxTool
	NodeTool
	RectTool
	EllipseTool
	BezierTool
	TextTool
)
const ToolsN Tools = 7

ToolsN is the highest valid value for type Tools, plus one.

func ToolsValues 

func ToolsValues() []Tools

ToolsValues returns all possible values for the type Tools.

func (Tools) Desc 

func (i Tools) Desc() string

Desc returns the description of the Tools value.

func (Tools) Int64 

func (i Tools) Int64() int64

Int64 returns the Tools value as an int64.

func (Tools) MarshalText 

func (i Tools) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*Tools) SetInt64 

func (i *Tools) SetInt64(in int64)

SetInt64 sets the Tools value from an int64.

func (*Tools) SetString 

func (i *Tools) SetString(s string) error

SetString sets the Tools value from its string representation, and returns an error if the string is invalid.

func (Tools) String 

func (i Tools) String() string

String returns the string representation of this Tools value.

func (*Tools) UnmarshalText 

func (i *Tools) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (Tools) Values 

func (i Tools) Values() []enums.Enum

Values returns all possible values for the type Tools.

type Tree 

type Tree struct {
	core.Tree

	// the parent [Canvas]
	Canvas *Canvas `copier:"-" json:"-" xml:"-" display:"-"`
}

Tree is a core.Tree that interacts properly with Canvas.

func NewTree 

func NewTree(parent ...tree.Node) *Tree

NewTree returns a new Tree with the given optional parent: Tree is a core.Tree that interacts properly with Canvas.

func (*Tree) CanvasRoot added in v0.1.2 

func (tv *Tree) CanvasRoot() *Tree

FileRoot returns the Root node as a Tree.

func (*Tree) Init 

func (tv *Tree) Init()

func (*Tree) LayerClearCurrent 

func (tv *Tree) LayerClearCurrent()

LayerClearCurrent clears this layer as the current layer if it was set as such.

func (*Tree) LayerIsCurrent 

func (tv *Tree) LayerIsCurrent() bool

LayerIsCurrent returns true if layer is the current active one for creating.

func (*Tree) LayerSetCurrent 

func (tv *Tree) LayerSetCurrent()

LayerSetCurrent sets this layer as the current layer name

func (*Tree) LayerToggleLock 

func (tv *Tree) LayerToggleLock()

LayerToggleLock toggles whether layer is locked or not

func (*Tree) LayerToggleVis 

func (tv *Tree) LayerToggleVis()

LayerToggleVis toggles visibility of the layer

func (*Tree) NewGroup added in v0.1.2 

func (tv *Tree) NewGroup()

NewGroup makes a new group.

func (*Tree) SelectSVG 

func (tv *Tree) SelectSVG()

SelectSVG selects node in SVG

func (*Tree) SetCanvas 

func (t *Tree) SetCanvas(v *Canvas) *Tree

SetCanvas sets the [Tree.Canvas]: the parent Canvas

Source Files

View all Source files

Directories

Path Synopsis
cmd
canvas command

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