shape

package module
v0.0.0-...-b703096 Latest Latest
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 Go to latest Published: Mar 24, 2020 License: MIT, Unlicense Imports: 9 Imported by: 3

README

Shape

A library for drawing common shapes like: line, circle, rectangle and more.

Line

shape.Line{a,b,...}.Stroke(color, width, gtx)

Circle

shape.Circle{c,r}.Stroke(color, width, gtx)
shape.Circle{c,r}.Fill(color, gtx)

Rectangle

shape.Rectangle{a,b}.Stroke(color, width, gtx)
shape.Rectangle{a,b}.Fill(color, gtx)

Triangle

shape.Triangle{a,b,c}.Stroke(color, width, gtx)
shape.Triangle{a,b,c}.Fill(color, gtx)

Curve

shape.Curve{a,b,...}.Stroke(color, width,gtx)

Points

...

Example Draw Red Line

func drawLine(gtx *layout.Context) {
    red := color.RGBA{255,0,0,255}
    s := gtx.Constraints
    w, h := float32(s.Width.Max), float32(s.Height.Max)
    shape.Line{{0,h/2},{w,h/2}}.Stroke(red, width, gtx)
}

See in example folder for gio application with more examples of shapes.

Read More

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func ButtCapper 

func ButtCapper(offset float32, p1, p2 f32.Point) f32.Point

func DrawArc 

func DrawArc(ops *op.Ops)

func Inf 

func Inf(sign int) float32

func IsInf 

func IsInf(f float32, sign int) bool

func IsNaN 

func IsNaN(sign float32) bool

func Line2 

func Line2(gtx *layout.Context, width float32, ps ...f32.Point)

func Max 

func Max(x, y float32) float32

func Min 

func Min(x, y float32) float32

func MitterJoiner 

func MitterJoiner(path clip.Path, offset float32, p1, p2, qp3 f32.Point)

func OffsetPoints 

func OffsetPoints(l Line, width float32) (offset []f32.Point)

func Overlay 

func Overlay(rs ...f32.Rectangle) f32.Rectangle

func PaintPoint 

func PaintPoint(p f32.Point, radius float32, gtx *layout.Context)

func PaintPoints 

func PaintPoints(ps []f32.Point, radius float32, gtx *layout.Context)

func RoundCapper 

func RoundCapper(offset float32, p1, p2 f32.Point) f32.Point

func RoundJoiner 

func RoundJoiner(path clip.Path, offset float32, p1, p2, qp3 f32.Point)

func SquareCapper 

func SquareCapper(offset float32, p1, p2 f32.Point) float32

func SquareJoiner 

func SquareJoiner(path clip.Path, offset float32, p1, p2, qp3 f32.Point)

Types

type BBox 

type BBox f32.Rectangle

func (BBox) Add 

func (bb BBox) Add(p f32.Point) (bb2 BBox)

func (BBox) Union 

func (bb BBox) Union(b BBox) (bb2 BBox)

type Canvas 

type Canvas struct {
	FillColor *color.RGBA

	StrokeWidth int
	StrokeColor *color.RGBA
	StrokeStyle StrokeStyle
	// contains filtered or unexported fields
}

func (*Canvas) DrawLine 

func (c *Canvas) DrawLine(p1, p2 f32.Point)

type Capper 

type Capper func(offset float32, p1, p2 f32.Point) f32.Point

type Circle 

type Circle struct {
	Center f32.Point
	Radius float32
}

func (Circle) Fill 

func (cc Circle) Fill(col color.RGBA, gtx *layout.Context) f32.Rectangle

func (Circle) Stroke 

func (cc Circle) Stroke(col color.RGBA, width float32, gtx *layout.Context) f32.Rectangle

type Cube 

type Cube struct {
	Point0, Point1, Point2, Point3 f32.Point
}

type Fill 

type Fill interface {
	Stroke
	Fill(rgba color.RGBA, ops *op.Ops)
}

type Joiner 

type Joiner func(path clip.Path, offset float32, p1, p2, qp3 f32.Point)

type Line 

type Line []f32.Point

func (Line) Stroke 

func (l Line) Stroke(c color.RGBA, width float32, gtx *layout.Context) (box f32.Rectangle)

An algorithm for polylines outline construction http://old.cescg.org/CESCG99/SKrivograd/

https://www.codeproject.com/Articles/226569/Drawing-polylines-by-tessellation

A Realistic 2D Drawing System https://keithp.com/~keithp/talks/cairo2003.pdf

https://stackoverflow.com/questions/5641769/how-to-draw-an-outline-around-any-line

Drawing Lines is Hard https://mattdesl.svbtle.com/drawing-lines-is-hard

type LineCap 

type LineCap int
const (
	Butt LineCap = iota
	Square
)

type LineJoin 

type LineJoin int
const (
	None LineJoin = iota
	Round
)

type Plus 

type Plus struct{}

func (Plus) Stroke 

func (p Plus) Stroke(width unit.Value, gtx *layout.Context) (box f32.Rectangle)

type Quad 

type Quad struct {
	Point0, Point1, Point2 f32.Point
}

type Rectangle 

type Rectangle struct {
	P1, P2 f32.Point
}

func (Rectangle) Fill 

func (r Rectangle) Fill(rgba color.RGBA, gtx *layout.Context) f32.Rectangle

func (Rectangle) Stroke 

func (r Rectangle) Stroke(rgba color.RGBA, lineWidth float32, gtx *layout.Context) f32.Rectangle

type Shape 

type Shape interface {
	Add(ops *op.Ops)
}

type Stroke 

type Stroke interface {
	Shape
	Stroke(width float32, style StrokeType, rgba color.RGBA, ops *op.Ops)
}

type StrokeStyle 

type StrokeStyle int
const (
	Solid StrokeStyle = iota
	Dotted
	Dashed
)

type StrokeType 

type StrokeType int

type Triangle 

type Triangle struct {
	A, B, C f32.Point
}

func (Triangle) Fill 

func (t Triangle) Fill(rgba color.RGBA, gtx *layout.Context) (bbox f32.Rectangle)

func (Triangle) Stroke 

func (t Triangle) Stroke(rgba color.RGBA, width float32, gtx *layout.Context) (bbox f32.Rectangle)

type Vector 

type Vector struct {
	// contains filtered or unexported fields
}

func (Vector) Magnitude 

func (v Vector) Magnitude() float32

func (Vector) Normalize 

func (v Vector) Normalize() Vector

Source Files

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Directories

Path Synopsis

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