nanovgo

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README

NanoVGo

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NanoVGo is a Go binding for NanoVG, a small antialiased vector graphics rendering library for OpenGL.

NanoVGo is in an early stage. Frequent changes to the APIs are expected, which will become stable after the 1.0.0 version.

Please note that NanoVGo is a Go binding created with Cgo, instead of a Go port. For a Go port of the NanoVG library, please refer to shibukawa/nanovgo.

NanoVG Version

Commit cfa175a (Sep 2, 2018).

Credits

NanoVGo uses the source code of NanoVG under the zlib license.

License

zlib

Documentation

Overview

Package nanovgo is a Go binding for NanoVG (https://github.com/memononen/nanovg), a small antialiased vector graphics rendering library for OpenGL.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func DegToRad 

func DegToRad(deg float32) float32

DegToRad converts degrees to radians.

func RadToDeg 

func RadToDeg(rad float32) float32

RadToDeg converts radians to degrees.

func TransformIdentity 

func TransformIdentity(dst *[6]float32)

TransformIdentity sets the transform to an identity matrix.

func TransformInverse 

func TransformInverse(dst *[6]float32, src [6]float32) (succeeded bool)

TransformInverse sets dst to the inverse of src. Returns true if the inverse could be calculated, else false.

func TransformMultiply 

func TransformMultiply(dst *[6]float32, src [6]float32)

TransformMultiply sets the transform to the result of multiplication of the two transforms, of A = A*B.

func TransformPoint 

func TransformPoint(xform [6]float32, srcX, srcY float32) (dstX, dstY float32)

TransformPoint transforms a point (srcX,srcY) by xform.

func TransformPremultiply 

func TransformPremultiply(dst *[6]float32, src [6]float32)

TransformPremultiply sets the transform to the result of multiplication of the two transforms, of A = B*A.

func TransformRotate 

func TransformRotate(dst *[6]float32, angle float32)

TransformRotate sets the transform to a rotate matrix. angle is specified in radians.

func TransformScale 

func TransformScale(dst *[6]float32, sx, sy float32)

TransformScale sets the transform to a scale matrix.

func TransformSkewX 

func TransformSkewX(dst *[6]float32, angle float32)

TransformSkewX sets the transform to a skew-x matrix. angle is specified in radians.

func TransformSkewY 

func TransformSkewY(dst *[6]float32, angle float32)

TransformSkewY sets the transform to a skew-y matrix. angle is specified in radians.

func TransformTranslate 

func TransformTranslate(dst *[6]float32, tx, ty float32)

TransformTranslate sets the transform to a translation matrix.

Types

type Align 

type Align int

Align indicates how text should be aligned horizontally or vertically. 

const (
	// Horizontal aligns.
	AlignLeft   Align = C.NVG_ALIGN_LEFT
	AlignCenter Align = C.NVG_ALIGN_CENTER
	AlignRight  Align = C.NVG_ALIGN_RIGHT
	// Vertical align.
	AlignTop      Align = C.NVG_ALIGN_TOP
	AlignMiddle   Align = C.NVG_ALIGN_MIDDLE
	AlignBottom   Align = C.NVG_ALIGN_BOTTOM
	AlignBaseline Align = C.NVG_ALIGN_BASELINE
)

Align styles.

type BlendFactor 

type BlendFactor int

BlendFactor indicates how blending should work. 

const (
	Zero             BlendFactor = C.NVG_ZERO
	One              BlendFactor = C.NVG_ONE
	SrcColor         BlendFactor = C.NVG_SRC_COLOR
	OneMinusSrcColor BlendFactor = C.NVG_ONE_MINUS_SRC_COLOR
	DstColor         BlendFactor = C.NVG_DST_COLOR
	OneMinusDstColor BlendFactor = C.NVG_ONE_MINUS_DST_COLOR
	SrcAlpha         BlendFactor = C.NVG_SRC_ALPHA
	OneMinusSrcAlpha BlendFactor = C.NVG_ONE_MINUS_SRC_ALPHA
	DstAlpha         BlendFactor = C.NVG_DST_ALPHA
	OneMinusDstAlpha BlendFactor = C.NVG_ONE_MINUS_DST_ALPHA
	SrcAlphaSaturate BlendFactor = C.NVG_SRC_ALPHA_SATURATE
)

Blend factors.

type CompositeOperation 

type CompositeOperation int

CompositeOperation specify the operation for composition. 

const (
	SourceOver      CompositeOperation = C.NVG_SOURCE_OVER
	SourceIn        CompositeOperation = C.NVG_SOURCE_IN
	SourceOut       CompositeOperation = C.NVG_SOURCE_OUT
	Atop            CompositeOperation = C.NVG_ATOP
	DestinationOver CompositeOperation = C.NVG_DESTINATION_OVER
	DestinationIn   CompositeOperation = C.NVG_DESTINATION_IN
	DestinationOut  CompositeOperation = C.NVG_DESTINATION_OUT
	DestinationAtop CompositeOperation = C.NVG_DESTINATION_ATOP
	Lighter         CompositeOperation = C.NVG_LIGHTER
	Copy            CompositeOperation = C.NVG_COPY
	Xor             CompositeOperation = C.NVG_XOR
)

Composite operations.

type CompositeOperationState 

type CompositeOperationState C.NVGcompositeOperationState

CompositeOperationState records the state of a composition operation.

type Context 

type Context C.NVGcontext

Context is a NanoVGo context for vector graphics rendering.

func CreateContext 

func CreateContext(flags CreateFlag) *Context

CreateContext creates a NanoVGo context for OpenGL 3. flags should be a combination of Antialias, StencilStrokes and Debug.

func (*Context) AddFallbackFont 

func (ctx *Context) AddFallbackFont(baseFont, fallbackFont string)

AddFallbackFont adds a fallback font by its name.

func (*Context) AddFallbackFontID 

func (ctx *Context) AddFallbackFontID(baseFont, fallbackFont *Font)

AddFallbackFontID adds a fallback font by its handle.

func (*Context) Arc 

func (ctx *Context) Arc(x, y, radius, angle0, angle1 float32, direction Winding)

Arc creates a new circle arc shaped sub-path. The arc center is at (x,y), the arc radius is radius, and the arc is drawn from angle angle0 to angle1, and swept in direction direction (CCW or CW).

Angles are specified in radians.

func (*Context) ArcTo 

func (ctx *Context) ArcTo(x1, y1, x2, y2, radius float32)

ArcTo adds an arc segment at the corner defined by the last path point, and two points (x1,y1) and (x2,y2).

func (*Context) BeginFrame 

func (ctx *Context) BeginFrame(windowWidth, windowHeight, devicePixelRatio float32)

BeginFrame begins drawing a new frame.

Calls to NanoVGo drawing API should be wrapped in Context.BeginFrame() and Context.EndFrame(). Context.BeginFrame() defines the size of the window to render to in relation to currently set viewport (i.e. glViewport on GL backends). Device pixel ratio allows to control the rendering on Hi-DPI devices.

For example, GLFW returns two dimensions for an opened window: window size and framebuffer size. In that case you would set windowWidth/Height to the window size, deivcePixelRatio to frameBufferWidth / windowWidth.

func (*Context) BeginPath 

func (ctx *Context) BeginPath()

BeginPath clears the current path and sub-paths.

func (*Context) BezierTo 

func (ctx *Context) BezierTo(c1X, c1Y, c2X, c2Y, x, y float32)

BezierTo adds a cubic bezier segment from the last point in the path via two control points ((c1X,c1Y) and (c2X,c2Y)) to point (x,y).

func (*Context) BoxGradient 

func (ctx *Context) BoxGradient(x, y, width, height, radius, feather float32, innerColor, outerColor color.Color) Paint

BoxGradient creates and returns a box gradient. A box gradient is a feathered rounded rectangle, it is useful for rendering drop shadows or highlights for boxes. Parameters (x,y) define the top-left corner of the rectangle, (width,height) define the size of the rectangle, radius defines the corner radius, and feather defines how blurry the border of the rectangle is. innerColor specifies the inner color and outerColor the outer color of the gradient.

The gradient is transformed by the current transform when it is passed to Context.FillPaint() or Context.StrokePaint().

func (*Context) CancelFrame 

func (ctx *Context) CancelFrame()

CancelFrame cancels drawing the current frame.

func (*Context) Circle 

func (ctx *Context) Circle(x, y, radius float32)

Circle creates a new circle shaped sub-path. The center is at (x,y).

func (*Context) ClosePath 

func (ctx *Context) ClosePath()

ClosePath closes current sub-path with a line segment.

func (*Context) CreateFont 

func (ctx *Context) CreateFont(name, filename string) *Font

CreateFont creates a font by loading it from the disk from filename. Returns a handle to the font.

func (*Context) CreateFontMem 

func (ctx *Context) CreateFontMem(name string, data []uint8, freeData int) *Font

CreateFontMem creates a font by loading it from data, a memory chunk. Returns a handle to the font.

func (*Context) CreateImage 

func (ctx *Context) CreateImage(filename string, imageFlags ImageFlag) *Image

CreateImage creates an image by loading it from the disk from filename. Returns a handle to the image.

func (*Context) CreateImageMem 

func (ctx *Context) CreateImageMem(imageFlags ImageFlag, data []uint8) *Image

CreateImageMem creates an image by loading it from data, a chunk of memory. Returns a handle to the image.

func (*Context) CreateImageRGBA 

func (ctx *Context) CreateImageRGBA(width, height int, imageFlags ImageFlag, data []uint8) *Image

CreateImageRGBA creates an image from data. Returns a handle to the image.

func (*Context) CurrentTransform 

func (ctx *Context) CurrentTransform() [6]float32

CurrentTransform returns the top part (a-f) of the current transformation matrix. 

[a c e]
[b d f]
[0 0 1]

func (*Context) Delete 

func (ctx *Context) Delete()

Delete deletes a NanoVGo context.

func (*Context) Ellipse 

func (ctx *Context) Ellipse(x, y, radiusX, radiusY float32)

Ellipse creates a new ellipse shape sub-path. The center is at (x,y).

func (*Context) EndFrame 

func (ctx *Context) EndFrame()

EndFrame ends drawing and flushes remaining render state.

func (*Context) Fill 

func (ctx *Context) Fill()

Fill fills the current path with the current fill style.

func (*Context) FillColor 

func (ctx *Context) FillColor(color color.Color)

FillColor sets the current fill style to a solid color.

func (*Context) FillPaint 

func (ctx *Context) FillPaint(paint Paint)

FillPaint sets the current fill style to a pint, which can be one of the gradients or a pattern.

func (*Context) FindFont 

func (ctx *Context) FindFont(name string) *Font

FindFont finds a loaded font with name, and returns a handle to it, or nil if the font is not found.

func (*Context) FontBlur 

func (ctx *Context) FontBlur(blur float32)

FontBlur sets the blur of the current text style.

func (*Context) FontFace 

func (ctx *Context) FontFace(font string)

FontFace sets the font face of the current text style by the font name.

func (*Context) FontFaceID 

func (ctx *Context) FontFaceID(font *Font)

FontFaceID sets the font face of the current text style with a font handle.

func (*Context) FontSize 

func (ctx *Context) FontSize(size float32)

FontSize sets the font size of the current text style.

func (*Context) GlobalAlpha 

func (ctx *Context) GlobalAlpha(alpha float32)

GlobalAlpha sets the transparency applied to all rendered shapes.

Already transparent paths will get proportionally more transparent as well.

func (*Context) GlobalCompositeBlendFunc 

func (ctx *Context) GlobalCompositeBlendFunc(sFactor, dFactor BlendFactor)

GlobalCompositeBlendFunc sets the composite operation with custom pixel arithmetic. sFactor and dFactor should be one of BlendFactor.

func (*Context) GlobalCompositeBlendFuncSeparate 

func (ctx *Context) GlobalCompositeBlendFuncSeparate(srcRGB, dstRGB, srcAlpha, dstAlpha BlendFactor)

GlobalCompositeBlendFuncSeparate sets the composite operation with custom pixel arithmetic for RGB and alpha components separately. The parameters should be one of BlendFactor.

func (*Context) GlobalCompositeOperation 

func (ctx *Context) GlobalCompositeOperation(op CompositeOperation)

GlobalCompositeOperation sets the composite operation. op should be one of CompositeOperation.

func (*Context) ImagePattern 

func (ctx *Context) ImagePattern(x, y, imageWidth, imageHeight, angle float32, image *Image, alpha float32) Paint

ImagePattern creates and returns an image pattern. Parameters (x,y) specify the left-top location of the image pattern, (imageWidth,imageHeight) the size of one image, angle rotation around the top-left corner, image is handle to the image to render.

The gradient is transformed by the current transform when it is passed to Context.FillPaint() or Context.StrokePaint().

func (*Context) IntersectScissor 

func (ctx *Context) IntersectScissor(x, y, width, height float32)

IntersectScissor intersects the current scissor rectangle with the specified rectangle. The scissor rectangle is transformed by the current transform.

Note: in case the rotation of previous scissor rect differs from the current one, the intersection will be done between the specified rectangle and the previous scissor rectangle transformed in the current transform space. The resulting shape is always rectangle.

func (*Context) LineCap 

func (ctx *Context) LineCap(cap LineCap)

LineCap sets how the end of the line (cap) is drawn. cap can be one of Butt (default), RoundCap and Square.

func (*Context) LineJoin 

func (ctx *Context) LineJoin(join LineJoin)

LineJoin sets how sharp path corners are drawn. join can be one of Miter (default), RoundJoin and Bevel.

func (*Context) LineTo 

func (ctx *Context) LineTo(x, y float32)

LineTo adds a line segment from the last point in the path to point (x,y).

func (*Context) LinearGradient 

func (ctx *Context) LinearGradient(startX, startY, endX, endY float32, startColor, endColor color.Color) Paint

LinearGradient creates and returns a linear gradient. Parameters (startX,startY)-(endX,endY) specify the start and end coordinates of the linear gradient, startColor specifies the start color and endColor the end color.

The gradient is transformed by the current transform when it is passed to Context.FillPaint() or Context.StrokePaint().

func (*Context) MiterLimit 

func (ctx *Context) MiterLimit(limit float32)

MiterLimit sets the miter limit of the stroke style.

Miter limit controls when a sharp corner is beveled.

func (*Context) MoveTo 

func (ctx *Context) MoveTo(x, y float32)

MoveTo starts a new sub-path with point (x,y) as the first point.

func (*Context) PathWinding 

func (ctx *Context) PathWinding(direction Winding)

PathWinding sets the current sub-path winding, see Winding.

func (*Context) QuadTo 

func (ctx *Context) QuadTo(cX, cY, x, y float32)

QuadTo adds a quadratic bezier segment from the last point in the path via a control point (cX,cY) to point (x,y).

func (*Context) RadialGradient 

func (ctx *Context) RadialGradient(centerX, centerY, innerRadius, outerRadius float32, startColor, endColor color.Color) Paint

RadialGradient creates and returns a radian gradient. Parameters (centerX,centerY) specify the center, innerRadius and outerRadius specify the inner and outer radius of the gradient, startColor specifies the start color and endColor the end color.

The gradient is transformed by the current transform when it is passed to Context.FillPaint() or Context.StrokePaint().

func (*Context) Rect 

func (ctx *Context) Rect(x, y, width, height float32)

Rect creates a new rectangle shaped sub-path.

func (*Context) Reset 

func (ctx *Context) Reset()

Reset resets current render state to default values. This does not affect the render state stack.

func (*Context) ResetScissor 

func (ctx *Context) ResetScissor()

ResetScissor resets and disables scissoring.

func (*Context) ResetTransform 

func (ctx *Context) ResetTransform()

ResetTransform resets the current transform to an indentity matrix.

func (*Context) Restore 

func (ctx *Context) Restore()

Restore pops and restores the current render state.

func (*Context) Rotate 

func (ctx *Context) Rotate(angle float32)

Rotate rotates the current coordinate system. angle is specified in radians.

func (*Context) RoundedRect 

func (ctx *Context) RoundedRect(x, y, width, height, radius float32)

RoundedRect creates a new rounded rectangle shaped sub-path.

func (*Context) RoundedRectVarying 

func (ctx *Context) RoundedRectVarying(x, y, width, height, radiusTopLeft, radiusTopRight, radiusBottomRight, radiusBottomLeft float32)

RoundedRectVarying creates a new rounded rectangle shaped sub-path with varying radii for each corner.

func (*Context) Save 

func (ctx *Context) Save()

Save pushes and saves the current render state into a state stack.

A matching Context.Restore() must be used to restore the state.

func (*Context) Scale 

func (ctx *Context) Scale(x, y float32)

Scale scales the current coordinate system.

func (*Context) Scissor 

func (ctx *Context) Scissor(x, y, width, height float32)

Scissor sets the current scissor rectangle. The scissor rectangle is transformed by the current transform.

func (*Context) ShapeAntialias 

func (ctx *Context) ShapeAntialias(enabled bool)

ShapeAntialias sets whether to draw antialias for Context.Stroke() and Context.Fill(). It's enabled by default.

func (*Context) SkewX 

func (ctx *Context) SkewX(angle float32)

SkewX skews the current coordinate system along the X axis. angle is specified in radians.

func (*Context) SkewY 

func (ctx *Context) SkewY(angle float32)

SkewY skews the current coordinate system along the Y axis. angle is specified in radians.

func (*Context) Stroke 

func (ctx *Context) Stroke()

Stroke strokes the current path with the current stroke style.

func (*Context) StrokeColor 

func (ctx *Context) StrokeColor(color color.Color)

StrokeColor sets the current stroke style to a solid color.

func (*Context) StrokePaint 

func (ctx *Context) StrokePaint(paint Paint)

StrokePaint sets the current stroke style to a paint, which can be one of the gradients or a pattern.

func (*Context) StrokeWidth 

func (ctx *Context) StrokeWidth(size float32)

StrokeWidth sets the stroke width of the stroke style.

func (*Context) Text 

func (ctx *Context) Text(x, y float32, text string)

Text draws text at location (x,y).

func (*Context) TextAlign 

func (ctx *Context) TextAlign(align Align)

TextAlign sets the text align of the current text style, see Align for options.

func (*Context) TextBounds 

func (ctx *Context) TextBounds(x, y float32, text string) (float32, [4]float32)

TextBounds measures the specified text. Returns the horizontal advance of the measured text (i.e. where the next character should be drawn), and the bounding box of the text. The bounds values are [xmin, ymin, xmax, ymax].

Measured values are returned in local coordinate space.

func (*Context) TextBox 

func (ctx *Context) TextBox(x, y, breakRowWidth float32, text string)

TextBox draws multi-line text at location (x,y) wrapped at the width breakRowWidth.

White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered.

Words longer than the max width are split at the nearest character (i.e. no hyphenation).

func (*Context) TextBoxBounds 

func (ctx *Context) TextBoxBounds(x, y, breakRowWidth float32, text string) [4]float32

TextBoxBounds measures the specified multi-line text. Returns the bounding box of the text. The bounds values are [xmin, ymin, xmax, ymax].

Measured values are returned in local coordinate space.

func (*Context) TextBreakLines 

func (ctx *Context) TextBreakLines(text string, breakRowWidth float32, maxRows int) []TextRow

TextBreakLines breaks the text into lines.

White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered.

Words longer than the max width are split at the nearest character (i.e. no hyphenation).

func (*Context) TextGlyphPositions 

func (ctx *Context) TextGlyphPositions(x, y float32, text string, maxPositions int) []GlyphPosition

TextGlyphPositions calculates the glyph x position of text.

Measured values are returned in local coordinate space.

func (*Context) TextLetterSpacing 

func (ctx *Context) TextLetterSpacing(spacing float32)

TextLetterSpacing sets the letter spacing of the current text style.

func (*Context) TextLineHeight 

func (ctx *Context) TextLineHeight(lineHeight float32)

TextLineHeight sets the proportional line height of the current text style. The line height is specified as multiple of font size.

func (*Context) TextMetrics 

func (ctx *Context) TextMetrics() (ascender, descender, lineh float32)

TextMetrics returns the vertical metrics based on the current text style.

Measured values are returned in local coordinate space.

func (*Context) Transform 

func (ctx *Context) Transform(a, b, c, d, e, f float32)

Transform premultiplies the current coordinate system by a matrix.

The parameters are interpreted as a matrix as follows: 

[a c e]
[b d f]
[0 0 1]

func (*Context) Translate 

func (ctx *Context) Translate(x, y float32)

Translate translates the current coordinate system.

type CreateFlag 

type CreateFlag int

CreateFlag is a flag for creating NanoVGo contexts. 

const (
	// Antialias indicates if geometry based anti-aliasing is used (may not be
	// needed when using MSAA).
	Antialias CreateFlag = C.NVG_ANTIALIAS
	// StencilStrokes indicates if strokes should be drawn using stencil buffer.
	// The rendering will be a little slower, but path overlaps (i.e.
	// self-intersecting or sharp turns) will be drawn just once.
	StencilStrokes CreateFlag = C.NVG_STENCIL_STROKES
	// Debug indicates that additional debug checks are done.
	Debug CreateFlag = C.NVG_DEBUG
)

Create flags.

type Font 

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

Font is a handle to a created font.

type GlyphPosition 

type GlyphPosition C.NVGglyphPosition

GlyphPosition is the position of a glyph from an input string.

func (GlyphPosition) MaxX 

func (pos GlyphPosition) MaxX() float32

MaxX returns the bounds of the glyph shape.

func (GlyphPosition) MinX 

func (pos GlyphPosition) MinX() float32

MinX returns the bounds of the glyph shape.

func (GlyphPosition) X 

func (pos GlyphPosition) X() float32

X returns the x-coordinate of the logical glyph position.

type Image 

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

Image is a handle to an loaded image.

func (*Image) Delete 

func (image *Image) Delete()

Delete deletes image.

func (*Image) Size 

func (image *Image) Size() (width, height int)

Size returns the dimensions of image.

func (*Image) UpdateImage 

func (image *Image) UpdateImage(data []uint8)

UpdateImage updates image data.

type ImageFlag 

type ImageFlag int

ImageFlag indicates how images should be processed. 

const (
	ImageGenerateMipmaps ImageFlag = C.NVG_IMAGE_GENERATE_MIPMAPS
	ImageRepeatX         ImageFlag = C.NVG_IMAGE_REPEATX
	ImageRepeatY         ImageFlag = C.NVG_IMAGE_REPEATY
	ImageFlipy           ImageFlag = C.NVG_IMAGE_FLIPY
	ImagePremultiplied   ImageFlag = C.NVG_IMAGE_PREMULTIPLIED
	ImageNearest         ImageFlag = C.NVG_IMAGE_NEAREST
)

Image flags.

type LineCap 

type LineCap int

LineCap specifies the style of line caps. 

const (
	Butt     LineCap = C.NVG_BUTT
	RoundCap LineCap = C.NVG_ROUND
	Square   LineCap = C.NVG_SQUARE
)

Line caps.

type LineJoin 

type LineJoin int

LineJoin specifies the style of sharp path corners. 

const (
	Miter     LineJoin = C.NVG_MITER
	RoundJoin LineJoin = C.NVG_ROUND
	Bevel     LineJoin = C.NVG_BEVEL
)

Line joins.

type Paint 

type Paint C.NVGpaint

Paint is a paint style used for painting.

type TextRow 

type TextRow C.NVGtextRow

TextRow stores the range, width and position of a row of text.

func (TextRow) MaxX 

func (row TextRow) MaxX() float32

MaxX returns the actual bounds of row. Logical width and bounds can differ because of kerning and some parts over extending.

func (TextRow) MinX 

func (row TextRow) MinX() float32

MinX returns the actual bounds of row. Logical width and bounds can differ because of kerning and some parts over extending.

func (TextRow) Next 

func (row TextRow) Next() string

Next returns the remaining text.

func (TextRow) Text 

func (row TextRow) Text() string

Text returns the text of row.

func (TextRow) Width 

func (row TextRow) Width() float32

Width returns the logical width of row.

type Winding 

type Winding int

Winding specifies the direction of winding. 

const (
	// CCW is the winding for solid shapes.
	CCW Winding = C.NVG_CCW
	// CW is the winding for holes.
	CW Winding = C.NVG_CW
)

Windings. 

const (
	// Solid is for CCW.
	Solid Winding = C.NVG_SOLID
	// Hole is for CW.
	Hole Winding = C.NVG_HOLE
)

Solidities.

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