draw2d

package
v0.0.0-...-a53a016 Latest Latest
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 Go to latest Published: Mar 31, 2015 License: BSD-2-Clause Imports: 11 Imported by: 4

Documentation

Overview

The package draw2d provide a Graphic Context that can draw vectorial figure on surface.

Index

Constants

View Source 
const M = 1<<16 - 1

Variables

View Source 
var (
	CurveRecursionLimit        = 32
	CurveCollinearityEpsilon   = 1e-30
	CurveAngleToleranceEpsilon = 0.01
)

Functions

func Circle 

func Circle(path Path, cx, cy, radius float64)

func DrawImage 

func DrawImage(src image.Image, dest draw.Image, tr MatrixTransform, op draw.Op, filter ImageFilter)

func Ellipse 

func Ellipse(path Path, cx, cy, rx, ry float64)

func GetFont 

func GetFont(fontData FontData) *truetype.Font

func GetFontFolder 

func GetFontFolder() string

func Rect 

func Rect(path Path, x1, y1, x2, y2 float64)

func RegisterFont 

func RegisterFont(fontData FontData, font *truetype.Font)

func RoundRect 

func RoundRect(path Path, x1, y1, x2, y2, arcWidth, arcHeight float64)

func SetFontFolder 

func SetFontFolder(folder string)

Types

type Cap 

type Cap int
const (
	RoundCap Cap = iota
	ButtCap
	SquareCap
)

func (Cap) Convert 

func (c Cap) Convert() raster.Capper

type ContextStack 

type ContextStack struct {
	Tr          MatrixTransform
	Path        *PathStorage
	LineWidth   float64
	Dash        []float64
	DashOffset  float64
	StrokeColor color.Color
	FillColor   color.Color
	FillRule    FillRule
	Cap         Cap
	Join        Join
	FontSize    float64
	FontData    FontData
	// contains filtered or unexported fields
}

type DashVertexConverter 

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

func NewDashConverter 

func NewDashConverter(dash []float64, dashOffset float64, converter VertexConverter) *DashVertexConverter

func (*DashVertexConverter) NextCommand 

func (dasher *DashVertexConverter) NextCommand(cmd VertexCommand)

func (*DashVertexConverter) Vertex 

func (dasher *DashVertexConverter) Vertex(x, y float64)

type DemuxConverter 

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

func NewDemuxConverter 

func NewDemuxConverter(converters ...VertexConverter) *DemuxConverter

func (*DemuxConverter) NextCommand 

func (dc *DemuxConverter) NextCommand(cmd VertexCommand)

func (*DemuxConverter) Vertex 

func (dc *DemuxConverter) Vertex(x, y float64)

type FillRule 

type FillRule int
const (
	FillRuleEvenOdd FillRule = iota
	FillRuleWinding
)

func (FillRule) UseNonZeroWinding 

func (f FillRule) UseNonZeroWinding() bool

type FontData 

type FontData struct {
	Name   string
	Family FontFamily
	Style  FontStyle
}

type FontFamily 

type FontFamily byte
const (
	FontFamilySans FontFamily = iota
	FontFamilySerif
	FontFamilyMono
)

type FontStyle 

type FontStyle byte
const (
	FontStyleNormal FontStyle = iota
	FontStyleBold
	FontStyleItalic
)

type GraphicContext 

type GraphicContext interface {
	Path
	// Create a new path
	BeginPath()
	GetMatrixTransform() MatrixTransform
	SetMatrixTransform(tr MatrixTransform)
	ComposeMatrixTransform(tr MatrixTransform)
	Rotate(angle float64)
	Translate(tx, ty float64)
	Scale(sx, sy float64)
	SetStrokeColor(c color.Color)
	SetFillColor(c color.Color)
	SetFillRule(f FillRule)
	SetLineWidth(lineWidth float64)
	SetLineCap(cap Cap)
	SetLineJoin(join Join)
	SetLineDash(dash []float64, dashOffset float64)
	SetFontSize(fontSize float64)
	GetFontSize() float64
	SetFontData(fontData FontData)
	GetFontData() FontData
	DrawImage(image image.Image)
	Save()
	Restore()
	Clear()
	ClearRect(x1, y1, x2, y2 int)
	SetDPI(dpi int)
	GetDPI() int
	GetStringBounds(s string) (left, top, right, bottom float64)
	CreateStringPath(text string, x, y float64) (cursor float64)
	FillString(text string) (cursor float64)
	FillStringAt(text string, x, y float64) (cursor float64)
	StrokeString(text string) (cursor float64)
	StrokeStringAt(text string, x, y float64) (cursor float64)
	Stroke(paths ...*PathStorage)
	Fill(paths ...*PathStorage)
	FillStroke(paths ...*PathStorage)
}

type ImageFilter 

type ImageFilter int
const (
	LinearFilter ImageFilter = iota
	BilinearFilter
	BicubicFilter
)

type ImageGraphicContext 

type ImageGraphicContext struct {
	*StackGraphicContext

	DPI int
	// contains filtered or unexported fields
}

func NewGraphicContext 

func NewGraphicContext(img draw.Image) *ImageGraphicContext

*

  • Create a new Graphic context from an image

func NewGraphicContextWithPainter 

func NewGraphicContextWithPainter(img draw.Image, painter Painter) *ImageGraphicContext

Create a new Graphic context from an image and a Painter (see Freetype-go)

func (*ImageGraphicContext) Clear 

func (gc *ImageGraphicContext) Clear()

func (*ImageGraphicContext) ClearRect 

func (gc *ImageGraphicContext) ClearRect(x1, y1, x2, y2 int)

func (*ImageGraphicContext) CreateStringPath 

func (gc *ImageGraphicContext) CreateStringPath(s string, x, y float64) float64

CreateStringPath creates a path from the string s at x, y, and returns the string width. The text is placed so that the left edge of the em square of the first character of s and the baseline intersect at x, y. The majority of the affected pixels will be above and to the right of the point, but some may be below or to the left. For example, drawing a string that starts with a 'J' in an italic font may affect pixels below and left of the point.

func (*ImageGraphicContext) DrawImage 

func (gc *ImageGraphicContext) DrawImage(img image.Image)

func (*ImageGraphicContext) Fill 

func (gc *ImageGraphicContext) Fill(paths ...*PathStorage)

*** second method ***

func (*ImageGraphicContext) FillString 

func (gc *ImageGraphicContext) FillString(text string) (cursor float64)

func (*ImageGraphicContext) FillStringAt 

func (gc *ImageGraphicContext) FillStringAt(text string, x, y float64) (cursor float64)

func (*ImageGraphicContext) FillStroke 

func (gc *ImageGraphicContext) FillStroke(paths ...*PathStorage)

second method

func (*ImageGraphicContext) GetDPI 

func (gc *ImageGraphicContext) GetDPI() int

func (*ImageGraphicContext) GetStringBounds 

func (gc *ImageGraphicContext) GetStringBounds(s string) (left, top, right, bottom float64)

GetStringBounds returns the approximate pixel bounds of the string s at x, y. The the left edge of the em square of the first character of s and the baseline intersect at 0, 0 in the returned coordinates. Therefore the top and left coordinates may well be negative.

func (*ImageGraphicContext) SetDPI 

func (gc *ImageGraphicContext) SetDPI(dpi int)

SetDPI sets the screen resolution in dots per inch.

func (*ImageGraphicContext) SetFont 

func (gc *ImageGraphicContext) SetFont(font *truetype.Font)

SetFont sets the font used to draw text.

func (*ImageGraphicContext) SetFontSize 

func (gc *ImageGraphicContext) SetFontSize(fontSize float64)

SetFontSize sets the font size in points (as in “a 12 point font”).

func (*ImageGraphicContext) Stroke 

func (gc *ImageGraphicContext) Stroke(paths ...*PathStorage)

*** second method ***

func (*ImageGraphicContext) StrokeString 

func (gc *ImageGraphicContext) StrokeString(text string) (cursor float64)

func (*ImageGraphicContext) StrokeStringAt 

func (gc *ImageGraphicContext) StrokeStringAt(text string, x, y float64) (cursor float64)

type Join 

type Join int
const (
	BevelJoin Join = iota
	RoundJoin
	MiterJoin
)

func (Join) Convert 

func (j Join) Convert() raster.Joiner

type LineStroker 

type LineStroker struct {
	Next          VertexConverter
	HalfLineWidth float64
	Cap           Cap
	Join          Join
	// contains filtered or unexported fields
}

func NewLineStroker 

func NewLineStroker(c Cap, j Join, converter VertexConverter) *LineStroker

func (*LineStroker) NextCommand 

func (l *LineStroker) NextCommand(command VertexCommand)

func (*LineStroker) Vertex 

func (l *LineStroker) Vertex(x, y float64)

type MatrixTransform 

type MatrixTransform [6]float64

func NewIdentityMatrix 

func NewIdentityMatrix() MatrixTransform

* Creates an identity transformation.

func NewMatrixTransform 

func NewMatrixTransform(rectangle1, rectangle2 [4]float64) MatrixTransform

*

  • Creates a transformation, combining a scale and a translation, that transform rectangle1 into rectangle2.

func NewRotationMatrix 

func NewRotationMatrix(angle float64) MatrixTransform

*

  • Creates a rotation transformation.

func NewScaleMatrix 

func NewScaleMatrix(sx, sy float64) MatrixTransform

*

  • Creates a transformation with a sx, sy scale factor

func NewTranslationMatrix 

func NewTranslationMatrix(tx, ty float64) MatrixTransform

*

  • Creates a transformation with a translation, that,
  • transform point1 into point2.

func (MatrixTransform) Determinant 

func (tr MatrixTransform) Determinant() float64

func (MatrixTransform) Equals 

func (tr1 MatrixTransform) Equals(tr2 MatrixTransform) bool

*

  • Tests if a two transformation are equal. A tolerance is applied when
  • comparing matrix elements.

func (MatrixTransform) GetInverseTransformation 

func (tr MatrixTransform) GetInverseTransformation() MatrixTransform

*

  • Returns a transformation that is the inverse of the given transformation.

func (MatrixTransform) GetMaxAbsScaling 

func (tr MatrixTransform) GetMaxAbsScaling() (s float64)

func (MatrixTransform) GetMinAbsScaling 

func (tr MatrixTransform) GetMinAbsScaling() (s float64)

func (MatrixTransform) GetScale 

func (tr MatrixTransform) GetScale() float64

func (MatrixTransform) GetScaling 

func (tr MatrixTransform) GetScaling() (x, y float64)

func (MatrixTransform) GetTranslation 

func (tr MatrixTransform) GetTranslation() (x, y float64)

func (MatrixTransform) InverseTransform 

func (tr MatrixTransform) InverseTransform(points ...*float64)

func (MatrixTransform) IsIdentity 

func (tr MatrixTransform) IsIdentity() bool

*

  • Tests if a transformation is the identity transformation. A tolerance
  • is applied when comparing matrix elements.

func (MatrixTransform) IsTranslation 

func (tr MatrixTransform) IsTranslation() bool

*

  • Tests if a transformation is is a pure translation. A tolerance
  • is applied when comparing matrix elements.

func (MatrixTransform) Multiply 

func (tr1 MatrixTransform) Multiply(tr2 MatrixTransform) MatrixTransform

func (*MatrixTransform) Rotate 

func (tr *MatrixTransform) Rotate(angle float64) *MatrixTransform

func (*MatrixTransform) Scale 

func (tr *MatrixTransform) Scale(sx, sy float64) *MatrixTransform

func (MatrixTransform) Transform 

func (tr MatrixTransform) Transform(points ...*float64)

func (MatrixTransform) TransformArray 

func (tr MatrixTransform) TransformArray(points []float64)

func (MatrixTransform) TransformRasterPoint 

func (tr MatrixTransform) TransformRasterPoint(points ...*raster.Point)

func (MatrixTransform) TransformRectangle 

func (tr MatrixTransform) TransformRectangle(x0, y0, x2, y2 *float64)

func (*MatrixTransform) Translate 

func (tr *MatrixTransform) Translate(tx, ty float64) *MatrixTransform

func (MatrixTransform) VectorTransform 

func (tr MatrixTransform) VectorTransform(points ...*float64)

type MatrixTransformAdder 

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

this adder apply a Matrix transformation to points

func NewMatrixTransformAdder 

func NewMatrixTransformAdder(tr MatrixTransform, adder raster.Adder) *MatrixTransformAdder

func (MatrixTransformAdder) Add1 

func (mta MatrixTransformAdder) Add1(b raster.Point)

Add1 adds a linear segment to the current curve.

func (MatrixTransformAdder) Add2 

func (mta MatrixTransformAdder) Add2(b, c raster.Point)

Add2 adds a quadratic segment to the current curve.

func (MatrixTransformAdder) Add3 

func (mta MatrixTransformAdder) Add3(b, c, d raster.Point)

Add3 adds a cubic segment to the current curve.

func (MatrixTransformAdder) Start 

func (mta MatrixTransformAdder) Start(a raster.Point)

Start starts a new curve at the given point.

type Painter 

type Painter interface {
	raster.Painter
	SetColor(color color.Color)
}

type Path 

type Path interface {
	// Return the current point of the path
	LastPoint() (x, y float64)
	// Create a new subpath that start at the specified point
	MoveTo(x, y float64)
	// Create a new subpath that start at the specified point
	// relative to the current point
	RMoveTo(dx, dy float64)
	// Add a line to the current subpath
	LineTo(x, y float64)
	// Add a line to the current subpath
	// relative to the current point
	RLineTo(dx, dy float64)

	QuadCurveTo(cx, cy, x, y float64)
	RQuadCurveTo(dcx, dcy, dx, dy float64)
	CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64)
	RCubicCurveTo(dcx1, dcy1, dcx2, dcy2, dx, dy float64)
	ArcTo(cx, cy, rx, ry, startAngle, angle float64)
	RArcTo(dcx, dcy, rx, ry, startAngle, angle float64)
	Close()
}

type PathAdder 

type PathAdder struct {
	ApproximationScale float64
	// contains filtered or unexported fields
}

func NewPathAdder 

func NewPathAdder(adder raster.Adder) *PathAdder

func (*PathAdder) Convert 

func (pathAdder *PathAdder) Convert(paths ...*PathStorage)

type PathCmd 

type PathCmd int
const (
	MoveTo PathCmd = iota
	LineTo
	QuadCurveTo
	CubicCurveTo
	ArcTo
	Close
)

type PathConverter 

type PathConverter struct {
	ApproximationScale, AngleTolerance, CuspLimit float64
	// contains filtered or unexported fields
}

func NewPathConverter 

func NewPathConverter(converter VertexConverter) *PathConverter

func (*PathConverter) ArcTo 

func (c *PathConverter) ArcTo(cx, cy, rx, ry, startAngle, angle float64) *PathConverter

func (*PathConverter) Close 

func (c *PathConverter) Close() *PathConverter

func (*PathConverter) Convert 

func (c *PathConverter) Convert(paths ...*PathStorage)

func (*PathConverter) ConvertCommand 

func (c *PathConverter) ConvertCommand(cmd PathCmd, vertices ...float64) int

func (*PathConverter) CubicCurveTo 

func (c *PathConverter) CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64) *PathConverter

func (*PathConverter) LineTo 

func (c *PathConverter) LineTo(x, y float64) *PathConverter

func (*PathConverter) MoveTo 

func (c *PathConverter) MoveTo(x, y float64) *PathConverter

func (*PathConverter) QuadCurveTo 

func (c *PathConverter) QuadCurveTo(cx, cy, x, y float64) *PathConverter

func (*PathConverter) RArcTo 

func (c *PathConverter) RArcTo(dcx, dcy, rx, ry, startAngle, angle float64) *PathConverter

func (*PathConverter) RCubicCurveTo 

func (c *PathConverter) RCubicCurveTo(dcx1, dcy1, dcx2, dcy2, dx, dy float64) *PathConverter

func (*PathConverter) RLineTo 

func (c *PathConverter) RLineTo(dx, dy float64) *PathConverter

func (*PathConverter) RMoveTo 

func (c *PathConverter) RMoveTo(dx, dy float64) *PathConverter

func (*PathConverter) RQuadCurveTo 

func (c *PathConverter) RQuadCurveTo(dcx, dcy, dx, dy float64) *PathConverter

type PathStorage 

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

func NewPathStorage 

func NewPathStorage() (p *PathStorage)

func (*PathStorage) ArcTo 

func (p *PathStorage) ArcTo(cx, cy, rx, ry, startAngle, angle float64) *PathStorage

func (*PathStorage) Clear 

func (p *PathStorage) Clear()

func (*PathStorage) Close 

func (p *PathStorage) Close() *PathStorage

func (*PathStorage) Copy 

func (src *PathStorage) Copy() (dest *PathStorage)

func (*PathStorage) CubicCurveTo 

func (p *PathStorage) CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64) *PathStorage

func (*PathStorage) IsEmpty 

func (p *PathStorage) IsEmpty() bool

func (*PathStorage) LastPoint 

func (p *PathStorage) LastPoint() (x, y float64)

func (*PathStorage) LineTo 

func (p *PathStorage) LineTo(x, y float64) *PathStorage

func (*PathStorage) MoveTo 

func (p *PathStorage) MoveTo(x, y float64) *PathStorage

func (*PathStorage) QuadCurveTo 

func (p *PathStorage) QuadCurveTo(cx, cy, x, y float64) *PathStorage

func (*PathStorage) RArcTo 

func (p *PathStorage) RArcTo(dcx, dcy, rx, ry, startAngle, angle float64) *PathStorage

func (*PathStorage) RCubicCurveTo 

func (p *PathStorage) RCubicCurveTo(dcx1, dcy1, dcx2, dcy2, dx, dy float64) *PathStorage

func (*PathStorage) RLineTo 

func (p *PathStorage) RLineTo(dx, dy float64) *PathStorage

func (*PathStorage) RMoveTo 

func (p *PathStorage) RMoveTo(dx, dy float64) *PathStorage

func (*PathStorage) RQuadCurveTo 

func (p *PathStorage) RQuadCurveTo(dcx, dcy, dx, dy float64) *PathStorage

func (*PathStorage) String 

func (p *PathStorage) String() string

type StackGraphicContext 

type StackGraphicContext struct {
	Current *ContextStack
}

func NewStackGraphicContext 

func NewStackGraphicContext() *StackGraphicContext

*

  • Create a new Graphic context from an image

func (*StackGraphicContext) ArcTo 

func (gc *StackGraphicContext) ArcTo(cx, cy, rx, ry, startAngle, angle float64)

func (*StackGraphicContext) BeginPath 

func (gc *StackGraphicContext) BeginPath()

func (*StackGraphicContext) Close 

func (gc *StackGraphicContext) Close()

func (*StackGraphicContext) ComposeMatrixTransform 

func (gc *StackGraphicContext) ComposeMatrixTransform(Tr MatrixTransform)

func (*StackGraphicContext) CubicCurveTo 

func (gc *StackGraphicContext) CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64)

func (*StackGraphicContext) GetFontData 

func (gc *StackGraphicContext) GetFontData() FontData

func (*StackGraphicContext) GetFontSize 

func (gc *StackGraphicContext) GetFontSize() float64

func (*StackGraphicContext) GetMatrixTransform 

func (gc *StackGraphicContext) GetMatrixTransform() MatrixTransform

func (*StackGraphicContext) IsEmpty 

func (gc *StackGraphicContext) IsEmpty() bool

func (*StackGraphicContext) LastPoint 

func (gc *StackGraphicContext) LastPoint() (float64, float64)

func (*StackGraphicContext) LineTo 

func (gc *StackGraphicContext) LineTo(x, y float64)

func (*StackGraphicContext) MoveTo 

func (gc *StackGraphicContext) MoveTo(x, y float64)

func (*StackGraphicContext) QuadCurveTo 

func (gc *StackGraphicContext) QuadCurveTo(cx, cy, x, y float64)

func (*StackGraphicContext) RArcTo 

func (gc *StackGraphicContext) RArcTo(dcx, dcy, rx, ry, startAngle, angle float64)

func (*StackGraphicContext) RCubicCurveTo 

func (gc *StackGraphicContext) RCubicCurveTo(dcx1, dcy1, dcx2, dcy2, dx, dy float64)

func (*StackGraphicContext) RLineTo 

func (gc *StackGraphicContext) RLineTo(dx, dy float64)

func (*StackGraphicContext) RMoveTo 

func (gc *StackGraphicContext) RMoveTo(dx, dy float64)

func (*StackGraphicContext) RQuadCurveTo 

func (gc *StackGraphicContext) RQuadCurveTo(dcx, dcy, dx, dy float64)

func (*StackGraphicContext) Restore 

func (gc *StackGraphicContext) Restore()

func (*StackGraphicContext) Rotate 

func (gc *StackGraphicContext) Rotate(angle float64)

func (*StackGraphicContext) Save 

func (gc *StackGraphicContext) Save()

func (*StackGraphicContext) Scale 

func (gc *StackGraphicContext) Scale(sx, sy float64)

func (*StackGraphicContext) SetFillColor 

func (gc *StackGraphicContext) SetFillColor(c color.Color)

func (*StackGraphicContext) SetFillRule 

func (gc *StackGraphicContext) SetFillRule(f FillRule)

func (*StackGraphicContext) SetFontData 

func (gc *StackGraphicContext) SetFontData(FontData FontData)

func (*StackGraphicContext) SetFontSize 

func (gc *StackGraphicContext) SetFontSize(FontSize float64)

func (*StackGraphicContext) SetLineCap 

func (gc *StackGraphicContext) SetLineCap(Cap Cap)

func (*StackGraphicContext) SetLineDash 

func (gc *StackGraphicContext) SetLineDash(Dash []float64, DashOffset float64)

func (*StackGraphicContext) SetLineJoin 

func (gc *StackGraphicContext) SetLineJoin(Join Join)

func (*StackGraphicContext) SetLineWidth 

func (gc *StackGraphicContext) SetLineWidth(LineWidth float64)

func (*StackGraphicContext) SetMatrixTransform 

func (gc *StackGraphicContext) SetMatrixTransform(Tr MatrixTransform)

func (*StackGraphicContext) SetStrokeColor 

func (gc *StackGraphicContext) SetStrokeColor(c color.Color)

func (*StackGraphicContext) Translate 

func (gc *StackGraphicContext) Translate(tx, ty float64)

type VertexAdder 

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

func NewVertexAdder 

func NewVertexAdder(adder raster.Adder) *VertexAdder

func (*VertexAdder) NextCommand 

func (vertexAdder *VertexAdder) NextCommand(cmd VertexCommand)

func (*VertexAdder) Vertex 

func (vertexAdder *VertexAdder) Vertex(x, y float64)

type VertexCommand 

type VertexCommand byte
const (
	VertexNoCommand VertexCommand = iota
	VertexStartCommand
	VertexJoinCommand
	VertexCloseCommand
	VertexStopCommand
)

type VertexConverter 

type VertexConverter interface {
	NextCommand(cmd VertexCommand)
	Vertex(x, y float64)
}

type VertexMatrixTransform 

type VertexMatrixTransform struct {
	Next VertexConverter
	// contains filtered or unexported fields
}

this VertexConverter apply the Matrix transformation tr

func NewVertexMatrixTransform 

func NewVertexMatrixTransform(tr MatrixTransform, converter VertexConverter) *VertexMatrixTransform

func (*VertexMatrixTransform) NextCommand 

func (vmt *VertexMatrixTransform) NextCommand(command VertexCommand)

Vertex Matrix Transform

func (*VertexMatrixTransform) Vertex 

func (vmt *VertexMatrixTransform) Vertex(x, y float64)

Source Files

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