draw2d/stack_gc.go

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// Copyright 2010 The draw2d Authors. All rights reserved.
// created: 21/11/2010 by Laurent Le Goff
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package draw2d
import (
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"github.com/llgcode/draw2d/path"
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"image"
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"image/color"
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"code.google.com/p/freetype-go/freetype/truetype"
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)
type StackGraphicContext struct {
Current *ContextStack
}
type ContextStack struct {
Tr MatrixTransform
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Path *path.Path
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LineWidth float64
Dash []float64
DashOffset float64
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StrokeColor color.Color
FillColor color.Color
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FillRule FillRule
Cap path.Cap
Join path.Join
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FontSize float64
FontData FontData
font *truetype.Font
// fontSize and dpi are used to calculate scale. scale is the number of
// 26.6 fixed point units in 1 em.
scale int32
previous *ContextStack
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}
/**
* Create a new Graphic context from an image
*/
func NewStackGraphicContext() *StackGraphicContext {
gc := &StackGraphicContext{}
gc.Current = new(ContextStack)
gc.Current.Tr = NewIdentityMatrix()
gc.Current.Path = new(path.Path)
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gc.Current.LineWidth = 1.0
gc.Current.StrokeColor = image.Black
gc.Current.FillColor = image.White
gc.Current.Cap = path.RoundCap
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gc.Current.FillRule = FillRuleEvenOdd
gc.Current.Join = path.RoundJoin
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gc.Current.FontSize = 10
gc.Current.FontData = defaultFontData
return gc
}
func (gc *StackGraphicContext) GetMatrixTransform() MatrixTransform {
return gc.Current.Tr
}
func (gc *StackGraphicContext) SetMatrixTransform(Tr MatrixTransform) {
gc.Current.Tr = Tr
}
func (gc *StackGraphicContext) ComposeMatrixTransform(Tr MatrixTransform) {
gc.Current.Tr = Tr.Multiply(gc.Current.Tr)
}
func (gc *StackGraphicContext) Rotate(angle float64) {
gc.Current.Tr = NewRotationMatrix(angle).Multiply(gc.Current.Tr)
}
func (gc *StackGraphicContext) Translate(tx, ty float64) {
gc.Current.Tr = NewTranslationMatrix(tx, ty).Multiply(gc.Current.Tr)
}
func (gc *StackGraphicContext) Scale(sx, sy float64) {
gc.Current.Tr = NewScaleMatrix(sx, sy).Multiply(gc.Current.Tr)
}
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func (gc *StackGraphicContext) SetStrokeColor(c color.Color) {
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gc.Current.StrokeColor = c
}
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func (gc *StackGraphicContext) SetFillColor(c color.Color) {
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gc.Current.FillColor = c
}
func (gc *StackGraphicContext) SetFillRule(f FillRule) {
gc.Current.FillRule = f
}
func (gc *StackGraphicContext) SetLineWidth(LineWidth float64) {
gc.Current.LineWidth = LineWidth
}
func (gc *StackGraphicContext) SetLineCap(cap path.Cap) {
gc.Current.Cap = cap
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}
func (gc *StackGraphicContext) SetLineJoin(join path.Join) {
gc.Current.Join = join
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}
func (gc *StackGraphicContext) SetLineDash(Dash []float64, DashOffset float64) {
gc.Current.Dash = Dash
gc.Current.DashOffset = DashOffset
}
func (gc *StackGraphicContext) SetFontSize(FontSize float64) {
gc.Current.FontSize = FontSize
}
func (gc *StackGraphicContext) GetFontSize() float64 {
return gc.Current.FontSize
}
func (gc *StackGraphicContext) SetFontData(FontData FontData) {
gc.Current.FontData = FontData
}
func (gc *StackGraphicContext) GetFontData() FontData {
return gc.Current.FontData
}
func (gc *StackGraphicContext) BeginPath() {
gc.Current.Path.Clear()
}
func (gc *StackGraphicContext) IsEmpty() bool {
return gc.Current.Path.IsEmpty()
}
func (gc *StackGraphicContext) LastPoint() (float64, float64) {
return gc.Current.Path.LastPoint()
}
func (gc *StackGraphicContext) MoveTo(x, y float64) {
gc.Current.Path.MoveTo(x, y)
}
func (gc *StackGraphicContext) LineTo(x, y float64) {
gc.Current.Path.LineTo(x, y)
}
func (gc *StackGraphicContext) QuadCurveTo(cx, cy, x, y float64) {
gc.Current.Path.QuadCurveTo(cx, cy, x, y)
}
func (gc *StackGraphicContext) CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64) {
gc.Current.Path.CubicCurveTo(cx1, cy1, cx2, cy2, x, y)
}
func (gc *StackGraphicContext) ArcTo(cx, cy, rx, ry, startAngle, angle float64) {
gc.Current.Path.ArcTo(cx, cy, rx, ry, startAngle, angle)
}
func (gc *StackGraphicContext) Close() {
gc.Current.Path.Close()
}
func (gc *StackGraphicContext) Save() {
context := new(ContextStack)
context.FontSize = gc.Current.FontSize
context.FontData = gc.Current.FontData
context.LineWidth = gc.Current.LineWidth
context.StrokeColor = gc.Current.StrokeColor
context.FillColor = gc.Current.FillColor
context.FillRule = gc.Current.FillRule
context.Dash = gc.Current.Dash
context.DashOffset = gc.Current.DashOffset
context.Cap = gc.Current.Cap
context.Join = gc.Current.Join
context.Path = gc.Current.Path.Copy()
context.font = gc.Current.font
context.scale = gc.Current.scale
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copy(context.Tr[:], gc.Current.Tr[:])
context.previous = gc.Current
gc.Current = context
}
func (gc *StackGraphicContext) Restore() {
if gc.Current.previous != nil {
oldContext := gc.Current
gc.Current = gc.Current.previous
oldContext.previous = nil
}
}