draw2d/path_adder.go
Stani d47e08f7c9 Preparing for pdf backend
- make PathStorage Commands and Vertices public, so they can be accessed by the pdf backend
- start every path with MoveTo (also before ArcTo)
2015-06-27 01:03:41 +02:00

70 lines
2.4 KiB
Go

// Copyright 2010 The draw2d Authors. All rights reserved.
// created: 13/12/2010 by Laurent Le Goff
package draw2d
import (
"code.google.com/p/freetype-go/freetype/raster"
)
type VertexAdder struct {
command VertexCommand
adder raster.Adder
}
func NewVertexAdder(adder raster.Adder) *VertexAdder {
return &VertexAdder{VertexNoCommand, adder}
}
func (vertexAdder *VertexAdder) NextCommand(cmd VertexCommand) {
vertexAdder.command = cmd
}
func (vertexAdder *VertexAdder) Vertex(x, y float64) {
switch vertexAdder.command {
case VertexStartCommand:
vertexAdder.adder.Start(raster.Point{raster.Fix32(x * 256), raster.Fix32(y * 256)})
default:
vertexAdder.adder.Add1(raster.Point{raster.Fix32(x * 256), raster.Fix32(y * 256)})
}
vertexAdder.command = VertexNoCommand
}
type PathAdder struct {
adder raster.Adder
firstPoint raster.Point
ApproximationScale float64
}
func NewPathAdder(adder raster.Adder) *PathAdder {
return &PathAdder{adder, raster.Point{0, 0}, 1}
}
func (pathAdder *PathAdder) Convert(paths ...*PathStorage) {
for _, path := range paths {
j := 0
for _, cmd := range path.Commands {
switch cmd {
case MoveTo:
pathAdder.firstPoint = raster.Point{raster.Fix32(path.Vertices[j] * 256), raster.Fix32(path.Vertices[j+1] * 256)}
pathAdder.adder.Start(pathAdder.firstPoint)
j += 2
case LineTo:
pathAdder.adder.Add1(raster.Point{raster.Fix32(path.Vertices[j] * 256), raster.Fix32(path.Vertices[j+1] * 256)})
j += 2
case QuadCurveTo:
pathAdder.adder.Add2(raster.Point{raster.Fix32(path.Vertices[j] * 256), raster.Fix32(path.Vertices[j+1] * 256)}, raster.Point{raster.Fix32(path.Vertices[j+2] * 256), raster.Fix32(path.Vertices[j+3] * 256)})
j += 4
case CubicCurveTo:
pathAdder.adder.Add3(raster.Point{raster.Fix32(path.Vertices[j] * 256), raster.Fix32(path.Vertices[j+1] * 256)}, raster.Point{raster.Fix32(path.Vertices[j+2] * 256), raster.Fix32(path.Vertices[j+3] * 256)}, raster.Point{raster.Fix32(path.Vertices[j+4] * 256), raster.Fix32(path.Vertices[j+5] * 256)})
j += 6
case ArcTo:
lastPoint := arcAdder(pathAdder.adder, path.Vertices[j], path.Vertices[j+1], path.Vertices[j+2], path.Vertices[j+3], path.Vertices[j+4], path.Vertices[j+5], pathAdder.ApproximationScale)
pathAdder.adder.Add1(lastPoint)
j += 6
case Close:
pathAdder.adder.Add1(pathAdder.firstPoint)
}
}
}
}