1 files changed, 90 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/code.google.com/p/draw2d/draw2d/dasher.go b/Godeps/_workspace/src/code.google.com/p/draw2d/draw2d/dasher.go
new file mode 100644
index 000000000..521029992
--- /dev/null
+++ b/Godeps/_workspace/src/code.google.com/p/draw2d/draw2d/dasher.go
@@ -0,0 +1,90 @@
+// Copyright 2010 The draw2d Authors. All rights reserved.
+// created: 13/12/2010 by Laurent Le Goff
+
+package draw2d
+
+type DashVertexConverter struct {
+	command        VertexCommand
+	next           VertexConverter
+	x, y, distance float64
+	dash           []float64
+	currentDash    int
+	dashOffset     float64
+}
+
+func NewDashConverter(dash []float64, dashOffset float64, converter VertexConverter) *DashVertexConverter {
+	var dasher DashVertexConverter
+	dasher.dash = dash
+	dasher.currentDash = 0
+	dasher.dashOffset = dashOffset
+	dasher.next = converter
+	return &dasher
+}
+
+func (dasher *DashVertexConverter) NextCommand(cmd VertexCommand) {
+	dasher.command = cmd
+	if dasher.command == VertexStopCommand {
+		dasher.next.NextCommand(VertexStopCommand)
+	}
+}
+
+func (dasher *DashVertexConverter) Vertex(x, y float64) {
+	switch dasher.command {
+	case VertexStartCommand:
+		dasher.start(x, y)
+	default:
+		dasher.lineTo(x, y)
+	}
+	dasher.command = VertexNoCommand
+}
+
+func (dasher *DashVertexConverter) start(x, y float64) {
+	dasher.next.NextCommand(VertexStartCommand)
+	dasher.next.Vertex(x, y)
+	dasher.x, dasher.y = x, y
+	dasher.distance = dasher.dashOffset
+	dasher.currentDash = 0
+}
+
+func (dasher *DashVertexConverter) lineTo(x, y float64) {
+	rest := dasher.dash[dasher.currentDash] - dasher.distance
+	for rest < 0 {
+		dasher.distance = dasher.distance - dasher.dash[dasher.currentDash]
+		dasher.currentDash = (dasher.currentDash + 1) % len(dasher.dash)
+		rest = dasher.dash[dasher.currentDash] - dasher.distance
+	}
+	d := distance(dasher.x, dasher.y, x, y)
+	for d >= rest {
+		k := rest / d
+		lx := dasher.x + k*(x-dasher.x)
+		ly := dasher.y + k*(y-dasher.y)
+		if dasher.currentDash%2 == 0 {
+			// line
+			dasher.next.Vertex(lx, ly)
+		} else {
+			// gap
+			dasher.next.NextCommand(VertexStopCommand)
+			dasher.next.NextCommand(VertexStartCommand)
+			dasher.next.Vertex(lx, ly)
+		}
+		d = d - rest
+		dasher.x, dasher.y = lx, ly
+		dasher.currentDash = (dasher.currentDash + 1) % len(dasher.dash)
+		rest = dasher.dash[dasher.currentDash]
+	}
+	dasher.distance = d
+	if dasher.currentDash%2 == 0 {
+		// line
+		dasher.next.Vertex(x, y)
+	} else {
+		// gap
+		dasher.next.NextCommand(VertexStopCommand)
+		dasher.next.NextCommand(VertexStartCommand)
+		dasher.next.Vertex(x, y)
+	}
+	if dasher.distance >= dasher.dash[dasher.currentDash] {
+		dasher.distance = dasher.distance - dasher.dash[dasher.currentDash]
+		dasher.currentDash = (dasher.currentDash + 1) % len(dasher.dash)
+	}
+	dasher.x, dasher.y = x, y
+}