1 files changed, 51 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/code.google.com/p/draw2d/draw2d/curve/quad_float64.go b/Godeps/_workspace/src/code.google.com/p/draw2d/draw2d/curve/quad_float64.go
new file mode 100644
index 000000000..bd72affbb
--- /dev/null
+++ b/Godeps/_workspace/src/code.google.com/p/draw2d/draw2d/curve/quad_float64.go
@@ -0,0 +1,51 @@
+// Copyright 2010 The draw2d Authors. All rights reserved.
+// created: 17/05/2011 by Laurent Le Goff
+package curve
+
+import (
+	"math"
+)
+
+//X1, Y1, X2, Y2, X3, Y3 float64
+type QuadCurveFloat64 [6]float64
+
+func (c *QuadCurveFloat64) Subdivide(c1, c2 *QuadCurveFloat64) {
+	// Calculate all the mid-points of the line segments
+	//----------------------
+	c1[0], c1[1] = c[0], c[1]
+	c2[4], c2[5] = c[4], c[5]
+	c1[2] = (c[0] + c[2]) / 2
+	c1[3] = (c[1] + c[3]) / 2
+	c2[2] = (c[2] + c[4]) / 2
+	c2[3] = (c[3] + c[5]) / 2
+	c1[4] = (c1[2] + c2[2]) / 2
+	c1[5] = (c1[3] + c2[3]) / 2
+	c2[0], c2[1] = c1[4], c1[5]
+	return
+}
+
+func (curve *QuadCurveFloat64) Segment(t LineTracer, flattening_threshold float64) {
+	var curves [CurveRecursionLimit]QuadCurveFloat64
+	curves[0] = *curve
+	i := 0
+	// current curve
+	var c *QuadCurveFloat64
+	var dx, dy, d float64
+
+	for i >= 0 {
+		c = &curves[i]
+		dx = c[4] - c[0]
+		dy = c[5] - c[1]
+
+		d = math.Abs(((c[2]-c[4])*dy - (c[3]-c[5])*dx))
+
+		if (d*d) < flattening_threshold*(dx*dx+dy*dy) || i == len(curves)-1 {
+			t.LineTo(c[4], c[5])
+			i--
+		} else {
+			// second half of bezier go lower onto the stack
+			c.Subdivide(&curves[i+1], &curves[i])
+			i++
+		}
+	}
+}