cubic example

examples/cubic.go

@@ -0,0 +1,36 @@
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+	const S = 1000
+	dc := gg.NewContext(S, S)
+	dc.SetRGB(1, 1, 1)
+	dc.Clear()
+	dc.Translate(S/2, S/2)
+	dc.Scale(40, 40)
+
+	var x0, y0, x1, y1, x2, y2, x3, y3 float64
+	x0, y0 = -10, 0
+	x1, y1 = -8, -8
+	x2, y2 = 8, 8
+	x3, y3 = 10, 0
+
+	dc.MoveTo(x0, y0)
+	dc.CubicTo(x1, y1, x2, y2, x3, y3)
+	dc.SetRGBA(0, 0, 0, 0.2)
+	dc.SetLineWidth(10)
+	dc.FillPreserve()
+	dc.SetRGB(0, 0, 0)
+	dc.Stroke()
+
+	dc.MoveTo(x0, y0)
+	dc.LineTo(x1, y1)
+	dc.LineTo(x2, y2)
+	dc.LineTo(x3, y3)
+	dc.SetRGBA(1, 0, 0, 0.4)
+	dc.SetLineWidth(2)
+	dc.Stroke()
+
+	dc.SavePNG("out.png")
+}