func (gc *GraphicContext) paint(rasterizer *raster.Rasterizer, color color.Color) {
gc.painter.SetColor(color)
rasterizer.Rasterize(gc.painter)
rasterizer.Clear()
gc.painter.Flush()
gc.Current.Path.Clear()
}
func contour(r *raster.Rasterizer, ns []node) {
if len(ns) == 0 {
return
}
i := 0
r.Start(p(ns[i]))
for {
switch ns[i].degree {
case -1:
// -1 signifies end-of-contour.
return
case 1:
i += 1
r.Add1(p(ns[i]))
case 2:
i += 2
r.Add2(p(ns[i-1]), p(ns[i]))
default:
panic("bad degree")
}
}
}
func rasterBbox(rasterizer *raster.Rasterizer) (r image.Rectangle) {
var bbox bboxPainter
rasterizer.Rasterize(&bbox)
return bbox.R
}