func drawScissor(ctx *nanovgo.Context, x, y, t float32) {
ctx.Save()
// Draw first rect and set scissor to it's area.
ctx.Translate(x, y)
ctx.Rotate(nanovgo.DegToRad(5))
ctx.BeginPath()
ctx.Rect(-20, -20, 60, 40)
ctx.SetFillColor(nanovgo.RGBA(255, 0, 0, 255))
ctx.Fill()
ctx.Scissor(-20, -20, 60, 40)
// Draw second rectangle with offset and rotation.
ctx.Translate(40, 0)
ctx.Rotate(t)
// Draw the intended second rectangle without any scissoring.
ctx.Save()
ctx.ResetScissor()
ctx.BeginPath()
ctx.Rect(-20, -10, 60, 30)
ctx.SetFillColor(nanovgo.RGBA(255, 128, 0, 64))
ctx.Fill()
ctx.Restore()
// Draw second rectangle with combined scissoring.
ctx.IntersectScissor(-20, -10, 60, 30)
ctx.BeginPath()
ctx.Rect(-20, -10, 60, 30)
ctx.SetFillColor(nanovgo.RGBA(255, 128, 0, 255))
ctx.Fill()
ctx.Restore()
}
