// Circle draws a circle using a path with center (cx,cy) and radius
func Circle(path draw2d.PathBuilder, cx, cy, radius float64) {
path.ArcTo(cx, cy, radius, radius, 0, -math.Pi*2)
path.Close()
}
// Ellipse draws an ellipse using a path with center (cx,cy) and radius (rx,ry)
func Ellipse(path draw2d.PathBuilder, cx, cy, rx, ry float64) {
path.ArcTo(cx, cy, rx, ry, 0, -math.Pi*2)
path.Close()
}