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