func (gc *GraphicContext) ClearRect(x1, y1, x2, y2 int) {
	clearRect(gc, float64(x1), float64(y1), float64(x2), float64(y2))
}
func (gc *GraphicContext) ClearRect(x1, y1, x2, y2 int) {
	clearRect(gc, float64(x1), float64(y1), float64(x2), float64(y2))
}
func ( gc * GraphicContext ) ClearRect ( x1 , y1 , x2 , y2 int ) { clearRect ( gc , float64 ( x1 ) , float64 ( y1 ) , float64 ( x2 ) , float64 ( y2 ) ) }
// ClearRect draws a white rectangle over the specified area.
// Samples: line.
ClearRect draws a white rectangle over the specified area . Samples : line .