func (gc *GraphicContext) Clear() {
	width, height := gc.pdf.GetPageSize()
	clearRect(gc, 0, 0, width, height)
}
func (gc *GraphicContext) Clear() {
	width, height := gc.pdf.GetPageSize()
	clearRect(gc, 0, 0, width, height)
}
func ( gc * GraphicContext ) Clear ( ) { width , height := gc . pdf . GetPageSize ( ) clearRect ( gc , 0 , 0 , width , height ) }
// Clear draws a white rectangle over the whole page
Clear draws a white rectangle over the whole page