func (gc *GraphicContext) Rotate(angle float64) {
	gc.StackGraphicContext.Rotate(angle)
	gc.pdf.TransformRotate(-angle*180/math.Pi, 0, 0)
}
func (gc *GraphicContext) Rotate(angle float64) {
	gc.StackGraphicContext.Rotate(angle)
	gc.pdf.TransformRotate(-angle*180/math.Pi, 0, 0)
}
func ( gc * GraphicContext ) Rotate ( angle float64 ) { gc . StackGraphicContext . Rotate ( angle ) gc . pdf . TransformRotate ( - angle * 180 / math . Pi , 0 , 0 ) }
// Rotate rotates the following text, drawings and images.
// Angle is specified in radians and measured clockwise from the
// 3 o'clock position.
// This must be placed between gc.Save() and gc.Restore(), otherwise
// the pdf is invalid.
Rotate rotates the following text drawings and images . Angle is specified in radians and measured clockwise from the 3 o clock position . This must be placed between gc . Save () and gc . Restore () otherwise the pdf is invalid .