draw2dpdf/gc.go
func (gc *GraphicContext) SetLineDash(Dash []float64, DashOffset float64) {
	gc.StackGraphicContext.SetLineDash(Dash, DashOffset)
	gc.pdf.SetDashPattern(Dash, DashOffset)
}
func (gc *GraphicContext) SetLineDash(Dash []float64, DashOffset float64) {
	gc.StackGraphicContext.SetLineDash(Dash, DashOffset)
	gc.pdf.SetDashPattern(Dash, DashOffset)
}
// SetLineDash sets the line dash pattern