// Dash draws a line with a dash pattern
func Dash(gc draw2d.GraphicContext, x, y, width, height float64) {
sx, sy := width/162, height/205
gc.SetStrokeColor(image.Black)
gc.SetLineDash([]float64{height / 10, height / 50, height / 50, height / 50}, -50.0)
gc.SetLineCap(draw2d.ButtCap)
gc.SetLineJoin(draw2d.RoundJoin)
gc.SetLineWidth(height / 50)
gc.MoveTo(x+sx*60.0, y)
gc.LineTo(x+sx*60.0, y)
gc.LineTo(x+sx*162, y+sy*205)
rLineTo(gc, sx*-102.4, 0)
gc.CubicCurveTo(x+sx*-17, y+sy*205, x+sx*-17, y+sy*103, x+sx*60.0, y+sy*103.0)
gc.Stroke()
gc.SetLineDash(nil, 0.0)
}