func DrawLine(gc *draw2d.ImageGraphicContext, x1, y1, x2, y2 float64) { gc.MoveTo(x1, y1) gc.LineTo(x2, y2) gc.FillStroke() }
func DrawCircle(gc *draw2d.ImageGraphicContext, x, y float64) { gc.ArcTo(x, y, 3, 3, 0, 2*math.Pi) gc.SetFillColor(color.RGBA{255, 0, 0, 255}) gc.FillStroke() }