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()
}
