func (h *HilbertImage) drawLine(gc *draw2d.ImageGraphicContext, px1, py1, px2, py2 float64) {
gc.SetStrokeColor(h.SnakeColor)
gc.SetLineWidth(3)
gc.MoveTo(px1, py1)
gc.LineTo(px2, py2)
gc.Stroke()
}
func (h *HilbertImage) drawRectange(gc *draw2d.ImageGraphicContext, px1, py1, px2, py2 float64) {
gc.SetFillColor(h.BackgroundColor)
gc.SetStrokeColor(h.GridColor)
gc.SetLineWidth(1)
draw2d.Rect(gc, px1, py1, px2, py2)
gc.FillStroke()
}
func (h *HilbertImage) drawText(gc *draw2d.ImageGraphicContext, px1, py1 float64, t int) {
if !h.DrawText {
return
}
text := strconv.Itoa(t)
_, top, _, _ := gc.GetStringBounds(text)
gc.SetFillColor(h.TextColor)
gc.FillStringAt(text, px1+h.TextMargin, py1-top+h.TextMargin)
}