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) }