func WhiteBG(gc *draw2d.ImageGraphicContext, xsize, ysize float64) { gc.BeginPath() gc.MoveTo(0, 0) gc.LineTo(xsize, 0) gc.LineTo(xsize, ysize) gc.LineTo(0, ysize) gc.LineTo(0, 0) gc.Close() gc.SetFillColor(color.RGBA{255, 255, 255, 0xff}) gc.Fill() }