func (gc *GraphicContext) SetFontSize(fontSize float64) {
	gc.StackGraphicContext.SetFontSize(fontSize)
	gc.recalc()
	gc.pdf.SetFontSize(fontSize * gc.Current.Scale)
}
func (gc *GraphicContext) SetFontSize(fontSize float64) {
	gc.StackGraphicContext.SetFontSize(fontSize)
	gc.recalc()
	gc.pdf.SetFontSize(fontSize * gc.Current.Scale)
}
// SetFontSize sets the font size in points (as in ``a 12 point font'').
// TODO: resolve this with ImgGraphicContext (now done with gc.Current.Scale)