color = "#ED6A5A"
class GlobalPaint: RectBlock {
    function paint(self: GlobalPaint, mount: Mount, geometry: Bounds): DisplayList {
        drawing = RectBlock.paint(self,mount,geometry)
        drawing.commands.at(0).color = color
        return drawing
    }
}
rect = GlobalPaint(480,120,12,"#DDEEFF")
page = Page()
page.title = "全局名字依赖"
page.render(Column(24,16,TextBlock("在 REPL 求值 42 不重绘；修改 color 会更新矩形颜色",2),rect))