luceda ipkiss教程 52：以pcell的方式定义text

以pcell方式定义的text，可以很方便地添加在线路中，如：

from si_fab import all as pdk
from ipkiss3 import all as i3

class Text(i3.PCell):
    _name_prefix = "Text"
    text = i3.StringProperty(default="text", doc="text for doe")
    height = i3.PositiveNumberProperty(default=10.0, doc="height of the characters")

    class Layout(i3.LayoutView):
        def _generate_instances(self, insts):
            elem = i3.PolygonText(
                layer=i3.TECH.PPLAYER.DOC,
                text=self.text,
                coordinate=(0.0, 0.0),
                height=self.height,
                font=i3.TEXT.FONT.STANDARD,
            )
            cell = i3.LayoutCell()
            cell.Layout(elements=[elem])
            insts += i3.SRef(reference=cell, position=(0.0, 0.0))
            return insts

        def _generate_ports(self, ports):
            center = self.instances[0].reference.size_info().center
            ports += i3.OpticalPort(name="loc", position=center)
            return ports


if __name__ == "__main__":
    text = Text(text="LUCEDA",height=40)
    text.Layout().visualize(annotate=True)