Elliptical Rings
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Full script
-----------------------------------

::

  from fnpcell import all as fp
  from gpdk.technology import get_technology


  @fp.pcell_class()

  class EllipticalRings(fp.PCell):
      def build(self):
          insts, elems, ports = super().build()
          # fmt: off
          TECH = get_technology()

          # elems += fp.el.EllipticalRing(outer_radius=(8, 10), inner_radius=(4, 5), initial_degrees=(0, 0), final_degrees=(180, 180), layer=TECH.LAYER.M1_DRW, origin=(0, 0))
          elems += fp.el.Ring(outer_radius=4, inner_radius=2, initial_degrees=(60, 30), final_degrees=(120, 150), layer=TECH.LAYER.M2_DRW, origin=(30, 0))
          # fmt: on
          return insts, elems, ports


  if __name__ == "__main__":
      from pathlib import Path

      gds_file = Path(__file__).parent / "local" / Path(__file__).with_suffix(".gds").name
      library = fp.Library()

      TECH = get_technology()
      # =============================================================
      # fmt: off

      library += EllipticalRings()

      # fmt: on
      # =============================================================
      fp.export_gds(library, file=gds_file)
      fp.plot(library)
      
      
fp.el.Ring Description
------------------------------------------------------------
      
::

  elems += fp.el.Ring(outer_radius=4, inner_radius=2, initial_degrees=(0, 0), final_degrees=(180, 180), layer=TECH.LAYER.M2_DRW, origin=(30, 0))


As shown in the figure, initial_degrees is the angle between the starting end and the x-axis, final_degrees is the angle between the ending end and the x-axis, the left parameter in the parentheses is the angle parameter of the external circle, the right is the angle parameter of the internal circle; origin defines the location of the center of the whole ring.


.. image:: ../example_image/6.1.png

In the following, we set the initial and end angles to (0, 30) and (150, 120), respectively. The following figure is obtained after running the script.


.. image:: ../example_image/6.2.png


fp.el.EllipticalRing Description
------------------------------------------------------------

::

  elems += fp.el.EllipticalRing(outer_radius=(8, 10), inner_radius=(4, 5), initial_degrees=(0, 0), final_degrees=(180, 180), layer=TECH.LAYER.M1_DRW, origin=(0, 0))
  
  
We can get an elliptical ring after running the above script. The first parameter of outer_radius and inner_radius represents the semi-short axis of the ellipse, and the second parameter represents the semi-long axis of the ellipse. initial_degrees and final_degrees are used in the same way as in the Ring function, so we will not repeat them here.


.. image:: ../example_image/6.3.png