Source code for kqcircuits.util.area

# This code is part of KQCircuits
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import logging
from os import cpu_count
from time import perf_counter

from kqcircuits.pya_resolver import pya


[docs]class AreaReceiver(pya.TileOutputReceiver): """Class for handling and storing output from :class:`TilingProcessor`""" def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) self.area = 0.0
[docs] def put(self, ix, iy, tile, obj, dbu, clip): """Function called by :class:`TilingProcessor` on output""" # pylint: disable=unused-argument logging.debug(f"Area for tile {ix},{iy}: {obj} ({dbu})") self.area = obj * (dbu * dbu) # report as um^2
[docs]def get_area_and_density(cell: pya.Cell, layer_infos=None): """Get total area and density :math:`\\rho=\\frac{area}{bbox.area}` of all layers. Args: cell: target cell to get area from layer_infos: list of ``LayerInfo`` to get area for, or None to get area for all layers. Returns: tuple: tuple containing lists of * layer names as str * total area as float * density between 0 and 1 as float """ start_time = perf_counter() layout = cell.layout() tp = pya.TilingProcessor() tp.threads = cpu_count() tp.tile_size = (2000, 2000) # microns if layer_infos is None: layer_infos = list(layout.layer_infos()) layer_areas = [AreaReceiver() for _ in layer_infos] layer_bboxes = [AreaReceiver() for _ in layer_infos] for layer_info, area_receiver, bbox_receiver in zip(layer_infos, layer_areas, layer_bboxes): name = f"_{layer_info.name}" # if `name` starts with a number, tp.execute() fails, so we add an underscore area, bbox = name + "_area", name + "_bbox" tp.input(name, cell.begin_shapes_rec(layout.layer(layer_info))) tp.output(area, area_receiver) tp.output(bbox, bbox_receiver) tp.queue(f"_output({area}, {name}.area)") tp.queue(f"_output({bbox}, {name}.bbox.area)") tp.execute("Calculate polygon and bounding box area") areas = [area.area for area in layer_areas] bboxes = [bbox.area for bbox in layer_bboxes] layer_names = [layer_info.name for layer_info in layer_infos] densities = [area / bbox if bbox != 0.0 else 0.0 for area, bbox in zip(areas, bboxes)] if len(areas) > 0: logging.info(f"For cell {cell.name} got layer areas: {areas}") logging.info(f"Area calculation took {perf_counter() - start_time:.1f} seconds") return layer_names, areas, densities