1050 lines
48 KiB
Python
1050 lines
48 KiB
Python
#!/usr/bin/env python3
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import subprocess
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import sys
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import math
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import multiprocessing
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import os
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from math import *
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from pathlib import Path
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from itertools import cycle
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from contextlib import contextmanager
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from scipy.constants import mu_0
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import numpy as np
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import click
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import matplotlib as mpl
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from gerbonara.cad.kicad import pcb as kicad_pcb
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from gerbonara.cad.kicad import footprints as kicad_fp
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from gerbonara.cad.kicad import graphical_primitives as kicad_gr
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from gerbonara.cad.kicad import primitives as kicad_pr
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from gerbonara.utils import Tag
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from gerbonara import graphic_primitives as gp
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from gerbonara import graphic_objects as go
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__version__ = '1.0.0'
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def point_line_distance(p, l1, l2):
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x0, y0 = p
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x1, y1 = l1
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x2, y2 = l2
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# https://en.wikipedia.org/wiki/Distance_from_a_point_to_a_line
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return abs((x2-x1)*(y1-y0) - (x1-x0)*(y2-y1)) / sqrt((x2-x1)**2 + (y2-y1)**2)
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def line_line_intersection(l1, l2):
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p1, p2 = l1
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p3, p4 = l2
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x1, y1 = p1
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x2, y2 = p2
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x3, y3 = p3
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x4, y4 = p4
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# https://en.wikipedia.org/wiki/Line%E2%80%93line_intersection
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px = ((x1*y2-y1*x2)*(x3-x4)-(x1-x2)*(x3*y4-y3*x4))/((x1-x2)*(y3-y4)-(y1-y2)*(x3-x4))
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py = ((x1*y2-y1*x2)*(y3-y4)-(y1-y2)*(x3*y4-y3*x4))/((x1-x2)*(y3-y4)-(y1-y2)*(x3-x4))
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return px, py
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def angle_between_vectors(va, vb):
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angle = atan2(vb[1], vb[0]) - atan2(va[1], va[0])
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if angle < 0:
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angle += 2*pi
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return angle
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def traces_to_gmsh(traces, mesh_out, bbox, model_name='gerbonara_board', log=True, copper_thickness=0.035, board_thickness=0.8, air_box_margin=5.0):
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import gmsh
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occ = gmsh.model.occ
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eps = 1e-6
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gmsh.initialize()
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gmsh.model.add('gerbonara_board')
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if log:
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gmsh.logger.start()
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trace_tags = {}
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trace_ends = set()
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render_cache = {}
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for i, tr in enumerate(traces, start=1):
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layer = tr[1].layer
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z0 = 0 if layer == 'F.Cu' else -(board_thickness+copper_thickness)
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prims = [prim
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for elem in tr
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for obj in elem.render(cache=render_cache)
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for prim in obj.to_primitives()]
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tags = []
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for prim in prims:
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if isinstance(prim, gp.Line):
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length = dist((prim.x1, prim.y1), (prim.x2, prim.y2))
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box_tag = occ.addBox(0, -prim.width/2, 0, length, prim.width, copper_thickness)
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angle = atan2(prim.y2 - prim.y1, prim.x2 - prim.x1)
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occ.rotate([(3, box_tag)], 0, 0, 0, 0, 0, 1, angle)
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occ.translate([(3, box_tag)], prim.x1, prim.y1, z0)
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tags.append(box_tag)
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for x, y in ((prim.x1, prim.y1), (prim.x2, prim.y2)):
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disc_id = (round(x, 3), round(y, 3), round(z0, 3), round(prim.width, 3))
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if disc_id in trace_ends:
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continue
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trace_ends.add(disc_id)
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cylinder_tag = occ.addCylinder(x, y, z0, 0, 0, copper_thickness, prim.width/2)
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tags.append(cylinder_tag)
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print('fusing', tags)
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tags, tag_map = occ.fuse([(3, tags[0])], [(3, tag) for tag in tags[1:]])
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print(tags)
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assert len(tags) == 1
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(_dim, tag), = tags
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trace_tags[i] = tag
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(x1, y1), (x2, y2) = bbox
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substrate = occ.addBox(x1, y1, -board_thickness, x2-x1, y2-y1, board_thickness)
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x1, y1 = x1-air_box_margin, y1-air_box_margin
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x2, y2 = x2+air_box_margin, y2+air_box_margin
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w, d = x2-x1, y2-y1
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z0 = -board_thickness-air_box_margin
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ab_h = board_thickness + 2*air_box_margin
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airbox = occ.addBox(x1, y1, z0, w, d, ab_h)
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print('Cutting airbox')
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occ.cut([(3, airbox)], [(3, tag) for tag in trace_tags.values()], removeObject=True, removeTool=False)
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print('Fragmenting')
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fragment_tags, fragment_hierarchy = occ.fragment([(3, airbox)], [(3, substrate)] + [(3, tag) for tag in trace_tags.values()])
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print('Synchronizing')
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occ.synchronize()
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substrate_physical = gmsh.model.add_physical_group(3, [substrate], name='substrate')
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airbox_physical = gmsh.model.add_physical_group(3, [airbox], name='airbox')
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trace_physical_surfaces = [
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gmsh.model.add_physical_group(2, list(gmsh.model.getAdjacencies(3, tag)[1]), name=f'trace{i}')
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for i, tag in trace_tags.items()]
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airbox_adjacent = set(gmsh.model.getAdjacencies(3, airbox)[1])
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in_bbox = {tag for _dim, tag in gmsh.model.getEntitiesInBoundingBox(x1+eps, y1+eps, z0+eps, x1+w-eps, y1+d-eps, z0+ab_h-eps, dim=3)}
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airbox_physical_surface = gmsh.model.add_physical_group(2, list(airbox_adjacent - in_bbox), name='airbox_surface')
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#points_airbox_adjacent = set(gmsh.model.getAdjacencies(0, airbox)[1])
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#points_inside = {tag for _dim, tag in gmsh.model.getEntitiesInBoundingBox(x1+eps, y1+eps, z0+eps, x1+w-eps, y1+d-eps, z0+ab_h-eps, dim=0)}
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#gmsh.model.mesh.setSize([(0, tag) for tag in points_airbox_adjacent - points_inside], 10e-3)
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gmsh.model.mesh.setSize(getPoints((3, airbox)), 10.0)
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trace_field = gmsh.model.mesh.field.add('BoundaryLayer')
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gmsh.model.mesh.field.setNumbers(trace_field, 'CurvesList', getCurves(*trace_tags.values()))
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gmsh.model.mesh.field.setNumber(trace_field, 'Size', 0.5)
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gmsh.model.mesh.field.setNumber(trace_field, 'SizeFar', 5.0)
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#gmsh.model.mesh.field.setAsBackgroundMesh(trace_field)
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substrate_field = gmsh.model.mesh.field.add('Box')
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gmsh.model.mesh.field.setNumber(substrate_field, 'VIn', board_thickness)
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gmsh.model.mesh.field.setNumber(substrate_field, 'VOut', 10.0)
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gmsh.model.mesh.field.setNumber(substrate_field, 'XMin', x1)
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gmsh.model.mesh.field.setNumber(substrate_field, 'YMin', y1)
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gmsh.model.mesh.field.setNumber(substrate_field, 'ZMin', -board_thickness)
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gmsh.model.mesh.field.setNumber(substrate_field, 'XMax', x2)
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gmsh.model.mesh.field.setNumber(substrate_field, 'YMax', y2)
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gmsh.model.mesh.field.setNumber(substrate_field, 'ZMax', 0)
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gmsh.model.mesh.field.setNumber(substrate_field, 'Thickness', 2*board_thickness)
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background_field = gmsh.model.mesh.field.add('MinAniso')
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gmsh.model.mesh.field.setNumbers(background_field, 'FieldsList', [trace_field, substrate_field])
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gmsh.model.mesh.field.setAsBackgroundMesh(background_field)
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gmsh.option.setNumber('Mesh.MeshSizeFromCurvature', 12)
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gmsh.option.setNumber('Mesh.Smoothing', 10)
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gmsh.option.setNumber('Mesh.Algorithm3D', 10)
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gmsh.option.setNumber('Mesh.MeshSizeMax', 1)
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gmsh.option.setNumber('General.NumThreads', multiprocessing.cpu_count())
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print('Meshing')
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gmsh.model.mesh.generate(dim=3)
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print('Writing')
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gmsh.write(str(mesh_out))
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@contextmanager
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def model_delta():
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import gmsh
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gmsh.model.occ.synchronize()
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entities = {i: set() for i in range(4)}
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for dim, tag in gmsh.model.getEntities():
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entities[dim].add(tag)
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yield
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gmsh.model.occ.synchronize()
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new_entities = {i: set() for i in range(4)}
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for dim, tag in gmsh.model.getEntities():
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new_entities[dim].add(tag)
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for i, dimtype in enumerate(['points', 'lines', 'surfaces', 'volumes']):
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delta = entities[i] - new_entities[i]
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print(f'Removed {dimtype} [{len(delta)}]: {", ".join(map(str, delta))[:180]}')
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delta = new_entities[i] - entities[i]
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print(f'New {dimtype} [{len(delta)}]: {", ".join(map(str, delta))[:180]}')
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def _gmsh_coil_inductance_geometry(traces, mesh_out, bbox, copper_thickness, board_thickness, air_box_margin_h):
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import gmsh
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occ = gmsh.model.occ
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trace_tags = []
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trace_ends = set()
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render_cache = {}
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first_disk, last_disk = None, None
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for i, tr in enumerate(traces, start=1):
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layer = tr[1].layer
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z0 = 0 if layer == 'F.Cu' else -(board_thickness+copper_thickness)
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objs = [obj
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for elem in tr
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for obj in elem.render(cache=render_cache)]
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tags = []
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for ob in objs:
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if isinstance(ob, go.Line):
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length = dist((ob.x1, ob.y1), (ob.x2, ob.y2))
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w = ob.aperture.equivalent_width('mm')
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box_tag = occ.addBox(0, -w/2, 0, length, w, copper_thickness)
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angle = atan2(ob.y2 - ob.y1, ob.x2 - ob.x1)
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occ.rotate([(3, box_tag)], 0, 0, 0, 0, 0, 1, angle)
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occ.translate([(3, box_tag)], ob.x1, ob.y1, z0)
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tags.append(box_tag)
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for x, y in ((ob.x1, ob.y1), (ob.x2, ob.y2)):
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disc_id = (round(x, 3), round(y, 3), round(z0, 3), round(w, 3))
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if disc_id in trace_ends:
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continue
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trace_ends.add(disc_id)
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cylinder_tag = occ.addCylinder(x, y, z0, 0, 0, copper_thickness, w/2)
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tags.append(cylinder_tag)
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if first_disk is None:
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occ.synchronize()
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adjacent = gmsh.model.getAdjacencies(3, cylinder_tag)
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first_disk = adjacent
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elif i == len(traces) and last_disk is None:
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occ.synchronize()
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adjacent = gmsh.model.getAdjacencies(3, cylinder_tag)
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last_disk = adjacent
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for elem in tr:
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if isinstance(elem, kicad_pcb.Via):
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# Account for the fact that KiCad's coordinates use an inverted Y axis compared to Gerbonara's internal
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# coordinate system.
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cylinder_tag = occ.addCylinder(elem.at.x, -elem.at.y, 0, 0, 0, -board_thickness, elem.drill/2)
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tags.append(cylinder_tag)
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occ.synchronize()
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if len(tags) > 1:
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print('fusing', tags)
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tags, tag_map = occ.fuse([(3, tags[0])], [(3, tag) for tag in tags[1:]])
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print(tags)
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assert len(tags) == 1
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(_dim, tag), = tags
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trace_tags.append(tag)
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print('fusing top-level', trace_tags)
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tags, tag_map = occ.fuse([(3, trace_tags[0])], [(3, tag) for tag in trace_tags[1:]])
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print(tags)
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assert len(tags) == 1
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(_dim, toplevel_tag), = tags
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(x1, y1), (x2, y2) = bbox
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first_geom = traces[0][0]
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with model_delta():
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print('Fragmenting disks')
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interface_tag_top = occ.addDisk(first_geom.start.x, first_geom.start.y, 0, first_geom.width/2, first_geom.width/2)
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interface_tag_bottom = occ.addDisk(first_geom.start.x, first_geom.start.y, -board_thickness, first_geom.width/2, first_geom.width/2)
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occ.fragment([(3, toplevel_tag)], [(2, interface_tag_top), (2, interface_tag_bottom)], removeObject=True, removeTool=True)
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substrate = occ.addBox(x1, y1, -board_thickness, x2-x1, y2-y1, board_thickness)
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print('cut')
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with model_delta():
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print(occ.cut([(3, substrate)], [(3, toplevel_tag)], removeObject=True, removeTool=False))
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return toplevel_tag, interface_tag_top, interface_tag_bottom, substrate
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def getCurves(*volume_tags):
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import gmsh
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dim_tags = gmsh.model.getBoundary([(3, tag) for tag in volume_tags], oriented=False)
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return [curve_tag for dim, curve_tag in gmsh.model.getBoundary(dim_tags, oriented=False, combined=False) if dim == 1]
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def getPoints(*dim_tags):
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import gmsh
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return [(0, tag) for dim, tag in gmsh.model.getBoundary(dim_tags, oriented=False, recursive=True) if dim == 0]
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def traces_to_gmsh_mag(traces, mesh_out, bbox, model_name='gerbonara_board', log=True, copper_thickness=0.035, board_thickness=0.8, air_box_margin_h=30.0, air_box_margin_v=80.0):
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import gmsh
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occ = gmsh.model.occ
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eps = 1e-6
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gmsh.initialize()
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gmsh.model.add('gerbonara_board')
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if log:
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gmsh.logger.start()
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toplevel_tag, interface_tag_top, interface_tag_bottom, substrate = _gmsh_coil_inductance_geometry(traces, mesh_out, bbox, copper_thickness, board_thickness, air_box_margin_h)
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(x1, y1), (x2, y2) = bbox
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x1, y1 = x1-air_box_margin_h, y1-air_box_margin_h
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x2, y2 = x2+air_box_margin_h, y2+air_box_margin_h
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w, d = x2-x1, y2-y1
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z0 = -2*copper_thickness-board_thickness-air_box_margin_v
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ab_h = 2*copper_thickness + board_thickness + 2*air_box_margin_v
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airbox = occ.addBox(x1, y1, z0, w, d, ab_h)
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print('cut')
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with model_delta():
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print(occ.cut([(3, airbox)], [(3, toplevel_tag), (3, substrate)], removeObject=True, removeTool=False))
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print(f'Fragmenting airbox ({airbox}) with {toplevel_tag=} {substrate=}')
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with model_delta():
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print(occ.fragment([(3, airbox)], [(3, toplevel_tag), (3, substrate)], removeObject=True, removeTool=False))
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print('Synchronizing')
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occ.synchronize()
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first_geom = traces[0][0]
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pcx, pcy = first_geom.start.x, first_geom.start.y
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pcr = first_geom.width/2
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(_dim, plane_top), = gmsh.model.getEntitiesInBoundingBox(pcx-pcr-eps, pcy-pcr-eps, -eps, pcx+pcr+eps, pcy+pcr+eps, eps, 2)
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(_dim, plane_bottom), = gmsh.model.getEntitiesInBoundingBox(pcx-pcr-eps, pcy-pcr-eps, -board_thickness-eps, pcx+pcr+eps, pcy+pcr+eps, -board_thickness+eps, 2)
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substrate_physical = gmsh.model.add_physical_group(3, [substrate], name='substrate')
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airbox_physical = gmsh.model.add_physical_group(3, [airbox], name='airbox')
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trace_physical = gmsh.model.add_physical_group(3, [toplevel_tag], name='trace')
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gmsh.model.mesh.setSize(getPoints((3, airbox)), 10.0)
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#gmsh.model.mesh.setSize(getPoints((3, substrate)), 1.0)
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#gmsh.model.mesh.setSize(getPoints((3, toplevel_tag)), 0.1)
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#trace_field = gmsh.model.mesh.field.add('AttractorAnisoCurve')
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#gmsh.model.mesh.field.setNumbers(trace_field, 'CurvesList', getCurves(toplevel_tag))
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#gmsh.model.mesh.field.setNumber(trace_field, 'DistMax', 1.0)
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#gmsh.model.mesh.field.setNumber(trace_field, 'DistMin', 0.3)
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#gmsh.model.mesh.field.setNumber(trace_field, 'SizeMinNormal', 0.1)
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#gmsh.model.mesh.field.setNumber(trace_field, 'SizeMaxNormal', 1.0)
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#gmsh.model.mesh.field.setNumber(trace_field, 'SizeMinTangent', 0.5)
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#gmsh.model.mesh.field.setNumber(trace_field, 'SizeMaxTangent', 2.0)
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#gmsh.model.mesh.field.setAsBackgroundMesh(trace_field)
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trace_field = gmsh.model.mesh.field.add('BoundaryLayer')
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gmsh.model.mesh.field.setNumbers(trace_field, 'CurvesList', getCurves(toplevel_tag))
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gmsh.model.mesh.field.setNumber(trace_field, 'Size', 0.5)
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gmsh.model.mesh.field.setNumber(trace_field, 'SizeFar', 5.0)
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#gmsh.model.mesh.field.setAsBackgroundMesh(trace_field)
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substrate_field = gmsh.model.mesh.field.add('Box')
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gmsh.model.mesh.field.setNumber(substrate_field, 'VIn', board_thickness)
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gmsh.model.mesh.field.setNumber(substrate_field, 'VOut', 10.0)
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gmsh.model.mesh.field.setNumber(substrate_field, 'XMin', x1)
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gmsh.model.mesh.field.setNumber(substrate_field, 'YMin', y1)
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gmsh.model.mesh.field.setNumber(substrate_field, 'ZMin', -board_thickness)
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gmsh.model.mesh.field.setNumber(substrate_field, 'XMax', x2)
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gmsh.model.mesh.field.setNumber(substrate_field, 'YMax', y2)
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gmsh.model.mesh.field.setNumber(substrate_field, 'ZMax', 0)
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gmsh.model.mesh.field.setNumber(substrate_field, 'Thickness', 2*board_thickness)
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background_field = gmsh.model.mesh.field.add('MinAniso')
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gmsh.model.mesh.field.setNumbers(background_field, 'FieldsList', [trace_field, substrate_field])
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gmsh.model.mesh.field.setAsBackgroundMesh(background_field)
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interface_top_physical = gmsh.model.add_physical_group(2, [plane_top], name='interface_top')
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interface_bottom_physical = gmsh.model.add_physical_group(2, [plane_bottom], name='interface_bottom')
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airbox_adjacent = set(gmsh.model.getAdjacencies(3, airbox)[1])
|
|
in_bbox = {tag for _dim, tag in gmsh.model.getEntitiesInBoundingBox(x1+eps, y1+eps, z0+eps, x2-eps, y2-eps, z0+ab_h-eps, dim=2)}
|
|
airbox_physical_surface = gmsh.model.add_physical_group(2, list(airbox_adjacent - in_bbox), name='airbox_surface')
|
|
|
|
points_airbox_adjacent = {tag for _dim, tag in gmsh.model.getBoundary([(3, airbox)], recursive=True, oriented=False)}
|
|
points_inside = {tag for _dim, tag in gmsh.model.getEntitiesInBoundingBox(x1+eps, y1+eps, z0+eps, x1+w-eps, y1+d-eps, z0+ab_h-eps, dim=0)}
|
|
#gmsh.model.mesh.setSize([(0, tag) for tag in points_airbox_adjacent - points_inside], 300e-3)
|
|
|
|
gmsh.option.setNumber('Mesh.MeshSizeFromCurvature', 12)
|
|
gmsh.option.setNumber('Mesh.Smoothing', 10)
|
|
gmsh.option.setNumber('Mesh.Algorithm3D', 10) # HXT
|
|
gmsh.option.setNumber('Mesh.MeshSizeMax', 10)
|
|
gmsh.option.setNumber('Mesh.MeshSizeMin', 0.25)
|
|
gmsh.option.setNumber('General.NumThreads', multiprocessing.cpu_count())
|
|
|
|
print('Writing geo file')
|
|
gmsh.write('/tmp/test.geo_unrolled')
|
|
print('Meshing')
|
|
gmsh.model.mesh.generate(dim=3)
|
|
print('Writing to', str(mesh_out))
|
|
gmsh.write(str(mesh_out))
|
|
|
|
|
|
def traces_to_gmsh_mag_mutual(traces, mesh_out, bbox, model_name='gerbonara_board', log=True, copper_thickness=0.035, board_thickness=0.8, air_box_margin_h=30.0, air_box_margin_v=80.0, mutual_offset=(0, 0, 5), mutual_rotation=(0, 0, 0)):
|
|
import gmsh
|
|
occ = gmsh.model.occ
|
|
eps = 1e-6
|
|
|
|
gmsh.initialize()
|
|
gmsh.model.add('gerbonara_board')
|
|
if log:
|
|
gmsh.logger.start()
|
|
|
|
m_dx, m_dy, m_dz = mutual_offset
|
|
m_ax, m_ay, m_az = mutual_rotation
|
|
m_dz += 2*copper_thickness + board_thickness
|
|
|
|
toplevel_tag1, interface_tag_top1, interface_tag_bottom1, substrate1 = _gmsh_coil_inductance_geometry(traces, mesh_out, bbox, copper_thickness, board_thickness, air_box_margin_h)
|
|
|
|
upper_coil = [(3, toplevel_tag1), (3, substrate1)]
|
|
occ.translate(upper_coil, m_dx, m_dy, m_dz)
|
|
|
|
print('rotate')
|
|
with model_delta():
|
|
occ.rotate(upper_coil, 0, 0, 0, 0, 0, 1, m_az)
|
|
|
|
toplevel_tag2, interface_tag_top2, interface_tag_bottom2, substrate2 = _gmsh_coil_inductance_geometry(traces, mesh_out, bbox, copper_thickness, board_thickness, air_box_margin_h)
|
|
|
|
(x1, y1), (x2, y2) = bbox
|
|
x1, y1 = x1-air_box_margin_h, y1-air_box_margin_h
|
|
x2, y2 = x2+air_box_margin_h, y2+air_box_margin_h
|
|
w, d = x2-x1, y2-y1
|
|
z0 = -2*copper_thickness-board_thickness-air_box_margin_v
|
|
ab_h = 4*copper_thickness + 2*board_thickness + 2*air_box_margin_v + m_dz
|
|
airbox = occ.addBox(x1, y1, z0, w, d, ab_h)
|
|
|
|
print('cut')
|
|
with model_delta():
|
|
print(occ.cut([(3, airbox)], [(3, toplevel_tag1), (3, toplevel_tag2), (3, substrate1), (3, substrate2)], removeObject=True, removeTool=False))
|
|
|
|
print(f'Fragmenting airbox ({airbox}) with {toplevel_tag1=} {substrate1=} {toplevel_tag2=} {substrate2=}')
|
|
with model_delta():
|
|
print(occ.fragment([(3, airbox)], [(3, toplevel_tag1), (3, toplevel_tag2), (3, substrate1), (3, substrate2)], removeObject=True, removeTool=False))
|
|
|
|
print('Synchronizing')
|
|
occ.synchronize()
|
|
|
|
first_geom = traces[0][0]
|
|
pcx, pcy = first_geom.start.x + m_dx, first_geom.start.y + m_dy
|
|
pcx, pcy = math.cos(m_az) * pcx - math.sin(m_az) * pcy, math.sin(m_az) * pcx + math.cos(m_az) * pcy
|
|
pcr = first_geom.width/2
|
|
|
|
(_dim, plane_top1), = gmsh.model.getEntitiesInBoundingBox(pcx-pcr-eps, pcy-pcr-eps, m_dz-eps, pcx+pcr+eps, pcy+pcr+eps, m_dz+eps, 2)
|
|
(_dim, plane_bottom1), = gmsh.model.getEntitiesInBoundingBox(pcx-pcr-eps, pcy-pcr-eps, m_dz-board_thickness-eps, pcx+pcr+eps, pcy+pcr+eps, m_dz-board_thickness+eps, 2)
|
|
|
|
pcx, pcy = first_geom.start.x, first_geom.start.y
|
|
(_dim, plane_top2), = gmsh.model.getEntitiesInBoundingBox(pcx-pcr-eps, pcy-pcr-eps, -eps, pcx+pcr+eps, pcy+pcr+eps, eps, 2)
|
|
(_dim, plane_bottom2), = gmsh.model.getEntitiesInBoundingBox(pcx-pcr-eps, pcy-pcr-eps, -board_thickness-eps, pcx+pcr+eps, pcy+pcr+eps, -board_thickness+eps, 2)
|
|
|
|
substrate1_physical = gmsh.model.add_physical_group(3, [substrate1], name='substrate1')
|
|
trace1_physical = gmsh.model.add_physical_group(3, [toplevel_tag1], name='trace1')
|
|
substrate2_physical = gmsh.model.add_physical_group(3, [substrate2], name='substrate2')
|
|
trace2_physical = gmsh.model.add_physical_group(3, [toplevel_tag2], name='trace2')
|
|
airbox_physical = gmsh.model.add_physical_group(3, [airbox], name='airbox')
|
|
|
|
interface_top1_physical = gmsh.model.add_physical_group(2, [plane_top1], name='interface_top1')
|
|
interface_bottom1_physical = gmsh.model.add_physical_group(2, [plane_bottom1], name='interface_bottom1')
|
|
interface_top2_physical = gmsh.model.add_physical_group(2, [plane_top2], name='interface_top2')
|
|
interface_bottom2_physical = gmsh.model.add_physical_group(2, [plane_bottom2], name='interface_bottom2')
|
|
|
|
airbox_adjacent = set(gmsh.model.getAdjacencies(3, airbox)[1])
|
|
in_bbox = {tag for _dim, tag in gmsh.model.getEntitiesInBoundingBox(x1+eps, y1+eps, z0+eps, x2-eps, y2-eps, z0+ab_h-eps, dim=2)}
|
|
airbox_physical_surface = gmsh.model.add_physical_group(2, list(airbox_adjacent - in_bbox), name='airbox_surface')
|
|
|
|
gmsh.model.mesh.setSize(getPoints((3, airbox)), 10.0)
|
|
|
|
trace_field = gmsh.model.mesh.field.add('BoundaryLayer')
|
|
gmsh.model.mesh.field.setNumbers(trace_field, 'CurvesList', getCurves(toplevel_tag1, toplevel_tag2))
|
|
gmsh.model.mesh.field.setNumber(trace_field, 'Size', 0.8)
|
|
gmsh.model.mesh.field.setNumber(trace_field, 'SizeFar', 10.0)
|
|
|
|
substrate_field = gmsh.model.mesh.field.add('AttractorAnisoCurve')
|
|
gmsh.model.mesh.field.setNumbers(substrate_field, 'CurvesList', getCurves(substrate1, substrate2))
|
|
gmsh.model.mesh.field.setNumber(substrate_field, 'DistMax', 10)
|
|
gmsh.model.mesh.field.setNumber(substrate_field, 'DistMin', 0)
|
|
gmsh.model.mesh.field.setNumber(substrate_field, 'SizeMinNormal', board_thickness/3)
|
|
gmsh.model.mesh.field.setNumber(substrate_field, 'SizeMaxNormal', 10.0)
|
|
gmsh.model.mesh.field.setNumber(substrate_field, 'SizeMinTangent', 1.0)
|
|
gmsh.model.mesh.field.setNumber(substrate_field, 'SizeMaxTangent', 10.0)
|
|
|
|
background_field = gmsh.model.mesh.field.add('MinAniso')
|
|
gmsh.model.mesh.field.setNumbers(background_field, 'FieldsList', [trace_field, substrate_field])
|
|
gmsh.model.mesh.field.setAsBackgroundMesh(background_field)
|
|
|
|
gmsh.option.setNumber('Mesh.MeshSizeFromCurvature', 20)
|
|
gmsh.option.setNumber('Mesh.Smoothing', 10)
|
|
gmsh.option.setNumber('Mesh.Algorithm3D', 10)
|
|
gmsh.option.setNumber('Mesh.MeshSizeMax', 10)
|
|
gmsh.option.setNumber('Mesh.MeshSizeMin', 0.5)
|
|
gmsh.option.setNumber('General.NumThreads', multiprocessing.cpu_count())
|
|
|
|
print('Meshing')
|
|
gmsh.model.mesh.generate(dim=3)
|
|
print('Writing to', str(mesh_out))
|
|
gmsh.write(str(mesh_out))
|
|
|
|
|
|
def traces_to_magneticalc(traces, out, pcb_thickness=0.8):
|
|
coords = []
|
|
last_x, last_y, last_z = None, None, None
|
|
def coord(x, y, z):
|
|
nonlocal coords, last_x, last_y, last_z
|
|
if (x, y, z) != (last_x, last_y, last_z):
|
|
coords.append((x, y, z))
|
|
|
|
render_cache = {}
|
|
for tr in traces:
|
|
z = pcb_thickness if tr[1].layer == 'F.Cu' else 0
|
|
objs = [obj
|
|
for elem in tr
|
|
for obj in elem.render(cache=render_cache)
|
|
if isinstance(elem, (kicad_pcb.TrackSegment, kicad_pcb.TrackArc))]
|
|
|
|
# start / switch layer
|
|
coord(objs[0].x1, objs[0].y1, z)
|
|
|
|
for ob in objs:
|
|
coord(ob.x2, ob.y2, z)
|
|
|
|
np.savetxt(out, np.array(coords) / 10) # magneticalc expects centimeters, not millimeters.
|
|
|
|
|
|
class SVGPath:
|
|
def __init__(self, **attrs):
|
|
self.d = ''
|
|
self.attrs = attrs
|
|
|
|
def line(self, x, y):
|
|
self.d += f'L {x} {y} '
|
|
|
|
def move(self, x, y):
|
|
self.d += f'M {x} {y} '
|
|
|
|
def arc(self, x, y, r, large, sweep):
|
|
self.d += f'A {r} {r} 0 {int(large)} {int(sweep)} {x} {y} '
|
|
|
|
def close(self):
|
|
self.d += 'Z '
|
|
|
|
def __str__(self):
|
|
attrs = ' '.join(f'{key.replace("_", "-")}="{value}"' for key, value in self.attrs.items())
|
|
return f'<path {attrs} d="{self.d.rstrip()}"/>'
|
|
|
|
class SVGCircle:
|
|
def __init__(self, r, cx, cy, **attrs):
|
|
self.r = r
|
|
self.cx, self.cy = cx, cy
|
|
self.attrs = attrs
|
|
|
|
def __str__(self):
|
|
attrs = ' '.join(f'{key.replace("_", "-")}="{value}"' for key, value in self.attrs.items())
|
|
return f'<circle {attrs} r="{self.r}" cx="{self.cx}" cy="{self.cy}"/>'
|
|
|
|
def svg_file(fn, stuff, vbw, vbh, vbx=0, vby=0):
|
|
with open(fn, 'w') as f:
|
|
f.write('<?xml version="1.0" standalone="no"?>\n')
|
|
f.write('<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\n')
|
|
f.write(f'<svg version="1.1" width="{vbw*4}mm" height="{vbh*4}mm" viewBox="{vbx} {vby} {vbw} {vbh}" style="background-color: #333" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">>\n')
|
|
|
|
for foo in stuff:
|
|
f.write(str(foo))
|
|
|
|
f.write('</svg>\n')
|
|
|
|
|
|
# https://en.wikipedia.org/wiki/Farey_sequence#Next_term
|
|
def farey_sequence(n: int, descending: bool = False) -> None:
|
|
"""Print the n'th Farey sequence. Allow for either ascending or descending."""
|
|
a, b, c, d = 0, 1, 1, n
|
|
if descending:
|
|
a, c = 1, n - 1
|
|
#print(f"{a}/{b}")
|
|
yield a, b
|
|
|
|
while c <= n and not descending or a > 0 and descending:
|
|
k = (n + b) // d
|
|
a, b, c, d = c, d, k * c - a, k * d - b
|
|
#print(f"{a}/{b}")
|
|
yield a, b
|
|
|
|
|
|
def divisors(n, max_b=10):
|
|
for a, b in farey_sequence(n):
|
|
if a == n and b < max_b:
|
|
yield b
|
|
if b == n and a < max_b:
|
|
yield a
|
|
|
|
|
|
def print_valid_twists(ctx, param, value):
|
|
if not value or ctx.resilient_parsing:
|
|
return
|
|
|
|
print(f'Valid twist counts for {value} turns:', file=sys.stderr)
|
|
for d in divisors(value, value):
|
|
print(f' {d}', file=sys.stderr)
|
|
|
|
click.echo()
|
|
ctx.exit()
|
|
|
|
|
|
@click.command()
|
|
@click.argument('outfile', required=False, type=click.Path(writable=True, dir_okay=False, path_type=Path))
|
|
@click.option('--footprint-name', help="Name for the generated footprint. Default: Output file name sans extension.")
|
|
@click.option('--layer-pair', default='F.Cu,B.Cu', help="Target KiCad layer pair for the generated footprint, comma-separated. Default: F.Cu/B.Cu.")
|
|
@click.option('--turns', type=int, default=5, help='Number of turns')
|
|
@click.option('--pcb/--footprint', default=False, help='Generate a KiCad PCB instead of a footprint')
|
|
@click.option('--outer-diameter', type=float, default=50, help='Outer diameter [mm]')
|
|
@click.option('--inner-diameter', type=float, default=25, help='Inner diameter [mm]')
|
|
@click.option('--trace-width', type=float, default=None)
|
|
@click.option('--via-diameter', type=float, default=0.6)
|
|
@click.option('--two-layer/--single-layer', default=True)
|
|
@click.option('--via-drill', type=float, default=0.3)
|
|
@click.option('--via-offset', type=float, default=None, help='Radially offset vias from trace endpoints [mm]')
|
|
@click.option('--keepout-zone/--no-keepout-zone', default=True, help='Add a keepout are to the footprint (default: yes)')
|
|
@click.option('--keepout-margin', type=float, default=5, help='Margin between outside of coil and keepout area (mm, default: 5)')
|
|
@click.option('--copper-thickness', type=float, default=0.035, help='Copper thickness for resistance calculation and mesh generation in mm. Default: 0.035mm ^= 1 Oz')
|
|
@click.option('--board-thickness', type=float, default=1.53, help='Board substrate thickness for mesh generation in mm. Default: 1.53mm')
|
|
@click.option('--twists', type=int, default=1, help='Number of twists per revolution. Note that this number must be co-prime to the number of turns. Run with --show-twists to list valid values. (default: 1)')
|
|
@click.option('--circle-segments', type=int, default=64, help='When not using arcs, the number of points to use for arc interpolation per 360 degrees.')
|
|
@click.option('--show-twists', callback=print_valid_twists, expose_value=False, type=int, is_eager=True, help='Calculate and show valid --twists counts for the given number of turns. Takes the number of turns as a value.')
|
|
@click.option('--close-loop', is_flag=True, help='Close coil loop for simulation meshes')
|
|
@click.option('--clearance', type=float, default=None)
|
|
@click.option('--arc-tolerance', type=float, default=0.02)
|
|
@click.option('--mesh-split-out', type=click.Path(writable=True, dir_okay=False, path_type=Path))
|
|
@click.option('--mesh-out', type=click.Path(writable=True, dir_okay=False, path_type=Path))
|
|
@click.option('--mesh-mutual-out', type=click.Path(writable=True, dir_okay=False, path_type=Path))
|
|
@click.option('--mutual-offset-x', type=float, default=0)
|
|
@click.option('--mutual-offset-y', type=float, default=0)
|
|
@click.option('--mutual-offset-z', type=float, default=5)
|
|
@click.option('--mutual-rotation-z', type=float, default=0)
|
|
@click.option('--magneticalc-out', type=click.Path(writable=True, dir_okay=False, path_type=Path))
|
|
@click.option('--clipboard/--no-clipboard', help='Use clipboard integration (requires wl-clipboard)')
|
|
@click.option('--counter-clockwise/--clockwise', help='Direction of generated spiral. Default: clockwise when wound from the inside.')
|
|
@click.version_option()
|
|
def generate(outfile, turns, outer_diameter, inner_diameter, via_diameter, via_drill, via_offset, trace_width, clearance,
|
|
footprint_name, layer_pair, twists, clipboard, counter_clockwise, keepout_zone, keepout_margin,
|
|
arc_tolerance, pcb, mesh_out, magneticalc_out, circle_segments, mesh_split_out, copper_thickness,
|
|
board_thickness, mesh_mutual_out, mutual_offset_x, mutual_offset_y, mutual_offset_z, mutual_rotation_z,
|
|
two_layer, close_loop):
|
|
|
|
if 'WAYLAND_DISPLAY' in os.environ:
|
|
copy, paste, cliputil = ['wl-copy'], ['wl-paste'], 'xclip'
|
|
else:
|
|
copy, paste, cliputil = ['xclip', '-i', '-sel', 'clipboard'], ['xclip', '-o', '-sel' 'clipboard'], 'wl-clipboard'
|
|
|
|
if gcd(twists, turns) != 1:
|
|
raise click.ClickException('For the geometry to work out, the --twists parameter must be co-prime to --turns, i.e. the two must have 1 as their greatest common divisor. You can print valid values for --twists by running this command with --show-twists [turns number].')
|
|
|
|
if (mesh_out or mesh_split_out or mesh_mutual_out) and not pcb:
|
|
raise click.ClickException('--pcb is required when --mesh-out, --mesh-mutual-out or --mesh-split-out are used.')
|
|
|
|
if magneticalc_out and not pcb:
|
|
raise click.ClickException('--pcb is required when --magneticalc-out is used.')
|
|
|
|
outer_radius = outer_diameter/2
|
|
inner_radius = inner_diameter/2
|
|
turns_per_layer = turns/2 if two_layer else turns
|
|
|
|
sweeping_angle = 2*pi * turns_per_layer / twists
|
|
spiral_pitch = (outer_radius-inner_radius) / turns_per_layer
|
|
c1 = inner_radius
|
|
c2 = inner_radius + spiral_pitch
|
|
alpha1 = atan((outer_radius - inner_radius) / sweeping_angle / c1)
|
|
alpha2 = atan((outer_radius - inner_radius) / sweeping_angle / c2)
|
|
alpha = (alpha1+alpha2)/2
|
|
projected_spiral_pitch = spiral_pitch*cos(alpha)
|
|
|
|
if trace_width is None and clearance is None:
|
|
trace_width = 0.15
|
|
print(f'Warning: Defaulting to {trace_width:.2f} mm trace width.', file=sys.stderr)
|
|
|
|
if trace_width is None:
|
|
if round(clearance, 3) > round(projected_spiral_pitch, 3):
|
|
raise click.ClickException(f'Error: Given clearance of {clearance:.2f} mm is larger than the projected spiral pitch of {projected_spiral_pitch:.2f} mm. Reduce clearance or increase the size of the coil.')
|
|
trace_width = projected_spiral_pitch - clearance
|
|
print(f'Calculated trace width for {clearance:.2f} mm clearance is {trace_width:.2f} mm.', file=sys.stderr)
|
|
|
|
elif clearance is None:
|
|
if round(trace_width, 2) > round(projected_spiral_pitch, 2):
|
|
raise click.ClickException(f'Error: Given trace width of {trace_width:.2f} mm is larger than the projected spiral pitch of {projected_spiral_pitch:.2f} mm. Reduce clearance or increase the size of the coil.')
|
|
clearance = projected_spiral_pitch - trace_width
|
|
print(f'Calculated clearance for {trace_width:.2f} mm trace width is {clearance:.2f} mm.', file=sys.stderr)
|
|
|
|
else:
|
|
if round(trace_width, 2) > round(projected_spiral_pitch, 2):
|
|
raise click.ClickException(f'Error: Given trace width of {trace_width:.2f} mm is larger than the projected spiral pitch of {projected_spiral_pitch:.2f} mm. Reduce clearance or increase the size of the coil.')
|
|
clearance_actual = projected_spiral_pitch - trace_width
|
|
if round(clearance_actual, 3) < round(clearance, 3):
|
|
raise click.ClickException(f'Error: Actual clearance for {trace_width:.2f} mm trace is {clearance_actual:.2f} mm, which is lower than the given clearance of {clearance:.2f} mm.')
|
|
|
|
if round(via_diameter, 2) < round(trace_width, 2):
|
|
print(f'Clipping via diameter from {via_diameter:.2f} mm to trace width of {trace_width:.2f} mm.', file=sys.stderr)
|
|
via_diameter = trace_width
|
|
|
|
if via_offset is None:
|
|
via_offset = max(0, (via_diameter-trace_width)/2)
|
|
print(f'Autocalculated via offset {via_offset:.2f} mm', file=sys.stderr)
|
|
|
|
inner_via_ring_radius = inner_radius - via_offset
|
|
#print(f'{inner_radius=} {via_offset=} {via_diameter=}', file=sys.stderr)
|
|
inner_via_angle = 2*asin((via_diameter + clearance)/2 / inner_via_ring_radius)
|
|
|
|
outer_via_ring_radius = outer_radius + via_offset
|
|
outer_via_angle = 2*asin((via_diameter + clearance)/2 / outer_via_ring_radius)
|
|
|
|
print(f'Inner via ring @r={inner_via_ring_radius:.2f} mm (from {inner_radius:.2f} mm)', file=sys.stderr)
|
|
print(f' {degrees(inner_via_angle):.1f} deg / via', file=sys.stderr)
|
|
print(f'Outer via ring @r={outer_via_ring_radius:.2f} mm (from {outer_radius:.2f} mm)', file=sys.stderr)
|
|
print(f' {degrees(outer_via_angle):.1f} deg / via', file=sys.stderr)
|
|
|
|
# Check if the vias of the inner ring are so large that they would overlap
|
|
if inner_via_angle*twists > 2*pi:
|
|
min_dia = 2*((via_diameter + clearance) / (2*sin(pi / twists)) + via_offset)
|
|
raise click.ClickException(f'Error: Overlapping vias in inner via ring. Calculated minimum inner diameter is {min_dia:.2f} mm.')
|
|
|
|
pitch = clearance + trace_width
|
|
t, _, b = layer_pair.partition(',')
|
|
layer_pair = (t.strip(), b.strip())
|
|
rainbow = '#817 #a35 #c66 #e94 #ed0 #9d5 #4d8 #2cb #0bc #09c #36b #639'.split()
|
|
rainbow = rainbow[2::3] + rainbow[1::3] + rainbow[0::3]
|
|
n = 5
|
|
rainbow = rainbow[n:] + rainbow[:n]
|
|
out_paths = []
|
|
svg_stuff = [*out_paths]
|
|
|
|
# For fill factor & inductance formulas, See https://coil32.net/pcb-coil.html for details
|
|
d_avg = (outer_diameter + inner_diameter)/2
|
|
phi = (outer_diameter - inner_diameter) / (outer_diameter + inner_diameter)
|
|
c1, c2, c3, c4 = 1.00, 2.46, 0.00, 0.20
|
|
L = mu_0 * turns**2 * d_avg*1e3 * c1 / 2 * (log(c2/phi) + c3*phi + c4*phi**2)
|
|
print(f'Outer diameter: {outer_diameter:g} mm', file=sys.stderr)
|
|
print(f'Average diameter: {d_avg:g} mm', file=sys.stderr)
|
|
print(f'Inner diameter: {inner_diameter:g} mm', file=sys.stderr)
|
|
print(f'Fill factor: {phi:g}', file=sys.stderr)
|
|
print(f'Approximate inductance: {L:g} µH', file=sys.stderr)
|
|
|
|
make_pad = lambda num, layer, x, y: kicad_fp.Pad(
|
|
number=str(num),
|
|
type=kicad_fp.Atom.smd,
|
|
shape=kicad_fp.Atom.circle,
|
|
at=kicad_fp.AtPos(x=x, y=y),
|
|
size=kicad_fp.XYCoord(x=trace_width, y=trace_width),
|
|
layers=layer,
|
|
clearance=clearance,
|
|
zone_connect=0)
|
|
|
|
make_line = lambda x1, y1, x2, y2, layer: kicad_fp.Line(
|
|
start=kicad_fp.XYCoord(x=x1, y=y1),
|
|
end=kicad_fp.XYCoord(x=x2, y=y2),
|
|
layer=layer,
|
|
stroke=kicad_fp.Stroke(width=trace_width))
|
|
|
|
make_arc = lambda x1, y1, x2, y2, xm, ym, layer: kicad_fp.Arc(
|
|
start=kicad_fp.XYCoord(x=x1, y=y1),
|
|
mid=kicad_fp.XYCoord(x=xm, y=ym),
|
|
end=kicad_fp.XYCoord(x=x2, y=y2),
|
|
layer=layer,
|
|
stroke=kicad_fp.Stroke(width=trace_width))
|
|
|
|
|
|
make_via = lambda x, y, layers: kicad_fp.Pad(number="NC",
|
|
type=kicad_fp.Atom.thru_hole,
|
|
shape=kicad_fp.Atom.circle,
|
|
at=kicad_fp.AtPos(x=x, y=y),
|
|
size=kicad_fp.XYCoord(x=via_diameter, y=via_diameter),
|
|
drill=kicad_fp.Drill(diameter=via_drill),
|
|
layers=layers,
|
|
clearance=clearance,
|
|
zone_connect=0)
|
|
|
|
pads = []
|
|
lines = []
|
|
arcs = []
|
|
|
|
def arc_approximate(points, layer, tolerance=0.02, level=0):
|
|
indent = ' ' * level
|
|
#print(f'{indent}arc_approximate {len(points)=}', file=sys.stderr)
|
|
if len(points) < 3:
|
|
raise ValueError()
|
|
|
|
i_mid = len(points)//2
|
|
|
|
x0, y0 = points[0]
|
|
x1, y1 = points[i_mid]
|
|
x2, y2 = points[-1]
|
|
|
|
if len(points) < 5:
|
|
#print(f'{indent} -> interp last points', file=sys.stderr)
|
|
yield make_arc(x0, y0, x2, y2, x1, y1, layer)
|
|
|
|
# https://stackoverflow.com/questions/56224824/how-do-i-find-the-circumcenter-of-the-triangle-using-python-without-external-lib
|
|
d = 2 * (x0 * (y2 - y1) + x2 * (y1 - y0) + x1 * (y0 - y2))
|
|
cx = ((x0 * x0 + y0 * y0) * (y2 - y1) + (x2 * x2 + y2 * y2) * (y1 - y0) + (x1 * x1 + y1 * y1) * (y0 - y2)) / d
|
|
cy = ((x0 * x0 + y0 * y0) * (x1 - x2) + (x2 * x2 + y2 * y2) * (x0 - x1) + (x1 * x1 + y1 * y1) * (x2 - x0)) / d
|
|
r = dist((cx, cy), (x1, y1))
|
|
if any(abs(dist((px, py), (cx, cy)) - r) > tolerance for px, py in points):
|
|
#print(f'{indent} -> split', file=sys.stderr)
|
|
yield from arc_approximate(points[:i_mid+1], layer, tolerance, level+1)
|
|
yield from arc_approximate(points[i_mid:], layer, tolerance, level+1)
|
|
|
|
else:
|
|
yield make_arc(x0, y0, x2, y2, x1, y1, layer)
|
|
#print(f'{indent} -> good fit', file=sys.stderr)
|
|
|
|
def do_spiral(layer, r1, r2, a1, a2, start_frac, end_frac, fn=64):
|
|
use_arcs = not pcb
|
|
|
|
fn = ceil(fn * (a2-a1)/(2*pi))
|
|
x0, y0 = cos(a1)*r1, sin(a1)*r1
|
|
direction = '↓' if r2 < r1 else '↑'
|
|
dr = 3 if r2 < r1 else -3
|
|
label = f'{direction} {degrees(a1):.0f}'
|
|
svg_stuff.append(Tag('text',
|
|
[label],
|
|
x=str(x0 + cos(a1)*dr),
|
|
y=str(y0 + sin(a1)*dr),
|
|
text_anchor='middle',
|
|
style=f'font: 1px bold sans-serif; fill: {rainbow[layer%len(rainbow)]}'))
|
|
|
|
xn, yn = x0, y0
|
|
points = [(x0, y0)]
|
|
dists = []
|
|
for i in range(fn):
|
|
r, g, b, _a = mpl.cm.plasma(start_frac + (end_frac - start_frac)/fn * (i + 0.5))
|
|
path = SVGPath(fill='none', stroke=f'#{round(r*255):02x}{round(g*255):02x}{round(b*255):02x}', stroke_width=trace_width, stroke_linejoin='round', stroke_linecap='round')
|
|
svg_stuff.append(path)
|
|
xp, yp = xn, yn
|
|
r = r1 + (i+1)*(r2-r1)/fn
|
|
a = a1 + (i+1)*(a2-a1)/fn
|
|
xn, yn = cos(a)*r, sin(a)*r
|
|
path.move(xp, yp)
|
|
path.line(xn, yn)
|
|
points.append((xn, yn))
|
|
dists.append(dist((xp, yp), (xn, yn)))
|
|
if not use_arcs:
|
|
lines.append(make_line(xp, yp, xn, yn, layer_pair[layer]))
|
|
|
|
if use_arcs:
|
|
arcs.extend(arc_approximate(points, layer_pair[layer], arc_tolerance))
|
|
|
|
svg_stuff.append(Tag('text',
|
|
[label],
|
|
x=str(xn + cos(a2)*-dr),
|
|
y=str(yn + sin(a2)*-dr + 1.2),
|
|
text_anchor='middle',
|
|
style=f'font: 1px bold sans-serif; fill: {rainbow[layer%len(rainbow)]}'))
|
|
|
|
return (x0, y0), (xn, yn), sum(dists)
|
|
|
|
sector_angle = 2*pi / twists
|
|
total_angle = twists*2*sweeping_angle if two_layer else twists*sweeping_angle
|
|
|
|
inverse = {}
|
|
for i in range(twists):
|
|
inverse[i*turns%twists] = i
|
|
|
|
svg_vias = []
|
|
for i in range(twists):
|
|
start_angle = i*sector_angle
|
|
fold_angle = start_angle + sweeping_angle
|
|
end_angle = fold_angle + sweeping_angle
|
|
|
|
x = inverse[i]*floor(2*sweeping_angle / (2*pi)) * 2*pi
|
|
(x0, y0), (xn, yn), clen = do_spiral(0, outer_radius, inner_radius, start_angle, fold_angle, (x + start_angle)/total_angle, (x + fold_angle)/total_angle, circle_segments)
|
|
if two_layer:
|
|
do_spiral(1, inner_radius, outer_radius, fold_angle, end_angle, (x + fold_angle)/total_angle, (x + end_angle)/total_angle)
|
|
else:
|
|
dr = outer_radius - inner_radius
|
|
xq = xn + cos(fold_angle) * dr
|
|
yq = yn - sin(fold_angle) * dr
|
|
lines.append(make_line(xn, yn, xq, yq, layer_pair[1]))
|
|
|
|
r, g, b, _a = mpl.cm.plasma((x + fold_angle)/total_angle)
|
|
path = SVGPath(fill='none', stroke=f'#{round(r*255):02x}{round(g*255):02x}{round(b*255):02x}', stroke_width=trace_width, stroke_linejoin='round', stroke_linecap='round')
|
|
svg_stuff.append(path)
|
|
path.move(xn, yn)
|
|
path.line(xq, yq)
|
|
|
|
xv, yv = inner_via_ring_radius*cos(fold_angle), inner_via_ring_radius*sin(fold_angle)
|
|
pads.append(make_via(xv, yv, layer_pair))
|
|
if not isclose(via_offset, 0, abs_tol=1e-6):
|
|
lines.append(make_line(xn, yn, xv, yv, layer_pair[0]))
|
|
lines.append(make_line(xn, yn, xv, yv, layer_pair[1]))
|
|
svg_vias.append(Tag('circle', cx=xv, cy=yv, r=via_diameter/2, stroke='none', fill='white'))
|
|
svg_vias.append(Tag('circle', cx=xv, cy=yv, r=via_drill/2, stroke='none', fill='black'))
|
|
|
|
if i > 0 or close_loop:
|
|
xv, yv = outer_via_ring_radius*cos(start_angle), outer_via_ring_radius*sin(start_angle)
|
|
pads.append(make_via(xv, yv, layer_pair))
|
|
if not isclose(via_offset, 0, abs_tol=1e-6):
|
|
lines.append(make_line(x0, y0, xv, yv, layer_pair[0]))
|
|
lines.append(make_line(x0, y0, xv, yv, layer_pair[1]))
|
|
svg_vias.append(Tag('circle', cx=xv, cy=yv, r=via_diameter/2, stroke='none', fill='white'))
|
|
svg_vias.append(Tag('circle', cx=xv, cy=yv, r=via_drill/2, stroke='none', fill='black'))
|
|
|
|
l_total = clen*twists*2
|
|
print(f'Approximate track length: {l_total:.2f} mm', file=sys.stderr)
|
|
A = copper_thickness/1e3 * trace_width/1e3
|
|
rho = 1.68e-8
|
|
R = l_total/1e3 * rho / A
|
|
print(f'Approximate resistance: {R:g} Ω', file=sys.stderr)
|
|
|
|
top_pad = make_pad(1, [layer_pair[0]], outer_radius, 0)
|
|
pads.append(top_pad)
|
|
bottom_pad = make_pad(2, [layer_pair[1]], outer_radius, 0)
|
|
pads.append(bottom_pad)
|
|
|
|
svg_stuff += svg_vias
|
|
|
|
svg_stuff.append(Tag('path', d=f'M {inner_radius} 0 L {outer_radius} 0', stroke=rainbow[n+1], fill='none',
|
|
stroke_width='0.05mm', stroke_linecap='round'))
|
|
ntraces = int(turns_per_layer)+1
|
|
alpha = [0] * ntraces
|
|
for i in range(ntraces):
|
|
c = inner_radius + (outer_radius-inner_radius) / turns_per_layer * i
|
|
#dalpha = dy / c
|
|
#dx / dalpha = (outer_radius - inner_radius) / sweeping_angle
|
|
#c * (dx / dy) = (outer_radius - inner_radius) / sweeping_angle
|
|
#dx / dy = (outer_radius - inner_radius) / sweeping_angle / c
|
|
dx = (outer_radius - inner_radius) / sweeping_angle / c
|
|
alpha[i] = atan(dx)
|
|
dy = 0.3
|
|
dx *= dy
|
|
r = trace_width/2 / cos(alpha[i])
|
|
svg_stuff.append(Tag('path', d=f'M {c-r+dx} {-dy} L {c-r-dx} {dy}', stroke=rainbow[n+1], fill='none',
|
|
stroke_width='0.05mm', stroke_linecap='round'))
|
|
svg_stuff.append(Tag('path', d=f'M {c+r+dx} {-dy} L {c+r-dx} {dy}', stroke=rainbow[n+1], fill='none',
|
|
stroke_width='0.05mm', stroke_linecap='round'))
|
|
|
|
#print(f'spiral angle {degrees(alpha[i]):.2f}', file=sys.stderr)
|
|
|
|
for i, (a1, a2) in enumerate(zip(alpha[::-1], alpha[1::])):
|
|
amean = (a2+a1)/2
|
|
pitch = (outer_radius - inner_radius) / turns_per_layer
|
|
clearance = pitch - trace_width
|
|
clearance *= cos(amean)
|
|
|
|
x, y = inner_radius + (i + 1/2)*pitch, -0.5
|
|
svg_stuff.append(Tag('text',
|
|
[f'{clearance:.5f}mm'],
|
|
x=x,
|
|
y=y,
|
|
text_anchor='start',
|
|
transform=f'rotate(-45 {x} {y})',
|
|
style=f'font: 1px bold sans-serif; fill: {rainbow[n+1]}'))
|
|
|
|
svg_file('/tmp/test.svg', svg_stuff, 100, 100, -50, -50)
|
|
|
|
if footprint_name:
|
|
name = footprint_name
|
|
elif outfile:
|
|
name = outfile.stem,
|
|
else:
|
|
name = 'generated_coil'
|
|
|
|
if keepout_zone:
|
|
r = outer_diameter/2 + keepout_margin
|
|
tol = 0.05 # mm
|
|
n = ceil(pi / acos(1 - tol/r))
|
|
pts = [(r*cos(a*2*pi/n), r*sin(a*2*pi/n)) for a in range(n)]
|
|
zones = [kicad_pr.Zone(layers=['*.Cu'],
|
|
hatch=kicad_pr.Hatch(),
|
|
filled_areas_thickness=False,
|
|
keepout=kicad_pr.ZoneKeepout(copperpour_allowed=False),
|
|
polygon=kicad_pr.ZonePolygon(pts=kicad_pr.PointList(xy=[kicad_pr.XYCoord(x=x, y=y) for x, y in pts])))]
|
|
else:
|
|
zones = []
|
|
|
|
if pcb:
|
|
obj = kicad_pcb.Board.empty_board(
|
|
zones=zones,
|
|
track_segments=[kicad_pcb.TrackSegment.from_footprint_line(line) for line in lines],
|
|
vias=[kicad_pcb.Via.from_pad(pad) for pad in pads if pad.type == kicad_pcb.Atom.thru_hole])
|
|
obj.rebuild_trace_index()
|
|
seg = obj.track_segments[-1]
|
|
traces = []
|
|
end = top_pad
|
|
layer = 'F.Cu'
|
|
while True:
|
|
tr = list(obj.find_connected_traces(end, layers=[layer]))
|
|
traces.append(tr)
|
|
if not isinstance(tr[-1], kicad_pcb.Via):
|
|
break
|
|
layer = 'B.Cu' if layer == 'F.Cu' else 'F.Cu'
|
|
end = tr[-1]
|
|
# remove start pad
|
|
traces[0] = traces[0][1:]
|
|
|
|
r = outer_diameter/2 + 20
|
|
if mesh_split_out:
|
|
traces_to_gmsh(traces, mesh_split_out, ((-r, -r), (r, r)), copper_thickness=copper_thickness, board_thickness=board_thickness)
|
|
|
|
if mesh_out:
|
|
traces_to_gmsh_mag(traces, mesh_out, ((-r, -r), (r, r)), copper_thickness=copper_thickness, board_thickness=board_thickness)
|
|
|
|
if mesh_mutual_out:
|
|
m_dx, m_dy, m_dz = mutual_offset_x, mutual_offset_y, mutual_offset_z
|
|
mutual_rotation_z = math.radians(mutual_rotation_z)
|
|
traces_to_gmsh_mag_mutual(traces, mesh_mutual_out, ((-r, -r), (r, r)),
|
|
copper_thickness=copper_thickness, board_thickness=board_thickness,
|
|
mutual_offset=(m_dx, m_dy, m_dz), mutual_rotation=(0, 0, mutual_rotation_z))
|
|
|
|
if magneticalc_out:
|
|
traces_to_magneticalc(traces, magneticalc_out)
|
|
|
|
# for trace in traces:
|
|
# print(f'Trace {i}', file=sys.stderr)
|
|
# print(f' Length: {len(trace)}', file=sys.stderr)
|
|
# print(f' Start: {trace[0]}', file=sys.stderr)
|
|
# print(f' End: {trace[-1]}', file=sys.stderr)
|
|
# print(f' Layer: {trace[1].layer}', file=sys.stderr)
|
|
|
|
#for e in obj.find_connected_traces(seg, layers=seg.layer_mask):
|
|
# print(getattr(e, 'layer', ''), str(e)[:80], file=sys.stderr)
|
|
#nodes, edges = obj.track_skeleton(pads[-1])
|
|
#for node, node_edges in edges.items():
|
|
# print(f'Node {node} with {len(node_edges)} edges', file=sys.stderr)
|
|
# for i, e in enumerate(node_edges):
|
|
# print(f' Edge {i}', file=sys.stderr)
|
|
# for elem in e:
|
|
# print(' ', elem, file=sys.stderr)
|
|
|
|
else:
|
|
obj = kicad_fp.Footprint(
|
|
name=name,
|
|
generator=kicad_fp.Atom('GerbonaraTwistedCoilGenV1'),
|
|
layer='F.Cu',
|
|
descr=f"{turns} turn {outer_diameter:.2f} mm diameter twisted coil footprint, inductance approximately {L:.6f} µH. Generated by gerbonara'c Twisted Coil generator, version {__version__}.",
|
|
clearance=clearance,
|
|
zone_connect=0,
|
|
lines=lines,
|
|
arcs=arcs,
|
|
pads=pads,
|
|
zones=zones,
|
|
)
|
|
|
|
if clipboard:
|
|
try:
|
|
data = obj.serialize()
|
|
print(f'Running {copy[0]}.', file=sys.stderr)
|
|
proc = subprocess.Popen(copy, stdin=subprocess.PIPE, text=True)
|
|
proc.communicate(data)
|
|
print('passed to wl-clip:', data)
|
|
except FileNotFoundError:
|
|
print(f'Error: --clipboard requires the {copy[0]} and {paste[0]} utilities from {cliputil} to be installed.', file=sys.stderr)
|
|
elif not outfile:
|
|
print(obj.serialize())
|
|
else:
|
|
obj.write(outfile)
|
|
|
|
if __name__ == '__main__':
|
|
generate()
|