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Diffstat (limited to 'coil_gen.py')
| -rw-r--r-- | coil_gen.py | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/coil_gen.py b/coil_gen.py new file mode 100644 index 0000000..4dd0847 --- /dev/null +++ b/coil_gen.py @@ -0,0 +1,100 @@ +#!/usr/bin/env python3 + +from math import * +from pathlib import Path +from itertools import cycle + +from gerbonara.cad.kicad import pcb as kicad_pcb +from gerbonara.cad.kicad import graphical_primitives as kicad_gr +import click + + +def point_line_distance(p, l1, l2): + x0, y0 = p + x1, y1 = l1 + x2, y2 = l2 + # https://en.wikipedia.org/wiki/Distance_from_a_point_to_a_line + return abs((x2-x1)*(y1-y0) - (x1-x0)*(y2-y1)) / sqrt((x2-x1)**2 + (y2-y1)**2) + + +@click.command() +@click.argument('infile', type=click.Path(exists=True, dir_okay=False, path_type=Path)) +@click.argument('outfile', type=click.Path(writable=True, dir_okay=False, path_type=Path)) +@click.option('--polygon', type=int, default=0, help="Use n'th polygon instead of first one. 0-based index.") +@click.option('--start-angle', type=float, default=0, help='Angle for the start at the outermost layer of the spiral in degree') +@click.option('--stop-radius', type=float, default=1, help='Inner radius of spiral') +@click.option('--trace-width', type=float, default=0.15) +@click.option('--clearance', type=float, default=0.15) +def generate(infile, outfile, polygon, start_angle, stop_radius, trace_width, clearance): + board = kicad_pcb.Board.open(infile) + objs = [obj for obj in board.objects() if isinstance(obj, kicad_gr.Polygon)] + print(f'Found {len(objs)} polygon(s).') + poly = objs[polygon] + xy = [(pt.x, pt.y) for pt in poly.pts.xy] + segments = list(zip(xy, xy[1:] + xy[:1])) + + vbx, vby = min(x for x, y in xy), min(y for x, y, in xy) + vbw, vbh = max(x for x, y in xy), max(y for x, y, in xy) + vbw, vbh = vbw-vbx, vbh-vby + + vbx -= 5 + vby -= 5 + vbw += 10 + vbh += 10 + + cx, cy = 0, 0 + ls = 0 + for (x1, y1), (x2, y2) in segments: + l = dist((x1, y1), (x2, y2)) + cx += x1*l/2 + x2*l/2 + cy += y1*l/2 + y2*l/2 + ls += l + cx /= ls + cy /= ls + + segment_angles = [(atan2(y1-cy, x1-cx) - atan2(y2-cy, x2-cx) + 2*pi) % (2*pi) for (x1, y1), (x2, y2) in segments] + angle_strs = [f'{degrees(a):.2f}' for a in segment_angles] + print(f'Segment angles: {" ".join(angle_strs)}') + print(f'Sum of segment angles: {degrees(sum(segment_angles)):.2f}') + + segment_heights = [point_line_distance((cx, cy), (x1, y1), (x2, y2)) for (x1, y1), (x2, y2) in segments] + + smallest_radius = min(segment_heights) + #trace_radius = smallest_radius - stop_radius + trace_radius = smallest_radius + num_windings = floor((trace_radius - trace_width) / (clearance + trace_width)) + print(f'Going for {num_windings} windings') + + spiral_points = [] + r_now = 0 + for winding in range(num_windings): + for angle, ((x1, y1), (x2, y2)) in zip(segment_angles, segments): + angle_frac = angle/(2*pi) + d_r = angle_frac * (clearance + trace_width) + r_pt = dist((cx, cy), (x1, y1)) * (num_windings - winding) / num_windings + + x1, y1 = x1-cx, y1-cy + x2, y2 = x2-cx, y2-cy + l1, l2 = hypot(x1, y1), hypot(x2, y2) + x1, y1 = x1/l1, y1/l1 + x2, y2 = x2/l2, y2/l2 + + r_now += d_r + spiral_points.append((cx + x1*r_pt, cy + y1*r_pt)) + + path_d = ' '.join([f'M {xy[0][0]} {xy[0][1]}', *[f'L {x} {y}' for x, y in xy[1:]], 'Z']) + path_d2 = ' '.join(f'M {cx} {cy} L {x} {y}' for x, y in xy) + path_d3 = ' '.join([f'M {spiral_points[0][0]} {spiral_points[0][1]}', *[f'L {x} {y}' for x, y in spiral_points[1:]]]) + + with open('/tmp/test.svg', '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="200mm" height="200mm" viewBox="{vbx} {vby} {vbw} {vbh}" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">>\n') + f.write(f'<path fill="none" stroke="#303030" stroke-width="0.05" d="{path_d}"/>\n') + f.write(f'<path fill="none" stroke="#a0a0a0" stroke-width="0.05" d="{path_d2}"/>\n') + f.write(f'<path fill="none" stroke="#ff00ff" stroke-width="{trace_width}" d="{path_d3}"/>\n') + f.write(f'<circle r="0.1" fill="red" stroke="none" cx="{cx}" cy="{cy}"/>\n') + f.write('</svg>\n') + +if __name__ == '__main__': + generate() |