summaryrefslogtreecommitdiff
path: root/coil_gen.py
blob: 78610d23272700126c372556dc0ce0433dd2b610 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
#!/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)

def line_line_intersection(l1, l2):
    p1, p2 = l1
    p3, p4 = l2
    x1, y1 = p1
    x2, y2 = p2
    x3, y3 = p3
    x4, y4 = p4
    
    # https://en.wikipedia.org/wiki/Line%E2%80%93line_intersection
    px = ((x1*y2-y1*x2)*(x3-x4)-(x1-x2)*(x3*y4-y3*x4))/((x1-x2)*(y3-y4)-(y1-y2)*(x3-x4))
    py = ((x1*y2-y1*x2)*(y3-y4)-(y1-y2)*(x3*y4-y3*x4))/((x1-x2)*(y3-y4)-(y1-y2)*(x3-x4))
    return px, py


@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]
    segment_foo = list(zip(segment_heights, segments))

    midpoints = []
    for h, ((x1, y1), (x2, y2)) in segment_foo:
        xb = (x1 + x2) / 2
        yb = (y1 + y2) / 2
        midpoints.append((xb, yb))

    normals = []
    for h, ((x1, y1), (x2, y2)) in segment_foo:
        d12 = dist((x1, y1), (x2, y2))
        dx = x2 - x1
        dy = y2 - y1
        normals.append((-dy/d12, dx/d12))

    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')

    segment_foo = list(zip(segment_heights, segments, segment_angles, midpoints, normals))

    dbg_lines1, dbg_lines2 = [], []
    spiral_points = []
    dr_tot = 0
    for n in range(num_windings):
        for (ha, (pa1, pa2), aa, ma, na), (hb, (pb1, pb2), ab, mb, nb) in zip(segment_foo[-1:] + segment_foo[:-1], segment_foo):
            pitch = clearance + trace_width
            dr_tot_a = dr_tot
            dr_tot_b = dr_tot + ab/(2*pi) * pitch

            xma, yma = ma
            xna, yna = na
            xmb, ymb = mb
            xnb, ynb = nb

            xa1, ya1 = pa1
            xa2, ya2 = pa2
            xb1, yb1 = pb1
            xb2, yb2 = pb2

            dma = dist(pa2, ma)
            dmb = dist(pb1, mb)

            x_cons_a, y_cons_a = p_cons_a = line_line_intersection((pa2, (cx, cy)), (ma, (xma-xna, yma-yna)))
            d_cons_a = dist(p_cons_a, ma)
            qa = dma * dr_tot_a / d_cons_a
            dra = hypot(qa, dr_tot_a)

            nrax = (xa2 - cx) / dist((cx, cy), pa2)
            nray = (ya2 - cy) / dist((cx, cy), pa2)

            xea = xa2 - nrax*dra
            yea = ya2 - nray*dra

            x_cons_b, y_cons_b = p_cons_b = line_line_intersection((pb1, (cx, cy)), (mb, (xmb-xnb, ymb-ynb)))
            d_cons_b = dist(p_cons_b, mb)
            qb = dmb * dr_tot_b / d_cons_b
            drb = hypot(qb, dr_tot_b)

            nrbx = (xb1 - cx) / dist((cx, cy), pb1)
            nrby = (yb1 - cy) / dist((cx, cy), pb1)

            xeb = xb1 - nrbx*drb
            yeb = yb1 - nrby*drb

            xsa = xma - xna*dr_tot_a
            ysa = yma - yna*dr_tot_a

            xsb = xmb - xnb*dr_tot_b
            ysb = ymb - ynb*dr_tot_b

            l1 = (xsa, ysa), (xea, yea)
            l2 = (xsb, ysb), (xeb, yeb)

            dbg_lines1.append(l1)
            dbg_lines2.append(l2)

            pic = line_line_intersection(l1, l2)
            spiral_points.append(pic)

            dr_tot = dr_tot_b

    #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" opacity="0.5" stroke-width="{trace_width}" d="{path_d3}"/>\n')

        for (x1, y1), (x2, y2) in dbg_lines1:
            f.write(f'<path fill="none" stroke="#ff0000" opacity="0.2" stroke-width="0.05" d="M {x1} {y1} L {x2} {y2}"/>')

        for (x1, y1), (x2, y2) in dbg_lines2:
            f.write(f'<path fill="none" stroke="#0000ff" opacity="0.2" stroke-width="0.05" d="M {x1} {y1} L {x2} {y2}"/>')

        for x, y in midpoints:
            f.write(f'<path fill="none" stroke="#a0a0ff" stroke-width="0.05" d="M {cx} {cy} L {x} {y}"/>')
            f.write(f'<circle r="0.1" fill="blue" stroke="none" cx="{x}" cy="{y}"/>\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()