summaryrefslogtreecommitdiff
path: root/mesh_dialog.py
blob: 0cce91272e113a6c9125a3e229634e8bb0d65a73 (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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
from collections import defaultdict
import dataclasses
from contextlib import contextmanager
import textwrap
import random
import math
from itertools import count, islice
import json
import re
from os import path

import wx

import pcbnew

import matplotlib.cm
import shapely
from shapely import geometry
from shapely.geometry import polygon
from shapely import affinity
import shapely.ops

from . import mesh_plugin_dialog

class GeneratorError(ValueError):
    pass

class AbortError(SystemError):
    pass

@dataclasses.dataclass
class GeneratorSettings:
    edge_clearance: float = 1.5   # mm
    anchor:         str   = None  # Footprint designator
    chamfer:        float = 0.0   # unit fraction
    mask_layer_id:  int   = 0     # kicad layer id, populated later
    random_seed:    str   = None
    randomness:     float = 1.0

    def serialize(self):
        d = dataclasses.asdict(self)
        d['kimesh_settings_version'] = '1.0.0'
        return json.dumps(d).encode()

    @classmethod
    def deserialize(cls, data):
        d = json.loads(data.decode())
        version = d.pop('kimesh_settings_version')
        vtup = tuple(map(int, version.split('.')))
        if vtup > (2, 0, 0):
            raise cls.VersionError("Project kimesh settings file is too new for this plugin's version.")
        return cls(**d)

    class VersionError(ValueError):
        pass


class MeshPluginMainDialog(mesh_plugin_dialog.MainDialog):
    def __init__(self, board):
        mesh_plugin_dialog.MainDialog.__init__(self, None)
        self.board = board

        self.m_cancelButton.Bind(wx.EVT_BUTTON, self.quit)
        self.m_removeButton.Bind(wx.EVT_BUTTON, self.confirm_tearup_mesh)
        self.m_generateButton.Bind(wx.EVT_BUTTON, self.generate_mesh)
        self.m_net_prefix.Bind(wx.EVT_TEXT, self.update_net_label)

        self.tearup_confirm_dialog = wx.MessageDialog(self, "", style=wx.YES_NO | wx.NO_DEFAULT)

        self.nets = { str(wxs) for wxs, netinfo in board.GetNetsByName().items() }
        self.update_net_label(None)

        self.Fit()

        settings = None
        if path.isfile(self.settings_fn()):
            with open(self.settings_fn(), 'rb') as f:
                try:
                    settings = GeneratorSettings.deserialize(f.read())
                except GeneratorSettings.VersionError as e:
                    wx.MessageDialog(self, "Cannot load settings: {}.".format(e), "File I/O error").ShowModal()

        for i in range(pcbnew.PCB_LAYER_ID_COUNT):
            name = board.GetLayerName(i)
            self.m_maskLayerChoice.Append(name)
            if name == 'User.Eco1':
                self.m_maskLayerChoice.SetSelection(i)

        def sort_key(fp):
            ref = fp.GetReference()
            parts = re.findall(r'[0-9]+|[^0-9]+', ref)
            return tuple(int(part) if part.isnumeric() else part for part in parts)

        self.fps = sorted(self.board.Footprints(), key=sort_key)
        for i, fp in enumerate(self.fps):
            ref = fp.GetReference()
            self.m_anchorChoice.Append(ref)
            if settings and ref == settings.anchor:
                self.m_anchorChoice.SetSelection(i)

        if settings:
            self.m_chamferSpin.Value = settings.chamfer*100.0
            self.m_maskLayerChoice.SetSelection(settings.mask_layer_id)
            self.m_seedInput.Value = settings.random_seed or ''
            self.m_randomnessSpin.Value = settings.randomness*100.0
            self.m_edgeClearanceSpin.Value = settings.edge_clearance

        self.SetMinSize(self.GetSize())

    def get_matching_nets(self):
        prefix = self.m_net_prefix.Value
        return { net for net in self.nets if net.startswith(prefix) }

    def confirm_tearup_mesh(self, evt):
        matching = self.get_matching_nets()

        if not str(self.m_net_prefix.Value):
            message = "You have set an empty net prefix. This will match ALL {} nets on the board. Do you really want to tear up all tracks? This cannot be undone!"

        else:
            message = "Do you really want to tear up all traces of the {} matching nets on this board? This step cannot be undone!"

        message = message.format(len(matching)) + "\n\nMatching nets:\n" + ", ".join(
                '""' if not netname else (netname[:16] + '...' if len(netname) > 16 else netname)
                for netname in (sorted(matching)[:5] + ['...'] if len(matching) > 5 else [])
        )
        self.tearup_confirm_dialog.SetMessage(message)
        self.tearup_confirm_dialog.SetYesNoLabels("Tear up {} traces".format(len(matching)), "Close")

        if self.tearup_confirm_dialog.ShowModal() == wx.ID_YES:
            self.tearup_mesh(matching)

    def tearup_mesh(self, matching=None):
        count = 0
        anchor, target_layer_id = self.get_anchor()
        for track in self.board.GetTracks():
            if matching is not None and track.GetNet().GetNetname() not in matching:
                continue

            if track.GetLayer() != target_layer_id:
                continue

            count += 1
            self.board.Remove(track)
        print(f'Tore up {count} trace segments.')

    def settings_fn(self):
        return path.join(path.dirname(self.board.GetFileName()), 'last_kimesh_settings.json')

    def get_anchor(self):
        ref = str(self.fps[self.m_anchorChoice.GetSelection()].GetReference())
        footprints = [ fp for fp in self.board.Footprints() if fp.GetReference() == ref ]
        if len(footprints) == 0:
            wx.MessageDialog(self, f'Error: Could not find anchor footprint "{ref}".').ShowModal()
            raise ValueError()
        if len(footprints) > 1:
            wx.MessageDialog(self, f'Error: Multiple footprints with anchor footprint reference "{ref}".').ShowModal()
            raise ValueError()
        anchor = footprints[0]
        pad0, *_ = anchor.Pads()
        lset = pad0.GetLayerSet()
        target_layer_id, *_ = [l for l in lset.CuStack() if lset.Contains(l)]
        return anchor, target_layer_id

    def generate_mesh(self, evt):
        try:
            settings = GeneratorSettings(
                edge_clearance = float(self.m_edgeClearanceSpin.Value),
                anchor      = str(list(self.board.Footprints())[self.m_anchorChoice.GetSelection()].GetReference()),
                chamfer     = float(self.m_chamferSpin.Value)/100.0,
                mask_layer_id   = self.m_maskLayerChoice.GetSelection(),
                random_seed = str(self.m_seedInput.Value) or None,
                randomness  = float(self.m_randomnessSpin.Value)/100.0)
        except ValueError as e:
            return wx.MessageDialog(self, "Invalid input value: {}.".format(e), "Invalid input").ShowModal()

        try:
            with open(self.settings_fn(), 'wb') as f:
                f.write(settings.serialize())
                print('Saved settings to', f.name)
        except:
            wx.MessageDialog(self, "Cannot save settings: {}.".format(e), "File I/O error").ShowModal()


        anchor, target_layer_id = self.get_anchor()

        mesh_zones = []
        for drawing in self.board.GetDrawings():
            if drawing.GetLayer() == settings.mask_layer_id:
                mesh_zones.append(drawing.GetPolyShape())

        if not mesh_zones:
                return wx.MessageDialog(self, "Error: Could not find any mesh zones on the outline pattern layer.").ShowModal()

        keepouts = []
        for zone in self.board.Zones():
            if zone.GetDoNotAllowCopperPour() and zone.GetLayerSet().Contains(target_layer_id):
                keepouts.append(zone.Outline())
        print(f'Found {len(keepouts)} keepout areas.')

        outlines = pcbnew.SHAPE_POLY_SET()
        self.board.GetBoardPolygonOutlines(outlines)
        board_outlines = list(self.poly_set_to_shapely(outlines))
        board_mask = shapely.ops.unary_union(board_outlines)
        board_mask = board_mask.buffer(-settings.edge_clearance)

        zone_outlines = [ outline for zone in mesh_zones for outline in self.poly_set_to_shapely(zone) ]
        zone_mask = shapely.ops.unary_union(zone_outlines)
        mask = zone_mask.intersection(board_mask)

        keepout_outlines = [ outline for zone in keepouts for outline in self.poly_set_to_shapely(zone) ]
        keepout_mask = shapely.ops.unary_union(keepout_outlines)
        mask = shapely.difference(mask, keepout_mask)

        try:
            def warn(msg):
                dialog = wx.MessageDialog(self, msg + '\n\nDo you want to abort mesh generation?',
                        "Mesh Generation Warning").ShowModal()
                dialog = wx.MessageDialog(self, "", style=wx.YES_NO | wx.NO_DEFAULT)
                dialog.SetYesNoLabels("Abort", "Ignore and continue")

                if self.tearup_confirm_dialog.ShowModal() == wx.ID_YES:
                    raise AbortError()

            self.generate_mesh_backend(mask, anchor, net_prefix=str(self.m_net_prefix.Value), target_layer_id=target_layer_id, warn=warn, settings=settings)

        except GeneratorError as e:
            return wx.MessageDialog(self, str(e), "Mesh Generation Error").ShowModal()
        except AbortError:
            pass

    def poly_set_to_shapely(self, poly_set):
        for i in range(poly_set.OutlineCount()):
            outline = poly_set.Outline(i)

            def shape_line_chain_to_coords(line_chain):
                points = []
                for j in range(line_chain.PointCount()):
                    point = line_chain.CPoint(j)
                    points.append((pcbnew.ToMM(point.x), pcbnew.ToMM(point.y)))
                return points

            exterior = shape_line_chain_to_coords(outline)
            interiors = [ shape_line_chain_to_coords(poly_set.Hole(i, j)) for j in range(poly_set.HoleCount(i)) ]
            yield polygon.Polygon(exterior, interiors)

    def generate_mesh_backend(self, mask, anchor, net_prefix, target_layer_id, warn=lambda s: None, settings=GeneratorSettings()):
        anchor_outlines = list(self.poly_set_to_shapely(anchor.GetBoundingHull()))
        if len(anchor_outlines) == 0:
            raise GeneratorError('Could not find any outlines for anchor {}'.format(anchor.GetReference()))
        if len(anchor_outlines) > 1:
            warn('Anchor {} has multiple outlines. Using first outline for trace start.')
        anchor_pads = list(sorted(anchor.Pads(), key=lambda pad: int(pad.GetNumber())))

        trace_width = pcbnew.ToMM(anchor_pads[0].GetSize()[0])
        space_width = pcbnew.ToMM(math.dist(anchor_pads[0].GetPosition(), anchor_pads[1].GetPosition())) - trace_width
        num_traces = len(anchor_pads)
        assert num_traces%4 == 0
        num_traces //= 4
        nets = [f'{net_prefix}{i}' for i in range(num_traces)]

        width_per_trace = trace_width + space_width
        grid_cell_width = width_per_trace * num_traces * 2

        x0, y0 = anchor_pads[len(anchor_pads)//2].GetPosition()
        x0, y0 = pcbnew.ToMM(x0), pcbnew.ToMM(y0)
        xl, yl = anchor_pads[-1].GetPosition()
        xl, yl = pcbnew.ToMM(xl), pcbnew.ToMM(yl)

        mesh_angle = math.atan2(xl-x0, yl-y0)
        print('mesh angle is', math.degrees(mesh_angle))
        len_along = - width_per_trace/2
        x0 += len_along * math.sin(mesh_angle)
        y0 += len_along * math.cos(mesh_angle)

        mask_xformed = affinity.translate(mask, -x0, -y0)
        mask_xformed = affinity.rotate(mask_xformed, -mesh_angle, origin=(0, 0), use_radians=True)
        bbox = mask_xformed.bounds

        grid_x0, grid_y0 = math.floor(bbox[0]/grid_cell_width), math.floor(bbox[1]/grid_cell_width)
        grid_origin = grid_x0*grid_cell_width, grid_y0*grid_cell_width
        grid_rows = int(math.ceil((bbox[3] - grid_origin[1]) / grid_cell_width))
        grid_cols = int(math.ceil((bbox[2] - grid_origin[0]) / grid_cell_width))
        print(f'generating grid of size {grid_rows} * {grid_cols} with origin {grid_x0}, {grid_y0}')

        grid = []
        for y in range(grid_y0, grid_y0+grid_rows):
            row = []
            for x in range(grid_x0, grid_x0+grid_cols):
                cell = polygon.Polygon([(0, 0), (0, 1), (1, 1), (1, 0)])
                cell = affinity.scale(cell, grid_cell_width, grid_cell_width, origin=(0, 0))
                cell = affinity.translate(cell, x*grid_cell_width, y*grid_cell_width)
                cell = affinity.rotate(cell, mesh_angle, origin=(0, 0), use_radians=True)
                cell = affinity.translate(cell, x0, y0)
                row.append(cell)
            grid.append(row)

        num_valid = 0
        with DebugOutput('dbg_grid.svg') as dbg:
            dbg.add(mask, color='#00000020')

            for y, row in enumerate(grid, start=grid_y0):
                for x, cell in enumerate(row, start=grid_x0):
                    if mask.contains(cell):
                        if x == 0 and y == 0: # exit cell
                            color = '#ff00ff80'
                        else:
                            num_valid += 1
                            color = '#00ff0080'
                    elif mask.overlaps(cell):
                        color = '#ffff0080'
                    else:
                        color = '#ff000080'
                    dbg.add(cell, color=color)

            for foo in anchor_outlines:
                dbg.add(foo, color='#0000ff00', stroke_width=0.05, stroke_color='#000000ff')

            dbg.add([[(x0-2, y0), (x0+2, y0)], [(x0, y0-2), (x0, y0+2)]], color='none', stroke_width=0.05, stroke_color='#ff0000ff')

        def is_valid(cell):
            if not mask.contains(cell):
                return False
            return True

        def iter_neighbors(x, y):
            if x > grid_x0:
                yield x-1, y, 0b0100
            if x - grid_x0 < grid_cols:
                yield x+1, y, 0b0001
            if y > grid_y0:
                yield x, y-1, 0b1000
            if y - grid_y0 < grid_rows:
                yield x, y+1, 0b0010

        def reciprocal(mask):
            return {
                    0b0001: 0b0100,
                    0b0010: 0b1000,
                    0b0100: 0b0001,
                    0b1000: 0b0010,
                    0b0000: 0b0000
                    }[mask]

        rnd_state = random.Random(settings.random_seed)
        def skewed_random_iter(it, mask, randomness):
            l = list(it)
            if rnd_state.random() < 1.0 - randomness:
                for x, y, m in l:
                    if m == mask:
                        yield x, y, m
                        break
                l.remove((x, y, m))
            rnd_state.shuffle(l)
            yield from l

        def add_track(segment:geometry.LineString, net=None):
            coords = list(segment.coords)
            for (x1, y1), (x2, y2) in zip(coords, coords[1:]):
                if (x1, y1) == (x2, y2): # zero-length track due to zero chamfer
                    continue
                track = pcbnew.PCB_TRACK(self.board)
                #track.SetStatus(track.GetStatus() | pcbnew.TRACK_AR)
                track.SetStart(pcbnew.VECTOR2I(pcbnew.FromMM(x1), pcbnew.FromMM(y1)))
                track.SetEnd(pcbnew.VECTOR2I(pcbnew.FromMM(x2), pcbnew.FromMM(y2)))
                track.SetWidth(pcbnew.FromMM(trace_width))
                track.SetLayer(target_layer_id)
                if net is not None:
                    track.SetNet(net)
                self.board.Add(track)

        netinfos = []
        for name in nets:
            ni = pcbnew.NETINFO_ITEM(self.board, name)
            self.board.Add(ni)
            netinfos.append(ni)

        not_visited = { (x, y) for x in range(grid_x0, grid_x0+grid_cols) for y in range(grid_y0, grid_y0+grid_rows) if is_valid(grid[y-grid_y0][x-grid_x0]) }
        num_to_visit = len(not_visited)
        track_count = 0
        with DebugOutput('dbg_cells.svg') as dbg_cells,\
             DebugOutput('dbg_composite.svg') as dbg_composite,\
             DebugOutput('dbg_tiles.svg') as dbg_tiles,\
             DebugOutput('dbg_traces.svg') as dbg_traces:
            dbg_cells.add(mask, color='#00000020')
            dbg_composite.add(mask, color='#00000020')
            dbg_traces.add(mask, color='#00000020')
            dbg_tiles.add(mask, color='#00000020')
            
            TILE_COLORS = {
                0b0000: '#ffcc00ff',
                0b0001: '#d40000ff',
                0b0010: '#d40000ff',
                0b0011: '#ff6600ff',
                0b0100: '#d40000ff',
                0b0101: '#00d400ff',
                0b0110: '#ff6600ff',
                0b0111: '#00ccffff',
                0b1000: '#d40000ff',
                0b1001: '#ff6600ff',
                0b1010: '#00d400ff',
                0b1011: '#00ccffff',
                0b1100: '#ff6600ff',
                0b1101: '#00ccffff',
                0b1110: '#00ccffff',
                0b1111: '#ffcc00ff'}
            x, y = -1, 0
            visited = 0
            key = 0
            entry_dir = 0b0001
            stack = []
            depth = 0
            max_depth = 0
            i = 0
            past_tiles = {}
            def dump_output(i):
                with DebugOutput(f'per-tile/step{i}.svg') as dbg_per_tile:
                    dbg_per_tile.add(mask, color='#00000020')
                    for foo in anchor_outlines:
                        dbg_per_tile.add(foo, color='#00000080', stroke_width=0.05, stroke_color='#00000000')
                        
                    for le_y, row in enumerate(grid):
                        for le_x, cell in enumerate(row):
                            if mask.contains(cell):
                                if cell == exit_cell[0]:
                                    color = '#ff00ff80'
                                elif any(ol.overlaps(cell) for ol in anchor_outlines):
                                    color = '#ffff0080'
                                elif any(ol.contains(cell) for ol in anchor_outlines):
                                    color = '#ff000080'
                                else:
                                    color = '#00ff0080'
                            elif mask.overlaps(cell):
                                color = '#ffff0080'
                            else:
                                color = '#ff000080'
                            dbg_per_tile.add(cell, color=color)

                    for (le_x, le_y), (stroke_color, segments) in past_tiles.items():
                        for segment in segments:
                            segment = affinity.scale(segment, grid_cell_width, grid_cell_width, origin=(0, 0))
                            segment = affinity.translate(segment, le_x*grid_cell_width, le_y*grid_cell_width)
                            segment = affinity.rotate(segment, mesh_angle, origin=(0, 0), use_radians=True)
                            segment = affinity.translate(segment, x0, y0)
                            dbg_per_tile.add(segment, stroke_width=trace_width, color='#ff000000', stroke_color=stroke_color)

            armed = False
            while not_visited or stack:
                for n_x, n_y, bmask in skewed_random_iter(iter_neighbors(x, y), entry_dir, settings.randomness):
                    if (n_x, n_y) in not_visited:
                        dbg_composite.add(grid[n_y-grid_y0][n_x-grid_x0], color=('visit_depth', depth), opacity=1.0)
                        dbg_cells.add(grid[n_y-grid_y0][n_x-grid_x0], color=('visit_depth', depth), opacity=1.0)
                        key |= bmask
                        stack.append((x, y, key, bmask, depth))
                        not_visited.remove((n_x, n_y))
                        visited += 1
                        depth += 1
                        i += 1
                        armed = True
                        max_depth = max(depth, max_depth)

                        past_tiles[x, y] = (TILE_COLORS[key],
                                [segment
                                    for segment, _net in Pattern.render(key, num_traces, settings.chamfer) ])

                        x, y, key, entry_dir = n_x, n_y, reciprocal(bmask), bmask
                        #dump_output(i)
                        break
                else:
                    stroke_color = TILE_COLORS[key]
                    past_tiles[x, y] = (stroke_color,
                            [segment for segment, _net in Pattern.render(key, num_traces, settings.chamfer) ])
                    for segment, net in Pattern.render(key, num_traces, settings.chamfer):
                        if is_valid(grid[y-grid_y0][x-grid_x0]):
                            segment = affinity.scale(segment, grid_cell_width, grid_cell_width, origin=(0, 0))
                            segment = affinity.translate(segment, x*grid_cell_width, y*grid_cell_width)
                            segment = affinity.rotate(segment, mesh_angle, origin=(0, 0), use_radians=True)
                            segment = affinity.translate(segment, x0, y0)
                            dbg_composite.add(segment, stroke_width=trace_width, color='#ff000000', stroke_color='#ffffff60')
                            dbg_traces.add(segment, stroke_width=trace_width, color='#ff000000', stroke_color='#000000ff')
                            dbg_tiles.add(segment, stroke_width=trace_width, color='#ff000000', stroke_color=stroke_color)
                            add_track(segment, netinfos[net]) # FIXME (works, disabled for debug)
                            track_count += 1
                    if not stack:
                        break
                    if armed:
                        i += 1
                        #dump_output(i)
                        armed = False
                    *stack, (x, y, key, entry_dir, depth) = stack

            dbg_cells.scale_colors('visit_depth', max_depth)
            dbg_composite.scale_colors('visit_depth', max_depth)

            for foo in anchor_outlines:
                dbg_cells.add(foo, color='#00000080', stroke_width=0.05, stroke_color='#00000000')
                dbg_traces.add(foo, color='#00000080', stroke_width=0.05, stroke_color='#00000000')
                dbg_composite.add(foo, color='#00000080', stroke_width=0.05, stroke_color='#00000000')
                dbg_tiles.add(foo, color='#00000080', stroke_width=0.05, stroke_color='#00000000')


        print(f'Added {track_count} trace segments.')

        #pcbnew.Refresh()
        #self.tearup_mesh()
        # TODO generate

    def update_net_label(self, evt):
        self.m_netLabel.SetLabel('Like: ' + ', '.join(f'{self.m_net_prefix.Value}{i}' for i in range(3)) + ', ...')

    def quit(self, evt):
        self.Destroy()


class Pattern:
    @staticmethod
    def render(key, n, cd=0):
        yield from Pattern.LUT[key](n, cd=math.tan(math.pi/8) * cd)
    
    def draw_I(n, cd):
        for i in range(n):
            sp = (i+0.5) * (1/(2*n))
            yield geometry.LineString([(sp, 0), (sp, 1)]), i
            sp = (2*n-1-i+0.5) * (1/(2*n))
            yield geometry.LineString([(sp, 0), (sp, 1)]), i

    def draw_U(n, cd):
        pitch = (1/(2*n))
        cd *= pitch # chamfer depth
        for i in range(n):
            sp = (i+0.5) * pitch
            yield geometry.LineString([(sp, 0), (sp, 1-sp-cd), (sp+cd, 1-sp), (1-sp-cd, 1-sp), (1-sp, 1-sp-cd), (1-sp, 0)]), i

    def draw_L(n, cd):
        pitch = (1/(2*n))
        cd *= pitch # chamfer depth
        for i in range(n):
            sp = (i+0.5) * pitch
            yield geometry.LineString([(sp, 0), (sp, 1-sp-cd), (sp+cd, 1-sp), (1, 1-sp)]), i
            sp = (2*n-1-i+0.5) * pitch
            yield geometry.LineString([(sp, 0), (sp, 1-sp-cd), (sp+cd, 1-sp), (1, 1-sp)]), i
    
    def draw_T(n, cd):
        pitch = (1/(2*n))
        cd *= pitch # chamfer depth
        for i in range(n):
            sp = (i+0.5) * pitch
            # through line
            yield geometry.LineString([(0, sp), (1, sp)]), i
            # two corners on the opposite side
            yield geometry.LineString([(0, 1-sp), (sp-cd, 1-sp), (sp, 1-sp+cd), (sp, 1)]), i
            yield geometry.LineString([(1-sp, 1), (1-sp, 1-sp+cd), (1-sp+cd, 1-sp), (1, 1-sp)]), i

    def draw_X(n, cd):
        pitch = (1/(2*n))
        cd *= pitch # chamfer depth
        for i in range(n):
            sp = (i+0.5) * pitch
            yield geometry.LineString([(0, sp), (sp-cd, sp), (sp, sp-cd), (sp, 0)]), i
            yield geometry.LineString([(1-sp, 0), (1-sp, sp-cd), (1-sp+cd, sp), (1, sp)]), i
            yield geometry.LineString([(0, 1-sp), (sp-cd, 1-sp), (sp, 1-sp+cd), (sp, 1)]), i
            yield geometry.LineString([(1-sp, 1), (1-sp, 1-sp+cd), (1-sp+cd, 1-sp), (1, 1-sp)]), i

    def rotate(pattern, deg):
        def wrapper(n, *args, **kwargs):
            for segment, net in pattern(n, *args, **kwargs):
                yield affinity.rotate(segment, deg, origin=(0.5, 0.5)), net
        return wrapper

    def raise_error(n, *args, **kwargs):
        #raise ValueError('Tried to render invalid cell. This is a bug.')
        return []

    LUT = {
            0b0000: raise_error,
            0b0001: rotate(draw_U, 90),
            0b0010: rotate(draw_U, 180),
            0b0011: rotate(draw_L, 90),
            0b0100: rotate(draw_U, -90),
            0b0101: rotate(draw_I, -90),
            0b0110: rotate(draw_L, 180),
            0b0111: draw_T,
            0b1000: draw_U,
            0b1001: draw_L,
            0b1010: draw_I,
            0b1011: rotate(draw_T, -90),
            0b1100: rotate(draw_L, -90),
            0b1101: rotate(draw_T, 180),
            0b1110: rotate(draw_T, 90),
            0b1111: draw_X
    }


def virihex(val, max=1.0, alpha=1.0):
    r, g, b, _a = matplotlib.cm.viridis(val/max)
    r, g, b, a = [ int(round(0xff*c)) for c in [r, g, b, alpha] ]
    return f'#{r:02x}{g:02x}{b:02x}{a:02x}'

@contextmanager
def DebugOutput(filename):
    filename = path.join('/tmp', filename)
    with open(filename, 'w') as f:
        wrapper = DebugOutputWrapper(f)
        yield wrapper
        wrapper.save()

class DebugOutputWrapper:
    def __init__(self, f):
        self.f = f
        self.objs = []

    def scale_colors(self, group, max_value):
        self.objs = [
                (obj,
                    (virihex(color[1], max=max_value) if isinstance(color, tuple) and color[0] == group else color,
                        *rest))
            for obj, (color, *rest) in self.objs ]

    def add(self, obj, color=None, stroke_width=0, stroke_color=None, opacity=1.0):
        self.objs.append((obj, (color, stroke_color, stroke_width, opacity)))

    def gen_svg(self, obj, fill_color=None, stroke_color=None, stroke_width=None, opacity=1.0):
        fill_color = fill_color or '#ff0000aa'
        stroke_color = stroke_color or '#000000ff'
        stroke_width = 0 if stroke_width is None else stroke_width

        if isinstance(obj, geometry.MultiPolygon):
            out = ''
            for geom in obj.geoms:
                out += self.gen_svg(geom, fill_color, stroke_color, stroke_width, opacity)
            return out

        elif isinstance(obj, polygon.Polygon):
            exterior_coords = [ ["{},{}".format(*c) for c in obj.exterior.coords] ]
            interior_coords = [ ["{},{}".format(*c) for c in interior.coords] for interior in obj.interiors ]
            all_coords = exterior_coords + interior_coords
            path = " ".join([
                "M {0} L {1} z".format(coords[0], " L ".join(coords[1:]))
                for coords in all_coords])

        elif isinstance(obj, geometry.LineString):
            all_coords = [ ["{},{}".format(*c) for c in obj.coords] ]
            path = " ".join([
                "M {0} L {1}".format(coords[0], " L ".join(coords[1:]))
                for coords in all_coords])

        elif isinstance(obj, list):
            all_coords = [ [f'{x},{y}' for x, y in seg] for seg in obj ]
            path = " ".join([
                "M {0} L {1}".format(coords[0], " L ".join(coords[1:]))
                for coords in all_coords])

        else:
            raise ValueError(f'Unhandled shapely object type {type(obj)}')

        return (f'<path fill-rule="evenodd" fill="{fill_color}" opacity="{opacity}" stroke="{stroke_color}" '
                f'stroke-width="{stroke_width}" d="{path}" />')
    
    def save(self, margin:'unit'=5, scale:'px/unit'=10):
        #specify margin in coordinate units
        margin = 5

        bboxes = [ list(obj.bounds) for obj, _style in self.objs if not isinstance(obj, list) ]
        min_x = min( bbox[0] for bbox in bboxes ) - margin
        min_y = min( bbox[1] for bbox in bboxes ) - margin
        max_x = max( bbox[2] for bbox in bboxes ) + margin
        max_y = max( bbox[3] for bbox in bboxes ) + margin

        width = max_x - min_x
        height = max_y - min_y

        props = {
            'version': '1.1',
            'baseProfile': 'full',
            'width': '{width:.0f}px'.format(width = width*scale),
            'height': '{height:.0f}px'.format(height = height*scale),
            'viewBox': '%.1f,%.1f,%.1f,%.1f' % (min_x, min_y, width, height),
            'xmlns': 'http://www.w3.org/2000/svg',
            'xmlns:ev': 'http://www.w3.org/2001/xml-events',
            'xmlns:xlink': 'http://www.w3.org/1999/xlink'
        }

        self.f.write(textwrap.dedent(r'''
            <?xml version="1.0" encoding="utf-8" ?>
            <svg {attrs:s}>
            {data}
            </svg>
        ''').format(
            attrs = ' '.join(['{key:s}="{val:s}"'.format(key = key, val = props[key]) for key in props]),
            data = '\n'.join(self.gen_svg(obj, *style) for obj, style in self.objs)
        ).strip())

def show_dialog(board):
    dialog = MeshPluginMainDialog(board)
    dialog.ShowModal()
    return dialog