summaryrefslogtreecommitdiff
path: root/gerber/am_statements.py
blob: 31c0ae4d20cea8e9cbc7409bd2720ec9c991ab65 (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
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
#!/usr/bin/env python
# -*- coding: utf-8 -*-

# copyright 2015 Hamilton Kibbe <ham@hamiltonkib.be> and Paulo Henrique Silva
# <ph.silva@gmail.com>

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from math import asin
import math

from .primitives import *
from .utils import validate_coordinates, inch, metric, rotate_point



# TODO: Add support for aperture macro variables
__all__ = ['AMPrimitive', 'AMCommentPrimitive', 'AMCirclePrimitive',
           'AMVectorLinePrimitive', 'AMOutlinePrimitive', 'AMPolygonPrimitive',
           'AMMoirePrimitive', 'AMThermalPrimitive', 'AMCenterLinePrimitive',
           'AMLowerLeftLinePrimitive', 'AMUnsupportPrimitive']


class AMPrimitive(object):
    """ Aperture Macro Primitive Base Class

    Parameters
    ----------
    code : int
        primitive shape code

    exposure : str
        on or off Primitives with exposure on create a slid part of
        the macro aperture, and primitives with exposure off erase the
        solid part created previously in the aperture macro definition.
        .. note::
            The erasing effect is limited to the aperture definition in
            which it occurs.

    Returns
    -------
    primitive : :class: `gerber.am_statements.AMPrimitive`

    Raises
    ------
    TypeError, ValueError
    """

    def __init__(self, code, exposure=None):
        VALID_CODES = (0, 1, 2, 4, 5, 6, 7, 20, 21, 22, 9999)
        if not isinstance(code, int):
            raise TypeError('Aperture Macro Primitive code must be an integer')
        elif code not in VALID_CODES:
            raise ValueError('Invalid Code. Valid codes are %s.' %
                             ', '.join(map(str, VALID_CODES)))
        if exposure is not None and exposure.lower() not in ('on', 'off'):
            raise ValueError('Exposure must be either on or off')
        self.code = code
        self.exposure = exposure.lower() if exposure is not None else None

    def to_inch(self):
        raise NotImplementedError('Subclass must implement `to-inch`')

    def to_metric(self):
        raise NotImplementedError('Subclass must implement `to-metric`')

    @property
    def _level_polarity(self):
        if self.exposure == 'off':
            return 'clear'
        return 'dark'

    def to_primitive(self, units):
        """ Return a Primitive instance based on the specified macro params.
        """
        print('Rendering {}s is not supported yet.'.format(str(self.__class__)))

    def __eq__(self, other):
        return self.__dict__ == other.__dict__


class AMCommentPrimitive(AMPrimitive):
    """ Aperture Macro Comment primitive. Code 0

    The comment primitive has no image meaning. It is used to include human-
    readable comments into the AM command.

    .. seealso::
        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
            **Section 4.12.3.1:** Comment, primitive code 0

    Parameters
    ----------
    code : int
        Aperture Macro primitive code. 0 Indicates an AMCommentPrimitive

    comment : str
        The comment as a string.

    Returns
    -------
    CommentPrimitive : :class:`gerber.am_statements.AMCommentPrimitive`
        An Initialized AMCommentPrimitive

    Raises
    ------
    ValueError
    """
    @classmethod
    def from_gerber(cls, primitive):
        primitive = primitive.strip()
        code = int(primitive[0])
        comment = primitive[1:]
        return cls(code, comment)

    def __init__(self, code, comment):
        if code != 0:
            raise ValueError('Not a valid Aperture Macro Comment statement')
        super(AMCommentPrimitive, self).__init__(code)
        self.comment = comment.strip(' *')

    def to_inch(self):
        pass

    def to_metric(self):
        pass

    def to_gerber(self, settings=None):
        return '0 %s *' % self.comment

    def to_primitive(self, units):
        """
        Returns None - has not primitive representation
        """
        return None

    def __str__(self):
        return '<Aperture Macro Comment: %s>' % self.comment


class AMCirclePrimitive(AMPrimitive):
    """ Aperture macro Circle primitive. Code 1

    A circle primitive is defined by its center point and diameter.

    .. seealso::
        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
            **Section 4.12.3.2:** Circle, primitive code 1

    Parameters
    ----------
    code : int
        Circle Primitive code. Must be 1

    exposure : string
        'on' or 'off'

    diameter : float
        Circle diameter

    position : tuple (<float>, <float>)
        Position of the circle relative to the macro origin

    Returns
    -------
    CirclePrimitive : :class:`gerber.am_statements.AMCirclePrimitive`
        An initialized AMCirclePrimitive

    Raises
    ------
    ValueError, TypeError
    """
    @classmethod
    def from_gerber(cls, primitive):
        modifiers = primitive.strip(' *').split(',')
        code = int(modifiers[0])
        exposure = 'on' if float(modifiers[1]) == 1 else 'off'
        diameter = float(modifiers[2])
        position = (float(modifiers[3]), float(modifiers[4]))
        return cls(code, exposure, diameter, position)

    @classmethod
    def from_primitive(cls, primitive):
        return cls(1, 'on', primitive.diameter, primitive.position)

    def __init__(self, code, exposure, diameter, position):
        validate_coordinates(position)
        if code != 1:
            raise ValueError('CirclePrimitive code is 1')
        super(AMCirclePrimitive, self).__init__(code, exposure)
        self.diameter = diameter
        self.position = position

    def to_inch(self):
        self.diameter = inch(self.diameter)
        self.position = tuple([inch(x) for x in self.position])

    def to_metric(self):
        self.diameter = metric(self.diameter)
        self.position = tuple([metric(x) for x in self.position])

    def to_gerber(self, settings=None):
        data = dict(code=self.code,
                    exposure='1' if self.exposure == 'on' else 0,
                    diameter=self.diameter,
                    x=self.position[0],
                    y=self.position[1])
        return '{code},{exposure},{diameter},{x},{y}*'.format(**data)

    def to_primitive(self, units):
        return Circle((self.position), self.diameter, units=units, level_polarity=self._level_polarity)


class AMVectorLinePrimitive(AMPrimitive):
    """ Aperture Macro Vector Line primitive. Code 2 or 20.

    A vector line is a rectangle defined by its line width, start, and end
    points. The line ends are rectangular.

    .. seealso::
        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
            **Section 4.12.3.3:** Vector Line, primitive code 2 or 20.

    Parameters
    ----------
    code : int
        Vector Line Primitive code. Must be either 2 or 20.

    exposure : string
        'on' or 'off'

    width : float
        Line width

    start : tuple (<float>, <float>)
        coordinate of line start point

    end : tuple (<float>, <float>)
        coordinate of line end point

    rotation : float
        Line rotation about the origin.

    Returns
    -------
    LinePrimitive : :class:`gerber.am_statements.AMVectorLinePrimitive`
        An initialized AMVectorLinePrimitive

    Raises
    ------
    ValueError, TypeError
    """

    @classmethod
    def from_primitive(cls, primitive):
        return cls(2, 'on', primitive.aperture.width, primitive.start, primitive.end, 0)

    @classmethod
    def from_gerber(cls, primitive):
        modifiers = primitive.strip(' *').split(',')
        code = int(modifiers[0])
        exposure = 'on' if float(modifiers[1]) == 1 else 'off'
        width = float(modifiers[2])
        start = (float(modifiers[3]), float(modifiers[4]))
        end = (float(modifiers[5]), float(modifiers[6]))
        rotation = float(modifiers[7])
        return cls(code, exposure, width, start, end, rotation)

    def __init__(self, code, exposure, width, start, end, rotation):
        validate_coordinates(start)
        validate_coordinates(end)
        if code not in (2, 20):
            raise ValueError('VectorLinePrimitive codes are 2 or 20')
        super(AMVectorLinePrimitive, self).__init__(code, exposure)
        self.width = width
        self.start = start
        self.end = end
        self.rotation = rotation

    def to_inch(self):
        self.width = inch(self.width)
        self.start = tuple([inch(x) for x in self.start])
        self.end = tuple([inch(x) for x in self.end])

    def to_metric(self):
        self.width = metric(self.width)
        self.start = tuple([metric(x) for x in self.start])
        self.end = tuple([metric(x) for x in self.end])

    def to_gerber(self, settings=None):
        fmtstr = '{code},{exp},{width},{startx},{starty},{endx},{endy},{rotation}*'
        data = dict(code=self.code,
                    exp=1 if self.exposure == 'on' else 0,
                    width=self.width,
                    startx=self.start[0],
                    starty=self.start[1],
                    endx=self.end[0],
                    endy=self.end[1],
                    rotation=self.rotation)
        return fmtstr.format(**data)

    def to_primitive(self, units):
        """
        Convert this to a primitive. We use the Outline to represent this (instead of Line)
        because the behaviour of the end caps is different for aperture macros compared to Lines
        when rotated.
        """

        # Use a line to generate our vertices easily
        line = Line(self.start, self.end, Rectangle(None, self.width, self.width))
        vertices = line.vertices

        aperture = Circle((0, 0), 0)

        lines = []
        prev_point = rotate_point(vertices[-1], self.rotation, (0, 0))
        for point in vertices:
            cur_point = rotate_point(point, self.rotation, (0, 0))

            lines.append(Line(prev_point, cur_point, aperture))

        return Outline(lines, units=units, level_polarity=self._level_polarity)


class AMOutlinePrimitive(AMPrimitive):
    """ Aperture Macro Outline primitive. Code 4.

    An outline primitive is an area enclosed by an n-point polygon defined by
    its start point and n subsequent points. The outline must be closed, i.e.
    the last point must be equal to the start point. Self intersecting
    outlines are not allowed.

    .. seealso::
        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
            **Section 4.12.3.6:** Outline, primitive code 4.

     Parameters
    ----------
    code : int
        OutlinePrimitive code. Must be 6.

    exposure : string
        'on' or 'off'

    start_point : tuple (<float>, <float>)
        coordinate of outline start point

    points : list of tuples (<float>, <float>)
        coordinates of subsequent points

    rotation : float
        outline rotation about the origin.

    Returns
    -------
    OutlinePrimitive : :class:`gerber.am_statements.AMOutlineinePrimitive`
        An initialized AMOutlinePrimitive

    Raises
    ------
    ValueError, TypeError
    """

    @classmethod
    def from_primitive(cls, primitive):

        start_point = (round(primitive.primitives[0].start[0], 6), round(primitive.primitives[0].start[1], 6))
        points = []
        for prim in primitive.primitives:
            points.append((round(prim.end[0], 6), round(prim.end[1], 6)))

        rotation = 0.0

        return cls(4, 'on', start_point, points, rotation)

    @classmethod
    def from_gerber(cls, primitive):
        modifiers = primitive.strip(' *').split(",")

        code = int(modifiers[0])
        exposure = "on" if float(modifiers[1]) == 1 else "off"
        n = int(float(modifiers[2]))
        start_point = (float(modifiers[3]), float(modifiers[4]))
        points = []
        for i in range(n):
            points.append((float(modifiers[5 + i * 2]),
                           float(modifiers[5 + i * 2 + 1])))
        rotation = float(modifiers[-1])
        return cls(code, exposure, start_point, points, rotation)

    def __init__(self, code, exposure, start_point, points, rotation):
        """ Initialize AMOutlinePrimitive
        """
        validate_coordinates(start_point)
        for point in points:
            validate_coordinates(point)
        if code != 4:
            raise ValueError('OutlinePrimitive code is 4')
        super(AMOutlinePrimitive, self).__init__(code, exposure)
        self.start_point = start_point
        if points[-1] != start_point:
            raise ValueError('OutlinePrimitive must be closed')
        self.points = points
        self.rotation = rotation

    def to_inch(self):
        self.start_point = tuple([inch(x) for x in self.start_point])
        self.points = tuple([(inch(x), inch(y)) for x, y in self.points])

    def to_metric(self):
        self.start_point = tuple([metric(x) for x in self.start_point])
        self.points = tuple([(metric(x), metric(y)) for x, y in self.points])

    def to_gerber(self, settings=None):
        data = dict(
            code=self.code,
            exposure="1" if self.exposure == "on" else "0",
            n_points=len(self.points),
            start_point="%.6g,%.6g" % self.start_point,
            points=",\n".join(["%.6g,%.6g" % point for point in self.points]),
            rotation=str(self.rotation)
        )
        return "{code},{exposure},{n_points},{start_point},{points},{rotation}*".format(**data)

    def to_primitive(self, units):
        """
        Convert this to a drawable primitive. This uses the Outline instead of Line
        primitive to handle differences in end caps when rotated.
        """

        lines = []
        prev_point = rotate_point(self.start_point, self.rotation)
        for point in self.points:
            cur_point = rotate_point(point, self.rotation)

            lines.append(Line(prev_point, cur_point, Circle((0,0), 0)))

            prev_point = cur_point

        if lines[0].start != lines[-1].end:
            raise ValueError('Outline must be closed')

        return Outline(lines, units=units, level_polarity=self._level_polarity)


class AMPolygonPrimitive(AMPrimitive):
    """ Aperture Macro Polygon primitive. Code 5.

    A polygon primitive is a regular polygon defined by the number of
    vertices, the center point, and the diameter of the circumscribed circle.

    .. seealso::
        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
            **Section 4.12.3.8:** Polygon, primitive code 5.

    Parameters
    ----------
    code : int
        PolygonPrimitive code. Must be 5.

    exposure : string
        'on' or 'off'

    vertices : int, 3 <= vertices <= 12
        Number of vertices

    position : tuple (<float>, <float>)
        X and Y coordinates of polygon center

    diameter : float
        diameter of circumscribed circle.

    rotation : float
        polygon rotation about the origin.

    Returns
    -------
    PolygonPrimitive : :class:`gerber.am_statements.AMPolygonPrimitive`
        An initialized AMPolygonPrimitive

    Raises
    ------
    ValueError, TypeError
    """

    @classmethod
    def from_primitive(cls, primitive):
        return cls(5, 'on', primitive.sides, primitive.position, primitive.diameter, primitive.rotation)

    @classmethod
    def from_gerber(cls, primitive):
        modifiers = primitive.strip(' *').split(",")
        code = int(modifiers[0])
        exposure = "on" if float(modifiers[1]) == 1 else "off"
        vertices = int(float(modifiers[2]))
        position = (float(modifiers[3]), float(modifiers[4]))
        try:
            diameter = float(modifiers[5])
        except:
            diameter = 0

        rotation = float(modifiers[6])
        return cls(code, exposure, vertices, position, diameter, rotation)

    def __init__(self, code, exposure, vertices, position, diameter, rotation):
        """ Initialize AMPolygonPrimitive
        """
        if code != 5:
            raise ValueError('PolygonPrimitive code is 5')
        super(AMPolygonPrimitive, self).__init__(code, exposure)
        if vertices < 3 or vertices > 12:
            raise ValueError('Number of vertices must be between 3 and 12')
        self.vertices = vertices
        validate_coordinates(position)
        self.position = position
        self.diameter = diameter
        self.rotation = rotation

    def to_inch(self):
        self.position = tuple([inch(x) for x in self.position])
        self.diameter = inch(self.diameter)

    def to_metric(self):
        self.position = tuple([metric(x) for x in self.position])
        self.diameter = metric(self.diameter)

    def to_gerber(self, settings=None):
        data = dict(
            code=self.code,
            exposure="1" if self.exposure == "on" else "0",
            vertices=self.vertices,
            position="%.4g,%.4g" % self.position,
            diameter='%.4g' % self.diameter,
            rotation=str(self.rotation)
        )
        fmt = "{code},{exposure},{vertices},{position},{diameter},{rotation}*"
        return fmt.format(**data)

    def to_primitive(self, units):
        return Polygon(self.position, self.vertices, self.diameter / 2.0, 0, rotation=math.radians(self.rotation), units=units, level_polarity=self._level_polarity)


class AMMoirePrimitive(AMPrimitive):
    """ Aperture Macro Moire primitive. Code 6.

    The moire primitive is a cross hair centered on concentric rings (annuli).
    Exposure is always on.

    .. seealso::
        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
            **Section 4.12.3.9:** Moire, primitive code 6.

    Parameters
    ----------
    code : int
        Moire Primitive code. Must be 6.

    position : tuple (<float>, <float>)
        X and Y coordinates of moire center

    diameter : float
        outer diameter of outer ring.

    ring_thickness : float
        thickness of concentric rings.

    gap : float
        gap between concentric rings.

    max_rings : float
        maximum number of rings

    crosshair_thickness : float
        thickness of crosshairs

    crosshair_length : float
        length of crosshairs

    rotation : float
        moire rotation about the origin.

    Returns
    -------
    MoirePrimitive : :class:`gerber.am_statements.AMMoirePrimitive`
        An initialized AMMoirePrimitive

    Raises
    ------
    ValueError, TypeError
    """
    @classmethod
    def from_gerber(cls, primitive):
        modifiers = primitive.strip(' *').split(",")
        code = int(modifiers[0])
        position = (float(modifiers[1]), float(modifiers[2]))
        diameter = float(modifiers[3])
        ring_thickness = float(modifiers[4])
        gap = float(modifiers[5])
        max_rings = int(float(modifiers[6]))
        crosshair_thickness = float(modifiers[7])
        crosshair_length = float(modifiers[8])
        rotation = float(modifiers[9])
        return cls(code, position, diameter, ring_thickness, gap, max_rings, crosshair_thickness, crosshair_length, rotation)

    def __init__(self, code, position, diameter, ring_thickness, gap, max_rings, crosshair_thickness, crosshair_length, rotation):
        """ Initialize AMoirePrimitive
        """
        if code != 6:
            raise ValueError('MoirePrimitive code is 6')
        super(AMMoirePrimitive, self).__init__(code, 'on')
        validate_coordinates(position)
        self.position = position
        self.diameter = diameter
        self.ring_thickness = ring_thickness
        self.gap = gap
        self.max_rings = max_rings
        self.crosshair_thickness = crosshair_thickness
        self.crosshair_length = crosshair_length
        self.rotation = rotation

    def to_inch(self):
        self.position = tuple([inch(x) for x in self.position])
        self.diameter = inch(self.diameter)
        self.ring_thickness = inch(self.ring_thickness)
        self.gap = inch(self.gap)
        self.crosshair_thickness = inch(self.crosshair_thickness)
        self.crosshair_length = inch(self.crosshair_length)

    def to_metric(self):
        self.position = tuple([metric(x) for x in self.position])
        self.diameter = metric(self.diameter)
        self.ring_thickness = metric(self.ring_thickness)
        self.gap = metric(self.gap)
        self.crosshair_thickness = metric(self.crosshair_thickness)
        self.crosshair_length = metric(self.crosshair_length)


    def to_gerber(self, settings=None):
        data = dict(
            code=self.code,
            position="%.4g,%.4g" % self.position,
            diameter=self.diameter,
            ring_thickness=self.ring_thickness,
            gap=self.gap,
            max_rings=self.max_rings,
            crosshair_thickness=self.crosshair_thickness,
            crosshair_length=self.crosshair_length,
            rotation=self.rotation
        )
        fmt = "{code},{position},{diameter},{ring_thickness},{gap},{max_rings},{crosshair_thickness},{crosshair_length},{rotation}*"
        return fmt.format(**data)

    def to_primitive(self, units):
        #raise NotImplementedError()
        return None


class AMThermalPrimitive(AMPrimitive):
    """ Aperture Macro Thermal primitive. Code 7.

    The thermal primitive is a ring (annulus) interrupted by four gaps.
    Exposure is always on.

    .. seealso::
        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
            **Section 4.12.3.10:** Thermal, primitive code 7.

    Parameters
    ----------
    code : int
        Thermal Primitive code. Must be 7.

    position : tuple (<float>, <float>)
        X and Y coordinates of thermal center

    outer_diameter : float
        outer diameter of thermal.

    inner_diameter : float
        inner diameter of thermal.

    gap : float
        gap thickness

    rotation : float
        thermal rotation about the origin.

    Returns
    -------
    ThermalPrimitive : :class:`gerber.am_statements.AMThermalPrimitive`
        An initialized AMThermalPrimitive

    Raises
    ------
    ValueError, TypeError
    """
    @classmethod
    def from_gerber(cls, primitive):
        modifiers = primitive.strip(' *').split(",")
        code = int(modifiers[0])
        position = (float(modifiers[1]), float(modifiers[2]))
        outer_diameter = float(modifiers[3])
        inner_diameter = float(modifiers[4])
        gap = float(modifiers[5])
        rotation = float(modifiers[6])
        return cls(code, position, outer_diameter, inner_diameter, gap, rotation)

    def __init__(self, code, position, outer_diameter, inner_diameter, gap, rotation):
        if code != 7:
            raise ValueError('ThermalPrimitive code is 7')
        super(AMThermalPrimitive, self).__init__(code, 'on')
        validate_coordinates(position)
        self.position = position
        self.outer_diameter = outer_diameter
        self.inner_diameter = inner_diameter
        self.gap = gap
        self.rotation = rotation

    def to_inch(self):
        self.position = tuple([inch(x) for x in self.position])
        self.outer_diameter = inch(self.outer_diameter)
        self.inner_diameter = inch(self.inner_diameter)
        self.gap = inch(self.gap)

    def to_metric(self):
        self.position = tuple([metric(x) for x in self.position])
        self.outer_diameter = metric(self.outer_diameter)
        self.inner_diameter = metric(self.inner_diameter)
        self.gap = metric(self.gap)

    def to_gerber(self, settings=None):
        data = dict(
            code=self.code,
            position="%.4g,%.4g" % self.position,
            outer_diameter=self.outer_diameter,
            inner_diameter=self.inner_diameter,
            gap=self.gap,
            rotation=self.rotation
        )
        fmt = "{code},{position},{outer_diameter},{inner_diameter},{gap},{rotation}*"
        return fmt.format(**data)

    def _approximate_arc_cw(self, start_angle, end_angle, radius, center):
        """
        Get an arc as a series of points

        Parameters
        ----------
        start_angle : The start angle in radians
        end_angle : The end angle in radians
        radius`: Radius of the arc
        center : The center point of the arc (x, y) tuple

        Returns
        -------
        array of point tuples
        """

        # The total sweep
        sweep_angle = end_angle - start_angle
        num_steps = 10

        angle_step = sweep_angle / num_steps

        radius = radius
        center = center

        points = []

        for i in range(num_steps + 1):
            current_angle = start_angle + (angle_step * i)

            nextx = (center[0] + math.cos(current_angle) * radius)
            nexty = (center[1] + math.sin(current_angle) * radius)

            points.append((nextx, nexty))

        return points

    def to_primitive(self, units):

        # We start with calculating the top right section, then duplicate it

        inner_radius = self.inner_diameter / 2.0
        outer_radius = self.outer_diameter / 2.0

        # Calculate the start angle relative to the horizontal axis
        inner_offset_angle = asin(self.gap / 2.0 / inner_radius)
        outer_offset_angle = asin(self.gap / 2.0 / outer_radius)

        rotation_rad = math.radians(self.rotation)
        inner_start_angle = inner_offset_angle + rotation_rad
        inner_end_angle =  math.pi / 2 - inner_offset_angle + rotation_rad

        outer_start_angle = outer_offset_angle + rotation_rad
        outer_end_angle = math.pi / 2 - outer_offset_angle + rotation_rad

        outlines = []
        aperture = Circle((0, 0), 0)

        points = (self._approximate_arc_cw(inner_start_angle, inner_end_angle, inner_radius, self.position)
                + list(reversed(self._approximate_arc_cw(outer_start_angle, outer_end_angle, outer_radius, self.position))))
        # Add in the last point since outlines should be closed
        points.append(points[0])

        # There are four outlines at rotated sections
        for rotation in [0, 90.0, 180.0, 270.0]:

            lines = []
            prev_point = rotate_point(points[0], rotation, self.position)
            for point in points[1:]:
                cur_point = rotate_point(point, rotation, self.position)

                lines.append(Line(prev_point, cur_point, aperture))

            prev_point = cur_point

            outlines.append(Outline(lines, units=units, level_polarity=self._level_polarity))

        return outlines


class AMCenterLinePrimitive(AMPrimitive):
    """ Aperture Macro Center Line primitive. Code 21.

    The center line primitive is a rectangle defined by its width, height, and center point.

    .. seealso::
        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
            **Section 4.12.3.4:** Center Line, primitive code 21.

    Parameters
    ----------
    code : int
        Center Line Primitive code. Must be 21.

    exposure : str
        'on' or 'off'

    width : float
        Width of rectangle

    height : float
        Height of rectangle

    center : tuple (<float>, <float>)
        X and Y coordinates of line center

    rotation : float
        rectangle rotation about its center.

    Returns
    -------
    CenterLinePrimitive : :class:`gerber.am_statements.AMCenterLinePrimitive`
        An initialized AMCenterLinePrimitive

    Raises
    ------
    ValueError, TypeError
    """

    @classmethod
    def from_primitive(cls, primitive):
        width = primitive.width
        height = primitive.height
        center = primitive.position
        rotation = math.degrees(primitive.rotation)
        return cls(21, 'on', width, height, center, rotation)

    @classmethod
    def from_gerber(cls, primitive):
        modifiers = primitive.strip(' *').split(",")
        code = int(modifiers[0])
        exposure = 'on' if float(modifiers[1]) == 1 else 'off'
        width = float(modifiers[2])
        height = float(modifiers[3])
        center = (float(modifiers[4]), float(modifiers[5]))
        rotation = float(modifiers[6])
        return cls(code, exposure, width, height, center, rotation)

    def __init__(self, code, exposure, width, height, center, rotation):
        if code != 21:
            raise ValueError('CenterLinePrimitive code is 21')
        super(AMCenterLinePrimitive, self).__init__(code, exposure)
        self.width = width
        self.height = height
        validate_coordinates(center)
        self.center = center
        self.rotation = rotation

    def to_inch(self):
        self.center = tuple([inch(x) for x in self.center])
        self.width = inch(self.width)
        self.height = inch(self.height)

    def to_metric(self):
        self.center = tuple([metric(x) for x in self.center])
        self.width = metric(self.width)
        self.height = metric(self.height)

    def to_gerber(self, settings=None):
        data = dict(
            code=self.code,
            exposure = '1' if self.exposure == 'on' else '0',
            width = self.width,
            height = self.height,
            center="%.4g,%.4g" % self.center,
            rotation=self.rotation
        )
        fmt = "{code},{exposure},{width},{height},{center},{rotation}*"
        return fmt.format(**data)

    def to_primitive(self, units):

        x = self.center[0]
        y = self.center[1]
        half_width = self.width / 2.0
        half_height = self.height / 2.0

        points = []
        points.append((x - half_width, y + half_height))
        points.append((x - half_width, y - half_height))
        points.append((x + half_width, y - half_height))
        points.append((x + half_width, y + half_height))

        aperture = Circle((0, 0), 0)

        lines = []
        prev_point = rotate_point(points[3], self.rotation, self.center)
        for point in points:
            cur_point = rotate_point(point, self.rotation, self.center)

            lines.append(Line(prev_point, cur_point, aperture))

        return Outline(lines, units=units, level_polarity=self._level_polarity)


class AMLowerLeftLinePrimitive(AMPrimitive):
    """ Aperture Macro Lower Left Line primitive. Code 22.

    The lower left line primitive is a rectangle defined by its width, height, and the lower left point.

    .. seealso::
        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
            **Section 4.12.3.5:** Lower Left Line, primitive code 22.

    Parameters
    ----------
    code : int
        Center Line Primitive code. Must be 22.

    exposure : str
        'on' or 'off'

    width : float
        Width of rectangle

    height : float
        Height of rectangle

    lower_left : tuple (<float>, <float>)
        X and Y coordinates of lower left corner

    rotation : float
        rectangle rotation about its origin.

    Returns
    -------
    LowerLeftLinePrimitive : :class:`gerber.am_statements.AMLowerLeftLinePrimitive`
        An initialized AMLowerLeftLinePrimitive

    Raises
    ------
    ValueError, TypeError
    """
    @classmethod
    def from_gerber(cls, primitive):
        modifiers = primitive.strip(' *').split(",")
        code = int(modifiers[0])
        exposure = 'on' if float(modifiers[1]) == 1 else 'off'
        width = float(modifiers[2])
        height = float(modifiers[3])
        lower_left = (float(modifiers[4]), float(modifiers[5]))
        rotation = float(modifiers[6])
        return cls(code, exposure, width, height, lower_left, rotation)

    def __init__(self, code, exposure, width, height, lower_left, rotation):
        if code != 22:
            raise ValueError('LowerLeftLinePrimitive code is 22')
        super (AMLowerLeftLinePrimitive, self).__init__(code, exposure)
        self.width = width
        self.height = height
        validate_coordinates(lower_left)
        self.lower_left = lower_left
        self.rotation = rotation

    def to_inch(self):
        self.lower_left = tuple([inch(x) for x in self.lower_left])
        self.width = inch(self.width)
        self.height = inch(self.height)

    def to_metric(self):
        self.lower_left = tuple([metric(x) for x in self.lower_left])
        self.width = metric(self.width)
        self.height = metric(self.height)

    def to_gerber(self, settings=None):
        data = dict(
            code=self.code,
            exposure = '1' if self.exposure == 'on' else '0',
            width = self.width,
            height = self.height,
            lower_left="%.4g,%.4g" % self.lower_left,
            rotation=self.rotation
        )
        fmt = "{code},{exposure},{width},{height},{lower_left},{rotation}*"
        return fmt.format(**data)


class AMUnsupportPrimitive(AMPrimitive):
    @classmethod
    def from_gerber(cls, primitive):
        return cls(primitive)

    def __init__(self, primitive):
        super(AMUnsupportPrimitive, self).__init__(9999)
        self.primitive = primitive

    def to_inch(self):
        pass

    def to_metric(self):
        pass

    def to_gerber(self, settings=None):
        return self.primitive