-
Notifications
You must be signed in to change notification settings - Fork 191
/
glcartoon.js
1410 lines (1198 loc) · 57.3 KB
/
glcartoon.js
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
//glcartoon.js
//This contains all the routines for rendering a cartoon given a set
//of atoms with assigned secondary structure
//TODO: generate normals directly in drawStrip and drawThinStrip
var $3Dmol = $3Dmol || {};
/**
* @typedef CartoonStyleSpec
* @prop {ColorSpec} color - strand color, may specify as 'spectrum' which will apply reversed gradient based on residue number
* @prop {string} style - style of cartoon rendering (trace, oval, rectangle
* (default), parabola, edged)
* @prop {boolean} ribbon - whether to use constant strand width, disregarding
* secondary structure; use thickness to adjust radius
* @prop {boolean} arrows - whether to add arrows showing beta-sheet
* directionality; does not apply to trace or ribbon
* @prop {boolean} tubes - whether to display alpha helices as simple cylinders;
* does not apply to trace
* @prop {number} thickness - cartoon strand thickness, default is 0.4
* @prop {number} width - cartoon strand width, default is secondary
* structure-dependent; does not apply to trace or ribbon
* @prop {number} opacity - set opacity from 0-1; transparency is set per-chain
* with a warning outputted in the event of ambiguity
* @prop {} In nucleic acids, the base cylinders obtain their color from the
* atom to which the cylinder is drawn, which is 'N1' for purines (resn:
* 'A', 'G', 'DA', 'DG') and 'N3' for pyrimidines (resn: 'C', 'U', 'DC',
* 'DT'). The different nucleobases can therefore be distinguished as
* follows:
* @example $3Dmol.download("pdb:4ZD3",viewer,{},function(){
viewer.setBackgroundColor(0xffffffff);
viewer.setViewStyle({style:"outline"});
viewer.setStyle({},{cartoon:{}});
viewer.render();
});
*/
// helper functions
// Catmull-Rom subdivision
$3Dmol.subdivide_spline = function(_points, DIV) { // points as Vector3
var ret = [];
var points = _points;
points = []; // Smoothing test
points.push(_points[0]);
var i, lim, size;
var p0, p1, p2, p3, v0, v1;
for (i = 1, lim = _points.length - 1; i < lim; i++) {
p1 = _points[i];
p2 = _points[i + 1];
if (p1.smoothen) {
var np = new $3Dmol.Vector3((p1.x + p2.x) / 2,
(p1.y + p2.y) / 2, (p1.z + p2.z) / 2);
np.atom = p1.atom;
points.push(np);
}
else
points.push(p1);
}
points.push(_points[_points.length - 1]);
for (i = -1, size = points.length; i <= size - 3; i++) {
p0 = points[(i === -1) ? 0 : i];
p1 = points[i + 1];
p2 = points[i + 2];
p3 = points[(i === size - 3) ? size - 1 : i + 3];
v0 = new $3Dmol.Vector3().subVectors(p2, p0).multiplyScalar(0.5);
v1 = new $3Dmol.Vector3().subVectors(p3, p1).multiplyScalar(0.5);
if (p2.skip)
continue;
for (var j = 0; j < DIV; j++) {
var t = 1.0 / DIV * j;
var x = p1.x + t * v0.x + t * t
* (-3 * p1.x + 3 * p2.x - 2 * v0.x - v1.x) + t * t * t
* (2 * p1.x - 2 * p2.x + v0.x + v1.x);
var y = p1.y + t * v0.y + t * t
* (-3 * p1.y + 3 * p2.y - 2 * v0.y - v1.y) + t * t * t
* (2 * p1.y - 2 * p2.y + v0.y + v1.y);
var z = p1.z + t * v0.z + t * t
* (-3 * p1.z + 3 * p2.z - 2 * v0.z - v1.z) + t * t * t
* (2 * p1.z - 2 * p2.z + v0.z + v1.z);
var pt = new $3Dmol.Vector3(x, y, z);
if(j < DIV/2) {
pt.atom = p1.atom;
} else {
pt.atom = p2.atom;
}
ret.push(pt);
}
}
ret.push(points[points.length - 1]);
return ret;
};
/**
* @ignore
* @param {$3Dmol.Object3D}
* group
* @param {AtomSpec}
* atomlist
*/
$3Dmol.drawCartoon = (function() {
var defaultNum = 5; // for cross-sectional shape
var defaultDiv = 5; // for length-wise splicing
var coilWidth = 0.5;
var helixSheetWidth = 1.3;
var nucleicAcidWidth = 0.8;
var arrowTipWidth = 0.1;
var defaultThickness = 0.4;
var drawThinStrip = function(geo, p1, p2, colors, div, opacity) {
var offset, vertoffset;
var color, colori;
for (var i = 0, lim = p1.length; i < lim; i++) {
colori = Math.round(i * (colors.length - 1) / lim);
color = $3Dmol.CC.color(colors[colori]);
geoGroup = geo.updateGeoGroup(2);
var vertexArray = geoGroup.vertexArray;
var colorArray = geoGroup.colorArray;
var faceArray = geoGroup.faceArray;
offset = geoGroup.vertices;
vertoffset = offset * 3;
vertexArray[vertoffset] = p1[i].x;
vertexArray[vertoffset + 1] = p1[i].y;
vertexArray[vertoffset + 2] = p1[i].z;
vertexArray[vertoffset + 3] = p2[i].x;
vertexArray[vertoffset + 4] = p2[i].y;
vertexArray[vertoffset + 5] = p2[i].z;
for (var j = 0; j < 6; ++j) {
colorArray[vertoffset + 3 * j] = color.r;
colorArray[vertoffset + 1 + 3 * j] = color.g;
colorArray[vertoffset + 2 + 3 * j] = color.b;
}
if (i > 0) {
var faces = [ offset, offset + 1, offset - 1, offset - 2 ];
var faceoffset = geoGroup.faceidx;
faceArray[faceoffset] = faces[0];
faceArray[faceoffset + 1] = faces[1];
faceArray[faceoffset + 2] = faces[3];
faceArray[faceoffset + 3] = faces[1];
faceArray[faceoffset + 4] = faces[2];
faceArray[faceoffset + 5] = faces[3];
geoGroup.faceidx += 6;
}
geoGroup.vertices += 2;
}
};
var drawShapeStrip = function(geo, points, colors, div, thickness, opacity,
shape) {
// points is a 2D array, dimensionality given by [num = cross-sectional
// resolution][len = length of strip]
var i, j, num, len;
num = points.length;
if (num < 2 || points[0].length < 2)
return;
div = div || axisDIV;
for (i = 0; i < num; i++) { // spline to generate greater length-wise
// resolution
points[i] = $3Dmol.subdivide_spline(points[i], div)
}
len = points[0].length;
if (!thickness) // if thickness is 0, we can use a smaller geometry than
// this function generates
return drawThinStrip(geo, points[0], points[num - 1], colors, div,
opacity);
var axis, cs_shape, cs_bottom, cs_top, last_cs_bottom, last_cs_top;
// cache the available cross-sectional shapes
var cs_ellipse = [], cs_rectangle = [], cs_parabola = [];
for (j = 0; j < num; j++) {
cs_ellipse.push(0.25 + 1.5
* Math.sqrt((num - 1) * j - Math.pow(j, 2)) / (num - 1));
cs_rectangle.push(0.5);
cs_parabola.push(2 * (Math.pow(j / num, 2) - j / num) + 0.6);
}
/*
* face_refs array is used to generate faces from vertexArray
* iteratively. As we move through each cross-sectional segment of
* points, we draw lateral faces backwards to the previous
* cross-sectional segment.
*
* To correctly identify the points needed to make each face we use this
* array as a lookup table for the relative indices of each needed point
* in the vertices array.
*
* 4 points are used to create 2 faces.
*/
var face_refs = [];
for (j = 0; j < num * 2 - 1; j++) {
/*
* [curr vertex in curr cross-section, next vertex in curr
* cross-section, next vertex in prev cross-section, curr vertex in
* prev cross-section]
*/
face_refs[j] = [ j, j + 1, j + 1 - 2 * num, j - 2 * num ];
}
// last face is different. easier to conceptualize this by drawing a
// diagram
face_refs[num * 2 - 1] = [ j, j + 1 - 2 * num, j + 1 - 4 * num,
j - 2 * num ];
var v_offset, va_offset, f_offset;
var currentAtom, lastAtom
var color, colori;
var geoGroup = geo.updateGeoGroup(2 * num * len); // ensure vertex
// capacity
for (i = 0; i < len; i++) {
colori = Math.round(i * (colors.length - 1) / len);
color = $3Dmol.CC.color(colors[colori]);
last_cs_bottom = cs_bottom;
last_cs_top = cs_top;
cs_bottom = [];
cs_top = [];
axis = [];
if (points[0][i].atom !== undefined) // TODO better edge case
// handling
{
currentAtom = points[0][i].atom;
if (shape === "oval")
cs_shape = cs_ellipse;
else if (shape === "rectangle")
cs_shape = cs_rectangle;
else if (shape === "parabola")
cs_shape = cs_parabola;
}
if (!cs_shape)
cs_shape = cs_rectangle;
// calculate thickness at each width point, from cross-sectional
// shape
var toNext, toSide;
for (j = 0; j < num; j++) {
if (i < len - 1)
toNext = points[j][i + 1].clone().sub(points[j][i]);
else
toNext = points[j][i - 1].clone().sub(points[j][i])
.negate();
if (j < num - 1)
toSide = points[j + 1][i].clone().sub(points[j][i]);
else
toSide = points[j - 1][i].clone().sub(points[j][i])
.negate();
axis[j] = toSide.cross(toNext).normalize().multiplyScalar(
thickness * cs_shape[j]);
}
// generate vertices by applying cross-sectional shape thickness to
// input points
for (j = 0; j < num; j++)
cs_bottom[j] = points[j][i].clone().add(
axis[j].clone().negate());
for (j = 0; j < num; j++)
cs_top[j] = points[j][i].clone().add(axis[j]);
/*
* Until this point the vertices have been dealt with as
* $3Dmol.Vector3() objects, but we need to serialize them into the
* geoGroup.vertexArray, where every three indices represents the
* next vertex. The colorArray is analogous.
*
* In the following for-loops, j iterates through VERTICES so we
* need to index them in vertexArray by 3*j + either 0, 1, or 2 for
* xyz or rgb component.
*/
var vertexArray = geoGroup.vertexArray;
var colorArray = geoGroup.colorArray;
var faceArray = geoGroup.faceArray;
v_offset = geoGroup.vertices;
va_offset = v_offset * 3; // in case geoGroup already contains
// vertices
// bottom edge of cross-section, vertices [0, num)
for (j = 0; j < num; j++) {
vertexArray[va_offset + 3 * j + 0] = cs_bottom[j].x;
vertexArray[va_offset + 3 * j + 1] = cs_bottom[j].y;
vertexArray[va_offset + 3 * j + 2] = cs_bottom[j].z;
}
// top edge of cross-section, vertices [num, 2*num)
// add these backwards, so that each cross-section's vertices are
// added sequentially to vertexArray
for (j = 0; j < num; j++) {
vertexArray[va_offset + 3 * j + 0 + 3 * num] = cs_top[num - 1
- j].x;
vertexArray[va_offset + 3 * j + 1 + 3 * num] = cs_top[num - 1
- j].y;
vertexArray[va_offset + 3 * j + 2 + 3 * num] = cs_top[num - 1
- j].z;
}
for (j = 0; j < 2 * num; ++j) {
colorArray[va_offset + 3 * j + 0] = color.r;
colorArray[va_offset + 3 * j + 1] = color.g;
colorArray[va_offset + 3 * j + 2] = color.b;
}
if (i > 0) {
for (j = 0; j < num * 2; j++) {
// get VERTEX indices of the 4 points of a rectangular face
// (as opposed to literal vertexArray indices)
var face = [ v_offset + face_refs[j][0],
v_offset + face_refs[j][1],
v_offset + face_refs[j][2],
v_offset + face_refs[j][3] ];
f_offset = geoGroup.faceidx;
// need 2 triangles to draw a face between 4 points
faceArray[f_offset] = face[0];
faceArray[f_offset + 1] = face[1];
faceArray[f_offset + 2] = face[3];
faceArray[f_offset + 3] = face[1];
faceArray[f_offset + 4] = face[2];
faceArray[f_offset + 5] = face[3];
geoGroup.faceidx += 6;
// TODO implement clickable the right way. midpoints of
// strand between consecutive atoms
}
if (currentAtom.clickable || currentAtom.hoverable) {
var faces = [];
faces.push(new $3Dmol.Triangle(last_cs_bottom[0],
cs_bottom[0], cs_bottom[num - 1]));
faces.push(new $3Dmol.Triangle(last_cs_bottom[0],
cs_bottom[num - 1], last_cs_bottom[num - 1]));
faces.push(new $3Dmol.Triangle(last_cs_bottom[num - 1],
cs_bottom[num - 1], cs_top[num - 1]));
faces.push(new $3Dmol.Triangle(last_cs_bottom[num - 1],
cs_top[num - 1], last_cs_top[num - 1]));
faces.push(new $3Dmol.Triangle(cs_top[0], last_cs_top[0],
last_cs_top[num - 1]));
faces.push(new $3Dmol.Triangle(cs_top[num - 1], cs_top[0],
last_cs_top[num - 1]));
faces.push(new $3Dmol.Triangle(cs_bottom[0],
last_cs_bottom[0], last_cs_top[0]));
faces.push(new $3Dmol.Triangle(cs_top[0], cs_bottom[0],
last_cs_top[0]));
for (j in faces) {
currentAtom.intersectionShape.triangle.push(faces[j]);
}
}
}
geoGroup.vertices += 2 * num;
lastAtom = currentAtom;
}
// for terminal faces
var vertexArray = geoGroup.vertexArray;
var colorArray = geoGroup.colorArray;
var faceArray = geoGroup.faceArray;
v_offset = geoGroup.vertices;
va_offset = v_offset * 3;
f_offset = geoGroup.faceidx;
for (i = 0; i < num - 1; i++) // "rear" face
{
var face = [ i, i + 1, 2 * num - 2 - i, 2 * num - 1 - i ];
f_offset = geoGroup.faceidx;
faceArray[f_offset] = face[0];
faceArray[f_offset + 1] = face[1];
faceArray[f_offset + 2] = face[3];
faceArray[f_offset + 3] = face[1];
faceArray[f_offset + 4] = face[2];
faceArray[f_offset + 5] = face[3];
geoGroup.faceidx += 6;
}
for (i = 0; i < num - 1; i++) // "front" face
{
var face = [ v_offset - 1 - i, v_offset - 2 - i,
v_offset - 2 * num + i + 1, v_offset - 2 * num + i ];
f_offset = geoGroup.faceidx;
faceArray[f_offset] = face[0];
faceArray[f_offset + 1] = face[1];
faceArray[f_offset + 2] = face[3];
faceArray[f_offset + 3] = face[1];
faceArray[f_offset + 4] = face[2];
faceArray[f_offset + 5] = face[3];
geoGroup.faceidx += 6;
}
};
var drawPlainStrip = function(geo, points, colors, div, thickness, opacity) {
if ((points.length) < 2)
return;
var p1, p2;
p1 = points[0];
p2 = points[points.length - 1];
div = div || axisDIV;
p1 = $3Dmol.subdivide_spline(p1, div);
p2 = $3Dmol.subdivide_spline(p2, div);
if (!thickness)
return drawThinStrip(geo, p1, p2, colors, div, opacity);
// var vs = geo.vertices, fs = geo.faces;
var vs = [], fs = [];
var axis, p1v, p2v, a1v, a2v;
var faces = [ [ 0, 2, -6, -8 ], [ -4, -2, 6, 4 ], [ 7, -1, -5, 3 ],
[ -3, 5, 1, -7 ] ];
var offset, vertoffset, faceoffset;
var color, colori;
var currentAtom, lastAtom;
var i, lim, j;
var face1, face2, face3;
var geoGroup;
for (i = 0, lim = p1.length; i < lim; i++) {
colori = Math.round(i * (colors.length - 1) / lim);
color = $3Dmol.CC.color(colors[colori]);
vs.push(p1v = p1[i]); // 0
vs.push(p1v); // 1
vs.push(p2v = p2[i]); // 2
vs.push(p2v); // 3
if (i < lim - 1) {
var toNext = p1[i + 1].clone().sub(p1[i]);
var toSide = p2[i].clone().sub(p1[i]);
axis = toSide.cross(toNext).normalize().multiplyScalar(
thickness);
}
vs.push(a1v = p1[i].clone().add(axis)); // 4
vs.push(a1v); // 5
vs.push(a2v = p2[i].clone().add(axis)); // 6
vs.push(a2v); // 7
if (p1v.atom !== undefined)
currentAtom = p1v.atom;
geoGroup = geo.updateGeoGroup(8);
var vertexArray = geoGroup.vertexArray;
var colorArray = geoGroup.colorArray;
var faceArray = geoGroup.faceArray;
offset = geoGroup.vertices;
vertoffset = offset * 3;
vertexArray[vertoffset] = p1v.x;
vertexArray[vertoffset + 1] = p1v.y;
vertexArray[vertoffset + 2] = p1v.z;
vertexArray[vertoffset + 3] = p1v.x;
vertexArray[vertoffset + 4] = p1v.y;
vertexArray[vertoffset + 5] = p1v.z;
vertexArray[vertoffset + 6] = p2v.x;
vertexArray[vertoffset + 7] = p2v.y;
vertexArray[vertoffset + 8] = p2v.z;
vertexArray[vertoffset + 9] = p2v.x;
vertexArray[vertoffset + 10] = p2v.y;
vertexArray[vertoffset + 11] = p2v.z;
vertexArray[vertoffset + 12] = a1v.x;
vertexArray[vertoffset + 13] = a1v.y;
vertexArray[vertoffset + 14] = a1v.z;
vertexArray[vertoffset + 15] = a1v.x;
vertexArray[vertoffset + 16] = a1v.y;
vertexArray[vertoffset + 17] = a1v.z;
vertexArray[vertoffset + 18] = a2v.x;
vertexArray[vertoffset + 19] = a2v.y;
vertexArray[vertoffset + 20] = a2v.z;
vertexArray[vertoffset + 21] = a2v.x;
vertexArray[vertoffset + 22] = a2v.y;
vertexArray[vertoffset + 23] = a2v.z;
for (j = 0; j < 8; ++j) {
colorArray[vertoffset + 3 * j] = color.r;
colorArray[vertoffset + 1 + 3 * j] = color.g;
colorArray[vertoffset + 2 + 3 * j] = color.b;
}
if (i > 0) {
// both points have distinct atoms
var diffAtoms = ((lastAtom !== undefined && currentAtom !== undefined) && lastAtom.serial !== currentAtom.serial);
for (j = 0; j < 4; j++) {
var face = [ offset + faces[j][0], offset + faces[j][1],
offset + faces[j][2], offset + faces[j][3] ];
faceoffset = geoGroup.faceidx;
faceArray[faceoffset] = face[0];
faceArray[faceoffset + 1] = face[1];
faceArray[faceoffset + 2] = face[3];
faceArray[faceoffset + 3] = face[1];
faceArray[faceoffset + 4] = face[2];
faceArray[faceoffset + 5] = face[3];
geoGroup.faceidx += 6;
if (currentAtom.clickable || lastAtom.clickable || currentAtom.hoverable || lastAtom.hoverable) {
var p1a = vs[face[3]].clone(), p1b = vs[face[0]]
.clone(), p2a = vs[face[2]].clone(), p2b = vs[face[1]]
.clone();
p1a.atom = vs[face[3]].atom || null; // should be
// same
p2a.atom = vs[face[2]].atom || null;
p1b.atom = vs[face[0]].atom || null; // should be
// same
p2b.atom = vs[face[1]].atom || null;
if (diffAtoms) {
var m1 = p1a.clone().add(p1b).multiplyScalar(0.5);
var m2 = p2a.clone().add(p2b).multiplyScalar(0.5);
var m = p1a.clone().add(p2b).multiplyScalar(0.5);
if (j % 2 === 0) {
if (lastAtom.clickable || lastAtom.hoverable) {
face1 = new $3Dmol.Triangle(m1, m, p1a);
face2 = new $3Dmol.Triangle(m2, p2a, m);
face3 = new $3Dmol.Triangle(m, p2a, p1a);
lastAtom.intersectionShape.triangle
.push(face1);
lastAtom.intersectionShape.triangle
.push(face2);
lastAtom.intersectionShape.triangle
.push(face3);
}
if (currentAtom.clickable || currentAtom.hoverable) {
face1 = new $3Dmol.Triangle(p1b, p2b, m);
face2 = new $3Dmol.Triangle(p2b, m2, m);
face3 = new $3Dmol.Triangle(p1b, m, m1);
currentAtom.intersectionShape.triangle
.push(face1);
currentAtom.intersectionShape.triangle
.push(face2);
currentAtom.intersectionShape.triangle
.push(face3);
}
} else {
if (currentAtom.clickable || currentAtom.hoverable) {
face1 = new $3Dmol.Triangle(m1, m, p1a);
face2 = new $3Dmol.Triangle(m2, p2a, m);
face3 = new $3Dmol.Triangle(m, p2a, p1a);
currentAtom.intersectionShape.triangle
.push(face1);
currentAtom.intersectionShape.triangle
.push(face2);
currentAtom.intersectionShape.triangle
.push(face3);
}
if (lastAtom.clickable || lastAtom.hoverable) {
face1 = new $3Dmol.Triangle(p1b, p2b, m);
face2 = new $3Dmol.Triangle(p2b, m2, m);
face3 = new $3Dmol.Triangle(p1b, m, m1);
lastAtom.intersectionShape.triangle
.push(face1);
lastAtom.intersectionShape.triangle
.push(face2);
lastAtom.intersectionShape.triangle
.push(face3);
}
}
}
// face for single atom
else if (currentAtom.clickable || currentAtom.hoverable) {
face1 = new $3Dmol.Triangle(p1b, p2b, p1a);
face2 = new $3Dmol.Triangle(p2b, p2a, p1a);
currentAtom.intersectionShape.triangle.push(face1);
currentAtom.intersectionShape.triangle.push(face2);
}
}
}
}
geoGroup.vertices += 8;
lastAtom = currentAtom;
}
var vsize = vs.length - 8; // Cap
geoGroup = geo.updateGeoGroup(8);
var vertexArray = geoGroup.vertexArray;
var colorArray = geoGroup.colorArray;
var faceArray = geoGroup.faceArray;
offset = geoGroup.vertices;
vertoffset = offset * 3;
faceoffset = geoGroup.faceidx;
for (i = 0; i < 4; i++) {
vs.push(vs[i * 2]);
vs.push(vs[vsize + i * 2]);
var v1 = vs[i * 2], v2 = vs[vsize + i * 2];
vertexArray[vertoffset + 6 * i] = v1.x;
vertexArray[vertoffset + 1 + 6 * i] = v1.y;
vertexArray[vertoffset + 2 + 6 * i] = v1.z;
vertexArray[vertoffset + 3 + 6 * i] = v2.x;
vertexArray[vertoffset + 4 + 6 * i] = v2.y;
vertexArray[vertoffset + 5 + 6 * i] = v2.z;
colorArray[vertoffset + 6 * i] = color.r;
colorArray[vertoffset + 1 + 6 * i] = color.g;
colorArray[vertoffset + 2 + 6 * i] = color.b;
colorArray[vertoffset + 3 + 6 * i] = color.r;
colorArray[vertoffset + 4 + 6 * i] = color.g;
colorArray[vertoffset + 5 + 6 * i] = color.b;
}
vsize += 8;
face1 = [ offset, offset + 2, offset + 6, offset + 4 ];
face2 = [ offset + 1, offset + 5, offset + 7, offset + 3 ];
faceArray[faceoffset] = face1[0];
faceArray[faceoffset + 1] = face1[1];
faceArray[faceoffset + 2] = face1[3];
faceArray[faceoffset + 3] = face1[1];
faceArray[faceoffset + 4] = face1[2];
faceArray[faceoffset + 5] = face1[3];
faceArray[faceoffset + 6] = face2[0];
faceArray[faceoffset + 7] = face2[1];
faceArray[faceoffset + 8] = face2[3];
faceArray[faceoffset + 9] = face2[1];
faceArray[faceoffset + 10] = face2[2];
faceArray[faceoffset + 11] = face2[3];
geoGroup.faceidx += 12;
geoGroup.vertices += 8;
// TODO: Add intersection planes for caps
// HalfEdgeRec used to store adjacency info of mesh
var HalfEdge = function(vertIdx) {
this.vert = vertIdx; // Vertex index at the end of this half-edge
this.twin = null; // Oppositely oriented adjacent half-edge
this.next = null; // Next half-edge around the face
};
var computeAdjacency = function(faces, faceCount, vertCount) {
// all pieces of the half-edge data structure
edges = [];
// a hash table to hold the adjacency info
// - Keys are pairs of vertex indices
// - Values are pointers to half-edge
var edgeTable = {};
var len = 0;
// Plow through faces and fill all half-edge info except twin
// pointers:
for (var i = 0; i < faceCount; i += 3) {
var A = faces[i];
var B = faces[i + 1];
var C = faces[i + 2];
// console.log("A="+A+ " B="+ B+ " C="+C);
// create the half-edge that goes from C to A
var CA = new HalfEdge(A);
edges.push(CA);
// create the half-edge that goes from A to B
var AB = new HalfEdge(B);
edges.push(AB);
// create the half-edge that goes from B to C
var BC = new HalfEdge(C);
edges.push(BC);
CA.next = AB;
AB.next = BC;
BC.next = CA;
edgeTable[C | (A << 16)] = CA;
edgeTable[A | (B << 16)] = AB;
edgeTable[B | (C << 16)] = BC;
}
// verify that the mesh is clean
for ( var key in edgeTable) {
if (edgeTable.hasOwnProperty(key)) {
len++;
}
}
if (len != faceCount * 3) {
console
.warn("Bad mesh: duplicated edges or inconsistent winding.len="
+ len
+ " faceCount="
+ faceCount
+ " vertCount=" + vertCount);
}
// Populate the twin pointers by iterating over the hash table
var boundaryCount = 0;
for ( var key in edgeTable) {
if (edgeTable.hasOwnProperty(key)) {
var twinKey = ((key & 0xffff) << 16) | (key >> 16);
if (edgeTable.hasOwnProperty(twinKey)) {
edgeTable[key].twin = edgeTable[twinKey];
edgeTable[twinKey].twin = edgeTable[key];
} else {
boundaryCount += 1;
}
}
}
var ret = new Uint16Array(faceCount * 6);
// Now that we have a half-edge structure, it's easy to create
// adjacency info for WebGL
if (boundaryCount > 0) {
console.log("Mesh is not watertight. Contains " + boundaryCount
+ " edges");
for (var i = 0; i < faceCount; i += 3) {
ret[i * 2 + 0] = edges[i + 2].vert;
ret[i * 2 + 1] = edges[i + 0].twin == null ? ret[i * 2 + 0]
: edges[i + 0].twin.next.vert;
ret[i * 2 + 2] = edges[i + 0].vert;
ret[i * 2 + 3] = edges[i + 1].twin == null ? ret[i * 2 + 1]
: edges[i + 1].twin.next.vert;
ret[i * 2 + 4] = edges[i + 1].vert;
ret[i * 2 + 5] = edges[i + 2].twin == null ? ret[i * 2 + 2]
: edges[i + 2].twin.next.vert;
}
} else {
for (var i = 0; i < faceCount; i += 3) {
ret[i * 2 + 0] = edges[i + 2].vert;
ret[i * 2 + 1] = edges[i + 0].twin.next.vert;
ret[i * 2 + 2] = edges[i + 0].vert;
ret[i * 2 + 3] = edges[i + 1].twin.next.vert;
ret[i * 2 + 4] = edges[i + 1].vert;
ret[i * 2 + 5] = edges[i + 2].twin.next.vert;
}
}
return ret;
};
// geoGroup.adjFaceArray =
// computeAdjacency(faceArray,faceArray.length,offset);
};
// TODO: Need to update this (will we ever use this?)
var drawSmoothCurve = function(group, _points, width, colors, div) {
if (_points.length === 0)
return;
div = (div === undefined) ? 5 : div;
var geo = new $3Dmol.Geometry();
var points = $3Dmol.subdivide_spline(_points, div);
/*
* for ( var i = 0; i < points.length; i++) {
* geo.vertices.push(points[i]); geo.colors.push($3Dmol.color(colors[(i ==
* 0) ? 0 : Math.round((i - 1) / div)])); }
*/
var lineMaterial = new $3Dmol.LineBasicMaterial({
linewidth : width
});
lineMaterial.vertexColors = true;
var line = new $3Dmol.Line(geo, lineMaterial);
line.type = $3Dmol.LineStrip;
group.add(line);
};
var drawStrip = function(geo, points, colors, div, thickness, opacity,
shape) {
if (!shape || shape === "default")
shape = "rectangle";
if (shape === 'edged')
drawPlainStrip(geo, points, colors, div, thickness, opacity);
else if (shape === "rectangle" || shape === "oval"
|| shape === "parabola")
drawShapeStrip(geo, points, colors, div, thickness, opacity, shape);
}
// check if given atom is an alpha carbon
var isAlphaCarbon = function(atom) {
return atom && atom.elem === "C" && atom.atom === "CA"; // note that
// calcium is
// also CA
}
// check whether two atoms are members of the same residue or subsequent,
// connected residues (a before b)
var inConnectedResidues = function(a, b) {
if (a && b && a.chain === b.chain) {
if ((a.reschain === b.reschain)
&& (a.resi === b.resi || a.resi === b.resi - 1))
return true;
if (a.resi < b.resi) {
// some PDBs have gaps in the numbering but the residues are
// still connected
// assume if within 4A they are connected
var dx = a.x - b.x;
var dy = a.y - b.y;
var dz = a.z - b.z;
var dist = dx * dx + dy * dy + dz * dz;
if (dist < 16.0)
return true; // calpha dist
}
}
return false;
}
// add geo to the group
var setGeo = function(group, geo, opacity, outline, setNormals) {
if(geo == null || geo.vertices == 0) return;
if (setNormals) {
geo.initTypedArrays();
geo.setUpNormals();
}
var cartoonMaterial = new $3Dmol.MeshDoubleLambertMaterial();
cartoonMaterial.vertexColors = $3Dmol.FaceColors;
if (typeof (opacity) === "number" && opacity >= 0 && opacity < 1) {
cartoonMaterial.transparent = true;
cartoonMaterial.opacity = opacity;
}
cartoonMaterial.outline = outline;
var cartoonMesh = new $3Dmol.Mesh(geo, cartoonMaterial);
group.add(cartoonMesh);
};
// proteins na backbone na terminus nucleobases
var cartoonAtoms = { "C":true, "CA":true, "O":true, "P":true, "OP2": true,
"O2P": true, "O5'": true, "O3'": true, "C5'":true,
"C2'": true, "O5*": true, "O3*": true, "C5*": true,
"C2*":true, "N1":true, "N3":true };
var purResns = { "DA":true, "DG":true, "A":true, "G":true};
var pyrResns = { "DT": true, "DC":true, "U":true, "C":true, "T":true };
var naResns = { "DA":true, "DG":true, "A":true, "G":true, "DT": true, "DC":true, "U":true, "C":true, "T":true };
var drawCartoon = function(group, atomList, gradientrange, fill,
doNotSmoothen, num, div) {
num = num || defaultNum;
div = div || defaultDiv;
var cartoon, prev, curr, next, currColor, nextColor, thickness, i, nextResAtom, arrow;
var backbonePt, orientPt, prevOrientPt, terminalPt, termOrientPt, baseStartPt, baseEndPt;
var tubeStart, tubeEnd, drawingTube;
var shapeGeo = new $3Dmol.Geometry(true); // for shapes that don't need normals computed
var geo = new $3Dmol.Geometry(true);
var colors = [];
var points = [];
var opacity = 1;
var outline = false;
var gradients = {};
for(var g in $3Dmol.Gradient.builtinGradients) {
if($3Dmol.Gradient.builtinGradients.hasOwnProperty(g)) {
//COUNTER INTUITIVE - spectrum reverses direction to gradient to match other tools
gradients[g] = new $3Dmol.Gradient.builtinGradients[g](gradientrange[1],gradientrange[0]);
}
}
var cartoonColor = function(next, cartoon) { //atom and cartoon style object
if (gradientrange && cartoon.color === 'spectrum') {
if(cartoon.colorscheme in gradients) {
return gradients[cartoon.colorscheme].valueToHex(next.resi);
} else {
return gradients['sinebow'].valueToHex(next.resi);
}
}
else {
return $3Dmol.getColorFromStyle(next, cartoon).getHex();
}
}
for (var i = 0; i < num; i++)
points[i] = [];
// first determine where beta sheet arrows and alpha helix tubes belong
var inSheet = false;
var inHelix = false; //only considering tube styled helices
i = 0;
var atoms = [];
for (i in atomList) {
next = atomList[i];
if (next.elem === 'C' && next.atom === 'CA') {
var connected = inConnectedResidues(curr, next);
// last two residues in a beta sheet become arrowhead
if (connected && next.ss === "s") {
inSheet = true;
} else if (inSheet) {
if (curr && prev && curr.style.cartoon.arrows
&& prev.style.cartoon.arrows) {
curr.ss = "arrow end";
prev.ss = "arrow start";
}
inSheet = false;
}
// first and last residues in a helix are used to draw tube
if (connected && (curr.ss === "h" || curr.ss == "tube start") && curr.style.cartoon.tubes) {
if (!inHelix && curr.ss != "tube start" && next.style.cartoon.tubes) {
next.ss = "tube start";
inHelix = true;
}
} else if (inHelix) {
if (curr.ss === "tube start") {
curr.ss = "tube end"; //only one residue
} else if (prev && prev.style.cartoon.tubes) {
prev.ss = "tube end";
}
inHelix = false;
}
prev = curr;
curr = next;
}
if(next && next.atom in cartoonAtoms) {
atoms.push(next);
}
}
if(inHelix && curr.style.cartoon.tubes) {
curr.ss = "tube end";
inHelix = false;
}
var flushGeom = function(connect) {
//write out points, update geom,etc
for (var i = 0; !thickness && i < num; i++)
drawSmoothCurve(group, points[i], 1, colors, div, opacity);
if (fill && points[0].length > 0) {
drawStrip(geo, points, colors, div, thickness, opacity,
points.style);
}
if(connect) {
//recycle last point to first point of next points array
var saved = [];
for(i = 0; i < num; i++) {
saved[i] = points[i][points[i].length-1];
}
var savedc = colors[colors.length-1];
}
points = [];