1
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
2
|
// Copyright 2023 Leszek Koltunski leszek@koltunski.pl //
|
3
|
// //
|
4
|
// This file is part of Distorted. //
|
5
|
// //
|
6
|
// This library is free software; you can redistribute it and/or //
|
7
|
// modify it under the terms of the GNU Lesser General Public //
|
8
|
// License as published by the Free Software Foundation; either //
|
9
|
// version 2.1 of the License, or (at your option) any later version. //
|
10
|
// //
|
11
|
// This library is distributed in the hope that it will be useful, //
|
12
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
|
13
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU //
|
14
|
// Lesser General Public License for more details. //
|
15
|
// //
|
16
|
// You should have received a copy of the GNU Lesser General Public //
|
17
|
// License along with this library; if not, write to the Free Software //
|
18
|
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA //
|
19
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
20
|
|
21
|
package org.distorted.library.mesh;
|
22
|
|
23
|
import java.util.ArrayList;
|
24
|
|
25
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
26
|
|
27
|
/**
|
28
|
* Create a 'multigon' mesh - a union of several polygons.
|
29
|
*
|
30
|
* <p>
|
31
|
* Specify several lists of vertices. Each list defines one polygon. (@see MeshPolygon).
|
32
|
* If two such polygons share an edge (or several edges) then the edge in both of them is
|
33
|
* marked 'up'.
|
34
|
*/
|
35
|
public class MeshMultigon extends MeshBase
|
36
|
{
|
37
|
private static final float MAX_ERROR = 0.000001f;
|
38
|
private float[][] mOuterVertices;
|
39
|
private float[][] mOuterVectors;
|
40
|
private int mNumOuter;
|
41
|
|
42
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
43
|
|
44
|
private boolean isSame(float dx, float dy)
|
45
|
{
|
46
|
return (dx*dx + dy*dy < MAX_ERROR);
|
47
|
}
|
48
|
|
49
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
50
|
|
51
|
private int isUp(float[][] vertices, int polygon, int edge)
|
52
|
{
|
53
|
float[] p= vertices[polygon];
|
54
|
int lenP = p.length/2;
|
55
|
int len = vertices.length;
|
56
|
int next = (edge==lenP-1 ? 0 : edge+1);
|
57
|
|
58
|
float v1x = p[2*edge ];
|
59
|
float v1y = p[2*edge+1];
|
60
|
float v2x = p[2*next ];
|
61
|
float v2y = p[2*next+1];
|
62
|
|
63
|
for(int i=0; i<len; i++)
|
64
|
if( i!=polygon )
|
65
|
{
|
66
|
int num = vertices[i].length/2;
|
67
|
|
68
|
for(int j=0; j<num; j++)
|
69
|
{
|
70
|
int n = (j==num-1 ? 0 : j+1);
|
71
|
float[] v = vertices[i];
|
72
|
float x1 = v[2*j ];
|
73
|
float y1 = v[2*j+1];
|
74
|
float x2 = v[2*n ];
|
75
|
float y2 = v[2*n+1];
|
76
|
|
77
|
if( isSame(v2x-x1,v2y-y1) && isSame(v1x-x2,v1y-y2) ) return i;
|
78
|
}
|
79
|
}
|
80
|
|
81
|
return -1;
|
82
|
}
|
83
|
|
84
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
85
|
|
86
|
private int[][] computeEdgesUp(float[][] vertices)
|
87
|
{
|
88
|
int num = vertices.length;
|
89
|
int[][] up = new int[num][];
|
90
|
|
91
|
for(int i=0; i<num; i++)
|
92
|
{
|
93
|
int len = vertices[i].length/2;
|
94
|
up[i] = new int[len];
|
95
|
for(int j=0; j<len; j++) up[i][j] = isUp(vertices,i,j);
|
96
|
}
|
97
|
|
98
|
return up;
|
99
|
}
|
100
|
|
101
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
102
|
|
103
|
private float[] detectFirstOuterVertex(float[][] vertices)
|
104
|
{
|
105
|
float X = -Float.MAX_VALUE;
|
106
|
int I=0,J=0, len = vertices.length;
|
107
|
|
108
|
for(int i=0; i<len; i++ )
|
109
|
{
|
110
|
float[] v = vertices[i];
|
111
|
int num = v.length/2;
|
112
|
|
113
|
for(int j=0; j<num; j++)
|
114
|
if(v[2*j]>X)
|
115
|
{
|
116
|
X = v[2*j];
|
117
|
I = i;
|
118
|
J = j;
|
119
|
}
|
120
|
}
|
121
|
|
122
|
float[] v = vertices[I];
|
123
|
return new float[] {v[2*J],v[2*J+1]};
|
124
|
}
|
125
|
|
126
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
127
|
|
128
|
private double computeAngle(float x1,float y1, float x2, float y2)
|
129
|
{
|
130
|
double diff = Math.atan2(y2,x2)-Math.atan2(y1,x1);
|
131
|
return diff<0 ? diff+(2*Math.PI) : diff;
|
132
|
}
|
133
|
|
134
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
135
|
|
136
|
private float[] detectNextOuterVertex(float[][] vertices, float[] curr, float[] vect)
|
137
|
{
|
138
|
double minAngle = 2*Math.PI;
|
139
|
float x=0, y=0;
|
140
|
|
141
|
for( float[] v : vertices )
|
142
|
{
|
143
|
int num = v.length/2;
|
144
|
|
145
|
for( int j=0; j<num; j++)
|
146
|
{
|
147
|
float xc = v[2*j];
|
148
|
float yc = v[2*j+1];
|
149
|
|
150
|
if( isSame(xc-curr[0],yc-curr[1]) )
|
151
|
{
|
152
|
int n = (j==num-1 ? 0 : j+1);
|
153
|
float xn = v[2*n];
|
154
|
float yn = v[2*n+1];
|
155
|
|
156
|
double angle = computeAngle(vect[0], vect[1], xn-xc, yn-yc);
|
157
|
|
158
|
if (angle < minAngle)
|
159
|
{
|
160
|
minAngle = angle;
|
161
|
x = xn;
|
162
|
y = yn;
|
163
|
}
|
164
|
|
165
|
break;
|
166
|
}
|
167
|
}
|
168
|
}
|
169
|
|
170
|
return new float[] {x,y};
|
171
|
}
|
172
|
|
173
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
174
|
|
175
|
private void computeOuterVectors()
|
176
|
{
|
177
|
mOuterVectors = new float[mNumOuter][];
|
178
|
|
179
|
for(int curr=0; curr<mNumOuter; curr++)
|
180
|
{
|
181
|
int prev = curr==0 ? mNumOuter-1 : curr-1;
|
182
|
int next = curr==mNumOuter-1 ? 0 : curr+1;
|
183
|
|
184
|
float[] vP = mOuterVertices[prev];
|
185
|
float[] vN = mOuterVertices[next];
|
186
|
|
187
|
float dx = vP[0]-vN[0];
|
188
|
float dy = vP[1]-vN[1];
|
189
|
|
190
|
mOuterVectors[curr] = new float[] { dy,-dx };
|
191
|
}
|
192
|
}
|
193
|
|
194
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
195
|
|
196
|
private void computeOuterVertices(float[][] vertices)
|
197
|
{
|
198
|
ArrayList<float[]> tmp = new ArrayList<>();
|
199
|
|
200
|
float[] vect = new float[] {1,0};
|
201
|
float[] first= detectFirstOuterVertex(vertices);
|
202
|
float[] next = first;
|
203
|
|
204
|
do
|
205
|
{
|
206
|
float[] prev = next;
|
207
|
next = detectNextOuterVertex(vertices,next,vect);
|
208
|
vect[0] = prev[0]-next[0];
|
209
|
vect[1] = prev[1]-next[1];
|
210
|
tmp.add(next);
|
211
|
}
|
212
|
while( !isSame(next[0]-first[0],next[1]-first[1]) );
|
213
|
|
214
|
mNumOuter = tmp.size();
|
215
|
mOuterVertices = new float[mNumOuter][];
|
216
|
for(int i=0; i<mNumOuter; i++) mOuterVertices[i] = tmp.remove(0);
|
217
|
}
|
218
|
|
219
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
220
|
|
221
|
private int belongsToOuter(float x, float y)
|
222
|
{
|
223
|
for( int i=0; i<mNumOuter; i++ )
|
224
|
{
|
225
|
float[] v = mOuterVertices[i];
|
226
|
if( isSame(x-v[0],y-v[1]) ) return i;
|
227
|
}
|
228
|
|
229
|
return -1;
|
230
|
}
|
231
|
|
232
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
233
|
|
234
|
private boolean[][] computeVertsUp(float[][] vertices)
|
235
|
{
|
236
|
int num = vertices.length;
|
237
|
boolean[][] up = new boolean[num][];
|
238
|
|
239
|
for(int i=0; i<num; i++)
|
240
|
{
|
241
|
float[] v = vertices[i];
|
242
|
int len = v.length/2;
|
243
|
up[i] = new boolean[len];
|
244
|
|
245
|
for(int j=0; j<len; j++)
|
246
|
{
|
247
|
int vert = belongsToOuter(v[2*j],v[2*j+1]);
|
248
|
up[i][j] = (vert==-1);
|
249
|
}
|
250
|
}
|
251
|
|
252
|
return up;
|
253
|
}
|
254
|
|
255
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
256
|
|
257
|
private float[] computeCenter(float[] vertices)
|
258
|
{
|
259
|
int num = vertices.length/2;
|
260
|
float[] ret = new float[2];
|
261
|
|
262
|
for(int i=0; i<num; i++)
|
263
|
{
|
264
|
ret[0] += vertices[2*i];
|
265
|
ret[1] += vertices[2*i+1];
|
266
|
}
|
267
|
|
268
|
ret[0] /= num;
|
269
|
ret[1] /= num;
|
270
|
|
271
|
return ret;
|
272
|
}
|
273
|
|
274
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
275
|
|
276
|
private float[][] computeCenters(float[][] vertices)
|
277
|
{
|
278
|
int num = vertices.length;
|
279
|
float[][] ret = new float[num][];
|
280
|
for(int i=0; i<num; i++) ret[i] = computeCenter(vertices[i]);
|
281
|
return ret;
|
282
|
}
|
283
|
|
284
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
285
|
|
286
|
private int computeMode(float[] vL, float[] vR, float[] vT, float[] normL, float[] normR,
|
287
|
int[][] edgesUp, boolean[][] vertsUp, float[][] vertices, float[][] centers, int component, int curr)
|
288
|
{
|
289
|
float[] v = vertices[component];
|
290
|
int[] edges = edgesUp[component];
|
291
|
int len = v.length /2;
|
292
|
int next= curr==len-1 ? 0 : curr+1;
|
293
|
int prev= curr==0 ? len-1 : curr-1;
|
294
|
int eupc = edges[curr];
|
295
|
|
296
|
if( eupc<0 )
|
297
|
{
|
298
|
vL[0] = v[2*curr];
|
299
|
vL[1] = v[2*curr+1];
|
300
|
vR[0] = v[2*next];
|
301
|
vR[1] = v[2*next+1];
|
302
|
vT[0] = centers[component][0];
|
303
|
vT[1] = centers[component][1];
|
304
|
|
305
|
int outerL = belongsToOuter(vL[0],vL[1]);
|
306
|
int outerR = belongsToOuter(vR[0],vR[1]);
|
307
|
|
308
|
if( outerL>=0 && outerR>=0 )
|
309
|
{
|
310
|
float[] vl =mOuterVectors[outerL];
|
311
|
normL[0] = -vl[0];
|
312
|
normL[1] = -vl[1];
|
313
|
float[] vr =mOuterVectors[outerR];
|
314
|
normR[0] = -vr[0];
|
315
|
normR[1] = -vr[1];
|
316
|
}
|
317
|
else
|
318
|
{
|
319
|
int eupp = edges[prev];
|
320
|
int eupn = edges[next];
|
321
|
|
322
|
if( eupp<0 )
|
323
|
{
|
324
|
normL[0]=vL[0]-vT[0];
|
325
|
normL[1]=vL[1]-vT[1];
|
326
|
}
|
327
|
else
|
328
|
{
|
329
|
normL[0]= v[2*curr ] - v[2*prev ];
|
330
|
normL[1]= v[2*curr+1] - v[2*prev+1];
|
331
|
}
|
332
|
|
333
|
if( eupn<0 )
|
334
|
{
|
335
|
normR[0]=vR[0]-vT[0];
|
336
|
normR[1]=vR[1]-vT[1];
|
337
|
}
|
338
|
else
|
339
|
{
|
340
|
int nnxt= next==len-1 ? 0 : next+1;
|
341
|
normR[0]= v[2*next ] - v[2*nnxt ];
|
342
|
normR[1]= v[2*next+1] - v[2*nnxt+1];
|
343
|
}
|
344
|
}
|
345
|
|
346
|
return MeshBandedTriangle.MODE_NORMAL;
|
347
|
}
|
348
|
else
|
349
|
{
|
350
|
vL[0] = centers[eupc][0];
|
351
|
vL[1] = centers[eupc][1];
|
352
|
vR[0] = centers[component][0];
|
353
|
vR[1] = centers[component][1];
|
354
|
vT[0] = v[2*curr];
|
355
|
vT[1] = v[2*curr+1];
|
356
|
|
357
|
boolean vup = vertsUp[component][curr];
|
358
|
|
359
|
if( vup )
|
360
|
{
|
361
|
normL[0]=0;
|
362
|
normL[1]=1;
|
363
|
normR[0]=0;
|
364
|
normR[1]=1;
|
365
|
|
366
|
return MeshBandedTriangle.MODE_FLAT;
|
367
|
}
|
368
|
else
|
369
|
{
|
370
|
int outerT = belongsToOuter(vT[0],vT[1]);
|
371
|
|
372
|
if( outerT>=0 )
|
373
|
{
|
374
|
float[] vt =mOuterVectors[outerT];
|
375
|
normL[0]= vt[0];
|
376
|
normL[1]= vt[1];
|
377
|
normR[0]= vt[0];
|
378
|
normR[1]= vt[1];
|
379
|
}
|
380
|
else
|
381
|
{
|
382
|
float dx = v[2*next ]-v[2*curr ];
|
383
|
float dy = v[2*next+1]-v[2*curr+1];
|
384
|
normL[0]= dx;
|
385
|
normL[1]= dy;
|
386
|
normR[0]= dx;
|
387
|
normR[1]= dy;
|
388
|
}
|
389
|
|
390
|
return MeshBandedTriangle.MODE_INVERTED;
|
391
|
}
|
392
|
}
|
393
|
}
|
394
|
|
395
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
396
|
// PUBLIC API
|
397
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
398
|
/**
|
399
|
* Specify several lists of vertices. Each list defines one polygon. (@see MeshPolygon).
|
400
|
* If two such polygons share an edge (or several edges) then the edge in both of them is
|
401
|
* marked 'up'.
|
402
|
*
|
403
|
* @param vertices an array of arrays, each specifying vertices of a single polygon.
|
404
|
* @param band see MeshPolygon. Shared among all polygons.
|
405
|
* @param exBands see MeshPolygon. Shared among all polygons.
|
406
|
* @param exVertices see MeshPolygon. Shared among all polygons.
|
407
|
*/
|
408
|
public MeshMultigon(float[][] vertices, float[] band, int exBands, int exVertices)
|
409
|
{
|
410
|
super();
|
411
|
|
412
|
int numTriangles=0;
|
413
|
for(float[] vertex : vertices) numTriangles+=vertex.length/2;
|
414
|
MeshBandedTriangle[] triangles = new MeshBandedTriangle[numTriangles];
|
415
|
|
416
|
computeOuterVertices(vertices);
|
417
|
computeOuterVectors();
|
418
|
|
419
|
int[][] edgesUp = computeEdgesUp(vertices);
|
420
|
boolean[][] vertsUp = computeVertsUp(vertices);
|
421
|
float[][] centers = computeCenters(vertices);
|
422
|
|
423
|
float[] vL = new float[2];
|
424
|
float[] vR = new float[2];
|
425
|
float[] vT = new float[2];
|
426
|
float[] normL = new float[2];
|
427
|
float[] normR = new float[2];
|
428
|
|
429
|
int index=0,len = vertices.length;
|
430
|
|
431
|
for(int i=0; i<len; i++)
|
432
|
{
|
433
|
int num=vertices[i].length/2;
|
434
|
|
435
|
for(int j=0; j<num; j++)
|
436
|
{
|
437
|
int mode=computeMode(vL, vR, vT, normL, normR, edgesUp, vertsUp,vertices,centers, i,j);
|
438
|
triangles[index++] = new MeshBandedTriangle(vL, vR, vT, band, normL, normR, mode, exBands, exVertices);
|
439
|
}
|
440
|
}
|
441
|
|
442
|
join(triangles);
|
443
|
mergeEffComponents();
|
444
|
mergeTexComponents();
|
445
|
}
|
446
|
|
447
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
448
|
/**
|
449
|
* Copy constructor.
|
450
|
*/
|
451
|
public MeshMultigon(MeshMultigon mesh, boolean deep)
|
452
|
{
|
453
|
super(mesh,deep);
|
454
|
}
|
455
|
|
456
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
457
|
/**
|
458
|
* Copy the Mesh.
|
459
|
*
|
460
|
* @param deep If to be a deep or shallow copy of mVertAttribs1, i.e. the array holding vertices,
|
461
|
* normals and inflates (the rest, in particular the mVertAttribs2 containing texture
|
462
|
* coordinates and effect associations, is always deep copied)
|
463
|
*/
|
464
|
public MeshMultigon copy(boolean deep)
|
465
|
{
|
466
|
return new MeshMultigon(this,deep);
|
467
|
}
|
468
|
}
|