CoordsysNode.cc 18.8 KB
Newer Older
Jan Möbius's avatar
Jan Möbius committed
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
/*===========================================================================*\
 *                                                                           *
 *                              OpenFlipper                                  *
 *      Copyright (C) 2001-2009 by Computer Graphics Group, RWTH Aachen      *
 *                           www.openflipper.org                             *
 *                                                                           *
 *---------------------------------------------------------------------------*
 *  This file is part of OpenFlipper.                                        *
 *                                                                           *
 *  OpenFlipper is free software: you can redistribute it and/or modify      *
 *  it under the terms of the GNU Lesser General Public License as           *
 *  published by the Free Software Foundation, either version 3 of           *
 *  the License, or (at your option) any later version with the              *
 *  following exceptions:                                                    *
 *                                                                           *
 *  If other files instantiate templates or use macros                       *
 *  or inline functions from this file, or you compile this file and         *
 *  link it with other files to produce an executable, this file does        *
 *  not by itself cause the resulting executable to be covered by the        *
 *  GNU Lesser General Public License. This exception does not however       *
 *  invalidate any other reasons why the executable file might be            *
 *  covered by the GNU Lesser General Public License.                        *
 *                                                                           *
 *  OpenFlipper is distributed in the hope that it will be useful,           *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of           *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            *
 *  GNU Lesser General Public License for more details.                      *
 *                                                                           *
 *  You should have received a copy of the GNU LesserGeneral Public          *
 *  License along with OpenFlipper. If not,                                  *
 *  see <http://www.gnu.org/licenses/>.                                      *
 *                                                                           *
\*===========================================================================*/

/*===========================================================================*\
 *                                                                           *
Jan Möbius's avatar
Jan Möbius committed
37
 *   $Revision$                                                       *
Jan Möbius's avatar
Jan Möbius committed
38
39
40
41
 *   $Author$                                                      *
 *   $Date$                   *
 *                                                                           *
\*===========================================================================*/
Jan Möbius's avatar
 
Jan Möbius committed
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




//=============================================================================
//
//  CLASS CoordsysNode - IMPLEMENTATION
//
//=============================================================================

//== INCLUDES =================================================================

#include "CoordsysNode.hh"
#include "../GL/gl.hh"
#include <iostream>
#include <math.h>


//== NAMESPACES ===============================================================

namespace ACG {
namespace SceneGraph {


//== IMPLEMENTATION ==========================================================


void
CoordsysNode::
71
boundingBox(Vec3f& /*_bbMin*/, Vec3f& /*_bbMax*/)
Jan Möbius's avatar
 
Jan Möbius committed
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
{
	//_bbMin.minimize( Vect3f  )
}


//----------------------------------------------------------------------------


unsigned int
CoordsysNode::
availableDrawModes() const
{
  return ( DrawModes::POINTS |
	        DrawModes::POINTS_SHADED |
	        DrawModes::POINTS_COLORED );
}


//----------------------------------------------------------------------------

void
CoordsysNode::
drawCoordsys( GLState&  _state) {

  double topRadius = 0.01;
  double arrowLength = 0.04;
  double bodyRadius = 0.004;
  double bodyLength = 0.06;
  int slices = 10;
  int stacks = 10;
  int loops = 10;
  double sphereRadius = 0.01;

  GLUquadricObj *quadric = gluNewQuadric();

  // Origin
  glColor3f(0.5, 0.5, 0.5);
  gluSphere( quadric, sphereRadius, slices, stacks );

  // X-Axis
  glColor3f(1.0, 0.0, 0.0);
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
113
114
115
  _state.push_modelview_matrix ();
  _state.rotate (-90, 0, 1, 0);
  _state.translate ( 0, 0, -bodyLength );
Jan Möbius's avatar
 
Jan Möbius committed
116
117
  gluCylinder( quadric, bodyRadius, bodyRadius, bodyLength, slices, stacks );
  gluDisk( quadric, 0, topRadius, slices, loops );
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
118
  _state.translate ( 0, 0, -arrowLength );
Jan Möbius's avatar
 
Jan Möbius committed
119
  gluCylinder( quadric, 0, topRadius, arrowLength, slices, stacks );
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
120
  _state.pop_modelview_matrix ();
Jan Möbius's avatar
 
Jan Möbius committed
121
122
123

  // Y-Axis
  glColor3f(0.0, 1.0, 0.0);
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
124
125
126
  _state.push_modelview_matrix ();
  _state.rotate (90, 1, 0, 0);
  _state.translate ( 0, 0, -bodyLength );
Jan Möbius's avatar
 
Jan Möbius committed
127
128
  gluCylinder( quadric, bodyRadius, bodyRadius, bodyLength, slices, stacks );
  gluDisk( quadric, 0, topRadius, slices, loops );
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
129
  _state.translate ( 0, 0, -arrowLength );
Jan Möbius's avatar
 
Jan Möbius committed
130
  gluCylinder( quadric, 0, topRadius, arrowLength, slices, stacks );
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
131
  _state.pop_modelview_matrix ();
Jan Möbius's avatar
 
Jan Möbius committed
132
133
134

  // Z-Axis
  glColor3f(0.0, 0.0, 1.0);
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
135
136
137
  _state.push_modelview_matrix ();
  _state.rotate (180, 0, 1, 0);
  _state.translate ( 0, 0, -bodyLength );
Jan Möbius's avatar
 
Jan Möbius committed
138
139
  gluCylinder( quadric, bodyRadius, bodyRadius, bodyLength, slices, stacks );
  gluDisk( quadric, 0, topRadius, slices, loops );
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
140
  _state.translate ( 0, 0, -arrowLength );
Jan Möbius's avatar
 
Jan Möbius committed
141
  gluCylinder( quadric, 0, topRadius, arrowLength, slices, stacks );
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
142
  _state.pop_modelview_matrix ();
Jan Möbius's avatar
 
Jan Möbius committed
143
144
145
146
147
148
149
150
151

  gluDeleteQuadric(quadric);
}

//============================================================================

void
CoordsysNode::drawCoordsysPick( GLState&  _state) {

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
152
153
154
155
156
157
158
159
  double topRadius = 0.01;
  double arrowLength = 0.04;
  double bodyRadius = 0.004;
  double bodyLength = 0.06;
  int slices = 10;
  int stacks = 10;
  int loops = 10;
  double sphereRadius = 0.01;
Jan Möbius's avatar
 
Jan Möbius committed
160

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
161
  GLUquadricObj *quadric = gluNewQuadric();
Jan Möbius's avatar
 
Jan Möbius committed
162
163

  // Origin
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
164
165
  _state.pick_set_name (1);
  gluSphere( quadric, sphereRadius, slices, stacks );
Jan Möbius's avatar
 
Jan Möbius committed
166
167

  // X-Axis
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
168
169
170
171
172
173
174
175
176
  _state.pick_set_name (2);
  _state.push_modelview_matrix ();
  _state.rotate (-90, 0, 1, 0);
  _state.translate ( 0, 0, -bodyLength );
  gluCylinder( quadric, bodyRadius, bodyRadius, bodyLength, slices, stacks );
  gluDisk( quadric, 0, topRadius, slices, loops );
  _state.translate ( 0, 0, -arrowLength );
  gluCylinder( quadric, 0, topRadius, arrowLength, slices, stacks );
  _state.pop_modelview_matrix ();
Jan Möbius's avatar
 
Jan Möbius committed
177
178

  // Y-Axis
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
179
180
181
182
183
184
185
186
187
  _state.pick_set_name (3);
  _state.push_modelview_matrix ();
  _state.rotate (90, 1, 0, 0);
  _state.translate ( 0, 0, -bodyLength );
  gluCylinder( quadric, bodyRadius, bodyRadius, bodyLength, slices, stacks );
  gluDisk( quadric, 0, topRadius, slices, loops );
  _state.translate ( 0, 0, -arrowLength );
  gluCylinder( quadric, 0, topRadius, arrowLength, slices, stacks );
  _state.pop_modelview_matrix ();
Jan Möbius's avatar
 
Jan Möbius committed
188
189

  // Z-Axis
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
190
191
192
193
194
195
196
197
198
199
200
201
  _state.pick_set_name (4);
  _state.push_modelview_matrix ();
  _state.rotate (180, 0, 1, 0);
  _state.translate ( 0, 0, -bodyLength );
  gluCylinder( quadric, bodyRadius, bodyRadius, bodyLength, slices, stacks );
  gluDisk( quadric, 0, topRadius, slices, loops );
  _state.translate ( 0, 0, -arrowLength );
  gluCylinder( quadric, 0, topRadius, arrowLength, slices, stacks );
  _state.pop_modelview_matrix ();


  gluDeleteQuadric(quadric);
Jan Möbius's avatar
 
Jan Möbius committed
202
203
204
205
206
207
208
209
210
211
212

}


//============================================================================


void
CoordsysNode::
draw(GLState&  _state  , unsigned int /*_drawMode*/)
{
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
213
214
215
  GLboolean colorMask[4];
  glGetBooleanv (GL_COLOR_WRITEMASK, colorMask);
  
Jan Möbius's avatar
 
Jan Möbius committed
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
  // Push Modelview-Matrix
  _state.push_modelview_matrix();

  Vec4f lastBaseColor = _state.base_color();

  glPushAttrib( GL_LIGHTING_BIT ); // STACK_ATTRIBUTES <- LIGHTING_ATTRIBUTE
  glEnable(GL_LIGHTING);
  glColorMaterial ( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE ) ;
  glEnable(GL_COLOR_MATERIAL);
  glShadeModel(GL_SMOOTH);

  // Init state - changes when mode_ != POSITION
  Vec3d pos3D(0.0,0.0,0.0);

  if ( mode_ == SCREENPOS ) {

    int left, bottom, width, height;
    _state.get_viewport(left, bottom, width, height);

    // Projection reset
    _state.push_projection_matrix();
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
237
238
    _state.reset_projection();
    _state.perspective(45.0, _state.aspect(), 0.8, 20.0);
Jan Möbius's avatar
 
Jan Möbius committed
239
240
241
242
243
244

    float posx = left + width - 30.0 ;
    float posy = bottom + height - 30.0 ;

    Vec3d screenposCenterPoint( posx , posy , 0.0);

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
245
246
    _state.push_modelview_matrix();
    _state.reset_modelview();
Jan Möbius's avatar
 
Jan Möbius committed
247

248
    // get our desired coordsys position in scene coordinates
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
249
250
    pos3D = _state.unproject (Vec3d (posx, posy, 0.5));
    _state.pop_modelview_matrix();
Jan Möbius's avatar
 
Jan Möbius committed
251

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
252
    // reset scene translation
253
    // we want only the scene rotation to rotate the coordsys
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
254
    GLMatrixd modelview = _state.modelview();
Jan Möbius's avatar
 
Jan Möbius committed
255

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
256
257
258
    modelview(0,3) = 0.0;
    modelview(1,3) = 0.0;
    modelview(2,3) = 0.0;
Jan Möbius's avatar
 
Jan Möbius committed
259

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
260
261
    _state.set_modelview (modelview);
    _state.translate (pos3D[0], pos3D[1], pos3D[2]-0.3, MULT_FROM_LEFT);
Jan Möbius's avatar
 
Jan Möbius committed
262

263
264

    // clear the depth buffer behind the coordsys
265
266
267
268
    glDepthRange (1.0, 1.0);
    glDepthFunc (GL_ALWAYS);

    drawCoordsys(_state);
269

270
271
    glDepthRange (0.0, 1.0);
    glDepthFunc (GL_LESS);
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
272

273
    // draw coordsys
Jan Möbius's avatar
 
Jan Möbius committed
274
275
    drawCoordsys(_state);

276
277
278
279
    // set depth buffer to 0 so tah nothing can paint over cordsys
    glDepthRange (0.0, 0.0);
    glDepthFunc (GL_ALWAYS);
    glColorMask(GL_FALSE,GL_FALSE,GL_FALSE,GL_FALSE);
280

281
282
283
284
285
    // Koordinatensystem zeichnen
    drawCoordsys(_state);

    glDepthRange (0.0, 1.0);
    glDepthFunc (GL_LESS);
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
286
    glColorMask (colorMask[0], colorMask[1], colorMask[2], colorMask[3]);
287

Jan Möbius's avatar
 
Jan Möbius committed
288
289
    // Projection reload
    _state.pop_projection_matrix();
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
290

Jan Möbius's avatar
 
Jan Möbius committed
291
292
293

  } else if (mode_ == POSITION) { /* mode_ == POSITION */

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
294
295
296
297
298
299
300
    GLMatrixd modelview = _state.modelview();

    modelview(0,3) = 0.0;
    modelview(1,3) = 0.0;
    modelview(2,3) = 0.0;

    _state.set_modelview (modelview);
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
301

302
303
304
305
306
307
308
309
310
311
    // clear depth buffer in coordsys region
    glDepthRange (1.0, 1.0);
    glDepthFunc (GL_ALWAYS);

    // Koordinatensystem zeichnen
    drawCoordsys(_state);

    // draw coordsys in normal mode
    glDepthRange (0.0, 1.0);
    glDepthFunc (GL_LESS);
312

313
    // Koordinatensystem zeichnen
Jan Möbius's avatar
 
Jan Möbius committed
314
315
    drawCoordsys(_state);

316
317
318
319
320
321
322
    // set depth buffer to 0 so tah nothing can paint over cordsys
    glDepthRange (0.0, 0.0);
    glDepthFunc (GL_ALWAYS);
    glColorMask(GL_FALSE,GL_FALSE,GL_FALSE,GL_FALSE);

    // Koordinatensystem zeichnen
    drawCoordsys(_state);
323

324
325
326
    // reset to default
    glDepthRange (0.0, 1.0);
    glDepthFunc (GL_LESS);
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
327
    glColorMask (colorMask[0], colorMask[1], colorMask[2], colorMask[3]);
328

Jan Möbius's avatar
 
Jan Möbius committed
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
  }

  glPopAttrib();

  glColor4fv(lastBaseColor.data());

  // Reload old configuration
  _state.pop_modelview_matrix();
}


void
CoordsysNode::
setMode(const CoordsysMode _mode)
{
  mode_ = _mode;
}

void
CoordsysNode::
setPosition(const Vec3f& _pos)
{
  pos3f_ = _pos;
}

CoordsysNode::CoordsysMode
CoordsysNode::
getMode() const
{
  return mode_;
}

void
CoordsysNode::pick(GLState& _state, PickTarget _target)
{
Jan Möbius's avatar
Jan Möbius committed
364
365
  if (_target == PICK_ANYTHING) {

Jan Möbius's avatar
Jan Möbius committed
366
367
    GLdouble mat[16];

Jan Möbius's avatar
 
Jan Möbius committed
368
    // Push Modelview-Matrix
Jan Möbius's avatar
Jan Möbius committed
369
    _state.push_modelview_matrix();
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
370
    _state.pick_set_maximum (5);
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
371
    _state.pick_set_name (0);
Jan Möbius's avatar
 
Jan Möbius committed
372
373

    // Init state - changes when mode_ != POSITION
Jan Möbius's avatar
Jan Möbius committed
374
    Vec3d pos3D(0.0,0.0,0.0);
Jan Möbius's avatar
 
Jan Möbius committed
375

Jan Möbius's avatar
Jan Möbius committed
376
    if ( mode_ == SCREENPOS ) {
Jan Möbius's avatar
 
Jan Möbius committed
377

Jan Möbius's avatar
Jan Möbius committed
378
379
      int left, bottom, width, height;
      _state.get_viewport(left, bottom, width, height);
Jan Möbius's avatar
 
Jan Möbius committed
380

Jan Möbius's avatar
Jan Möbius committed
381
382
      // Projection reset
      _state.push_projection_matrix();
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
383
384
      _state.reset_projection();
      _state.perspective(45.0, _state.aspect(), 0.8, 20.0);
Jan Möbius's avatar
 
Jan Möbius committed
385

Jan Möbius's avatar
Jan Möbius committed
386
387
      float posx = left + width - 30.0 ;
      float posy = bottom + height - 30.0 ;
Jan Möbius's avatar
 
Jan Möbius committed
388

Jan Möbius's avatar
Jan Möbius committed
389
      Vec3d screenposCenterPoint( posx , posy , 0.0);
Jan Möbius's avatar
 
Jan Möbius committed
390

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
391
392
      _state.push_modelview_matrix();
      _state.reset_modelview();
Jan Möbius's avatar
 
Jan Möbius committed
393

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
394
395
      pos3D = _state.unproject (Vec3d (posx, posy, 0.5));
      _state.pop_modelview_matrix();
Jan Möbius's avatar
 
Jan Möbius committed
396

Jan Möbius's avatar
Jan Möbius committed
397
398
399
      // Projection reload
      _state.pop_projection_matrix();

400
401
402
      // The selection buffer picking method might have set a 
      // pick matrix that has been multiplied with the projection matrix.
      // This is the only way to get the gl pick matrix again
Jan Möbius's avatar
Jan Möbius committed
403
404
405
406
407
408
409
410
411
412
413
414
415
416
      glMatrixMode(GL_PROJECTION);

      glPushMatrix ();
      glMultMatrixd( _state.inverse_projection().get_raw_data());

      glGetDoublev(GL_PROJECTION_MATRIX, mat);

      GLMatrixd pickMat (mat);

      // add our matrix
      gluPerspective(45.0, _state.aspect(), 0.8, 20.0);

      glMatrixMode(GL_MODELVIEW);

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
417
418
      // reset scene translation
      GLMatrixd modelview = _state.modelview();
Jan Möbius's avatar
 
Jan Möbius committed
419

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
420
421
422
      modelview(0,3) = 0.0;
      modelview(1,3) = 0.0;
      modelview(2,3) = 0.0;
Jan Möbius's avatar
 
Jan Möbius committed
423

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
424
425
      _state.set_modelview (modelview);
      _state.translate (pos3D[0], pos3D[1], pos3D[2]-0.3, MULT_FROM_LEFT);
Jan Möbius's avatar
 
Jan Möbius committed
426

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
427
      // clear depth buffer behind coordsys node
428
      clearPickArea(_state, pickMat, true, 1.0);
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
429

Jan Möbius's avatar
Jan Möbius committed
430
431
432
      // Koordinatensystem zeichnen
      drawCoordsysPick(_state);

433
434
435
      // set depth buffer to 0.0 so that nothing can paint above
      clearPickArea(_state, pickMat, false, 0.0);

Jan Möbius's avatar
Jan Möbius committed
436
437
438
      glMatrixMode(GL_PROJECTION);
      glPopMatrix ();
      glMatrixMode(GL_MODELVIEW);
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
439

Jan Möbius's avatar
Jan Möbius committed
440
441
    } else if (mode_ == POSITION) { /* mode_ == POSITION */

442
443
444
      // The selection buffer picking method might have set a 
      // pick matrix that has been multiplied with the projection matrix.
      // This is the only way to get the gl pick matrix again
Jan Möbius's avatar
Jan Möbius committed
445
446
447
448
449
450
451
452
453
454
455
456
457
      glMatrixMode(GL_PROJECTION);

      glPushMatrix ();
      glMultMatrixd( _state.inverse_projection().get_raw_data());

      glGetDoublev(GL_PROJECTION_MATRIX, mat);

      glPopMatrix ();

      GLMatrixd pickMat (mat);

      glMatrixMode(GL_MODELVIEW);

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
458
459
460
461
462
463
      GLMatrixd modelview = _state.modelview();

      modelview(0,3) = 0.0;
      modelview(1,3) = 0.0;
      modelview(2,3) = 0.0;

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
464
      // clear depth buffer behind coordsys node
465
466
467
      clearPickArea(_state, pickMat, true, 1.0);

      // Koordinatensystem zeichnen
Jan Möbius's avatar
Jan Möbius committed
468
      drawCoordsysPick(_state);
469
470
471

      // set depth buffer to 0.0 so that nothing can paint above
      clearPickArea(_state, pickMat, false, 0.0);
Jan Möbius's avatar
 
Jan Möbius committed
472
    }
Jan Möbius's avatar
Jan Möbius committed
473
474
475
476
    // Reload old configuration
    _state.pop_modelview_matrix();

  }
Jan Möbius's avatar
 
Jan Möbius committed
477
478
}

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
479
480
//----------------------------------------------------------------------------

481
void CoordsysNode::clearPickArea(GLState&  _state, GLMatrixd _pickMatrix, bool _draw, GLfloat _depth)
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
482
483
484
485
486
487
488
489
{
  std::vector<Vec2f> points;
  Vec2f center;
  float radius;

  int left, bottom, width, height;
  _state.get_viewport(left, bottom, width, height);

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
490
491
492
  GLboolean colorMask[4];
  glGetBooleanv (GL_COLOR_WRITEMASK, colorMask);

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
  GLUquadricObj *quadric = gluNewQuadric();

  // respect sphere radius
  Vec3d proj = _state.project (Vec3d (-0.01, -0.01, -0.01));
  points.push_back (Vec2f (proj[0], proj[1]));

  proj = _state.project (Vec3d (0.1, 0.0, 0.0));
  points.push_back (Vec2f (proj[0], proj[1]));

  proj = _state.project (Vec3d (0.0, 0.1, 0.0));
  points.push_back (Vec2f (proj[0], proj[1]));

  proj = _state.project (Vec3d (0.0, 0.0, 0.1));
  points.push_back (Vec2f (proj[0], proj[1]));


  // get bounding circle of projected 4 points of the coord node
  boundingCircle(points, center, radius);

  _state.push_projection_matrix();
  _state.reset_projection();
Jan Möbius's avatar
Jan Möbius committed
514

515
516
  glMatrixMode(GL_PROJECTION);
  glPushMatrix ();
517
518
  // Use the pick matrix to make selection buffer based picking work
  // with our own orthogonal projection
519
520
  glMultMatrixd(_pickMatrix.get_raw_data());
  glMatrixMode(GL_MODELVIEW);
Jan Möbius's avatar
Jan Möbius committed
521

Jan Möbius's avatar
Dennis:    
Jan Möbius committed
522
523
524
525
526
  _state.ortho (left, left + width, bottom, bottom + height, 0.0, 1.0);

  _state.push_modelview_matrix();
  _state.reset_modelview();
  glDepthFunc (GL_ALWAYS);
527
528
  glDepthRange (_depth, _depth);
  _state.translate (center[0], center[1], -0.5);
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
529

530
  if (_draw)
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
531
532
533
534
535
536
537
538
539
540
541
    _state.pick_set_name (0);
  else
    glColorMask(false, false, false, false);

  // 10% more to ensure everything is in
  gluDisk( quadric, 0, radius * 1.1, 10, 10 );

  glDepthFunc (GL_LESS);
  _state.pop_modelview_matrix();
  _state.pop_projection_matrix();

542
543
544
  glDepthRange (0.0, 1.0);

  if (!_draw)
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
545
    glColorMask (colorMask[0], colorMask[1], colorMask[2], colorMask[3]);
546
547
548
549

  glMatrixMode(GL_PROJECTION);
  glPopMatrix ();
  glMatrixMode(GL_MODELVIEW);
Jan Möbius's avatar
Dennis:    
Jan Möbius committed
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

  gluDeleteQuadric(quadric);
}

//----------------------------------------------------------------------------

void CoordsysNode::boundingCircle(std::vector<Vec2f> &_in, Vec2f &_center, float &_radius)
{
  if (_in.size () == 0)
    return;
  if (_in.size () < 2)
  {
    _center = _in[0];
    _radius = 0.0f;
    return;
  }
  bool found = false;

  // try all circumcircles of all possible lines
  for (unsigned int i = 0; i < _in.size () - 1; i++)
    for (unsigned int j = i + 1; j < _in.size (); j++)
    {
      Vec2f cen = (_in[i] + _in[j]) * 0.5;
      float rad = (_in[i] - cen).length ();
      bool allin = true;

      for (unsigned int k = 0; k < _in.size (); k++)
        if (k != i && k != j && (_in[k] - cen).length () > rad)
        {
          allin = false;
          break;
        }

      if (!allin)
        continue;

      if (found)
      {
        if (rad < _radius)
        {
          _center = cen;
          _radius = rad;
        }
      }
      else
      {
        found = true;
        _center = cen;
        _radius = rad;
      }
    }

  if (found)
    return;

  // try all circumcircles of all possible triangles
  for (unsigned int i = 0; i < _in.size () - 2; i++)
    for (unsigned int j = i + 1; j < _in.size () - 1; j++)
      for (unsigned int k = j + 1; k < _in.size (); k++)
      {
        float v = ((_in[k][0]-_in[j][0])*((_in[i][0]*_in[i][0])+(_in[i][1]*_in[i][1]))) +
                  ((_in[i][0]-_in[k][0])*((_in[j][0]*_in[j][0])+(_in[j][1]*_in[j][1]))) +
                  ((_in[j][0]-_in[i][0])*((_in[k][0]*_in[k][0])+(_in[k][1]*_in[k][1])));
        float u = ((_in[j][1]-_in[k][1])*((_in[i][0]*_in[i][0])+(_in[i][1]*_in[i][1]))) +
                  ((_in[k][1]-_in[i][1])*((_in[j][0]*_in[j][0])+(_in[j][1]*_in[j][1]))) +
                  ((_in[i][1]-_in[j][1])*((_in[k][0]*_in[k][0])+(_in[k][1]*_in[k][1])));
        float d = (_in[i][0]*_in[j][1])+(_in[j][0]*_in[k][1])+(_in[k][0]*_in[i][1]) -
                  (_in[i][0]*_in[k][1])-(_in[j][0]*_in[i][1])-(_in[k][0]*_in[j][1]);
        Vec2f cen(0.5 * (u/d), 0.5 * (v/d));
        float rad = (_in[i] - cen).length ();
        bool allin = true;

        for (unsigned int l = 0; l < _in.size (); l++)
          if (l != i && l != j && l != k && (_in[l] - cen).length () > rad)
          {
            allin = false;
            break;
          }

        if (!allin)
          continue;

        if (found)
        {
          if (rad < _radius)
          {
            _center = cen;
            _radius = rad;
          }
        }
        else
        {
          found = true;
          _center = cen;
          _radius = rad;
        }
      }
}

Jan Möbius's avatar
 
Jan Möbius committed
649
650
651
652
//=============================================================================
} // namespace SceneGraph
} // namespace ACG
//=============================================================================