CoordsysNode.cc 18.2 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

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
248 249
    pos3D = _state.unproject (Vec3d (posx, posy, 0.5));
    _state.pop_modelview_matrix();
Jan Möbius's avatar
 
Jan Möbius committed
250

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
251 252
    // reset scene translation
    GLMatrixd modelview = _state.modelview();
Jan Möbius's avatar
 
Jan Möbius committed
253

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
254 255 256
    modelview(0,3) = 0.0;
    modelview(1,3) = 0.0;
    modelview(2,3) = 0.0;
Jan Möbius's avatar
 
Jan Möbius committed
257

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
258 259
    _state.set_modelview (modelview);
    _state.translate (pos3D[0], pos3D[1], pos3D[2]-0.3, MULT_FROM_LEFT);
Jan Möbius's avatar
 
Jan Möbius committed
260

261 262 263 264 265
    glDepthRange (1.0, 1.0);
    glDepthFunc (GL_ALWAYS);

    // Koordinatensystem zeichnen
    drawCoordsys(_state);
266

267 268
    glDepthRange (0.0, 1.0);
    glDepthFunc (GL_LESS);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
269

Jan Möbius's avatar
 
Jan Möbius committed
270 271 272
    // Koordinatensystem zeichnen
    drawCoordsys(_state);

273 274 275 276
    // 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);
277

278 279 280 281 282
    // Koordinatensystem zeichnen
    drawCoordsys(_state);

    glDepthRange (0.0, 1.0);
    glDepthFunc (GL_LESS);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
283
    glColorMask (colorMask[0], colorMask[1], colorMask[2], colorMask[3]);
284

Jan Möbius's avatar
 
Jan Möbius committed
285 286
    // Projection reload
    _state.pop_projection_matrix();
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
287

Jan Möbius's avatar
 
Jan Möbius committed
288 289 290

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

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
291 292 293 294 295 296 297
    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
298

299 300 301 302 303 304 305 306 307 308
    // 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);
309

310
    // Koordinatensystem zeichnen
Jan Möbius's avatar
 
Jan Möbius committed
311 312
    drawCoordsys(_state);

313 314 315 316 317 318 319
    // 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);
320

321 322 323
    // reset to default
    glDepthRange (0.0, 1.0);
    glDepthFunc (GL_LESS);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
324
    glColorMask (colorMask[0], colorMask[1], colorMask[2], colorMask[3]);
325

Jan Möbius's avatar
 
Jan Möbius committed
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
  }

  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
361 362
  if (_target == PICK_ANYTHING) {

Jan Möbius's avatar
Jan Möbius committed
363 364
    GLdouble mat[16];

Jan Möbius's avatar
 
Jan Möbius committed
365
    // Push Modelview-Matrix
Jan Möbius's avatar
Jan Möbius committed
366
    _state.push_modelview_matrix();
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
367
    _state.pick_set_maximum (5);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
368
    _state.pick_set_name (0);
Jan Möbius's avatar
 
Jan Möbius committed
369 370

    // Init state - changes when mode_ != POSITION
Jan Möbius's avatar
Jan Möbius committed
371
    Vec3d pos3D(0.0,0.0,0.0);
Jan Möbius's avatar
 
Jan Möbius committed
372

Jan Möbius's avatar
Jan Möbius committed
373
    if ( mode_ == SCREENPOS ) {
Jan Möbius's avatar
 
Jan Möbius committed
374

Jan Möbius's avatar
Jan Möbius committed
375 376
      int left, bottom, width, height;
      _state.get_viewport(left, bottom, width, height);
Jan Möbius's avatar
 
Jan Möbius committed
377

Jan Möbius's avatar
Jan Möbius committed
378 379
      // Projection reset
      _state.push_projection_matrix();
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
380 381
      _state.reset_projection();
      _state.perspective(45.0, _state.aspect(), 0.8, 20.0);
Jan Möbius's avatar
 
Jan Möbius committed
382

Jan Möbius's avatar
Jan Möbius committed
383 384
      float posx = left + width - 30.0 ;
      float posy = bottom + height - 30.0 ;
Jan Möbius's avatar
 
Jan Möbius committed
385

Jan Möbius's avatar
Jan Möbius committed
386
      Vec3d screenposCenterPoint( posx , posy , 0.0);
Jan Möbius's avatar
 
Jan Möbius committed
387

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
388 389
      _state.push_modelview_matrix();
      _state.reset_modelview();
Jan Möbius's avatar
 
Jan Möbius committed
390

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
391 392
      pos3D = _state.unproject (Vec3d (posx, posy, 0.5));
      _state.pop_modelview_matrix();
Jan Möbius's avatar
 
Jan Möbius committed
393

Jan Möbius's avatar
Jan Möbius committed
394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411
      // Projection reload
      _state.pop_projection_matrix();

      // the only way to get the gl pick matrix again
      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
412 413
      // reset scene translation
      GLMatrixd modelview = _state.modelview();
Jan Möbius's avatar
 
Jan Möbius committed
414

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
415 416 417
      modelview(0,3) = 0.0;
      modelview(1,3) = 0.0;
      modelview(2,3) = 0.0;
Jan Möbius's avatar
 
Jan Möbius committed
418

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
419 420
      _state.set_modelview (modelview);
      _state.translate (pos3D[0], pos3D[1], pos3D[2]-0.3, MULT_FROM_LEFT);
Jan Möbius's avatar
 
Jan Möbius committed
421

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
422
      // clear depth buffer behind coordsys node
423
      clearPickArea(_state, pickMat, true, 1.0);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
424

Jan Möbius's avatar
Jan Möbius committed
425 426 427
      // Koordinatensystem zeichnen
      drawCoordsysPick(_state);

428 429 430
      // 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
431 432 433
      glMatrixMode(GL_PROJECTION);
      glPopMatrix ();
      glMatrixMode(GL_MODELVIEW);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
434

Jan Möbius's avatar
Jan Möbius committed
435 436
    } else if (mode_ == POSITION) { /* mode_ == POSITION */

Jan Möbius's avatar
Jan Möbius committed
437 438 439 440 441 442 443 444 445 446 447 448 449
      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
450 451 452 453 454 455
      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
456
      // clear depth buffer behind coordsys node
457 458 459
      clearPickArea(_state, pickMat, true, 1.0);

      // Koordinatensystem zeichnen
Jan Möbius's avatar
Jan Möbius committed
460
      drawCoordsysPick(_state);
461 462 463

      // 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
464
    }
Jan Möbius's avatar
Jan Möbius committed
465 466 467 468
    // Reload old configuration
    _state.pop_modelview_matrix();

  }
Jan Möbius's avatar
 
Jan Möbius committed
469 470
}

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
471 472
//----------------------------------------------------------------------------

473
void CoordsysNode::clearPickArea(GLState&  _state, GLMatrixd _pickMatrix, bool _draw, GLfloat _depth)
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
474 475 476 477 478 479 480 481
{
  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
482 483 484
  GLboolean colorMask[4];
  glGetBooleanv (GL_COLOR_WRITEMASK, colorMask);

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505
  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
506

507 508 509 510
  glMatrixMode(GL_PROJECTION);
  glPushMatrix ();
  glMultMatrixd(_pickMatrix.get_raw_data());
  glMatrixMode(GL_MODELVIEW);
Jan Möbius's avatar
Jan Möbius committed
511

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
512 513 514 515 516
  _state.ortho (left, left + width, bottom, bottom + height, 0.0, 1.0);

  _state.push_modelview_matrix();
  _state.reset_modelview();
  glDepthFunc (GL_ALWAYS);
517 518
  glDepthRange (_depth, _depth);
  _state.translate (center[0], center[1], -0.5);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
519

520
  if (_draw)
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
521 522 523 524 525 526 527 528 529 530 531
    _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();

532 533 534
  glDepthRange (0.0, 1.0);

  if (!_draw)
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
535
    glColorMask (colorMask[0], colorMask[1], colorMask[2], colorMask[3]);
536 537 538 539

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

  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
639 640 641 642
//=============================================================================
} // namespace SceneGraph
} // namespace ACG
//=============================================================================