samples/opengl/penguin/dxfrenderer.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dxfrenderer.cpp
   3 // Purpose:     DXF reader and renderer
   4 // Author:      Sandro Sigala
   5 // Modified by:
   6 // Created:     2005-11-10
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Sandro Sigala
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx/wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16 #pragma hdrstop
  17 #endif
  18
  19 #ifndef WX_PRECOMP
  20 #include "wx/wx.h"
  21 #endif
  22
  23 #include "wx/wfstream.h"
  24 #include "wx/txtstrm.h"
  25
  26 #if !wxUSE_GLCANVAS
  27     #error "OpenGL required: set wxUSE_GLCANVAS to 1 and rebuild the library"
  28 #endif
  29
  30 #ifdef __DARWIN__
  31     #include <OpenGL/glu.h>
  32 #else
  33     #include <GL/glu.h>
  34 #endif
  35
  36 #include "dxfrenderer.h"
  37
  38 #include "wx/listimpl.cpp"
  39 WX_DEFINE_LIST(DXFEntityList)
  40 WX_DEFINE_LIST(DXFLayerList)
  41
  42 // Conversion table from AutoCAD ACI colours to RGB values
  43 static const struct { unsigned char r, g, b; } aci_to_rgb[256] = {
  44 /*   0 */ {255, 255, 255},
  45 /*   1 */ {255,   0,   0},
  46 /*   2 */ {255, 255,   0},
  47 /*   3 */ {  0, 255,   0},
  48 /*   4 */ {  0, 255, 255},
  49 /*   5 */ {  0,   0, 255},
  50 /*   6 */ {255,   0, 255},
  51 /*   7 */ {255, 255, 255},
  52 /*   8 */ {128, 128, 128},
  53 /*   9 */ {192, 192, 192},
  54 /*  10 */ {255,   0,   0},
  55 /*  11 */ {255, 127, 127},
  56 /*  12 */ {204,   0,   0},
  57 /*  13 */ {204, 102, 102},
  58 /*  14 */ {153,   0,   0},
  59 /*  15 */ {153,  76,  76},
  60 /*  16 */ {127,   0,   0},
  61 /*  17 */ {127,  63,  63},
  62 /*  18 */ { 76,   0,   0},
  63 /*  19 */ { 76,  38,  38},
  64 /*  20 */ {255,  63,   0},
  65 /*  21 */ {255, 159, 127},
  66 /*  22 */ {204,  51,   0},
  67 /*  23 */ {204, 127, 102},
  68 /*  24 */ {153,  38,   0},
  69 /*  25 */ {153,  95,  76},
  70 /*  26 */ {127,  31,   0},
  71 /*  27 */ {127,  79,  63},
  72 /*  28 */ { 76,  19,   0},
  73 /*  29 */ { 76,  47,  38},
  74 /*  30 */ {255, 127,   0},
  75 /*  31 */ {255, 191, 127},
  76 /*  32 */ {204, 102,   0},
  77 /*  33 */ {204, 153, 102},
  78 /*  34 */ {153,  76,   0},
  79 /*  35 */ {153, 114,  76},
  80 /*  36 */ {127,  63,   0},
  81 /*  37 */ {127,  95,  63},
  82 /*  38 */ { 76,  38,   0},
  83 /*  39 */ { 76,  57,  38},
  84 /*  40 */ {255, 191,   0},
  85 /*  41 */ {255, 223, 127},
  86 /*  42 */ {204, 153,   0},
  87 /*  43 */ {204, 178, 102},
  88 /*  44 */ {153, 114,   0},
  89 /*  45 */ {153, 133,  76},
  90 /*  46 */ {127,  95,   0},
  91 /*  47 */ {127, 111,  63},
  92 /*  48 */ { 76,  57,   0},
  93 /*  49 */ { 76,  66,  38},
  94 /*  50 */ {255, 255,   0},
  95 /*  51 */ {255, 255, 127},
  96 /*  52 */ {204, 204,   0},
  97 /*  53 */ {204, 204, 102},
  98 /*  54 */ {153, 153,   0},
  99 /*  55 */ {153, 153,  76},
 100 /*  56 */ {127, 127,   0},
 101 /*  57 */ {127, 127,  63},
 102 /*  58 */ { 76,  76,   0},
 103 /*  59 */ { 76,  76,  38},
 104 /*  60 */ {191, 255,   0},
 105 /*  61 */ {223, 255, 127},
 106 /*  62 */ {153, 204,   0},
 107 /*  63 */ {178, 204, 102},
 108 /*  64 */ {114, 153,   0},
 109 /*  65 */ {133, 153,  76},
 110 /*  66 */ { 95, 127,   0},
 111 /*  67 */ {111, 127,  63},
 112 /*  68 */ { 57,  76,   0},
 113 /*  69 */ { 66,  76,  38},
 114 /*  70 */ {127, 255,   0},
 115 /*  71 */ {191, 255, 127},
 116 /*  72 */ {102, 204,   0},
 117 /*  73 */ {153, 204, 102},
 118 /*  74 */ { 76, 153,   0},
 119 /*  75 */ {114, 153,  76},
 120 /*  76 */ { 63, 127,   0},
 121 /*  77 */ { 95, 127,  63},
 122 /*  78 */ { 38,  76,   0},
 123 /*  79 */ { 57,  76,  38},
 124 /*  80 */ { 63, 255,   0},
 125 /*  81 */ {159, 255, 127},
 126 /*  82 */ { 51, 204,   0},
 127 /*  83 */ {127, 204, 102},
 128 /*  84 */ { 38, 153,   0},
 129 /*  85 */ { 95, 153,  76},
 130 /*  86 */ { 31, 127,   0},
 131 /*  87 */ { 79, 127,  63},
 132 /*  88 */ { 19,  76,   0},
 133 /*  89 */ { 47,  76,  38},
 134 /*  90 */ {  0, 255,   0},
 135 /*  91 */ {127, 255, 127},
 136 /*  92 */ {  0, 204,   0},
 137 /*  93 */ {102, 204, 102},
 138 /*  94 */ {  0, 153,   0},
 139 /*  95 */ { 76, 153,  76},
 140 /*  96 */ {  0, 127,   0},
 141 /*  97 */ { 63, 127,  63},
 142 /*  98 */ {  0,  76,   0},
 143 /*  99 */ { 38,  76,  38},
 144 /* 100 */ {  0, 255,  63},
 145 /* 101 */ {127, 255, 159},
 146 /* 102 */ {  0, 204,  51},
 147 /* 103 */ {102, 204, 127},
 148 /* 104 */ {  0, 153,  38},
 149 /* 105 */ { 76, 153,  95},
 150 /* 106 */ {  0, 127,  31},
 151 /* 107 */ { 63, 127,  79},
 152 /* 108 */ {  0,  76,  19},
 153 /* 109 */ { 38,  76,  47},
 154 /* 110 */ {  0, 255, 127},
 155 /* 111 */ {127, 255, 191},
 156 /* 112 */ {  0, 204, 102},
 157 /* 113 */ {102, 204, 153},
 158 /* 114 */ {  0, 153,  76},
 159 /* 115 */ { 76, 153, 114},
 160 /* 116 */ {  0, 127,  63},
 161 /* 117 */ { 63, 127,  95},
 162 /* 118 */ {  0,  76,  38},
 163 /* 119 */ { 38,  76,  57},
 164 /* 120 */ {  0, 255, 191},
 165 /* 121 */ {127, 255, 223},
 166 /* 122 */ {  0, 204, 153},
 167 /* 123 */ {102, 204, 178},
 168 /* 124 */ {  0, 153, 114},
 169 /* 125 */ { 76, 153, 133},
 170 /* 126 */ {  0, 127,  95},
 171 /* 127 */ { 63, 127, 111},
 172 /* 128 */ {  0,  76,  57},
 173 /* 129 */ { 38,  76,  66},
 174 /* 130 */ {  0, 255, 255},
 175 /* 131 */ {127, 255, 255},
 176 /* 132 */ {  0, 204, 204},
 177 /* 133 */ {102, 204, 204},
 178 /* 134 */ {  0, 153, 153},
 179 /* 135 */ { 76, 153, 153},
 180 /* 136 */ {  0, 127, 127},
 181 /* 137 */ { 63, 127, 127},
 182 /* 138 */ {  0,  76,  76},
 183 /* 139 */ { 38,  76,  76},
 184 /* 140 */ {  0, 191, 255},
 185 /* 141 */ {127, 223, 255},
 186 /* 142 */ {  0, 153, 204},
 187 /* 143 */ {102, 178, 204},
 188 /* 144 */ {  0, 114, 153},
 189 /* 145 */ { 76, 133, 153},
 190 /* 146 */ {  0,  95, 127},
 191 /* 147 */ { 63, 111, 127},
 192 /* 148 */ {  0,  57,  76},
 193 /* 149 */ { 38,  66,  76},
 194 /* 150 */ {  0, 127, 255},
 195 /* 151 */ {127, 191, 255},
 196 /* 152 */ {  0, 102, 204},
 197 /* 153 */ {102, 153, 204},
 198 /* 154 */ {  0,  76, 153},
 199 /* 155 */ { 76, 114, 153},
 200 /* 156 */ {  0,  63, 127},
 201 /* 157 */ { 63,  95, 127},
 202 /* 158 */ {  0,  38,  76},
 203 /* 159 */ { 38,  57,  76},
 204 /* 160 */ {  0,  63, 255},
 205 /* 161 */ {127, 159, 255},
 206 /* 162 */ {  0,  51, 204},
 207 /* 163 */ {102, 127, 204},
 208 /* 164 */ {  0,  38, 153},
 209 /* 165 */ { 76,  95, 153},
 210 /* 166 */ {  0,  31, 127},
 211 /* 167 */ { 63,  79, 127},
 212 /* 168 */ {  0,  19,  76},
 213 /* 169 */ { 38,  47,  76},
 214 /* 170 */ {  0,   0, 255},
 215 /* 171 */ {127, 127, 255},
 216 /* 172 */ {  0,   0, 204},
 217 /* 173 */ {102, 102, 204},
 218 /* 174 */ {  0,   0, 153},
 219 /* 175 */ { 76,  76, 153},
 220 /* 176 */ {  0,   0, 127},
 221 /* 177 */ { 63,  63, 127},
 222 /* 178 */ {  0,   0,  76},
 223 /* 179 */ { 38,  38,  76},
 224 /* 180 */ { 63,   0, 255},
 225 /* 181 */ {159, 127, 255},
 226 /* 182 */ { 51,   0, 204},
 227 /* 183 */ {127, 102, 204},
 228 /* 184 */ { 38,   0, 153},
 229 /* 185 */ { 95,  76, 153},
 230 /* 186 */ { 31,   0, 127},
 231 /* 187 */ { 79,  63, 127},
 232 /* 188 */ { 19,   0,  76},
 233 /* 189 */ { 47,  38,  76},
 234 /* 190 */ {127,   0, 255},
 235 /* 191 */ {191, 127, 255},
 236 /* 192 */ {102,   0, 204},
 237 /* 193 */ {153, 102, 204},
 238 /* 194 */ { 76,   0, 153},
 239 /* 195 */ {114,  76, 153},
 240 /* 196 */ { 63,   0, 127},
 241 /* 197 */ { 95,  63, 127},
 242 /* 198 */ { 38,   0,  76},
 243 /* 199 */ { 57,  38,  76},
 244 /* 200 */ {191,   0, 255},
 245 /* 201 */ {223, 127, 255},
 246 /* 202 */ {153,   0, 204},
 247 /* 203 */ {178, 102, 204},
 248 /* 204 */ {114,   0, 153},
 249 /* 205 */ {133,  76, 153},
 250 /* 206 */ { 95,   0, 127},
 251 /* 207 */ {111,  63, 127},
 252 /* 208 */ { 57,   0,  76},
 253 /* 209 */ { 66,  38,  76},
 254 /* 210 */ {255,   0, 255},
 255 /* 211 */ {255, 127, 255},
 256 /* 212 */ {204,   0, 204},
 257 /* 213 */ {204, 102, 204},
 258 /* 214 */ {153,   0, 153},
 259 /* 215 */ {153,  76, 153},
 260 /* 216 */ {127,   0, 127},
 261 /* 217 */ {127,  63, 127},
 262 /* 218 */ { 76,   0,  76},
 263 /* 219 */ { 76,  38,  76},
 264 /* 220 */ {255,   0, 191},
 265 /* 221 */ {255, 127, 223},
 266 /* 222 */ {204,   0, 153},
 267 /* 223 */ {204, 102, 178},
 268 /* 224 */ {153,   0, 114},
 269 /* 225 */ {153,  76, 133},
 270 /* 226 */ {127,   0,  95},
 271 /* 227 */ {127,  63, 111},
 272 /* 228 */ { 76,   0,  57},
 273 /* 229 */ { 76,  38,  66},
 274 /* 230 */ {255,   0, 127},
 275 /* 231 */ {255, 127, 191},
 276 /* 232 */ {204,   0, 102},
 277 /* 233 */ {204, 102, 153},
 278 /* 234 */ {153,   0,  76},
 279 /* 235 */ {153,  76, 114},
 280 /* 236 */ {127,   0,  63},
 281 /* 237 */ {127,  63,  95},
 282 /* 238 */ { 76,   0,  38},
 283 /* 239 */ { 76,  38,  57},
 284 /* 240 */ {255,   0,  63},
 285 /* 241 */ {255, 127, 159},
 286 /* 242 */ {204,   0,  51},
 287 /* 243 */ {204, 102, 127},
 288 /* 244 */ {153,   0,  38},
 289 /* 245 */ {153,  76,  95},
 290 /* 246 */ {127,   0,  31},
 291 /* 247 */ {127,  63,  79},
 292 /* 248 */ { 76,   0,  19},
 293 /* 249 */ { 76,  38,  47},
 294 /* 250 */ { 51,  51,  51},
 295 /* 251 */ { 91,  91,  91},
 296 /* 252 */ {132, 132, 132},
 297 /* 253 */ {173, 173, 173},
 298 /* 254 */ {214, 214, 214},
 299 /* 255 */ {255, 255, 255}
 300 };
 301
 302 inline DXFVector Cross(const DXFVector& v1, const DXFVector& v2)
 303 {
 304     return DXFVector(v1.y*v2.z - v1.z*v2.y, v1.z*v2.x - v1.x*v2.z, v1.x*v2.y - v1.y*v2.x);
 305 }
 306
 307 void DXFFace::CalculateNormal()
 308 {
 309     DXFVector v01, v02;
 310     v01.x = v0.x - v1.x;
 311     v01.y = v0.y - v1.y;
 312     v01.z = v0.z - v1.z;
 313     v02.x = v0.x - v2.x;
 314     v02.y = v0.y - v2.y;
 315     v02.z = v0.z - v2.z;
 316     n = Cross(v01, v02);
 317     float mod = sqrt(n.x*n.x + n.y*n.y + n.z*n.z);
 318     n.x /= mod;
 319     n.y /= mod;
 320     n.z /= mod;
 321 }
 322
 323 // convert an AutoCAD ACI colour to wxWidgets RGB colour
 324 inline wxColour ACIColourToRGB(int col)
 325 {
 326     wxASSERT(col >= 0 && col <= 255);
 327     return wxColour(aci_to_rgb[col].r, aci_to_rgb[col].g, aci_to_rgb[col].b);
 328 }
 329
 330 // DXFReader constructor
 331 DXFRenderer::DXFRenderer()
 332 {
 333     m_loaded = false;
 334 }
 335
 336 // DXFReader destructor
 337 DXFRenderer::~DXFRenderer()
 338 {
 339     Clear();
 340 }
 341
 342 // deallocate all the dynamic data
 343 void DXFRenderer::Clear()
 344 {
 345     m_loaded = false;
 346     {
 347         for (DXFLayerList::compatibility_iterator node = m_layers.GetFirst(); node; node = node->GetNext())
 348         {
 349             DXFLayer *current = node->GetData();
 350             delete current;
 351         }
 352     }
 353     m_layers.Clear();
 354     {
 355         for (DXFEntityList::compatibility_iterator node = m_entities.GetFirst(); node; node = node->GetNext())
 356         {
 357             DXFEntity *current = node->GetData();
 358             delete current;
 359         }
 360         m_entities.Clear();
 361     }
 362 }
 363
 364 int DXFRenderer::GetLayerColour(const wxString& layer) const
 365 {
 366     for (DXFLayerList::compatibility_iterator node = m_layers.GetFirst(); node; node = node->GetNext())
 367     {
 368         DXFLayer *current = node->GetData();
 369         if (current->name == layer)
 370             return current->colour;
 371     }
 372     return 7;   // white
 373 }
 374
 375 // read two sequential lines
 376 inline void GetLines(wxTextInputStream& text, wxString& line1, wxString& line2)
 377 {
 378     line1 = text.ReadLine().Trim().Trim(false);
 379     line2 = text.ReadLine().Trim().Trim(false);
 380 }
 381
 382 // parse header section: just skip everything
 383 bool DXFRenderer::ParseHeader(wxInputStream& stream)
 384 {
 385     wxTextInputStream text(stream);
 386     wxString line1, line2;
 387     while (stream.CanRead())
 388     {
 389         GetLines(text, line1, line2);
 390         if (line1 == wxT("0") && line2 == wxT("ENDSEC"))
 391             return true;
 392     }
 393     return false;
 394 }
 395
 396 // parse tables section: save layers name and colour
 397 bool DXFRenderer::ParseTables(wxInputStream& stream)
 398 {
 399     wxTextInputStream text(stream);
 400     wxString line1, line2;
 401     bool inlayer=false;
 402     DXFLayer layer;
 403     while (stream.CanRead())
 404     {
 405         GetLines(text, line1, line2);
 406         if (line1 == wxT("0") && inlayer)
 407         {
 408             // flush layer
 409             if (!layer.name.IsEmpty() && layer.colour != -1)
 410             {
 411                 DXFLayer *p = new DXFLayer;
 412                 p->name = layer.name;
 413                 p->colour = layer.colour;
 414                 m_layers.Append(p);
 415             }
 416             layer = DXFLayer();
 417             inlayer = false;
 418         }
 419         if (line1 == wxT("0") && line2 == wxT("ENDSEC"))
 420             return true;
 421         else if (line1 == wxT("0") && line2 == wxT("LAYER"))
 422             inlayer = true;
 423         else if (inlayer)
 424         {
 425             if (line1 == wxT("2")) // layer name
 426                 layer.name = line2;
 427             else if (line1 == wxT("62")) // ACI colour
 428             {
 429                 long l;
 430                 line2.ToLong(&l);
 431                 layer.colour = l;
 432             }
 433         }
 434     }
 435     return false;
 436 }
 437
 438 // parse entities section: save 3DFACE and LINE entities
 439 bool DXFRenderer::ParseEntities(wxInputStream& stream)
 440 {
 441     wxTextInputStream text(stream);
 442     wxString line1, line2;
 443     int state = 0;  // 0: none, 1: 3DFACE, 2: LINE
 444     DXFVector v[4];
 445     int colour = -1;
 446     wxString layer;
 447     while (stream.CanRead())
 448     {
 449         GetLines(text, line1, line2);
 450         if (line1 == wxT("0") && state > 0)
 451         {
 452             // flush entity
 453             if (state == 1) // 3DFACE
 454             {
 455                 DXFFace *p = new DXFFace;
 456                 p->v0 = v[0];
 457                 p->v1 = v[1];
 458                 p->v2 = v[2];
 459                 p->v3 = v[3];
 460                 p->CalculateNormal();
 461                 if (colour != -1)
 462                     p->colour = colour;
 463                 else
 464                     p->colour = GetLayerColour(layer);
 465                 m_entities.Append(p);
 466                 colour = -1; layer = wxEmptyString;
 467                 v[0] = v[1] = v[2] = v[3] = DXFVector();
 468                 state = 0;
 469             }
 470             else if (state == 2) // LINE
 471             {
 472                 DXFLine *p = new DXFLine;
 473                 p->v0 = v[0];
 474                 p->v1 = v[1];
 475                 if (colour != -1)
 476                     p->colour = colour;
 477                 else
 478                     p->colour = GetLayerColour(layer);
 479                 m_entities.Append(p);
 480                 colour = -1; layer = wxEmptyString;
 481                 v[0] = v[1] = v[2] = v[3] = DXFVector();
 482                 state = 0;
 483             }
 484         }
 485         if (line1 == wxT("0") && line2 == wxT("ENDSEC"))
 486             return true;
 487         else if (line1 == wxT("0") && line2 == wxT("3DFACE"))
 488             state = 1;
 489         else if (line1 == wxT("0") && line2 == wxT("LINE"))
 490             state = 2;
 491         else if (state > 0)
 492         {
 493             double d;
 494             line2.ToDouble(&d);
 495             if (line1 == wxT("10"))
 496                 v[0].x = d;
 497             else if (line1 == wxT("20"))
 498                 v[0].y = d;
 499             else if (line1 == wxT("30"))
 500                 v[0].z = d;
 501             else if (line1 == wxT("11"))
 502                 v[1].x = d;
 503             else if (line1 == wxT("21"))
 504                 v[1].y = d;
 505             else if (line1 == wxT("31"))
 506                 v[1].z = d;
 507             else if (line1 == wxT("12"))
 508                 v[2].x = d;
 509             else if (line1 == wxT("22"))
 510                 v[2].y = d;
 511             else if (line1 == wxT("32"))
 512                 v[2].z = d;
 513             else if (line1 == wxT("13"))
 514                 v[3].x = d;
 515             else if (line1 == wxT("23"))
 516                 v[3].y = d;
 517             else if (line1 == wxT("33"))
 518                 v[3].z = d;
 519             else if (line1 == wxT("8"))  // layer
 520                 layer = line2;
 521             else if (line1 == wxT("62")) // colour
 522             {
 523                 long l;
 524                 line2.ToLong(&l);
 525                 colour = l;
 526             }
 527         }
 528     }
 529     return false;
 530 }
 531
 532 // parse and load a DXF file
 533 // currently pretty limited, but knows enought do handle 3DFACEs and LINEs
 534 bool DXFRenderer::Load(wxInputStream& stream)
 535 {
 536     Clear();
 537     wxTextInputStream text(stream);
 538
 539     wxString line1, line2;
 540     while (stream.CanRead())
 541     {
 542         GetLines(text, line1, line2);
 543         if (line1 == wxT("999")) // comment
 544             continue;
 545         else if (line1 == wxT("0") && line2 == wxT("SECTION"))
 546         {
 547             GetLines(text, line1, line2);
 548             if (line1 == wxT("2"))
 549             {
 550                 if (line2 == wxT("HEADER"))
 551                 {
 552                     if (!ParseHeader(stream))
 553                         return false;
 554                 }
 555                 else if (line2 == wxT("TABLES"))
 556                 {
 557                     if (!ParseTables(stream))
 558                         return false;
 559                 }
 560                 else if (line2 == wxT("ENTITIES"))
 561                 {
 562                     if (!ParseEntities(stream))
 563                         return false;
 564                 }
 565             }
 566         }
 567     }
 568
 569     NormalizeEntities();
 570     m_loaded = true;
 571     return true;
 572 }
 573
 574 inline float mymin(float x, float y) { return x < y ? x : y; }
 575 inline float mymax(float x, float y) { return x > y ? x : y; }
 576
 577 // Scale object boundings to [-5,5]
 578 void DXFRenderer::NormalizeEntities()
 579 {
 580     // calculate current min and max boundings of object
 581     DXFVector minv(10e20f, 10e20f, 10e20f);
 582     DXFVector maxv(-10e20f, -10e20f, -10e20f);
 583     for (DXFEntityList::compatibility_iterator node = m_entities.GetFirst(); node; node = node->GetNext())
 584     {
 585         DXFEntity *p = node->GetData();
 586         if (p->type == DXFEntity::Line)
 587         {
 588             DXFLine *line = (DXFLine *)p;
 589             const DXFVector *v[2] = { &line->v0, &line->v1 };
 590             for (int i = 0; i < 2; ++i)
 591             {
 592                 minv.x = mymin(v[i]->x, minv.x);
 593                 minv.y = mymin(v[i]->y, minv.y);
 594                 minv.z = mymin(v[i]->z, minv.z);
 595                 maxv.x = mymax(v[i]->x, maxv.x);
 596                 maxv.y = mymax(v[i]->y, maxv.y);
 597                 maxv.z = mymax(v[i]->z, maxv.z);
 598             }
 599         } else if (p->type == DXFEntity::Face)
 600         {
 601             DXFFace *face = (DXFFace *)p;
 602             const DXFVector *v[4] = { &face->v0, &face->v1, &face->v2, &face->v3 };
 603             for (int i = 0; i < 4; ++i)
 604             {
 605                 minv.x = mymin(v[i]->x, minv.x);
 606                 minv.y = mymin(v[i]->y, minv.y);
 607                 minv.z = mymin(v[i]->z, minv.z);
 608                 maxv.x = mymax(v[i]->x, maxv.x);
 609                 maxv.y = mymax(v[i]->y, maxv.y);
 610                 maxv.z = mymax(v[i]->z, maxv.z);
 611             }
 612        }
 613     }
 614
 615     // rescale object down to [-5,5]
 616     DXFVector span(maxv.x - minv.x, maxv.y - minv.y, maxv.z - minv.z);
 617     float factor = mymin(mymin(10.0f / span.x, 10.0f / span.y), 10.0f / span.z);
 618     for (DXFEntityList::compatibility_iterator node2 = m_entities.GetFirst(); node2; node2 = node2->GetNext())
 619     {
 620         DXFEntity *p = node2->GetData();
 621         if (p->type == DXFEntity::Line)
 622         {
 623             DXFLine *line = (DXFLine *)p;
 624             DXFVector *v[2] = { &line->v0, &line->v1 };
 625             for (int i = 0; i < 2; ++i)
 626             {
 627                 v[i]->x -= minv.x + span.x/2; v[i]->x *= factor;
 628                 v[i]->y -= minv.y + span.y/2; v[i]->y *= factor;
 629                 v[i]->z -= minv.z + span.z/2; v[i]->z *= factor;
 630             }
 631         } else if (p->type == DXFEntity::Face)
 632         {
 633             DXFFace *face = (DXFFace *)p;
 634             DXFVector *v[4] = { &face->v0, &face->v1, &face->v2, &face->v3 };
 635             for (int i = 0; i < 4; ++i)
 636             {
 637                 v[i]->x -= minv.x + span.x/2; v[i]->x *= factor;
 638                 v[i]->y -= minv.y + span.y/2; v[i]->y *= factor;
 639                 v[i]->z -= minv.z + span.z/2; v[i]->z *= factor;
 640             }
 641        }
 642     }
 643 }
 644
 645 // OpenGL renderer for DXF entities
 646 void DXFRenderer::Render() const
 647 {
 648     if (!m_loaded)
 649         return;
 650
 651     for (DXFEntityList::compatibility_iterator node = m_entities.GetFirst(); node; node = node->GetNext())
 652     {
 653         DXFEntity *p = node->GetData();
 654         wxColour c = ACIColourToRGB(p->colour);
 655         if (p->type == DXFEntity::Line)
 656         {
 657             DXFLine *line = (DXFLine *)p;
 658             glBegin(GL_LINES);
 659             glColor3f(c.Red()/255.0,c.Green()/255.0,c.Blue()/255.0);
 660             glVertex3f(line->v0.x, line->v0.y, line->v0.z);
 661             glVertex3f(line->v1.x, line->v1.y, line->v1.z);
 662             glEnd();
 663         }
 664         else if (p->type == DXFEntity::Face)
 665         {
 666             DXFFace *face = (DXFFace *)p;
 667             glBegin(GL_TRIANGLES);
 668             glColor3f(c.Red()/255.0,c.Green()/255.0,c.Blue()/255.0);
 669             glNormal3f(face->n.x, face->n.y, face->n.z);
 670             glVertex3f(face->v0.x, face->v0.y, face->v0.z);
 671             glVertex3f(face->v1.x, face->v1.y, face->v1.z);
 672             glVertex3f(face->v2.x, face->v2.y, face->v2.z);
 673             glEnd();
 674         }
 675     }
 676 }