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 // Copyright:   (c) Sandro Sigala
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // For compilers that support precompilation, includes "wx/wx.h".
  12 #include "wx/wxprec.h"
  13
  14 #ifdef __BORLANDC__
  15 #pragma hdrstop
  16 #endif
  17
  18 #ifndef WX_PRECOMP
  19 #include "wx/wx.h"
  20 #endif
  21
  22 #include "wx/wfstream.h"
  23 #include "wx/txtstrm.h"
  24
  25 #if !wxUSE_GLCANVAS
  26     #error "OpenGL required: set wxUSE_GLCANVAS to 1 and rebuild the library"
  27 #endif
  28
  29 #ifdef __DARWIN__
  30     #include <OpenGL/glu.h>
  31 #else
  32     #include <GL/glu.h>
  33 #endif
  34
  35 #include <sstream>
  36
  37 #include "dxfrenderer.h"
  38
  39 #include "wx/listimpl.cpp"
  40 WX_DEFINE_LIST(DXFEntityList)
  41 WX_DEFINE_LIST(DXFLayerList)
  42
  43 // Conversion table from AutoCAD ACI colours to RGB values
  44 static const struct { unsigned char r, g, b; } aci_to_rgb[256] = {
  45 /*   0 */ {255, 255, 255},
  46 /*   1 */ {255,   0,   0},
  47 /*   2 */ {255, 255,   0},
  48 /*   3 */ {  0, 255,   0},
  49 /*   4 */ {  0, 255, 255},
  50 /*   5 */ {  0,   0, 255},
  51 /*   6 */ {255,   0, 255},
  52 /*   7 */ {255, 255, 255},
  53 /*   8 */ {128, 128, 128},
  54 /*   9 */ {192, 192, 192},
  55 /*  10 */ {255,   0,   0},
  56 /*  11 */ {255, 127, 127},
  57 /*  12 */ {204,   0,   0},
  58 /*  13 */ {204, 102, 102},
  59 /*  14 */ {153,   0,   0},
  60 /*  15 */ {153,  76,  76},
  61 /*  16 */ {127,   0,   0},
  62 /*  17 */ {127,  63,  63},
  63 /*  18 */ { 76,   0,   0},
  64 /*  19 */ { 76,  38,  38},
  65 /*  20 */ {255,  63,   0},
  66 /*  21 */ {255, 159, 127},
  67 /*  22 */ {204,  51,   0},
  68 /*  23 */ {204, 127, 102},
  69 /*  24 */ {153,  38,   0},
  70 /*  25 */ {153,  95,  76},
  71 /*  26 */ {127,  31,   0},
  72 /*  27 */ {127,  79,  63},
  73 /*  28 */ { 76,  19,   0},
  74 /*  29 */ { 76,  47,  38},
  75 /*  30 */ {255, 127,   0},
  76 /*  31 */ {255, 191, 127},
  77 /*  32 */ {204, 102,   0},
  78 /*  33 */ {204, 153, 102},
  79 /*  34 */ {153,  76,   0},
  80 /*  35 */ {153, 114,  76},
  81 /*  36 */ {127,  63,   0},
  82 /*  37 */ {127,  95,  63},
  83 /*  38 */ { 76,  38,   0},
  84 /*  39 */ { 76,  57,  38},
  85 /*  40 */ {255, 191,   0},
  86 /*  41 */ {255, 223, 127},
  87 /*  42 */ {204, 153,   0},
  88 /*  43 */ {204, 178, 102},
  89 /*  44 */ {153, 114,   0},
  90 /*  45 */ {153, 133,  76},
  91 /*  46 */ {127,  95,   0},
  92 /*  47 */ {127, 111,  63},
  93 /*  48 */ { 76,  57,   0},
  94 /*  49 */ { 76,  66,  38},
  95 /*  50 */ {255, 255,   0},
  96 /*  51 */ {255, 255, 127},
  97 /*  52 */ {204, 204,   0},
  98 /*  53 */ {204, 204, 102},
  99 /*  54 */ {153, 153,   0},
 100 /*  55 */ {153, 153,  76},
 101 /*  56 */ {127, 127,   0},
 102 /*  57 */ {127, 127,  63},
 103 /*  58 */ { 76,  76,   0},
 104 /*  59 */ { 76,  76,  38},
 105 /*  60 */ {191, 255,   0},
 106 /*  61 */ {223, 255, 127},
 107 /*  62 */ {153, 204,   0},
 108 /*  63 */ {178, 204, 102},
 109 /*  64 */ {114, 153,   0},
 110 /*  65 */ {133, 153,  76},
 111 /*  66 */ { 95, 127,   0},
 112 /*  67 */ {111, 127,  63},
 113 /*  68 */ { 57,  76,   0},
 114 /*  69 */ { 66,  76,  38},
 115 /*  70 */ {127, 255,   0},
 116 /*  71 */ {191, 255, 127},
 117 /*  72 */ {102, 204,   0},
 118 /*  73 */ {153, 204, 102},
 119 /*  74 */ { 76, 153,   0},
 120 /*  75 */ {114, 153,  76},
 121 /*  76 */ { 63, 127,   0},
 122 /*  77 */ { 95, 127,  63},
 123 /*  78 */ { 38,  76,   0},
 124 /*  79 */ { 57,  76,  38},
 125 /*  80 */ { 63, 255,   0},
 126 /*  81 */ {159, 255, 127},
 127 /*  82 */ { 51, 204,   0},
 128 /*  83 */ {127, 204, 102},
 129 /*  84 */ { 38, 153,   0},
 130 /*  85 */ { 95, 153,  76},
 131 /*  86 */ { 31, 127,   0},
 132 /*  87 */ { 79, 127,  63},
 133 /*  88 */ { 19,  76,   0},
 134 /*  89 */ { 47,  76,  38},
 135 /*  90 */ {  0, 255,   0},
 136 /*  91 */ {127, 255, 127},
 137 /*  92 */ {  0, 204,   0},
 138 /*  93 */ {102, 204, 102},
 139 /*  94 */ {  0, 153,   0},
 140 /*  95 */ { 76, 153,  76},
 141 /*  96 */ {  0, 127,   0},
 142 /*  97 */ { 63, 127,  63},
 143 /*  98 */ {  0,  76,   0},
 144 /*  99 */ { 38,  76,  38},
 145 /* 100 */ {  0, 255,  63},
 146 /* 101 */ {127, 255, 159},
 147 /* 102 */ {  0, 204,  51},
 148 /* 103 */ {102, 204, 127},
 149 /* 104 */ {  0, 153,  38},
 150 /* 105 */ { 76, 153,  95},
 151 /* 106 */ {  0, 127,  31},
 152 /* 107 */ { 63, 127,  79},
 153 /* 108 */ {  0,  76,  19},
 154 /* 109 */ { 38,  76,  47},
 155 /* 110 */ {  0, 255, 127},
 156 /* 111 */ {127, 255, 191},
 157 /* 112 */ {  0, 204, 102},
 158 /* 113 */ {102, 204, 153},
 159 /* 114 */ {  0, 153,  76},
 160 /* 115 */ { 76, 153, 114},
 161 /* 116 */ {  0, 127,  63},
 162 /* 117 */ { 63, 127,  95},
 163 /* 118 */ {  0,  76,  38},
 164 /* 119 */ { 38,  76,  57},
 165 /* 120 */ {  0, 255, 191},
 166 /* 121 */ {127, 255, 223},
 167 /* 122 */ {  0, 204, 153},
 168 /* 123 */ {102, 204, 178},
 169 /* 124 */ {  0, 153, 114},
 170 /* 125 */ { 76, 153, 133},
 171 /* 126 */ {  0, 127,  95},
 172 /* 127 */ { 63, 127, 111},
 173 /* 128 */ {  0,  76,  57},
 174 /* 129 */ { 38,  76,  66},
 175 /* 130 */ {  0, 255, 255},
 176 /* 131 */ {127, 255, 255},
 177 /* 132 */ {  0, 204, 204},
 178 /* 133 */ {102, 204, 204},
 179 /* 134 */ {  0, 153, 153},
 180 /* 135 */ { 76, 153, 153},
 181 /* 136 */ {  0, 127, 127},
 182 /* 137 */ { 63, 127, 127},
 183 /* 138 */ {  0,  76,  76},
 184 /* 139 */ { 38,  76,  76},
 185 /* 140 */ {  0, 191, 255},
 186 /* 141 */ {127, 223, 255},
 187 /* 142 */ {  0, 153, 204},
 188 /* 143 */ {102, 178, 204},
 189 /* 144 */ {  0, 114, 153},
 190 /* 145 */ { 76, 133, 153},
 191 /* 146 */ {  0,  95, 127},
 192 /* 147 */ { 63, 111, 127},
 193 /* 148 */ {  0,  57,  76},
 194 /* 149 */ { 38,  66,  76},
 195 /* 150 */ {  0, 127, 255},
 196 /* 151 */ {127, 191, 255},
 197 /* 152 */ {  0, 102, 204},
 198 /* 153 */ {102, 153, 204},
 199 /* 154 */ {  0,  76, 153},
 200 /* 155 */ { 76, 114, 153},
 201 /* 156 */ {  0,  63, 127},
 202 /* 157 */ { 63,  95, 127},
 203 /* 158 */ {  0,  38,  76},
 204 /* 159 */ { 38,  57,  76},
 205 /* 160 */ {  0,  63, 255},
 206 /* 161 */ {127, 159, 255},
 207 /* 162 */ {  0,  51, 204},
 208 /* 163 */ {102, 127, 204},
 209 /* 164 */ {  0,  38, 153},
 210 /* 165 */ { 76,  95, 153},
 211 /* 166 */ {  0,  31, 127},
 212 /* 167 */ { 63,  79, 127},
 213 /* 168 */ {  0,  19,  76},
 214 /* 169 */ { 38,  47,  76},
 215 /* 170 */ {  0,   0, 255},
 216 /* 171 */ {127, 127, 255},
 217 /* 172 */ {  0,   0, 204},
 218 /* 173 */ {102, 102, 204},
 219 /* 174 */ {  0,   0, 153},
 220 /* 175 */ { 76,  76, 153},
 221 /* 176 */ {  0,   0, 127},
 222 /* 177 */ { 63,  63, 127},
 223 /* 178 */ {  0,   0,  76},
 224 /* 179 */ { 38,  38,  76},
 225 /* 180 */ { 63,   0, 255},
 226 /* 181 */ {159, 127, 255},
 227 /* 182 */ { 51,   0, 204},
 228 /* 183 */ {127, 102, 204},
 229 /* 184 */ { 38,   0, 153},
 230 /* 185 */ { 95,  76, 153},
 231 /* 186 */ { 31,   0, 127},
 232 /* 187 */ { 79,  63, 127},
 233 /* 188 */ { 19,   0,  76},
 234 /* 189 */ { 47,  38,  76},
 235 /* 190 */ {127,   0, 255},
 236 /* 191 */ {191, 127, 255},
 237 /* 192 */ {102,   0, 204},
 238 /* 193 */ {153, 102, 204},
 239 /* 194 */ { 76,   0, 153},
 240 /* 195 */ {114,  76, 153},
 241 /* 196 */ { 63,   0, 127},
 242 /* 197 */ { 95,  63, 127},
 243 /* 198 */ { 38,   0,  76},
 244 /* 199 */ { 57,  38,  76},
 245 /* 200 */ {191,   0, 255},
 246 /* 201 */ {223, 127, 255},
 247 /* 202 */ {153,   0, 204},
 248 /* 203 */ {178, 102, 204},
 249 /* 204 */ {114,   0, 153},
 250 /* 205 */ {133,  76, 153},
 251 /* 206 */ { 95,   0, 127},
 252 /* 207 */ {111,  63, 127},
 253 /* 208 */ { 57,   0,  76},
 254 /* 209 */ { 66,  38,  76},
 255 /* 210 */ {255,   0, 255},
 256 /* 211 */ {255, 127, 255},
 257 /* 212 */ {204,   0, 204},
 258 /* 213 */ {204, 102, 204},
 259 /* 214 */ {153,   0, 153},
 260 /* 215 */ {153,  76, 153},
 261 /* 216 */ {127,   0, 127},
 262 /* 217 */ {127,  63, 127},
 263 /* 218 */ { 76,   0,  76},
 264 /* 219 */ { 76,  38,  76},
 265 /* 220 */ {255,   0, 191},
 266 /* 221 */ {255, 127, 223},
 267 /* 222 */ {204,   0, 153},
 268 /* 223 */ {204, 102, 178},
 269 /* 224 */ {153,   0, 114},
 270 /* 225 */ {153,  76, 133},
 271 /* 226 */ {127,   0,  95},
 272 /* 227 */ {127,  63, 111},
 273 /* 228 */ { 76,   0,  57},
 274 /* 229 */ { 76,  38,  66},
 275 /* 230 */ {255,   0, 127},
 276 /* 231 */ {255, 127, 191},
 277 /* 232 */ {204,   0, 102},
 278 /* 233 */ {204, 102, 153},
 279 /* 234 */ {153,   0,  76},
 280 /* 235 */ {153,  76, 114},
 281 /* 236 */ {127,   0,  63},
 282 /* 237 */ {127,  63,  95},
 283 /* 238 */ { 76,   0,  38},
 284 /* 239 */ { 76,  38,  57},
 285 /* 240 */ {255,   0,  63},
 286 /* 241 */ {255, 127, 159},
 287 /* 242 */ {204,   0,  51},
 288 /* 243 */ {204, 102, 127},
 289 /* 244 */ {153,   0,  38},
 290 /* 245 */ {153,  76,  95},
 291 /* 246 */ {127,   0,  31},
 292 /* 247 */ {127,  63,  79},
 293 /* 248 */ { 76,   0,  19},
 294 /* 249 */ { 76,  38,  47},
 295 /* 250 */ { 51,  51,  51},
 296 /* 251 */ { 91,  91,  91},
 297 /* 252 */ {132, 132, 132},
 298 /* 253 */ {173, 173, 173},
 299 /* 254 */ {214, 214, 214},
 300 /* 255 */ {255, 255, 255}
 301 };
 302
 303 inline DXFVector Cross(const DXFVector& v1, const DXFVector& v2)
 304 {
 305     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);
 306 }
 307
 308 void DXFFace::CalculateNormal()
 309 {
 310     DXFVector v01, v02;
 311     v01.x = v0.x - v1.x;
 312     v01.y = v0.y - v1.y;
 313     v01.z = v0.z - v1.z;
 314     v02.x = v0.x - v2.x;
 315     v02.y = v0.y - v2.y;
 316     v02.z = v0.z - v2.z;
 317     n = Cross(v01, v02);
 318     float mod = sqrt(n.x*n.x + n.y*n.y + n.z*n.z);
 319     n.x /= mod;
 320     n.y /= mod;
 321     n.z /= mod;
 322 }
 323
 324 // convert an AutoCAD ACI colour to wxWidgets RGB colour
 325 inline wxColour ACIColourToRGB(int col)
 326 {
 327     wxASSERT(col >= 0 && col <= 255);
 328     return wxColour(aci_to_rgb[col].r, aci_to_rgb[col].g, aci_to_rgb[col].b);
 329 }
 330
 331 // DXFReader constructor
 332 DXFRenderer::DXFRenderer()
 333 {
 334     m_loaded = false;
 335 }
 336
 337 // DXFReader destructor
 338 DXFRenderer::~DXFRenderer()
 339 {
 340     Clear();
 341 }
 342
 343 // deallocate all the dynamic data
 344 void DXFRenderer::Clear()
 345 {
 346     m_loaded = false;
 347     {
 348         for (DXFLayerList::compatibility_iterator node = m_layers.GetFirst(); node; node = node->GetNext())
 349         {
 350             DXFLayer *current = node->GetData();
 351             delete current;
 352         }
 353     }
 354     m_layers.Clear();
 355     {
 356         for (DXFEntityList::compatibility_iterator node = m_entities.GetFirst(); node; node = node->GetNext())
 357         {
 358             DXFEntity *current = node->GetData();
 359             delete current;
 360         }
 361         m_entities.Clear();
 362     }
 363 }
 364
 365 int DXFRenderer::GetLayerColour(const wxString& layer) const
 366 {
 367     for (DXFLayerList::compatibility_iterator node = m_layers.GetFirst(); node; node = node->GetNext())
 368     {
 369         DXFLayer *current = node->GetData();
 370         if (current->name == layer)
 371             return current->colour;
 372     }
 373     return 7;   // white
 374 }
 375
 376 // read two sequential lines
 377 inline void GetLines(wxTextInputStream& text, wxString& line1, wxString& line2)
 378 {
 379     line1 = text.ReadLine().Trim().Trim(false);
 380     line2 = text.ReadLine().Trim().Trim(false);
 381 }
 382
 383 // parse header section: just skip everything
 384 bool DXFRenderer::ParseHeader(wxInputStream& stream)
 385 {
 386     wxTextInputStream text(stream);
 387     wxString line1, line2;
 388     while (stream.CanRead())
 389     {
 390         GetLines(text, line1, line2);
 391         if (line1 == wxT("0") && line2 == wxT("ENDSEC"))
 392             return true;
 393     }
 394     return false;
 395 }
 396
 397 // parse tables section: save layers name and colour
 398 bool DXFRenderer::ParseTables(wxInputStream& stream)
 399 {
 400     wxTextInputStream text(stream);
 401     wxString line1, line2;
 402     bool inlayer=false;
 403     DXFLayer layer;
 404     while (stream.CanRead())
 405     {
 406         GetLines(text, line1, line2);
 407         if (line1 == wxT("0") && inlayer)
 408         {
 409             // flush layer
 410             if (!layer.name.IsEmpty() && layer.colour != -1)
 411             {
 412                 DXFLayer *p = new DXFLayer;
 413                 p->name = layer.name;
 414                 p->colour = layer.colour;
 415                 m_layers.Append(p);
 416             }
 417             layer = DXFLayer();
 418             inlayer = false;
 419         }
 420         if (line1 == wxT("0") && line2 == wxT("ENDSEC"))
 421             return true;
 422         else if (line1 == wxT("0") && line2 == wxT("LAYER"))
 423             inlayer = true;
 424         else if (inlayer)
 425         {
 426             if (line1 == wxT("2")) // layer name
 427                 layer.name = line2;
 428             else if (line1 == wxT("62")) // ACI colour
 429             {
 430                 long l;
 431                 line2.ToLong(&l);
 432                 layer.colour = l;
 433             }
 434         }
 435     }
 436     return false;
 437 }
 438
 439 // This method is used instead of numStr.ToDouble(d) because the latter
 440 // (wxString::ToDouble()) takes the systems proper locale into account,
 441 // whereas the implementation below works with the default locale.
 442 // (Converting numbers that are formatted in the default locale can fail
 443 //  with system locales that use e.g. the comma as the decimal separator.)
 444 static double ToDouble(const wxString& numStr)
 445 {
 446     double             d;
 447     std::string        numStr_(numStr.c_str());
 448     std::istringstream iss(numStr_);
 449
 450     iss >> d;
 451
 452     return d;
 453 }
 454
 455 // parse entities section: save 3DFACE and LINE entities
 456 bool DXFRenderer::ParseEntities(wxInputStream& stream)
 457 {
 458     wxTextInputStream text(stream);
 459     wxString line1, line2;
 460     int state = 0;  // 0: none, 1: 3DFACE, 2: LINE
 461     DXFVector v[4];
 462     int colour = -1;
 463     wxString layer;
 464     while (stream.CanRead())
 465     {
 466         GetLines(text, line1, line2);
 467         if (line1 == wxT("0") && state > 0)
 468         {
 469             // flush entity
 470             if (state == 1) // 3DFACE
 471             {
 472                 DXFFace *p = new DXFFace;
 473                 p->v0 = v[0];
 474                 p->v1 = v[1];
 475                 p->v2 = v[2];
 476                 p->v3 = v[3];
 477                 p->CalculateNormal();
 478                 if (colour != -1)
 479                     p->colour = colour;
 480                 else
 481                     p->colour = GetLayerColour(layer);
 482                 m_entities.Append(p);
 483                 colour = -1; layer = wxEmptyString;
 484                 v[0] = v[1] = v[2] = v[3] = DXFVector();
 485                 state = 0;
 486             }
 487             else if (state == 2) // LINE
 488             {
 489                 DXFLine *p = new DXFLine;
 490                 p->v0 = v[0];
 491                 p->v1 = v[1];
 492                 if (colour != -1)
 493                     p->colour = colour;
 494                 else
 495                     p->colour = GetLayerColour(layer);
 496                 m_entities.Append(p);
 497                 colour = -1; layer = wxEmptyString;
 498                 v[0] = v[1] = v[2] = v[3] = DXFVector();
 499                 state = 0;
 500             }
 501         }
 502         if (line1 == wxT("0") && line2 == wxT("ENDSEC"))
 503             return true;
 504         else if (line1 == wxT("0") && line2 == wxT("3DFACE"))
 505             state = 1;
 506         else if (line1 == wxT("0") && line2 == wxT("LINE"))
 507             state = 2;
 508         else if (state > 0)
 509         {
 510             const double d=ToDouble(line2);
 511
 512             if (line1 == wxT("10"))
 513                 v[0].x = d;
 514             else if (line1 == wxT("20"))
 515                 v[0].y = d;
 516             else if (line1 == wxT("30"))
 517                 v[0].z = d;
 518             else if (line1 == wxT("11"))
 519                 v[1].x = d;
 520             else if (line1 == wxT("21"))
 521                 v[1].y = d;
 522             else if (line1 == wxT("31"))
 523                 v[1].z = d;
 524             else if (line1 == wxT("12"))
 525                 v[2].x = d;
 526             else if (line1 == wxT("22"))
 527                 v[2].y = d;
 528             else if (line1 == wxT("32"))
 529                 v[2].z = d;
 530             else if (line1 == wxT("13"))
 531                 v[3].x = d;
 532             else if (line1 == wxT("23"))
 533                 v[3].y = d;
 534             else if (line1 == wxT("33"))
 535                 v[3].z = d;
 536             else if (line1 == wxT("8"))  // layer
 537                 layer = line2;
 538             else if (line1 == wxT("62")) // colour
 539             {
 540                 long l;
 541                 line2.ToLong(&l);
 542                 colour = l;
 543             }
 544         }
 545     }
 546     return false;
 547 }
 548
 549 // parse and load a DXF file
 550 // currently pretty limited, but knows enought do handle 3DFACEs and LINEs
 551 bool DXFRenderer::Load(wxInputStream& stream)
 552 {
 553     Clear();
 554     wxTextInputStream text(stream);
 555
 556     wxString line1, line2;
 557     while (stream.CanRead())
 558     {
 559         GetLines(text, line1, line2);
 560         if (line1 == wxT("999")) // comment
 561             continue;
 562         else if (line1 == wxT("0") && line2 == wxT("SECTION"))
 563         {
 564             GetLines(text, line1, line2);
 565             if (line1 == wxT("2"))
 566             {
 567                 if (line2 == wxT("HEADER"))
 568                 {
 569                     if (!ParseHeader(stream))
 570                         return false;
 571                 }
 572                 else if (line2 == wxT("TABLES"))
 573                 {
 574                     if (!ParseTables(stream))
 575                         return false;
 576                 }
 577                 else if (line2 == wxT("ENTITIES"))
 578                 {
 579                     if (!ParseEntities(stream))
 580                         return false;
 581                 }
 582             }
 583         }
 584     }
 585
 586     NormalizeEntities();
 587     m_loaded = true;
 588     return true;
 589 }
 590
 591 inline float mymin(float x, float y) { return x < y ? x : y; }
 592 inline float mymax(float x, float y) { return x > y ? x : y; }
 593
 594 // Scale object boundings to [-5,5]
 595 void DXFRenderer::NormalizeEntities()
 596 {
 597     // calculate current min and max boundings of object
 598     DXFVector minv(10e20f, 10e20f, 10e20f);
 599     DXFVector maxv(-10e20f, -10e20f, -10e20f);
 600     for (DXFEntityList::compatibility_iterator node = m_entities.GetFirst(); node; node = node->GetNext())
 601     {
 602         DXFEntity *p = node->GetData();
 603         if (p->type == DXFEntity::Line)
 604         {
 605             DXFLine *line = (DXFLine *)p;
 606             const DXFVector *v[2] = { &line->v0, &line->v1 };
 607             for (int i = 0; i < 2; ++i)
 608             {
 609                 minv.x = mymin(v[i]->x, minv.x);
 610                 minv.y = mymin(v[i]->y, minv.y);
 611                 minv.z = mymin(v[i]->z, minv.z);
 612                 maxv.x = mymax(v[i]->x, maxv.x);
 613                 maxv.y = mymax(v[i]->y, maxv.y);
 614                 maxv.z = mymax(v[i]->z, maxv.z);
 615             }
 616         } else if (p->type == DXFEntity::Face)
 617         {
 618             DXFFace *face = (DXFFace *)p;
 619             const DXFVector *v[4] = { &face->v0, &face->v1, &face->v2, &face->v3 };
 620             for (int i = 0; i < 4; ++i)
 621             {
 622                 minv.x = mymin(v[i]->x, minv.x);
 623                 minv.y = mymin(v[i]->y, minv.y);
 624                 minv.z = mymin(v[i]->z, minv.z);
 625                 maxv.x = mymax(v[i]->x, maxv.x);
 626                 maxv.y = mymax(v[i]->y, maxv.y);
 627                 maxv.z = mymax(v[i]->z, maxv.z);
 628             }
 629        }
 630     }
 631
 632     // rescale object down to [-5,5]
 633     DXFVector span(maxv.x - minv.x, maxv.y - minv.y, maxv.z - minv.z);
 634     float factor = mymin(mymin(10.0f / span.x, 10.0f / span.y), 10.0f / span.z);
 635     for (DXFEntityList::compatibility_iterator node2 = m_entities.GetFirst(); node2; node2 = node2->GetNext())
 636     {
 637         DXFEntity *p = node2->GetData();
 638         if (p->type == DXFEntity::Line)
 639         {
 640             DXFLine *line = (DXFLine *)p;
 641             DXFVector *v[2] = { &line->v0, &line->v1 };
 642             for (int i = 0; i < 2; ++i)
 643             {
 644                 v[i]->x -= minv.x + span.x/2; v[i]->x *= factor;
 645                 v[i]->y -= minv.y + span.y/2; v[i]->y *= factor;
 646                 v[i]->z -= minv.z + span.z/2; v[i]->z *= factor;
 647             }
 648         } else if (p->type == DXFEntity::Face)
 649         {
 650             DXFFace *face = (DXFFace *)p;
 651             DXFVector *v[4] = { &face->v0, &face->v1, &face->v2, &face->v3 };
 652             for (int i = 0; i < 4; ++i)
 653             {
 654                 v[i]->x -= minv.x + span.x/2; v[i]->x *= factor;
 655                 v[i]->y -= minv.y + span.y/2; v[i]->y *= factor;
 656                 v[i]->z -= minv.z + span.z/2; v[i]->z *= factor;
 657             }
 658        }
 659     }
 660 }
 661
 662 // OpenGL renderer for DXF entities
 663 void DXFRenderer::Render() const
 664 {
 665     if (!m_loaded)
 666         return;
 667
 668     for (DXFEntityList::compatibility_iterator node = m_entities.GetFirst(); node; node = node->GetNext())
 669     {
 670         DXFEntity *p = node->GetData();
 671         wxColour c = ACIColourToRGB(p->colour);
 672         if (p->type == DXFEntity::Line)
 673         {
 674             DXFLine *line = (DXFLine *)p;
 675             glBegin(GL_LINES);
 676             glColor3f(c.Red()/255.0,c.Green()/255.0,c.Blue()/255.0);
 677             glVertex3f(line->v0.x, line->v0.y, line->v0.z);
 678             glVertex3f(line->v1.x, line->v1.y, line->v1.z);
 679             glEnd();
 680         }
 681         else if (p->type == DXFEntity::Face)
 682         {
 683             DXFFace *face = (DXFFace *)p;
 684             glBegin(GL_TRIANGLES);
 685             glColor3f(c.Red()/255.0,c.Green()/255.0,c.Blue()/255.0);
 686             glNormal3f(face->n.x, face->n.y, face->n.z);
 687             glVertex3f(face->v0.x, face->v0.y, face->v0.z);
 688             glVertex3f(face->v1.x, face->v1.y, face->v1.z);
 689             glVertex3f(face->v2.x, face->v2.y, face->v2.z);
 690             glEnd();
 691         }
 692     }
 693 }