src/os2/dc.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dc.cpp
   3 // Purpose:     wxDC class
   4 // Author:      David Webster
   5 // Modified by:
   6 // Created:     10/14/99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) David Webster
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifndef WX_PRECOMP
  16     #include "wx/window.h"
  17     #include "wx/dc.h"
  18     #include "wx/utils.h"
  19     #include "wx/dialog.h"
  20     #include "wx/app.h"
  21     #include "wx/bitmap.h"
  22     #include "wx/dcmemory.h"
  23     #include "wx/log.h"
  24     #include "wx/icon.h"
  25 #endif
  26
  27 #include "wx/dcprint.h"
  28
  29 #include <string.h>
  30 #include <math.h>
  31
  32 #include "wx/os2/private.h"
  33
  34 #if !USE_SHARED_LIBRARY
  35     IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
  36 #endif
  37
  38 // ---------------------------------------------------------------------------
  39 // constants
  40 // ---------------------------------------------------------------------------
  41
  42 static const int VIEWPORT_EXTENT = 1000;
  43
  44 static const int MM_POINTS = 9;
  45 static const int MM_METRIC = 10;
  46
  47 // ===========================================================================
  48 // implementation
  49 // ===========================================================================
  50
  51 // ---------------------------------------------------------------------------
  52 // wxDC
  53 // ---------------------------------------------------------------------------
  54
  55 wxDC::wxDC(void)
  56 {
  57     m_canvas  = NULL;
  58
  59     m_oldBitmap  = 0;
  60     m_oldPen     = 0;
  61     m_oldBrush   = 0;
  62     m_oldFont    = 0;
  63     m_oldPalette = 0;
  64
  65     m_bOwnsDC = FALSE;
  66     m_hDC        = 0;
  67     m_hDCCount   = 0;
  68 };
  69
  70 wxDC::~wxDC(void)
  71 {
  72     // TODO:
  73 };
  74
  75 // This will select current objects out of the DC,
  76 // which is what you have to do before deleting the
  77 // DC.
  78 void wxDC::SelectOldObjects(WXHDC dc)
  79 {
  80     if (dc)
  81     {
  82         if (m_oldBitmap)
  83         {
  84 //            ::SelectObject((HDC) dc, (HBITMAP) m_oldBitmap);
  85             if (m_selectedBitmap.Ok())
  86             {
  87                 m_selectedBitmap.SetSelectedInto(NULL);
  88             }
  89         }
  90         m_oldBitmap = 0;
  91         if (m_oldPen)
  92         {
  93 //            ::SelectObject((HDC) dc, (HPEN) m_oldPen);
  94         }
  95         m_oldPen = 0;
  96         if (m_oldBrush)
  97         {
  98 //            ::SelectObject((HDC) dc, (HBRUSH) m_oldBrush);
  99         }
 100         m_oldBrush = 0;
 101         if (m_oldFont)
 102         {
 103 //            ::SelectObject((HDC) dc, (HFONT) m_oldFont);
 104         }
 105         m_oldFont = 0;
 106         if (m_oldPalette)
 107         {
 108 //            ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, TRUE);
 109         }
 110         m_oldPalette = 0;
 111     }
 112
 113     m_brush = wxNullBrush;
 114     m_pen = wxNullPen;
 115     m_palette = wxNullPalette;
 116     m_font = wxNullFont;
 117     m_backgroundBrush = wxNullBrush;
 118     m_selectedBitmap = wxNullBitmap;
 119 }
 120
 121 // ---------------------------------------------------------------------------
 122 // clipping
 123 // ---------------------------------------------------------------------------
 124
 125 void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
 126 {
 127    // TODO
 128 }
 129
 130 void wxDC::DoSetClippingRegion( wxCoord x, wxCoord y
 131                                ,wxCoord width, wxCoord height
 132                               )
 133 {
 134    // TODO
 135 }
 136
 137 void wxDC::DoClipping(WXHDC dc)
 138 {
 139     if (m_clipping && dc)
 140     {
 141 //      TODO:
 142 //      IntersectClipRect((HDC) dc, XLOG2DEV(m_clipX1), YLOG2DEV(m_clipY1),
 143 //                                  XLOG2DEV(m_clipX2), YLOG2DEV(m_clipY2));
 144     }
 145 }
 146
 147 void wxDC::DestroyClippingRegion(void)
 148 {
 149     // TODO:
 150 };
 151
 152 // ---------------------------------------------------------------------------
 153 // query capabilities
 154 // ---------------------------------------------------------------------------
 155
 156 bool wxDC::CanDrawBitmap() const
 157 {
 158     return TRUE;
 159 }
 160
 161 bool wxDC::CanGetTextExtent() const
 162 {
 163     // What sort of display is it?
 164     int technology = 0; // TODO:  ::GetDeviceCaps(GetHdc(), TECHNOLOGY);
 165
 166     // TODO: return (technology == DT_RASDISPLAY) || (technology == DT_RASPRINTER);
 167     return FALSE;
 168 }
 169
 170 int wxDC::GetDepth() const
 171 {
 172    // TODO:
 173    return (1);
 174 }
 175
 176 // ---------------------------------------------------------------------------
 177 // drawing
 178 // ---------------------------------------------------------------------------
 179
 180 void wxDC::Clear()
 181 {
 182    // TODO
 183 }
 184
 185 void wxDC::DoFloodFill( wxCoord x
 186                        ,wxCoord y
 187                        ,const wxColour& col
 188                        ,int style
 189                       )
 190 {
 191    // TODO
 192 }
 193
 194 bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
 195 {
 196    // TODO
 197    return(TRUE);
 198 }
 199
 200 void wxDC::DoCrossHair(wxCoord x, wxCoord y)
 201 {
 202    // TODO
 203 }
 204
 205 void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
 206 {
 207    // TODO
 208 }
 209
 210 void wxDC::DoDrawArc( wxCoord x1, wxCoord y1
 211                      ,wxCoord x2, wxCoord y2
 212                      ,wxCoord xc, wxCoord yc
 213                     )
 214 {
 215    // TODO
 216 }
 217
 218 void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
 219 {
 220    // TODO
 221 }
 222
 223 void wxDC::DoDrawPolygon(int n, wxPoint points[]
 224                          ,wxCoord xoffset, wxCoord yoffset
 225                          ,int fillStyle
 226                         )
 227 {
 228    // TODO
 229 }
 230
 231 void wxDC::DoDrawLines( int n, wxPoint points[]
 232                        ,wxCoord xoffset, wxCoord yoffset
 233                       )
 234 {
 235    // TODO
 236 }
 237
 238 void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 239 {
 240    // TODO
 241 }
 242
 243 void wxDC::DoDrawRoundedRectangle( wxCoord x, wxCoord y
 244                                   ,wxCoord width, wxCoord height
 245                                   ,double radius
 246                                  )
 247 {
 248    // TODO
 249 }
 250
 251 void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 252 {
 253    // TODO
 254 }
 255
 256 void wxDC::DoDrawEllipticArc( wxCoord x
 257                              ,wxCoord y
 258                              ,wxCoord w
 259                              ,wxCoord h
 260                              ,double sa
 261                              ,double ea
 262                             )
 263 {
 264    // TODO
 265 }
 266
 267 void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 268 {
 269    // TODO
 270 }
 271
 272 void wxDC::DoDrawBitmap( const wxBitmap &bmp
 273                         ,wxCoord x, wxCoord y
 274                         ,bool useMask
 275                        )
 276 {
 277    // TODO
 278 }
 279
 280 void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
 281 {
 282    // TODO
 283 }
 284
 285 // ---------------------------------------------------------------------------
 286 // set GDI objects
 287 // ---------------------------------------------------------------------------
 288
 289 void wxDC::SetPalette(const wxPalette& palette)
 290 {
 291    // TODO
 292 }
 293
 294 void wxDC::SetFont(const wxFont& font)
 295 {
 296    // TODO
 297 }
 298
 299 void wxDC::SetPen(const wxPen& pen)
 300 {
 301    // TODO
 302 }
 303 void wxDC::SetBrush(const wxBrush& brush)
 304 {
 305    // TODO
 306 }
 307
 308 void wxDC::SetBackground(const wxBrush& brush)
 309 {
 310    // TODO
 311 }
 312
 313 void wxDC::SetBackgroundMode(int mode)
 314 {
 315    // TODO
 316 }
 317
 318 void wxDC::SetLogicalFunction(int function)
 319 {
 320    // TODO
 321 }
 322
 323 void wxDC::SetRop(WXHDC dc)
 324 {
 325     if (!dc || m_logicalFunction < 0)
 326         return;
 327
 328     int c_rop;
 329     // These may be wrong
 330     switch (m_logicalFunction)
 331     {
 332 // TODO: Figure this stuff out
 333         //    case wxXOR: c_rop = R2_XORPEN; break;
 334 //    case wxXOR: c_rop = R2_NOTXORPEN; break;
 335 //    case wxINVERT: c_rop = R2_NOT; break;
 336 //    case wxOR_REVERSE: c_rop = R2_MERGEPENNOT; break;
 337 //    case wxAND_REVERSE: c_rop = R2_MASKPENNOT; break;
 338 //    case wxCLEAR: c_rop = R2_WHITE; break;
 339 //    case wxSET: c_rop = R2_BLACK; break;
 340 //    case wxSRC_INVERT: c_rop = R2_NOTCOPYPEN; break;
 341 //    case wxOR_INVERT: c_rop = R2_MERGENOTPEN; break;
 342 //    case wxAND: c_rop = R2_MASKPEN; break;
 343 //    case wxOR: c_rop = R2_MERGEPEN; break;
 344 //    case wxAND_INVERT: c_rop = R2_MASKNOTPEN; break;
 345 //    case wxEQUIV:
 346 //    case wxNAND:
 347 //    case wxCOPY:
 348     default:
 349 //      c_rop = R2_COPYPEN;
 350         break;
 351     }
 352 //    SetROP2((HDC) dc, c_rop);
 353 }
 354
 355 bool wxDC::StartDoc(const wxString& message)
 356 {
 357     // We might be previewing, so return TRUE to let it continue.
 358     return TRUE;
 359 }
 360
 361 void wxDC::EndDoc()
 362 {
 363 }
 364
 365 void wxDC::StartPage()
 366 {
 367 }
 368
 369 void wxDC::EndPage()
 370 {
 371 }
 372
 373 // ---------------------------------------------------------------------------
 374 // text metrics
 375 // ---------------------------------------------------------------------------
 376
 377 wxCoord wxDC::GetCharHeight() const
 378 {
 379     // TODO
 380     return(1);
 381 }
 382
 383 wxCoord wxDC::GetCharWidth() const
 384 {
 385     // TODO
 386     return(1);
 387 }
 388
 389 void wxDC::DoGetTextExtent( const wxString& string
 390                            ,wxCoord* x
 391                            ,wxCoord* y
 392                            ,wxCoord* decent
 393                            ,wxCoord* externalLeading
 394                            ,wxFont* theFont
 395                           ) const
 396 {
 397    // TODO:
 398 }
 399
 400 void wxDC::SetMapMode( int mode )
 401 {
 402     // TODO:
 403 };
 404
 405 void wxDC::SetUserScale(double x, double y)
 406 {
 407     m_userScaleX = x;
 408     m_userScaleY = y;
 409
 410     SetMapMode(m_mappingMode);
 411 }
 412
 413 void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
 414 {
 415     m_signX = xLeftRight ? 1 : -1;
 416     m_signY = yBottomUp ? -1 : 1;
 417
 418     SetMapMode(m_mappingMode);
 419 }
 420
 421 void wxDC::SetSystemScale(double x, double y)
 422 {
 423     m_scaleX = x;
 424     m_scaleY = y;
 425
 426     SetMapMode(m_mappingMode);
 427 }
 428
 429 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 430 {
 431     // TODO:
 432 };
 433
 434 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 435 {
 436     // TODO:
 437 };
 438
 439 // ---------------------------------------------------------------------------
 440 // coordinates transformations
 441 // ---------------------------------------------------------------------------
 442
 443 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 444 {
 445     wxCoord new_x = x - m_deviceOriginX;
 446     if (new_x > 0)
 447         return (wxCoord)((double)(new_x) / m_scaleX + 0.5) * m_signX + m_logicalOriginX;
 448     else
 449         return (wxCoord)((double)(new_x) / m_scaleX - 0.5) * m_signX + m_logicalOriginX;
 450 };
 451
 452 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 453 {
 454     if (x > 0)
 455         return (wxCoord)((double)(x) / m_scaleX + 0.5);
 456     else
 457         return (wxCoord)((double)(x) / m_scaleX - 0.5);
 458 };
 459
 460 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 461 {
 462     wxCoord new_y = y - m_deviceOriginY;
 463     if (new_y > 0)
 464         return (wxCoord)((double)(new_y) / m_scaleY + 0.5) * m_signY + m_logicalOriginY;
 465     else
 466         return (wxCoord)((double)(new_y) / m_scaleY - 0.5) * m_signY + m_logicalOriginY;
 467 };
 468
 469 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 470 {
 471     if (y > 0)
 472         return (wxCoord)((double)(y) / m_scaleY + 0.5);
 473     else
 474         return (wxCoord)((double)(y) / m_scaleY - 0.5);
 475 };
 476
 477 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 478 {
 479     wxCoord new_x = x - m_logicalOriginX;
 480     if (new_x > 0)
 481         return (wxCoord)((double)(new_x) * m_scaleX + 0.5) * m_signX + m_deviceOriginX;
 482     else
 483     return (wxCoord)((double)(new_x) * m_scaleX - 0.5) * m_signX + m_deviceOriginX;
 484 };
 485
 486 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 487 {
 488     if (x > 0)
 489         return (wxCoord)((double)(x) * m_scaleX + 0.5);
 490     else
 491         return (wxCoord)((double)(x) * m_scaleX - 0.5);
 492 };
 493
 494 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 495 {
 496     wxCoord new_y = y - m_logicalOriginY;
 497     if (new_y > 0)
 498         return (wxCoord)((double)(new_y) * m_scaleY + 0.5) * m_signY + m_deviceOriginY;
 499     else
 500         return (wxCoord)((double)(new_y) * m_scaleY - 0.5) * m_signY + m_deviceOriginY;
 501 };
 502
 503 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 504 {
 505     if (y > 0)
 506         return (wxCoord)((double)(y) * m_scaleY + 0.5);
 507     else
 508         return (wxCoord)((double)(y) * m_scaleY - 0.5);
 509 };
 510
 511 // ---------------------------------------------------------------------------
 512 // bit blit
 513 // ---------------------------------------------------------------------------
 514
 515 bool wxDC::DoBlit( wxCoord xdest
 516                   ,wxCoord ydest
 517                   ,wxCoord width
 518                   ,wxCoord height
 519                   ,wxDC *source
 520                   ,wxCoord xsrc
 521                   ,wxCoord ysrc
 522                   ,int  rop
 523                   ,bool useMask
 524                  )
 525 {
 526    // TODO
 527    return(TRUE);
 528 }
 529
 530 void wxDC::DoGetSize( int* width, int* height ) const
 531 {
 532     // TODO:
 533 };
 534
 535 void wxDC::DoGetSizeMM( int* width, int* height ) const
 536 {
 537     // TODO:
 538 };
 539
 540 wxSize wxDC::GetPPI() const
 541 {
 542    int x = 1;
 543    int y = 1;
 544    // TODO:
 545    return (wxSize(x,y));
 546 }
 547
 548 void wxDC::SetLogicalScale( double x, double y )
 549 {
 550     // TODO:
 551 };
 552
 553 #if WXWIN_COMPATIBILITY
 554 void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
 555                          float *descent, float *externalLeading,
 556                          wxFont *theFont, bool use16bit) const
 557 {
 558     wxCoord x1, y1, descent1, externalLeading1;
 559     GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
 560     *x = x1; *y = y1;
 561     if (descent)
 562         *descent = descent1;
 563     if (externalLeading)
 564         *externalLeading = externalLeading1;
 565 }
 566 #endif
 567
 568 // ---------------------------------------------------------------------------
 569 // spline drawing code
 570 // ---------------------------------------------------------------------------
 571
 572 #if wxUSE_SPLINES
 573
 574 class wxSpline: public wxObject
 575 {
 576 public:
 577     int type;
 578     wxList *points;
 579
 580     wxSpline(wxList *list);
 581     void DeletePoints();
 582
 583     // Doesn't delete points
 584     ~wxSpline();
 585 };
 586
 587 void wx_draw_open_spline(wxDC *dc, wxSpline *spline);
 588
 589 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
 590                          double a3, double b3, double a4, double b4);
 591 void wx_clear_stack();
 592 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
 593                   double *y3, double *x4, double *y4);
 594 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
 595                     double x4, double y4);
 596 static bool wx_spline_add_point(double x, double y);
 597 static void wx_spline_draw_point_array(wxDC *dc);
 598 wxSpline *wx_make_spline(int x1, int y1, int x2, int y2, int x3, int y3);
 599
 600 void wxDC::DoDrawSpline(wxList *list)
 601 {
 602     wxSpline spline(list);
 603
 604     wx_draw_open_spline(this, &spline);
 605 }
 606
 607 wxList wx_spline_point_list;
 608
 609 void wx_draw_open_spline(wxDC *dc, wxSpline *spline)
 610 {
 611     wxPoint *p;
 612     double           cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
 613     double           x1, y1, x2, y2;
 614
 615     wxNode *node = spline->points->First();
 616     p = (wxPoint *)node->Data();
 617
 618     x1 = p->x;
 619     y1 = p->y;
 620
 621     node = node->Next();
 622     p = (wxPoint *)node->Data();
 623
 624     x2 = p->x;
 625     y2 = p->y;
 626     cx1 = (double)((x1 + x2) / 2);
 627     cy1 = (double)((y1 + y2) / 2);
 628     cx2 = (double)((cx1 + x2) / 2);
 629     cy2 = (double)((cy1 + y2) / 2);
 630
 631     wx_spline_add_point(x1, y1);
 632
 633     while ((node = node->Next()) != NULL)
 634     {
 635         p = (wxPoint *)node->Data();
 636         x1 = x2;
 637         y1 = y2;
 638         x2 = p->x;
 639         y2 = p->y;
 640         cx4 = (double)(x1 + x2) / 2;
 641         cy4 = (double)(y1 + y2) / 2;
 642         cx3 = (double)(x1 + cx4) / 2;
 643         cy3 = (double)(y1 + cy4) / 2;
 644
 645         wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
 646
 647         cx1 = cx4;
 648         cy1 = cy4;
 649         cx2 = (double)(cx1 + x2) / 2;
 650         cy2 = (double)(cy1 + y2) / 2;
 651     }
 652
 653     wx_spline_add_point((double)wx_round(cx1), (double)wx_round(cy1));
 654     wx_spline_add_point(x2, y2);
 655
 656     wx_spline_draw_point_array(dc);
 657
 658 }
 659
 660 /********************* CURVES FOR SPLINES *****************************
 661
 662   The following spline drawing routine is from
 663
 664     "An Algorithm for High-Speed Curve Generation"
 665     by George Merrill Chaikin,
 666     Computer Graphics and Image Processing, 3, Academic Press,
 667     1974, 346-349.
 668
 669       and
 670
 671         "On Chaikin's Algorithm" by R. F. Riesenfeld,
 672         Computer Graphics and Image Processing, 4, Academic Press,
 673         1975, 304-310.
 674
 675 ***********************************************************************/
 676
 677 #define     half(z1, z2)    ((z1+z2)/2.0)
 678 #define     THRESHOLD   5
 679
 680 /* iterative version */
 681
 682 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
 683                          double b4)
 684 {
 685     register double  xmid, ymid;
 686     double           x1, y1, x2, y2, x3, y3, x4, y4;
 687
 688     wx_clear_stack();
 689     wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
 690
 691     while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
 692         xmid = (double)half(x2, x3);
 693         ymid = (double)half(y2, y3);
 694         if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
 695             fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
 696             wx_spline_add_point((double)wx_round(x1), (double)wx_round(y1));
 697             wx_spline_add_point((double)wx_round(xmid), (double)wx_round(ymid));
 698         } else {
 699             wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
 700                 (double)half(x3, x4), (double)half(y3, y4), x4, y4);
 701             wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
 702                 (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
 703         }
 704     }
 705 }
 706
 707
 708 /* utilities used by spline drawing routines */
 709
 710
 711 typedef struct wx_spline_stack_struct {
 712     double           x1, y1, x2, y2, x3, y3, x4, y4;
 713 }
 714 Stack;
 715
 716 #define         SPLINE_STACK_DEPTH             20
 717 static Stack    wx_spline_stack[SPLINE_STACK_DEPTH];
 718 static Stack   *wx_stack_top;
 719 static int      wx_stack_count;
 720
 721 void wx_clear_stack()
 722 {
 723     wx_stack_top = wx_spline_stack;
 724     wx_stack_count = 0;
 725 }
 726
 727 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
 728 {
 729     wx_stack_top->x1 = x1;
 730     wx_stack_top->y1 = y1;
 731     wx_stack_top->x2 = x2;
 732     wx_stack_top->y2 = y2;
 733     wx_stack_top->x3 = x3;
 734     wx_stack_top->y3 = y3;
 735     wx_stack_top->x4 = x4;
 736     wx_stack_top->y4 = y4;
 737     wx_stack_top++;
 738     wx_stack_count++;
 739 }
 740
 741 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
 742                   double *x3, double *y3, double *x4, double *y4)
 743 {
 744     if (wx_stack_count == 0)
 745         return (0);
 746     wx_stack_top--;
 747     wx_stack_count--;
 748     *x1 = wx_stack_top->x1;
 749     *y1 = wx_stack_top->y1;
 750     *x2 = wx_stack_top->x2;
 751     *y2 = wx_stack_top->y2;
 752     *x3 = wx_stack_top->x3;
 753     *y3 = wx_stack_top->y3;
 754     *x4 = wx_stack_top->x4;
 755     *y4 = wx_stack_top->y4;
 756     return (1);
 757 }
 758
 759 static bool wx_spline_add_point(double x, double y)
 760 {
 761     wxPoint *point = new wxPoint;
 762     point->x = (int) x;
 763     point->y = (int) y;
 764     wx_spline_point_list.Append((wxObject*)point);
 765     return TRUE;
 766 }
 767
 768 static void wx_spline_draw_point_array(wxDC *dc)
 769 {
 770     dc->DrawLines(&wx_spline_point_list, 0, 0);
 771     wxNode *node = wx_spline_point_list.First();
 772     while (node)
 773     {
 774         wxPoint *point = (wxPoint *)node->Data();
 775         delete point;
 776         delete node;
 777         node = wx_spline_point_list.First();
 778     }
 779 }
 780
 781 wxSpline::wxSpline(wxList *list)
 782 {
 783     points = list;
 784 }
 785
 786 wxSpline::~wxSpline()
 787 {
 788 }
 789
 790 void wxSpline::DeletePoints()
 791 {
 792     for(wxNode *node = points->First(); node; node = points->First())
 793     {
 794         wxPoint *point = (wxPoint *)node->Data();
 795         delete point;
 796         delete node;
 797     }
 798     delete points;
 799 }
 800
 801
 802 #endif // wxUSE_SPLINES
 803