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 void wxDC::DoDrawRotatedText(const wxString& text,
 286                              wxCoord x, wxCoord y,
 287                              double angle)
 288 {
 289    // TODO:
 290    /*
 291     if ( angle == 0.0 )
 292     {
 293         DoDrawText(text, x, y);
 294     }
 295     else
 296     {
 297         LOGFONT lf;
 298         wxFillLogFont(&lf, &m_font);
 299
 300         // GDI wants the angle in tenth of degree
 301         long angle10 = (long)(angle * 10);
 302         lf.lfEscapement = angle10;
 303         lf. lfOrientation = angle10;
 304
 305         HFONT hfont = ::CreateFontIndirect(&lf);
 306         if ( !hfont )
 307         {
 308             wxLogLastError("CreateFont");
 309         }
 310         else
 311         {
 312             HFONT hfontOld = ::SelectObject(GetHdc(), hfont);
 313
 314             DrawAnyText(text, x, y);
 315
 316             (void)::SelectObject(GetHdc(), hfontOld);
 317         }
 318
 319         // call the bounding box by adding all four vertices of the rectangle
 320         // containing the text to it (simpler and probably not slower than
 321         // determining which of them is really topmost/leftmost/...)
 322         wxCoord w, h;
 323         GetTextExtent(text, &w, &h);
 324
 325         double rad = DegToRad(angle);
 326
 327         // "upper left" and "upper right"
 328         CalcBoundingBox(x, y);
 329         CalcBoundingBox(x + w*cos(rad), y - h*sin(rad));
 330         CalcBoundingBox(x + h*sin(rad), y + h*cos(rad));
 331
 332         // "bottom left" and "bottom right"
 333         x += (wxCoord)(h*sin(rad));
 334         y += (wxCoord)(h*cos(rad));
 335         CalcBoundingBox(x, y);
 336         CalcBoundingBox(x + h*sin(rad), y + h*cos(rad));
 337     }
 338 */
 339 }
 340
 341 // ---------------------------------------------------------------------------
 342 // set GDI objects
 343 // ---------------------------------------------------------------------------
 344
 345 void wxDC::SetPalette(const wxPalette& palette)
 346 {
 347    // TODO
 348 }
 349
 350 void wxDC::SetFont(const wxFont& font)
 351 {
 352    // TODO
 353 }
 354
 355 void wxDC::SetPen(const wxPen& pen)
 356 {
 357    // TODO
 358 }
 359 void wxDC::SetBrush(const wxBrush& brush)
 360 {
 361    // TODO
 362 }
 363
 364 void wxDC::SetBackground(const wxBrush& brush)
 365 {
 366    // TODO
 367 }
 368
 369 void wxDC::SetBackgroundMode(int mode)
 370 {
 371    // TODO
 372 }
 373
 374 void wxDC::SetLogicalFunction(int function)
 375 {
 376    // TODO
 377 }
 378
 379 void wxDC::SetRop(WXHDC dc)
 380 {
 381     if (!dc || m_logicalFunction < 0)
 382         return;
 383
 384     int c_rop;
 385     // These may be wrong
 386     switch (m_logicalFunction)
 387     {
 388 // TODO: Figure this stuff out
 389         //    case wxXOR: c_rop = R2_XORPEN; break;
 390 //    case wxXOR: c_rop = R2_NOTXORPEN; break;
 391 //    case wxINVERT: c_rop = R2_NOT; break;
 392 //    case wxOR_REVERSE: c_rop = R2_MERGEPENNOT; break;
 393 //    case wxAND_REVERSE: c_rop = R2_MASKPENNOT; break;
 394 //    case wxCLEAR: c_rop = R2_WHITE; break;
 395 //    case wxSET: c_rop = R2_BLACK; break;
 396 //    case wxSRC_INVERT: c_rop = R2_NOTCOPYPEN; break;
 397 //    case wxOR_INVERT: c_rop = R2_MERGENOTPEN; break;
 398 //    case wxAND: c_rop = R2_MASKPEN; break;
 399 //    case wxOR: c_rop = R2_MERGEPEN; break;
 400 //    case wxAND_INVERT: c_rop = R2_MASKNOTPEN; break;
 401 //    case wxEQUIV:
 402 //    case wxNAND:
 403 //    case wxCOPY:
 404     default:
 405 //      c_rop = R2_COPYPEN;
 406         break;
 407     }
 408 //    SetROP2((HDC) dc, c_rop);
 409 }
 410
 411 bool wxDC::StartDoc(const wxString& message)
 412 {
 413     // We might be previewing, so return TRUE to let it continue.
 414     return TRUE;
 415 }
 416
 417 void wxDC::EndDoc()
 418 {
 419 }
 420
 421 void wxDC::StartPage()
 422 {
 423 }
 424
 425 void wxDC::EndPage()
 426 {
 427 }
 428
 429 // ---------------------------------------------------------------------------
 430 // text metrics
 431 // ---------------------------------------------------------------------------
 432
 433 wxCoord wxDC::GetCharHeight() const
 434 {
 435     // TODO
 436     return(1);
 437 }
 438
 439 wxCoord wxDC::GetCharWidth() const
 440 {
 441     // TODO
 442     return(1);
 443 }
 444
 445 void wxDC::DoGetTextExtent( const wxString& string
 446                            ,wxCoord* x
 447                            ,wxCoord* y
 448                            ,wxCoord* decent
 449                            ,wxCoord* externalLeading
 450                            ,wxFont* theFont
 451                           ) const
 452 {
 453    // TODO:
 454 }
 455
 456 void wxDC::SetMapMode( int mode )
 457 {
 458     // TODO:
 459 };
 460
 461 void wxDC::SetUserScale(double x, double y)
 462 {
 463     m_userScaleX = x;
 464     m_userScaleY = y;
 465
 466     SetMapMode(m_mappingMode);
 467 }
 468
 469 void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
 470 {
 471     m_signX = xLeftRight ? 1 : -1;
 472     m_signY = yBottomUp ? -1 : 1;
 473
 474     SetMapMode(m_mappingMode);
 475 }
 476
 477 void wxDC::SetSystemScale(double x, double y)
 478 {
 479     m_scaleX = x;
 480     m_scaleY = y;
 481
 482     SetMapMode(m_mappingMode);
 483 }
 484
 485 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 486 {
 487     // TODO:
 488 };
 489
 490 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 491 {
 492     // TODO:
 493 };
 494
 495 // ---------------------------------------------------------------------------
 496 // coordinates transformations
 497 // ---------------------------------------------------------------------------
 498
 499 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 500 {
 501     wxCoord new_x = x - m_deviceOriginX;
 502     if (new_x > 0)
 503         return (wxCoord)((double)(new_x) / m_scaleX + 0.5) * m_signX + m_logicalOriginX;
 504     else
 505         return (wxCoord)((double)(new_x) / m_scaleX - 0.5) * m_signX + m_logicalOriginX;
 506 };
 507
 508 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 509 {
 510     if (x > 0)
 511         return (wxCoord)((double)(x) / m_scaleX + 0.5);
 512     else
 513         return (wxCoord)((double)(x) / m_scaleX - 0.5);
 514 };
 515
 516 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 517 {
 518     wxCoord new_y = y - m_deviceOriginY;
 519     if (new_y > 0)
 520         return (wxCoord)((double)(new_y) / m_scaleY + 0.5) * m_signY + m_logicalOriginY;
 521     else
 522         return (wxCoord)((double)(new_y) / m_scaleY - 0.5) * m_signY + m_logicalOriginY;
 523 };
 524
 525 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 526 {
 527     if (y > 0)
 528         return (wxCoord)((double)(y) / m_scaleY + 0.5);
 529     else
 530         return (wxCoord)((double)(y) / m_scaleY - 0.5);
 531 };
 532
 533 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 534 {
 535     wxCoord new_x = x - m_logicalOriginX;
 536     if (new_x > 0)
 537         return (wxCoord)((double)(new_x) * m_scaleX + 0.5) * m_signX + m_deviceOriginX;
 538     else
 539     return (wxCoord)((double)(new_x) * m_scaleX - 0.5) * m_signX + m_deviceOriginX;
 540 };
 541
 542 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 543 {
 544     if (x > 0)
 545         return (wxCoord)((double)(x) * m_scaleX + 0.5);
 546     else
 547         return (wxCoord)((double)(x) * m_scaleX - 0.5);
 548 };
 549
 550 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 551 {
 552     wxCoord new_y = y - m_logicalOriginY;
 553     if (new_y > 0)
 554         return (wxCoord)((double)(new_y) * m_scaleY + 0.5) * m_signY + m_deviceOriginY;
 555     else
 556         return (wxCoord)((double)(new_y) * m_scaleY - 0.5) * m_signY + m_deviceOriginY;
 557 };
 558
 559 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 560 {
 561     if (y > 0)
 562         return (wxCoord)((double)(y) * m_scaleY + 0.5);
 563     else
 564         return (wxCoord)((double)(y) * m_scaleY - 0.5);
 565 };
 566
 567 // ---------------------------------------------------------------------------
 568 // bit blit
 569 // ---------------------------------------------------------------------------
 570
 571 bool wxDC::DoBlit( wxCoord xdest
 572                   ,wxCoord ydest
 573                   ,wxCoord width
 574                   ,wxCoord height
 575                   ,wxDC *source
 576                   ,wxCoord xsrc
 577                   ,wxCoord ysrc
 578                   ,int  rop
 579                   ,bool useMask
 580                  )
 581 {
 582    // TODO
 583    return(TRUE);
 584 }
 585
 586 void wxDC::DoGetSize( int* width, int* height ) const
 587 {
 588     // TODO:
 589 };
 590
 591 void wxDC::DoGetSizeMM( int* width, int* height ) const
 592 {
 593     // TODO:
 594 };
 595
 596 wxSize wxDC::GetPPI() const
 597 {
 598    int x = 1;
 599    int y = 1;
 600    // TODO:
 601    return (wxSize(x,y));
 602 }
 603
 604 void wxDC::SetLogicalScale( double x, double y )
 605 {
 606     // TODO:
 607 };
 608
 609 #if WXWIN_COMPATIBILITY
 610 void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
 611                          float *descent, float *externalLeading,
 612                          wxFont *theFont, bool use16bit) const
 613 {
 614     wxCoord x1, y1, descent1, externalLeading1;
 615     GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
 616     *x = x1; *y = y1;
 617     if (descent)
 618         *descent = descent1;
 619     if (externalLeading)
 620         *externalLeading = externalLeading1;
 621 }
 622 #endif
 623
 624 // ---------------------------------------------------------------------------
 625 // spline drawing code
 626 // ---------------------------------------------------------------------------
 627
 628 #if wxUSE_SPLINES
 629
 630 class wxSpline: public wxObject
 631 {
 632 public:
 633     int type;
 634     wxList *points;
 635
 636     wxSpline(wxList *list);
 637     void DeletePoints();
 638
 639     // Doesn't delete points
 640     ~wxSpline();
 641 };
 642
 643 void wx_draw_open_spline(wxDC *dc, wxSpline *spline);
 644
 645 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
 646                          double a3, double b3, double a4, double b4);
 647 void wx_clear_stack();
 648 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
 649                   double *y3, double *x4, double *y4);
 650 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
 651                     double x4, double y4);
 652 static bool wx_spline_add_point(double x, double y);
 653 static void wx_spline_draw_point_array(wxDC *dc);
 654 wxSpline *wx_make_spline(int x1, int y1, int x2, int y2, int x3, int y3);
 655
 656 void wxDC::DoDrawSpline(wxList *list)
 657 {
 658     wxSpline spline(list);
 659
 660     wx_draw_open_spline(this, &spline);
 661 }
 662
 663 wxList wx_spline_point_list;
 664
 665 void wx_draw_open_spline(wxDC *dc, wxSpline *spline)
 666 {
 667     wxPoint *p;
 668     double           cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
 669     double           x1, y1, x2, y2;
 670
 671     wxNode *node = spline->points->First();
 672     p = (wxPoint *)node->Data();
 673
 674     x1 = p->x;
 675     y1 = p->y;
 676
 677     node = node->Next();
 678     p = (wxPoint *)node->Data();
 679
 680     x2 = p->x;
 681     y2 = p->y;
 682     cx1 = (double)((x1 + x2) / 2);
 683     cy1 = (double)((y1 + y2) / 2);
 684     cx2 = (double)((cx1 + x2) / 2);
 685     cy2 = (double)((cy1 + y2) / 2);
 686
 687     wx_spline_add_point(x1, y1);
 688
 689     while ((node = node->Next()) != NULL)
 690     {
 691         p = (wxPoint *)node->Data();
 692         x1 = x2;
 693         y1 = y2;
 694         x2 = p->x;
 695         y2 = p->y;
 696         cx4 = (double)(x1 + x2) / 2;
 697         cy4 = (double)(y1 + y2) / 2;
 698         cx3 = (double)(x1 + cx4) / 2;
 699         cy3 = (double)(y1 + cy4) / 2;
 700
 701         wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
 702
 703         cx1 = cx4;
 704         cy1 = cy4;
 705         cx2 = (double)(cx1 + x2) / 2;
 706         cy2 = (double)(cy1 + y2) / 2;
 707     }
 708
 709     wx_spline_add_point((double)wx_round(cx1), (double)wx_round(cy1));
 710     wx_spline_add_point(x2, y2);
 711
 712     wx_spline_draw_point_array(dc);
 713
 714 }
 715
 716 /********************* CURVES FOR SPLINES *****************************
 717
 718   The following spline drawing routine is from
 719
 720     "An Algorithm for High-Speed Curve Generation"
 721     by George Merrill Chaikin,
 722     Computer Graphics and Image Processing, 3, Academic Press,
 723     1974, 346-349.
 724
 725       and
 726
 727         "On Chaikin's Algorithm" by R. F. Riesenfeld,
 728         Computer Graphics and Image Processing, 4, Academic Press,
 729         1975, 304-310.
 730
 731 ***********************************************************************/
 732
 733 #define     half(z1, z2)    ((z1+z2)/2.0)
 734 #define     THRESHOLD   5
 735
 736 /* iterative version */
 737
 738 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
 739                          double b4)
 740 {
 741     register double  xmid, ymid;
 742     double           x1, y1, x2, y2, x3, y3, x4, y4;
 743
 744     wx_clear_stack();
 745     wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
 746
 747     while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
 748         xmid = (double)half(x2, x3);
 749         ymid = (double)half(y2, y3);
 750         if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
 751             fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
 752             wx_spline_add_point((double)wx_round(x1), (double)wx_round(y1));
 753             wx_spline_add_point((double)wx_round(xmid), (double)wx_round(ymid));
 754         } else {
 755             wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
 756                 (double)half(x3, x4), (double)half(y3, y4), x4, y4);
 757             wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
 758                 (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
 759         }
 760     }
 761 }
 762
 763
 764 /* utilities used by spline drawing routines */
 765
 766
 767 typedef struct wx_spline_stack_struct {
 768     double           x1, y1, x2, y2, x3, y3, x4, y4;
 769 }
 770 Stack;
 771
 772 #define         SPLINE_STACK_DEPTH             20
 773 static Stack    wx_spline_stack[SPLINE_STACK_DEPTH];
 774 static Stack   *wx_stack_top;
 775 static int      wx_stack_count;
 776
 777 void wx_clear_stack()
 778 {
 779     wx_stack_top = wx_spline_stack;
 780     wx_stack_count = 0;
 781 }
 782
 783 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
 784 {
 785     wx_stack_top->x1 = x1;
 786     wx_stack_top->y1 = y1;
 787     wx_stack_top->x2 = x2;
 788     wx_stack_top->y2 = y2;
 789     wx_stack_top->x3 = x3;
 790     wx_stack_top->y3 = y3;
 791     wx_stack_top->x4 = x4;
 792     wx_stack_top->y4 = y4;
 793     wx_stack_top++;
 794     wx_stack_count++;
 795 }
 796
 797 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
 798                   double *x3, double *y3, double *x4, double *y4)
 799 {
 800     if (wx_stack_count == 0)
 801         return (0);
 802     wx_stack_top--;
 803     wx_stack_count--;
 804     *x1 = wx_stack_top->x1;
 805     *y1 = wx_stack_top->y1;
 806     *x2 = wx_stack_top->x2;
 807     *y2 = wx_stack_top->y2;
 808     *x3 = wx_stack_top->x3;
 809     *y3 = wx_stack_top->y3;
 810     *x4 = wx_stack_top->x4;
 811     *y4 = wx_stack_top->y4;
 812     return (1);
 813 }
 814
 815 static bool wx_spline_add_point(double x, double y)
 816 {
 817     wxPoint *point = new wxPoint;
 818     point->x = (int) x;
 819     point->y = (int) y;
 820     wx_spline_point_list.Append((wxObject*)point);
 821     return TRUE;
 822 }
 823
 824 static void wx_spline_draw_point_array(wxDC *dc)
 825 {
 826     dc->DrawLines(&wx_spline_point_list, 0, 0);
 827     wxNode *node = wx_spline_point_list.First();
 828     while (node)
 829     {
 830         wxPoint *point = (wxPoint *)node->Data();
 831         delete point;
 832         delete node;
 833         node = wx_spline_point_list.First();
 834     }
 835 }
 836
 837 wxSpline::wxSpline(wxList *list)
 838 {
 839     points = list;
 840 }
 841
 842 wxSpline::~wxSpline()
 843 {
 844 }
 845
 846 void wxSpline::DeletePoints()
 847 {
 848     for(wxNode *node = points->First(); node; node = points->First())
 849     {
 850         wxPoint *point = (wxPoint *)node->Data();
 851         delete point;
 852         delete node;
 853     }
 854     delete points;
 855 }
 856
 857
 858 #endif // wxUSE_SPLINES
 859