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     IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
  35
  36 // ---------------------------------------------------------------------------
  37 // constants
  38 // ---------------------------------------------------------------------------
  39
  40 static const int VIEWPORT_EXTENT = 1000;
  41
  42 static const int MM_POINTS = 9;
  43 static const int MM_METRIC = 10;
  44
  45 // usually this is defined in math.h
  46 #ifndef M_PI
  47     static const double M_PI = 3.14159265358979323846;
  48 #endif // M_PI
  49
  50 // ---------------------------------------------------------------------------
  51 // private functions
  52 // ---------------------------------------------------------------------------
  53
  54 // convert degrees to radians
  55 static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
  56
  57 int SetTextColor(
  58   HPS                               hPS
  59 , int                               nForegroundColour
  60 )
  61 {
  62     CHARBUNDLE                      vCbnd;
  63
  64     vCbnd.lColor =  nForegroundColour;
  65     ::GpiSetAttrs( hPS       // presentation-space handle
  66                   ,PRIM_CHAR // Char primitive.
  67                   ,CBB_COLOR // sets color.
  68                   ,0         //
  69                   ,&vCbnd    // buffer for attributes.
  70                  );
  71     return 0;
  72 }
  73
  74 int QueryTextBkColor(
  75   HPS                               hPS
  76 )
  77 {
  78     CHARBUNDLE                      vCbnd;
  79
  80     ::GpiQueryAttrs( hPS            // presentation-space handle
  81                     ,PRIM_CHAR      // Char primitive.
  82                     ,CBB_BACK_COLOR // Background color.
  83                     ,&vCbnd         // buffer for attributes.
  84                    );
  85     return vCbnd.lBackColor;
  86 }
  87
  88
  89 int SetTextBkColor(
  90   HPS                               hPS
  91 , int                               nBackgroundColour
  92 )
  93 {
  94     CHARBUNDLE                      vCbnd;
  95     int                             rc;
  96
  97     rc =  QueryTextBkColor(hPS);
  98
  99     vCbnd.lBackColor = nBackgroundColour;
 100     ::GpiSetAttrs(hPS,            // presentation-space handle
 101                   PRIM_CHAR,      // Char primitive.
 102                   CBB_BACK_COLOR, // sets color.
 103                   0,
 104                   &vCbnd          // buffer for attributes.
 105                  );
 106     return rc;
 107 }
 108
 109 int SetBkMode(
 110   HPS                               hPS
 111 , int                               nBackgroundMode
 112 )
 113 {
 114     if(nBackgroundMode == wxTRANSPARENT)
 115         ::GpiSetBackMix( hPS
 116                         ,BM_LEAVEALONE
 117                        );
 118     else
 119         // the background of the primitive takes  over whatever is underneath.
 120         ::GpiSetBackMix( hPS
 121                         ,BM_OVERPAINT
 122                         );
 123     return 0;
 124 }
 125
 126 // ===========================================================================
 127 // implementation
 128 // ===========================================================================
 129
 130 // ---------------------------------------------------------------------------
 131 // wxDC
 132 // ---------------------------------------------------------------------------
 133
 134 wxDC::wxDC(void)
 135 {
 136     m_pCanvas      = NULL;
 137
 138     m_hOldBitmap   = 0;
 139     m_hOldPen      = 0;
 140     m_hOldBrush    = 0;
 141     m_hOldFont     = 0;
 142     m_hOldPalette  = 0;
 143
 144     m_bOwnsDC      = FALSE;
 145     m_hDC          = 0;
 146     m_nDCCount     = 0;
 147     m_hOldPS       = NULL;
 148     m_hPS          = NULL;
 149     m_bIsPaintTime = FALSE;// True at Paint Time
 150 };
 151
 152 wxDC::~wxDC(void)
 153 {
 154     // TODO:
 155 };
 156
 157 // This will select current objects out of the DC,
 158 // which is what you have to do before deleting the
 159 // DC.
 160 void wxDC::SelectOldObjects(WXHDC dc)
 161 {
 162     if (dc)
 163     {
 164         if (m_hOldBitmap)
 165         {
 166 //            ::SelectObject((HDC) dc, (HBITMAP) m_oldBitmap);
 167             if (m_vSelectedBitmap.Ok())
 168             {
 169                 m_vSelectedBitmap.SetSelectedInto(NULL);
 170             }
 171         }
 172         m_hOldBitmap = 0;
 173         if (m_hOldPen)
 174         {
 175 //            ::SelectObject((HDC) dc, (HPEN) m_oldPen);
 176         }
 177         m_hOldPen = 0;
 178         if (m_hOldBrush)
 179         {
 180 //            ::SelectObject((HDC) dc, (HBRUSH) m_oldBrush);
 181         }
 182         m_hOldBrush = 0;
 183         if (m_hOldFont)
 184         {
 185 //            ::SelectObject((HDC) dc, (HFONT) m_oldFont);
 186         }
 187         m_hOldFont = 0;
 188         if (m_hOldPalette)
 189         {
 190 //            ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, TRUE);
 191         }
 192         m_hOldPalette = 0;
 193     }
 194
 195     m_brush           = wxNullBrush;
 196     m_pen             = wxNullPen;
 197     m_palette         = wxNullPalette;
 198     m_font            = wxNullFont;
 199     m_backgroundBrush = wxNullBrush;
 200     m_vSelectedBitmap = wxNullBitmap;
 201 }
 202
 203 // ---------------------------------------------------------------------------
 204 // clipping
 205 // ---------------------------------------------------------------------------
 206
 207 #define DO_SET_CLIPPING_BOX()                    \
 208 {                                                \
 209     RECTL rect;                                  \
 210                                                  \
 211     ::GpiQueryClipBox(m_hPS, &rect);             \
 212                                                  \
 213     m_clipX1 = (wxCoord) XDEV2LOG(rect.xLeft);   \
 214     m_clipY1 = (wxCoord) YDEV2LOG(rect.yTop);    \
 215     m_clipX2 = (wxCoord) XDEV2LOG(rect.xRight);  \
 216     m_clipY2 = (wxCoord) YDEV2LOG(rect.yBottom); \
 217 }
 218
 219 void wxDC::DoSetClippingRegion(
 220   wxCoord                           x
 221 , wxCoord                           y
 222 , wxCoord                           width
 223 , wxCoord                           height
 224 )
 225 {
 226     RECTL                           vRect;
 227
 228     m_clipping    = TRUE;
 229     vRect.xLeft   = XLOG2DEV(x);
 230     vRect.yTop    = YLOG2DEV(y + height);
 231     vRect.xRight  = XLOG2DEV(x + width);
 232     vRect.yBottom = YLOG2DEV(y);
 233     ::GpiIntersectClipRectangle(m_hPS, &vRect);
 234     DO_SET_CLIPPING_BOX()
 235 } // end of wxDC::DoSetClippingRegion
 236
 237 void wxDC::DoSetClippingRegionAsRegion(
 238   const wxRegion&                   rRegion
 239 )
 240 {
 241      wxCHECK_RET(rRegion.GetHRGN(), wxT("invalid clipping region"));
 242      HRGN                           hRgnOld;
 243
 244      m_clipping = TRUE;
 245      ::GpiSetClipRegion( m_hPS
 246                         ,(HRGN)rRegion.GetHRGN()
 247                         ,&hRgnOld
 248                        );
 249     DO_SET_CLIPPING_BOX()
 250 } // end of wxDC::DoSetClippingRegionAsRegion
 251
 252 void wxDC::DestroyClippingRegion(void)
 253 {
 254     if (m_clipping && m_hPS)
 255     {
 256          HRGN                       hRgnOld;
 257          RECTL                      vRect;
 258
 259          // TODO: this should restore the previous clipped region
 260          //       so that OnPaint processing works correctly, and
 261          //       the update doesn't get destroyed after the first
 262          //       DestroyClippingRegion
 263          vRect.xLeft   = XLOG2DEV(0);
 264          vRect.yTop    = YLOG2DEV(32000);
 265          vRect.xRight  = XLOG2DEV(32000);
 266          vRect.yBottom = YLOG2DEV(0);
 267
 268          HRGN                       hRgn = ::GpiCreateRegion(m_hPS, 1, &vRect);
 269
 270          ::GpiSetClipRegion(m_hPS, hRgn, &hRgnOld);
 271      }
 272       m_clipping = FALSE;
 273 } // end of wxDC::DestroyClippingRegion
 274
 275 // ---------------------------------------------------------------------------
 276 // query capabilities
 277 // ---------------------------------------------------------------------------
 278
 279 bool wxDC::CanDrawBitmap() const
 280 {
 281     return TRUE;
 282 }
 283
 284 bool wxDC::CanGetTextExtent() const
 285 {
 286     // What sort of display is it?
 287     int technology = 0; // TODO:  ::GetDeviceCaps(GetHdc(), TECHNOLOGY);
 288
 289     // TODO: return (technology == DT_RASDISPLAY) || (technology == DT_RASPRINTER);
 290     return FALSE;
 291 }
 292
 293 int wxDC::GetDepth() const
 294 {
 295    // TODO:
 296    return (1);
 297 }
 298
 299 // ---------------------------------------------------------------------------
 300 // drawing
 301 // ---------------------------------------------------------------------------
 302
 303 void wxDC::Clear()
 304 {
 305     ::GpiErase(m_hPS);
 306 }
 307
 308 void wxDC::DoFloodFill(
 309   wxCoord                           vX
 310 , wxCoord                           vY
 311 , const wxColour&                   rCol
 312 , int                               nStyle
 313 )
 314 {
 315     POINTL                          vPtlPos;
 316     LONG                            lColor;
 317     LONG                            lOptions;
 318
 319     vPtlPos.x = vX;             // Loads x-coordinate
 320     vPtlPos.y = vY;             // Loads y-coordinate
 321     ::GpiMove(m_hPS, &vPtlPos); // Sets current position
 322     lColor = rCol.GetPixel();
 323     lOptions = FF_BOUNDARY;
 324     if(wxFLOOD_SURFACE == nStyle)
 325         lOptions = FF_SURFACE;
 326
 327     ::GpiFloodFill(m_hPS, lOptions, lColor);
 328 }
 329
 330 bool wxDC::DoGetPixel(
 331   wxCoord                           vX
 332 , wxCoord                           vY
 333 , wxColour*                         pCol
 334 ) const
 335 {
 336     POINTL                          vPoint;
 337     LONG                            lColor;
 338
 339     vPoint.x = vX;
 340     vPoint.y = vY;
 341     lColor = ::GpiSetPel(m_hPS, &vPoint);
 342     pCol->Set((unsigned long)lColor);
 343     if(lColor>= 0)
 344         return(TRUE);
 345     else
 346         return(FALSE);
 347 }
 348
 349 void wxDC::DoCrossHair(wxCoord x, wxCoord y)
 350 {
 351    // TODO
 352 }
 353
 354 void wxDC::DoDrawLine(
 355   wxCoord                           vX1
 356 , wxCoord                           vY1
 357 , wxCoord                           vX2
 358 , wxCoord                           vY2
 359 )
 360 {
 361     POINTL                          vPoint[2];
 362
 363     vPoint[0].x = vX1;
 364     vPoint[0].y = vY1;
 365     vPoint[1].x = vX2;
 366     vPoint[1].y = vY2;
 367     // ::GpiSetColor(m_hPS,CLR_RED); //DEbug
 368     ::GpiMove(m_hPS, &vPoint[0]);
 369     ::GpiLine(m_hPS, &vPoint[1]);
 370 }
 371
 372 //////////////////////////////////////////////////////////////////////////////
 373 // Draws an arc of a circle, centred on (xc, yc), with starting point (x1, y1)
 374 // and ending at (x2, y2). The current pen is used for the outline and the
 375 // current brush for filling the shape. The arc is drawn in an anticlockwise
 376 // direction from the start point to the end point.
 377 //////////////////////////////////////////////////////////////////////////////
 378 void wxDC::DoDrawArc(
 379   wxCoord                           vX1
 380 , wxCoord                           vY1
 381 , wxCoord                           vX2
 382 , wxCoord                           vY2
 383 , wxCoord                           vXc
 384 , wxCoord                           vYc
 385 )
 386 {
 387      POINTL                         vPtlPos;
 388      POINTL                         vPtlArc[2]; // Structure for current position
 389      int                            nDx;
 390      int                            nDy;
 391      double                         dRadius;
 392      double                         dAngl1;
 393      double                         dAngl2;
 394      double                         dAnglmid;
 395      wxCoord                        vXm;
 396      wxCoord                        vYm;
 397      ARCPARAMS                      vArcp; // Structure for arc parameters
 398
 399     if((vX1 == vXc && vY1 == vXc) || (vX2 == vXc && vY2 == vXc))
 400         return; // Draw point ??
 401     dRadius = 0.5 * ( hypot( (double)(vY1 - vYc)
 402                             ,(double)(vX1 - vXc)
 403                            ) +
 404                       hypot( (double)(vY2 - vYc)
 405                             ,(double)(vX2 - vXc)
 406                            )
 407                      );
 408
 409     dAngl1 = atan2( (double)(vY1 - vYc)
 410                    ,(double)(vX1 - vXc)
 411                   );
 412     dAngl2 = atan2( (double)(vY2 - vYc)
 413                    ,(double)(vX2 - vXc)
 414                   );
 415     if(dAngl2 < dAngl1)
 416         dAngl2 += M_PI * 2;
 417
 418     //
 419     // GpiPointArc can't draw full arc
 420     //
 421      if(dAngl2 == dAngl1 || (vX1 == vX2 && vY1 == vY2) )
 422      {
 423         //
 424         // Medium point
 425         //
 426         dAnglmid = (dAngl1 + dAngl2)/2. + M_PI;
 427         vXm      = vXc + dRadius * cos(dAnglmid);
 428         vYm      = vYc + dRadius * sin(dAnglmid);
 429         DoDrawArc( vX1
 430                   ,vY1
 431                   ,vXm
 432                   ,vYm
 433                   ,vXc
 434                   ,vYc
 435                  );
 436         DoDrawArc( vXm
 437                   ,vYm
 438                   ,vX2
 439                   ,vY2
 440                   ,vXc
 441                   ,vYc
 442                  );
 443         return;
 444     }
 445
 446     //
 447     // Medium point
 448     //
 449     dAnglmid = (dAngl1 + dAngl2)/2.;
 450     vXm      = vXc + dRadius * cos(dAnglmid);
 451     vYm      = vYc + dRadius * sin(dAnglmid);
 452
 453     //
 454     // Ellipse main axis (r,q), (p,s) with center at (0,0) */
 455     //
 456     vArcp.lR = 0;
 457     vArcp.lQ = 1;
 458     vArcp.lP = 1;
 459     vArcp.lS = 0;
 460     ::GpiSetArcParams(m_hPS, &vArcp); // Sets parameters to default
 461
 462     vPtlPos.x = vX1; // Loads x-coordinate
 463     vPtlPos.y = vY1; // Loads y-coordinate
 464     ::GpiMove(m_hPS, &vPtlPos); // Sets current position
 465     vPtlArc[0].x =  vXm;
 466     vPtlArc[0].y =  vYm;
 467     vPtlArc[1].x = vX2;
 468     vPtlArc[1].y = vY2;
 469     ::GpiPointArc(m_hPS, vPtlArc); // Draws the arc
 470 }
 471
 472 void wxDC::DoDrawCheckMark(
 473   wxCoord                           vX1
 474 , wxCoord                           vY1
 475 , wxCoord                           vWidth
 476 , wxCoord                           vHeight
 477 )
 478 {
 479     POINTL                          vPoint[2];
 480
 481     vPoint[0].x = vX1;
 482     vPoint[0].y = vY1;
 483     vPoint[1].x = vX1 + vWidth;
 484     vPoint[1].y = vY1 + vHeight;
 485
 486     ::GpiMove(m_hPS, &vPoint[0]);
 487     ::GpiBox( m_hPS       // handle to a presentation space
 488              ,DRO_OUTLINE // draw the box outline ? or ?
 489              ,&vPoint[1]  // address of the corner
 490              ,0L          // horizontal corner radius
 491              ,0L          // vertical corner radius
 492             );
 493     if(vWidth > 4 && vHeight > 4)
 494     {
 495         int                         nTmp;
 496
 497         vPoint[0].x += 2; vPoint[0].y += 2;
 498         vPoint[1].x -= 2; vPoint[1].y -= 2;
 499         ::GpiMove(m_hPS, &vPoint[0]);
 500         ::GpiLine(m_hPS, &vPoint[1]);
 501         nTmp = vPoint[0].x;
 502         vPoint[0].x = vPoint[1].x;
 503         vPoint[1].x = nTmp;
 504         ::GpiMove(m_hPS, &vPoint[0]);
 505         ::GpiLine(m_hPS, &vPoint[1]);
 506     }
 507 }
 508
 509 void wxDC::DoDrawPoint(
 510   wxCoord                           vX
 511 , wxCoord                           vY
 512 )
 513 {
 514     POINTL                          vPoint;
 515
 516     vPoint.x = vX;
 517     vPoint.y = vY;
 518     ::GpiSetPel(m_hPS, &vPoint);
 519 }
 520
 521 void wxDC::DoDrawPolygon(
 522   int                               n
 523 , wxPoint                           vPoints[]
 524 , wxCoord                           vXoffset
 525 , wxCoord                           vYoffset
 526 , int                               nFillStyle
 527 )
 528 {
 529     ULONG                           ulCount = 1;    // Number of polygons.
 530     POLYGON                         vPlgn;          // polygon.
 531     ULONG                           flOptions = 0L; // Drawing options.
 532
 533 //////////////////////////////////////////////////////////////////////////////
 534 // This contains fields of option bits... to draw boundary lines as well as
 535 // the area interior.
 536 //
 537 // Drawing boundary lines:
 538 //   POLYGON_NOBOUNDARY              Does not draw boundary lines.
 539 //   POLYGON_BOUNDARY                Draws boundary lines (the default).
 540 //
 541 // Construction of the area interior:
 542 //   POLYGON_ALTERNATE               Constructs interior in alternate mode
 543 //                                   (the default).
 544 //   POLYGON_WINDING                 Constructs interior in winding mode.
 545 //////////////////////////////////////////////////////////////////////////////
 546
 547     ULONG                           flModel = 0L; // Drawing model.
 548
 549 //////////////////////////////////////////////////////////////////////////////
 550 // Drawing model.
 551 //   POLYGON_INCL  Fill is inclusive of bottom right (the default).
 552 //   POLYGON_EXCL  Fill is exclusive of bottom right.
 553 //       This is provided to aid migration from other graphics models.
 554 //////////////////////////////////////////////////////////////////////////////
 555
 556     LONG                            lHits = 0L; // Correlation/error indicator.
 557     POINTL                          vPoint;
 558     int                             i;
 559     int                             nIsTRANSPARENT = 0;
 560     LONG                            lBorderColor = 0L;
 561     LONG                            lColor = 0L;
 562
 563     lBorderColor = m_pen.GetColour().GetPixel();
 564     lColor       = m_brush.GetColour().GetPixel();
 565     if(m_brush.GetStyle() == wxTRANSPARENT)
 566         nIsTRANSPARENT = 1;
 567
 568     vPlgn.ulPoints = n;
 569     vPlgn.aPointl = (POINTL*) calloc( n + 1
 570                                      ,sizeof(POINTL)
 571                                     ); // well, new will call malloc
 572
 573     for(i = 0; i < n; i++)
 574     {
 575         vPlgn.aPointl[i].x = vPoints[i].x; // +xoffset;
 576         vPlgn.aPointl[i].y = vPoints[i].y; // +yoffset;
 577     }
 578     flModel = POLYGON_BOUNDARY;
 579     if(nFillStyle == wxWINDING_RULE)
 580         flModel |= POLYGON_WINDING;
 581     else
 582         flModel |= POLYGON_ALTERNATE;
 583
 584     vPoint.x = vXoffset;
 585     vPoint.y = vYoffset;
 586
 587     ::GpiSetColor(m_hPS, lBorderColor);
 588     ::GpiMove(m_hPS, &vPoint);
 589     lHits = ::GpiPolygons(m_hPS, ulCount, &vPlgn, flOptions, flModel);
 590     free(vPlgn.aPointl);
 591 }
 592
 593 void wxDC::DoDrawLines(
 594   int                               n
 595 , wxPoint                           vPoints[]
 596 , wxCoord                           vXoffset
 597 , wxCoord                           vYoffset
 598 )
 599 {
 600     int                             i;
 601     POINTL                          vPoint;
 602
 603     vPoint.x = vPoints[0].x + vXoffset;
 604     vPoint.y = vPoints[0].y + vYoffset;
 605     ::GpiMove(m_hPS, &vPoint);
 606
 607     LONG                            lBorderColor = m_pen.GetColour().GetPixel();
 608
 609     ::GpiSetColor(m_hPS, lBorderColor);
 610     for(i = 1; i < n; i++)
 611     {
 612         vPoint.x = vPoints[0].x + vXoffset;
 613         vPoint.y = vPoints[0].y + vYoffset;
 614         ::GpiLine(m_hPS, &vPoint);
 615     }
 616 }
 617
 618 void wxDC::DoDrawRectangle(
 619   wxCoord                           vX
 620 , wxCoord                           vY
 621 , wxCoord                           vWidth
 622 , wxCoord                           vHeight
 623 )
 624 {
 625     POINTL                          vPoint[2];
 626     LONG                            lControl;
 627     LONG                            lColor;
 628     LONG                            lBorderColor;
 629     int                             nIsTRANSPARENT = 0;
 630
 631     vPoint[0].x = vX;
 632     vPoint[0].y = vY;
 633     vPoint[1].x = vX + vWidth;
 634     vPoint[1].y = vY - vHeight;      //mustdie !!! ??
 635     ::GpiMove(m_hPS, &vPoint[0]);
 636     lColor       = m_brush.GetColour().GetPixel();
 637     lBorderColor = m_pen.GetColour().GetPixel();
 638     if (m_brush.GetStyle() == wxTRANSPARENT)
 639         nIsTRANSPARENT = 1;
 640     if(lColor == lBorderColor || nIsTRANSPARENT)
 641     {
 642         lControl = DRO_OUTLINEFILL; //DRO_FILL;
 643         if(m_brush.GetStyle() == wxTRANSPARENT)
 644             lControl = DRO_OUTLINE;
 645
 646 //EK    ::GpiSetColor(m_hPS,lBorderColor);
 647         ::GpiSetColor(m_hPS,CLR_GREEN);
 648         ::GpiBox( m_hPS       // handle to a presentation space
 649                  ,lControl   // draw the box outline ? or ?
 650                  ,&vPoint[1]  // address of the corner
 651                  ,0L          // horizontal corner radius
 652                  ,0L          // vertical corner radius
 653                 );
 654     }
 655     else
 656     {
 657         lControl = DRO_OUTLINE;
 658         ::GpiSetColor( m_hPS
 659                       ,lBorderColor
 660                      );
 661         ::GpiBox( m_hPS
 662                  ,lControl
 663                  ,&vPoint[1]
 664                  ,0L
 665                  ,0L
 666                 );
 667         lControl = DRO_FILL;
 668         ::GpiSetColor( m_hPS
 669                       ,lColor
 670                      );
 671         ::GpiBox( m_hPS
 672                  ,lControl
 673                  ,&vPoint[1]
 674                  ,0L
 675                  ,0L
 676                 );
 677     }
 678 }
 679
 680 void wxDC::DoDrawRoundedRectangle(
 681   wxCoord                           vX
 682 , wxCoord                           vY
 683 , wxCoord                           vWidth
 684 , wxCoord                           vHeight
 685 , double                            dRadius
 686 )
 687 {
 688     POINTL                          vPoint[2];
 689     LONG                            lControl;
 690
 691     vPoint[0].x = vX;
 692     vPoint[0].y = vY;
 693     vPoint[1].x = vX + vWidth;
 694     vPoint[1].y = vY + vHeight;
 695     ::GpiMove(m_hPS, &vPoint[0]);
 696
 697     lControl = DRO_OUTLINEFILL; //DRO_FILL;
 698     if (m_brush.GetStyle() == wxTRANSPARENT)
 699         lControl = DRO_OUTLINE;
 700     ::GpiBox( m_hPS         // handle to a presentation space
 701              ,DRO_OUTLINE   // draw the box outline ? or ?
 702              ,&vPoint[1]    // address of the corner
 703              ,(LONG)dRadius // horizontal corner radius
 704              ,(LONG)dRadius // vertical corner radius
 705             );
 706 }
 707
 708 // Draw Ellipse within box (x,y) - (x+width, y+height)
 709 void wxDC::DoDrawEllipse(
 710   wxCoord                           vX
 711 , wxCoord                           vY
 712 , wxCoord                           vWidth
 713 , wxCoord                           vHeight
 714 )
 715 {
 716     POINTL                          vPtlPos; // Structure for current position
 717     FIXED                           vFxMult; // Multiplier for ellipse
 718     ARCPARAMS                       vArcp;   // Structure for arc parameters
 719
 720     vArcp.lR = 0;
 721     vArcp.lQ = vHeight/2;
 722     vArcp.lP = vWidth/2;
 723     vArcp.lS = 0;
 724     ::GpiSetArcParams( m_hPS
 725                       ,&vArcp
 726                      ); // Sets parameters to default
 727     vPtlPos.x = vX + vWidth/2;  // Loads x-coordinate
 728     vPtlPos.y = vY + vHeight/2; // Loads y-coordinate
 729     ::GpiMove( m_hPS
 730               ,&vPtlPos
 731              ); // Sets current position
 732     vFxMult = MAKEFIXED(1, 0);             /* Sets multiplier            */
 733
 734     //
 735     // DRO_FILL, DRO_OTLINEFILL - where to get
 736     //
 737     ::GpiFullArc( m_hPS
 738                  ,DRO_OUTLINE
 739                  ,vFxMult
 740                 ); // Draws full arc with center at current position
 741 }
 742
 743 void wxDC::DoDrawEllipticArc(
 744   wxCoord                           vX
 745 , wxCoord                           vY
 746 , wxCoord                           vWidth
 747 , wxCoord                           vHeight
 748 , double                            dSa
 749 , double                            dEa
 750 )
 751 {
 752     POINTL                          vPtlPos; // Structure for current position
 753     FIXED                           vFxMult; // Multiplier for ellipse
 754     ARCPARAMS                       vArcp;   // Structure for arc parameters
 755     FIXED                           vFSa;
 756     FIXED                           vFSweepa; // Start angle, sweep angle
 757     double                          dIntPart;
 758     double                          dFractPart;
 759     double                          dRadius;
 760
 761     dFractPart = modf(dSa,&dIntPart);
 762     vFSa = MAKEFIXED((int)dIntPart, (int)(dFractPart * 0xffff) );
 763     dFractPart = modf(dEa - dSa, &dIntPart);
 764     vFSweepa = MAKEFIXED((int)dIntPart, (int)(dFractPart * 0xffff) );
 765
 766     //
 767     // Ellipse main axis (r,q), (p,s) with center at (0,0)
 768     //
 769     vArcp.lR = 0;
 770     vArcp.lQ = vHeight/2;
 771     vArcp.lP = vWidth/2;
 772     vArcp.lS = 0;
 773     ::GpiSetArcParams(m_hPS, &vArcp); // Sets parameters to default
 774     vPtlPos.x = vX + vWidth/2  * (1. + cos(DegToRad(dSa))); // Loads x-coordinate
 775     vPtlPos.y = vY + vHeight/2 * (1. + sin(DegToRad(dSa))); // Loads y-coordinate
 776     ::GpiMove(m_hPS, &vPtlPos); // Sets current position
 777
 778     //
 779     // May be not to the center ?
 780     //
 781     vPtlPos.x = vX + vWidth/2 ; // Loads x-coordinate
 782     vPtlPos.y = vY + vHeight/2; // Loads y-coordinate
 783     vFxMult = MAKEFIXED(1, 0);  // Sets multiplier
 784
 785     //
 786     // DRO_FILL, DRO_OTLINEFILL - where to get
 787     //
 788     ::GpiPartialArc( m_hPS
 789                     ,&vPtlPos
 790                     ,vFxMult
 791                     ,vFSa
 792                     ,vFSweepa
 793                    );
 794 }
 795
 796 void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 797 {
 798     // TODO:
 799 }
 800
 801 void wxDC::DoDrawBitmap( const wxBitmap &bmp
 802                         ,wxCoord x, wxCoord y
 803                         ,bool useMask
 804                        )
 805 {
 806    // TODO
 807 }
 808
 809 void wxDC::DoDrawText(
 810   const wxString&                   rsText
 811 , wxCoord                           vX
 812 , wxCoord                           vY
 813 )
 814 {
 815     DrawAnyText( rsText
 816                 ,vX
 817                 ,vY
 818                );
 819 }
 820
 821 void wxDC::DrawAnyText(
 822   const wxString&                   rsText
 823 , wxCoord                           vX
 824 , wxCoord                           vY
 825 )
 826 {
 827     int                             nOldBackground = 0;
 828     POINTL                          vPtlStart;
 829     LONG                            lHits;
 830
 831     //
 832     // prepare for drawing the text
 833     //
 834
 835     //
 836     // Set text color attributes
 837     //
 838     if (m_textForegroundColour.Ok())
 839     {
 840         SetTextColor( m_hPS
 841                      ,(int)m_textForegroundColour.GetPixel()
 842                     );
 843     }
 844
 845     if (m_textBackgroundColour.Ok())
 846     {
 847         nOldBackground = SetTextBkColor( m_hPS
 848                                         ,(int)m_textBackgroundColour.GetPixel()
 849                                        );
 850     }
 851     SetBkMode( m_hPS
 852               ,m_backgroundMode
 853              );
 854     vPtlStart.x = vX;
 855     vPtlStart.y = vY;
 856
 857     lHits = ::GpiCharStringAt( m_hPS
 858                               ,&vPtlStart
 859                               ,rsText.length()
 860                               ,(PCH)rsText.c_str()
 861                              );
 862     if (lHits != GPI_OK)
 863     {
 864         wxLogLastError(wxT("TextOut"));
 865     }
 866
 867     //
 868     // Restore the old parameters (text foreground colour may be left because
 869     // it never is set to anything else, but background should remain
 870     // transparent even if we just drew an opaque string)
 871     //
 872     if (m_textBackgroundColour.Ok())
 873             SetTextBkColor( m_hPS
 874                            ,nOldBackground
 875                           );
 876     SetBkMode( m_hPS
 877               ,wxTRANSPARENT
 878              );
 879 }
 880
 881 void wxDC::DoDrawRotatedText(
 882   const wxString&                   rsText
 883 , wxCoord                           vX
 884 , wxCoord                           vY
 885 , double                            dAngle
 886 )
 887 {
 888     if (dAngle == 0.0)
 889     {
 890         DoDrawText( rsText
 891                    ,vX
 892                    ,vY
 893                   );
 894     }
 895
 896    // TODO:
 897    /*
 898     if ( angle == 0.0 )
 899     {
 900         DoDrawText(text, x, y);
 901     }
 902     else
 903     {
 904         LOGFONT lf;
 905         wxFillLogFont(&lf, &m_font);
 906
 907         // GDI wants the angle in tenth of degree
 908         long angle10 = (long)(angle * 10);
 909         lf.lfEscapement = angle10;
 910         lf. lfOrientation = angle10;
 911
 912         HFONT hfont = ::CreateFontIndirect(&lf);
 913         if ( !hfont )
 914         {
 915             wxLogLastError("CreateFont");
 916         }
 917         else
 918         {
 919             HFONT hfontOld = ::SelectObject(GetHdc(), hfont);
 920
 921             DrawAnyText(text, x, y);
 922
 923             (void)::SelectObject(GetHdc(), hfontOld);
 924         }
 925
 926         // call the bounding box by adding all four vertices of the rectangle
 927         // containing the text to it (simpler and probably not slower than
 928         // determining which of them is really topmost/leftmost/...)
 929         wxCoord w, h;
 930         GetTextExtent(text, &w, &h);
 931
 932         double rad = DegToRad(angle);
 933
 934         // "upper left" and "upper right"
 935         CalcBoundingBox(x, y);
 936         CalcBoundingBox(x + w*cos(rad), y - h*sin(rad));
 937         CalcBoundingBox(x + h*sin(rad), y + h*cos(rad));
 938
 939         // "bottom left" and "bottom right"
 940         x += (wxCoord)(h*sin(rad));
 941         y += (wxCoord)(h*cos(rad));
 942         CalcBoundingBox(x, y);
 943         CalcBoundingBox(x + h*sin(rad), y + h*cos(rad));
 944     }
 945 */
 946 }
 947
 948 // ---------------------------------------------------------------------------
 949 // set GDI objects
 950 // ---------------------------------------------------------------------------
 951
 952 void wxDC::SetPalette(const wxPalette& palette)
 953 {
 954    // TODO
 955 }
 956
 957 void wxDC::SetFont(
 958   const wxFont&                     rFont
 959 )
 960 {
 961     //
 962     // Set the old object temporarily, in case the assignment deletes an object
 963     // that's not yet selected out.
 964     //
 965     if (m_hOldFont)
 966     {
 967 //        ::SelectObject(GetHdc(), (HFONT) m_hOldFont);
 968         m_hOldFont = 0;
 969     }
 970
 971     m_font = rFont;
 972
 973     if (!rFont.Ok())
 974     {
 975         if (m_hOldFont)
 976 //            ::SelectObject(GetHdc(), (HFONT) m_hOldFont);
 977         m_hOldFont = 0;
 978     }
 979
 980     if (m_font.Ok() && m_font.GetResourceHandle())
 981     {
 982         HFONT                       hFont = (HFONT)0; //::SelectObject(GetHdc(), (HFONT) m_font.GetResourceHandle());
 983         if (hFont == (HFONT) NULL)
 984         {
 985             wxLogDebug(wxT("::SelectObject failed in wxDC::SetFont."));
 986         }
 987         if (!m_hOldFont)
 988             m_hOldFont = (WXHFONT) hFont;
 989     }
 990 }
 991
 992 void wxDC::SetPen(
 993   const wxPen&                      rPen
 994 )
 995 {
 996     wxCHECK_RET( Ok(), wxT("invalid window dc") );
 997
 998     if (m_pen == rPen)
 999         return;
1000     m_pen = rPen;
1001     if (!m_pen.Ok())
1002         return;
1003
1004     int                             nWidth = m_pen.GetWidth();
1005
1006     if (nWidth <= 0)
1007     {
1008         nWidth = 1;
1009     }
1010     else
1011     {
1012         double                      dW = 0.5 +
1013                                        ( fabs((double) XLOG2DEVREL(nWidth)) +
1014                                          fabs((double) YLOG2DEVREL(nWidth))
1015                                        ) / 2.0;
1016         nWidth = (int)dW;
1017     }
1018     wxColour                        vColor = m_pen.GetColour();
1019
1020     ::GpiSetColor( m_hPS
1021                   ,vColor.GetPixel()
1022                  ); //DEbug ??
1023
1024     int                             nLinetype;
1025     int                             nStyle = m_pen.GetStyle();
1026
1027     nLinetype = LINETYPE_DEFAULT;
1028     switch(nStyle)
1029     {
1030         case wxDOT:
1031             nLinetype = LINETYPE_DOT;
1032             break;
1033
1034         case wxLONG_DASH:
1035             nLinetype = LINETYPE_LONGDASH;
1036             break;
1037
1038         case wxSHORT_DASH:
1039             nLinetype = LINETYPE_SHORTDASH;
1040             break;
1041
1042         case wxDOT_DASH:
1043             nLinetype = LINETYPE_DASHDOT;
1044             break;
1045
1046         case wxTRANSPARENT:
1047             nLinetype = LINETYPE_INVISIBLE;
1048             break;
1049
1050         case wxSOLID:
1051             nLinetype = LINETYPE_SOLID;
1052             break;
1053     }
1054     ::GpiSetLineType( m_hPS
1055                      ,nLinetype
1056                     );
1057
1058     nWidth =  m_pen.GetWidth();
1059     ::GpiSetLineWidth( m_hPS
1060                       ,MAKEFIXED( nWidth
1061                                  ,0
1062                                 )
1063                      );
1064 }
1065
1066 void wxDC::SetBrush(
1067   const wxBrush&                    rBrush
1068 )
1069 {
1070    // TODO
1071 }
1072
1073 void wxDC::SetBackground(const wxBrush& brush)
1074 {
1075    // TODO
1076 }
1077
1078 void wxDC::SetBackgroundMode(
1079   int                               nMode
1080 )
1081 {
1082     m_backgroundMode = nMode;
1083 }
1084
1085 void wxDC::SetLogicalFunction(int function)
1086 {
1087    // TODO
1088 }
1089
1090 void wxDC::SetRop(WXHDC dc)
1091 {
1092     if (!dc || m_logicalFunction < 0)
1093         return;
1094
1095     int c_rop;
1096     // These may be wrong
1097     switch (m_logicalFunction)
1098     {
1099 // TODO: Figure this stuff out
1100         //    case wxXOR: c_rop = R2_XORPEN; break;
1101 //    case wxXOR: c_rop = R2_NOTXORPEN; break;
1102 //    case wxINVERT: c_rop = R2_NOT; break;
1103 //    case wxOR_REVERSE: c_rop = R2_MERGEPENNOT; break;
1104 //    case wxAND_REVERSE: c_rop = R2_MASKPENNOT; break;
1105 //    case wxCLEAR: c_rop = R2_WHITE; break;
1106 //    case wxSET: c_rop = R2_BLACK; break;
1107 //    case wxSRC_INVERT: c_rop = R2_NOTCOPYPEN; break;
1108 //    case wxOR_INVERT: c_rop = R2_MERGENOTPEN; break;
1109 //    case wxAND: c_rop = R2_MASKPEN; break;
1110 //    case wxOR: c_rop = R2_MERGEPEN; break;
1111 //    case wxAND_INVERT: c_rop = R2_MASKNOTPEN; break;
1112 //    case wxEQUIV:
1113 //    case wxNAND:
1114 //    case wxCOPY:
1115     default:
1116 //      c_rop = R2_COPYPEN;
1117         break;
1118     }
1119 //    SetROP2((HDC) dc, c_rop);
1120 }
1121
1122 bool wxDC::StartDoc(const wxString& message)
1123 {
1124     // We might be previewing, so return TRUE to let it continue.
1125     return TRUE;
1126 }
1127
1128 void wxDC::EndDoc()
1129 {
1130 }
1131
1132 void wxDC::StartPage()
1133 {
1134 }
1135
1136 void wxDC::EndPage()
1137 {
1138 }
1139
1140 // ---------------------------------------------------------------------------
1141 // text metrics
1142 // ---------------------------------------------------------------------------
1143
1144 wxCoord wxDC::GetCharHeight() const
1145 {
1146     // TODO
1147     return(8);
1148 }
1149
1150 wxCoord wxDC::GetCharWidth() const
1151 {
1152     // TODO
1153     return(8);
1154 }
1155
1156 void wxDC::DoGetTextExtent(
1157   const wxString&                   rsString
1158 , wxCoord*                          pvX
1159 , wxCoord*                          pvY
1160 , wxCoord*                          pvDescent
1161 , wxCoord*                          pvExternalLeading
1162 , wxFont*                           pTheFont
1163 ) const
1164 {
1165     POINTL                          avPoint[TXTBOX_COUNT];
1166     POINTL                          vPtMin;
1167     POINTL                          vPtMax;
1168     int                             i;
1169     int                             l;
1170     FONTMETRICS                     vFM; // metrics structure
1171     BOOL                            bRc;
1172     char*                           pStr;
1173     ERRORID                         vErrorCode; // last error id code
1174     wxFont*                         pFontToUse = (wxFont*)pTheFont;
1175
1176     if (!pFontToUse)
1177         pFontToUse = (wxFont*)&m_font;
1178     l = rsString.length();
1179     pStr = (PCH) rsString.c_str();
1180
1181     //
1182     // In world coordinates.
1183     //
1184     bRc = ::GpiQueryTextBox( m_hPS
1185                             ,l
1186                             ,pStr
1187                             ,TXTBOX_COUNT // return maximum information
1188                             ,avPoint      // array of coordinates points
1189                            );
1190     if(!bRc)
1191     {
1192        vErrorCode = ::WinGetLastError(wxGetInstance());
1193     }
1194
1195     vPtMin.x = avPoint[0].x;
1196     vPtMax.x = avPoint[0].x;
1197     vPtMin.y = avPoint[0].y;
1198     vPtMax.y = avPoint[0].y;
1199     for (i = 1; i < 4; i++)
1200     {
1201         if(vPtMin.x > avPoint[i].x) vPtMin.x = avPoint[i].x;
1202         if(vPtMin.y > avPoint[i].y) vPtMin.y = avPoint[i].y;
1203         if(vPtMax.x < avPoint[i].x) vPtMax.x = avPoint[i].x;
1204         if(vPtMax.y < avPoint[i].y) vPtMax.y = avPoint[i].y;
1205     }
1206     ::GpiQueryFontMetrics( m_hPS
1207                           ,sizeof(FONTMETRICS)
1208                           ,&vFM
1209                          );
1210
1211     if (pvX)
1212         *pvX = (wxCoord)(vPtMax.x - vPtMin.x + 1);
1213     if (pvY)
1214         *pvY = (wxCoord)(vPtMax.y - vPtMin.y + 1);
1215     if (pvDescent)
1216         *pvDescent = vFM.lMaxDescender;
1217     if (pvExternalLeading)
1218         *pvExternalLeading = vFM.lExternalLeading;
1219 }
1220
1221 void wxDC::SetMapMode( int mode )
1222 {
1223     // TODO:
1224 };
1225
1226 void wxDC::SetUserScale(double x, double y)
1227 {
1228     m_userScaleX = x;
1229     m_userScaleY = y;
1230
1231     SetMapMode(m_mappingMode);
1232 }
1233
1234 void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
1235 {
1236     m_signX = xLeftRight ? 1 : -1;
1237     m_signY = yBottomUp ? -1 : 1;
1238
1239     SetMapMode(m_mappingMode);
1240 }
1241
1242 void wxDC::SetSystemScale(double x, double y)
1243 {
1244     m_scaleX = x;
1245     m_scaleY = y;
1246
1247     SetMapMode(m_mappingMode);
1248 }
1249
1250 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
1251 {
1252     // TODO:
1253 };
1254
1255 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
1256 {
1257     // TODO:
1258 };
1259
1260 // ---------------------------------------------------------------------------
1261 // coordinates transformations
1262 // ---------------------------------------------------------------------------
1263
1264 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
1265 {
1266     return (wxCoord) (((x) - m_deviceOriginX)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX) - m_logicalOriginX);
1267 }
1268
1269 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
1270 {
1271     return (wxCoord) ((x)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX));
1272 }
1273
1274 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
1275 {
1276     return (wxCoord) (((y) - m_deviceOriginY)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY) - m_logicalOriginY);
1277 }
1278
1279 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
1280 {
1281     return (wxCoord) ((y)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY));
1282 }
1283
1284 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
1285 {
1286     return (wxCoord) ((x - m_logicalOriginX)*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX + m_deviceOriginX);
1287 }
1288
1289 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
1290 {
1291     return (wxCoord) (x*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX);
1292 }
1293
1294 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
1295 {
1296     return (wxCoord) ((y - m_logicalOriginY)*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY + m_deviceOriginY);
1297 }
1298
1299 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
1300 {
1301     return (wxCoord) (y*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY);
1302 }
1303
1304 // ---------------------------------------------------------------------------
1305 // bit blit
1306 // ---------------------------------------------------------------------------
1307
1308 bool wxDC::DoBlit( wxCoord xdest
1309                   ,wxCoord ydest
1310                   ,wxCoord width
1311                   ,wxCoord height
1312                   ,wxDC *source
1313                   ,wxCoord xsrc
1314                   ,wxCoord ysrc
1315                   ,int  rop
1316                   ,bool useMask
1317                  )
1318 {
1319    // TODO
1320    return(TRUE);
1321 }
1322
1323 void wxDC::DoGetSize( int* width, int* height ) const
1324 {
1325     // TODO:
1326 };
1327
1328 void wxDC::DoGetSizeMM( int* width, int* height ) const
1329 {
1330     // TODO:
1331 };
1332
1333 wxSize wxDC::GetPPI() const
1334 {
1335    int x = 1;
1336    int y = 1;
1337    // TODO:
1338    return (wxSize(x,y));
1339 }
1340
1341 void wxDC::SetLogicalScale( double x, double y )
1342 {
1343     // TODO:
1344 };
1345
1346 #if WXWIN_COMPATIBILITY
1347 void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
1348                          float *descent, float *externalLeading,
1349                          wxFont *theFont, bool use16bit) const
1350 {
1351     wxCoord x1, y1, descent1, externalLeading1;
1352     GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
1353     *x = x1; *y = y1;
1354     if (descent)
1355         *descent = descent1;
1356     if (externalLeading)
1357         *externalLeading = externalLeading1;
1358 }
1359 #endif
1360
1361 // ---------------------------------------------------------------------------
1362 // spline drawing code
1363 // ---------------------------------------------------------------------------
1364
1365 #if wxUSE_SPLINES
1366
1367 class wxSpline: public wxObject
1368 {
1369 public:
1370     int type;
1371     wxList *points;
1372
1373     wxSpline(wxList *list);
1374     void DeletePoints();
1375
1376     // Doesn't delete points
1377     ~wxSpline();
1378 };
1379
1380 void wx_draw_open_spline(wxDC *dc, wxSpline *spline);
1381
1382 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
1383                          double a3, double b3, double a4, double b4);
1384 void wx_clear_stack();
1385 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
1386                   double *y3, double *x4, double *y4);
1387 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
1388                     double x4, double y4);
1389 static bool wx_spline_add_point(double x, double y);
1390 static void wx_spline_draw_point_array(wxDC *dc);
1391 wxSpline *wx_make_spline(int x1, int y1, int x2, int y2, int x3, int y3);
1392
1393 void wxDC::DoDrawSpline(wxList *list)
1394 {
1395     wxSpline spline(list);
1396
1397     wx_draw_open_spline(this, &spline);
1398 }
1399
1400 wxList wx_spline_point_list;
1401
1402 void wx_draw_open_spline(wxDC *dc, wxSpline *spline)
1403 {
1404     wxPoint *p;
1405     double           cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
1406     double           x1, y1, x2, y2;
1407
1408     wxNode *node = spline->points->First();
1409     p = (wxPoint *)node->Data();
1410
1411     x1 = p->x;
1412     y1 = p->y;
1413
1414     node = node->Next();
1415     p = (wxPoint *)node->Data();
1416
1417     x2 = p->x;
1418     y2 = p->y;
1419     cx1 = (double)((x1 + x2) / 2);
1420     cy1 = (double)((y1 + y2) / 2);
1421     cx2 = (double)((cx1 + x2) / 2);
1422     cy2 = (double)((cy1 + y2) / 2);
1423
1424     wx_spline_add_point(x1, y1);
1425
1426     while ((node = node->Next()) != NULL)
1427     {
1428         p = (wxPoint *)node->Data();
1429         x1 = x2;
1430         y1 = y2;
1431         x2 = p->x;
1432         y2 = p->y;
1433         cx4 = (double)(x1 + x2) / 2;
1434         cy4 = (double)(y1 + y2) / 2;
1435         cx3 = (double)(x1 + cx4) / 2;
1436         cy3 = (double)(y1 + cy4) / 2;
1437
1438         wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
1439
1440         cx1 = cx4;
1441         cy1 = cy4;
1442         cx2 = (double)(cx1 + x2) / 2;
1443         cy2 = (double)(cy1 + y2) / 2;
1444     }
1445
1446     wx_spline_add_point((double)wx_round(cx1), (double)wx_round(cy1));
1447     wx_spline_add_point(x2, y2);
1448
1449     wx_spline_draw_point_array(dc);
1450
1451 }
1452
1453 /********************* CURVES FOR SPLINES *****************************
1454
1455   The following spline drawing routine is from
1456
1457     "An Algorithm for High-Speed Curve Generation"
1458     by George Merrill Chaikin,
1459     Computer Graphics and Image Processing, 3, Academic Press,
1460     1974, 346-349.
1461
1462       and
1463
1464         "On Chaikin's Algorithm" by R. F. Riesenfeld,
1465         Computer Graphics and Image Processing, 4, Academic Press,
1466         1975, 304-310.
1467
1468 ***********************************************************************/
1469
1470 #define     half(z1, z2)    ((z1+z2)/2.0)
1471 #define     THRESHOLD   5
1472
1473 /* iterative version */
1474
1475 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
1476                          double b4)
1477 {
1478     register double  xmid, ymid;
1479     double           x1, y1, x2, y2, x3, y3, x4, y4;
1480
1481     wx_clear_stack();
1482     wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
1483
1484     while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
1485         xmid = (double)half(x2, x3);
1486         ymid = (double)half(y2, y3);
1487         if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
1488             fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
1489             wx_spline_add_point((double)wx_round(x1), (double)wx_round(y1));
1490             wx_spline_add_point((double)wx_round(xmid), (double)wx_round(ymid));
1491         } else {
1492             wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
1493                 (double)half(x3, x4), (double)half(y3, y4), x4, y4);
1494             wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
1495                 (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
1496         }
1497     }
1498 }
1499
1500
1501 /* utilities used by spline drawing routines */
1502
1503
1504 typedef struct wx_spline_stack_struct {
1505     double           x1, y1, x2, y2, x3, y3, x4, y4;
1506 }
1507 Stack;
1508
1509 #define         SPLINE_STACK_DEPTH             20
1510 static Stack    wx_spline_stack[SPLINE_STACK_DEPTH];
1511 static Stack   *wx_stack_top;
1512 static int      wx_stack_count;
1513
1514 void wx_clear_stack()
1515 {
1516     wx_stack_top = wx_spline_stack;
1517     wx_stack_count = 0;
1518 }
1519
1520 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
1521 {
1522     wx_stack_top->x1 = x1;
1523     wx_stack_top->y1 = y1;
1524     wx_stack_top->x2 = x2;
1525     wx_stack_top->y2 = y2;
1526     wx_stack_top->x3 = x3;
1527     wx_stack_top->y3 = y3;
1528     wx_stack_top->x4 = x4;
1529     wx_stack_top->y4 = y4;
1530     wx_stack_top++;
1531     wx_stack_count++;
1532 }
1533
1534 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
1535                   double *x3, double *y3, double *x4, double *y4)
1536 {
1537     if (wx_stack_count == 0)
1538         return (0);
1539     wx_stack_top--;
1540     wx_stack_count--;
1541     *x1 = wx_stack_top->x1;
1542     *y1 = wx_stack_top->y1;
1543     *x2 = wx_stack_top->x2;
1544     *y2 = wx_stack_top->y2;
1545     *x3 = wx_stack_top->x3;
1546     *y3 = wx_stack_top->y3;
1547     *x4 = wx_stack_top->x4;
1548     *y4 = wx_stack_top->y4;
1549     return (1);
1550 }
1551
1552 static bool wx_spline_add_point(double x, double y)
1553 {
1554     wxPoint *point = new wxPoint;
1555     point->x = (int) x;
1556     point->y = (int) y;
1557     wx_spline_point_list.Append((wxObject*)point);
1558     return TRUE;
1559 }
1560
1561 static void wx_spline_draw_point_array(wxDC *dc)
1562 {
1563     dc->DrawLines(&wx_spline_point_list, 0, 0);
1564     wxNode *node = wx_spline_point_list.First();
1565     while (node)
1566     {
1567         wxPoint *point = (wxPoint *)node->Data();
1568         delete point;
1569         delete node;
1570         node = wx_spline_point_list.First();
1571     }
1572 }
1573
1574 wxSpline::wxSpline(wxList *list)
1575 {
1576     points = list;
1577 }
1578
1579 wxSpline::~wxSpline()
1580 {
1581 }
1582
1583 void wxSpline::DeletePoints()
1584 {
1585     for(wxNode *node = points->First(); node; node = points->First())
1586     {
1587         wxPoint *point = (wxPoint *)node->Data();
1588         delete point;
1589         delete node;
1590     }
1591     delete points;
1592 }
1593
1594
1595 #endif // wxUSE_SPLINES
1596