src/common/dcgraph.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/graphcmn.cpp
   3 // Purpose:     graphics context methods common to all platforms
   4 // Author:      Stefan Csomor
   5 // Modified by:
   6 // Created:
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Stefan Csomor
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #if defined(__BORLANDC__)
  16     #pragma hdrstop
  17 #endif
  18
  19 #if wxUSE_GRAPHICS_CONTEXT
  20
  21 #include "wx/graphics.h"
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/icon.h"
  25     #include "wx/bitmap.h"
  26     #include "wx/dcmemory.h"
  27     #include "wx/region.h"
  28 #endif
  29
  30 //-----------------------------------------------------------------------------
  31 // constants
  32 //-----------------------------------------------------------------------------
  33
  34 static const double RAD2DEG = 180.0 / M_PI;
  35
  36 //-----------------------------------------------------------------------------
  37 // Local functions
  38 //-----------------------------------------------------------------------------
  39
  40 static inline double DegToRad(double deg)
  41 {
  42     return (deg * M_PI) / 180.0;
  43 }
  44
  45 //-----------------------------------------------------------------------------
  46 // wxDC bridge class
  47 //-----------------------------------------------------------------------------
  48
  49 #ifdef __WXMAC__
  50 IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDCBase)
  51 #else
  52 IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDC)
  53 #endif
  54
  55 wxGCDC::wxGCDC()
  56 {
  57     Init();
  58 }
  59
  60 void wxGCDC::SetGraphicsContext( wxGraphicsContext* ctx )
  61 {
  62     delete m_graphicContext;
  63     m_graphicContext = ctx;
  64 }
  65
  66 wxGCDC::wxGCDC(const wxWindowDC& dc)
  67 {
  68     Init();
  69     m_graphicContext = wxGraphicsContext::Create(dc);
  70     m_ok = true;
  71     if ( dc.GetFont().Ok())
  72         m_graphicContext->SetFont( m_graphicContext->CreateFont(dc.GetFont(),dc.GetTextForeground()));
  73     if ( dc.GetPen().Ok())
  74         m_graphicContext->SetPen( m_graphicContext->CreatePen(dc.GetPen()));
  75     if ( dc.GetBrush().Ok())
  76         m_graphicContext->SetBrush( m_graphicContext->CreateBrush(dc.GetBrush()));
  77 }
  78
  79 void wxGCDC::Init()
  80 {
  81     m_ok = false;
  82     m_colour = true;
  83     m_mm_to_pix_x = mm2pt;
  84     m_mm_to_pix_y = mm2pt;
  85
  86     m_pen = *wxBLACK_PEN;
  87     m_font = *wxNORMAL_FONT;
  88     m_brush = *wxWHITE_BRUSH;
  89
  90     m_graphicContext = NULL;
  91 }
  92
  93
  94 wxGCDC::~wxGCDC()
  95 {
  96     delete m_graphicContext;
  97 }
  98
  99 void wxGCDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool WXUNUSED(useMask) )
 100 {
 101     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
 102     wxCHECK_RET( bmp.Ok(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
 103
 104     wxCoord xx = LogicalToDeviceX(x);
 105     wxCoord yy = LogicalToDeviceY(y);
 106     wxCoord w = bmp.GetWidth();
 107     wxCoord h = bmp.GetHeight();
 108     wxCoord ww = LogicalToDeviceXRel(w);
 109     wxCoord hh = LogicalToDeviceYRel(h);
 110
 111     m_graphicContext->DrawBitmap( bmp, xx , yy , ww , hh );
 112 }
 113
 114 void wxGCDC::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
 115 {
 116     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
 117     wxCHECK_RET( icon.Ok(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
 118
 119     wxCoord xx = LogicalToDeviceX(x);
 120     wxCoord yy = LogicalToDeviceY(y);
 121     wxCoord w = icon.GetWidth();
 122     wxCoord h = icon.GetHeight();
 123     wxCoord ww = LogicalToDeviceXRel(w);
 124     wxCoord hh = LogicalToDeviceYRel(h);
 125
 126     m_graphicContext->DrawIcon( icon , xx, yy, ww, hh );
 127 }
 128
 129 void wxGCDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
 130 {
 131     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
 132
 133     wxCoord xx, yy, ww, hh;
 134     xx = LogicalToDeviceX(x);
 135     yy = LogicalToDeviceY(y);
 136     ww = LogicalToDeviceXRel(width);
 137     hh = LogicalToDeviceYRel(height);
 138
 139     m_graphicContext->Clip( xx, yy, ww, hh );
 140     if ( m_clipping )
 141     {
 142         m_clipX1 = wxMax( m_clipX1, xx );
 143         m_clipY1 = wxMax( m_clipY1, yy );
 144         m_clipX2 = wxMin( m_clipX2, (xx + ww) );
 145         m_clipY2 = wxMin( m_clipY2, (yy + hh) );
 146     }
 147     else
 148     {
 149         m_clipping = true;
 150
 151         m_clipX1 = xx;
 152         m_clipY1 = yy;
 153         m_clipX2 = xx + ww;
 154         m_clipY2 = yy + hh;
 155     }
 156 }
 157
 158 void wxGCDC::DoSetClippingRegionAsRegion( const wxRegion &region )
 159 {
 160     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoSetClippingRegionAsRegion - invalid DC") );
 161
 162     if (region.Empty())
 163     {
 164         DestroyClippingRegion();
 165         return;
 166     }
 167
 168     wxCoord x, y, w, h;
 169     region.GetBox( x, y, w, h );
 170     wxCoord xx, yy, ww, hh;
 171     xx = LogicalToDeviceX(x);
 172     yy = LogicalToDeviceY(y);
 173     ww = LogicalToDeviceXRel(w);
 174     hh = LogicalToDeviceYRel(h);
 175
 176     // if we have a scaling that we cannot map onto native regions
 177     // we must use the box
 178     if ( ww != w || hh != h )
 179     {
 180         wxGCDC::DoSetClippingRegion( x, y, w, h );
 181     }
 182     else
 183     {
 184         m_graphicContext->Clip( region );
 185         if ( m_clipping )
 186         {
 187             m_clipX1 = wxMax( m_clipX1, xx );
 188             m_clipY1 = wxMax( m_clipY1, yy );
 189             m_clipX2 = wxMin( m_clipX2, (xx + ww) );
 190             m_clipY2 = wxMin( m_clipY2, (yy + hh) );
 191         }
 192         else
 193         {
 194             m_clipping = true;
 195
 196             m_clipX1 = xx;
 197             m_clipY1 = yy;
 198             m_clipX2 = xx + ww;
 199             m_clipY2 = yy + hh;
 200         }
 201     }
 202 }
 203
 204 void wxGCDC::DestroyClippingRegion()
 205 {
 206     m_graphicContext->ResetClip();
 207     m_graphicContext->SetPen( m_pen );
 208     m_graphicContext->SetBrush( m_brush );
 209
 210     m_clipping = false;
 211 }
 212
 213 void wxGCDC::DoGetSizeMM( int* width, int* height ) const
 214 {
 215     int w = 0, h = 0;
 216
 217     GetSize( &w, &h );
 218     if (width)
 219         *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
 220     if (height)
 221         *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
 222 }
 223
 224 void wxGCDC::SetTextForeground( const wxColour &col )
 225 {
 226     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 227
 228     if ( col != m_textForegroundColour )
 229     {
 230         m_textForegroundColour = col;
 231         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 232     }
 233 }
 234
 235 void wxGCDC::SetTextBackground( const wxColour &col )
 236 {
 237     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 238
 239     m_textBackgroundColour = col;
 240 }
 241
 242 void wxGCDC::SetMapMode( int mode )
 243 {
 244     switch (mode)
 245     {
 246     case wxMM_TWIPS:
 247         SetLogicalScale( twips2mm * m_mm_to_pix_x, twips2mm * m_mm_to_pix_y );
 248         break;
 249
 250     case wxMM_POINTS:
 251         SetLogicalScale( pt2mm * m_mm_to_pix_x, pt2mm * m_mm_to_pix_y );
 252         break;
 253
 254     case wxMM_METRIC:
 255         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 256         break;
 257
 258     case wxMM_LOMETRIC:
 259         SetLogicalScale( m_mm_to_pix_x / 10.0, m_mm_to_pix_y / 10.0 );
 260         break;
 261
 262     case wxMM_TEXT:
 263     default:
 264         SetLogicalScale( 1.0, 1.0 );
 265         break;
 266     }
 267
 268     ComputeScaleAndOrigin();
 269 }
 270
 271 void wxGCDC::SetUserScale( double x, double y )
 272 {
 273     // allow negative ? -> no
 274
 275     m_userScaleX = x;
 276     m_userScaleY = y;
 277     ComputeScaleAndOrigin();
 278 }
 279
 280 void wxGCDC::SetLogicalScale( double x, double y )
 281 {
 282     // allow negative ?
 283     m_logicalScaleX = x;
 284     m_logicalScaleY = y;
 285     ComputeScaleAndOrigin();
 286 }
 287
 288 void wxGCDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 289 {
 290     m_logicalOriginX = x * m_signX;   // is this still correct ?
 291     m_logicalOriginY = y * m_signY;
 292     ComputeScaleAndOrigin();
 293 }
 294
 295 void wxGCDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 296 {
 297     m_deviceOriginX = x;
 298     m_deviceOriginY = y;
 299     ComputeScaleAndOrigin();
 300 }
 301
 302 void wxGCDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 303 {
 304     m_signX = (xLeftRight ?  1 : -1);
 305     m_signY = (yBottomUp ? -1 :  1);
 306     ComputeScaleAndOrigin();
 307 }
 308
 309 wxSize wxGCDC::GetPPI() const
 310 {
 311     return wxSize(72, 72);
 312 }
 313
 314 int wxGCDC::GetDepth() const
 315 {
 316     return 32;
 317 }
 318
 319 void wxGCDC::ComputeScaleAndOrigin()
 320 {
 321     // CMB: copy scale to see if it changes
 322     double origScaleX = m_scaleX;
 323     double origScaleY = m_scaleY;
 324     m_scaleX = m_logicalScaleX * m_userScaleX;
 325     m_scaleY = m_logicalScaleY * m_userScaleY;
 326     m_deviceOriginX = m_deviceOriginX + m_logicalOriginX;
 327     m_deviceOriginY = m_deviceOriginY + m_logicalOriginY;
 328
 329     // CMB: if scale has changed call SetPen to recalulate the line width
 330     if (m_scaleX != origScaleX || m_scaleY != origScaleY)
 331     {
 332         // this is a bit artificial, but we need to force wxDC to think
 333         // the pen has changed
 334         wxPen pen(GetPen());
 335         m_pen = wxNullPen;
 336         SetPen(pen);
 337         SetFont(m_font);
 338     }
 339 }
 340
 341 void wxGCDC::SetPalette( const wxPalette& WXUNUSED(palette) )
 342 {
 343
 344 }
 345
 346 void wxGCDC::SetBackgroundMode( int mode )
 347 {
 348     m_backgroundMode = mode;
 349 }
 350
 351 void wxGCDC::SetFont( const wxFont &font )
 352 {
 353     m_font = font;
 354     if ( m_graphicContext )
 355     {
 356         wxFont f = font;
 357         if ( f.Ok() )
 358             f.SetPointSize( LogicalToDeviceYRel(font.GetPointSize()));
 359         m_graphicContext->SetFont( f, m_textForegroundColour );
 360     }
 361 }
 362
 363 void wxGCDC::SetPen( const wxPen &pen )
 364 {
 365     if ( m_pen == pen )
 366         return;
 367
 368     m_pen = pen;
 369     if ( m_graphicContext )
 370     {
 371         if ( m_pen.GetStyle() == wxSOLID || m_pen.GetStyle() == wxTRANSPARENT )
 372         {
 373             m_graphicContext->SetPen( m_pen );
 374         }
 375         else
 376         {
 377             // we have to compensate for moved device origins etc. otherwise patterned pens are standing still
 378             // eg when using a wxScrollWindow and scrolling around
 379             int origX = LogicalToDeviceX( 0 );
 380             int origY = LogicalToDeviceY( 0 );
 381             m_graphicContext->Translate( origX , origY );
 382             m_graphicContext->SetPen( m_pen );
 383             m_graphicContext->Translate( -origX , -origY );
 384         }
 385     }
 386 }
 387
 388 void wxGCDC::SetBrush( const wxBrush &brush )
 389 {
 390     if (m_brush == brush)
 391         return;
 392
 393     m_brush = brush;
 394     if ( m_graphicContext )
 395     {
 396         if ( brush.GetStyle() == wxSOLID || brush.GetStyle() == wxTRANSPARENT )
 397         {
 398             m_graphicContext->SetBrush( m_brush );
 399         }
 400         else
 401         {
 402             // we have to compensate for moved device origins etc. otherwise patterned brushes are standing still
 403             // eg when using a wxScrollWindow and scrolling around
 404             // TODO on MSW / GDIPlus this still occurs with hatched brushes
 405             int origX = LogicalToDeviceX(0);
 406             int origY = LogicalToDeviceY(0);
 407             m_graphicContext->Translate( origX , origY );
 408             m_graphicContext->SetBrush( m_brush );
 409             m_graphicContext->Translate( -origX , -origY );
 410         }
 411     }
 412 }
 413
 414 void wxGCDC::SetBackground( const wxBrush &brush )
 415 {
 416     if (m_backgroundBrush == brush)
 417         return;
 418
 419     m_backgroundBrush = brush;
 420     if (!m_backgroundBrush.Ok())
 421         return;
 422 }
 423
 424 void wxGCDC::SetLogicalFunction( int function )
 425 {
 426     if (m_logicalFunction == function)
 427         return;
 428
 429     m_logicalFunction = function;
 430 #if wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
 431
 432     CGContextRef cgContext = ((wxCairoContext*)(m_graphicContext))->GetNativeContext();
 433     if ( m_logicalFunction == wxCOPY )
 434         CGContextSetBlendMode( cgContext, kCGBlendModeNormal );
 435     else if ( m_logicalFunction == wxINVERT )
 436         CGContextSetBlendMode( cgContext, kCGBlendModeExclusion );
 437     else
 438         CGContextSetBlendMode( cgContext, kCGBlendModeNormal );
 439 #endif
 440
 441 }
 442
 443 bool wxGCDC::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 444                          const wxColour& WXUNUSED(col), int WXUNUSED(style))
 445 {
 446     return false;
 447 }
 448
 449 bool wxGCDC::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 450 {
 451     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 452     return false;
 453 }
 454
 455 void wxGCDC::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 456 {
 457     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 458
 459 #if !wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
 460
 461     if ( m_logicalFunction != wxCOPY )
 462         return;
 463 #endif
 464
 465     wxCoord xx1 = LogicalToDeviceX(x1);
 466     wxCoord yy1 = LogicalToDeviceY(y1);
 467     wxCoord xx2 = LogicalToDeviceX(x2);
 468     wxCoord yy2 = LogicalToDeviceY(y2);
 469
 470     m_graphicContext->StrokeLine(xx1,yy1,xx2,yy2);
 471
 472     CalcBoundingBox(x1, y1);
 473     CalcBoundingBox(x2, y2);
 474 }
 475
 476 void wxGCDC::DoCrossHair( wxCoord x, wxCoord y )
 477 {
 478     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 479
 480     if ( m_logicalFunction != wxCOPY )
 481         return;
 482
 483     int w = 0, h = 0;
 484
 485     GetSize( &w, &h );
 486
 487     wxCoord xx = LogicalToDeviceX(x);
 488     wxCoord yy = LogicalToDeviceY(y);
 489     wxCoord xw = LogicalToDeviceX(w);
 490     wxCoord x0 = LogicalToDeviceX(0);
 491     wxCoord y0 = LogicalToDeviceY(0);
 492     wxCoord yh = LogicalToDeviceY(h);
 493
 494     m_graphicContext->StrokeLine(x0,yy,xw,yy);
 495     m_graphicContext->StrokeLine(xx,y0,xx,yh);
 496
 497     CalcBoundingBox(x0, y0);
 498     CalcBoundingBox(x0+xw, y0+yh);
 499 }
 500
 501 void wxGCDC::DoDrawArc( wxCoord x1, wxCoord y1,
 502                         wxCoord x2, wxCoord y2,
 503                         wxCoord xc, wxCoord yc )
 504 {
 505     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 506
 507     if ( m_logicalFunction != wxCOPY )
 508         return;
 509
 510     wxCoord xx1 = LogicalToDeviceX(x1);
 511     wxCoord yy1 = LogicalToDeviceY(y1);
 512     wxCoord xx2 = LogicalToDeviceX(x2);
 513     wxCoord yy2 = LogicalToDeviceY(y2);
 514     wxCoord xxc = LogicalToDeviceX(xc);
 515     wxCoord yyc = LogicalToDeviceY(yc);
 516
 517     double dx = xx1 - xxc;
 518     double dy = yy1 - yyc;
 519     double radius = sqrt((double)(dx * dx + dy * dy));
 520     wxCoord rad = (wxCoord)radius;
 521     double sa, ea;
 522     if (xx1 == xx2 && yy1 == yy2)
 523     {
 524         sa = 0.0;
 525         ea = 360.0;
 526     }
 527     else if (radius == 0.0)
 528     {
 529         sa = ea = 0.0;
 530     }
 531     else
 532     {
 533         sa = (xx1 - xxc == 0) ?
 534      (yy1 - yyc < 0) ? 90.0 : -90.0 :
 535              -atan2(double(yy1 - yyc), double(xx1 - xxc)) * RAD2DEG;
 536         ea = (xx2 - xxc == 0) ?
 537      (yy2 - yyc < 0) ? 90.0 : -90.0 :
 538              -atan2(double(yy2 - yyc), double(xx2 - xxc)) * RAD2DEG;
 539     }
 540
 541     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 542
 543     wxGraphicsPath path = m_graphicContext->CreatePath();
 544     if ( fill && ((x1!=x2)||(y1!=y2)) )
 545         path.MoveToPoint( xxc, yyc );
 546     path.AddArc( xxc, yyc , rad , DegToRad(sa) , DegToRad(ea), false );
 547     if ( fill && ((x1!=x2)||(y1!=y2)) )
 548         path.AddLineToPoint( xxc, yyc );
 549     m_graphicContext->DrawPath(path);
 550 }
 551
 552 void wxGCDC::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 553                                 double sa, double ea )
 554 {
 555     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 556
 557     if ( m_logicalFunction != wxCOPY )
 558         return;
 559
 560     wxCoord xx = LogicalToDeviceX(x);
 561     wxCoord yy = LogicalToDeviceY(y);
 562     wxCoord ww = m_signX * LogicalToDeviceXRel(w);
 563     wxCoord hh = m_signY * LogicalToDeviceYRel(h);
 564
 565     // handle -ve width and/or height
 566     if (ww < 0)
 567     {
 568         ww = -ww;
 569         xx = xx - ww;
 570     }
 571     if (hh < 0)
 572     {
 573         hh = -hh;
 574         yy = yy - hh;
 575     }
 576
 577     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 578
 579     wxGraphicsPath path = m_graphicContext->CreatePath();
 580     m_graphicContext->PushState();
 581     m_graphicContext->Translate(xx+ww/2,yy+hh/2);
 582     wxDouble factor = ((wxDouble) ww) / hh;
 583     m_graphicContext->Scale( factor , 1.0);
 584     if ( fill && (sa!=ea) )
 585         path.MoveToPoint(0,0);
 586     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 587     // get clockwise angles
 588     path.AddArc( 0, 0, hh/2 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 589     if ( fill && (sa!=ea) )
 590         path.AddLineToPoint(0,0);
 591     m_graphicContext->DrawPath( path );
 592     m_graphicContext->PopState();
 593 }
 594
 595 void wxGCDC::DoDrawPoint( wxCoord x, wxCoord y )
 596 {
 597     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 598
 599     DoDrawLine( x , y , x + 1 , y + 1 );
 600 }
 601
 602 void wxGCDC::DoDrawLines(int n, wxPoint points[],
 603                          wxCoord xoffset, wxCoord yoffset)
 604 {
 605     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 606
 607 #if !wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
 608
 609     if ( m_logicalFunction != wxCOPY )
 610         return;
 611 #endif
 612
 613     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 614     for( int i = 0; i < n; ++i)
 615     {
 616         pointsD[i].m_x = LogicalToDeviceX(points[i].x + xoffset);
 617         pointsD[i].m_y = LogicalToDeviceY(points[i].y + yoffset);
 618     }
 619
 620     m_graphicContext->StrokeLines( n , pointsD);
 621     delete[] pointsD;
 622 }
 623
 624 #if wxUSE_SPLINES
 625 void wxGCDC::DoDrawSpline(wxList *points)
 626 {
 627     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 628
 629     if ( m_logicalFunction != wxCOPY )
 630         return;
 631
 632     wxGraphicsPath path = m_graphicContext->CreatePath();
 633
 634     wxList::compatibility_iterator node = points->GetFirst();
 635     if (node == wxList::compatibility_iterator())
 636         // empty list
 637         return;
 638
 639     wxPoint *p = (wxPoint *)node->GetData();
 640
 641     wxCoord x1 = p->x;
 642     wxCoord y1 = p->y;
 643
 644     node = node->GetNext();
 645     p = (wxPoint *)node->GetData();
 646
 647     wxCoord x2 = p->x;
 648     wxCoord y2 = p->y;
 649     wxCoord cx1 = ( x1 + x2 ) / 2;
 650     wxCoord cy1 = ( y1 + y2 ) / 2;
 651
 652     path.MoveToPoint( LogicalToDeviceX( x1 ) , LogicalToDeviceY( y1 ) );
 653     path.AddLineToPoint( LogicalToDeviceX( cx1 ) , LogicalToDeviceY( cy1 ) );
 654 #if !wxUSE_STL
 655
 656     while ((node = node->GetNext()) != NULL)
 657 #else
 658
 659     while ((node = node->GetNext()))
 660 #endif // !wxUSE_STL
 661
 662     {
 663         p = (wxPoint *)node->GetData();
 664         x1 = x2;
 665         y1 = y2;
 666         x2 = p->x;
 667         y2 = p->y;
 668         wxCoord cx4 = (x1 + x2) / 2;
 669         wxCoord cy4 = (y1 + y2) / 2;
 670
 671         path.AddQuadCurveToPoint(
 672             LogicalToDeviceX( x1 ) , LogicalToDeviceY( y1 ) ,
 673             LogicalToDeviceX( cx4 ) , LogicalToDeviceY( cy4 ) );
 674
 675         cx1 = cx4;
 676         cy1 = cy4;
 677     }
 678
 679     path.AddLineToPoint( LogicalToDeviceX( x2 ) , LogicalToDeviceY( y2 ) );
 680
 681     m_graphicContext->StrokePath( path );
 682 }
 683 #endif // wxUSE_SPLINES
 684
 685 void wxGCDC::DoDrawPolygon( int n, wxPoint points[],
 686                             wxCoord xoffset, wxCoord yoffset,
 687                             int fillStyle )
 688 {
 689     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 690
 691     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 692         return;
 693     if ( m_logicalFunction != wxCOPY )
 694         return;
 695
 696     bool closeIt = false;
 697     if (points[n-1] != points[0])
 698         closeIt = true;
 699
 700     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 701     for( int i = 0; i < n; ++i)
 702     {
 703         pointsD[i].m_x = LogicalToDeviceX(points[i].x + xoffset);
 704         pointsD[i].m_y = LogicalToDeviceY(points[i].y + yoffset);
 705     }
 706     if ( closeIt )
 707         pointsD[n] = pointsD[0];
 708
 709     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 710     delete[] pointsD;
 711 }
 712
 713 void wxGCDC::DoDrawPolyPolygon(int n,
 714                                int count[],
 715                                wxPoint points[],
 716                                wxCoord xoffset,
 717                                wxCoord yoffset,
 718                                int fillStyle)
 719 {
 720     wxASSERT(n > 1);
 721     wxGraphicsPath path = m_graphicContext->CreatePath();
 722
 723     int i = 0;
 724     for ( int j = 0; j < n; ++j)
 725     {
 726         wxPoint start = points[i];
 727         path.MoveToPoint(LogicalToDeviceX(start.x+ xoffset), LogicalToDeviceY(start.y+ yoffset));
 728         ++i;
 729         int l = count[j];
 730         for ( int k = 1; k < l; ++k)
 731         {
 732             path.AddLineToPoint( LogicalToDeviceX(points[i].x+ xoffset), LogicalToDeviceY(points[i].y+ yoffset));
 733             ++i;
 734         }
 735         // close the polygon
 736         if ( start != points[i-1])
 737             path.AddLineToPoint( LogicalToDeviceX(start.x+ xoffset), LogicalToDeviceY(start.y+ yoffset));
 738     }
 739     m_graphicContext->DrawPath( path , fillStyle);
 740 }
 741
 742 void wxGCDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 743 {
 744     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 745
 746     if ( m_logicalFunction != wxCOPY )
 747         return;
 748
 749     wxCoord xx = LogicalToDeviceX(x);
 750     wxCoord yy = LogicalToDeviceY(y);
 751     wxCoord ww = m_signX * LogicalToDeviceXRel(width);
 752     wxCoord hh = m_signY * LogicalToDeviceYRel(height);
 753
 754     // CMB: draw nothing if transformed w or h is 0
 755     if (ww == 0 || hh == 0)
 756         return;
 757
 758     // CMB: handle -ve width and/or height
 759     if (ww < 0)
 760     {
 761         ww = -ww;
 762         xx = xx - ww;
 763     }
 764     if (hh < 0)
 765     {
 766         hh = -hh;
 767         yy = yy - hh;
 768     }
 769     if ( m_graphicContext->ShouldOffset() )
 770     {
 771         // if we are offsetting the entire rectangle is moved 0.5, so the
 772         // border line gets off by 1
 773         ww -= 1;
 774         hh -= 1;
 775     }
 776     m_graphicContext->DrawRectangle( xx,yy,ww,hh);
 777 }
 778
 779 void wxGCDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 780                                     wxCoord width, wxCoord height,
 781                                     double radius)
 782 {
 783     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 784
 785     if ( m_logicalFunction != wxCOPY )
 786         return;
 787
 788     if (radius < 0.0)
 789         radius = - radius * ((width < height) ? width : height);
 790     wxCoord xx = LogicalToDeviceX(x);
 791     wxCoord yy = LogicalToDeviceY(y);
 792     wxCoord ww = m_signX * LogicalToDeviceXRel(width);
 793     wxCoord hh = m_signY * LogicalToDeviceYRel(height);
 794
 795     // CMB: draw nothing if transformed w or h is 0
 796     if (ww == 0 || hh == 0)
 797         return;
 798
 799     // CMB: handle -ve width and/or height
 800     if (ww < 0)
 801     {
 802         ww = -ww;
 803         xx = xx - ww;
 804     }
 805     if (hh < 0)
 806     {
 807         hh = -hh;
 808         yy = yy - hh;
 809     }
 810
 811     m_graphicContext->DrawRoundedRectangle( xx,yy,ww,hh,radius);
 812 }
 813
 814 void wxGCDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 815 {
 816     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 817
 818     if ( m_logicalFunction != wxCOPY )
 819         return;
 820
 821     wxDouble xx = LogicalToDeviceX(x);
 822     wxDouble yy = LogicalToDeviceY(y);
 823     wxDouble ww = m_signX * LogicalToDeviceXRel(width);
 824     wxDouble hh = m_signY * LogicalToDeviceYRel(height);
 825
 826     // CMB: draw nothing if transformed w or h is 0
 827     if (ww == 0 || hh == 0)
 828         return;
 829
 830     // CMB: handle -ve width and/or height
 831     if (ww < 0)
 832     {
 833         ww = -ww;
 834         xx = xx - ww;
 835     }
 836     if (hh < 0)
 837     {
 838         hh = -hh;
 839         yy = yy - hh;
 840     }
 841
 842     m_graphicContext->DrawEllipse(xx,yy,ww,hh);
 843 }
 844
 845 bool wxGCDC::CanDrawBitmap() const
 846 {
 847     return true;
 848 }
 849
 850 bool wxGCDC::DoBlit(
 851     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 852     wxDC *source, wxCoord xsrc, wxCoord ysrc, int logical_func , bool WXUNUSED(useMask),
 853     wxCoord xsrcMask, wxCoord ysrcMask )
 854 {
 855     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::DoBlit - invalid DC") );
 856     wxCHECK_MSG( source->Ok(), false, wxT("wxGCDC(cg)::DoBlit - invalid source DC") );
 857
 858     if ( logical_func == wxNO_OP )
 859         return true;
 860
 861     if (xsrcMask == -1 && ysrcMask == -1)
 862     {
 863         xsrcMask = xsrc;
 864         ysrcMask = ysrc;
 865     }
 866
 867     wxCoord yysrc = source-> LogicalToDeviceY(ysrc);
 868     wxCoord xxsrc = source-> LogicalToDeviceX(xsrc);
 869     wxCoord wwsrc = source-> LogicalToDeviceXRel(width);
 870     wxCoord hhsrc = source-> LogicalToDeviceYRel(height);
 871
 872     wxCoord yydest = LogicalToDeviceY(ydest);
 873     wxCoord xxdest = LogicalToDeviceX(xdest);
 874     wxCoord wwdest = LogicalToDeviceXRel(width);
 875     wxCoord hhdest = LogicalToDeviceYRel(height);
 876
 877     wxMemoryDC* memdc = wxDynamicCast(source,wxMemoryDC);
 878     if ( memdc && logical_func == wxCOPY )
 879     {
 880         wxBitmap blit = memdc->GetSelectedBitmap();
 881
 882         wxASSERT_MSG( blit.Ok() , wxT("Invalid bitmap for blitting") );
 883
 884         wxCoord bmpwidth = blit.GetWidth();
 885         wxCoord bmpheight = blit.GetHeight();
 886
 887         if ( xxsrc != 0 || yysrc != 0 || bmpwidth != wwsrc || bmpheight != hhsrc )
 888         {
 889             wwsrc = wxMin( wwsrc , bmpwidth - xxsrc );
 890             hhsrc = wxMin( hhsrc , bmpheight - yysrc );
 891             if ( wwsrc > 0 && hhsrc > 0 )
 892             {
 893                 if ( xxsrc >= 0 && yysrc >= 0 )
 894                 {
 895                     wxRect subrect( xxsrc, yysrc, wwsrc , hhsrc );
 896                     // TODO we perhaps could add a DrawSubBitmap call to dc for performance reasons
 897                     blit = blit.GetSubBitmap( subrect );
 898                 }
 899                 else
 900                 {
 901                     // in this case we'd probably have to adjust the different coordinates, but
 902                     // we have to find out proper contract first
 903                     blit = wxNullBitmap;
 904                 }
 905             }
 906             else
 907             {
 908                 blit = wxNullBitmap;
 909             }
 910         }
 911
 912         if ( blit.Ok() )
 913         {
 914             m_graphicContext->DrawBitmap( blit, xxdest , yydest , wwdest , hhdest );
 915         }
 916     }
 917     else
 918     {
 919         wxFAIL_MSG( wxT("Blitting is only supported from bitmap contexts, and only with wxCOPY logical operation.") );
 920         return false;
 921     }
 922
 923     return true;
 924 }
 925
 926 void wxGCDC::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 927                                double angle)
 928 {
 929     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 930
 931     if ( str.length() == 0 )
 932         return;
 933     if ( m_logicalFunction != wxCOPY )
 934         return;
 935
 936     int drawX = LogicalToDeviceX(x);
 937     int drawY = LogicalToDeviceY(y);
 938
 939     m_graphicContext->DrawText( str, drawX ,drawY , DegToRad(angle ));
 940 }
 941
 942 void wxGCDC::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 943 {
 944     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 945
 946     if ( str.length() == 0 )
 947         return;
 948     if ( m_logicalFunction != wxCOPY )
 949         return;
 950
 951     int drawX = LogicalToDeviceX(x);
 952     int drawY = LogicalToDeviceY(y);
 953
 954     m_graphicContext->DrawText( str, drawX ,drawY);
 955 }
 956
 957 bool wxGCDC::CanGetTextExtent() const
 958 {
 959     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 960
 961     return true;
 962 }
 963
 964 void wxGCDC::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
 965                               wxCoord *descent, wxCoord *externalLeading ,
 966                               wxFont *theFont ) const
 967 {
 968     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 969
 970     if ( theFont )
 971     {
 972         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
 973     }
 974
 975     wxDouble h , d , e , w;
 976
 977     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
 978
 979     if ( height )
 980         *height = DeviceToLogicalYRel((wxCoord)h);
 981     if ( descent )
 982         *descent = DeviceToLogicalYRel((wxCoord)d);
 983     if ( externalLeading )
 984         *externalLeading = DeviceToLogicalYRel((wxCoord)e);
 985     if ( width )
 986         *width = DeviceToLogicalXRel((wxCoord)w);
 987
 988     if ( theFont )
 989     {
 990         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 991     }
 992 }
 993
 994 bool wxGCDC::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 995 {
 996     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
 997     widths.Clear();
 998     widths.Add(0,text.Length());
 999     if ( text.IsEmpty() )
1000         return true;
1001
1002     wxArrayDouble widthsD;
1003
1004     m_graphicContext->GetPartialTextExtents( text, widthsD );
1005     for ( size_t i = 0; i < widths.GetCount(); ++i )
1006         widths[i] = DeviceToLogicalXRel((wxCoord)(widthsD[i] + 0.5));
1007
1008     return true;
1009 }
1010
1011 wxCoord wxGCDC::GetCharWidth(void) const
1012 {
1013     wxCoord width;
1014     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
1015
1016     return width;
1017 }
1018
1019 wxCoord wxGCDC::GetCharHeight(void) const
1020 {
1021     wxCoord height;
1022     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
1023
1024     return height;
1025 }
1026
1027 void wxGCDC::Clear(void)
1028 {
1029     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::Clear - invalid DC") );
1030     // TODO better implementation / incorporate size info into wxGCDC or context
1031     m_graphicContext->SetBrush( m_backgroundBrush );
1032     wxPen p = *wxTRANSPARENT_PEN;
1033     m_graphicContext->SetPen( p );
1034     DoDrawRectangle( 0, 0, 32000 , 32000 );
1035     m_graphicContext->SetPen( m_pen );
1036     m_graphicContext->SetBrush( m_brush );
1037 }
1038
1039 void wxGCDC::DoGetSize(int *width, int *height) const
1040 {
1041     *width = 1000;
1042     *height = 1000;
1043 }
1044
1045 void wxGCDC::DoGradientFillLinear(const wxRect& rect,
1046                                   const wxColour& initialColour,
1047                                   const wxColour& destColour,
1048                                   wxDirection nDirection )
1049 {
1050     wxPoint start;
1051     wxPoint end;
1052     switch( nDirection)
1053     {
1054     case wxWEST :
1055         start = rect.GetRightBottom();
1056         start.x++;
1057         end = rect.GetLeftBottom();
1058         break;
1059     case wxEAST :
1060         start = rect.GetLeftBottom();
1061         end = rect.GetRightBottom();
1062         end.x++;
1063         break;
1064     case wxNORTH :
1065         start = rect.GetLeftBottom();
1066         start.y++;
1067         end = rect.GetLeftTop();
1068         break;
1069     case wxSOUTH :
1070         start = rect.GetLeftTop();
1071         end = rect.GetLeftBottom();
1072         end.y++;
1073         break;
1074     default :
1075         break;
1076     }
1077
1078     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
1079         LogicalToDeviceX(start.x),LogicalToDeviceY(start.y),
1080         LogicalToDeviceX(end.x),LogicalToDeviceY(end.y), initialColour, destColour));
1081
1082     wxDouble xx = LogicalToDeviceX(rect.x);
1083     wxDouble yy = LogicalToDeviceY(rect.y);
1084     wxDouble ww = m_signX * LogicalToDeviceXRel(rect.width);
1085     wxDouble hh = m_signY * LogicalToDeviceYRel(rect.height);
1086
1087     if (ww == 0 || hh == 0)
1088         return;
1089
1090     if (ww < 0)
1091     {
1092         ww = -ww;
1093         xx = xx - ww;
1094     }
1095     if (hh < 0)
1096     {
1097         hh = -hh;
1098         yy = yy - hh;
1099     }
1100
1101     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1102     m_graphicContext->DrawRectangle(xx,yy,ww,hh);
1103     m_graphicContext->SetPen(m_pen);
1104 }
1105
1106 void wxGCDC::DoGradientFillConcentric(const wxRect& rect,
1107                                       const wxColour& initialColour,
1108                                       const wxColour& destColour,
1109                                       const wxPoint& circleCenter)
1110 {
1111     //Radius
1112     wxInt32 cx = rect.GetWidth() / 2;
1113     wxInt32 cy = rect.GetHeight() / 2;
1114     wxInt32 nRadius;
1115     if (cx < cy)
1116         nRadius = cx;
1117     else
1118         nRadius = cy;
1119
1120     wxDouble xx = LogicalToDeviceX(rect.x);
1121     wxDouble yy = LogicalToDeviceY(rect.y);
1122     wxDouble ww = m_signX * LogicalToDeviceXRel(rect.width);
1123     wxDouble hh = m_signY * LogicalToDeviceYRel(rect.height);
1124
1125     if (ww == 0 || hh == 0)
1126         return;
1127
1128     if (ww < 0)
1129     {
1130         ww = -ww;
1131         xx = xx - ww;
1132     }
1133     if (hh < 0)
1134     {
1135         hh = -hh;
1136         yy = yy - hh;
1137     }
1138
1139     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1140     m_graphicContext->SetBrush( wxBrush( destColour) );
1141     m_graphicContext->DrawRectangle( xx,yy,ww,hh);
1142
1143     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
1144         xx+LogicalToDeviceX(circleCenter.x),yy+LogicalToDeviceY(circleCenter.y),
1145         xx+LogicalToDeviceX(circleCenter.x),yy+LogicalToDeviceY(circleCenter.y),
1146         LogicalToDeviceXRel(nRadius),
1147         initialColour,destColour));
1148
1149     m_graphicContext->DrawRectangle( xx,yy,ww,hh);
1150     m_graphicContext->SetPen(m_pen);
1151 }
1152
1153 void wxGCDC::DoDrawCheckMark(wxCoord x, wxCoord y,
1154                              wxCoord width, wxCoord height)
1155 {
1156     wxDCBase::DoDrawCheckMark(x,y,width,height);
1157 }
1158
1159 #endif // wxUSE_GRAPHICS_CONTEXT