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 #ifndef wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
  31     #define wxMAC_USE_CORE_GRAPHICS_BLEND_MODES 0
  32 #endif
  33
  34 //-----------------------------------------------------------------------------
  35 // constants
  36 //-----------------------------------------------------------------------------
  37
  38 static const double RAD2DEG = 180.0 / M_PI;
  39
  40 //-----------------------------------------------------------------------------
  41 // Local functions
  42 //-----------------------------------------------------------------------------
  43
  44 static inline double DegToRad(double deg)
  45 {
  46     return (deg * M_PI) / 180.0;
  47 }
  48
  49 //-----------------------------------------------------------------------------
  50 // wxDC bridge class
  51 //-----------------------------------------------------------------------------
  52
  53 #ifdef __WXMAC__
  54 IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDCBase)
  55 #else
  56 IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDC)
  57 #endif
  58
  59 wxGCDC::wxGCDC()
  60 {
  61     Init();
  62 }
  63
  64 void wxGCDC::SetGraphicsContext( wxGraphicsContext* ctx )
  65 {
  66     delete m_graphicContext;
  67     m_graphicContext = ctx;
  68     if ( m_graphicContext )
  69     {
  70         m_matrixOriginal = m_graphicContext->GetTransform();
  71         m_ok = true;
  72     }
  73 }
  74
  75 wxGCDC::wxGCDC(const wxWindowDC& dc)
  76 {
  77     Init();
  78     SetGraphicsContext( wxGraphicsContext::Create(dc) );
  79     if ( dc.GetFont().Ok())
  80         m_graphicContext->SetFont( m_graphicContext->CreateFont(dc.GetFont(),dc.GetTextForeground()));
  81     if ( dc.GetPen().Ok())
  82         m_graphicContext->SetPen( m_graphicContext->CreatePen(dc.GetPen()));
  83     if ( dc.GetBrush().Ok())
  84         m_graphicContext->SetBrush( m_graphicContext->CreateBrush(dc.GetBrush()));
  85 }
  86
  87 void wxGCDC::Init()
  88 {
  89     m_ok = false;
  90     m_colour = true;
  91     m_mm_to_pix_x = mm2pt;
  92     m_mm_to_pix_y = mm2pt;
  93
  94     m_pen = *wxBLACK_PEN;
  95     m_font = *wxNORMAL_FONT;
  96     m_brush = *wxWHITE_BRUSH;
  97
  98     m_graphicContext = NULL;
  99 }
 100
 101
 102 wxGCDC::~wxGCDC()
 103 {
 104     delete m_graphicContext;
 105 }
 106
 107 void wxGCDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool WXUNUSED(useMask) )
 108 {
 109     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
 110     wxCHECK_RET( bmp.Ok(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
 111
 112     if ( bmp.GetDepth() == 1 )
 113     {
 114         m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 115         m_graphicContext->SetBrush( wxBrush( m_textBackgroundColour , wxSOLID ) );
 116         m_graphicContext->DrawRectangle( x , y , bmp.GetWidth() , bmp.GetHeight() );
 117         m_graphicContext->SetBrush( wxBrush( m_textForegroundColour , wxSOLID ) );
 118         m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
 119         m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
 120         m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
 121     }
 122     else
 123         m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
 124 }
 125
 126 void wxGCDC::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
 127 {
 128     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
 129     wxCHECK_RET( icon.Ok(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
 130
 131     wxCoord w = icon.GetWidth();
 132     wxCoord h = icon.GetHeight();
 133
 134     m_graphicContext->DrawIcon( icon , x, y, w, h );
 135 }
 136
 137 void wxGCDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
 138 {
 139     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
 140
 141     m_graphicContext->Clip( x, y, w, h );
 142     if ( m_clipping )
 143     {
 144         m_clipX1 = wxMax( m_clipX1, x );
 145         m_clipY1 = wxMax( m_clipY1, y );
 146         m_clipX2 = wxMin( m_clipX2, (x + w) );
 147         m_clipY2 = wxMin( m_clipY2, (y + h) );
 148     }
 149     else
 150     {
 151         m_clipping = true;
 152
 153         m_clipX1 = x;
 154         m_clipY1 = y;
 155         m_clipX2 = x + w;
 156         m_clipY2 = y + h;
 157     }
 158 }
 159
 160 void wxGCDC::DoSetClippingRegionAsRegion( const wxRegion &region )
 161 {
 162     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoSetClippingRegionAsRegion - invalid DC") );
 163
 164     if (region.Empty())
 165     {
 166         DestroyClippingRegion();
 167         return;
 168     }
 169
 170     wxCoord x, y, w, h;
 171     region.GetBox( x, y, w, h );
 172
 173     m_graphicContext->Clip( region );
 174     if ( m_clipping )
 175     {
 176         m_clipX1 = wxMax( m_clipX1, x );
 177         m_clipY1 = wxMax( m_clipY1, y );
 178         m_clipX2 = wxMin( m_clipX2, (x + w) );
 179         m_clipY2 = wxMin( m_clipY2, (y + h) );
 180     }
 181     else
 182     {
 183         m_clipping = true;
 184
 185         m_clipX1 = x;
 186         m_clipY1 = y;
 187         m_clipX2 = x + w;
 188         m_clipY2 = y + h;
 189     }
 190 }
 191
 192 void wxGCDC::DestroyClippingRegion()
 193 {
 194     m_graphicContext->ResetClip();
 195     m_graphicContext->SetPen( m_pen );
 196     m_graphicContext->SetBrush( m_brush );
 197
 198     m_clipping = false;
 199 }
 200
 201 void wxGCDC::DoGetSizeMM( int* width, int* height ) const
 202 {
 203     int w = 0, h = 0;
 204
 205     GetSize( &w, &h );
 206     if (width)
 207         *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
 208     if (height)
 209         *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
 210 }
 211
 212 void wxGCDC::SetTextForeground( const wxColour &col )
 213 {
 214     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 215
 216     if ( col != m_textForegroundColour )
 217     {
 218         m_textForegroundColour = col;
 219         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 220     }
 221 }
 222
 223 void wxGCDC::SetTextBackground( const wxColour &col )
 224 {
 225     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 226
 227     m_textBackgroundColour = col;
 228 }
 229
 230 void wxGCDC::SetMapMode( int mode )
 231 {
 232     switch (mode)
 233     {
 234     case wxMM_TWIPS:
 235         SetLogicalScale( twips2mm * m_mm_to_pix_x, twips2mm * m_mm_to_pix_y );
 236         break;
 237
 238     case wxMM_POINTS:
 239         SetLogicalScale( pt2mm * m_mm_to_pix_x, pt2mm * m_mm_to_pix_y );
 240         break;
 241
 242     case wxMM_METRIC:
 243         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 244         break;
 245
 246     case wxMM_LOMETRIC:
 247         SetLogicalScale( m_mm_to_pix_x / 10.0, m_mm_to_pix_y / 10.0 );
 248         break;
 249
 250     case wxMM_TEXT:
 251     default:
 252         SetLogicalScale( 1.0, 1.0 );
 253         break;
 254     }
 255
 256     ComputeScaleAndOrigin();
 257 }
 258
 259 void wxGCDC::SetUserScale( double x, double y )
 260 {
 261     // allow negative ? -> no
 262
 263     m_userScaleX = x;
 264     m_userScaleY = y;
 265     ComputeScaleAndOrigin();
 266 }
 267
 268 void wxGCDC::SetLogicalScale( double x, double y )
 269 {
 270     // allow negative ?
 271     m_logicalScaleX = x;
 272     m_logicalScaleY = y;
 273     ComputeScaleAndOrigin();
 274 }
 275
 276 void wxGCDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 277 {
 278     m_logicalOriginX = x * m_signX;   // is this still correct ?
 279     m_logicalOriginY = y * m_signY;
 280     ComputeScaleAndOrigin();
 281 }
 282
 283 void wxGCDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 284 {
 285     m_deviceOriginX = x;
 286     m_deviceOriginY = y;
 287     ComputeScaleAndOrigin();
 288 }
 289
 290 void wxGCDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 291 {
 292     m_signX = (xLeftRight ?  1 : -1);
 293     m_signY = (yBottomUp ? -1 :  1);
 294     ComputeScaleAndOrigin();
 295 }
 296
 297 wxSize wxGCDC::GetPPI() const
 298 {
 299     return wxSize(72, 72);
 300 }
 301
 302 int wxGCDC::GetDepth() const
 303 {
 304     return 32;
 305 }
 306
 307 void wxGCDC::ComputeScaleAndOrigin()
 308 {
 309     m_scaleX = m_logicalScaleX * m_userScaleX;
 310     m_scaleY = m_logicalScaleY * m_userScaleY;
 311
 312     m_matrixCurrent = m_graphicContext->CreateMatrix();
 313     m_matrixCurrent.Translate( m_deviceOriginX, m_deviceOriginY );
 314     m_matrixCurrent.Scale( m_scaleX, m_scaleY );
 315     // the logical origin sets the origin to have new coordinates
 316     m_matrixCurrent.Translate( -m_logicalOriginX, -m_logicalOriginY );
 317
 318     m_graphicContext->SetTransform( m_matrixOriginal );
 319     m_graphicContext->ConcatTransform( m_matrixCurrent );
 320 }
 321
 322 void wxGCDC::SetPalette( const wxPalette& WXUNUSED(palette) )
 323 {
 324
 325 }
 326
 327 void wxGCDC::SetBackgroundMode( int mode )
 328 {
 329     m_backgroundMode = mode;
 330 }
 331
 332 void wxGCDC::SetFont( const wxFont &font )
 333 {
 334     m_font = font;
 335     if ( m_graphicContext )
 336     {
 337         wxFont f = font;
 338         if ( f.Ok() )
 339             f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
 340         m_graphicContext->SetFont( f, m_textForegroundColour );
 341     }
 342 }
 343
 344 void wxGCDC::SetPen( const wxPen &pen )
 345 {
 346     if ( m_pen == pen )
 347         return;
 348
 349     m_pen = pen;
 350     if ( m_graphicContext )
 351     {
 352         m_graphicContext->SetPen( m_pen );
 353     }
 354 }
 355
 356 void wxGCDC::SetBrush( const wxBrush &brush )
 357 {
 358     if (m_brush == brush)
 359         return;
 360
 361     m_brush = brush;
 362     if ( m_graphicContext )
 363     {
 364         m_graphicContext->SetBrush( m_brush );
 365     }
 366 }
 367
 368 void wxGCDC::SetBackground( const wxBrush &brush )
 369 {
 370     if (m_backgroundBrush == brush)
 371         return;
 372
 373     m_backgroundBrush = brush;
 374     if (!m_backgroundBrush.Ok())
 375         return;
 376 }
 377
 378 void wxGCDC::SetLogicalFunction( int function )
 379 {
 380     if (m_logicalFunction == function)
 381         return;
 382
 383     m_logicalFunction = function;
 384 #if wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
 385
 386     CGContextRef cgContext = ((wxCairoContext*)(m_graphicContext))->GetNativeContext();
 387     if ( m_logicalFunction == wxCOPY )
 388         CGContextSetBlendMode( cgContext, kCGBlendModeNormal );
 389     else if ( m_logicalFunction == wxINVERT )
 390         CGContextSetBlendMode( cgContext, kCGBlendModeExclusion );
 391     else
 392         CGContextSetBlendMode( cgContext, kCGBlendModeNormal );
 393 #endif
 394
 395 }
 396
 397 bool wxGCDC::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 398                          const wxColour& WXUNUSED(col), int WXUNUSED(style))
 399 {
 400     return false;
 401 }
 402
 403 bool wxGCDC::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 404 {
 405     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 406     return false;
 407 }
 408
 409 void wxGCDC::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 410 {
 411     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 412
 413 #if !wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
 414
 415     if ( m_logicalFunction != wxCOPY )
 416         return;
 417 #endif
 418
 419     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 420
 421     CalcBoundingBox(x1, y1);
 422     CalcBoundingBox(x2, y2);
 423 }
 424
 425 void wxGCDC::DoCrossHair( wxCoord x, wxCoord y )
 426 {
 427     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 428
 429     if ( m_logicalFunction != wxCOPY )
 430         return;
 431
 432     int w = 0, h = 0;
 433
 434     GetSize( &w, &h );
 435
 436     m_graphicContext->StrokeLine(0,y,w,y);
 437     m_graphicContext->StrokeLine(x,0,x,h);
 438
 439     CalcBoundingBox(0, 0);
 440     CalcBoundingBox(0+w, 0+h);
 441 }
 442
 443 void wxGCDC::DoDrawArc( wxCoord x1, wxCoord y1,
 444                         wxCoord x2, wxCoord y2,
 445                         wxCoord xc, wxCoord yc )
 446 {
 447     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 448
 449     if ( m_logicalFunction != wxCOPY )
 450         return;
 451
 452     double dx = x1 - xc;
 453     double dy = y1 - yc;
 454     double radius = sqrt((double)(dx * dx + dy * dy));
 455     wxCoord rad = (wxCoord)radius;
 456     double sa, ea;
 457     if (x1 == x2 && y1 == y2)
 458     {
 459         sa = 0.0;
 460         ea = 360.0;
 461     }
 462     else if (radius == 0.0)
 463     {
 464         sa = ea = 0.0;
 465     }
 466     else
 467     {
 468         sa = (x1 - xc == 0) ?
 469      (y1 - yc < 0) ? 90.0 : -90.0 :
 470              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 471         ea = (x2 - xc == 0) ?
 472      (y2 - yc < 0) ? 90.0 : -90.0 :
 473              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 474     }
 475
 476     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 477
 478     wxGraphicsPath path = m_graphicContext->CreatePath();
 479     if ( fill && ((x1!=x2)||(y1!=y2)) )
 480         path.MoveToPoint( xc, yc );
 481     path.AddArc( xc, yc , rad , DegToRad(sa) , DegToRad(ea), false );
 482     if ( fill && ((x1!=x2)||(y1!=y2)) )
 483         path.AddLineToPoint( xc, yc );
 484     m_graphicContext->DrawPath(path);
 485 }
 486
 487 void wxGCDC::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 488                                 double sa, double ea )
 489 {
 490     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 491
 492     if ( m_logicalFunction != wxCOPY )
 493         return;
 494
 495     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 496
 497     wxGraphicsPath path = m_graphicContext->CreatePath();
 498     m_graphicContext->PushState();
 499     m_graphicContext->Translate(x+w/2,y+h/2);
 500     wxDouble factor = ((wxDouble) w) / h;
 501     m_graphicContext->Scale( factor , 1.0);
 502     if ( fill && (sa!=ea) )
 503         path.MoveToPoint(0,0);
 504     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 505     // get clockwise angles
 506     path.AddArc( 0, 0, h/2 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 507     if ( fill && (sa!=ea) )
 508         path.AddLineToPoint(0,0);
 509     m_graphicContext->DrawPath( path );
 510     m_graphicContext->PopState();
 511 }
 512
 513 void wxGCDC::DoDrawPoint( wxCoord x, wxCoord y )
 514 {
 515     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 516
 517     DoDrawLine( x , y , x + 1 , y + 1 );
 518 }
 519
 520 void wxGCDC::DoDrawLines(int n, wxPoint points[],
 521                          wxCoord xoffset, wxCoord yoffset)
 522 {
 523     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 524
 525 #if !wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
 526
 527     if ( m_logicalFunction != wxCOPY )
 528         return;
 529 #endif
 530
 531     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 532     for( int i = 0; i < n; ++i)
 533     {
 534         pointsD[i].m_x = points[i].x + xoffset;
 535         pointsD[i].m_y = points[i].y + yoffset;
 536     }
 537
 538     m_graphicContext->StrokeLines( n , pointsD);
 539     delete[] pointsD;
 540 }
 541
 542 #if wxUSE_SPLINES
 543 void wxGCDC::DoDrawSpline(wxList *points)
 544 {
 545     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 546
 547     if ( m_logicalFunction != wxCOPY )
 548         return;
 549
 550     wxGraphicsPath path = m_graphicContext->CreatePath();
 551
 552     wxList::compatibility_iterator node = points->GetFirst();
 553     if (node == wxList::compatibility_iterator())
 554         // empty list
 555         return;
 556
 557     wxPoint *p = (wxPoint *)node->GetData();
 558
 559     wxCoord x1 = p->x;
 560     wxCoord y1 = p->y;
 561
 562     node = node->GetNext();
 563     p = (wxPoint *)node->GetData();
 564
 565     wxCoord x2 = p->x;
 566     wxCoord y2 = p->y;
 567     wxCoord cx1 = ( x1 + x2 ) / 2;
 568     wxCoord cy1 = ( y1 + y2 ) / 2;
 569
 570     path.MoveToPoint( x1 , y1 );
 571     path.AddLineToPoint( cx1 , cy1 );
 572 #if !wxUSE_STL
 573
 574     while ((node = node->GetNext()) != NULL)
 575 #else
 576
 577     while ((node = node->GetNext()))
 578 #endif // !wxUSE_STL
 579
 580     {
 581         p = (wxPoint *)node->GetData();
 582         x1 = x2;
 583         y1 = y2;
 584         x2 = p->x;
 585         y2 = p->y;
 586         wxCoord cx4 = (x1 + x2) / 2;
 587         wxCoord cy4 = (y1 + y2) / 2;
 588
 589         path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 590
 591         cx1 = cx4;
 592         cy1 = cy4;
 593     }
 594
 595     path.AddLineToPoint( x2 , y2 );
 596
 597     m_graphicContext->StrokePath( path );
 598 }
 599 #endif // wxUSE_SPLINES
 600
 601 void wxGCDC::DoDrawPolygon( int n, wxPoint points[],
 602                             wxCoord xoffset, wxCoord yoffset,
 603                             int fillStyle )
 604 {
 605     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 606
 607     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 608         return;
 609     if ( m_logicalFunction != wxCOPY )
 610         return;
 611
 612     bool closeIt = false;
 613     if (points[n-1] != points[0])
 614         closeIt = true;
 615
 616     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 617     for( int i = 0; i < n; ++i)
 618     {
 619         pointsD[i].m_x = points[i].x + xoffset;
 620         pointsD[i].m_y = points[i].y + yoffset;
 621     }
 622     if ( closeIt )
 623         pointsD[n] = pointsD[0];
 624
 625     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 626     delete[] pointsD;
 627 }
 628
 629 void wxGCDC::DoDrawPolyPolygon(int n,
 630                                int count[],
 631                                wxPoint points[],
 632                                wxCoord xoffset,
 633                                wxCoord yoffset,
 634                                int fillStyle)
 635 {
 636     wxASSERT(n > 1);
 637     wxGraphicsPath path = m_graphicContext->CreatePath();
 638
 639     int i = 0;
 640     for ( int j = 0; j < n; ++j)
 641     {
 642         wxPoint start = points[i];
 643         path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
 644         ++i;
 645         int l = count[j];
 646         for ( int k = 1; k < l; ++k)
 647         {
 648             path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
 649             ++i;
 650         }
 651         // close the polygon
 652         if ( start != points[i-1])
 653             path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
 654     }
 655     m_graphicContext->DrawPath( path , fillStyle);
 656 }
 657
 658 void wxGCDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 659 {
 660     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 661
 662     if ( m_logicalFunction != wxCOPY )
 663         return;
 664
 665     // CMB: draw nothing if transformed w or h is 0
 666     if (w == 0 || h == 0)
 667         return;
 668
 669     if ( m_graphicContext->ShouldOffset() )
 670     {
 671         // if we are offsetting the entire rectangle is moved 0.5, so the
 672         // border line gets off by 1
 673         w -= 1;
 674         h -= 1;
 675     }
 676     m_graphicContext->DrawRectangle(x,y,w,h);
 677 }
 678
 679 void wxGCDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 680                                     wxCoord w, wxCoord h,
 681                                     double radius)
 682 {
 683     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 684
 685     if ( m_logicalFunction != wxCOPY )
 686         return;
 687
 688     if (radius < 0.0)
 689         radius = - radius * ((w < h) ? w : h);
 690
 691     // CMB: draw nothing if transformed w or h is 0
 692     if (w == 0 || h == 0)
 693         return;
 694
 695     m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
 696 }
 697
 698 void wxGCDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 699 {
 700     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 701
 702     if ( m_logicalFunction != wxCOPY )
 703         return;
 704
 705     m_graphicContext->DrawEllipse(x,y,w,h);
 706 }
 707
 708 bool wxGCDC::CanDrawBitmap() const
 709 {
 710     return true;
 711 }
 712
 713 bool wxGCDC::DoBlit(
 714     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 715     wxDC *source, wxCoord xsrc, wxCoord ysrc, int logical_func , bool WXUNUSED(useMask),
 716     wxCoord xsrcMask, wxCoord ysrcMask )
 717 {
 718     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::DoBlit - invalid DC") );
 719     wxCHECK_MSG( source->Ok(), false, wxT("wxGCDC(cg)::DoBlit - invalid source DC") );
 720
 721     if ( logical_func == wxNO_OP )
 722         return true;
 723     else if ( logical_func != wxCOPY )
 724     {
 725         wxFAIL_MSG( wxT("Blitting is only supported with wxCOPY logical operation.") );
 726         return false;
 727     }
 728
 729     if (xsrcMask == -1 && ysrcMask == -1)
 730     {
 731         xsrcMask = xsrc;
 732         ysrcMask = ysrc;
 733     }
 734
 735     wxRect subrect(source-> LogicalToDeviceX(xsrc),source-> LogicalToDeviceY(ysrc),
 736         source-> LogicalToDeviceXRel(width),source-> LogicalToDeviceYRel(height));
 737
 738     wxBitmap blit = source->GetAsBitmap( &subrect );
 739
 740     if ( blit.Ok() )
 741     {
 742         m_graphicContext->DrawBitmap( blit, xdest , ydest , width , height );
 743     }
 744     else
 745     {
 746         wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
 747         return false;
 748     }
 749
 750     return true;
 751 }
 752
 753 void wxGCDC::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 754                                double angle)
 755 {
 756     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 757
 758     if ( str.length() == 0 )
 759         return;
 760     if ( m_logicalFunction != wxCOPY )
 761         return;
 762
 763      m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 764 }
 765
 766 void wxGCDC::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 767 {
 768     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 769
 770     if ( str.length() == 0 )
 771         return;
 772     if ( m_logicalFunction != wxCOPY )
 773         return;
 774
 775     m_graphicContext->DrawText( str, x ,y);
 776 }
 777
 778 bool wxGCDC::CanGetTextExtent() const
 779 {
 780     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 781
 782     return true;
 783 }
 784
 785 void wxGCDC::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
 786                               wxCoord *descent, wxCoord *externalLeading ,
 787                               wxFont *theFont ) const
 788 {
 789     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 790
 791     if ( theFont )
 792     {
 793         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
 794     }
 795
 796     wxDouble h , d , e , w;
 797
 798     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
 799
 800     if ( height )
 801         *height = (wxCoord)h;
 802     if ( descent )
 803         *descent = (wxCoord)d;
 804     if ( externalLeading )
 805         *externalLeading = (wxCoord)e;
 806     if ( width )
 807         *width = (wxCoord)w;
 808
 809     if ( theFont )
 810     {
 811         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 812     }
 813 }
 814
 815 bool wxGCDC::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 816 {
 817     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
 818     widths.Clear();
 819     widths.Add(0,text.Length());
 820     if ( text.IsEmpty() )
 821         return true;
 822
 823     wxArrayDouble widthsD;
 824
 825     m_graphicContext->GetPartialTextExtents( text, widthsD );
 826     for ( size_t i = 0; i < widths.GetCount(); ++i )
 827         widths[i] = (wxCoord)(widthsD[i] + 0.5);
 828
 829     return true;
 830 }
 831
 832 wxCoord wxGCDC::GetCharWidth(void) const
 833 {
 834     wxCoord width;
 835     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
 836
 837     return width;
 838 }
 839
 840 wxCoord wxGCDC::GetCharHeight(void) const
 841 {
 842     wxCoord height;
 843     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
 844
 845     return height;
 846 }
 847
 848 void wxGCDC::Clear(void)
 849 {
 850     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::Clear - invalid DC") );
 851     // TODO better implementation / incorporate size info into wxGCDC or context
 852     m_graphicContext->SetBrush( m_backgroundBrush );
 853     wxPen p = *wxTRANSPARENT_PEN;
 854     m_graphicContext->SetPen( p );
 855     DoDrawRectangle( 0, 0, 32000 , 32000 );
 856     m_graphicContext->SetPen( m_pen );
 857     m_graphicContext->SetBrush( m_brush );
 858 }
 859
 860 void wxGCDC::DoGetSize(int *width, int *height) const
 861 {
 862     *width = 1000;
 863     *height = 1000;
 864 }
 865
 866 void wxGCDC::DoGradientFillLinear(const wxRect& rect,
 867                                   const wxColour& initialColour,
 868                                   const wxColour& destColour,
 869                                   wxDirection nDirection )
 870 {
 871     wxPoint start;
 872     wxPoint end;
 873     switch( nDirection)
 874     {
 875     case wxWEST :
 876         start = rect.GetRightBottom();
 877         start.x++;
 878         end = rect.GetLeftBottom();
 879         break;
 880     case wxEAST :
 881         start = rect.GetLeftBottom();
 882         end = rect.GetRightBottom();
 883         end.x++;
 884         break;
 885     case wxNORTH :
 886         start = rect.GetLeftBottom();
 887         start.y++;
 888         end = rect.GetLeftTop();
 889         break;
 890     case wxSOUTH :
 891         start = rect.GetLeftTop();
 892         end = rect.GetLeftBottom();
 893         end.y++;
 894         break;
 895     default :
 896         break;
 897     }
 898
 899     if (rect.width == 0 || rect.height == 0)
 900         return;
 901
 902     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
 903         start.x,start.y,end.x,end.y, initialColour, destColour));
 904     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 905     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 906     m_graphicContext->SetPen(m_pen);
 907 }
 908
 909 void wxGCDC::DoGradientFillConcentric(const wxRect& rect,
 910                                       const wxColour& initialColour,
 911                                       const wxColour& destColour,
 912                                       const wxPoint& circleCenter)
 913 {
 914     //Radius
 915     wxInt32 cx = rect.GetWidth() / 2;
 916     wxInt32 cy = rect.GetHeight() / 2;
 917     wxInt32 nRadius;
 918     if (cx < cy)
 919         nRadius = cx;
 920     else
 921         nRadius = cy;
 922
 923     // make sure the background is filled (todo move into specific platform implementation ?)
 924     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 925     m_graphicContext->SetBrush( wxBrush( destColour) );
 926     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 927
 928     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
 929         rect.x+circleCenter.x,rect.y+circleCenter.y,
 930         rect.x+circleCenter.x,rect.y+circleCenter.y,
 931         nRadius,initialColour,destColour));
 932
 933     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 934     m_graphicContext->SetPen(m_pen);
 935 }
 936
 937 void wxGCDC::DoDrawCheckMark(wxCoord x, wxCoord y,
 938                              wxCoord width, wxCoord height)
 939 {
 940     wxDCBase::DoDrawCheckMark(x,y,width,height);
 941 }
 942
 943 #endif // wxUSE_GRAPHICS_CONTEXT