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     if ( m_graphicContext )
  65     {
  66         m_matrixOriginal = m_graphicContext->GetTransform();
  67         m_ok = true;
  68         // apply the stored transformations to the passed in context
  69         ComputeScaleAndOrigin();
  70         m_graphicContext->SetFont( m_font , m_textForegroundColour );
  71         m_graphicContext->SetPen( m_pen );
  72         m_graphicContext->SetBrush( m_brush);
  73     }
  74 }
  75
  76 wxGCDC::wxGCDC(const wxWindowDC& dc)
  77 {
  78     Init();
  79     SetGraphicsContext( wxGraphicsContext::Create(dc) );
  80 }
  81
  82 #ifdef __WXMSW__
  83 wxGCDC::wxGCDC(const wxMemoryDC& dc)
  84 {
  85     Init();
  86     SetGraphicsContext( wxGraphicsContext::Create(dc) );
  87 }
  88 #endif
  89
  90 void wxGCDC::Init()
  91 {
  92     m_ok = false;
  93     m_colour = true;
  94     m_mm_to_pix_x = mm2pt;
  95     m_mm_to_pix_y = mm2pt;
  96
  97     m_pen = *wxBLACK_PEN;
  98     m_font = *wxNORMAL_FONT;
  99     m_brush = *wxWHITE_BRUSH;
 100
 101     m_graphicContext = NULL;
 102     m_logicalFunctionSupported = true;
 103 }
 104
 105
 106 wxGCDC::~wxGCDC()
 107 {
 108     delete m_graphicContext;
 109 }
 110
 111 void wxGCDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool WXUNUSED(useMask) )
 112 {
 113     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
 114     wxCHECK_RET( bmp.Ok(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
 115
 116     if ( bmp.GetDepth() == 1 )
 117     {
 118         m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 119         m_graphicContext->SetBrush( wxBrush( m_textBackgroundColour , wxSOLID ) );
 120         m_graphicContext->DrawRectangle( x , y , bmp.GetWidth() , bmp.GetHeight() );
 121         m_graphicContext->SetBrush( wxBrush( m_textForegroundColour , wxSOLID ) );
 122         m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
 123         m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
 124         m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
 125     }
 126     else
 127         m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
 128 }
 129
 130 void wxGCDC::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
 131 {
 132     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
 133     wxCHECK_RET( icon.Ok(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
 134
 135     wxCoord w = icon.GetWidth();
 136     wxCoord h = icon.GetHeight();
 137
 138     m_graphicContext->DrawIcon( icon , x, y, w, h );
 139 }
 140
 141 void wxGCDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
 142 {
 143     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
 144
 145     m_graphicContext->Clip( x, y, w, h );
 146     if ( m_clipping )
 147     {
 148         m_clipX1 = wxMax( m_clipX1, x );
 149         m_clipY1 = wxMax( m_clipY1, y );
 150         m_clipX2 = wxMin( m_clipX2, (x + w) );
 151         m_clipY2 = wxMin( m_clipY2, (y + h) );
 152     }
 153     else
 154     {
 155         m_clipping = true;
 156
 157         m_clipX1 = x;
 158         m_clipY1 = y;
 159         m_clipX2 = x + w;
 160         m_clipY2 = y + h;
 161     }
 162 }
 163
 164 void wxGCDC::DoSetClippingRegionAsRegion( const wxRegion &region )
 165 {
 166     // region is in device coordinates
 167     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoSetClippingRegionAsRegion - invalid DC") );
 168
 169     if (region.Empty())
 170     {
 171         DestroyClippingRegion();
 172         return;
 173     }
 174
 175     wxRegion logRegion( region );
 176     wxCoord x, y, w, h;
 177
 178     logRegion.Offset( DeviceToLogicalX(0), DeviceToLogicalY(0) );
 179     logRegion.GetBox( x, y, w, h );
 180
 181     m_graphicContext->Clip( logRegion );
 182     if ( m_clipping )
 183     {
 184         m_clipX1 = wxMax( m_clipX1, x );
 185         m_clipY1 = wxMax( m_clipY1, y );
 186         m_clipX2 = wxMin( m_clipX2, (x + w) );
 187         m_clipY2 = wxMin( m_clipY2, (y + h) );
 188     }
 189     else
 190     {
 191         m_clipping = true;
 192
 193         m_clipX1 = x;
 194         m_clipY1 = y;
 195         m_clipX2 = x + w;
 196         m_clipY2 = y + h;
 197     }
 198 }
 199
 200 void wxGCDC::DestroyClippingRegion()
 201 {
 202     m_graphicContext->ResetClip();
 203     // currently the clip eg of a window extends to the area between the scrollbars
 204     // so we must explicitely make sure it only covers the area we want it to draw
 205     int width, height ;
 206     GetSize( &width , &height ) ;
 207     m_graphicContext->Clip( DeviceToLogicalX(0) , DeviceToLogicalY(0) , width, height );
 208
 209     m_graphicContext->SetPen( m_pen );
 210     m_graphicContext->SetBrush( m_brush );
 211
 212     m_clipping = false;
 213 }
 214
 215 void wxGCDC::DoGetSizeMM( int* width, int* height ) const
 216 {
 217     int w = 0, h = 0;
 218
 219     GetSize( &w, &h );
 220     if (width)
 221         *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
 222     if (height)
 223         *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
 224 }
 225
 226 void wxGCDC::SetTextForeground( const wxColour &col )
 227 {
 228     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 229
 230     if ( col != m_textForegroundColour )
 231     {
 232         m_textForegroundColour = col;
 233         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 234     }
 235 }
 236
 237 void wxGCDC::SetTextBackground( const wxColour &col )
 238 {
 239     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 240
 241     m_textBackgroundColour = col;
 242 }
 243
 244 void wxGCDC::SetMapMode( int mode )
 245 {
 246     switch (mode)
 247     {
 248     case wxMM_TWIPS:
 249         SetLogicalScale( twips2mm * m_mm_to_pix_x, twips2mm * m_mm_to_pix_y );
 250         break;
 251
 252     case wxMM_POINTS:
 253         SetLogicalScale( pt2mm * m_mm_to_pix_x, pt2mm * m_mm_to_pix_y );
 254         break;
 255
 256     case wxMM_METRIC:
 257         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 258         break;
 259
 260     case wxMM_LOMETRIC:
 261         SetLogicalScale( m_mm_to_pix_x / 10.0, m_mm_to_pix_y / 10.0 );
 262         break;
 263
 264     case wxMM_TEXT:
 265     default:
 266         SetLogicalScale( 1.0, 1.0 );
 267         break;
 268     }
 269
 270     ComputeScaleAndOrigin();
 271 }
 272
 273 void wxGCDC::SetUserScale( double x, double y )
 274 {
 275     // allow negative ? -> no
 276
 277     m_userScaleX = x;
 278     m_userScaleY = y;
 279     ComputeScaleAndOrigin();
 280 }
 281
 282 void wxGCDC::SetLogicalScale( double x, double y )
 283 {
 284     // allow negative ?
 285     m_logicalScaleX = x;
 286     m_logicalScaleY = y;
 287     ComputeScaleAndOrigin();
 288 }
 289
 290 void wxGCDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 291 {
 292     m_logicalOriginX = x * m_signX;   // is this still correct ?
 293     m_logicalOriginY = y * m_signY;
 294     ComputeScaleAndOrigin();
 295 }
 296
 297 void wxGCDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 298 {
 299     m_deviceOriginX = x;
 300     m_deviceOriginY = y;
 301     ComputeScaleAndOrigin();
 302 }
 303
 304 void wxGCDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 305 {
 306     m_signX = (xLeftRight ?  1 : -1);
 307     m_signY = (yBottomUp ? -1 :  1);
 308     ComputeScaleAndOrigin();
 309 }
 310
 311 wxSize wxGCDC::GetPPI() const
 312 {
 313     return wxSize(72, 72);
 314 }
 315
 316 int wxGCDC::GetDepth() const
 317 {
 318     return 32;
 319 }
 320
 321 void wxGCDC::ComputeScaleAndOrigin()
 322 {
 323     m_scaleX = m_logicalScaleX * m_userScaleX;
 324     m_scaleY = m_logicalScaleY * m_userScaleY;
 325
 326     if ( m_graphicContext )
 327     {
 328         m_matrixCurrent = m_graphicContext->CreateMatrix();
 329         m_matrixCurrent.Translate( m_deviceOriginX, m_deviceOriginY );
 330         m_matrixCurrent.Scale( m_scaleX, m_scaleY );
 331         // the logical origin sets the origin to have new coordinates
 332         m_matrixCurrent.Translate( -m_logicalOriginX, -m_logicalOriginY );
 333
 334         m_graphicContext->SetTransform( m_matrixOriginal );
 335         m_graphicContext->ConcatTransform( m_matrixCurrent );
 336     }
 337 }
 338
 339 void wxGCDC::SetPalette( const wxPalette& WXUNUSED(palette) )
 340 {
 341
 342 }
 343
 344 void wxGCDC::SetBackgroundMode( int mode )
 345 {
 346     m_backgroundMode = mode;
 347 }
 348
 349 void wxGCDC::SetFont( const wxFont &font )
 350 {
 351     m_font = font;
 352     if ( m_graphicContext )
 353     {
 354         wxFont f = font;
 355         if ( f.Ok() )
 356             f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
 357         m_graphicContext->SetFont( f, m_textForegroundColour );
 358     }
 359 }
 360
 361 void wxGCDC::SetPen( const wxPen &pen )
 362 {
 363     if ( m_pen == pen )
 364         return;
 365
 366     m_pen = pen;
 367     if ( m_graphicContext )
 368     {
 369         m_graphicContext->SetPen( m_pen );
 370     }
 371 }
 372
 373 void wxGCDC::SetBrush( const wxBrush &brush )
 374 {
 375     if (m_brush == brush)
 376         return;
 377
 378     m_brush = brush;
 379     if ( m_graphicContext )
 380     {
 381         m_graphicContext->SetBrush( m_brush );
 382     }
 383 }
 384
 385 void wxGCDC::SetBackground( const wxBrush &brush )
 386 {
 387     if (m_backgroundBrush == brush)
 388         return;
 389
 390     m_backgroundBrush = brush;
 391     if (!m_backgroundBrush.Ok())
 392         return;
 393 }
 394
 395 void wxGCDC::SetLogicalFunction( int function )
 396 {
 397     if (m_logicalFunction == function)
 398         return;
 399
 400     m_logicalFunction = function;
 401     if ( m_graphicContext->SetLogicalFunction( function ) )
 402         m_logicalFunctionSupported=true;
 403     else
 404         m_logicalFunctionSupported=false;
 405 }
 406
 407 bool wxGCDC::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 408                          const wxColour& WXUNUSED(col), int WXUNUSED(style))
 409 {
 410     return false;
 411 }
 412
 413 bool wxGCDC::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 414 {
 415     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 416     return false;
 417 }
 418
 419 void wxGCDC::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 420 {
 421     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 422
 423     if ( !m_logicalFunctionSupported )
 424         return;
 425
 426     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 427
 428     CalcBoundingBox(x1, y1);
 429     CalcBoundingBox(x2, y2);
 430 }
 431
 432 void wxGCDC::DoCrossHair( wxCoord x, wxCoord y )
 433 {
 434     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 435
 436     if ( !m_logicalFunctionSupported )
 437         return;
 438
 439     int w = 0, h = 0;
 440
 441     GetSize( &w, &h );
 442
 443     m_graphicContext->StrokeLine(0,y,w,y);
 444     m_graphicContext->StrokeLine(x,0,x,h);
 445
 446     CalcBoundingBox(0, 0);
 447     CalcBoundingBox(0+w, 0+h);
 448 }
 449
 450 void wxGCDC::DoDrawArc( wxCoord x1, wxCoord y1,
 451                         wxCoord x2, wxCoord y2,
 452                         wxCoord xc, wxCoord yc )
 453 {
 454     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 455
 456     if ( !m_logicalFunctionSupported )
 457         return;
 458
 459     double dx = x1 - xc;
 460     double dy = y1 - yc;
 461     double radius = sqrt((double)(dx * dx + dy * dy));
 462     wxCoord rad = (wxCoord)radius;
 463     double sa, ea;
 464     if (x1 == x2 && y1 == y2)
 465     {
 466         sa = 0.0;
 467         ea = 360.0;
 468     }
 469     else if (radius == 0.0)
 470     {
 471         sa = ea = 0.0;
 472     }
 473     else
 474     {
 475         sa = (x1 - xc == 0) ?
 476      (y1 - yc < 0) ? 90.0 : -90.0 :
 477              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 478         ea = (x2 - xc == 0) ?
 479      (y2 - yc < 0) ? 90.0 : -90.0 :
 480              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 481     }
 482
 483     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 484
 485     wxGraphicsPath path = m_graphicContext->CreatePath();
 486     if ( fill && ((x1!=x2)||(y1!=y2)) )
 487         path.MoveToPoint( xc, yc );
 488     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 489     // get clockwise angles
 490     path.AddArc( xc, yc , rad , DegToRad(-sa) , DegToRad(-ea), false );
 491     if ( fill && ((x1!=x2)||(y1!=y2)) )
 492         path.AddLineToPoint( xc, yc );
 493     m_graphicContext->DrawPath(path);
 494 }
 495
 496 void wxGCDC::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 497                                 double sa, double ea )
 498 {
 499     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 500
 501     if ( !m_logicalFunctionSupported )
 502         return;
 503
 504     wxGraphicsPath path = m_graphicContext->CreatePath();
 505     m_graphicContext->PushState();
 506     m_graphicContext->Translate(x+w/2.0,y+h/2.0);
 507     wxDouble factor = ((wxDouble) w) / h;
 508     m_graphicContext->Scale( factor , 1.0);
 509
 510     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 511     // get clockwise angles
 512     path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 513     m_graphicContext->DrawPath( path );
 514     m_graphicContext->PopState();
 515 }
 516
 517 void wxGCDC::DoDrawPoint( wxCoord x, wxCoord y )
 518 {
 519     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 520
 521     DoDrawLine( x , y , x + 1 , y + 1 );
 522 }
 523
 524 void wxGCDC::DoDrawLines(int n, wxPoint points[],
 525                          wxCoord xoffset, wxCoord yoffset)
 526 {
 527     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 528
 529     if ( !m_logicalFunctionSupported )
 530         return;
 531
 532     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 533     for( int i = 0; i < n; ++i)
 534     {
 535         pointsD[i].m_x = points[i].x + xoffset;
 536         pointsD[i].m_y = points[i].y + yoffset;
 537     }
 538
 539     m_graphicContext->StrokeLines( n , pointsD);
 540     delete[] pointsD;
 541 }
 542
 543 #if wxUSE_SPLINES
 544 void wxGCDC::DoDrawSpline(const wxPointList *points)
 545 {
 546     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 547
 548     if ( !m_logicalFunctionSupported )
 549         return;
 550
 551     wxGraphicsPath path = m_graphicContext->CreatePath();
 552
 553     wxPointList::compatibility_iterator node = points->GetFirst();
 554     if (node == wxPointList::compatibility_iterator())
 555         // empty list
 556         return;
 557
 558     wxPoint *p = node->GetData();
 559
 560     wxCoord x1 = p->x;
 561     wxCoord y1 = p->y;
 562
 563     node = node->GetNext();
 564     p = node->GetData();
 565
 566     wxCoord x2 = p->x;
 567     wxCoord y2 = p->y;
 568     wxCoord cx1 = ( x1 + x2 ) / 2;
 569     wxCoord cy1 = ( y1 + y2 ) / 2;
 570
 571     path.MoveToPoint( x1 , y1 );
 572     path.AddLineToPoint( cx1 , cy1 );
 573 #if !wxUSE_STL
 574
 575     while ((node = node->GetNext()) != NULL)
 576 #else
 577
 578     while ((node = node->GetNext()))
 579 #endif // !wxUSE_STL
 580
 581     {
 582         p = node->GetData();
 583         x1 = x2;
 584         y1 = y2;
 585         x2 = p->x;
 586         y2 = p->y;
 587         wxCoord cx4 = (x1 + x2) / 2;
 588         wxCoord cy4 = (y1 + y2) / 2;
 589
 590         path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 591
 592         cx1 = cx4;
 593         cy1 = cy4;
 594     }
 595
 596     path.AddLineToPoint( x2 , y2 );
 597
 598     m_graphicContext->StrokePath( path );
 599 }
 600 #endif // wxUSE_SPLINES
 601
 602 void wxGCDC::DoDrawPolygon( int n, wxPoint points[],
 603                             wxCoord xoffset, wxCoord yoffset,
 604                             int fillStyle )
 605 {
 606     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 607
 608     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 609         return;
 610     if ( !m_logicalFunctionSupported )
 611         return;
 612
 613     bool closeIt = false;
 614     if (points[n-1] != points[0])
 615         closeIt = true;
 616
 617     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 618     for( int i = 0; i < n; ++i)
 619     {
 620         pointsD[i].m_x = points[i].x + xoffset;
 621         pointsD[i].m_y = points[i].y + yoffset;
 622     }
 623     if ( closeIt )
 624         pointsD[n] = pointsD[0];
 625
 626     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 627     delete[] pointsD;
 628 }
 629
 630 void wxGCDC::DoDrawPolyPolygon(int n,
 631                                int count[],
 632                                wxPoint points[],
 633                                wxCoord xoffset,
 634                                wxCoord yoffset,
 635                                int fillStyle)
 636 {
 637     wxASSERT(n > 1);
 638     wxGraphicsPath path = m_graphicContext->CreatePath();
 639
 640     int i = 0;
 641     for ( int j = 0; j < n; ++j)
 642     {
 643         wxPoint start = points[i];
 644         path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
 645         ++i;
 646         int l = count[j];
 647         for ( int k = 1; k < l; ++k)
 648         {
 649             path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
 650             ++i;
 651         }
 652         // close the polygon
 653         if ( start != points[i-1])
 654             path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
 655     }
 656     m_graphicContext->DrawPath( path , fillStyle);
 657 }
 658
 659 void wxGCDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 660 {
 661     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 662
 663     if ( !m_logicalFunctionSupported )
 664         return;
 665
 666     // CMB: draw nothing if transformed w or h is 0
 667     if (w == 0 || h == 0)
 668         return;
 669
 670     if ( m_graphicContext->ShouldOffset() )
 671     {
 672         // if we are offsetting the entire rectangle is moved 0.5, so the
 673         // border line gets off by 1
 674         w -= 1;
 675         h -= 1;
 676     }
 677     m_graphicContext->DrawRectangle(x,y,w,h);
 678 }
 679
 680 void wxGCDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 681                                     wxCoord w, wxCoord h,
 682                                     double radius)
 683 {
 684     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 685
 686     if ( !m_logicalFunctionSupported )
 687         return;
 688
 689     if (radius < 0.0)
 690         radius = - radius * ((w < h) ? w : h);
 691
 692     // CMB: draw nothing if transformed w or h is 0
 693     if (w == 0 || h == 0)
 694         return;
 695
 696     if ( m_graphicContext->ShouldOffset() )
 697     {
 698         // if we are offsetting the entire rectangle is moved 0.5, so the
 699         // border line gets off by 1
 700         w -= 1;
 701         h -= 1;
 702     }
 703     m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
 704 }
 705
 706 void wxGCDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 707 {
 708     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 709
 710     if ( !m_logicalFunctionSupported )
 711         return;
 712
 713     if ( m_graphicContext->ShouldOffset() )
 714     {
 715         // if we are offsetting the entire rectangle is moved 0.5, so the
 716         // border line gets off by 1
 717         w -= 1;
 718         h -= 1;
 719     }
 720     m_graphicContext->DrawEllipse(x,y,w,h);
 721 }
 722
 723 bool wxGCDC::CanDrawBitmap() const
 724 {
 725     return true;
 726 }
 727
 728 bool wxGCDC::DoBlit(
 729     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 730     wxDC *source, wxCoord xsrc, wxCoord ysrc, int logical_func , bool useMask,
 731     wxCoord xsrcMask, wxCoord ysrcMask )
 732 {
 733     return DoStretchBlit( xdest, ydest, width, height,
 734         source, xsrc, ysrc, width, height, logical_func, useMask,
 735         xsrcMask,ysrcMask );
 736 }
 737
 738 bool wxGCDC::DoStretchBlit(
 739     wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
 740     wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
 741     int logical_func , bool WXUNUSED(useMask),
 742     wxCoord xsrcMask, wxCoord ysrcMask )
 743 {
 744     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
 745     wxCHECK_MSG( source->Ok(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid source DC") );
 746
 747     if ( logical_func == wxNO_OP )
 748         return true;
 749     else if ( logical_func != wxCOPY )
 750     {
 751         wxFAIL_MSG( wxT("Blitting is only supported with wxCOPY logical operation.") );
 752         return false;
 753     }
 754
 755     if (xsrcMask == -1 && ysrcMask == -1)
 756     {
 757         xsrcMask = xsrc;
 758         ysrcMask = ysrc;
 759     }
 760
 761     wxRect subrect(source->LogicalToDeviceX(xsrc),
 762                    source->LogicalToDeviceY(ysrc),
 763                    source->LogicalToDeviceXRel(srcWidth),
 764                    source->LogicalToDeviceYRel(srcHeight));
 765
 766     // if needed clip the subrect down to the size of the source DC
 767     wxCoord sw, sh;
 768     source->GetSize(&sw, &sh);
 769     sw = source->LogicalToDeviceXRel(sw);
 770     sh = source->LogicalToDeviceYRel(sh);
 771     if (subrect.x + subrect.width > sw)
 772         subrect.width = sw - subrect.x;
 773     if (subrect.y + subrect.height > sh)
 774         subrect.height = sh - subrect.y;
 775
 776     wxBitmap blit = source->GetAsBitmap( &subrect );
 777
 778     if ( blit.Ok() )
 779     {
 780         m_graphicContext->DrawBitmap( blit, xdest, ydest,
 781                                       dstWidth, dstHeight);
 782     }
 783     else
 784     {
 785         wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
 786         return false;
 787     }
 788
 789     return true;
 790 }
 791
 792 void wxGCDC::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 793                                double angle)
 794 {
 795     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 796
 797     if ( str.length() == 0 )
 798         return;
 799     if ( !m_logicalFunctionSupported )
 800         return;
 801
 802     if ( m_backgroundMode == wxTRANSPARENT )
 803         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 804     else
 805         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ), m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 806 }
 807
 808 void wxGCDC::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 809 {
 810     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 811
 812     if ( str.length() == 0 )
 813         return;
 814
 815     if ( !m_logicalFunctionSupported )
 816         return;
 817
 818     if ( m_backgroundMode == wxTRANSPARENT )
 819         m_graphicContext->DrawText( str, x ,y);
 820     else
 821         m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 822 }
 823
 824 bool wxGCDC::CanGetTextExtent() const
 825 {
 826     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 827
 828     return true;
 829 }
 830
 831 void wxGCDC::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
 832                               wxCoord *descent, wxCoord *externalLeading ,
 833                               const wxFont *theFont ) const
 834 {
 835     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 836
 837     if ( theFont )
 838     {
 839         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
 840     }
 841
 842     wxDouble h , d , e , w;
 843
 844     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
 845
 846     if ( height )
 847         *height = (wxCoord)h;
 848     if ( descent )
 849         *descent = (wxCoord)d;
 850     if ( externalLeading )
 851         *externalLeading = (wxCoord)e;
 852     if ( width )
 853         *width = (wxCoord)w;
 854
 855     if ( theFont )
 856     {
 857         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 858     }
 859 }
 860
 861 bool wxGCDC::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 862 {
 863     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
 864     widths.Clear();
 865     widths.Add(0,text.Length());
 866     if ( text.IsEmpty() )
 867         return true;
 868
 869     wxArrayDouble widthsD;
 870
 871     m_graphicContext->GetPartialTextExtents( text, widthsD );
 872     for ( size_t i = 0; i < widths.GetCount(); ++i )
 873         widths[i] = (wxCoord)(widthsD[i] + 0.5);
 874
 875     return true;
 876 }
 877
 878 wxCoord wxGCDC::GetCharWidth(void) const
 879 {
 880     wxCoord width;
 881     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
 882
 883     return width;
 884 }
 885
 886 wxCoord wxGCDC::GetCharHeight(void) const
 887 {
 888     wxCoord height;
 889     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
 890
 891     return height;
 892 }
 893
 894 void wxGCDC::Clear(void)
 895 {
 896     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::Clear - invalid DC") );
 897     // TODO better implementation / incorporate size info into wxGCDC or context
 898     m_graphicContext->SetBrush( m_backgroundBrush );
 899     wxPen p = *wxTRANSPARENT_PEN;
 900     m_graphicContext->SetPen( p );
 901     DoDrawRectangle( 0, 0, 32000 , 32000 );
 902     m_graphicContext->SetPen( m_pen );
 903     m_graphicContext->SetBrush( m_brush );
 904 }
 905
 906 void wxGCDC::DoGetSize(int *width, int *height) const
 907 {
 908     *width = 1000;
 909     *height = 1000;
 910 }
 911
 912 void wxGCDC::DoGradientFillLinear(const wxRect& rect,
 913                                   const wxColour& initialColour,
 914                                   const wxColour& destColour,
 915                                   wxDirection nDirection )
 916 {
 917     wxPoint start;
 918     wxPoint end;
 919     switch( nDirection)
 920     {
 921     case wxWEST :
 922         start = rect.GetRightBottom();
 923         start.x++;
 924         end = rect.GetLeftBottom();
 925         break;
 926     case wxEAST :
 927         start = rect.GetLeftBottom();
 928         end = rect.GetRightBottom();
 929         end.x++;
 930         break;
 931     case wxNORTH :
 932         start = rect.GetLeftBottom();
 933         start.y++;
 934         end = rect.GetLeftTop();
 935         break;
 936     case wxSOUTH :
 937         start = rect.GetLeftTop();
 938         end = rect.GetLeftBottom();
 939         end.y++;
 940         break;
 941     default :
 942         break;
 943     }
 944
 945     if (rect.width == 0 || rect.height == 0)
 946         return;
 947
 948     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
 949         start.x,start.y,end.x,end.y, initialColour, destColour));
 950     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 951     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 952     m_graphicContext->SetPen(m_pen);
 953 }
 954
 955 void wxGCDC::DoGradientFillConcentric(const wxRect& rect,
 956                                       const wxColour& initialColour,
 957                                       const wxColour& destColour,
 958                                       const wxPoint& circleCenter)
 959 {
 960     //Radius
 961     wxInt32 cx = rect.GetWidth() / 2;
 962     wxInt32 cy = rect.GetHeight() / 2;
 963     wxInt32 nRadius;
 964     if (cx < cy)
 965         nRadius = cx;
 966     else
 967         nRadius = cy;
 968
 969     // make sure the background is filled (todo move into specific platform implementation ?)
 970     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 971     m_graphicContext->SetBrush( wxBrush( destColour) );
 972     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 973
 974     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
 975         rect.x+circleCenter.x,rect.y+circleCenter.y,
 976         rect.x+circleCenter.x,rect.y+circleCenter.y,
 977         nRadius,initialColour,destColour));
 978
 979     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 980     m_graphicContext->SetPen(m_pen);
 981 }
 982
 983 void wxGCDC::DoDrawCheckMark(wxCoord x, wxCoord y,
 984                              wxCoord width, wxCoord height)
 985 {
 986     wxDCBase::DoDrawCheckMark(x,y,width,height);
 987 }
 988
 989 #endif // wxUSE_GRAPHICS_CONTEXT