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     m_graphicContext->SetPen( m_pen );
 204     m_graphicContext->SetBrush( m_brush );
 205
 206     m_clipping = false;
 207 }
 208
 209 void wxGCDC::DoGetSizeMM( int* width, int* height ) const
 210 {
 211     int w = 0, h = 0;
 212
 213     GetSize( &w, &h );
 214     if (width)
 215         *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
 216     if (height)
 217         *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
 218 }
 219
 220 void wxGCDC::SetTextForeground( const wxColour &col )
 221 {
 222     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 223
 224     if ( col != m_textForegroundColour )
 225     {
 226         m_textForegroundColour = col;
 227         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 228     }
 229 }
 230
 231 void wxGCDC::SetTextBackground( const wxColour &col )
 232 {
 233     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 234
 235     m_textBackgroundColour = col;
 236 }
 237
 238 void wxGCDC::SetMapMode( int mode )
 239 {
 240     switch (mode)
 241     {
 242     case wxMM_TWIPS:
 243         SetLogicalScale( twips2mm * m_mm_to_pix_x, twips2mm * m_mm_to_pix_y );
 244         break;
 245
 246     case wxMM_POINTS:
 247         SetLogicalScale( pt2mm * m_mm_to_pix_x, pt2mm * m_mm_to_pix_y );
 248         break;
 249
 250     case wxMM_METRIC:
 251         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 252         break;
 253
 254     case wxMM_LOMETRIC:
 255         SetLogicalScale( m_mm_to_pix_x / 10.0, m_mm_to_pix_y / 10.0 );
 256         break;
 257
 258     case wxMM_TEXT:
 259     default:
 260         SetLogicalScale( 1.0, 1.0 );
 261         break;
 262     }
 263
 264     ComputeScaleAndOrigin();
 265 }
 266
 267 void wxGCDC::SetUserScale( double x, double y )
 268 {
 269     // allow negative ? -> no
 270
 271     m_userScaleX = x;
 272     m_userScaleY = y;
 273     ComputeScaleAndOrigin();
 274 }
 275
 276 void wxGCDC::SetLogicalScale( double x, double y )
 277 {
 278     // allow negative ?
 279     m_logicalScaleX = x;
 280     m_logicalScaleY = y;
 281     ComputeScaleAndOrigin();
 282 }
 283
 284 void wxGCDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 285 {
 286     m_logicalOriginX = x * m_signX;   // is this still correct ?
 287     m_logicalOriginY = y * m_signY;
 288     ComputeScaleAndOrigin();
 289 }
 290
 291 void wxGCDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 292 {
 293     m_deviceOriginX = x;
 294     m_deviceOriginY = y;
 295     ComputeScaleAndOrigin();
 296 }
 297
 298 void wxGCDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 299 {
 300     m_signX = (xLeftRight ?  1 : -1);
 301     m_signY = (yBottomUp ? -1 :  1);
 302     ComputeScaleAndOrigin();
 303 }
 304
 305 wxSize wxGCDC::GetPPI() const
 306 {
 307     return wxSize(72, 72);
 308 }
 309
 310 int wxGCDC::GetDepth() const
 311 {
 312     return 32;
 313 }
 314
 315 void wxGCDC::ComputeScaleAndOrigin()
 316 {
 317     m_scaleX = m_logicalScaleX * m_userScaleX;
 318     m_scaleY = m_logicalScaleY * m_userScaleY;
 319
 320     if ( m_graphicContext )
 321     {
 322         m_matrixCurrent = m_graphicContext->CreateMatrix();
 323         m_matrixCurrent.Translate( m_deviceOriginX, m_deviceOriginY );
 324         m_matrixCurrent.Scale( m_scaleX, m_scaleY );
 325         // the logical origin sets the origin to have new coordinates
 326         m_matrixCurrent.Translate( -m_logicalOriginX, -m_logicalOriginY );
 327
 328         m_graphicContext->SetTransform( m_matrixOriginal );
 329         m_graphicContext->ConcatTransform( m_matrixCurrent );
 330     }
 331 }
 332
 333 void wxGCDC::SetPalette( const wxPalette& WXUNUSED(palette) )
 334 {
 335
 336 }
 337
 338 void wxGCDC::SetBackgroundMode( int mode )
 339 {
 340     m_backgroundMode = mode;
 341 }
 342
 343 void wxGCDC::SetFont( const wxFont &font )
 344 {
 345     m_font = font;
 346     if ( m_graphicContext )
 347     {
 348         wxFont f = font;
 349         if ( f.Ok() )
 350             f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
 351         m_graphicContext->SetFont( f, m_textForegroundColour );
 352     }
 353 }
 354
 355 void wxGCDC::SetPen( const wxPen &pen )
 356 {
 357     if ( m_pen == pen )
 358         return;
 359
 360     m_pen = pen;
 361     if ( m_graphicContext )
 362     {
 363         m_graphicContext->SetPen( m_pen );
 364     }
 365 }
 366
 367 void wxGCDC::SetBrush( const wxBrush &brush )
 368 {
 369     if (m_brush == brush)
 370         return;
 371
 372     m_brush = brush;
 373     if ( m_graphicContext )
 374     {
 375         m_graphicContext->SetBrush( m_brush );
 376     }
 377 }
 378
 379 void wxGCDC::SetBackground( const wxBrush &brush )
 380 {
 381     if (m_backgroundBrush == brush)
 382         return;
 383
 384     m_backgroundBrush = brush;
 385     if (!m_backgroundBrush.Ok())
 386         return;
 387 }
 388
 389 void wxGCDC::SetLogicalFunction( int function )
 390 {
 391     if (m_logicalFunction == function)
 392         return;
 393
 394     m_logicalFunction = function;
 395     if ( m_graphicContext->SetLogicalFunction( function ) )
 396         m_logicalFunctionSupported=true;
 397     else
 398         m_logicalFunctionSupported=false;
 399 }
 400
 401 bool wxGCDC::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 402                          const wxColour& WXUNUSED(col), int WXUNUSED(style))
 403 {
 404     return false;
 405 }
 406
 407 bool wxGCDC::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 408 {
 409     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 410     return false;
 411 }
 412
 413 void wxGCDC::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 414 {
 415     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 416
 417     if ( !m_logicalFunctionSupported )
 418         return;
 419
 420     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 421
 422     CalcBoundingBox(x1, y1);
 423     CalcBoundingBox(x2, y2);
 424 }
 425
 426 void wxGCDC::DoCrossHair( wxCoord x, wxCoord y )
 427 {
 428     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 429
 430     if ( !m_logicalFunctionSupported )
 431         return;
 432
 433     int w = 0, h = 0;
 434
 435     GetSize( &w, &h );
 436
 437     m_graphicContext->StrokeLine(0,y,w,y);
 438     m_graphicContext->StrokeLine(x,0,x,h);
 439
 440     CalcBoundingBox(0, 0);
 441     CalcBoundingBox(0+w, 0+h);
 442 }
 443
 444 void wxGCDC::DoDrawArc( wxCoord x1, wxCoord y1,
 445                         wxCoord x2, wxCoord y2,
 446                         wxCoord xc, wxCoord yc )
 447 {
 448     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 449
 450     if ( !m_logicalFunctionSupported )
 451         return;
 452
 453     double dx = x1 - xc;
 454     double dy = y1 - yc;
 455     double radius = sqrt((double)(dx * dx + dy * dy));
 456     wxCoord rad = (wxCoord)radius;
 457     double sa, ea;
 458     if (x1 == x2 && y1 == y2)
 459     {
 460         sa = 0.0;
 461         ea = 360.0;
 462     }
 463     else if (radius == 0.0)
 464     {
 465         sa = ea = 0.0;
 466     }
 467     else
 468     {
 469         sa = (x1 - xc == 0) ?
 470      (y1 - yc < 0) ? 90.0 : -90.0 :
 471              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 472         ea = (x2 - xc == 0) ?
 473      (y2 - yc < 0) ? 90.0 : -90.0 :
 474              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 475     }
 476
 477     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 478
 479     wxGraphicsPath path = m_graphicContext->CreatePath();
 480     if ( fill && ((x1!=x2)||(y1!=y2)) )
 481         path.MoveToPoint( xc, yc );
 482     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 483     // get clockwise angles
 484     path.AddArc( xc, yc , rad , DegToRad(-sa) , DegToRad(-ea), false );
 485     if ( fill && ((x1!=x2)||(y1!=y2)) )
 486         path.AddLineToPoint( xc, yc );
 487     m_graphicContext->DrawPath(path);
 488 }
 489
 490 void wxGCDC::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 491                                 double sa, double ea )
 492 {
 493     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 494
 495     if ( !m_logicalFunctionSupported )
 496         return;
 497
 498     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 499
 500     wxGraphicsPath path = m_graphicContext->CreatePath();
 501     m_graphicContext->PushState();
 502     m_graphicContext->Translate(x+w/2,y+h/2);
 503     wxDouble factor = ((wxDouble) w) / h;
 504     m_graphicContext->Scale( factor , 1.0);
 505     if ( fill && (sa!=ea) )
 506         path.MoveToPoint(0,0);
 507     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 508     // get clockwise angles
 509     path.AddArc( 0, 0, h/2 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 510     if ( fill && (sa!=ea) )
 511         path.AddLineToPoint(0,0);
 512     m_graphicContext->DrawPath( path );
 513     m_graphicContext->PopState();
 514 }
 515
 516 void wxGCDC::DoDrawPoint( wxCoord x, wxCoord y )
 517 {
 518     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 519
 520     DoDrawLine( x , y , x + 1 , y + 1 );
 521 }
 522
 523 void wxGCDC::DoDrawLines(int n, wxPoint points[],
 524                          wxCoord xoffset, wxCoord yoffset)
 525 {
 526     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 527
 528     if ( !m_logicalFunctionSupported )
 529         return;
 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_logicalFunctionSupported )
 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_logicalFunctionSupported )
 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_logicalFunctionSupported )
 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_logicalFunctionSupported )
 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_logicalFunctionSupported )
 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_logicalFunctionSupported )
 761         return;
 762
 763     if ( m_backgroundMode == wxTRANSPARENT )
 764         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 765     else
 766         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ), m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 767 }
 768
 769 void wxGCDC::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 770 {
 771     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 772
 773     if ( str.length() == 0 )
 774         return;
 775
 776     if ( !m_logicalFunctionSupported )
 777         return;
 778
 779     if ( m_backgroundMode == wxTRANSPARENT )
 780         m_graphicContext->DrawText( str, x ,y);
 781     else
 782         m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 783 }
 784
 785 bool wxGCDC::CanGetTextExtent() const
 786 {
 787     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 788
 789     return true;
 790 }
 791
 792 void wxGCDC::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
 793                               wxCoord *descent, wxCoord *externalLeading ,
 794                               wxFont *theFont ) const
 795 {
 796     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 797
 798     if ( theFont )
 799     {
 800         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
 801     }
 802
 803     wxDouble h , d , e , w;
 804
 805     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
 806
 807     if ( height )
 808         *height = (wxCoord)h;
 809     if ( descent )
 810         *descent = (wxCoord)d;
 811     if ( externalLeading )
 812         *externalLeading = (wxCoord)e;
 813     if ( width )
 814         *width = (wxCoord)w;
 815
 816     if ( theFont )
 817     {
 818         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 819     }
 820 }
 821
 822 bool wxGCDC::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 823 {
 824     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
 825     widths.Clear();
 826     widths.Add(0,text.Length());
 827     if ( text.IsEmpty() )
 828         return true;
 829
 830     wxArrayDouble widthsD;
 831
 832     m_graphicContext->GetPartialTextExtents( text, widthsD );
 833     for ( size_t i = 0; i < widths.GetCount(); ++i )
 834         widths[i] = (wxCoord)(widthsD[i] + 0.5);
 835
 836     return true;
 837 }
 838
 839 wxCoord wxGCDC::GetCharWidth(void) const
 840 {
 841     wxCoord width;
 842     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
 843
 844     return width;
 845 }
 846
 847 wxCoord wxGCDC::GetCharHeight(void) const
 848 {
 849     wxCoord height;
 850     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
 851
 852     return height;
 853 }
 854
 855 void wxGCDC::Clear(void)
 856 {
 857     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::Clear - invalid DC") );
 858     // TODO better implementation / incorporate size info into wxGCDC or context
 859     m_graphicContext->SetBrush( m_backgroundBrush );
 860     wxPen p = *wxTRANSPARENT_PEN;
 861     m_graphicContext->SetPen( p );
 862     DoDrawRectangle( 0, 0, 32000 , 32000 );
 863     m_graphicContext->SetPen( m_pen );
 864     m_graphicContext->SetBrush( m_brush );
 865 }
 866
 867 void wxGCDC::DoGetSize(int *width, int *height) const
 868 {
 869     *width = 1000;
 870     *height = 1000;
 871 }
 872
 873 void wxGCDC::DoGradientFillLinear(const wxRect& rect,
 874                                   const wxColour& initialColour,
 875                                   const wxColour& destColour,
 876                                   wxDirection nDirection )
 877 {
 878     wxPoint start;
 879     wxPoint end;
 880     switch( nDirection)
 881     {
 882     case wxWEST :
 883         start = rect.GetRightBottom();
 884         start.x++;
 885         end = rect.GetLeftBottom();
 886         break;
 887     case wxEAST :
 888         start = rect.GetLeftBottom();
 889         end = rect.GetRightBottom();
 890         end.x++;
 891         break;
 892     case wxNORTH :
 893         start = rect.GetLeftBottom();
 894         start.y++;
 895         end = rect.GetLeftTop();
 896         break;
 897     case wxSOUTH :
 898         start = rect.GetLeftTop();
 899         end = rect.GetLeftBottom();
 900         end.y++;
 901         break;
 902     default :
 903         break;
 904     }
 905
 906     if (rect.width == 0 || rect.height == 0)
 907         return;
 908
 909     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
 910         start.x,start.y,end.x,end.y, initialColour, destColour));
 911     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 912     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 913     m_graphicContext->SetPen(m_pen);
 914 }
 915
 916 void wxGCDC::DoGradientFillConcentric(const wxRect& rect,
 917                                       const wxColour& initialColour,
 918                                       const wxColour& destColour,
 919                                       const wxPoint& circleCenter)
 920 {
 921     //Radius
 922     wxInt32 cx = rect.GetWidth() / 2;
 923     wxInt32 cy = rect.GetHeight() / 2;
 924     wxInt32 nRadius;
 925     if (cx < cy)
 926         nRadius = cx;
 927     else
 928         nRadius = cy;
 929
 930     // make sure the background is filled (todo move into specific platform implementation ?)
 931     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 932     m_graphicContext->SetBrush( wxBrush( destColour) );
 933     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 934
 935     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
 936         rect.x+circleCenter.x,rect.y+circleCenter.y,
 937         rect.x+circleCenter.x,rect.y+circleCenter.y,
 938         nRadius,initialColour,destColour));
 939
 940     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 941     m_graphicContext->SetPen(m_pen);
 942 }
 943
 944 void wxGCDC::DoDrawCheckMark(wxCoord x, wxCoord y,
 945                              wxCoord width, wxCoord height)
 946 {
 947     wxDCBase::DoDrawCheckMark(x,y,width,height);
 948 }
 949
 950 #endif // wxUSE_GRAPHICS_CONTEXT