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 #include "wx/dcgraph.h"
  23
  24 #ifndef WX_PRECOMP
  25     #include "wx/icon.h"
  26     #include "wx/bitmap.h"
  27     #include "wx/dcmemory.h"
  28     #include "wx/region.h"
  29 #endif
  30
  31 #ifdef __WXMAC__
  32 #include "wx/mac/private.h"
  33 #endif
  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 IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDC)
  54
  55 wxGCDC::wxGCDC(const wxWindowDC& dc) :
  56   wxDC( new wxGCDCImpl( this, dc ) )
  57 {
  58 }
  59
  60 wxGCDC::wxGCDC( const wxMemoryDC& dc) :
  61   wxDC( new wxGCDCImpl( this, dc ) )
  62 {
  63 }
  64
  65 wxGCDC::wxGCDC() :
  66   wxDC( new wxGCDCImpl( this ) )
  67 {
  68 }
  69
  70 wxGCDC::~wxGCDC()
  71 {
  72 }
  73
  74 wxGraphicsContext* wxGCDC::GetGraphicsContext()
  75 {
  76     if (!m_pimpl) return NULL;
  77     wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
  78     return gc_impl->GetGraphicsContext();
  79 }
  80
  81 void wxGCDC::SetGraphicsContext( wxGraphicsContext* ctx )
  82 {
  83     if (!m_pimpl) return;
  84     wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
  85     gc_impl->SetGraphicsContext( ctx );
  86 }
  87
  88 IMPLEMENT_ABSTRACT_CLASS(wxGCDCImpl, wxDCImpl)
  89
  90 wxGCDCImpl::wxGCDCImpl( wxDC *owner ) :
  91    wxDCImpl( owner )
  92 {
  93     Init();
  94 }
  95
  96 void wxGCDCImpl::SetGraphicsContext( wxGraphicsContext* ctx )
  97 {
  98     delete m_graphicContext;
  99     m_graphicContext = ctx;
 100     if ( m_graphicContext )
 101     {
 102         m_matrixOriginal = m_graphicContext->GetTransform();
 103         m_ok = true;
 104         // apply the stored transformations to the passed in context
 105         ComputeScaleAndOrigin();
 106         m_graphicContext->SetFont( m_font , m_textForegroundColour );
 107         m_graphicContext->SetPen( m_pen );
 108         m_graphicContext->SetBrush( m_brush);
 109     }
 110 }
 111
 112 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxWindowDC& dc ) :
 113    wxDCImpl( owner )
 114 {
 115     Init();
 116     SetGraphicsContext( wxGraphicsContext::Create(dc) );
 117     m_window = dc.GetWindow();
 118 }
 119
 120 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxMemoryDC& dc ) :
 121    wxDCImpl( owner )
 122 {
 123     Init();
 124     SetGraphicsContext( wxGraphicsContext::Create(dc) );
 125 }
 126
 127 void wxGCDCImpl::Init()
 128 {
 129     m_ok = false;
 130     m_colour = true;
 131     m_mm_to_pix_x = mm2pt;
 132     m_mm_to_pix_y = mm2pt;
 133
 134     m_pen = *wxBLACK_PEN;
 135     m_font = *wxNORMAL_FONT;
 136     m_brush = *wxWHITE_BRUSH;
 137
 138     m_graphicContext = NULL;
 139     m_logicalFunctionSupported = true;
 140 }
 141
 142
 143 wxGCDCImpl::~wxGCDCImpl()
 144 {
 145     delete m_graphicContext;
 146 }
 147
 148 void wxGCDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool WXUNUSED(useMask) )
 149 {
 150     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
 151     wxCHECK_RET( bmp.IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
 152
 153     if ( bmp.GetDepth() == 1 )
 154     {
 155         m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 156         m_graphicContext->SetBrush( wxBrush( m_textBackgroundColour , wxSOLID ) );
 157         m_graphicContext->DrawRectangle( x , y , bmp.GetWidth() , bmp.GetHeight() );
 158         m_graphicContext->SetBrush( wxBrush( m_textForegroundColour , wxSOLID ) );
 159         m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
 160         m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
 161         m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
 162     }
 163     else
 164         m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
 165 }
 166
 167 void wxGCDCImpl::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
 168 {
 169     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
 170     wxCHECK_RET( icon.IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
 171
 172     wxCoord w = icon.GetWidth();
 173     wxCoord h = icon.GetHeight();
 174
 175     m_graphicContext->DrawIcon( icon , x, y, w, h );
 176 }
 177
 178 bool wxGCDCImpl::StartDoc( const wxString& WXUNUSED(message) )
 179 {
 180     return true;
 181 }
 182
 183 void wxGCDCImpl::EndDoc()
 184 {
 185 }
 186
 187 void wxGCDCImpl::StartPage()
 188 {
 189 }
 190
 191 void wxGCDCImpl::EndPage()
 192 {
 193 }
 194
 195 void wxGCDCImpl::Flush()
 196 {
 197 #ifdef __WXMAC__
 198     CGContextFlush( (CGContextRef) m_graphicContext->GetNativeContext() );
 199 #endif
 200 }
 201
 202 void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
 203 {
 204     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
 205
 206     m_graphicContext->Clip( x, y, w, h );
 207     if ( m_clipping )
 208     {
 209         m_clipX1 = wxMax( m_clipX1, x );
 210         m_clipY1 = wxMax( m_clipY1, y );
 211         m_clipX2 = wxMin( m_clipX2, (x + w) );
 212         m_clipY2 = wxMin( m_clipY2, (y + h) );
 213     }
 214     else
 215     {
 216         m_clipping = true;
 217
 218         m_clipX1 = x;
 219         m_clipY1 = y;
 220         m_clipX2 = x + w;
 221         m_clipY2 = y + h;
 222     }
 223 }
 224
 225 void wxGCDCImpl::DoSetClippingRegionAsRegion( const wxRegion &region )
 226 {
 227     // region is in device coordinates
 228     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegionAsRegion - invalid DC") );
 229
 230     if (region.Empty())
 231     {
 232         //DestroyClippingRegion();
 233         return;
 234     }
 235
 236     wxRegion logRegion( region );
 237     wxCoord x, y, w, h;
 238
 239     logRegion.Offset( DeviceToLogicalX(0), DeviceToLogicalY(0) );
 240     logRegion.GetBox( x, y, w, h );
 241
 242     m_graphicContext->Clip( logRegion );
 243     if ( m_clipping )
 244     {
 245         m_clipX1 = wxMax( m_clipX1, x );
 246         m_clipY1 = wxMax( m_clipY1, y );
 247         m_clipX2 = wxMin( m_clipX2, (x + w) );
 248         m_clipY2 = wxMin( m_clipY2, (y + h) );
 249     }
 250     else
 251     {
 252         m_clipping = true;
 253
 254         m_clipX1 = x;
 255         m_clipY1 = y;
 256         m_clipX2 = x + w;
 257         m_clipY2 = y + h;
 258     }
 259 }
 260
 261 void wxGCDCImpl::DestroyClippingRegion()
 262 {
 263     m_graphicContext->ResetClip();
 264     // currently the clip eg of a window extends to the area between the scrollbars
 265     // so we must explicitely make sure it only covers the area we want it to draw
 266     int width, height ;
 267     GetOwner()->GetSize( &width , &height ) ;
 268     m_graphicContext->Clip( DeviceToLogicalX(0) , DeviceToLogicalY(0) , DeviceToLogicalXRel(width), DeviceToLogicalYRel(height) );
 269
 270     m_graphicContext->SetPen( m_pen );
 271     m_graphicContext->SetBrush( m_brush );
 272
 273     m_clipping = false;
 274 }
 275
 276 void wxGCDCImpl::DoGetSizeMM( int* width, int* height ) const
 277 {
 278     int w = 0, h = 0;
 279
 280     GetOwner()->GetSize( &w, &h );
 281     if (width)
 282         *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
 283     if (height)
 284         *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
 285 }
 286
 287 void wxGCDCImpl::SetTextForeground( const wxColour &col )
 288 {
 289     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 290
 291     if ( col != m_textForegroundColour )
 292     {
 293         m_textForegroundColour = col;
 294         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 295     }
 296 }
 297
 298 void wxGCDCImpl::SetTextBackground( const wxColour &col )
 299 {
 300     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 301
 302     m_textBackgroundColour = col;
 303 }
 304
 305 void wxGCDCImpl::SetMapMode( int mode )
 306 {
 307     switch (mode)
 308     {
 309     case wxMM_TWIPS:
 310         SetLogicalScale( twips2mm * m_mm_to_pix_x, twips2mm * m_mm_to_pix_y );
 311         break;
 312
 313     case wxMM_POINTS:
 314         SetLogicalScale( pt2mm * m_mm_to_pix_x, pt2mm * m_mm_to_pix_y );
 315         break;
 316
 317     case wxMM_METRIC:
 318         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 319         break;
 320
 321     case wxMM_LOMETRIC:
 322         SetLogicalScale( m_mm_to_pix_x / 10.0, m_mm_to_pix_y / 10.0 );
 323         break;
 324
 325     case wxMM_TEXT:
 326     default:
 327         SetLogicalScale( 1.0, 1.0 );
 328         break;
 329     }
 330
 331     ComputeScaleAndOrigin();
 332 }
 333
 334 wxSize wxGCDCImpl::GetPPI() const
 335 {
 336     return wxSize(72, 72);
 337 }
 338
 339 int wxGCDCImpl::GetDepth() const
 340 {
 341     return 32;
 342 }
 343
 344 void wxGCDCImpl::ComputeScaleAndOrigin()
 345 {
 346     wxDCImpl::ComputeScaleAndOrigin();
 347
 348     if ( m_graphicContext )
 349     {
 350         m_matrixCurrent = m_graphicContext->CreateMatrix();
 351         m_matrixCurrent.Translate( m_deviceOriginX, m_deviceOriginY );
 352         m_matrixCurrent.Scale( m_scaleX, m_scaleY );
 353         // the logical origin sets the origin to have new coordinates
 354         m_matrixCurrent.Translate( -m_logicalOriginX, -m_logicalOriginY );
 355
 356         m_graphicContext->SetTransform( m_matrixOriginal );
 357         m_graphicContext->ConcatTransform( m_matrixCurrent );
 358     }
 359 }
 360
 361 void wxGCDCImpl::SetPalette( const wxPalette& WXUNUSED(palette) )
 362 {
 363
 364 }
 365
 366 void wxGCDCImpl::SetBackgroundMode( int mode )
 367 {
 368     m_backgroundMode = mode;
 369 }
 370
 371 void wxGCDCImpl::SetFont( const wxFont &font )
 372 {
 373     m_font = font;
 374     if ( m_graphicContext )
 375     {
 376         wxFont f = font;
 377         if ( f.IsOk() )
 378             f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
 379         m_graphicContext->SetFont( f, m_textForegroundColour );
 380     }
 381 }
 382
 383 void wxGCDCImpl::SetPen( const wxPen &pen )
 384 {
 385     if ( m_pen == pen )
 386         return;
 387
 388     m_pen = pen;
 389     if ( m_graphicContext )
 390     {
 391         m_graphicContext->SetPen( m_pen );
 392     }
 393 }
 394
 395 void wxGCDCImpl::SetBrush( const wxBrush &brush )
 396 {
 397     if (m_brush == brush)
 398         return;
 399
 400     m_brush = brush;
 401     if ( m_graphicContext )
 402     {
 403         m_graphicContext->SetBrush( m_brush );
 404     }
 405 }
 406
 407 void wxGCDCImpl::SetBackground( const wxBrush &brush )
 408 {
 409     if (m_backgroundBrush == brush)
 410         return;
 411
 412     m_backgroundBrush = brush;
 413     if (!m_backgroundBrush.IsOk())
 414         return;
 415 }
 416
 417 void wxGCDCImpl::SetLogicalFunction( int function )
 418 {
 419     if (m_logicalFunction == function)
 420         return;
 421
 422     m_logicalFunction = function;
 423     if ( m_graphicContext->SetLogicalFunction( function ) )
 424         m_logicalFunctionSupported=true;
 425     else
 426         m_logicalFunctionSupported=false;
 427 }
 428
 429 bool wxGCDCImpl::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 430                          const wxColour& WXUNUSED(col), int WXUNUSED(style))
 431 {
 432     return false;
 433 }
 434
 435 bool wxGCDCImpl::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 436 {
 437     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 438     return false;
 439 }
 440
 441 void wxGCDCImpl::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 442 {
 443     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 444
 445     if ( !m_logicalFunctionSupported )
 446         return;
 447
 448     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 449
 450     CalcBoundingBox(x1, y1);
 451     CalcBoundingBox(x2, y2);
 452 }
 453
 454 void wxGCDCImpl::DoCrossHair( wxCoord x, wxCoord y )
 455 {
 456     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 457
 458     if ( !m_logicalFunctionSupported )
 459         return;
 460
 461     int w = 0, h = 0;
 462
 463     GetOwner()->GetSize( &w, &h );
 464
 465     m_graphicContext->StrokeLine(0,y,w,y);
 466     m_graphicContext->StrokeLine(x,0,x,h);
 467
 468     CalcBoundingBox(0, 0);
 469     CalcBoundingBox(0+w, 0+h);
 470 }
 471
 472 void wxGCDCImpl::DoDrawArc( wxCoord x1, wxCoord y1,
 473                         wxCoord x2, wxCoord y2,
 474                         wxCoord xc, wxCoord yc )
 475 {
 476     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 477
 478     if ( !m_logicalFunctionSupported )
 479         return;
 480
 481     double dx = x1 - xc;
 482     double dy = y1 - yc;
 483     double radius = sqrt((double)(dx * dx + dy * dy));
 484     wxCoord rad = (wxCoord)radius;
 485     double sa, ea;
 486     if (x1 == x2 && y1 == y2)
 487     {
 488         sa = 0.0;
 489         ea = 360.0;
 490     }
 491     else if (radius == 0.0)
 492     {
 493         sa = ea = 0.0;
 494     }
 495     else
 496     {
 497         sa = (x1 - xc == 0) ?
 498      (y1 - yc < 0) ? 90.0 : -90.0 :
 499              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 500         ea = (x2 - xc == 0) ?
 501      (y2 - yc < 0) ? 90.0 : -90.0 :
 502              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 503     }
 504
 505     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 506
 507     wxGraphicsPath path = m_graphicContext->CreatePath();
 508     if ( fill && ((x1!=x2)||(y1!=y2)) )
 509         path.MoveToPoint( xc, yc );
 510     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 511     // get clockwise angles
 512     path.AddArc( xc, yc , rad , DegToRad(-sa) , DegToRad(-ea), false );
 513     if ( fill && ((x1!=x2)||(y1!=y2)) )
 514         path.AddLineToPoint( xc, yc );
 515     m_graphicContext->DrawPath(path);
 516 }
 517
 518 void wxGCDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 519                                 double sa, double ea )
 520 {
 521     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 522
 523     if ( !m_logicalFunctionSupported )
 524         return;
 525
 526     m_graphicContext->PushState();
 527     m_graphicContext->Translate(x+w/2.0,y+h/2.0);
 528     wxDouble factor = ((wxDouble) w) / h;
 529     m_graphicContext->Scale( factor , 1.0);
 530
 531     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 532     // get clockwise angles
 533     if ( m_brush.GetStyle() != wxTRANSPARENT )
 534     {
 535         wxGraphicsPath path = m_graphicContext->CreatePath();
 536         path.MoveToPoint( 0, 0 );
 537         path.AddLineToPoint( h / 2.0 * cos(DegToRad(sa)) , h / 2.0 * sin(DegToRad(-sa)) );
 538         path.AddLineToPoint( h / 2.0 * cos(DegToRad(ea)) , h / 2.0 * sin(DegToRad(-ea)) );
 539         path.AddLineToPoint( 0, 0 );
 540         m_graphicContext->FillPath( path );
 541
 542         path = m_graphicContext->CreatePath();
 543         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 544         m_graphicContext->FillPath( path );
 545         m_graphicContext->StrokePath( path );
 546     }
 547     else
 548     {
 549         wxGraphicsPath path = m_graphicContext->CreatePath();
 550     path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 551     m_graphicContext->DrawPath( path );
 552     }
 553
 554     m_graphicContext->PopState();
 555 }
 556
 557 void wxGCDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
 558 {
 559     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 560
 561     DoDrawLine( x , y , x + 1 , y + 1 );
 562 }
 563
 564 void wxGCDCImpl::DoDrawLines(int n, wxPoint points[],
 565                          wxCoord xoffset, wxCoord yoffset)
 566 {
 567     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 568
 569     if ( !m_logicalFunctionSupported )
 570         return;
 571
 572     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 573     for( int i = 0; i < n; ++i)
 574     {
 575         pointsD[i].m_x = points[i].x + xoffset;
 576         pointsD[i].m_y = points[i].y + yoffset;
 577     }
 578
 579     m_graphicContext->StrokeLines( n , pointsD);
 580     delete[] pointsD;
 581 }
 582
 583 #if wxUSE_SPLINES
 584 void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
 585 {
 586     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 587
 588     if ( !m_logicalFunctionSupported )
 589         return;
 590
 591     wxGraphicsPath path = m_graphicContext->CreatePath();
 592
 593     wxPointList::compatibility_iterator node = points->GetFirst();
 594     if (node == wxPointList::compatibility_iterator())
 595         // empty list
 596         return;
 597
 598     wxPoint *p = node->GetData();
 599
 600     wxCoord x1 = p->x;
 601     wxCoord y1 = p->y;
 602
 603     node = node->GetNext();
 604     p = node->GetData();
 605
 606     wxCoord x2 = p->x;
 607     wxCoord y2 = p->y;
 608     wxCoord cx1 = ( x1 + x2 ) / 2;
 609     wxCoord cy1 = ( y1 + y2 ) / 2;
 610
 611     path.MoveToPoint( x1 , y1 );
 612     path.AddLineToPoint( cx1 , cy1 );
 613 #if !wxUSE_STL
 614
 615     while ((node = node->GetNext()) != NULL)
 616 #else
 617
 618     while ((node = node->GetNext()))
 619 #endif // !wxUSE_STL
 620
 621     {
 622         p = node->GetData();
 623         x1 = x2;
 624         y1 = y2;
 625         x2 = p->x;
 626         y2 = p->y;
 627         wxCoord cx4 = (x1 + x2) / 2;
 628         wxCoord cy4 = (y1 + y2) / 2;
 629
 630         path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 631
 632         cx1 = cx4;
 633         cy1 = cy4;
 634     }
 635
 636     path.AddLineToPoint( x2 , y2 );
 637
 638     m_graphicContext->StrokePath( path );
 639 }
 640 #endif // wxUSE_SPLINES
 641
 642 void wxGCDCImpl::DoDrawPolygon( int n, wxPoint points[],
 643                             wxCoord xoffset, wxCoord yoffset,
 644                             int fillStyle )
 645 {
 646     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 647
 648     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 649         return;
 650     if ( !m_logicalFunctionSupported )
 651         return;
 652
 653     bool closeIt = false;
 654     if (points[n-1] != points[0])
 655         closeIt = true;
 656
 657     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 658     for( int i = 0; i < n; ++i)
 659     {
 660         pointsD[i].m_x = points[i].x + xoffset;
 661         pointsD[i].m_y = points[i].y + yoffset;
 662     }
 663     if ( closeIt )
 664         pointsD[n] = pointsD[0];
 665
 666     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 667     delete[] pointsD;
 668 }
 669
 670 void wxGCDCImpl::DoDrawPolyPolygon(int n,
 671                                int count[],
 672                                wxPoint points[],
 673                                wxCoord xoffset,
 674                                wxCoord yoffset,
 675                                int fillStyle)
 676 {
 677     wxASSERT(n > 1);
 678     wxGraphicsPath path = m_graphicContext->CreatePath();
 679
 680     int i = 0;
 681     for ( int j = 0; j < n; ++j)
 682     {
 683         wxPoint start = points[i];
 684         path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
 685         ++i;
 686         int l = count[j];
 687         for ( int k = 1; k < l; ++k)
 688         {
 689             path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
 690             ++i;
 691         }
 692         // close the polygon
 693         if ( start != points[i-1])
 694             path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
 695     }
 696     m_graphicContext->DrawPath( path , fillStyle);
 697 }
 698
 699 void wxGCDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 700 {
 701     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 702
 703     if ( !m_logicalFunctionSupported )
 704         return;
 705
 706     // CMB: draw nothing if transformed w or h is 0
 707     if (w == 0 || h == 0)
 708         return;
 709
 710     if ( m_graphicContext->ShouldOffset() )
 711     {
 712         // if we are offsetting the entire rectangle is moved 0.5, so the
 713         // border line gets off by 1
 714         w -= 1;
 715         h -= 1;
 716     }
 717     m_graphicContext->DrawRectangle(x,y,w,h);
 718 }
 719
 720 void wxGCDCImpl::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 721                                     wxCoord w, wxCoord h,
 722                                     double radius)
 723 {
 724     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 725
 726     if ( !m_logicalFunctionSupported )
 727         return;
 728
 729     if (radius < 0.0)
 730         radius = - radius * ((w < h) ? w : h);
 731
 732     // CMB: draw nothing if transformed w or h is 0
 733     if (w == 0 || h == 0)
 734         return;
 735
 736     if ( m_graphicContext->ShouldOffset() )
 737     {
 738         // if we are offsetting the entire rectangle is moved 0.5, so the
 739         // border line gets off by 1
 740         w -= 1;
 741         h -= 1;
 742     }
 743     m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
 744 }
 745
 746 void wxGCDCImpl::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 747 {
 748     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 749
 750     if ( !m_logicalFunctionSupported )
 751         return;
 752
 753     if ( m_graphicContext->ShouldOffset() )
 754     {
 755         // if we are offsetting the entire rectangle is moved 0.5, so the
 756         // border line gets off by 1
 757         w -= 1;
 758         h -= 1;
 759     }
 760     m_graphicContext->DrawEllipse(x,y,w,h);
 761 }
 762
 763 bool wxGCDCImpl::CanDrawBitmap() const
 764 {
 765     return true;
 766 }
 767
 768 bool wxGCDCImpl::DoBlit(
 769     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 770     wxDC *source, wxCoord xsrc, wxCoord ysrc, int logical_func , bool useMask,
 771     wxCoord xsrcMask, wxCoord ysrcMask )
 772 {
 773     return DoStretchBlit( xdest, ydest, width, height,
 774         source, xsrc, ysrc, width, height, logical_func, useMask,
 775         xsrcMask,ysrcMask );
 776 }
 777
 778 bool wxGCDCImpl::DoStretchBlit(
 779     wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
 780     wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
 781     int logical_func , bool WXUNUSED(useMask),
 782     wxCoord xsrcMask, wxCoord ysrcMask )
 783 {
 784     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
 785     wxCHECK_MSG( source->IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid source DC") );
 786
 787     if ( logical_func == wxNO_OP )
 788         return true;
 789     else if ( !m_graphicContext->SetLogicalFunction( logical_func ) )
 790
 791     {
 792         wxFAIL_MSG( wxT("Blitting is only supported with wxCOPY logical operation.") );
 793         return false;
 794     }
 795
 796     if (xsrcMask == -1 && ysrcMask == -1)
 797     {
 798         xsrcMask = xsrc;
 799         ysrcMask = ysrc;
 800     }
 801
 802     wxRect subrect(source->LogicalToDeviceX(xsrc),
 803                    source->LogicalToDeviceY(ysrc),
 804                    source->LogicalToDeviceXRel(srcWidth),
 805                    source->LogicalToDeviceYRel(srcHeight));
 806
 807     // if needed clip the subrect down to the size of the source DC
 808     wxCoord sw, sh;
 809     source->GetSize(&sw, &sh);
 810     sw = source->LogicalToDeviceXRel(sw);
 811     sh = source->LogicalToDeviceYRel(sh);
 812     if (subrect.x + subrect.width > sw)
 813         subrect.width = sw - subrect.x;
 814     if (subrect.y + subrect.height > sh)
 815         subrect.height = sh - subrect.y;
 816
 817     wxBitmap blit = source->GetAsBitmap( &subrect );
 818
 819     if ( blit.IsOk() )
 820     {
 821         m_graphicContext->DrawBitmap( blit, xdest, ydest,
 822                                       dstWidth, dstHeight);
 823     }
 824     else
 825     {
 826         wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
 827         return false;
 828     }
 829
 830     // reset logical function
 831     m_graphicContext->SetLogicalFunction( m_logicalFunction );
 832
 833     return true;
 834 }
 835
 836 void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 837                                double angle)
 838 {
 839     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 840
 841     if ( str.length() == 0 )
 842         return;
 843     if ( !m_logicalFunctionSupported )
 844         return;
 845
 846     if ( m_backgroundMode == wxTRANSPARENT )
 847         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 848     else
 849         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ), m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 850 }
 851
 852 void wxGCDCImpl::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 853 {
 854     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 855
 856     if ( str.length() == 0 )
 857         return;
 858
 859     if ( !m_logicalFunctionSupported )
 860         return;
 861
 862     if ( m_backgroundMode == wxTRANSPARENT )
 863         m_graphicContext->DrawText( str, x ,y);
 864     else
 865         m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 866 }
 867
 868 bool wxGCDCImpl::CanGetTextExtent() const
 869 {
 870     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 871
 872     return true;
 873 }
 874
 875 void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
 876                               wxCoord *descent, wxCoord *externalLeading ,
 877                               const wxFont *theFont ) const
 878 {
 879     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 880
 881     if ( theFont )
 882     {
 883         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
 884     }
 885
 886     wxDouble h , d , e , w;
 887
 888     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
 889
 890     if ( height )
 891         *height = (wxCoord)(h+0.5);
 892     if ( descent )
 893         *descent = (wxCoord)(d+0.5);
 894     if ( externalLeading )
 895         *externalLeading = (wxCoord)(e+0.5);
 896     if ( width )
 897         *width = (wxCoord)(w+0.5);
 898
 899     if ( theFont )
 900     {
 901         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 902     }
 903 }
 904
 905 bool wxGCDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 906 {
 907     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
 908     widths.Clear();
 909     widths.Add(0,text.Length());
 910     if ( text.IsEmpty() )
 911         return true;
 912
 913     wxArrayDouble widthsD;
 914
 915     m_graphicContext->GetPartialTextExtents( text, widthsD );
 916     for ( size_t i = 0; i < widths.GetCount(); ++i )
 917         widths[i] = (wxCoord)(widthsD[i] + 0.5);
 918
 919     return true;
 920 }
 921
 922 wxCoord wxGCDCImpl::GetCharWidth(void) const
 923 {
 924     wxCoord width;
 925     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
 926
 927     return width;
 928 }
 929
 930 wxCoord wxGCDCImpl::GetCharHeight(void) const
 931 {
 932     wxCoord height;
 933     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
 934
 935     return height;
 936 }
 937
 938 void wxGCDCImpl::Clear(void)
 939 {
 940     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::Clear - invalid DC") );
 941     // TODO better implementation / incorporate size info into wxGCDC or context
 942     m_graphicContext->SetBrush( m_backgroundBrush );
 943     wxPen p = *wxTRANSPARENT_PEN;
 944     m_graphicContext->SetPen( p );
 945     DoDrawRectangle( 0, 0, 32000 , 32000 );
 946     m_graphicContext->SetPen( m_pen );
 947     m_graphicContext->SetBrush( m_brush );
 948 }
 949
 950 void wxGCDCImpl::DoGetSize(int *width, int *height) const
 951 {
 952     *width = 10000;
 953     *height = 10000;
 954 }
 955
 956 void wxGCDCImpl::DoGradientFillLinear(const wxRect& rect,
 957                                   const wxColour& initialColour,
 958                                   const wxColour& destColour,
 959                                   wxDirection nDirection )
 960 {
 961     wxPoint start;
 962     wxPoint end;
 963     switch( nDirection)
 964     {
 965     case wxWEST :
 966         start = rect.GetRightBottom();
 967         start.x++;
 968         end = rect.GetLeftBottom();
 969         break;
 970     case wxEAST :
 971         start = rect.GetLeftBottom();
 972         end = rect.GetRightBottom();
 973         end.x++;
 974         break;
 975     case wxNORTH :
 976         start = rect.GetLeftBottom();
 977         start.y++;
 978         end = rect.GetLeftTop();
 979         break;
 980     case wxSOUTH :
 981         start = rect.GetLeftTop();
 982         end = rect.GetLeftBottom();
 983         end.y++;
 984         break;
 985     default :
 986         break;
 987     }
 988
 989     if (rect.width == 0 || rect.height == 0)
 990         return;
 991
 992     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
 993         start.x,start.y,end.x,end.y, initialColour, destColour));
 994     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 995     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 996     m_graphicContext->SetPen(m_pen);
 997 }
 998
 999 void wxGCDCImpl::DoGradientFillConcentric(const wxRect& rect,
1000                                       const wxColour& initialColour,
1001                                       const wxColour& destColour,
1002                                       const wxPoint& circleCenter)
1003 {
1004     //Radius
1005     wxInt32 cx = rect.GetWidth() / 2;
1006     wxInt32 cy = rect.GetHeight() / 2;
1007     wxInt32 nRadius;
1008     if (cx < cy)
1009         nRadius = cx;
1010     else
1011         nRadius = cy;
1012
1013     // make sure the background is filled (todo move into specific platform implementation ?)
1014     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1015     m_graphicContext->SetBrush( wxBrush( destColour) );
1016     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1017
1018     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
1019         rect.x+circleCenter.x,rect.y+circleCenter.y,
1020         rect.x+circleCenter.x,rect.y+circleCenter.y,
1021         nRadius,initialColour,destColour));
1022
1023     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1024     m_graphicContext->SetPen(m_pen);
1025 }
1026
1027 void wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
1028                              wxCoord width, wxCoord height)
1029 {
1030     wxDCImpl::DoDrawCheckMark(x,y,width,height);
1031 }
1032
1033 #endif // wxUSE_GRAPHICS_CONTEXT