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 #include "wx/dcclient.h"
  32
  33 #ifdef __WXOSX__
  34     #include "ApplicationServices/ApplicationServices.h"
  35 #endif
  36
  37 //-----------------------------------------------------------------------------
  38 // constants
  39 //-----------------------------------------------------------------------------
  40
  41 static const double RAD2DEG = 180.0 / M_PI;
  42
  43 //-----------------------------------------------------------------------------
  44 // Local functions
  45 //-----------------------------------------------------------------------------
  46
  47 static inline double DegToRad(double deg)
  48 {
  49     return (deg * M_PI) / 180.0;
  50 }
  51
  52 //-----------------------------------------------------------------------------
  53 // wxDC bridge class
  54 //-----------------------------------------------------------------------------
  55
  56 IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDC)
  57
  58 wxGCDC::wxGCDC(const wxWindowDC& dc) :
  59   wxDC( new wxGCDCImpl( this, dc ) )
  60 {
  61 }
  62
  63 wxGCDC::wxGCDC( const wxMemoryDC& dc) :
  64   wxDC( new wxGCDCImpl( this, dc ) )
  65 {
  66 }
  67
  68 wxGCDC::wxGCDC() :
  69   wxDC( new wxGCDCImpl( this ) )
  70 {
  71 }
  72
  73 wxGCDC::~wxGCDC()
  74 {
  75 }
  76
  77 wxGraphicsContext* wxGCDC::GetGraphicsContext()
  78 {
  79     if (!m_pimpl) return NULL;
  80     wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
  81     return gc_impl->GetGraphicsContext();
  82 }
  83
  84 void wxGCDC::SetGraphicsContext( wxGraphicsContext* ctx )
  85 {
  86     if (!m_pimpl) return;
  87     wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
  88     gc_impl->SetGraphicsContext( ctx );
  89 }
  90
  91 IMPLEMENT_ABSTRACT_CLASS(wxGCDCImpl, wxDCImpl)
  92
  93 wxGCDCImpl::wxGCDCImpl( wxDC *owner ) :
  94    wxDCImpl( owner )
  95 {
  96     Init();
  97 }
  98
  99 void wxGCDCImpl::SetGraphicsContext( wxGraphicsContext* ctx )
 100 {
 101     delete m_graphicContext;
 102     m_graphicContext = ctx;
 103     if ( m_graphicContext )
 104     {
 105         m_matrixOriginal = m_graphicContext->GetTransform();
 106         m_ok = true;
 107         // apply the stored transformations to the passed in context
 108         ComputeScaleAndOrigin();
 109         m_graphicContext->SetFont( m_font , m_textForegroundColour );
 110         m_graphicContext->SetPen( m_pen );
 111         m_graphicContext->SetBrush( m_brush);
 112     }
 113 }
 114
 115 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxWindowDC& dc ) :
 116    wxDCImpl( owner )
 117 {
 118     Init();
 119     SetGraphicsContext( wxGraphicsContext::Create(dc) );
 120     m_window = dc.GetWindow();
 121 }
 122
 123 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxMemoryDC& dc ) :
 124    wxDCImpl( owner )
 125 {
 126     Init();
 127     SetGraphicsContext( wxGraphicsContext::Create(dc) );
 128 }
 129
 130 void wxGCDCImpl::Init()
 131 {
 132     m_ok = false;
 133     m_colour = true;
 134     m_mm_to_pix_x = mm2pt;
 135     m_mm_to_pix_y = mm2pt;
 136
 137     m_pen = *wxBLACK_PEN;
 138     m_font = *wxNORMAL_FONT;
 139     m_brush = *wxWHITE_BRUSH;
 140
 141     m_graphicContext = NULL;
 142     m_logicalFunctionSupported = true;
 143 }
 144
 145
 146 wxGCDCImpl::~wxGCDCImpl()
 147 {
 148     delete m_graphicContext;
 149 }
 150
 151 void wxGCDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool WXUNUSED(useMask) )
 152 {
 153     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
 154     wxCHECK_RET( bmp.IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
 155
 156     if ( bmp.GetDepth() == 1 )
 157     {
 158         m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 159         m_graphicContext->SetBrush( wxBrush( m_textBackgroundColour , wxSOLID ) );
 160         m_graphicContext->DrawRectangle( x , y , bmp.GetWidth() , bmp.GetHeight() );
 161         m_graphicContext->SetBrush( wxBrush( m_textForegroundColour , wxSOLID ) );
 162         m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
 163         m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
 164         m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
 165     }
 166     else
 167         m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
 168 }
 169
 170 void wxGCDCImpl::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
 171 {
 172     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
 173     wxCHECK_RET( icon.IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
 174
 175     wxCoord w = icon.GetWidth();
 176     wxCoord h = icon.GetHeight();
 177
 178     m_graphicContext->DrawIcon( icon , x, y, w, h );
 179 }
 180
 181 bool wxGCDCImpl::StartDoc( const wxString& WXUNUSED(message) )
 182 {
 183     return true;
 184 }
 185
 186 void wxGCDCImpl::EndDoc()
 187 {
 188 }
 189
 190 void wxGCDCImpl::StartPage()
 191 {
 192 }
 193
 194 void wxGCDCImpl::EndPage()
 195 {
 196 }
 197
 198 void wxGCDCImpl::Flush()
 199 {
 200 #ifdef __WXOSX__
 201     CGContextFlush( (CGContextRef) m_graphicContext->GetNativeContext() );
 202 #endif
 203 }
 204
 205 void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
 206 {
 207     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
 208
 209     m_graphicContext->Clip( x, y, w, h );
 210     if ( m_clipping )
 211     {
 212         m_clipX1 = wxMax( m_clipX1, x );
 213         m_clipY1 = wxMax( m_clipY1, y );
 214         m_clipX2 = wxMin( m_clipX2, (x + w) );
 215         m_clipY2 = wxMin( m_clipY2, (y + h) );
 216     }
 217     else
 218     {
 219         m_clipping = true;
 220
 221         m_clipX1 = x;
 222         m_clipY1 = y;
 223         m_clipX2 = x + w;
 224         m_clipY2 = y + h;
 225     }
 226 }
 227
 228 void wxGCDCImpl::DoSetClippingRegionAsRegion( const wxRegion &region )
 229 {
 230     // region is in device coordinates
 231     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegionAsRegion - invalid DC") );
 232
 233     if (region.Empty())
 234     {
 235         //DestroyClippingRegion();
 236         return;
 237     }
 238
 239     wxRegion logRegion( region );
 240     wxCoord x, y, w, h;
 241
 242     logRegion.Offset( DeviceToLogicalX(0), DeviceToLogicalY(0) );
 243     logRegion.GetBox( x, y, w, h );
 244
 245     m_graphicContext->Clip( logRegion );
 246     if ( m_clipping )
 247     {
 248         m_clipX1 = wxMax( m_clipX1, x );
 249         m_clipY1 = wxMax( m_clipY1, y );
 250         m_clipX2 = wxMin( m_clipX2, (x + w) );
 251         m_clipY2 = wxMin( m_clipY2, (y + h) );
 252     }
 253     else
 254     {
 255         m_clipping = true;
 256
 257         m_clipX1 = x;
 258         m_clipY1 = y;
 259         m_clipX2 = x + w;
 260         m_clipY2 = y + h;
 261     }
 262 }
 263
 264 void wxGCDCImpl::DestroyClippingRegion()
 265 {
 266     m_graphicContext->ResetClip();
 267     // currently the clip eg of a window extends to the area between the scrollbars
 268     // so we must explicitely make sure it only covers the area we want it to draw
 269     int width, height ;
 270     GetOwner()->GetSize( &width , &height ) ;
 271     m_graphicContext->Clip( DeviceToLogicalX(0) , DeviceToLogicalY(0) , DeviceToLogicalXRel(width), DeviceToLogicalYRel(height) );
 272
 273     m_graphicContext->SetPen( m_pen );
 274     m_graphicContext->SetBrush( m_brush );
 275
 276     m_clipping = false;
 277 }
 278
 279 void wxGCDCImpl::DoGetSizeMM( int* width, int* height ) const
 280 {
 281     int w = 0, h = 0;
 282
 283     GetOwner()->GetSize( &w, &h );
 284     if (width)
 285         *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
 286     if (height)
 287         *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
 288 }
 289
 290 void wxGCDCImpl::SetTextForeground( const wxColour &col )
 291 {
 292     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 293
 294     if ( col != m_textForegroundColour )
 295     {
 296         m_textForegroundColour = col;
 297         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 298     }
 299 }
 300
 301 void wxGCDCImpl::SetTextBackground( const wxColour &col )
 302 {
 303     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 304
 305     m_textBackgroundColour = col;
 306 }
 307
 308 void wxGCDCImpl::SetMapMode( int mode )
 309 {
 310     switch (mode)
 311     {
 312     case wxMM_TWIPS:
 313         SetLogicalScale( twips2mm * m_mm_to_pix_x, twips2mm * m_mm_to_pix_y );
 314         break;
 315
 316     case wxMM_POINTS:
 317         SetLogicalScale( pt2mm * m_mm_to_pix_x, pt2mm * m_mm_to_pix_y );
 318         break;
 319
 320     case wxMM_METRIC:
 321         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 322         break;
 323
 324     case wxMM_LOMETRIC:
 325         SetLogicalScale( m_mm_to_pix_x / 10.0, m_mm_to_pix_y / 10.0 );
 326         break;
 327
 328     case wxMM_TEXT:
 329     default:
 330         SetLogicalScale( 1.0, 1.0 );
 331         break;
 332     }
 333
 334     ComputeScaleAndOrigin();
 335 }
 336
 337 wxSize wxGCDCImpl::GetPPI() const
 338 {
 339     return wxSize(72, 72);
 340 }
 341
 342 int wxGCDCImpl::GetDepth() const
 343 {
 344     return 32;
 345 }
 346
 347 void wxGCDCImpl::ComputeScaleAndOrigin()
 348 {
 349     wxDCImpl::ComputeScaleAndOrigin();
 350
 351     if ( m_graphicContext )
 352     {
 353         m_matrixCurrent = m_graphicContext->CreateMatrix();
 354         m_matrixCurrent.Translate( m_deviceOriginX, m_deviceOriginY );
 355         m_matrixCurrent.Scale( m_scaleX, m_scaleY );
 356         // the logical origin sets the origin to have new coordinates
 357         m_matrixCurrent.Translate( -m_logicalOriginX, -m_logicalOriginY );
 358
 359         m_graphicContext->SetTransform( m_matrixOriginal );
 360         m_graphicContext->ConcatTransform( m_matrixCurrent );
 361     }
 362 }
 363
 364 void wxGCDCImpl::SetPalette( const wxPalette& WXUNUSED(palette) )
 365 {
 366
 367 }
 368
 369 void wxGCDCImpl::SetBackgroundMode( int mode )
 370 {
 371     m_backgroundMode = mode;
 372 }
 373
 374 void wxGCDCImpl::SetFont( const wxFont &font )
 375 {
 376     m_font = font;
 377     if ( m_graphicContext )
 378     {
 379         wxFont f = font;
 380         if ( f.IsOk() )
 381             f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
 382         m_graphicContext->SetFont( f, m_textForegroundColour );
 383     }
 384 }
 385
 386 void wxGCDCImpl::SetPen( const wxPen &pen )
 387 {
 388     if ( m_pen == pen )
 389         return;
 390
 391     m_pen = pen;
 392     if ( m_graphicContext )
 393     {
 394         m_graphicContext->SetPen( m_pen );
 395     }
 396 }
 397
 398 void wxGCDCImpl::SetBrush( const wxBrush &brush )
 399 {
 400     if (m_brush == brush)
 401         return;
 402
 403     m_brush = brush;
 404     if ( m_graphicContext )
 405     {
 406         m_graphicContext->SetBrush( m_brush );
 407     }
 408 }
 409
 410 void wxGCDCImpl::SetBackground( const wxBrush &brush )
 411 {
 412     if (m_backgroundBrush == brush)
 413         return;
 414
 415     m_backgroundBrush = brush;
 416     if (!m_backgroundBrush.IsOk())
 417         return;
 418 }
 419
 420 void wxGCDCImpl::SetLogicalFunction( int function )
 421 {
 422     if (m_logicalFunction == function)
 423         return;
 424
 425     m_logicalFunction = function;
 426     if ( m_graphicContext->SetLogicalFunction( function ) )
 427         m_logicalFunctionSupported=true;
 428     else
 429         m_logicalFunctionSupported=false;
 430 }
 431
 432 bool wxGCDCImpl::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 433                          const wxColour& WXUNUSED(col), int WXUNUSED(style))
 434 {
 435     return false;
 436 }
 437
 438 bool wxGCDCImpl::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 439 {
 440     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 441     return false;
 442 }
 443
 444 void wxGCDCImpl::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 445 {
 446     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 447
 448     if ( !m_logicalFunctionSupported )
 449         return;
 450
 451     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 452
 453     CalcBoundingBox(x1, y1);
 454     CalcBoundingBox(x2, y2);
 455 }
 456
 457 void wxGCDCImpl::DoCrossHair( wxCoord x, wxCoord y )
 458 {
 459     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 460
 461     if ( !m_logicalFunctionSupported )
 462         return;
 463
 464     int w = 0, h = 0;
 465
 466     GetOwner()->GetSize( &w, &h );
 467
 468     m_graphicContext->StrokeLine(0,y,w,y);
 469     m_graphicContext->StrokeLine(x,0,x,h);
 470
 471     CalcBoundingBox(0, 0);
 472     CalcBoundingBox(0+w, 0+h);
 473 }
 474
 475 void wxGCDCImpl::DoDrawArc( wxCoord x1, wxCoord y1,
 476                         wxCoord x2, wxCoord y2,
 477                         wxCoord xc, wxCoord yc )
 478 {
 479     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 480
 481     if ( !m_logicalFunctionSupported )
 482         return;
 483
 484     double dx = x1 - xc;
 485     double dy = y1 - yc;
 486     double radius = sqrt((double)(dx * dx + dy * dy));
 487     wxCoord rad = (wxCoord)radius;
 488     double sa, ea;
 489     if (x1 == x2 && y1 == y2)
 490     {
 491         sa = 0.0;
 492         ea = 360.0;
 493     }
 494     else if (radius == 0.0)
 495     {
 496         sa = ea = 0.0;
 497     }
 498     else
 499     {
 500         sa = (x1 - xc == 0) ?
 501      (y1 - yc < 0) ? 90.0 : -90.0 :
 502              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 503         ea = (x2 - xc == 0) ?
 504      (y2 - yc < 0) ? 90.0 : -90.0 :
 505              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 506     }
 507
 508     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 509
 510     wxGraphicsPath path = m_graphicContext->CreatePath();
 511     if ( fill && ((x1!=x2)||(y1!=y2)) )
 512         path.MoveToPoint( xc, yc );
 513     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 514     // get clockwise angles
 515     path.AddArc( xc, yc , rad , DegToRad(-sa) , DegToRad(-ea), false );
 516     if ( fill && ((x1!=x2)||(y1!=y2)) )
 517         path.AddLineToPoint( xc, yc );
 518     m_graphicContext->DrawPath(path);
 519 }
 520
 521 void wxGCDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 522                                 double sa, double ea )
 523 {
 524     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 525
 526     if ( !m_logicalFunctionSupported )
 527         return;
 528
 529     m_graphicContext->PushState();
 530     m_graphicContext->Translate(x+w/2.0,y+h/2.0);
 531     wxDouble factor = ((wxDouble) w) / h;
 532     m_graphicContext->Scale( factor , 1.0);
 533
 534     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 535     // get clockwise angles
 536     if ( m_brush.GetStyle() != wxTRANSPARENT )
 537     {
 538         wxGraphicsPath path = m_graphicContext->CreatePath();
 539         path.MoveToPoint( 0, 0 );
 540         path.AddLineToPoint( h / 2.0 * cos(DegToRad(sa)) , h / 2.0 * sin(DegToRad(-sa)) );
 541         path.AddLineToPoint( h / 2.0 * cos(DegToRad(ea)) , h / 2.0 * sin(DegToRad(-ea)) );
 542         path.AddLineToPoint( 0, 0 );
 543         m_graphicContext->FillPath( path );
 544
 545         path = m_graphicContext->CreatePath();
 546         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 547         m_graphicContext->FillPath( path );
 548         m_graphicContext->StrokePath( path );
 549     }
 550     else
 551     {
 552         wxGraphicsPath path = m_graphicContext->CreatePath();
 553     path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 554     m_graphicContext->DrawPath( path );
 555     }
 556
 557     m_graphicContext->PopState();
 558 }
 559
 560 void wxGCDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
 561 {
 562     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 563
 564     DoDrawLine( x , y , x + 1 , y + 1 );
 565 }
 566
 567 void wxGCDCImpl::DoDrawLines(int n, wxPoint points[],
 568                          wxCoord xoffset, wxCoord yoffset)
 569 {
 570     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 571
 572     if ( !m_logicalFunctionSupported )
 573         return;
 574
 575     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 576     for( int i = 0; i < n; ++i)
 577     {
 578         pointsD[i].m_x = points[i].x + xoffset;
 579         pointsD[i].m_y = points[i].y + yoffset;
 580     }
 581
 582     m_graphicContext->StrokeLines( n , pointsD);
 583     delete[] pointsD;
 584 }
 585
 586 #if wxUSE_SPLINES
 587 void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
 588 {
 589     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 590
 591     if ( !m_logicalFunctionSupported )
 592         return;
 593
 594     wxGraphicsPath path = m_graphicContext->CreatePath();
 595
 596     wxPointList::compatibility_iterator node = points->GetFirst();
 597     if (node == wxPointList::compatibility_iterator())
 598         // empty list
 599         return;
 600
 601     wxPoint *p = node->GetData();
 602
 603     wxCoord x1 = p->x;
 604     wxCoord y1 = p->y;
 605
 606     node = node->GetNext();
 607     p = node->GetData();
 608
 609     wxCoord x2 = p->x;
 610     wxCoord y2 = p->y;
 611     wxCoord cx1 = ( x1 + x2 ) / 2;
 612     wxCoord cy1 = ( y1 + y2 ) / 2;
 613
 614     path.MoveToPoint( x1 , y1 );
 615     path.AddLineToPoint( cx1 , cy1 );
 616 #if !wxUSE_STL
 617
 618     while ((node = node->GetNext()) != NULL)
 619 #else
 620
 621     while ((node = node->GetNext()))
 622 #endif // !wxUSE_STL
 623
 624     {
 625         p = node->GetData();
 626         x1 = x2;
 627         y1 = y2;
 628         x2 = p->x;
 629         y2 = p->y;
 630         wxCoord cx4 = (x1 + x2) / 2;
 631         wxCoord cy4 = (y1 + y2) / 2;
 632
 633         path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 634
 635         cx1 = cx4;
 636         cy1 = cy4;
 637     }
 638
 639     path.AddLineToPoint( x2 , y2 );
 640
 641     m_graphicContext->StrokePath( path );
 642 }
 643 #endif // wxUSE_SPLINES
 644
 645 void wxGCDCImpl::DoDrawPolygon( int n, wxPoint points[],
 646                             wxCoord xoffset, wxCoord yoffset,
 647                             int fillStyle )
 648 {
 649     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 650
 651     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 652         return;
 653     if ( !m_logicalFunctionSupported )
 654         return;
 655
 656     bool closeIt = false;
 657     if (points[n-1] != points[0])
 658         closeIt = true;
 659
 660     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 661     for( int i = 0; i < n; ++i)
 662     {
 663         pointsD[i].m_x = points[i].x + xoffset;
 664         pointsD[i].m_y = points[i].y + yoffset;
 665     }
 666     if ( closeIt )
 667         pointsD[n] = pointsD[0];
 668
 669     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 670     delete[] pointsD;
 671 }
 672
 673 void wxGCDCImpl::DoDrawPolyPolygon(int n,
 674                                int count[],
 675                                wxPoint points[],
 676                                wxCoord xoffset,
 677                                wxCoord yoffset,
 678                                int fillStyle)
 679 {
 680     wxASSERT(n > 1);
 681     wxGraphicsPath path = m_graphicContext->CreatePath();
 682
 683     int i = 0;
 684     for ( int j = 0; j < n; ++j)
 685     {
 686         wxPoint start = points[i];
 687         path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
 688         ++i;
 689         int l = count[j];
 690         for ( int k = 1; k < l; ++k)
 691         {
 692             path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
 693             ++i;
 694         }
 695         // close the polygon
 696         if ( start != points[i-1])
 697             path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
 698     }
 699     m_graphicContext->DrawPath( path , fillStyle);
 700 }
 701
 702 void wxGCDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 703 {
 704     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 705
 706     if ( !m_logicalFunctionSupported )
 707         return;
 708
 709     // CMB: draw nothing if transformed w or h is 0
 710     if (w == 0 || h == 0)
 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->DrawRectangle(x,y,w,h);
 721 }
 722
 723 void wxGCDCImpl::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 724                                     wxCoord w, wxCoord h,
 725                                     double radius)
 726 {
 727     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 728
 729     if ( !m_logicalFunctionSupported )
 730         return;
 731
 732     if (radius < 0.0)
 733         radius = - radius * ((w < h) ? w : h);
 734
 735     // CMB: draw nothing if transformed w or h is 0
 736     if (w == 0 || h == 0)
 737         return;
 738
 739     if ( m_graphicContext->ShouldOffset() )
 740     {
 741         // if we are offsetting the entire rectangle is moved 0.5, so the
 742         // border line gets off by 1
 743         w -= 1;
 744         h -= 1;
 745     }
 746     m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
 747 }
 748
 749 void wxGCDCImpl::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 750 {
 751     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 752
 753     if ( !m_logicalFunctionSupported )
 754         return;
 755
 756     if ( m_graphicContext->ShouldOffset() )
 757     {
 758         // if we are offsetting the entire rectangle is moved 0.5, so the
 759         // border line gets off by 1
 760         w -= 1;
 761         h -= 1;
 762     }
 763     m_graphicContext->DrawEllipse(x,y,w,h);
 764 }
 765
 766 bool wxGCDCImpl::CanDrawBitmap() const
 767 {
 768     return true;
 769 }
 770
 771 bool wxGCDCImpl::DoBlit(
 772     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 773     wxDC *source, wxCoord xsrc, wxCoord ysrc, int logical_func , bool useMask,
 774     wxCoord xsrcMask, wxCoord ysrcMask )
 775 {
 776     return DoStretchBlit( xdest, ydest, width, height,
 777         source, xsrc, ysrc, width, height, logical_func, useMask,
 778         xsrcMask,ysrcMask );
 779 }
 780
 781 bool wxGCDCImpl::DoStretchBlit(
 782     wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
 783     wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
 784     int logical_func , bool WXUNUSED(useMask),
 785     wxCoord xsrcMask, wxCoord ysrcMask )
 786 {
 787     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
 788     wxCHECK_MSG( source->IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid source DC") );
 789
 790     if ( logical_func == wxNO_OP )
 791         return true;
 792     else if ( !m_graphicContext->SetLogicalFunction( logical_func ) )
 793
 794     {
 795         wxFAIL_MSG( wxT("Blitting is only supported with wxCOPY logical operation.") );
 796         return false;
 797     }
 798
 799     if (xsrcMask == -1 && ysrcMask == -1)
 800     {
 801         xsrcMask = xsrc;
 802         ysrcMask = ysrc;
 803     }
 804
 805     wxRect subrect(source->LogicalToDeviceX(xsrc),
 806                    source->LogicalToDeviceY(ysrc),
 807                    source->LogicalToDeviceXRel(srcWidth),
 808                    source->LogicalToDeviceYRel(srcHeight));
 809
 810     // if needed clip the subrect down to the size of the source DC
 811     wxCoord sw, sh;
 812     source->GetSize(&sw, &sh);
 813     sw = source->LogicalToDeviceXRel(sw);
 814     sh = source->LogicalToDeviceYRel(sh);
 815     if (subrect.x + subrect.width > sw)
 816         subrect.width = sw - subrect.x;
 817     if (subrect.y + subrect.height > sh)
 818         subrect.height = sh - subrect.y;
 819
 820     wxBitmap blit = source->GetAsBitmap( &subrect );
 821
 822     if ( blit.IsOk() )
 823     {
 824         m_graphicContext->DrawBitmap( blit, xdest, ydest,
 825                                       dstWidth, dstHeight);
 826     }
 827     else
 828     {
 829         wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
 830         return false;
 831     }
 832
 833     // reset logical function
 834     m_graphicContext->SetLogicalFunction( m_logicalFunction );
 835
 836     return true;
 837 }
 838
 839 void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 840                                double angle)
 841 {
 842     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 843
 844     if ( str.length() == 0 )
 845         return;
 846     if ( !m_logicalFunctionSupported )
 847         return;
 848
 849     if ( m_backgroundMode == wxTRANSPARENT )
 850         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 851     else
 852         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ), m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 853 }
 854
 855 void wxGCDCImpl::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 856 {
 857     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 858
 859     if ( str.length() == 0 )
 860         return;
 861
 862     if ( !m_logicalFunctionSupported )
 863         return;
 864
 865     if ( m_backgroundMode == wxTRANSPARENT )
 866         m_graphicContext->DrawText( str, x ,y);
 867     else
 868         m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 869 }
 870
 871 bool wxGCDCImpl::CanGetTextExtent() const
 872 {
 873     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 874
 875     return true;
 876 }
 877
 878 void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
 879                               wxCoord *descent, wxCoord *externalLeading ,
 880                               const wxFont *theFont ) const
 881 {
 882     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 883
 884     if ( theFont )
 885     {
 886         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
 887     }
 888
 889     wxDouble h , d , e , w;
 890
 891     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
 892
 893     if ( height )
 894         *height = (wxCoord)(h+0.5);
 895     if ( descent )
 896         *descent = (wxCoord)(d+0.5);
 897     if ( externalLeading )
 898         *externalLeading = (wxCoord)(e+0.5);
 899     if ( width )
 900         *width = (wxCoord)(w+0.5);
 901
 902     if ( theFont )
 903     {
 904         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 905     }
 906 }
 907
 908 bool wxGCDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 909 {
 910     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
 911     widths.Clear();
 912     widths.Add(0,text.Length());
 913     if ( text.IsEmpty() )
 914         return true;
 915
 916     wxArrayDouble widthsD;
 917
 918     m_graphicContext->GetPartialTextExtents( text, widthsD );
 919     for ( size_t i = 0; i < widths.GetCount(); ++i )
 920         widths[i] = (wxCoord)(widthsD[i] + 0.5);
 921
 922     return true;
 923 }
 924
 925 wxCoord wxGCDCImpl::GetCharWidth(void) const
 926 {
 927     wxCoord width;
 928     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
 929
 930     return width;
 931 }
 932
 933 wxCoord wxGCDCImpl::GetCharHeight(void) const
 934 {
 935     wxCoord height;
 936     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
 937
 938     return height;
 939 }
 940
 941 void wxGCDCImpl::Clear(void)
 942 {
 943     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::Clear - invalid DC") );
 944     // TODO better implementation / incorporate size info into wxGCDC or context
 945     m_graphicContext->SetBrush( m_backgroundBrush );
 946     wxPen p = *wxTRANSPARENT_PEN;
 947     m_graphicContext->SetPen( p );
 948     DoDrawRectangle( 0, 0, 32000 , 32000 );
 949     m_graphicContext->SetPen( m_pen );
 950     m_graphicContext->SetBrush( m_brush );
 951 }
 952
 953 void wxGCDCImpl::DoGetSize(int *width, int *height) const
 954 {
 955     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetSize - invalid DC") );
 956     wxDouble w,h;
 957     m_graphicContext->GetSize( &w, &h );
 958     if ( height )
 959         *height = (int) (h+0.5);
 960     if ( width )
 961         *width = (int) (w+0.5);
 962 }
 963
 964 void wxGCDCImpl::DoGradientFillLinear(const wxRect& rect,
 965                                   const wxColour& initialColour,
 966                                   const wxColour& destColour,
 967                                   wxDirection nDirection )
 968 {
 969     wxPoint start;
 970     wxPoint end;
 971     switch( nDirection)
 972     {
 973     case wxWEST :
 974         start = rect.GetRightBottom();
 975         start.x++;
 976         end = rect.GetLeftBottom();
 977         break;
 978     case wxEAST :
 979         start = rect.GetLeftBottom();
 980         end = rect.GetRightBottom();
 981         end.x++;
 982         break;
 983     case wxNORTH :
 984         start = rect.GetLeftBottom();
 985         start.y++;
 986         end = rect.GetLeftTop();
 987         break;
 988     case wxSOUTH :
 989         start = rect.GetLeftTop();
 990         end = rect.GetLeftBottom();
 991         end.y++;
 992         break;
 993     default :
 994         break;
 995     }
 996
 997     if (rect.width == 0 || rect.height == 0)
 998         return;
 999
1000     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
1001         start.x,start.y,end.x,end.y, initialColour, destColour));
1002     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1003     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1004     m_graphicContext->SetPen(m_pen);
1005 }
1006
1007 void wxGCDCImpl::DoGradientFillConcentric(const wxRect& rect,
1008                                       const wxColour& initialColour,
1009                                       const wxColour& destColour,
1010                                       const wxPoint& circleCenter)
1011 {
1012     //Radius
1013     wxInt32 cx = rect.GetWidth() / 2;
1014     wxInt32 cy = rect.GetHeight() / 2;
1015     wxInt32 nRadius;
1016     if (cx < cy)
1017         nRadius = cx;
1018     else
1019         nRadius = cy;
1020
1021     // make sure the background is filled (todo move into specific platform implementation ?)
1022     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1023     m_graphicContext->SetBrush( wxBrush( destColour) );
1024     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1025
1026     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
1027         rect.x+circleCenter.x,rect.y+circleCenter.y,
1028         rect.x+circleCenter.x,rect.y+circleCenter.y,
1029         nRadius,initialColour,destColour));
1030
1031     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1032     m_graphicContext->SetPen(m_pen);
1033 }
1034
1035 void wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
1036                              wxCoord width, wxCoord height)
1037 {
1038     wxDCImpl::DoDrawCheckMark(x,y,width,height);
1039 }
1040
1041 #endif // wxUSE_GRAPHICS_CONTEXT