src/common/dcgraph.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/dcgraph.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_OR_COCOA__
  34 #ifdef __WXOSX_IPHONE__
  35     #include <CoreGraphics/CoreGraphics.h>
  36 #else
  37     #include <ApplicationServices/ApplicationServices.h>
  38 #endif
  39 #endif
  40
  41 //-----------------------------------------------------------------------------
  42 // constants
  43 //-----------------------------------------------------------------------------
  44
  45 static const double RAD2DEG = 180.0 / M_PI;
  46
  47 //-----------------------------------------------------------------------------
  48 // Local functions
  49 //-----------------------------------------------------------------------------
  50
  51 static inline double DegToRad(double deg)
  52 {
  53     return (deg * M_PI) / 180.0;
  54 }
  55
  56 static wxCompositionMode TranslateRasterOp(wxRasterOperationMode function)
  57 {
  58     switch ( function )
  59     {
  60         case wxCOPY: // src
  61             // since we are supporting alpha, _OVER is closer to the intention than _SOURCE
  62             // since the latter would overwrite even when alpha is not set to opaque
  63             return wxCOMPOSITION_OVER;
  64
  65         case wxOR:         // src OR dst
  66             return wxCOMPOSITION_ADD;
  67
  68         case wxNO_OP:      // dst
  69             return wxCOMPOSITION_DEST; // ignore the source
  70
  71         case wxCLEAR:      // 0
  72             return wxCOMPOSITION_CLEAR;// clear dst
  73
  74         case wxXOR:        // src XOR dst
  75             return wxCOMPOSITION_XOR;
  76
  77         case wxAND:        // src AND dst
  78         case wxAND_INVERT: // (NOT src) AND dst
  79         case wxAND_REVERSE:// src AND (NOT dst)
  80         case wxEQUIV:      // (NOT src) XOR dst
  81         case wxINVERT:     // NOT dst
  82         case wxNAND:       // (NOT src) OR (NOT dst)
  83         case wxNOR:        // (NOT src) AND (NOT dst)
  84         case wxOR_INVERT:  // (NOT src) OR dst
  85         case wxOR_REVERSE: // src OR (NOT dst)
  86         case wxSET:        // 1
  87         case wxSRC_INVERT: // NOT src
  88             break;
  89     }
  90
  91     return wxCOMPOSITION_INVALID;
  92 }
  93
  94 //-----------------------------------------------------------------------------
  95 // wxDC bridge class
  96 //-----------------------------------------------------------------------------
  97
  98 IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDC)
  99
 100 wxGCDC::wxGCDC(const wxWindowDC& dc) :
 101   wxDC( new wxGCDCImpl( this, dc ) )
 102 {
 103 }
 104
 105 wxGCDC::wxGCDC( const wxMemoryDC& dc) :
 106   wxDC( new wxGCDCImpl( this, dc ) )
 107 {
 108 }
 109
 110 #if wxUSE_PRINTING_ARCHITECTURE
 111 wxGCDC::wxGCDC( const wxPrinterDC& dc) :
 112   wxDC( new wxGCDCImpl( this, dc ) )
 113 {
 114 }
 115 #endif
 116
 117 #if defined(__WXMSW__) && wxUSE_ENH_METAFILE
 118 wxGCDC::wxGCDC(const wxEnhMetaFileDC& dc)
 119    : wxDC(new wxGCDCImpl(this, dc))
 120 {
 121 }
 122 #endif
 123
 124 wxGCDC::wxGCDC(wxGraphicsContext* context) :
 125     wxDC( new wxGCDCImpl( this ) )
 126 {
 127     SetGraphicsContext(context);
 128 }
 129
 130 wxGCDC::wxGCDC() :
 131   wxDC( new wxGCDCImpl( this ) )
 132 {
 133 }
 134
 135 wxGCDC::~wxGCDC()
 136 {
 137 }
 138
 139 wxGraphicsContext* wxGCDC::GetGraphicsContext() const
 140 {
 141     if (!m_pimpl) return NULL;
 142     wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
 143     return gc_impl->GetGraphicsContext();
 144 }
 145
 146 void wxGCDC::SetGraphicsContext( wxGraphicsContext* ctx )
 147 {
 148     if (!m_pimpl) return;
 149     wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
 150     gc_impl->SetGraphicsContext( ctx );
 151 }
 152
 153 IMPLEMENT_ABSTRACT_CLASS(wxGCDCImpl, wxDCImpl)
 154
 155 wxGCDCImpl::wxGCDCImpl( wxDC *owner ) :
 156    wxDCImpl( owner )
 157 {
 158     Init();
 159 }
 160
 161 void wxGCDCImpl::SetGraphicsContext( wxGraphicsContext* ctx )
 162 {
 163     delete m_graphicContext;
 164     m_graphicContext = ctx;
 165     if ( m_graphicContext )
 166     {
 167         m_matrixOriginal = m_graphicContext->GetTransform();
 168         m_ok = true;
 169         // apply the stored transformations to the passed in context
 170         ComputeScaleAndOrigin();
 171         m_graphicContext->SetFont( m_font , m_textForegroundColour );
 172         m_graphicContext->SetPen( m_pen );
 173         m_graphicContext->SetBrush( m_brush);
 174     }
 175 }
 176
 177 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxWindowDC& dc ) :
 178    wxDCImpl( owner )
 179 {
 180     Init();
 181     SetGraphicsContext( wxGraphicsContext::Create(dc) );
 182     m_window = dc.GetWindow();
 183 }
 184
 185 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxMemoryDC& dc ) :
 186    wxDCImpl( owner )
 187 {
 188     Init();
 189     wxGraphicsContext* context;
 190 #if wxUSE_CAIRO
 191     wxGraphicsRenderer* renderer = wxGraphicsRenderer::GetCairoRenderer();
 192     context = renderer->CreateContext(dc);
 193 #else
 194     context = wxGraphicsContext::Create(dc);
 195 #endif
 196
 197     SetGraphicsContext( context );
 198 }
 199
 200 #if wxUSE_PRINTING_ARCHITECTURE
 201 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxPrinterDC& dc ) :
 202    wxDCImpl( owner )
 203 {
 204     Init();
 205     SetGraphicsContext( wxGraphicsContext::Create(dc) );
 206 }
 207 #endif
 208
 209 #if defined(__WXMSW__) && wxUSE_ENH_METAFILE
 210 wxGCDCImpl::wxGCDCImpl(wxDC *owner, const wxEnhMetaFileDC& dc)
 211    : wxDCImpl(owner)
 212 {
 213     Init();
 214     SetGraphicsContext(wxGraphicsContext::Create(dc));
 215 }
 216 #endif
 217
 218 void wxGCDCImpl::Init()
 219 {
 220     m_ok = false;
 221     m_colour = true;
 222     m_mm_to_pix_x = mm2pt;
 223     m_mm_to_pix_y = mm2pt;
 224
 225     m_pen = *wxBLACK_PEN;
 226     m_font = *wxNORMAL_FONT;
 227     m_brush = *wxWHITE_BRUSH;
 228
 229     m_graphicContext = wxGraphicsContext::Create();
 230     m_logicalFunctionSupported = true;
 231 }
 232
 233
 234 wxGCDCImpl::~wxGCDCImpl()
 235 {
 236     delete m_graphicContext;
 237 }
 238
 239 void wxGCDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y,
 240                                bool useMask )
 241 {
 242     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
 243     wxCHECK_RET( bmp.IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
 244
 245     int w = bmp.GetWidth();
 246     int h = bmp.GetHeight();
 247     if ( bmp.GetDepth() == 1 )
 248     {
 249         m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 250         m_graphicContext->SetBrush( wxBrush( m_textBackgroundColour , wxSOLID ) );
 251         m_graphicContext->DrawRectangle( x, y, w, h );
 252         m_graphicContext->SetBrush( wxBrush( m_textForegroundColour , wxSOLID ) );
 253         m_graphicContext->DrawBitmap( bmp, x, y, w, h );
 254         m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
 255         m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
 256     }
 257     else // not a monochrome bitmap, handle it normally
 258     {
 259         // make a copy in case we need to remove its mask, if we don't modify
 260         // it the copy is cheap as bitmaps are reference-counted
 261         wxBitmap bmpCopy(bmp);
 262         if ( !useMask && bmp.GetMask() )
 263             bmpCopy.SetMask(NULL);
 264
 265         m_graphicContext->DrawBitmap( bmpCopy, x, y, w, h );
 266     }
 267 }
 268
 269 void wxGCDCImpl::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
 270 {
 271     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
 272     wxCHECK_RET( icon.IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
 273
 274     wxCoord w = icon.GetWidth();
 275     wxCoord h = icon.GetHeight();
 276
 277     m_graphicContext->DrawIcon( icon , x, y, w, h );
 278 }
 279
 280 bool wxGCDCImpl::StartDoc( const wxString& WXUNUSED(message) )
 281 {
 282     return true;
 283 }
 284
 285 void wxGCDCImpl::EndDoc()
 286 {
 287 }
 288
 289 void wxGCDCImpl::StartPage()
 290 {
 291 }
 292
 293 void wxGCDCImpl::EndPage()
 294 {
 295 }
 296
 297 void wxGCDCImpl::Flush()
 298 {
 299     m_graphicContext->Flush();
 300 }
 301
 302 void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
 303 {
 304     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
 305
 306     m_graphicContext->Clip( x, y, w, h );
 307     if ( m_clipping )
 308     {
 309         m_clipX1 = wxMax( m_clipX1, x );
 310         m_clipY1 = wxMax( m_clipY1, y );
 311         m_clipX2 = wxMin( m_clipX2, (x + w) );
 312         m_clipY2 = wxMin( m_clipY2, (y + h) );
 313     }
 314     else
 315     {
 316         m_clipping = true;
 317
 318         m_clipX1 = x;
 319         m_clipY1 = y;
 320         m_clipX2 = x + w;
 321         m_clipY2 = y + h;
 322     }
 323 }
 324
 325 void wxGCDCImpl::DoSetDeviceClippingRegion( const wxRegion &region )
 326 {
 327     // region is in device coordinates
 328     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetDeviceClippingRegion - invalid DC") );
 329
 330     if (region.Empty())
 331     {
 332         //DestroyClippingRegion();
 333         return;
 334     }
 335
 336     wxRegion logRegion( region );
 337     wxCoord x, y, w, h;
 338
 339     logRegion.Offset( DeviceToLogicalX(0), DeviceToLogicalY(0) );
 340     logRegion.GetBox( x, y, w, h );
 341
 342     m_graphicContext->Clip( logRegion );
 343     if ( m_clipping )
 344     {
 345         m_clipX1 = wxMax( m_clipX1, x );
 346         m_clipY1 = wxMax( m_clipY1, y );
 347         m_clipX2 = wxMin( m_clipX2, (x + w) );
 348         m_clipY2 = wxMin( m_clipY2, (y + h) );
 349     }
 350     else
 351     {
 352         m_clipping = true;
 353
 354         m_clipX1 = x;
 355         m_clipY1 = y;
 356         m_clipX2 = x + w;
 357         m_clipY2 = y + h;
 358     }
 359 }
 360
 361 void wxGCDCImpl::DestroyClippingRegion()
 362 {
 363     m_graphicContext->ResetClip();
 364     // currently the clip eg of a window extends to the area between the scrollbars
 365     // so we must explicitly make sure it only covers the area we want it to draw
 366     int width, height ;
 367     GetOwner()->GetSize( &width , &height ) ;
 368     m_graphicContext->Clip( DeviceToLogicalX(0) , DeviceToLogicalY(0) , DeviceToLogicalXRel(width), DeviceToLogicalYRel(height) );
 369
 370     m_graphicContext->SetPen( m_pen );
 371     m_graphicContext->SetBrush( m_brush );
 372
 373     m_clipping = false;
 374 }
 375
 376 void wxGCDCImpl::DoGetSizeMM( int* width, int* height ) const
 377 {
 378     int w = 0, h = 0;
 379
 380     GetOwner()->GetSize( &w, &h );
 381     if (width)
 382         *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
 383     if (height)
 384         *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
 385 }
 386
 387 void wxGCDCImpl::SetTextForeground( const wxColour &col )
 388 {
 389     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 390
 391     if ( col != m_textForegroundColour )
 392     {
 393         m_textForegroundColour = col;
 394         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 395     }
 396 }
 397
 398 void wxGCDCImpl::SetTextBackground( const wxColour &col )
 399 {
 400     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 401
 402     m_textBackgroundColour = col;
 403 }
 404
 405 void wxGCDCImpl::SetMapMode( wxMappingMode mode )
 406 {
 407     switch (mode)
 408     {
 409     case wxMM_TWIPS:
 410         SetLogicalScale( twips2mm * m_mm_to_pix_x, twips2mm * m_mm_to_pix_y );
 411         break;
 412
 413     case wxMM_POINTS:
 414         SetLogicalScale( pt2mm * m_mm_to_pix_x, pt2mm * m_mm_to_pix_y );
 415         break;
 416
 417     case wxMM_METRIC:
 418         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 419         break;
 420
 421     case wxMM_LOMETRIC:
 422         SetLogicalScale( m_mm_to_pix_x / 10.0, m_mm_to_pix_y / 10.0 );
 423         break;
 424
 425     case wxMM_TEXT:
 426     default:
 427         SetLogicalScale( 1.0, 1.0 );
 428         break;
 429     }
 430
 431     ComputeScaleAndOrigin();
 432 }
 433
 434 wxSize wxGCDCImpl::GetPPI() const
 435 {
 436     return wxSize(72, 72);
 437 }
 438
 439 int wxGCDCImpl::GetDepth() const
 440 {
 441     return 32;
 442 }
 443
 444 void wxGCDCImpl::ComputeScaleAndOrigin()
 445 {
 446     wxDCImpl::ComputeScaleAndOrigin();
 447
 448     if ( m_graphicContext )
 449     {
 450         m_matrixCurrent = m_graphicContext->CreateMatrix();
 451
 452         // the logical origin sets the origin to have new coordinates
 453         m_matrixCurrent.Translate( m_deviceOriginX - m_logicalOriginX * m_signX * m_scaleX,
 454                                    m_deviceOriginY-m_logicalOriginY * m_signY * m_scaleY);
 455
 456         m_matrixCurrent.Scale( m_scaleX * m_signX, m_scaleY * m_signY );
 457
 458         m_graphicContext->SetTransform( m_matrixOriginal );
 459         m_graphicContext->ConcatTransform( m_matrixCurrent );
 460     }
 461 }
 462
 463 void wxGCDCImpl::SetPalette( const wxPalette& WXUNUSED(palette) )
 464 {
 465
 466 }
 467
 468 void wxGCDCImpl::SetBackgroundMode( int mode )
 469 {
 470     m_backgroundMode = mode;
 471 }
 472
 473 void wxGCDCImpl::SetFont( const wxFont &font )
 474 {
 475     m_font = font;
 476     if ( m_graphicContext )
 477     {
 478         wxFont f = font;
 479         if ( f.IsOk() )
 480             f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
 481         m_graphicContext->SetFont( f, m_textForegroundColour );
 482     }
 483 }
 484
 485 void wxGCDCImpl::SetPen( const wxPen &pen )
 486 {
 487     if ( m_pen == pen )
 488         return;
 489
 490     m_pen = pen;
 491     if ( m_graphicContext )
 492     {
 493         m_graphicContext->SetPen( m_pen );
 494     }
 495 }
 496
 497 void wxGCDCImpl::SetBrush( const wxBrush &brush )
 498 {
 499     if (m_brush == brush)
 500         return;
 501
 502     m_brush = brush;
 503     if ( m_graphicContext )
 504     {
 505         m_graphicContext->SetBrush( m_brush );
 506     }
 507 }
 508
 509 void wxGCDCImpl::SetBackground( const wxBrush &brush )
 510 {
 511     if (m_backgroundBrush == brush)
 512         return;
 513
 514     m_backgroundBrush = brush;
 515     if (!m_backgroundBrush.IsOk())
 516         return;
 517 }
 518
 519 void wxGCDCImpl::SetLogicalFunction( wxRasterOperationMode function )
 520 {
 521     if (m_logicalFunction == function)
 522         return;
 523
 524     m_logicalFunction = function;
 525
 526     wxCompositionMode mode = TranslateRasterOp( function );
 527     m_logicalFunctionSupported = mode != wxCOMPOSITION_INVALID;
 528     if (m_logicalFunctionSupported)
 529         m_logicalFunctionSupported = m_graphicContext->SetCompositionMode(mode);
 530
 531     if ( function == wxXOR )
 532         m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 533     else
 534         m_graphicContext->SetAntialiasMode(wxANTIALIAS_DEFAULT);
 535 }
 536
 537 bool wxGCDCImpl::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 538                              const wxColour& WXUNUSED(col),
 539                              wxFloodFillStyle WXUNUSED(style))
 540 {
 541     return false;
 542 }
 543
 544 bool wxGCDCImpl::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 545 {
 546     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 547     return false;
 548 }
 549
 550 void wxGCDCImpl::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 551 {
 552     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 553
 554     if ( !m_logicalFunctionSupported )
 555         return;
 556
 557     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 558
 559     CalcBoundingBox(x1, y1);
 560     CalcBoundingBox(x2, y2);
 561 }
 562
 563 void wxGCDCImpl::DoCrossHair( wxCoord x, wxCoord y )
 564 {
 565     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 566
 567     if ( !m_logicalFunctionSupported )
 568         return;
 569
 570     int w = 0, h = 0;
 571
 572     GetOwner()->GetSize( &w, &h );
 573
 574     m_graphicContext->StrokeLine(0,y,w,y);
 575     m_graphicContext->StrokeLine(x,0,x,h);
 576
 577     CalcBoundingBox(0, 0);
 578     CalcBoundingBox(0+w, 0+h);
 579 }
 580
 581 void wxGCDCImpl::DoDrawArc( wxCoord x1, wxCoord y1,
 582                         wxCoord x2, wxCoord y2,
 583                         wxCoord xc, wxCoord yc )
 584 {
 585     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 586
 587     if ( !m_logicalFunctionSupported )
 588         return;
 589
 590     double dx = x1 - xc;
 591     double dy = y1 - yc;
 592     double radius = sqrt((double)(dx * dx + dy * dy));
 593     wxCoord rad = (wxCoord)radius;
 594     double sa, ea;
 595     if (x1 == x2 && y1 == y2)
 596     {
 597         sa = 0.0;
 598         ea = 360.0;
 599     }
 600     else if (radius == 0.0)
 601     {
 602         sa = ea = 0.0;
 603     }
 604     else
 605     {
 606         sa = (x1 - xc == 0) ?
 607      (y1 - yc < 0) ? 90.0 : -90.0 :
 608              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 609         ea = (x2 - xc == 0) ?
 610      (y2 - yc < 0) ? 90.0 : -90.0 :
 611              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 612     }
 613
 614     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 615
 616     wxGraphicsPath path = m_graphicContext->CreatePath();
 617     if ( fill && ((x1!=x2)||(y1!=y2)) )
 618         path.MoveToPoint( xc, yc );
 619     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 620     // get clockwise angles
 621     path.AddArc( xc, yc , rad , DegToRad(-sa) , DegToRad(-ea), false );
 622     if ( fill && ((x1!=x2)||(y1!=y2)) )
 623         path.AddLineToPoint( xc, yc );
 624     m_graphicContext->DrawPath(path);
 625 }
 626
 627 void wxGCDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 628                                 double sa, double ea )
 629 {
 630     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 631
 632     if ( !m_logicalFunctionSupported )
 633         return;
 634
 635     m_graphicContext->PushState();
 636     m_graphicContext->Translate(x+w/2.0,y+h/2.0);
 637     wxDouble factor = ((wxDouble) w) / h;
 638     m_graphicContext->Scale( factor , 1.0);
 639
 640     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 641     // get clockwise angles
 642     if ( m_brush.GetStyle() != wxTRANSPARENT )
 643     {
 644         wxGraphicsPath path = m_graphicContext->CreatePath();
 645         path.MoveToPoint( 0, 0 );
 646         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 647         path.AddLineToPoint( 0, 0 );
 648         m_graphicContext->FillPath( path );
 649
 650         path = m_graphicContext->CreatePath();
 651         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 652         m_graphicContext->StrokePath( path );
 653     }
 654     else
 655     {
 656         wxGraphicsPath path = m_graphicContext->CreatePath();
 657         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 658         m_graphicContext->DrawPath( path );
 659     }
 660
 661     m_graphicContext->PopState();
 662 }
 663
 664 void wxGCDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
 665 {
 666     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 667
 668     DoDrawLine( x , y , x + 1 , y + 1 );
 669 }
 670
 671 void wxGCDCImpl::DoDrawLines(int n, wxPoint points[],
 672                          wxCoord xoffset, wxCoord yoffset)
 673 {
 674     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 675
 676     if ( !m_logicalFunctionSupported )
 677         return;
 678
 679     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 680     for( int i = 0; i < n; ++i)
 681     {
 682         pointsD[i].m_x = points[i].x + xoffset;
 683         pointsD[i].m_y = points[i].y + yoffset;
 684     }
 685
 686     m_graphicContext->StrokeLines( n , pointsD);
 687     delete[] pointsD;
 688 }
 689
 690 #if wxUSE_SPLINES
 691 void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
 692 {
 693     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 694
 695     if ( !m_logicalFunctionSupported )
 696         return;
 697
 698     wxGraphicsPath path = m_graphicContext->CreatePath();
 699
 700     wxPointList::compatibility_iterator node = points->GetFirst();
 701     if ( !node )
 702         // empty list
 703         return;
 704
 705     wxPoint *p = node->GetData();
 706
 707     wxCoord x1 = p->x;
 708     wxCoord y1 = p->y;
 709
 710     node = node->GetNext();
 711     p = node->GetData();
 712
 713     wxCoord x2 = p->x;
 714     wxCoord y2 = p->y;
 715     wxCoord cx1 = ( x1 + x2 ) / 2;
 716     wxCoord cy1 = ( y1 + y2 ) / 2;
 717
 718     path.MoveToPoint( x1 , y1 );
 719     path.AddLineToPoint( cx1 , cy1 );
 720 #if !wxUSE_STD_CONTAINERS
 721
 722     while ((node = node->GetNext()) != NULL)
 723 #else
 724
 725     while ((node = node->GetNext()))
 726 #endif // !wxUSE_STD_CONTAINERS
 727
 728     {
 729         p = node->GetData();
 730         x1 = x2;
 731         y1 = y2;
 732         x2 = p->x;
 733         y2 = p->y;
 734         wxCoord cx4 = (x1 + x2) / 2;
 735         wxCoord cy4 = (y1 + y2) / 2;
 736
 737         path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 738
 739         cx1 = cx4;
 740         cy1 = cy4;
 741     }
 742
 743     path.AddLineToPoint( x2 , y2 );
 744
 745     m_graphicContext->StrokePath( path );
 746 }
 747 #endif // wxUSE_SPLINES
 748
 749 void wxGCDCImpl::DoDrawPolygon( int n, wxPoint points[],
 750                                 wxCoord xoffset, wxCoord yoffset,
 751                                 wxPolygonFillMode fillStyle )
 752 {
 753     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 754
 755     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 756         return;
 757     if ( !m_logicalFunctionSupported )
 758         return;
 759
 760     bool closeIt = false;
 761     if (points[n-1] != points[0])
 762         closeIt = true;
 763
 764     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 765     for( int i = 0; i < n; ++i)
 766     {
 767         pointsD[i].m_x = points[i].x + xoffset;
 768         pointsD[i].m_y = points[i].y + yoffset;
 769     }
 770     if ( closeIt )
 771         pointsD[n] = pointsD[0];
 772
 773     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 774     delete[] pointsD;
 775 }
 776
 777 void wxGCDCImpl::DoDrawPolyPolygon(int n,
 778                                int count[],
 779                                wxPoint points[],
 780                                wxCoord xoffset,
 781                                wxCoord yoffset,
 782                                wxPolygonFillMode fillStyle)
 783 {
 784     wxASSERT(n > 1);
 785     wxGraphicsPath path = m_graphicContext->CreatePath();
 786
 787     int i = 0;
 788     for ( int j = 0; j < n; ++j)
 789     {
 790         wxPoint start = points[i];
 791         path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
 792         ++i;
 793         int l = count[j];
 794         for ( int k = 1; k < l; ++k)
 795         {
 796             path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
 797             ++i;
 798         }
 799         // close the polygon
 800         if ( start != points[i-1])
 801             path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
 802     }
 803     m_graphicContext->DrawPath( path , fillStyle);
 804 }
 805
 806 void wxGCDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 807 {
 808     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 809
 810     if ( !m_logicalFunctionSupported )
 811         return;
 812
 813     // CMB: draw nothing if transformed w or h is 0
 814     if (w == 0 || h == 0)
 815         return;
 816
 817     if ( m_graphicContext->ShouldOffset() )
 818     {
 819         // if we are offsetting the entire rectangle is moved 0.5, so the
 820         // border line gets off by 1
 821         w -= 1;
 822         h -= 1;
 823     }
 824     m_graphicContext->DrawRectangle(x,y,w,h);
 825 }
 826
 827 void wxGCDCImpl::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 828                                     wxCoord w, wxCoord h,
 829                                     double radius)
 830 {
 831     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 832
 833     if ( !m_logicalFunctionSupported )
 834         return;
 835
 836     if (radius < 0.0)
 837         radius = - radius * ((w < h) ? w : h);
 838
 839     // CMB: draw nothing if transformed w or h is 0
 840     if (w == 0 || h == 0)
 841         return;
 842
 843     if ( m_graphicContext->ShouldOffset() )
 844     {
 845         // if we are offsetting the entire rectangle is moved 0.5, so the
 846         // border line gets off by 1
 847         w -= 1;
 848         h -= 1;
 849     }
 850     m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
 851 }
 852
 853 void wxGCDCImpl::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 854 {
 855     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 856
 857     if ( !m_logicalFunctionSupported )
 858         return;
 859
 860     if ( m_graphicContext->ShouldOffset() )
 861     {
 862         // if we are offsetting the entire rectangle is moved 0.5, so the
 863         // border line gets off by 1
 864         w -= 1;
 865         h -= 1;
 866     }
 867     m_graphicContext->DrawEllipse(x,y,w,h);
 868 }
 869
 870 bool wxGCDCImpl::CanDrawBitmap() const
 871 {
 872     return true;
 873 }
 874
 875 bool wxGCDCImpl::DoBlit(
 876     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 877     wxDC *source, wxCoord xsrc, wxCoord ysrc,
 878     wxRasterOperationMode logical_func , bool useMask,
 879     wxCoord xsrcMask, wxCoord ysrcMask )
 880 {
 881     return DoStretchBlit( xdest, ydest, width, height,
 882         source, xsrc, ysrc, width, height, logical_func, useMask,
 883         xsrcMask,ysrcMask );
 884 }
 885
 886 bool wxGCDCImpl::DoStretchBlit(
 887     wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
 888     wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
 889     wxRasterOperationMode logical_func , bool useMask,
 890     wxCoord xsrcMask, wxCoord ysrcMask )
 891 {
 892     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
 893     wxCHECK_MSG( source->IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid source DC") );
 894
 895     if ( logical_func == wxNO_OP )
 896         return true;
 897
 898     wxCompositionMode mode = TranslateRasterOp(logical_func);
 899     if ( mode == wxCOMPOSITION_INVALID )
 900     {
 901         wxFAIL_MSG( wxT("Blitting is not supported with this logical operation.") );
 902         return false;
 903     }
 904
 905     wxRect subrect(source->LogicalToDeviceX(xsrc),
 906                    source->LogicalToDeviceY(ysrc),
 907                    source->LogicalToDeviceXRel(srcWidth),
 908                    source->LogicalToDeviceYRel(srcHeight));
 909     // clip the subrect down to the size of the source DC
 910     wxRect clip;
 911     source->GetSize(&clip.width, &clip.height);
 912     subrect.Intersect(clip);
 913     if (subrect.width == 0)
 914         return true;
 915
 916     bool retval = true;
 917
 918     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
 919     if (m_graphicContext->SetCompositionMode(mode))
 920     {
 921         wxAntialiasMode formerAa = m_graphicContext->GetAntialiasMode();
 922         if (mode == wxCOMPOSITION_XOR)
 923         {
 924             m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 925         }
 926
 927         if (xsrcMask == -1 && ysrcMask == -1)
 928         {
 929             xsrcMask = xsrc;
 930             ysrcMask = ysrc;
 931         }
 932
 933         wxBitmap blit = source->GetAsBitmap( &subrect );
 934
 935         if ( blit.IsOk() )
 936         {
 937             if ( !useMask && blit.GetMask() )
 938                 blit.SetMask(NULL);
 939
 940             m_graphicContext->DrawBitmap( blit, xdest, ydest,
 941                                           dstWidth, dstHeight);
 942         }
 943         else
 944         {
 945             wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
 946             retval = false;
 947         }
 948
 949         if (mode == wxCOMPOSITION_XOR)
 950         {
 951             m_graphicContext->SetAntialiasMode(formerAa);
 952         }
 953     }
 954     // reset composition
 955     m_graphicContext->SetCompositionMode(formerMode);
 956
 957     return retval;
 958 }
 959
 960 void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 961                                double angle)
 962 {
 963     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 964
 965     if ( str.empty() )
 966         return;
 967     if ( !m_logicalFunctionSupported )
 968         return;
 969
 970     if ( m_backgroundMode == wxTRANSPARENT )
 971         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 972     else
 973         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ), m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 974 }
 975
 976 void wxGCDCImpl::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 977 {
 978     // For compatibility with other ports (notably wxGTK) and because it's
 979     // genuinely useful, we allow passing multiline strings to DrawText().
 980     // However there is no native OSX function to draw them directly so we
 981     // instead reuse the generic DrawLabel() method to render them. Of course,
 982     // DrawLabel() itself will call back to us but with single line strings
 983     // only so there won't be any infinite recursion here.
 984     if ( str.find('\n') != wxString::npos )
 985     {
 986         GetOwner()->DrawLabel(str, wxRect(x, y, 0, 0));
 987         return;
 988     }
 989
 990     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawText - invalid DC") );
 991
 992     if ( str.empty() )
 993         return;
 994
 995     if ( !m_logicalFunctionSupported )
 996         return;
 997
 998     if ( m_backgroundMode == wxTRANSPARENT )
 999         m_graphicContext->DrawText( str, x ,y);
1000     else
1001         m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
1002 }
1003
1004 bool wxGCDCImpl::CanGetTextExtent() const
1005 {
1006     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
1007
1008     return true;
1009 }
1010
1011 void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
1012                               wxCoord *descent, wxCoord *externalLeading ,
1013                               const wxFont *theFont ) const
1014 {
1015     wxCHECK_RET( m_graphicContext, wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
1016
1017     if ( theFont )
1018     {
1019         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
1020     }
1021
1022     wxDouble h , d , e , w;
1023
1024     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
1025
1026     if ( height )
1027         *height = (wxCoord)(h+0.5);
1028     if ( descent )
1029         *descent = (wxCoord)(d+0.5);
1030     if ( externalLeading )
1031         *externalLeading = (wxCoord)(e+0.5);
1032     if ( width )
1033         *width = (wxCoord)(w+0.5);
1034
1035     if ( theFont )
1036     {
1037         m_graphicContext->SetFont( m_font, m_textForegroundColour );
1038     }
1039 }
1040
1041 bool wxGCDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
1042 {
1043     wxCHECK_MSG( m_graphicContext, false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
1044     widths.Clear();
1045     widths.Add(0,text.Length());
1046     if ( text.IsEmpty() )
1047         return true;
1048
1049     wxArrayDouble widthsD;
1050
1051     m_graphicContext->GetPartialTextExtents( text, widthsD );
1052     for ( size_t i = 0; i < widths.GetCount(); ++i )
1053         widths[i] = (wxCoord)(widthsD[i] + 0.5);
1054
1055     return true;
1056 }
1057
1058 wxCoord wxGCDCImpl::GetCharWidth(void) const
1059 {
1060     wxCoord width;
1061     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
1062
1063     return width;
1064 }
1065
1066 wxCoord wxGCDCImpl::GetCharHeight(void) const
1067 {
1068     wxCoord height;
1069     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
1070
1071     return height;
1072 }
1073
1074 void wxGCDCImpl::Clear(void)
1075 {
1076     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::Clear - invalid DC") );
1077     // TODO better implementation / incorporate size info into wxGCDC or context
1078     m_graphicContext->SetBrush( m_backgroundBrush );
1079     wxPen p = *wxTRANSPARENT_PEN;
1080     m_graphicContext->SetPen( p );
1081     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
1082     m_graphicContext->SetCompositionMode(wxCOMPOSITION_SOURCE);
1083     DoDrawRectangle( 0, 0, 32000 , 32000 );
1084     m_graphicContext->SetCompositionMode(formerMode);
1085     m_graphicContext->SetPen( m_pen );
1086     m_graphicContext->SetBrush( m_brush );
1087 }
1088
1089 void wxGCDCImpl::DoGetSize(int *width, int *height) const
1090 {
1091     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetSize - invalid DC") );
1092     wxDouble w,h;
1093     m_graphicContext->GetSize( &w, &h );
1094     if ( height )
1095         *height = (int) (h+0.5);
1096     if ( width )
1097         *width = (int) (w+0.5);
1098 }
1099
1100 void wxGCDCImpl::DoGradientFillLinear(const wxRect& rect,
1101                                   const wxColour& initialColour,
1102                                   const wxColour& destColour,
1103                                   wxDirection nDirection )
1104 {
1105     wxPoint start;
1106     wxPoint end;
1107     switch( nDirection)
1108     {
1109     case wxWEST :
1110         start = rect.GetRightBottom();
1111         start.x++;
1112         end = rect.GetLeftBottom();
1113         break;
1114     case wxEAST :
1115         start = rect.GetLeftBottom();
1116         end = rect.GetRightBottom();
1117         end.x++;
1118         break;
1119     case wxNORTH :
1120         start = rect.GetLeftBottom();
1121         start.y++;
1122         end = rect.GetLeftTop();
1123         break;
1124     case wxSOUTH :
1125         start = rect.GetLeftTop();
1126         end = rect.GetLeftBottom();
1127         end.y++;
1128         break;
1129     default :
1130         break;
1131     }
1132
1133     if (rect.width == 0 || rect.height == 0)
1134         return;
1135
1136     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
1137         start.x,start.y,end.x,end.y, initialColour, destColour));
1138     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1139     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1140     m_graphicContext->SetPen(m_pen);
1141 }
1142
1143 void wxGCDCImpl::DoGradientFillConcentric(const wxRect& rect,
1144                                       const wxColour& initialColour,
1145                                       const wxColour& destColour,
1146                                       const wxPoint& circleCenter)
1147 {
1148     //Radius
1149     wxInt32 cx = rect.GetWidth() / 2;
1150     wxInt32 cy = rect.GetHeight() / 2;
1151     wxInt32 nRadius;
1152     if (cx < cy)
1153         nRadius = cx;
1154     else
1155         nRadius = cy;
1156
1157     // make sure the background is filled (todo move into specific platform implementation ?)
1158     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1159     m_graphicContext->SetBrush( wxBrush( destColour) );
1160     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1161
1162     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
1163         rect.x+circleCenter.x,rect.y+circleCenter.y,
1164         rect.x+circleCenter.x,rect.y+circleCenter.y,
1165         nRadius,initialColour,destColour));
1166
1167     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1168     m_graphicContext->SetPen(m_pen);
1169 }
1170
1171 void wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
1172                              wxCoord width, wxCoord height)
1173 {
1174     wxDCImpl::DoDrawCheckMark(x,y,width,height);
1175 }
1176
1177 #ifdef __WXMSW__
1178 wxRect wxGCDCImpl::MSWApplyGDIPlusTransform(const wxRect& r) const
1179 {
1180     wxGraphicsContext* const gc = GetGraphicsContext();
1181     wxCHECK_MSG( gc, r, wxT("Invalid wxGCDC") );
1182
1183     double x = 0,
1184            y = 0;
1185     gc->GetTransform().TransformPoint(&x, &y);
1186
1187     wxRect rect(r);
1188     rect.Offset(x, y);
1189
1190     return rect;
1191 }
1192 #endif // __WXMSW__
1193
1194 #endif // wxUSE_GRAPHICS_CONTEXT