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     context = wxGraphicsContext::Create(dc);
 191     SetGraphicsContext( context );
 192 }
 193
 194 #if wxUSE_PRINTING_ARCHITECTURE
 195 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxPrinterDC& dc ) :
 196    wxDCImpl( owner )
 197 {
 198     Init();
 199     SetGraphicsContext( wxGraphicsContext::Create(dc) );
 200 }
 201 #endif
 202
 203 #if defined(__WXMSW__) && wxUSE_ENH_METAFILE
 204 wxGCDCImpl::wxGCDCImpl(wxDC *owner, const wxEnhMetaFileDC& dc)
 205    : wxDCImpl(owner)
 206 {
 207     Init();
 208     SetGraphicsContext(wxGraphicsContext::Create(dc));
 209 }
 210 #endif
 211
 212 void wxGCDCImpl::Init()
 213 {
 214     m_ok = false;
 215     m_colour = true;
 216     m_mm_to_pix_x = mm2pt;
 217     m_mm_to_pix_y = mm2pt;
 218
 219     m_pen = *wxBLACK_PEN;
 220     m_font = *wxNORMAL_FONT;
 221     m_brush = *wxWHITE_BRUSH;
 222
 223     m_graphicContext = wxGraphicsContext::Create();
 224     m_logicalFunctionSupported = true;
 225 }
 226
 227
 228 wxGCDCImpl::~wxGCDCImpl()
 229 {
 230     delete m_graphicContext;
 231 }
 232
 233 void wxGCDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y,
 234                                bool useMask )
 235 {
 236     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
 237     wxCHECK_RET( bmp.IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
 238
 239     int w = bmp.GetWidth();
 240     int h = bmp.GetHeight();
 241     if ( bmp.GetDepth() == 1 )
 242     {
 243         m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 244         m_graphicContext->SetBrush( wxBrush( m_textBackgroundColour , wxSOLID ) );
 245         m_graphicContext->DrawRectangle( x, y, w, h );
 246         m_graphicContext->SetBrush( wxBrush( m_textForegroundColour , wxSOLID ) );
 247         m_graphicContext->DrawBitmap( bmp, x, y, w, h );
 248         m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
 249         m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
 250     }
 251     else // not a monochrome bitmap, handle it normally
 252     {
 253         // make a copy in case we need to remove its mask, if we don't modify
 254         // it the copy is cheap as bitmaps are reference-counted
 255         wxBitmap bmpCopy(bmp);
 256         if ( !useMask && bmp.GetMask() )
 257             bmpCopy.SetMask(NULL);
 258
 259         m_graphicContext->DrawBitmap( bmpCopy, x, y, w, h );
 260     }
 261 }
 262
 263 void wxGCDCImpl::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
 264 {
 265     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
 266     wxCHECK_RET( icon.IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
 267
 268     wxCoord w = icon.GetWidth();
 269     wxCoord h = icon.GetHeight();
 270
 271     m_graphicContext->DrawIcon( icon , x, y, w, h );
 272 }
 273
 274 bool wxGCDCImpl::StartDoc( const wxString& WXUNUSED(message) )
 275 {
 276     return true;
 277 }
 278
 279 void wxGCDCImpl::EndDoc()
 280 {
 281 }
 282
 283 void wxGCDCImpl::StartPage()
 284 {
 285 }
 286
 287 void wxGCDCImpl::EndPage()
 288 {
 289 }
 290
 291 void wxGCDCImpl::Flush()
 292 {
 293     m_graphicContext->Flush();
 294 }
 295
 296 void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
 297 {
 298     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
 299
 300     m_graphicContext->Clip( x, y, w, h );
 301     if ( m_clipping )
 302     {
 303         m_clipX1 = wxMax( m_clipX1, x );
 304         m_clipY1 = wxMax( m_clipY1, y );
 305         m_clipX2 = wxMin( m_clipX2, (x + w) );
 306         m_clipY2 = wxMin( m_clipY2, (y + h) );
 307     }
 308     else
 309     {
 310         m_clipping = true;
 311
 312         m_clipX1 = x;
 313         m_clipY1 = y;
 314         m_clipX2 = x + w;
 315         m_clipY2 = y + h;
 316     }
 317 }
 318
 319 void wxGCDCImpl::DoSetDeviceClippingRegion( const wxRegion &region )
 320 {
 321     // region is in device coordinates
 322     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetDeviceClippingRegion - invalid DC") );
 323
 324     if (region.Empty())
 325     {
 326         //DestroyClippingRegion();
 327         return;
 328     }
 329
 330     wxRegion logRegion( region );
 331     wxCoord x, y, w, h;
 332
 333     logRegion.Offset( DeviceToLogicalX(0), DeviceToLogicalY(0) );
 334     logRegion.GetBox( x, y, w, h );
 335
 336     m_graphicContext->Clip( logRegion );
 337     if ( m_clipping )
 338     {
 339         m_clipX1 = wxMax( m_clipX1, x );
 340         m_clipY1 = wxMax( m_clipY1, y );
 341         m_clipX2 = wxMin( m_clipX2, (x + w) );
 342         m_clipY2 = wxMin( m_clipY2, (y + h) );
 343     }
 344     else
 345     {
 346         m_clipping = true;
 347
 348         m_clipX1 = x;
 349         m_clipY1 = y;
 350         m_clipX2 = x + w;
 351         m_clipY2 = y + h;
 352     }
 353 }
 354
 355 void wxGCDCImpl::DestroyClippingRegion()
 356 {
 357     m_graphicContext->ResetClip();
 358     // currently the clip eg of a window extends to the area between the scrollbars
 359     // so we must explicitly make sure it only covers the area we want it to draw
 360     int width, height ;
 361     GetOwner()->GetSize( &width , &height ) ;
 362     m_graphicContext->Clip( DeviceToLogicalX(0) , DeviceToLogicalY(0) , DeviceToLogicalXRel(width), DeviceToLogicalYRel(height) );
 363
 364     m_graphicContext->SetPen( m_pen );
 365     m_graphicContext->SetBrush( m_brush );
 366
 367     m_clipping = false;
 368 }
 369
 370 void wxGCDCImpl::DoGetSizeMM( int* width, int* height ) const
 371 {
 372     int w = 0, h = 0;
 373
 374     GetOwner()->GetSize( &w, &h );
 375     if (width)
 376         *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
 377     if (height)
 378         *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
 379 }
 380
 381 void wxGCDCImpl::SetTextForeground( const wxColour &col )
 382 {
 383     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 384
 385     // don't set m_textForegroundColour to an invalid colour as we'd crash
 386     // later then (we use m_textForegroundColour.GetColor() without checking
 387     // in a few places)
 388     if ( col.IsOk() && col != m_textForegroundColour )
 389     {
 390         m_textForegroundColour = col;
 391         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 392     }
 393 }
 394
 395 void wxGCDCImpl::SetTextBackground( const wxColour &col )
 396 {
 397     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 398
 399     m_textBackgroundColour = col;
 400 }
 401
 402 void wxGCDCImpl::SetMapMode( wxMappingMode mode )
 403 {
 404     switch (mode)
 405     {
 406     case wxMM_TWIPS:
 407         SetLogicalScale( twips2mm * m_mm_to_pix_x, twips2mm * m_mm_to_pix_y );
 408         break;
 409
 410     case wxMM_POINTS:
 411         SetLogicalScale( pt2mm * m_mm_to_pix_x, pt2mm * m_mm_to_pix_y );
 412         break;
 413
 414     case wxMM_METRIC:
 415         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 416         break;
 417
 418     case wxMM_LOMETRIC:
 419         SetLogicalScale( m_mm_to_pix_x / 10.0, m_mm_to_pix_y / 10.0 );
 420         break;
 421
 422     case wxMM_TEXT:
 423     default:
 424         SetLogicalScale( 1.0, 1.0 );
 425         break;
 426     }
 427
 428     ComputeScaleAndOrigin();
 429 }
 430
 431 wxSize wxGCDCImpl::GetPPI() const
 432 {
 433     return wxSize(72, 72);
 434 }
 435
 436 int wxGCDCImpl::GetDepth() const
 437 {
 438     return 32;
 439 }
 440
 441 void wxGCDCImpl::ComputeScaleAndOrigin()
 442 {
 443     wxDCImpl::ComputeScaleAndOrigin();
 444
 445     if ( m_graphicContext )
 446     {
 447         m_matrixCurrent = m_graphicContext->CreateMatrix();
 448
 449         // the logical origin sets the origin to have new coordinates
 450         m_matrixCurrent.Translate( m_deviceOriginX - m_logicalOriginX * m_signX * m_scaleX,
 451                                    m_deviceOriginY-m_logicalOriginY * m_signY * m_scaleY);
 452
 453         m_matrixCurrent.Scale( m_scaleX * m_signX, m_scaleY * m_signY );
 454
 455         m_graphicContext->SetTransform( m_matrixOriginal );
 456         m_graphicContext->ConcatTransform( m_matrixCurrent );
 457     }
 458 }
 459
 460 void wxGCDCImpl::SetPalette( const wxPalette& WXUNUSED(palette) )
 461 {
 462
 463 }
 464
 465 void wxGCDCImpl::SetBackgroundMode( int mode )
 466 {
 467     m_backgroundMode = mode;
 468 }
 469
 470 void wxGCDCImpl::SetFont( const wxFont &font )
 471 {
 472     m_font = font;
 473     if ( m_graphicContext )
 474     {
 475         wxFont f = font;
 476         if ( f.IsOk() )
 477             f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
 478         m_graphicContext->SetFont( f, m_textForegroundColour );
 479     }
 480 }
 481
 482 void wxGCDCImpl::SetPen( const wxPen &pen )
 483 {
 484     if ( m_pen == pen )
 485         return;
 486
 487     m_pen = pen;
 488     if ( m_graphicContext )
 489     {
 490         m_graphicContext->SetPen( m_pen );
 491     }
 492 }
 493
 494 void wxGCDCImpl::SetBrush( const wxBrush &brush )
 495 {
 496     if (m_brush == brush)
 497         return;
 498
 499     m_brush = brush;
 500     if ( m_graphicContext )
 501     {
 502         m_graphicContext->SetBrush( m_brush );
 503     }
 504 }
 505
 506 void wxGCDCImpl::SetBackground( const wxBrush &brush )
 507 {
 508     if (m_backgroundBrush == brush)
 509         return;
 510
 511     m_backgroundBrush = brush;
 512     if (!m_backgroundBrush.IsOk())
 513         return;
 514 }
 515
 516 void wxGCDCImpl::SetLogicalFunction( wxRasterOperationMode function )
 517 {
 518     if (m_logicalFunction == function)
 519         return;
 520
 521     m_logicalFunction = function;
 522
 523     wxCompositionMode mode = TranslateRasterOp( function );
 524     m_logicalFunctionSupported = mode != wxCOMPOSITION_INVALID;
 525     if (m_logicalFunctionSupported)
 526         m_logicalFunctionSupported = m_graphicContext->SetCompositionMode(mode);
 527
 528     if ( function == wxXOR )
 529         m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 530     else
 531         m_graphicContext->SetAntialiasMode(wxANTIALIAS_DEFAULT);
 532 }
 533
 534 bool wxGCDCImpl::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 535                              const wxColour& WXUNUSED(col),
 536                              wxFloodFillStyle WXUNUSED(style))
 537 {
 538     return false;
 539 }
 540
 541 bool wxGCDCImpl::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 542 {
 543     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 544     return false;
 545 }
 546
 547 void wxGCDCImpl::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 548 {
 549     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 550
 551     if ( !m_logicalFunctionSupported )
 552         return;
 553
 554     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 555
 556     CalcBoundingBox(x1, y1);
 557     CalcBoundingBox(x2, y2);
 558 }
 559
 560 void wxGCDCImpl::DoCrossHair( wxCoord x, wxCoord y )
 561 {
 562     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 563
 564     if ( !m_logicalFunctionSupported )
 565         return;
 566
 567     int w = 0, h = 0;
 568
 569     GetOwner()->GetSize( &w, &h );
 570
 571     m_graphicContext->StrokeLine(0,y,w,y);
 572     m_graphicContext->StrokeLine(x,0,x,h);
 573
 574     CalcBoundingBox(0, 0);
 575     CalcBoundingBox(0+w, 0+h);
 576 }
 577
 578 void wxGCDCImpl::DoDrawArc( wxCoord x1, wxCoord y1,
 579                         wxCoord x2, wxCoord y2,
 580                         wxCoord xc, wxCoord yc )
 581 {
 582     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 583
 584     if ( !m_logicalFunctionSupported )
 585         return;
 586
 587     double dx = x1 - xc;
 588     double dy = y1 - yc;
 589     double radius = sqrt((double)(dx * dx + dy * dy));
 590     wxCoord rad = (wxCoord)radius;
 591     double sa, ea;
 592     if (x1 == x2 && y1 == y2)
 593     {
 594         sa = 0.0;
 595         ea = 360.0;
 596     }
 597     else if (radius == 0.0)
 598     {
 599         sa = ea = 0.0;
 600     }
 601     else
 602     {
 603         sa = (x1 - xc == 0) ?
 604      (y1 - yc < 0) ? 90.0 : -90.0 :
 605              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 606         ea = (x2 - xc == 0) ?
 607      (y2 - yc < 0) ? 90.0 : -90.0 :
 608              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 609     }
 610
 611     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 612
 613     wxGraphicsPath path = m_graphicContext->CreatePath();
 614     if ( fill && ((x1!=x2)||(y1!=y2)) )
 615         path.MoveToPoint( xc, yc );
 616     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 617     // get clockwise angles
 618     path.AddArc( xc, yc , rad , DegToRad(-sa) , DegToRad(-ea), false );
 619     if ( fill && ((x1!=x2)||(y1!=y2)) )
 620         path.AddLineToPoint( xc, yc );
 621     m_graphicContext->DrawPath(path);
 622 }
 623
 624 void wxGCDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 625                                 double sa, double ea )
 626 {
 627     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 628
 629     if ( !m_logicalFunctionSupported )
 630         return;
 631
 632     m_graphicContext->PushState();
 633     m_graphicContext->Translate(x+w/2.0,y+h/2.0);
 634     wxDouble factor = ((wxDouble) w) / h;
 635     m_graphicContext->Scale( factor , 1.0);
 636
 637     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 638     // get clockwise angles
 639     if ( m_brush.GetStyle() != wxTRANSPARENT )
 640     {
 641         wxGraphicsPath path = m_graphicContext->CreatePath();
 642         path.MoveToPoint( 0, 0 );
 643         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 644         path.AddLineToPoint( 0, 0 );
 645         m_graphicContext->FillPath( path );
 646
 647         path = m_graphicContext->CreatePath();
 648         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 649         m_graphicContext->StrokePath( path );
 650     }
 651     else
 652     {
 653         wxGraphicsPath path = m_graphicContext->CreatePath();
 654         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 655         m_graphicContext->DrawPath( path );
 656     }
 657
 658     m_graphicContext->PopState();
 659 }
 660
 661 void wxGCDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
 662 {
 663     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 664
 665     DoDrawLine( x , y , x + 1 , y + 1 );
 666 }
 667
 668 void wxGCDCImpl::DoDrawLines(int n, wxPoint points[],
 669                          wxCoord xoffset, wxCoord yoffset)
 670 {
 671     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 672
 673     if ( !m_logicalFunctionSupported )
 674         return;
 675
 676     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 677     for( int i = 0; i < n; ++i)
 678     {
 679         pointsD[i].m_x = points[i].x + xoffset;
 680         pointsD[i].m_y = points[i].y + yoffset;
 681     }
 682
 683     m_graphicContext->StrokeLines( n , pointsD);
 684     delete[] pointsD;
 685 }
 686
 687 #if wxUSE_SPLINES
 688 void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
 689 {
 690     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 691
 692     if ( !m_logicalFunctionSupported )
 693         return;
 694
 695     wxGraphicsPath path = m_graphicContext->CreatePath();
 696
 697     wxPointList::compatibility_iterator node = points->GetFirst();
 698     if ( !node )
 699         // empty list
 700         return;
 701
 702     wxPoint *p = node->GetData();
 703
 704     wxCoord x1 = p->x;
 705     wxCoord y1 = p->y;
 706
 707     node = node->GetNext();
 708     p = node->GetData();
 709
 710     wxCoord x2 = p->x;
 711     wxCoord y2 = p->y;
 712     wxCoord cx1 = ( x1 + x2 ) / 2;
 713     wxCoord cy1 = ( y1 + y2 ) / 2;
 714
 715     path.MoveToPoint( x1 , y1 );
 716     path.AddLineToPoint( cx1 , cy1 );
 717 #if !wxUSE_STD_CONTAINERS
 718
 719     while ((node = node->GetNext()) != NULL)
 720 #else
 721
 722     while ((node = node->GetNext()))
 723 #endif // !wxUSE_STD_CONTAINERS
 724
 725     {
 726         p = node->GetData();
 727         x1 = x2;
 728         y1 = y2;
 729         x2 = p->x;
 730         y2 = p->y;
 731         wxCoord cx4 = (x1 + x2) / 2;
 732         wxCoord cy4 = (y1 + y2) / 2;
 733
 734         path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 735
 736         cx1 = cx4;
 737         cy1 = cy4;
 738     }
 739
 740     path.AddLineToPoint( x2 , y2 );
 741
 742     m_graphicContext->StrokePath( path );
 743 }
 744 #endif // wxUSE_SPLINES
 745
 746 void wxGCDCImpl::DoDrawPolygon( int n, wxPoint points[],
 747                                 wxCoord xoffset, wxCoord yoffset,
 748                                 wxPolygonFillMode fillStyle )
 749 {
 750     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 751
 752     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 753         return;
 754     if ( !m_logicalFunctionSupported )
 755         return;
 756
 757     bool closeIt = false;
 758     if (points[n-1] != points[0])
 759         closeIt = true;
 760
 761     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 762     for( int i = 0; i < n; ++i)
 763     {
 764         pointsD[i].m_x = points[i].x + xoffset;
 765         pointsD[i].m_y = points[i].y + yoffset;
 766     }
 767     if ( closeIt )
 768         pointsD[n] = pointsD[0];
 769
 770     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 771     delete[] pointsD;
 772 }
 773
 774 void wxGCDCImpl::DoDrawPolyPolygon(int n,
 775                                int count[],
 776                                wxPoint points[],
 777                                wxCoord xoffset,
 778                                wxCoord yoffset,
 779                                wxPolygonFillMode fillStyle)
 780 {
 781     wxASSERT(n > 1);
 782     wxGraphicsPath path = m_graphicContext->CreatePath();
 783
 784     int i = 0;
 785     for ( int j = 0; j < n; ++j)
 786     {
 787         wxPoint start = points[i];
 788         path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
 789         ++i;
 790         int l = count[j];
 791         for ( int k = 1; k < l; ++k)
 792         {
 793             path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
 794             ++i;
 795         }
 796         // close the polygon
 797         if ( start != points[i-1])
 798             path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
 799     }
 800     m_graphicContext->DrawPath( path , fillStyle);
 801 }
 802
 803 void wxGCDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 804 {
 805     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 806
 807     if ( !m_logicalFunctionSupported )
 808         return;
 809
 810     // CMB: draw nothing if transformed w or h is 0
 811     if (w == 0 || h == 0)
 812         return;
 813
 814     if ( m_graphicContext->ShouldOffset() )
 815     {
 816         // if we are offsetting the entire rectangle is moved 0.5, so the
 817         // border line gets off by 1
 818         w -= 1;
 819         h -= 1;
 820     }
 821     m_graphicContext->DrawRectangle(x,y,w,h);
 822 }
 823
 824 void wxGCDCImpl::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 825                                     wxCoord w, wxCoord h,
 826                                     double radius)
 827 {
 828     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 829
 830     if ( !m_logicalFunctionSupported )
 831         return;
 832
 833     if (radius < 0.0)
 834         radius = - radius * ((w < h) ? w : h);
 835
 836     // CMB: draw nothing if transformed w or h is 0
 837     if (w == 0 || h == 0)
 838         return;
 839
 840     if ( m_graphicContext->ShouldOffset() )
 841     {
 842         // if we are offsetting the entire rectangle is moved 0.5, so the
 843         // border line gets off by 1
 844         w -= 1;
 845         h -= 1;
 846     }
 847     m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
 848 }
 849
 850 void wxGCDCImpl::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 851 {
 852     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 853
 854     if ( !m_logicalFunctionSupported )
 855         return;
 856
 857     if ( m_graphicContext->ShouldOffset() )
 858     {
 859         // if we are offsetting the entire rectangle is moved 0.5, so the
 860         // border line gets off by 1
 861         w -= 1;
 862         h -= 1;
 863     }
 864     m_graphicContext->DrawEllipse(x,y,w,h);
 865 }
 866
 867 bool wxGCDCImpl::CanDrawBitmap() const
 868 {
 869     return true;
 870 }
 871
 872 bool wxGCDCImpl::DoBlit(
 873     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 874     wxDC *source, wxCoord xsrc, wxCoord ysrc,
 875     wxRasterOperationMode logical_func , bool useMask,
 876     wxCoord xsrcMask, wxCoord ysrcMask )
 877 {
 878     return DoStretchBlit( xdest, ydest, width, height,
 879         source, xsrc, ysrc, width, height, logical_func, useMask,
 880         xsrcMask,ysrcMask );
 881 }
 882
 883 bool wxGCDCImpl::DoStretchBlit(
 884     wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
 885     wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
 886     wxRasterOperationMode logical_func , bool useMask,
 887     wxCoord xsrcMask, wxCoord ysrcMask )
 888 {
 889     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
 890     wxCHECK_MSG( source->IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid source DC") );
 891
 892     if ( logical_func == wxNO_OP )
 893         return true;
 894
 895     wxCompositionMode mode = TranslateRasterOp(logical_func);
 896     if ( mode == wxCOMPOSITION_INVALID )
 897     {
 898         wxFAIL_MSG( wxT("Blitting is not supported with this logical operation.") );
 899         return false;
 900     }
 901
 902     wxRect subrect(source->LogicalToDeviceX(xsrc),
 903                    source->LogicalToDeviceY(ysrc),
 904                    source->LogicalToDeviceXRel(srcWidth),
 905                    source->LogicalToDeviceYRel(srcHeight));
 906     const wxRect subrectOrig = subrect;
 907     // clip the subrect down to the size of the source DC
 908     wxRect clip;
 909     source->GetSize(&clip.width, &clip.height);
 910     subrect.Intersect(clip);
 911     if (subrect.width == 0)
 912         return true;
 913
 914     bool retval = true;
 915
 916     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
 917     if (m_graphicContext->SetCompositionMode(mode))
 918     {
 919         wxAntialiasMode formerAa = m_graphicContext->GetAntialiasMode();
 920         if (mode == wxCOMPOSITION_XOR)
 921         {
 922             m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 923         }
 924
 925         if (xsrcMask == -1 && ysrcMask == -1)
 926         {
 927             xsrcMask = xsrc;
 928             ysrcMask = ysrc;
 929         }
 930
 931         wxBitmap blit = source->GetAsBitmap( &subrect );
 932
 933         if ( blit.IsOk() )
 934         {
 935             if ( !useMask && blit.GetMask() )
 936                 blit.SetMask(NULL);
 937
 938             double x = xdest;
 939             double y = ydest;
 940             double w = dstWidth;
 941             double h = dstHeight;
 942             // adjust dest rect if source rect is clipped
 943             if (subrect.width != subrectOrig.width || subrect.height != subrectOrig.height)
 944             {
 945                 x += (subrect.x - subrectOrig.x) / double(subrectOrig.width) * dstWidth;
 946                 y += (subrect.y - subrectOrig.y) / double(subrectOrig.height) * dstHeight;
 947                 w *= double(subrect.width) / subrectOrig.width;
 948                 h *= double(subrect.height) / subrectOrig.height;
 949             }
 950             m_graphicContext->DrawBitmap(blit, x, y, w, h);
 951         }
 952         else
 953         {
 954             wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
 955             retval = false;
 956         }
 957
 958         if (mode == wxCOMPOSITION_XOR)
 959         {
 960             m_graphicContext->SetAntialiasMode(formerAa);
 961         }
 962     }
 963     // reset composition
 964     m_graphicContext->SetCompositionMode(formerMode);
 965
 966     return retval;
 967 }
 968
 969 void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 970                                double angle)
 971 {
 972     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 973
 974     if ( str.empty() )
 975         return;
 976     if ( !m_logicalFunctionSupported )
 977         return;
 978
 979     if ( m_backgroundMode == wxTRANSPARENT )
 980         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 981     else
 982         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ), m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 983 }
 984
 985 void wxGCDCImpl::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 986 {
 987     // For compatibility with other ports (notably wxGTK) and because it's
 988     // genuinely useful, we allow passing multiline strings to DrawText().
 989     // However there is no native OSX function to draw them directly so we
 990     // instead reuse the generic DrawLabel() method to render them. Of course,
 991     // DrawLabel() itself will call back to us but with single line strings
 992     // only so there won't be any infinite recursion here.
 993     if ( str.find('\n') != wxString::npos )
 994     {
 995         GetOwner()->DrawLabel(str, wxRect(x, y, 0, 0));
 996         return;
 997     }
 998
 999     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawText - invalid DC") );
1000
1001     if ( str.empty() )
1002         return;
1003
1004     if ( !m_logicalFunctionSupported )
1005         return;
1006
1007     if ( m_backgroundMode == wxTRANSPARENT )
1008         m_graphicContext->DrawText( str, x ,y);
1009     else
1010         m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
1011 }
1012
1013 bool wxGCDCImpl::CanGetTextExtent() const
1014 {
1015     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
1016
1017     return true;
1018 }
1019
1020 void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
1021                               wxCoord *descent, wxCoord *externalLeading ,
1022                               const wxFont *theFont ) const
1023 {
1024     wxCHECK_RET( m_graphicContext, wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
1025
1026     if ( theFont )
1027     {
1028         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
1029     }
1030
1031     wxDouble h , d , e , w;
1032
1033     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
1034
1035     if ( height )
1036         *height = (wxCoord)(h+0.5);
1037     if ( descent )
1038         *descent = (wxCoord)(d+0.5);
1039     if ( externalLeading )
1040         *externalLeading = (wxCoord)(e+0.5);
1041     if ( width )
1042         *width = (wxCoord)(w+0.5);
1043
1044     if ( theFont )
1045     {
1046         m_graphicContext->SetFont( m_font, m_textForegroundColour );
1047     }
1048 }
1049
1050 bool wxGCDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
1051 {
1052     wxCHECK_MSG( m_graphicContext, false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
1053     widths.Clear();
1054     widths.Add(0,text.Length());
1055     if ( text.IsEmpty() )
1056         return true;
1057
1058     wxArrayDouble widthsD;
1059
1060     m_graphicContext->GetPartialTextExtents( text, widthsD );
1061     for ( size_t i = 0; i < widths.GetCount(); ++i )
1062         widths[i] = (wxCoord)(widthsD[i] + 0.5);
1063
1064     return true;
1065 }
1066
1067 wxCoord wxGCDCImpl::GetCharWidth(void) const
1068 {
1069     wxCoord width;
1070     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
1071
1072     return width;
1073 }
1074
1075 wxCoord wxGCDCImpl::GetCharHeight(void) const
1076 {
1077     wxCoord height;
1078     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
1079
1080     return height;
1081 }
1082
1083 void wxGCDCImpl::Clear(void)
1084 {
1085     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::Clear - invalid DC") );
1086     // TODO better implementation / incorporate size info into wxGCDC or context
1087     m_graphicContext->SetBrush( m_backgroundBrush );
1088     wxPen p = *wxTRANSPARENT_PEN;
1089     m_graphicContext->SetPen( p );
1090     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
1091     m_graphicContext->SetCompositionMode(wxCOMPOSITION_SOURCE);
1092     DoDrawRectangle( 0, 0, 32000 , 32000 );
1093     m_graphicContext->SetCompositionMode(formerMode);
1094     m_graphicContext->SetPen( m_pen );
1095     m_graphicContext->SetBrush( m_brush );
1096 }
1097
1098 void wxGCDCImpl::DoGetSize(int *width, int *height) const
1099 {
1100     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetSize - invalid DC") );
1101     wxDouble w,h;
1102     m_graphicContext->GetSize( &w, &h );
1103     if ( height )
1104         *height = (int) (h+0.5);
1105     if ( width )
1106         *width = (int) (w+0.5);
1107 }
1108
1109 void wxGCDCImpl::DoGradientFillLinear(const wxRect& rect,
1110                                   const wxColour& initialColour,
1111                                   const wxColour& destColour,
1112                                   wxDirection nDirection )
1113 {
1114     wxPoint start;
1115     wxPoint end;
1116     switch( nDirection)
1117     {
1118     case wxWEST :
1119         start = rect.GetRightBottom();
1120         start.x++;
1121         end = rect.GetLeftBottom();
1122         break;
1123     case wxEAST :
1124         start = rect.GetLeftBottom();
1125         end = rect.GetRightBottom();
1126         end.x++;
1127         break;
1128     case wxNORTH :
1129         start = rect.GetLeftBottom();
1130         start.y++;
1131         end = rect.GetLeftTop();
1132         break;
1133     case wxSOUTH :
1134         start = rect.GetLeftTop();
1135         end = rect.GetLeftBottom();
1136         end.y++;
1137         break;
1138     default :
1139         break;
1140     }
1141
1142     if (rect.width == 0 || rect.height == 0)
1143         return;
1144
1145     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
1146         start.x,start.y,end.x,end.y, initialColour, destColour));
1147     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1148     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1149     m_graphicContext->SetPen(m_pen);
1150     m_graphicContext->SetBrush(m_brush);
1151 }
1152
1153 void wxGCDCImpl::DoGradientFillConcentric(const wxRect& rect,
1154                                       const wxColour& initialColour,
1155                                       const wxColour& destColour,
1156                                       const wxPoint& circleCenter)
1157 {
1158     //Radius
1159     wxInt32 cx = rect.GetWidth() / 2;
1160     wxInt32 cy = rect.GetHeight() / 2;
1161     wxInt32 nRadius;
1162     if (cx < cy)
1163         nRadius = cx;
1164     else
1165         nRadius = cy;
1166
1167     // make sure the background is filled (todo move into specific platform implementation ?)
1168     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1169     m_graphicContext->SetBrush( wxBrush( destColour) );
1170     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1171
1172     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
1173         rect.x+circleCenter.x,rect.y+circleCenter.y,
1174         rect.x+circleCenter.x,rect.y+circleCenter.y,
1175         nRadius,initialColour,destColour));
1176
1177     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1178     m_graphicContext->SetPen(m_pen);
1179     m_graphicContext->SetBrush(m_brush);
1180 }
1181
1182 void wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
1183                              wxCoord width, wxCoord height)
1184 {
1185     wxDCImpl::DoDrawCheckMark(x,y,width,height);
1186 }
1187
1188 #ifdef __WXMSW__
1189 wxRect wxGCDCImpl::MSWApplyGDIPlusTransform(const wxRect& r) const
1190 {
1191     wxGraphicsContext* const gc = GetGraphicsContext();
1192     wxCHECK_MSG( gc, r, wxT("Invalid wxGCDC") );
1193
1194     double x = 0,
1195            y = 0;
1196     gc->GetTransform().TransformPoint(&x, &y);
1197
1198     wxRect rect(r);
1199     rect.Offset(x, y);
1200
1201     return rect;
1202 }
1203 #endif // __WXMSW__
1204
1205 #endif // wxUSE_GRAPHICS_CONTEXT