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