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() )
 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 wxSize wxGCDCImpl::GetPPI() const
 403 {
 404     return wxSize(72, 72);
 405 }
 406
 407 int wxGCDCImpl::GetDepth() const
 408 {
 409     return 32;
 410 }
 411
 412 void wxGCDCImpl::ComputeScaleAndOrigin()
 413 {
 414     wxDCImpl::ComputeScaleAndOrigin();
 415
 416     if ( m_graphicContext )
 417     {
 418         m_matrixCurrent = m_graphicContext->CreateMatrix();
 419
 420         // the logical origin sets the origin to have new coordinates
 421         m_matrixCurrent.Translate( m_deviceOriginX - m_logicalOriginX * m_signX * m_scaleX,
 422                                    m_deviceOriginY-m_logicalOriginY * m_signY * m_scaleY);
 423
 424         m_matrixCurrent.Scale( m_scaleX * m_signX, m_scaleY * m_signY );
 425
 426         m_graphicContext->SetTransform( m_matrixOriginal );
 427         m_graphicContext->ConcatTransform( m_matrixCurrent );
 428     }
 429 }
 430
 431 void wxGCDCImpl::SetPalette( const wxPalette& WXUNUSED(palette) )
 432 {
 433
 434 }
 435
 436 void wxGCDCImpl::SetBackgroundMode( int mode )
 437 {
 438     m_backgroundMode = mode;
 439 }
 440
 441 void wxGCDCImpl::SetFont( const wxFont &font )
 442 {
 443     m_font = font;
 444     if ( m_graphicContext )
 445     {
 446         wxFont f = font;
 447         if ( f.IsOk() )
 448             f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
 449         m_graphicContext->SetFont( f, m_textForegroundColour );
 450     }
 451 }
 452
 453 void wxGCDCImpl::SetPen( const wxPen &pen )
 454 {
 455     m_pen = pen;
 456     if ( m_graphicContext )
 457     {
 458         m_graphicContext->SetPen( m_pen );
 459     }
 460 }
 461
 462 void wxGCDCImpl::SetBrush( const wxBrush &brush )
 463 {
 464     m_brush = brush;
 465     if ( m_graphicContext )
 466     {
 467         m_graphicContext->SetBrush( m_brush );
 468     }
 469 }
 470
 471 void wxGCDCImpl::SetBackground( const wxBrush &brush )
 472 {
 473     m_backgroundBrush = brush;
 474     if (!m_backgroundBrush.IsOk())
 475         return;
 476 }
 477
 478 void wxGCDCImpl::SetLogicalFunction( wxRasterOperationMode function )
 479 {
 480     m_logicalFunction = function;
 481
 482     wxCompositionMode mode = TranslateRasterOp( function );
 483     m_logicalFunctionSupported = mode != wxCOMPOSITION_INVALID;
 484     if (m_logicalFunctionSupported)
 485         m_logicalFunctionSupported = m_graphicContext->SetCompositionMode(mode);
 486
 487     if ( function == wxXOR )
 488         m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 489     else
 490         m_graphicContext->SetAntialiasMode(wxANTIALIAS_DEFAULT);
 491 }
 492
 493 bool wxGCDCImpl::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 494                              const wxColour& WXUNUSED(col),
 495                              wxFloodFillStyle WXUNUSED(style))
 496 {
 497     return false;
 498 }
 499
 500 bool wxGCDCImpl::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 501 {
 502     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 503     return false;
 504 }
 505
 506 void wxGCDCImpl::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 507 {
 508     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 509
 510     if ( !m_logicalFunctionSupported )
 511         return;
 512
 513     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 514
 515     CalcBoundingBox(x1, y1);
 516     CalcBoundingBox(x2, y2);
 517 }
 518
 519 void wxGCDCImpl::DoCrossHair( wxCoord x, wxCoord y )
 520 {
 521     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 522
 523     if ( !m_logicalFunctionSupported )
 524         return;
 525
 526     int w = 0, h = 0;
 527
 528     GetOwner()->GetSize( &w, &h );
 529
 530     m_graphicContext->StrokeLine(0,y,w,y);
 531     m_graphicContext->StrokeLine(x,0,x,h);
 532
 533     CalcBoundingBox(0, 0);
 534     CalcBoundingBox(0+w, 0+h);
 535 }
 536
 537 void wxGCDCImpl::DoDrawArc( wxCoord x1, wxCoord y1,
 538                         wxCoord x2, wxCoord y2,
 539                         wxCoord xc, wxCoord yc )
 540 {
 541     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 542
 543     if ( !m_logicalFunctionSupported )
 544         return;
 545
 546     double dx = x1 - xc;
 547     double dy = y1 - yc;
 548     double radius = sqrt((double)(dx * dx + dy * dy));
 549     wxCoord rad = (wxCoord)radius;
 550     double sa, ea;
 551     if (x1 == x2 && y1 == y2)
 552     {
 553         sa = 0.0;
 554         ea = 360.0;
 555     }
 556     else if (radius == 0.0)
 557     {
 558         sa = ea = 0.0;
 559     }
 560     else
 561     {
 562         sa = (x1 - xc == 0) ?
 563      (y1 - yc < 0) ? 90.0 : -90.0 :
 564              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 565         ea = (x2 - xc == 0) ?
 566      (y2 - yc < 0) ? 90.0 : -90.0 :
 567              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 568     }
 569
 570     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 571
 572     wxGraphicsPath path = m_graphicContext->CreatePath();
 573     if ( fill && ((x1!=x2)||(y1!=y2)) )
 574         path.MoveToPoint( xc, yc );
 575     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 576     // get clockwise angles
 577     path.AddArc( xc, yc , rad , DegToRad(-sa) , DegToRad(-ea), false );
 578     if ( fill && ((x1!=x2)||(y1!=y2)) )
 579         path.AddLineToPoint( xc, yc );
 580     m_graphicContext->DrawPath(path);
 581 }
 582
 583 void wxGCDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 584                                 double sa, double ea )
 585 {
 586     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 587
 588     if ( !m_logicalFunctionSupported )
 589         return;
 590
 591     m_graphicContext->PushState();
 592     m_graphicContext->Translate(x+w/2.0,y+h/2.0);
 593     wxDouble factor = ((wxDouble) w) / h;
 594     m_graphicContext->Scale( factor , 1.0);
 595
 596     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 597     // get clockwise angles
 598     if ( m_brush.GetStyle() != wxTRANSPARENT )
 599     {
 600         wxGraphicsPath path = m_graphicContext->CreatePath();
 601         path.MoveToPoint( 0, 0 );
 602         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 603         path.AddLineToPoint( 0, 0 );
 604         m_graphicContext->FillPath( path );
 605
 606         path = m_graphicContext->CreatePath();
 607         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 608         m_graphicContext->StrokePath( path );
 609     }
 610     else
 611     {
 612         wxGraphicsPath path = m_graphicContext->CreatePath();
 613         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 614         m_graphicContext->DrawPath( path );
 615     }
 616
 617     m_graphicContext->PopState();
 618 }
 619
 620 void wxGCDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
 621 {
 622     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 623
 624     DoDrawLine( x , y , x + 1 , y + 1 );
 625 }
 626
 627 void wxGCDCImpl::DoDrawLines(int n, wxPoint points[],
 628                          wxCoord xoffset, wxCoord yoffset)
 629 {
 630     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 631
 632     if ( !m_logicalFunctionSupported )
 633         return;
 634
 635     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 636     for( int i = 0; i < n; ++i)
 637     {
 638         pointsD[i].m_x = points[i].x + xoffset;
 639         pointsD[i].m_y = points[i].y + yoffset;
 640     }
 641
 642     m_graphicContext->StrokeLines( n , pointsD);
 643     delete[] pointsD;
 644 }
 645
 646 #if wxUSE_SPLINES
 647 void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
 648 {
 649     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 650
 651     if ( !m_logicalFunctionSupported )
 652         return;
 653
 654     wxGraphicsPath path = m_graphicContext->CreatePath();
 655
 656     wxPointList::compatibility_iterator node = points->GetFirst();
 657     if ( !node )
 658         // empty list
 659         return;
 660
 661     wxPoint *p = node->GetData();
 662
 663     wxCoord x1 = p->x;
 664     wxCoord y1 = p->y;
 665
 666     node = node->GetNext();
 667     p = node->GetData();
 668
 669     wxCoord x2 = p->x;
 670     wxCoord y2 = p->y;
 671     wxCoord cx1 = ( x1 + x2 ) / 2;
 672     wxCoord cy1 = ( y1 + y2 ) / 2;
 673
 674     path.MoveToPoint( x1 , y1 );
 675     path.AddLineToPoint( cx1 , cy1 );
 676 #if !wxUSE_STD_CONTAINERS
 677
 678     while ((node = node->GetNext()) != NULL)
 679 #else
 680
 681     while ((node = node->GetNext()))
 682 #endif // !wxUSE_STD_CONTAINERS
 683
 684     {
 685         p = node->GetData();
 686         x1 = x2;
 687         y1 = y2;
 688         x2 = p->x;
 689         y2 = p->y;
 690         wxCoord cx4 = (x1 + x2) / 2;
 691         wxCoord cy4 = (y1 + y2) / 2;
 692
 693         path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 694
 695         cx1 = cx4;
 696         cy1 = cy4;
 697     }
 698
 699     path.AddLineToPoint( x2 , y2 );
 700
 701     m_graphicContext->StrokePath( path );
 702 }
 703 #endif // wxUSE_SPLINES
 704
 705 void wxGCDCImpl::DoDrawPolygon( int n, wxPoint points[],
 706                                 wxCoord xoffset, wxCoord yoffset,
 707                                 wxPolygonFillMode fillStyle )
 708 {
 709     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 710
 711     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 712         return;
 713     if ( !m_logicalFunctionSupported )
 714         return;
 715
 716     bool closeIt = false;
 717     if (points[n-1] != points[0])
 718         closeIt = true;
 719
 720     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 721     for( int i = 0; i < n; ++i)
 722     {
 723         pointsD[i].m_x = points[i].x + xoffset;
 724         pointsD[i].m_y = points[i].y + yoffset;
 725     }
 726     if ( closeIt )
 727         pointsD[n] = pointsD[0];
 728
 729     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 730     delete[] pointsD;
 731 }
 732
 733 void wxGCDCImpl::DoDrawPolyPolygon(int n,
 734                                int count[],
 735                                wxPoint points[],
 736                                wxCoord xoffset,
 737                                wxCoord yoffset,
 738                                wxPolygonFillMode fillStyle)
 739 {
 740     wxASSERT(n > 1);
 741     wxGraphicsPath path = m_graphicContext->CreatePath();
 742
 743     int i = 0;
 744     for ( int j = 0; j < n; ++j)
 745     {
 746         wxPoint start = points[i];
 747         path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
 748         ++i;
 749         int l = count[j];
 750         for ( int k = 1; k < l; ++k)
 751         {
 752             path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
 753             ++i;
 754         }
 755         // close the polygon
 756         if ( start != points[i-1])
 757             path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
 758     }
 759     m_graphicContext->DrawPath( path , fillStyle);
 760 }
 761
 762 void wxGCDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 763 {
 764     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 765
 766     if ( !m_logicalFunctionSupported )
 767         return;
 768
 769     // CMB: draw nothing if transformed w or h is 0
 770     if (w == 0 || h == 0)
 771         return;
 772
 773     if ( m_graphicContext->ShouldOffset() )
 774     {
 775         // if we are offsetting the entire rectangle is moved 0.5, so the
 776         // border line gets off by 1
 777         w -= 1;
 778         h -= 1;
 779     }
 780     m_graphicContext->DrawRectangle(x,y,w,h);
 781 }
 782
 783 void wxGCDCImpl::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 784                                     wxCoord w, wxCoord h,
 785                                     double radius)
 786 {
 787     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 788
 789     if ( !m_logicalFunctionSupported )
 790         return;
 791
 792     if (radius < 0.0)
 793         radius = - radius * ((w < h) ? w : h);
 794
 795     // CMB: draw nothing if transformed w or h is 0
 796     if (w == 0 || h == 0)
 797         return;
 798
 799     if ( m_graphicContext->ShouldOffset() )
 800     {
 801         // if we are offsetting the entire rectangle is moved 0.5, so the
 802         // border line gets off by 1
 803         w -= 1;
 804         h -= 1;
 805     }
 806     m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
 807 }
 808
 809 void wxGCDCImpl::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 810 {
 811     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 812
 813     if ( !m_logicalFunctionSupported )
 814         return;
 815
 816     if ( m_graphicContext->ShouldOffset() )
 817     {
 818         // if we are offsetting the entire rectangle is moved 0.5, so the
 819         // border line gets off by 1
 820         w -= 1;
 821         h -= 1;
 822     }
 823     m_graphicContext->DrawEllipse(x,y,w,h);
 824 }
 825
 826 bool wxGCDCImpl::CanDrawBitmap() const
 827 {
 828     return true;
 829 }
 830
 831 bool wxGCDCImpl::DoBlit(
 832     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 833     wxDC *source, wxCoord xsrc, wxCoord ysrc,
 834     wxRasterOperationMode logical_func , bool useMask,
 835     wxCoord xsrcMask, wxCoord ysrcMask )
 836 {
 837     return DoStretchBlit( xdest, ydest, width, height,
 838         source, xsrc, ysrc, width, height, logical_func, useMask,
 839         xsrcMask,ysrcMask );
 840 }
 841
 842 bool wxGCDCImpl::DoStretchBlit(
 843     wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
 844     wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
 845     wxRasterOperationMode logical_func , bool useMask,
 846     wxCoord xsrcMask, wxCoord ysrcMask )
 847 {
 848     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
 849     wxCHECK_MSG( source->IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid source DC") );
 850
 851     if ( logical_func == wxNO_OP )
 852         return true;
 853
 854     wxCompositionMode mode = TranslateRasterOp(logical_func);
 855     if ( mode == wxCOMPOSITION_INVALID )
 856     {
 857         wxFAIL_MSG( wxT("Blitting is not supported with this logical operation.") );
 858         return false;
 859     }
 860
 861     wxRect subrect(source->LogicalToDeviceX(xsrc),
 862                    source->LogicalToDeviceY(ysrc),
 863                    source->LogicalToDeviceXRel(srcWidth),
 864                    source->LogicalToDeviceYRel(srcHeight));
 865     const wxRect subrectOrig = subrect;
 866     // clip the subrect down to the size of the source DC
 867     wxRect clip;
 868     source->GetSize(&clip.width, &clip.height);
 869     subrect.Intersect(clip);
 870     if (subrect.width == 0)
 871         return true;
 872
 873     bool retval = true;
 874
 875     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
 876     if (m_graphicContext->SetCompositionMode(mode))
 877     {
 878         wxAntialiasMode formerAa = m_graphicContext->GetAntialiasMode();
 879         if (mode == wxCOMPOSITION_XOR)
 880         {
 881             m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 882         }
 883
 884         if (xsrcMask == -1 && ysrcMask == -1)
 885         {
 886             xsrcMask = xsrc;
 887             ysrcMask = ysrc;
 888         }
 889
 890         wxBitmap blit = source->GetAsBitmap( &subrect );
 891
 892         if ( blit.IsOk() )
 893         {
 894             if ( !useMask && blit.GetMask() )
 895                 blit.SetMask(NULL);
 896
 897             double x = xdest;
 898             double y = ydest;
 899             double w = dstWidth;
 900             double h = dstHeight;
 901             // adjust dest rect if source rect is clipped
 902             if (subrect.width != subrectOrig.width || subrect.height != subrectOrig.height)
 903             {
 904                 x += (subrect.x - subrectOrig.x) / double(subrectOrig.width) * dstWidth;
 905                 y += (subrect.y - subrectOrig.y) / double(subrectOrig.height) * dstHeight;
 906                 w *= double(subrect.width) / subrectOrig.width;
 907                 h *= double(subrect.height) / subrectOrig.height;
 908             }
 909             m_graphicContext->DrawBitmap(blit, x, y, w, h);
 910         }
 911         else
 912         {
 913             wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
 914             retval = false;
 915         }
 916
 917         if (mode == wxCOMPOSITION_XOR)
 918         {
 919             m_graphicContext->SetAntialiasMode(formerAa);
 920         }
 921     }
 922     // reset composition
 923     m_graphicContext->SetCompositionMode(formerMode);
 924
 925     return retval;
 926 }
 927
 928 void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 929                                double angle)
 930 {
 931     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 932
 933     if ( str.empty() )
 934         return;
 935     if ( !m_logicalFunctionSupported )
 936         return;
 937
 938     if ( m_backgroundMode == wxTRANSPARENT )
 939         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 940     else
 941         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ), m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 942 }
 943
 944 void wxGCDCImpl::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 945 {
 946     // For compatibility with other ports (notably wxGTK) and because it's
 947     // genuinely useful, we allow passing multiline strings to DrawText().
 948     // However there is no native OSX function to draw them directly so we
 949     // instead reuse the generic DrawLabel() method to render them. Of course,
 950     // DrawLabel() itself will call back to us but with single line strings
 951     // only so there won't be any infinite recursion here.
 952     if ( str.find('\n') != wxString::npos )
 953     {
 954         GetOwner()->DrawLabel(str, wxRect(x, y, 0, 0));
 955         return;
 956     }
 957
 958     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawText - invalid DC") );
 959
 960     if ( str.empty() )
 961         return;
 962
 963     if ( !m_logicalFunctionSupported )
 964         return;
 965
 966     if ( m_backgroundMode == wxTRANSPARENT )
 967         m_graphicContext->DrawText( str, x ,y);
 968     else
 969         m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 970 }
 971
 972 bool wxGCDCImpl::CanGetTextExtent() const
 973 {
 974     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 975
 976     return true;
 977 }
 978
 979 void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
 980                               wxCoord *descent, wxCoord *externalLeading ,
 981                               const wxFont *theFont ) const
 982 {
 983     wxCHECK_RET( m_graphicContext, wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 984
 985     if ( theFont )
 986     {
 987         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
 988     }
 989
 990     wxDouble h , d , e , w;
 991
 992     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
 993
 994     if ( height )
 995         *height = (wxCoord)(h+0.5);
 996     if ( descent )
 997         *descent = (wxCoord)(d+0.5);
 998     if ( externalLeading )
 999         *externalLeading = (wxCoord)(e+0.5);
1000     if ( width )
1001         *width = (wxCoord)(w+0.5);
1002
1003     if ( theFont )
1004     {
1005         m_graphicContext->SetFont( m_font, m_textForegroundColour );
1006     }
1007 }
1008
1009 bool wxGCDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
1010 {
1011     wxCHECK_MSG( m_graphicContext, false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
1012     widths.Clear();
1013     widths.Add(0,text.Length());
1014     if ( text.IsEmpty() )
1015         return true;
1016
1017     wxArrayDouble widthsD;
1018
1019     m_graphicContext->GetPartialTextExtents( text, widthsD );
1020     for ( size_t i = 0; i < widths.GetCount(); ++i )
1021         widths[i] = (wxCoord)(widthsD[i] + 0.5);
1022
1023     return true;
1024 }
1025
1026 wxCoord wxGCDCImpl::GetCharWidth(void) const
1027 {
1028     wxCoord width;
1029     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
1030
1031     return width;
1032 }
1033
1034 wxCoord wxGCDCImpl::GetCharHeight(void) const
1035 {
1036     wxCoord height;
1037     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
1038
1039     return height;
1040 }
1041
1042 void wxGCDCImpl::Clear(void)
1043 {
1044     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::Clear - invalid DC") );
1045     // TODO better implementation / incorporate size info into wxGCDC or context
1046     m_graphicContext->SetBrush( m_backgroundBrush );
1047     wxPen p = *wxTRANSPARENT_PEN;
1048     m_graphicContext->SetPen( p );
1049     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
1050     m_graphicContext->SetCompositionMode(wxCOMPOSITION_SOURCE);
1051     DoDrawRectangle( 0, 0, 32000 , 32000 );
1052     m_graphicContext->SetCompositionMode(formerMode);
1053     m_graphicContext->SetPen( m_pen );
1054     m_graphicContext->SetBrush( m_brush );
1055 }
1056
1057 void wxGCDCImpl::DoGetSize(int *width, int *height) const
1058 {
1059     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetSize - invalid DC") );
1060     wxDouble w,h;
1061     m_graphicContext->GetSize( &w, &h );
1062     if ( height )
1063         *height = (int) (h+0.5);
1064     if ( width )
1065         *width = (int) (w+0.5);
1066 }
1067
1068 void wxGCDCImpl::DoGradientFillLinear(const wxRect& rect,
1069                                   const wxColour& initialColour,
1070                                   const wxColour& destColour,
1071                                   wxDirection nDirection )
1072 {
1073     wxPoint start;
1074     wxPoint end;
1075     switch( nDirection)
1076     {
1077     case wxWEST :
1078         start = rect.GetRightBottom();
1079         start.x++;
1080         end = rect.GetLeftBottom();
1081         break;
1082     case wxEAST :
1083         start = rect.GetLeftBottom();
1084         end = rect.GetRightBottom();
1085         end.x++;
1086         break;
1087     case wxNORTH :
1088         start = rect.GetLeftBottom();
1089         start.y++;
1090         end = rect.GetLeftTop();
1091         break;
1092     case wxSOUTH :
1093         start = rect.GetLeftTop();
1094         end = rect.GetLeftBottom();
1095         end.y++;
1096         break;
1097     default :
1098         break;
1099     }
1100
1101     if (rect.width == 0 || rect.height == 0)
1102         return;
1103
1104     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
1105         start.x,start.y,end.x,end.y, initialColour, destColour));
1106     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1107     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1108     m_graphicContext->SetPen(m_pen);
1109     m_graphicContext->SetBrush(m_brush);
1110 }
1111
1112 void wxGCDCImpl::DoGradientFillConcentric(const wxRect& rect,
1113                                       const wxColour& initialColour,
1114                                       const wxColour& destColour,
1115                                       const wxPoint& circleCenter)
1116 {
1117     //Radius
1118     wxInt32 cx = rect.GetWidth() / 2;
1119     wxInt32 cy = rect.GetHeight() / 2;
1120     wxInt32 nRadius;
1121     if (cx < cy)
1122         nRadius = cx;
1123     else
1124         nRadius = cy;
1125
1126     // make sure the background is filled (todo move into specific platform implementation ?)
1127     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1128     m_graphicContext->SetBrush( wxBrush( destColour) );
1129     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1130
1131     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
1132         rect.x+circleCenter.x,rect.y+circleCenter.y,
1133         rect.x+circleCenter.x,rect.y+circleCenter.y,
1134         nRadius,initialColour,destColour));
1135
1136     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1137     m_graphicContext->SetPen(m_pen);
1138     m_graphicContext->SetBrush(m_brush);
1139 }
1140
1141 void wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
1142                              wxCoord width, wxCoord height)
1143 {
1144     wxDCImpl::DoDrawCheckMark(x,y,width,height);
1145 }
1146
1147 #ifdef __WXMSW__
1148 wxRect wxGCDCImpl::MSWApplyGDIPlusTransform(const wxRect& r) const
1149 {
1150     wxGraphicsContext* const gc = GetGraphicsContext();
1151     wxCHECK_MSG( gc, r, wxT("Invalid wxGCDC") );
1152
1153     double x = 0,
1154            y = 0;
1155     gc->GetTransform().TransformPoint(&x, &y);
1156
1157     wxRect rect(r);
1158     rect.Offset(x, y);
1159
1160     return rect;
1161 }
1162 #endif // __WXMSW__
1163
1164 #endif // wxUSE_GRAPHICS_CONTEXT