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::SetPalette( const wxPalette& WXUNUSED(palette) )
 437 {
 438
 439 }
 440
 441 void wxGCDCImpl::SetBackgroundMode( int mode )
 442 {
 443     m_backgroundMode = mode;
 444 }
 445
 446 void wxGCDCImpl::SetFont( const wxFont &font )
 447 {
 448     m_font = font;
 449     if ( m_graphicContext )
 450     {
 451         m_graphicContext->SetFont(font, m_textForegroundColour);
 452     }
 453 }
 454
 455 void wxGCDCImpl::SetPen( const wxPen &pen )
 456 {
 457     m_pen = pen;
 458     if ( m_graphicContext )
 459     {
 460         m_graphicContext->SetPen( m_pen );
 461     }
 462 }
 463
 464 void wxGCDCImpl::SetBrush( const wxBrush &brush )
 465 {
 466     m_brush = brush;
 467     if ( m_graphicContext )
 468     {
 469         m_graphicContext->SetBrush( m_brush );
 470     }
 471 }
 472
 473 void wxGCDCImpl::SetBackground( const wxBrush &brush )
 474 {
 475     m_backgroundBrush = brush;
 476     if (!m_backgroundBrush.IsOk())
 477         return;
 478 }
 479
 480 void wxGCDCImpl::SetLogicalFunction( wxRasterOperationMode function )
 481 {
 482     m_logicalFunction = function;
 483
 484     wxCompositionMode mode = TranslateRasterOp( function );
 485     m_logicalFunctionSupported = mode != wxCOMPOSITION_INVALID;
 486     if (m_logicalFunctionSupported)
 487         m_logicalFunctionSupported = m_graphicContext->SetCompositionMode(mode);
 488
 489     if ( function == wxXOR )
 490         m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 491     else
 492         m_graphicContext->SetAntialiasMode(wxANTIALIAS_DEFAULT);
 493 }
 494
 495 bool wxGCDCImpl::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 496                              const wxColour& WXUNUSED(col),
 497                              wxFloodFillStyle WXUNUSED(style))
 498 {
 499     return false;
 500 }
 501
 502 bool wxGCDCImpl::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 503 {
 504     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 505     return false;
 506 }
 507
 508 void wxGCDCImpl::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 509 {
 510     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 511
 512     if ( !m_logicalFunctionSupported )
 513         return;
 514
 515     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 516
 517     CalcBoundingBox(x1, y1);
 518     CalcBoundingBox(x2, y2);
 519 }
 520
 521 void wxGCDCImpl::DoCrossHair( wxCoord x, wxCoord y )
 522 {
 523     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 524
 525     if ( !m_logicalFunctionSupported )
 526         return;
 527
 528     int w = 0, h = 0;
 529
 530     GetOwner()->GetSize( &w, &h );
 531
 532     m_graphicContext->StrokeLine(0,y,w,y);
 533     m_graphicContext->StrokeLine(x,0,x,h);
 534
 535     CalcBoundingBox(0, 0);
 536     CalcBoundingBox(0+w, 0+h);
 537 }
 538
 539 void wxGCDCImpl::DoDrawArc( wxCoord x1, wxCoord y1,
 540                         wxCoord x2, wxCoord y2,
 541                         wxCoord xc, wxCoord yc )
 542 {
 543     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 544
 545     if ( !m_logicalFunctionSupported )
 546         return;
 547
 548     double dx = x1 - xc;
 549     double dy = y1 - yc;
 550     double radius = sqrt((double)(dx * dx + dy * dy));
 551     wxCoord rad = (wxCoord)radius;
 552     double sa, ea;
 553     if (x1 == x2 && y1 == y2)
 554     {
 555         sa = 0.0;
 556         ea = 360.0;
 557     }
 558     else if (radius == 0.0)
 559     {
 560         sa = ea = 0.0;
 561     }
 562     else
 563     {
 564         sa = (x1 - xc == 0) ?
 565      (y1 - yc < 0) ? 90.0 : -90.0 :
 566              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 567         ea = (x2 - xc == 0) ?
 568      (y2 - yc < 0) ? 90.0 : -90.0 :
 569              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 570     }
 571
 572     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 573
 574     wxGraphicsPath path = m_graphicContext->CreatePath();
 575     if ( fill && ((x1!=x2)||(y1!=y2)) )
 576         path.MoveToPoint( xc, yc );
 577     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 578     // get clockwise angles
 579     path.AddArc( xc, yc , rad , DegToRad(-sa) , DegToRad(-ea), false );
 580     if ( fill && ((x1!=x2)||(y1!=y2)) )
 581         path.AddLineToPoint( xc, yc );
 582     m_graphicContext->DrawPath(path);
 583 }
 584
 585 void wxGCDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 586                                 double sa, double ea )
 587 {
 588     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 589
 590     if ( !m_logicalFunctionSupported )
 591         return;
 592
 593     m_graphicContext->PushState();
 594     m_graphicContext->Translate(x+w/2.0,y+h/2.0);
 595     wxDouble factor = ((wxDouble) w) / h;
 596     m_graphicContext->Scale( factor , 1.0);
 597
 598     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 599     // get clockwise angles
 600     if ( m_brush.GetStyle() != wxTRANSPARENT )
 601     {
 602         wxGraphicsPath path = m_graphicContext->CreatePath();
 603         path.MoveToPoint( 0, 0 );
 604         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 605         path.AddLineToPoint( 0, 0 );
 606         m_graphicContext->FillPath( path );
 607
 608         path = m_graphicContext->CreatePath();
 609         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 610         m_graphicContext->StrokePath( path );
 611     }
 612     else
 613     {
 614         wxGraphicsPath path = m_graphicContext->CreatePath();
 615         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 616         m_graphicContext->DrawPath( path );
 617     }
 618
 619     m_graphicContext->PopState();
 620 }
 621
 622 void wxGCDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
 623 {
 624     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 625
 626     DoDrawLine( x , y , x + 1 , y + 1 );
 627 }
 628
 629 void wxGCDCImpl::DoDrawLines(int n, wxPoint points[],
 630                          wxCoord xoffset, wxCoord yoffset)
 631 {
 632     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 633
 634     if ( !m_logicalFunctionSupported )
 635         return;
 636
 637     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 638     for( int i = 0; i < n; ++i)
 639     {
 640         pointsD[i].m_x = points[i].x + xoffset;
 641         pointsD[i].m_y = points[i].y + yoffset;
 642     }
 643
 644     m_graphicContext->StrokeLines( n , pointsD);
 645     delete[] pointsD;
 646 }
 647
 648 #if wxUSE_SPLINES
 649 void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
 650 {
 651     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 652
 653     if ( !m_logicalFunctionSupported )
 654         return;
 655
 656     wxGraphicsPath path = m_graphicContext->CreatePath();
 657
 658     wxPointList::compatibility_iterator node = points->GetFirst();
 659     if ( !node )
 660         // empty list
 661         return;
 662
 663     wxPoint *p = node->GetData();
 664
 665     wxCoord x1 = p->x;
 666     wxCoord y1 = p->y;
 667
 668     node = node->GetNext();
 669     p = node->GetData();
 670
 671     wxCoord x2 = p->x;
 672     wxCoord y2 = p->y;
 673     wxCoord cx1 = ( x1 + x2 ) / 2;
 674     wxCoord cy1 = ( y1 + y2 ) / 2;
 675
 676     path.MoveToPoint( x1 , y1 );
 677     path.AddLineToPoint( cx1 , cy1 );
 678 #if !wxUSE_STD_CONTAINERS
 679
 680     while ((node = node->GetNext()) != NULL)
 681 #else
 682
 683     while ((node = node->GetNext()))
 684 #endif // !wxUSE_STD_CONTAINERS
 685
 686     {
 687         p = node->GetData();
 688         x1 = x2;
 689         y1 = y2;
 690         x2 = p->x;
 691         y2 = p->y;
 692         wxCoord cx4 = (x1 + x2) / 2;
 693         wxCoord cy4 = (y1 + y2) / 2;
 694
 695         path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 696
 697         cx1 = cx4;
 698         cy1 = cy4;
 699     }
 700
 701     path.AddLineToPoint( x2 , y2 );
 702
 703     m_graphicContext->StrokePath( path );
 704 }
 705 #endif // wxUSE_SPLINES
 706
 707 void wxGCDCImpl::DoDrawPolygon( int n, wxPoint points[],
 708                                 wxCoord xoffset, wxCoord yoffset,
 709                                 wxPolygonFillMode fillStyle )
 710 {
 711     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 712
 713     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 714         return;
 715     if ( !m_logicalFunctionSupported )
 716         return;
 717
 718     bool closeIt = false;
 719     if (points[n-1] != points[0])
 720         closeIt = true;
 721
 722     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 723     for( int i = 0; i < n; ++i)
 724     {
 725         pointsD[i].m_x = points[i].x + xoffset;
 726         pointsD[i].m_y = points[i].y + yoffset;
 727     }
 728     if ( closeIt )
 729         pointsD[n] = pointsD[0];
 730
 731     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 732     delete[] pointsD;
 733 }
 734
 735 void wxGCDCImpl::DoDrawPolyPolygon(int n,
 736                                int count[],
 737                                wxPoint points[],
 738                                wxCoord xoffset,
 739                                wxCoord yoffset,
 740                                wxPolygonFillMode fillStyle)
 741 {
 742     wxASSERT(n > 1);
 743     wxGraphicsPath path = m_graphicContext->CreatePath();
 744
 745     int i = 0;
 746     for ( int j = 0; j < n; ++j)
 747     {
 748         wxPoint start = points[i];
 749         path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
 750         ++i;
 751         int l = count[j];
 752         for ( int k = 1; k < l; ++k)
 753         {
 754             path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
 755             ++i;
 756         }
 757         // close the polygon
 758         if ( start != points[i-1])
 759             path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
 760     }
 761     m_graphicContext->DrawPath( path , fillStyle);
 762 }
 763
 764 void wxGCDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 765 {
 766     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 767
 768     if ( !m_logicalFunctionSupported )
 769         return;
 770
 771     // CMB: draw nothing if transformed w or h is 0
 772     if (w == 0 || h == 0)
 773         return;
 774
 775     if ( m_graphicContext->ShouldOffset() )
 776     {
 777         // if we are offsetting the entire rectangle is moved 0.5, so the
 778         // border line gets off by 1
 779         w -= 1;
 780         h -= 1;
 781     }
 782     m_graphicContext->DrawRectangle(x,y,w,h);
 783 }
 784
 785 void wxGCDCImpl::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 786                                     wxCoord w, wxCoord h,
 787                                     double radius)
 788 {
 789     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 790
 791     if ( !m_logicalFunctionSupported )
 792         return;
 793
 794     if (radius < 0.0)
 795         radius = - radius * ((w < h) ? w : h);
 796
 797     // CMB: draw nothing if transformed w or h is 0
 798     if (w == 0 || h == 0)
 799         return;
 800
 801     if ( m_graphicContext->ShouldOffset() )
 802     {
 803         // if we are offsetting the entire rectangle is moved 0.5, so the
 804         // border line gets off by 1
 805         w -= 1;
 806         h -= 1;
 807     }
 808     m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
 809 }
 810
 811 void wxGCDCImpl::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 812 {
 813     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 814
 815     if ( !m_logicalFunctionSupported )
 816         return;
 817
 818     if ( m_graphicContext->ShouldOffset() )
 819     {
 820         // if we are offsetting the entire rectangle is moved 0.5, so the
 821         // border line gets off by 1
 822         w -= 1;
 823         h -= 1;
 824     }
 825     m_graphicContext->DrawEllipse(x,y,w,h);
 826 }
 827
 828 bool wxGCDCImpl::CanDrawBitmap() const
 829 {
 830     return true;
 831 }
 832
 833 bool wxGCDCImpl::DoBlit(
 834     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 835     wxDC *source, wxCoord xsrc, wxCoord ysrc,
 836     wxRasterOperationMode logical_func , bool useMask,
 837     wxCoord xsrcMask, wxCoord ysrcMask )
 838 {
 839     return DoStretchBlit( xdest, ydest, width, height,
 840         source, xsrc, ysrc, width, height, logical_func, useMask,
 841         xsrcMask,ysrcMask );
 842 }
 843
 844 bool wxGCDCImpl::DoStretchBlit(
 845     wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
 846     wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
 847     wxRasterOperationMode logical_func , bool useMask,
 848     wxCoord xsrcMask, wxCoord ysrcMask )
 849 {
 850     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
 851     wxCHECK_MSG( source->IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid source DC") );
 852
 853     if ( logical_func == wxNO_OP )
 854         return true;
 855
 856     wxCompositionMode mode = TranslateRasterOp(logical_func);
 857     if ( mode == wxCOMPOSITION_INVALID )
 858     {
 859         wxFAIL_MSG( wxT("Blitting is not supported with this logical operation.") );
 860         return false;
 861     }
 862
 863     wxRect subrect(source->LogicalToDeviceX(xsrc),
 864                    source->LogicalToDeviceY(ysrc),
 865                    source->LogicalToDeviceXRel(srcWidth),
 866                    source->LogicalToDeviceYRel(srcHeight));
 867     const wxRect subrectOrig = subrect;
 868     // clip the subrect down to the size of the source DC
 869     wxRect clip;
 870     source->GetSize(&clip.width, &clip.height);
 871     subrect.Intersect(clip);
 872     if (subrect.width == 0)
 873         return true;
 874
 875     bool retval = true;
 876
 877     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
 878     if (m_graphicContext->SetCompositionMode(mode))
 879     {
 880         wxAntialiasMode formerAa = m_graphicContext->GetAntialiasMode();
 881         if (mode == wxCOMPOSITION_XOR)
 882         {
 883             m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 884         }
 885
 886         if (xsrcMask == -1 && ysrcMask == -1)
 887         {
 888             xsrcMask = xsrc;
 889             ysrcMask = ysrc;
 890         }
 891
 892         wxBitmap blit = source->GetAsBitmap( &subrect );
 893
 894         if ( blit.IsOk() )
 895         {
 896             if ( !useMask && blit.GetMask() )
 897                 blit.SetMask(NULL);
 898
 899             double x = xdest;
 900             double y = ydest;
 901             double w = dstWidth;
 902             double h = dstHeight;
 903             // adjust dest rect if source rect is clipped
 904             if (subrect.width != subrectOrig.width || subrect.height != subrectOrig.height)
 905             {
 906                 x += (subrect.x - subrectOrig.x) / double(subrectOrig.width) * dstWidth;
 907                 y += (subrect.y - subrectOrig.y) / double(subrectOrig.height) * dstHeight;
 908                 w *= double(subrect.width) / subrectOrig.width;
 909                 h *= double(subrect.height) / subrectOrig.height;
 910             }
 911             m_graphicContext->DrawBitmap(blit, x, y, w, h);
 912         }
 913         else
 914         {
 915             wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
 916             retval = false;
 917         }
 918
 919         if (mode == wxCOMPOSITION_XOR)
 920         {
 921             m_graphicContext->SetAntialiasMode(formerAa);
 922         }
 923     }
 924     // reset composition
 925     m_graphicContext->SetCompositionMode(formerMode);
 926
 927     return retval;
 928 }
 929
 930 void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 931                                double angle)
 932 {
 933     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 934
 935     if ( str.empty() )
 936         return;
 937     if ( !m_logicalFunctionSupported )
 938         return;
 939
 940     if ( m_backgroundMode == wxTRANSPARENT )
 941         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 942     else
 943         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ), m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 944 }
 945
 946 void wxGCDCImpl::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 947 {
 948     // For compatibility with other ports (notably wxGTK) and because it's
 949     // genuinely useful, we allow passing multiline strings to DrawText().
 950     // However there is no native OSX function to draw them directly so we
 951     // instead reuse the generic DrawLabel() method to render them. Of course,
 952     // DrawLabel() itself will call back to us but with single line strings
 953     // only so there won't be any infinite recursion here.
 954     if ( str.find('\n') != wxString::npos )
 955     {
 956         GetOwner()->DrawLabel(str, wxRect(x, y, 0, 0));
 957         return;
 958     }
 959
 960     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawText - invalid DC") );
 961
 962     if ( str.empty() )
 963         return;
 964
 965     if ( !m_logicalFunctionSupported )
 966         return;
 967
 968     if ( m_backgroundMode == wxTRANSPARENT )
 969         m_graphicContext->DrawText( str, x ,y);
 970     else
 971         m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 972 }
 973
 974 bool wxGCDCImpl::CanGetTextExtent() const
 975 {
 976     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 977
 978     return true;
 979 }
 980
 981 void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
 982                               wxCoord *descent, wxCoord *externalLeading ,
 983                               const wxFont *theFont ) const
 984 {
 985     wxCHECK_RET( m_graphicContext, wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 986
 987     if ( theFont )
 988     {
 989         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
 990     }
 991
 992     wxDouble h , d , e , w;
 993
 994     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
 995
 996     if ( height )
 997         *height = (wxCoord)(h+0.5);
 998     if ( descent )
 999         *descent = (wxCoord)(d+0.5);
1000     if ( externalLeading )
1001         *externalLeading = (wxCoord)(e+0.5);
1002     if ( width )
1003         *width = (wxCoord)(w+0.5);
1004
1005     if ( theFont )
1006     {
1007         m_graphicContext->SetFont( m_font, m_textForegroundColour );
1008     }
1009 }
1010
1011 bool wxGCDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
1012 {
1013     wxCHECK_MSG( m_graphicContext, false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
1014     widths.Clear();
1015     widths.Add(0,text.Length());
1016     if ( text.IsEmpty() )
1017         return true;
1018
1019     wxArrayDouble widthsD;
1020
1021     m_graphicContext->GetPartialTextExtents( text, widthsD );
1022     for ( size_t i = 0; i < widths.GetCount(); ++i )
1023         widths[i] = (wxCoord)(widthsD[i] + 0.5);
1024
1025     return true;
1026 }
1027
1028 wxCoord wxGCDCImpl::GetCharWidth(void) const
1029 {
1030     wxCoord width;
1031     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
1032
1033     return width;
1034 }
1035
1036 wxCoord wxGCDCImpl::GetCharHeight(void) const
1037 {
1038     wxCoord height;
1039     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
1040
1041     return height;
1042 }
1043
1044 void wxGCDCImpl::Clear(void)
1045 {
1046     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::Clear - invalid DC") );
1047     // TODO better implementation / incorporate size info into wxGCDC or context
1048     m_graphicContext->SetBrush( m_backgroundBrush );
1049     wxPen p = *wxTRANSPARENT_PEN;
1050     m_graphicContext->SetPen( p );
1051     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
1052     m_graphicContext->SetCompositionMode(wxCOMPOSITION_SOURCE);
1053     DoDrawRectangle( 0, 0, INT_MAX , INT_MAX );
1054     m_graphicContext->SetCompositionMode(formerMode);
1055     m_graphicContext->SetPen( m_pen );
1056     m_graphicContext->SetBrush( m_brush );
1057 }
1058
1059 void wxGCDCImpl::DoGetSize(int *width, int *height) const
1060 {
1061     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetSize - invalid DC") );
1062     wxDouble w,h;
1063     m_graphicContext->GetSize( &w, &h );
1064     if ( height )
1065         *height = (int) (h+0.5);
1066     if ( width )
1067         *width = (int) (w+0.5);
1068 }
1069
1070 void wxGCDCImpl::DoGradientFillLinear(const wxRect& rect,
1071                                   const wxColour& initialColour,
1072                                   const wxColour& destColour,
1073                                   wxDirection nDirection )
1074 {
1075     wxPoint start;
1076     wxPoint end;
1077     switch( nDirection)
1078     {
1079     case wxWEST :
1080         start = rect.GetRightBottom();
1081         start.x++;
1082         end = rect.GetLeftBottom();
1083         break;
1084     case wxEAST :
1085         start = rect.GetLeftBottom();
1086         end = rect.GetRightBottom();
1087         end.x++;
1088         break;
1089     case wxNORTH :
1090         start = rect.GetLeftBottom();
1091         start.y++;
1092         end = rect.GetLeftTop();
1093         break;
1094     case wxSOUTH :
1095         start = rect.GetLeftTop();
1096         end = rect.GetLeftBottom();
1097         end.y++;
1098         break;
1099     default :
1100         break;
1101     }
1102
1103     if (rect.width == 0 || rect.height == 0)
1104         return;
1105
1106     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
1107         start.x,start.y,end.x,end.y, initialColour, destColour));
1108     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1109     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1110     m_graphicContext->SetPen(m_pen);
1111     m_graphicContext->SetBrush(m_brush);
1112 }
1113
1114 void wxGCDCImpl::DoGradientFillConcentric(const wxRect& rect,
1115                                       const wxColour& initialColour,
1116                                       const wxColour& destColour,
1117                                       const wxPoint& circleCenter)
1118 {
1119     //Radius
1120     wxInt32 cx = rect.GetWidth() / 2;
1121     wxInt32 cy = rect.GetHeight() / 2;
1122     wxInt32 nRadius;
1123     if (cx < cy)
1124         nRadius = cx;
1125     else
1126         nRadius = cy;
1127
1128     // make sure the background is filled (todo move into specific platform implementation ?)
1129     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1130     m_graphicContext->SetBrush( wxBrush( destColour) );
1131     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1132
1133     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
1134         rect.x+circleCenter.x,rect.y+circleCenter.y,
1135         rect.x+circleCenter.x,rect.y+circleCenter.y,
1136         nRadius,initialColour,destColour));
1137
1138     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1139     m_graphicContext->SetPen(m_pen);
1140     m_graphicContext->SetBrush(m_brush);
1141 }
1142
1143 void wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
1144                              wxCoord width, wxCoord height)
1145 {
1146     wxDCImpl::DoDrawCheckMark(x,y,width,height);
1147 }
1148
1149 #ifdef __WXMSW__
1150 wxRect wxGCDCImpl::MSWApplyGDIPlusTransform(const wxRect& r) const
1151 {
1152     wxGraphicsContext* const gc = GetGraphicsContext();
1153     wxCHECK_MSG( gc, r, wxT("Invalid wxGCDC") );
1154
1155     double x = 0,
1156            y = 0;
1157     gc->GetTransform().TransformPoint(&x, &y);
1158
1159     wxRect rect(r);
1160     rect.Offset(x, y);
1161
1162     return rect;
1163 }
1164 #endif // __WXMSW__
1165
1166 #endif // wxUSE_GRAPHICS_CONTEXT