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 void wxGCDCImpl::SetMapMode( wxMappingMode mode )
 403 {
 404     switch (mode)
 405     {
 406     case wxMM_TWIPS:
 407         SetLogicalScale( twips2mm * m_mm_to_pix_x, twips2mm * m_mm_to_pix_y );
 408         break;
 409
 410     case wxMM_POINTS:
 411         SetLogicalScale( pt2mm * m_mm_to_pix_x, pt2mm * m_mm_to_pix_y );
 412         break;
 413
 414     case wxMM_METRIC:
 415         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 416         break;
 417
 418     case wxMM_LOMETRIC:
 419         SetLogicalScale( m_mm_to_pix_x / 10.0, m_mm_to_pix_y / 10.0 );
 420         break;
 421
 422     case wxMM_TEXT:
 423     default:
 424         SetLogicalScale( 1.0, 1.0 );
 425         break;
 426     }
 427
 428     ComputeScaleAndOrigin();
 429 }
 430
 431 wxSize wxGCDCImpl::GetPPI() const
 432 {
 433     return wxSize(72, 72);
 434 }
 435
 436 int wxGCDCImpl::GetDepth() const
 437 {
 438     return 32;
 439 }
 440
 441 void wxGCDCImpl::ComputeScaleAndOrigin()
 442 {
 443     wxDCImpl::ComputeScaleAndOrigin();
 444
 445     if ( m_graphicContext )
 446     {
 447         m_matrixCurrent = m_graphicContext->CreateMatrix();
 448
 449         // the logical origin sets the origin to have new coordinates
 450         m_matrixCurrent.Translate( m_deviceOriginX - m_logicalOriginX * m_signX * m_scaleX,
 451                                    m_deviceOriginY-m_logicalOriginY * m_signY * m_scaleY);
 452
 453         m_matrixCurrent.Scale( m_scaleX * m_signX, m_scaleY * m_signY );
 454
 455         m_graphicContext->SetTransform( m_matrixOriginal );
 456         m_graphicContext->ConcatTransform( m_matrixCurrent );
 457     }
 458 }
 459
 460 void wxGCDCImpl::SetPalette( const wxPalette& WXUNUSED(palette) )
 461 {
 462
 463 }
 464
 465 void wxGCDCImpl::SetBackgroundMode( int mode )
 466 {
 467     m_backgroundMode = mode;
 468 }
 469
 470 void wxGCDCImpl::SetFont( const wxFont &font )
 471 {
 472     m_font = font;
 473     if ( m_graphicContext )
 474     {
 475         wxFont f = font;
 476         if ( f.IsOk() )
 477             f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
 478         m_graphicContext->SetFont( f, m_textForegroundColour );
 479     }
 480 }
 481
 482 void wxGCDCImpl::SetPen( const wxPen &pen )
 483 {
 484     m_pen = pen;
 485     if ( m_graphicContext )
 486     {
 487         m_graphicContext->SetPen( m_pen );
 488     }
 489 }
 490
 491 void wxGCDCImpl::SetBrush( const wxBrush &brush )
 492 {
 493     m_brush = brush;
 494     if ( m_graphicContext )
 495     {
 496         m_graphicContext->SetBrush( m_brush );
 497     }
 498 }
 499
 500 void wxGCDCImpl::SetBackground( const wxBrush &brush )
 501 {
 502     m_backgroundBrush = brush;
 503     if (!m_backgroundBrush.IsOk())
 504         return;
 505 }
 506
 507 void wxGCDCImpl::SetLogicalFunction( wxRasterOperationMode function )
 508 {
 509     m_logicalFunction = function;
 510
 511     wxCompositionMode mode = TranslateRasterOp( function );
 512     m_logicalFunctionSupported = mode != wxCOMPOSITION_INVALID;
 513     if (m_logicalFunctionSupported)
 514         m_logicalFunctionSupported = m_graphicContext->SetCompositionMode(mode);
 515
 516     if ( function == wxXOR )
 517         m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 518     else
 519         m_graphicContext->SetAntialiasMode(wxANTIALIAS_DEFAULT);
 520 }
 521
 522 bool wxGCDCImpl::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 523                              const wxColour& WXUNUSED(col),
 524                              wxFloodFillStyle WXUNUSED(style))
 525 {
 526     return false;
 527 }
 528
 529 bool wxGCDCImpl::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 530 {
 531     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 532     return false;
 533 }
 534
 535 void wxGCDCImpl::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 536 {
 537     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 538
 539     if ( !m_logicalFunctionSupported )
 540         return;
 541
 542     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 543
 544     CalcBoundingBox(x1, y1);
 545     CalcBoundingBox(x2, y2);
 546 }
 547
 548 void wxGCDCImpl::DoCrossHair( wxCoord x, wxCoord y )
 549 {
 550     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 551
 552     if ( !m_logicalFunctionSupported )
 553         return;
 554
 555     int w = 0, h = 0;
 556
 557     GetOwner()->GetSize( &w, &h );
 558
 559     m_graphicContext->StrokeLine(0,y,w,y);
 560     m_graphicContext->StrokeLine(x,0,x,h);
 561
 562     CalcBoundingBox(0, 0);
 563     CalcBoundingBox(0+w, 0+h);
 564 }
 565
 566 void wxGCDCImpl::DoDrawArc( wxCoord x1, wxCoord y1,
 567                         wxCoord x2, wxCoord y2,
 568                         wxCoord xc, wxCoord yc )
 569 {
 570     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 571
 572     if ( !m_logicalFunctionSupported )
 573         return;
 574
 575     double dx = x1 - xc;
 576     double dy = y1 - yc;
 577     double radius = sqrt((double)(dx * dx + dy * dy));
 578     wxCoord rad = (wxCoord)radius;
 579     double sa, ea;
 580     if (x1 == x2 && y1 == y2)
 581     {
 582         sa = 0.0;
 583         ea = 360.0;
 584     }
 585     else if (radius == 0.0)
 586     {
 587         sa = ea = 0.0;
 588     }
 589     else
 590     {
 591         sa = (x1 - xc == 0) ?
 592      (y1 - yc < 0) ? 90.0 : -90.0 :
 593              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 594         ea = (x2 - xc == 0) ?
 595      (y2 - yc < 0) ? 90.0 : -90.0 :
 596              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 597     }
 598
 599     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 600
 601     wxGraphicsPath path = m_graphicContext->CreatePath();
 602     if ( fill && ((x1!=x2)||(y1!=y2)) )
 603         path.MoveToPoint( xc, yc );
 604     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 605     // get clockwise angles
 606     path.AddArc( xc, yc , rad , DegToRad(-sa) , DegToRad(-ea), false );
 607     if ( fill && ((x1!=x2)||(y1!=y2)) )
 608         path.AddLineToPoint( xc, yc );
 609     m_graphicContext->DrawPath(path);
 610 }
 611
 612 void wxGCDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 613                                 double sa, double ea )
 614 {
 615     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 616
 617     if ( !m_logicalFunctionSupported )
 618         return;
 619
 620     m_graphicContext->PushState();
 621     m_graphicContext->Translate(x+w/2.0,y+h/2.0);
 622     wxDouble factor = ((wxDouble) w) / h;
 623     m_graphicContext->Scale( factor , 1.0);
 624
 625     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 626     // get clockwise angles
 627     if ( m_brush.GetStyle() != wxTRANSPARENT )
 628     {
 629         wxGraphicsPath path = m_graphicContext->CreatePath();
 630         path.MoveToPoint( 0, 0 );
 631         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 632         path.AddLineToPoint( 0, 0 );
 633         m_graphicContext->FillPath( path );
 634
 635         path = m_graphicContext->CreatePath();
 636         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 637         m_graphicContext->StrokePath( path );
 638     }
 639     else
 640     {
 641         wxGraphicsPath path = m_graphicContext->CreatePath();
 642         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 643         m_graphicContext->DrawPath( path );
 644     }
 645
 646     m_graphicContext->PopState();
 647 }
 648
 649 void wxGCDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
 650 {
 651     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 652
 653     DoDrawLine( x , y , x + 1 , y + 1 );
 654 }
 655
 656 void wxGCDCImpl::DoDrawLines(int n, wxPoint points[],
 657                          wxCoord xoffset, wxCoord yoffset)
 658 {
 659     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 660
 661     if ( !m_logicalFunctionSupported )
 662         return;
 663
 664     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 665     for( int i = 0; i < n; ++i)
 666     {
 667         pointsD[i].m_x = points[i].x + xoffset;
 668         pointsD[i].m_y = points[i].y + yoffset;
 669     }
 670
 671     m_graphicContext->StrokeLines( n , pointsD);
 672     delete[] pointsD;
 673 }
 674
 675 #if wxUSE_SPLINES
 676 void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
 677 {
 678     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 679
 680     if ( !m_logicalFunctionSupported )
 681         return;
 682
 683     wxGraphicsPath path = m_graphicContext->CreatePath();
 684
 685     wxPointList::compatibility_iterator node = points->GetFirst();
 686     if ( !node )
 687         // empty list
 688         return;
 689
 690     wxPoint *p = node->GetData();
 691
 692     wxCoord x1 = p->x;
 693     wxCoord y1 = p->y;
 694
 695     node = node->GetNext();
 696     p = node->GetData();
 697
 698     wxCoord x2 = p->x;
 699     wxCoord y2 = p->y;
 700     wxCoord cx1 = ( x1 + x2 ) / 2;
 701     wxCoord cy1 = ( y1 + y2 ) / 2;
 702
 703     path.MoveToPoint( x1 , y1 );
 704     path.AddLineToPoint( cx1 , cy1 );
 705 #if !wxUSE_STD_CONTAINERS
 706
 707     while ((node = node->GetNext()) != NULL)
 708 #else
 709
 710     while ((node = node->GetNext()))
 711 #endif // !wxUSE_STD_CONTAINERS
 712
 713     {
 714         p = node->GetData();
 715         x1 = x2;
 716         y1 = y2;
 717         x2 = p->x;
 718         y2 = p->y;
 719         wxCoord cx4 = (x1 + x2) / 2;
 720         wxCoord cy4 = (y1 + y2) / 2;
 721
 722         path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 723
 724         cx1 = cx4;
 725         cy1 = cy4;
 726     }
 727
 728     path.AddLineToPoint( x2 , y2 );
 729
 730     m_graphicContext->StrokePath( path );
 731 }
 732 #endif // wxUSE_SPLINES
 733
 734 void wxGCDCImpl::DoDrawPolygon( int n, wxPoint points[],
 735                                 wxCoord xoffset, wxCoord yoffset,
 736                                 wxPolygonFillMode fillStyle )
 737 {
 738     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 739
 740     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 741         return;
 742     if ( !m_logicalFunctionSupported )
 743         return;
 744
 745     bool closeIt = false;
 746     if (points[n-1] != points[0])
 747         closeIt = true;
 748
 749     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 750     for( int i = 0; i < n; ++i)
 751     {
 752         pointsD[i].m_x = points[i].x + xoffset;
 753         pointsD[i].m_y = points[i].y + yoffset;
 754     }
 755     if ( closeIt )
 756         pointsD[n] = pointsD[0];
 757
 758     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 759     delete[] pointsD;
 760 }
 761
 762 void wxGCDCImpl::DoDrawPolyPolygon(int n,
 763                                int count[],
 764                                wxPoint points[],
 765                                wxCoord xoffset,
 766                                wxCoord yoffset,
 767                                wxPolygonFillMode fillStyle)
 768 {
 769     wxASSERT(n > 1);
 770     wxGraphicsPath path = m_graphicContext->CreatePath();
 771
 772     int i = 0;
 773     for ( int j = 0; j < n; ++j)
 774     {
 775         wxPoint start = points[i];
 776         path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
 777         ++i;
 778         int l = count[j];
 779         for ( int k = 1; k < l; ++k)
 780         {
 781             path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
 782             ++i;
 783         }
 784         // close the polygon
 785         if ( start != points[i-1])
 786             path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
 787     }
 788     m_graphicContext->DrawPath( path , fillStyle);
 789 }
 790
 791 void wxGCDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 792 {
 793     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 794
 795     if ( !m_logicalFunctionSupported )
 796         return;
 797
 798     // CMB: draw nothing if transformed w or h is 0
 799     if (w == 0 || h == 0)
 800         return;
 801
 802     if ( m_graphicContext->ShouldOffset() )
 803     {
 804         // if we are offsetting the entire rectangle is moved 0.5, so the
 805         // border line gets off by 1
 806         w -= 1;
 807         h -= 1;
 808     }
 809     m_graphicContext->DrawRectangle(x,y,w,h);
 810 }
 811
 812 void wxGCDCImpl::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 813                                     wxCoord w, wxCoord h,
 814                                     double radius)
 815 {
 816     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 817
 818     if ( !m_logicalFunctionSupported )
 819         return;
 820
 821     if (radius < 0.0)
 822         radius = - radius * ((w < h) ? w : h);
 823
 824     // CMB: draw nothing if transformed w or h is 0
 825     if (w == 0 || h == 0)
 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->DrawRoundedRectangle( x,y,w,h,radius);
 836 }
 837
 838 void wxGCDCImpl::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 839 {
 840     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 841
 842     if ( !m_logicalFunctionSupported )
 843         return;
 844
 845     if ( m_graphicContext->ShouldOffset() )
 846     {
 847         // if we are offsetting the entire rectangle is moved 0.5, so the
 848         // border line gets off by 1
 849         w -= 1;
 850         h -= 1;
 851     }
 852     m_graphicContext->DrawEllipse(x,y,w,h);
 853 }
 854
 855 bool wxGCDCImpl::CanDrawBitmap() const
 856 {
 857     return true;
 858 }
 859
 860 bool wxGCDCImpl::DoBlit(
 861     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 862     wxDC *source, wxCoord xsrc, wxCoord ysrc,
 863     wxRasterOperationMode logical_func , bool useMask,
 864     wxCoord xsrcMask, wxCoord ysrcMask )
 865 {
 866     return DoStretchBlit( xdest, ydest, width, height,
 867         source, xsrc, ysrc, width, height, logical_func, useMask,
 868         xsrcMask,ysrcMask );
 869 }
 870
 871 bool wxGCDCImpl::DoStretchBlit(
 872     wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
 873     wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
 874     wxRasterOperationMode logical_func , bool useMask,
 875     wxCoord xsrcMask, wxCoord ysrcMask )
 876 {
 877     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
 878     wxCHECK_MSG( source->IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid source DC") );
 879
 880     if ( logical_func == wxNO_OP )
 881         return true;
 882
 883     wxCompositionMode mode = TranslateRasterOp(logical_func);
 884     if ( mode == wxCOMPOSITION_INVALID )
 885     {
 886         wxFAIL_MSG( wxT("Blitting is not supported with this logical operation.") );
 887         return false;
 888     }
 889
 890     wxRect subrect(source->LogicalToDeviceX(xsrc),
 891                    source->LogicalToDeviceY(ysrc),
 892                    source->LogicalToDeviceXRel(srcWidth),
 893                    source->LogicalToDeviceYRel(srcHeight));
 894     const wxRect subrectOrig = subrect;
 895     // clip the subrect down to the size of the source DC
 896     wxRect clip;
 897     source->GetSize(&clip.width, &clip.height);
 898     subrect.Intersect(clip);
 899     if (subrect.width == 0)
 900         return true;
 901
 902     bool retval = true;
 903
 904     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
 905     if (m_graphicContext->SetCompositionMode(mode))
 906     {
 907         wxAntialiasMode formerAa = m_graphicContext->GetAntialiasMode();
 908         if (mode == wxCOMPOSITION_XOR)
 909         {
 910             m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 911         }
 912
 913         if (xsrcMask == -1 && ysrcMask == -1)
 914         {
 915             xsrcMask = xsrc;
 916             ysrcMask = ysrc;
 917         }
 918
 919         wxBitmap blit = source->GetAsBitmap( &subrect );
 920
 921         if ( blit.IsOk() )
 922         {
 923             if ( !useMask && blit.GetMask() )
 924                 blit.SetMask(NULL);
 925
 926             double x = xdest;
 927             double y = ydest;
 928             double w = dstWidth;
 929             double h = dstHeight;
 930             // adjust dest rect if source rect is clipped
 931             if (subrect.width != subrectOrig.width || subrect.height != subrectOrig.height)
 932             {
 933                 x += (subrect.x - subrectOrig.x) / double(subrectOrig.width) * dstWidth;
 934                 y += (subrect.y - subrectOrig.y) / double(subrectOrig.height) * dstHeight;
 935                 w *= double(subrect.width) / subrectOrig.width;
 936                 h *= double(subrect.height) / subrectOrig.height;
 937             }
 938             m_graphicContext->DrawBitmap(blit, x, y, w, h);
 939         }
 940         else
 941         {
 942             wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
 943             retval = false;
 944         }
 945
 946         if (mode == wxCOMPOSITION_XOR)
 947         {
 948             m_graphicContext->SetAntialiasMode(formerAa);
 949         }
 950     }
 951     // reset composition
 952     m_graphicContext->SetCompositionMode(formerMode);
 953
 954     return retval;
 955 }
 956
 957 void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 958                                double angle)
 959 {
 960     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 961
 962     if ( str.empty() )
 963         return;
 964     if ( !m_logicalFunctionSupported )
 965         return;
 966
 967     if ( m_backgroundMode == wxTRANSPARENT )
 968         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 969     else
 970         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ), m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 971 }
 972
 973 void wxGCDCImpl::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 974 {
 975     // For compatibility with other ports (notably wxGTK) and because it's
 976     // genuinely useful, we allow passing multiline strings to DrawText().
 977     // However there is no native OSX function to draw them directly so we
 978     // instead reuse the generic DrawLabel() method to render them. Of course,
 979     // DrawLabel() itself will call back to us but with single line strings
 980     // only so there won't be any infinite recursion here.
 981     if ( str.find('\n') != wxString::npos )
 982     {
 983         GetOwner()->DrawLabel(str, wxRect(x, y, 0, 0));
 984         return;
 985     }
 986
 987     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawText - invalid DC") );
 988
 989     if ( str.empty() )
 990         return;
 991
 992     if ( !m_logicalFunctionSupported )
 993         return;
 994
 995     if ( m_backgroundMode == wxTRANSPARENT )
 996         m_graphicContext->DrawText( str, x ,y);
 997     else
 998         m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 999 }
1000
1001 bool wxGCDCImpl::CanGetTextExtent() const
1002 {
1003     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
1004
1005     return true;
1006 }
1007
1008 void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
1009                               wxCoord *descent, wxCoord *externalLeading ,
1010                               const wxFont *theFont ) const
1011 {
1012     wxCHECK_RET( m_graphicContext, wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
1013
1014     if ( theFont )
1015     {
1016         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
1017     }
1018
1019     wxDouble h , d , e , w;
1020
1021     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
1022
1023     if ( height )
1024         *height = (wxCoord)(h+0.5);
1025     if ( descent )
1026         *descent = (wxCoord)(d+0.5);
1027     if ( externalLeading )
1028         *externalLeading = (wxCoord)(e+0.5);
1029     if ( width )
1030         *width = (wxCoord)(w+0.5);
1031
1032     if ( theFont )
1033     {
1034         m_graphicContext->SetFont( m_font, m_textForegroundColour );
1035     }
1036 }
1037
1038 bool wxGCDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
1039 {
1040     wxCHECK_MSG( m_graphicContext, false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
1041     widths.Clear();
1042     widths.Add(0,text.Length());
1043     if ( text.IsEmpty() )
1044         return true;
1045
1046     wxArrayDouble widthsD;
1047
1048     m_graphicContext->GetPartialTextExtents( text, widthsD );
1049     for ( size_t i = 0; i < widths.GetCount(); ++i )
1050         widths[i] = (wxCoord)(widthsD[i] + 0.5);
1051
1052     return true;
1053 }
1054
1055 wxCoord wxGCDCImpl::GetCharWidth(void) const
1056 {
1057     wxCoord width;
1058     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
1059
1060     return width;
1061 }
1062
1063 wxCoord wxGCDCImpl::GetCharHeight(void) const
1064 {
1065     wxCoord height;
1066     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
1067
1068     return height;
1069 }
1070
1071 void wxGCDCImpl::Clear(void)
1072 {
1073     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::Clear - invalid DC") );
1074     // TODO better implementation / incorporate size info into wxGCDC or context
1075     m_graphicContext->SetBrush( m_backgroundBrush );
1076     wxPen p = *wxTRANSPARENT_PEN;
1077     m_graphicContext->SetPen( p );
1078     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
1079     m_graphicContext->SetCompositionMode(wxCOMPOSITION_SOURCE);
1080     DoDrawRectangle( 0, 0, 32000 , 32000 );
1081     m_graphicContext->SetCompositionMode(formerMode);
1082     m_graphicContext->SetPen( m_pen );
1083     m_graphicContext->SetBrush( m_brush );
1084 }
1085
1086 void wxGCDCImpl::DoGetSize(int *width, int *height) const
1087 {
1088     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetSize - invalid DC") );
1089     wxDouble w,h;
1090     m_graphicContext->GetSize( &w, &h );
1091     if ( height )
1092         *height = (int) (h+0.5);
1093     if ( width )
1094         *width = (int) (w+0.5);
1095 }
1096
1097 void wxGCDCImpl::DoGradientFillLinear(const wxRect& rect,
1098                                   const wxColour& initialColour,
1099                                   const wxColour& destColour,
1100                                   wxDirection nDirection )
1101 {
1102     wxPoint start;
1103     wxPoint end;
1104     switch( nDirection)
1105     {
1106     case wxWEST :
1107         start = rect.GetRightBottom();
1108         start.x++;
1109         end = rect.GetLeftBottom();
1110         break;
1111     case wxEAST :
1112         start = rect.GetLeftBottom();
1113         end = rect.GetRightBottom();
1114         end.x++;
1115         break;
1116     case wxNORTH :
1117         start = rect.GetLeftBottom();
1118         start.y++;
1119         end = rect.GetLeftTop();
1120         break;
1121     case wxSOUTH :
1122         start = rect.GetLeftTop();
1123         end = rect.GetLeftBottom();
1124         end.y++;
1125         break;
1126     default :
1127         break;
1128     }
1129
1130     if (rect.width == 0 || rect.height == 0)
1131         return;
1132
1133     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
1134         start.x,start.y,end.x,end.y, initialColour, destColour));
1135     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
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::DoGradientFillConcentric(const wxRect& rect,
1142                                       const wxColour& initialColour,
1143                                       const wxColour& destColour,
1144                                       const wxPoint& circleCenter)
1145 {
1146     //Radius
1147     wxInt32 cx = rect.GetWidth() / 2;
1148     wxInt32 cy = rect.GetHeight() / 2;
1149     wxInt32 nRadius;
1150     if (cx < cy)
1151         nRadius = cx;
1152     else
1153         nRadius = cy;
1154
1155     // make sure the background is filled (todo move into specific platform implementation ?)
1156     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1157     m_graphicContext->SetBrush( wxBrush( destColour) );
1158     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1159
1160     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
1161         rect.x+circleCenter.x,rect.y+circleCenter.y,
1162         rect.x+circleCenter.x,rect.y+circleCenter.y,
1163         nRadius,initialColour,destColour));
1164
1165     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1166     m_graphicContext->SetPen(m_pen);
1167     m_graphicContext->SetBrush(m_brush);
1168 }
1169
1170 void wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
1171                              wxCoord width, wxCoord height)
1172 {
1173     wxDCImpl::DoDrawCheckMark(x,y,width,height);
1174 }
1175
1176 #ifdef __WXMSW__
1177 wxRect wxGCDCImpl::MSWApplyGDIPlusTransform(const wxRect& r) const
1178 {
1179     wxGraphicsContext* const gc = GetGraphicsContext();
1180     wxCHECK_MSG( gc, r, wxT("Invalid wxGCDC") );
1181
1182     double x = 0,
1183            y = 0;
1184     gc->GetTransform().TransformPoint(&x, &y);
1185
1186     wxRect rect(r);
1187     rect.Offset(x, y);
1188
1189     return rect;
1190 }
1191 #endif // __WXMSW__
1192
1193 #endif // wxUSE_GRAPHICS_CONTEXT