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/dcgraph.h"
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/icon.h"
  25     #include "wx/dcclient.h"
  26     #include "wx/dcmemory.h"
  27 #endif
  28
  29 //-----------------------------------------------------------------------------
  30 // constants
  31 //-----------------------------------------------------------------------------
  32
  33 static const double RAD2DEG = 180.0 / M_PI;
  34
  35 //-----------------------------------------------------------------------------
  36 // Local functions
  37 //-----------------------------------------------------------------------------
  38
  39 static inline double DegToRad(double deg)
  40 {
  41     return (deg * M_PI) / 180.0;
  42 }
  43
  44 static wxCompositionMode TranslateRasterOp(wxRasterOperationMode function)
  45 {
  46     switch ( function )
  47     {
  48         case wxCOPY: // src
  49             // since we are supporting alpha, _OVER is closer to the intention than _SOURCE
  50             // since the latter would overwrite even when alpha is not set to opaque
  51             return wxCOMPOSITION_OVER;
  52
  53         case wxOR:         // src OR dst
  54             return wxCOMPOSITION_ADD;
  55
  56         case wxNO_OP:      // dst
  57             return wxCOMPOSITION_DEST; // ignore the source
  58
  59         case wxCLEAR:      // 0
  60             return wxCOMPOSITION_CLEAR;// clear dst
  61
  62         case wxXOR:        // src XOR dst
  63             return wxCOMPOSITION_XOR;
  64
  65         case wxAND:        // src AND dst
  66         case wxAND_INVERT: // (NOT src) AND dst
  67         case wxAND_REVERSE:// src AND (NOT dst)
  68         case wxEQUIV:      // (NOT src) XOR dst
  69         case wxINVERT:     // NOT dst
  70         case wxNAND:       // (NOT src) OR (NOT dst)
  71         case wxNOR:        // (NOT src) AND (NOT dst)
  72         case wxOR_INVERT:  // (NOT src) OR dst
  73         case wxOR_REVERSE: // src OR (NOT dst)
  74         case wxSET:        // 1
  75         case wxSRC_INVERT: // NOT src
  76             break;
  77     }
  78
  79     return wxCOMPOSITION_INVALID;
  80 }
  81
  82 //-----------------------------------------------------------------------------
  83 // wxDC bridge class
  84 //-----------------------------------------------------------------------------
  85
  86 IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDC)
  87
  88 wxGCDC::wxGCDC(const wxWindowDC& dc) :
  89   wxDC( new wxGCDCImpl( this, dc ) )
  90 {
  91 }
  92
  93 wxGCDC::wxGCDC( const wxMemoryDC& dc) :
  94   wxDC( new wxGCDCImpl( this, dc ) )
  95 {
  96 }
  97
  98 #if wxUSE_PRINTING_ARCHITECTURE
  99 wxGCDC::wxGCDC( const wxPrinterDC& dc) :
 100   wxDC( new wxGCDCImpl( this, dc ) )
 101 {
 102 }
 103 #endif
 104
 105 #if defined(__WXMSW__) && wxUSE_ENH_METAFILE
 106 wxGCDC::wxGCDC(const wxEnhMetaFileDC& dc)
 107    : wxDC(new wxGCDCImpl(this, dc))
 108 {
 109 }
 110 #endif
 111
 112 wxGCDC::wxGCDC(wxGraphicsContext* context) :
 113     wxDC( new wxGCDCImpl( this ) )
 114 {
 115     SetGraphicsContext(context);
 116 }
 117
 118 wxGCDC::wxGCDC() :
 119   wxDC( new wxGCDCImpl( this ) )
 120 {
 121 }
 122
 123 wxGCDC::~wxGCDC()
 124 {
 125 }
 126
 127 wxGraphicsContext* wxGCDC::GetGraphicsContext() const
 128 {
 129     if (!m_pimpl) return NULL;
 130     wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
 131     return gc_impl->GetGraphicsContext();
 132 }
 133
 134 void wxGCDC::SetGraphicsContext( wxGraphicsContext* ctx )
 135 {
 136     if (!m_pimpl) return;
 137     wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
 138     gc_impl->SetGraphicsContext( ctx );
 139 }
 140
 141 IMPLEMENT_ABSTRACT_CLASS(wxGCDCImpl, wxDCImpl)
 142
 143 wxGCDCImpl::wxGCDCImpl( wxDC *owner ) :
 144    wxDCImpl( owner )
 145 {
 146     Init(wxGraphicsContext::Create());
 147 }
 148
 149 void wxGCDCImpl::SetGraphicsContext( wxGraphicsContext* ctx )
 150 {
 151     delete m_graphicContext;
 152     m_graphicContext = ctx;
 153     if ( m_graphicContext )
 154     {
 155         m_matrixOriginal = m_graphicContext->GetTransform();
 156         m_ok = true;
 157         // apply the stored transformations to the passed in context
 158         ComputeScaleAndOrigin();
 159         m_graphicContext->SetFont( m_font , m_textForegroundColour );
 160         m_graphicContext->SetPen( m_pen );
 161         m_graphicContext->SetBrush( m_brush);
 162     }
 163 }
 164
 165 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxWindowDC& dc ) :
 166    wxDCImpl( owner )
 167 {
 168     Init(wxGraphicsContext::Create(dc));
 169     m_window = dc.GetWindow();
 170 }
 171
 172 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxMemoryDC& dc ) :
 173    wxDCImpl( owner )
 174 {
 175     Init(wxGraphicsContext::Create(dc));
 176 }
 177
 178 #if wxUSE_PRINTING_ARCHITECTURE
 179 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxPrinterDC& dc ) :
 180    wxDCImpl( owner )
 181 {
 182     Init(wxGraphicsContext::Create(dc));
 183 }
 184 #endif
 185
 186 #if defined(__WXMSW__) && wxUSE_ENH_METAFILE
 187 wxGCDCImpl::wxGCDCImpl(wxDC *owner, const wxEnhMetaFileDC& dc)
 188    : wxDCImpl(owner)
 189 {
 190     Init(wxGraphicsContext::Create(dc));
 191 }
 192 #endif
 193
 194 wxGCDCImpl::wxGCDCImpl(wxDC* owner, int)
 195    : wxDCImpl(owner)
 196 {
 197     // derived class will set a context
 198     Init(NULL);
 199 }
 200
 201 void wxGCDCImpl::Init(wxGraphicsContext* ctx)
 202 {
 203     m_ok = false;
 204     m_colour = true;
 205     m_mm_to_pix_x = mm2pt;
 206     m_mm_to_pix_y = mm2pt;
 207
 208     m_pen = *wxBLACK_PEN;
 209     m_font = *wxNORMAL_FONT;
 210     m_brush = *wxWHITE_BRUSH;
 211
 212     m_graphicContext = NULL;
 213     if (ctx)
 214         SetGraphicsContext(ctx);
 215
 216     m_logicalFunctionSupported = true;
 217 }
 218
 219 wxGCDCImpl::~wxGCDCImpl()
 220 {
 221     delete m_graphicContext;
 222 }
 223
 224 void wxGCDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y,
 225                                bool useMask )
 226 {
 227     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
 228     wxCHECK_RET( bmp.IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
 229
 230     int w = bmp.GetScaledWidth();
 231     int h = bmp.GetScaledHeight();
 232     if ( bmp.GetDepth() == 1 )
 233     {
 234         m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 235         m_graphicContext->SetBrush( wxBrush( m_textBackgroundColour , wxSOLID ) );
 236         m_graphicContext->DrawRectangle( x, y, w, h );
 237         m_graphicContext->SetBrush( wxBrush( m_textForegroundColour , wxSOLID ) );
 238         m_graphicContext->DrawBitmap( bmp, x, y, w, h );
 239         m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
 240         m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
 241     }
 242     else // not a monochrome bitmap, handle it normally
 243     {
 244         // make a copy in case we need to remove its mask, if we don't modify
 245         // it the copy is cheap as bitmaps are reference-counted
 246         wxBitmap bmpCopy(bmp);
 247         if ( !useMask && bmp.GetMask() )
 248             bmpCopy.SetMask(NULL);
 249
 250         m_graphicContext->DrawBitmap( bmpCopy, x, y, w, h );
 251     }
 252 }
 253
 254 void wxGCDCImpl::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
 255 {
 256     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
 257     wxCHECK_RET( icon.IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
 258
 259     wxCoord w = icon.GetWidth();
 260     wxCoord h = icon.GetHeight();
 261
 262     m_graphicContext->DrawIcon( icon , x, y, w, h );
 263 }
 264
 265 bool wxGCDCImpl::StartDoc( const wxString& WXUNUSED(message) )
 266 {
 267     return true;
 268 }
 269
 270 void wxGCDCImpl::EndDoc()
 271 {
 272 }
 273
 274 void wxGCDCImpl::StartPage()
 275 {
 276 }
 277
 278 void wxGCDCImpl::EndPage()
 279 {
 280 }
 281
 282 void wxGCDCImpl::Flush()
 283 {
 284     m_graphicContext->Flush();
 285 }
 286
 287 void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
 288 {
 289     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
 290
 291     m_graphicContext->Clip( x, y, w, h );
 292
 293     wxDCImpl::DoSetClippingRegion(x, y, w, h);
 294 }
 295
 296 void wxGCDCImpl::DoSetDeviceClippingRegion( const wxRegion &region )
 297 {
 298     // region is in device coordinates
 299     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetDeviceClippingRegion - invalid DC") );
 300
 301     if (region.Empty())
 302     {
 303         //DestroyClippingRegion();
 304         return;
 305     }
 306
 307     wxRegion logRegion( region );
 308     wxCoord x, y, w, h;
 309
 310     logRegion.Offset( DeviceToLogicalX(0), DeviceToLogicalY(0) );
 311     logRegion.GetBox( x, y, w, h );
 312
 313     m_graphicContext->Clip( logRegion );
 314     if ( m_clipping )
 315     {
 316         m_clipX1 = wxMax( m_clipX1, x );
 317         m_clipY1 = wxMax( m_clipY1, y );
 318         m_clipX2 = wxMin( m_clipX2, (x + w) );
 319         m_clipY2 = wxMin( m_clipY2, (y + h) );
 320     }
 321     else
 322     {
 323         m_clipping = true;
 324
 325         m_clipX1 = x;
 326         m_clipY1 = y;
 327         m_clipX2 = x + w;
 328         m_clipY2 = y + h;
 329     }
 330 }
 331
 332 void wxGCDCImpl::DestroyClippingRegion()
 333 {
 334     m_graphicContext->ResetClip();
 335     // currently the clip eg of a window extends to the area between the scrollbars
 336     // so we must explicitly make sure it only covers the area we want it to draw
 337     int width, height ;
 338     GetOwner()->GetSize( &width , &height ) ;
 339     m_graphicContext->Clip( DeviceToLogicalX(0) , DeviceToLogicalY(0) , DeviceToLogicalXRel(width), DeviceToLogicalYRel(height) );
 340
 341     m_graphicContext->SetPen( m_pen );
 342     m_graphicContext->SetBrush( m_brush );
 343
 344     m_clipping = false;
 345 }
 346
 347 void wxGCDCImpl::DoGetSizeMM( int* width, int* height ) const
 348 {
 349     int w = 0, h = 0;
 350
 351     GetOwner()->GetSize( &w, &h );
 352     if (width)
 353         *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
 354     if (height)
 355         *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
 356 }
 357
 358 void wxGCDCImpl::SetTextForeground( const wxColour &col )
 359 {
 360     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 361
 362     // don't set m_textForegroundColour to an invalid colour as we'd crash
 363     // later then (we use m_textForegroundColour.GetColor() without checking
 364     // in a few places)
 365     if ( col.IsOk() )
 366     {
 367         m_textForegroundColour = col;
 368         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 369     }
 370 }
 371
 372 void wxGCDCImpl::SetTextBackground( const wxColour &col )
 373 {
 374     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 375
 376     m_textBackgroundColour = col;
 377 }
 378
 379 wxSize wxGCDCImpl::GetPPI() const
 380 {
 381     return wxSize(72, 72);
 382 }
 383
 384 int wxGCDCImpl::GetDepth() const
 385 {
 386     return 32;
 387 }
 388
 389 void wxGCDCImpl::ComputeScaleAndOrigin()
 390 {
 391     wxDCImpl::ComputeScaleAndOrigin();
 392
 393     if ( m_graphicContext )
 394     {
 395         m_matrixCurrent = m_graphicContext->CreateMatrix();
 396
 397         // the logical origin sets the origin to have new coordinates
 398         m_matrixCurrent.Translate( m_deviceOriginX - m_logicalOriginX * m_signX * m_scaleX,
 399                                    m_deviceOriginY - m_logicalOriginY * m_signY * m_scaleY);
 400
 401         m_matrixCurrent.Scale( m_scaleX * m_signX, m_scaleY * m_signY );
 402
 403         m_graphicContext->SetTransform( m_matrixOriginal );
 404         m_graphicContext->ConcatTransform( m_matrixCurrent );
 405     }
 406 }
 407
 408 void* wxGCDCImpl::GetHandle() const
 409 {
 410     void* cgctx = NULL;
 411     wxGraphicsContext* gc = GetGraphicsContext();
 412     if (gc) {
 413         cgctx = gc->GetNativeContext();
 414     }
 415     return cgctx;
 416 }
 417
 418 void wxGCDCImpl::SetPalette( const wxPalette& WXUNUSED(palette) )
 419 {
 420
 421 }
 422
 423 void wxGCDCImpl::SetBackgroundMode( int mode )
 424 {
 425     m_backgroundMode = mode;
 426 }
 427
 428 void wxGCDCImpl::SetFont( const wxFont &font )
 429 {
 430     m_font = font;
 431     if ( m_graphicContext )
 432     {
 433         m_graphicContext->SetFont(font, m_textForegroundColour);
 434     }
 435 }
 436
 437 void wxGCDCImpl::SetPen( const wxPen &pen )
 438 {
 439     m_pen = pen;
 440     if ( m_graphicContext )
 441     {
 442         m_graphicContext->SetPen( m_pen );
 443     }
 444 }
 445
 446 void wxGCDCImpl::SetBrush( const wxBrush &brush )
 447 {
 448     m_brush = brush;
 449     if ( m_graphicContext )
 450     {
 451         m_graphicContext->SetBrush( m_brush );
 452     }
 453 }
 454
 455 void wxGCDCImpl::SetBackground( const wxBrush &brush )
 456 {
 457     m_backgroundBrush = brush;
 458     if (!m_backgroundBrush.IsOk())
 459         return;
 460 }
 461
 462 void wxGCDCImpl::SetLogicalFunction( wxRasterOperationMode function )
 463 {
 464     m_logicalFunction = function;
 465
 466     wxCompositionMode mode = TranslateRasterOp( function );
 467     m_logicalFunctionSupported = mode != wxCOMPOSITION_INVALID;
 468     if (m_logicalFunctionSupported)
 469         m_logicalFunctionSupported = m_graphicContext->SetCompositionMode(mode);
 470
 471     if ( function == wxXOR )
 472         m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 473     else
 474         m_graphicContext->SetAntialiasMode(wxANTIALIAS_DEFAULT);
 475 }
 476
 477 bool wxGCDCImpl::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 478                              const wxColour& WXUNUSED(col),
 479                              wxFloodFillStyle WXUNUSED(style))
 480 {
 481     return false;
 482 }
 483
 484 bool wxGCDCImpl::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 485 {
 486     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 487     return false;
 488 }
 489
 490 void wxGCDCImpl::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 491 {
 492     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 493
 494     if ( !m_logicalFunctionSupported )
 495         return;
 496
 497     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 498
 499     CalcBoundingBox(x1, y1);
 500     CalcBoundingBox(x2, y2);
 501 }
 502
 503 void wxGCDCImpl::DoCrossHair( wxCoord x, wxCoord y )
 504 {
 505     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 506
 507     if ( !m_logicalFunctionSupported )
 508         return;
 509
 510     int w = 0, h = 0;
 511
 512     GetOwner()->GetSize( &w, &h );
 513
 514     m_graphicContext->StrokeLine(0,y,w,y);
 515     m_graphicContext->StrokeLine(x,0,x,h);
 516
 517     CalcBoundingBox(0, 0);
 518     CalcBoundingBox(0+w, 0+h);
 519 }
 520
 521 void wxGCDCImpl::DoDrawArc( wxCoord x1, wxCoord y1,
 522                         wxCoord x2, wxCoord y2,
 523                         wxCoord xc, wxCoord yc )
 524 {
 525     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 526
 527     if ( !m_logicalFunctionSupported )
 528         return;
 529
 530     double dx = x1 - xc;
 531     double dy = y1 - yc;
 532     double radius = sqrt((double)(dx * dx + dy * dy));
 533     wxCoord rad = (wxCoord)radius;
 534     double sa, ea;
 535     if (x1 == x2 && y1 == y2)
 536     {
 537         sa = 0.0;
 538         ea = 360.0;
 539     }
 540     else if (radius == 0.0)
 541     {
 542         sa = ea = 0.0;
 543     }
 544     else
 545     {
 546         sa = (x1 - xc == 0) ?
 547      (y1 - yc < 0) ? 90.0 : -90.0 :
 548              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 549         ea = (x2 - xc == 0) ?
 550      (y2 - yc < 0) ? 90.0 : -90.0 :
 551              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 552     }
 553
 554     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 555
 556     wxGraphicsPath path = m_graphicContext->CreatePath();
 557     if ( fill && ((x1!=x2)||(y1!=y2)) )
 558         path.MoveToPoint( xc, yc );
 559     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 560     // get clockwise angles
 561     path.AddArc( xc, yc , rad , DegToRad(-sa) , DegToRad(-ea), false );
 562     if ( fill && ((x1!=x2)||(y1!=y2)) )
 563         path.AddLineToPoint( xc, yc );
 564     m_graphicContext->DrawPath(path);
 565 }
 566
 567 void wxGCDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 568                                 double sa, double ea )
 569 {
 570     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 571
 572     if ( !m_logicalFunctionSupported )
 573         return;
 574
 575     m_graphicContext->PushState();
 576     m_graphicContext->Translate(x+w/2.0,y+h/2.0);
 577     wxDouble factor = ((wxDouble) w) / h;
 578     m_graphicContext->Scale( factor , 1.0);
 579
 580     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 581     // get clockwise angles
 582     if ( m_brush.GetStyle() != wxTRANSPARENT )
 583     {
 584         wxGraphicsPath path = m_graphicContext->CreatePath();
 585         path.MoveToPoint( 0, 0 );
 586         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 587         path.AddLineToPoint( 0, 0 );
 588         m_graphicContext->FillPath( path );
 589
 590         path = m_graphicContext->CreatePath();
 591         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 592         m_graphicContext->StrokePath( path );
 593     }
 594     else
 595     {
 596         wxGraphicsPath path = m_graphicContext->CreatePath();
 597         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 598         m_graphicContext->DrawPath( path );
 599     }
 600
 601     m_graphicContext->PopState();
 602 }
 603
 604 void wxGCDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
 605 {
 606     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 607
 608     DoDrawLine( x , y , x + 1 , y + 1 );
 609 }
 610
 611 void wxGCDCImpl::DoDrawLines(int n, const wxPoint points[],
 612                          wxCoord xoffset, wxCoord yoffset)
 613 {
 614     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 615
 616     if ( !m_logicalFunctionSupported )
 617         return;
 618
 619     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 620     for( int i = 0; i < n; ++i)
 621     {
 622         pointsD[i].m_x = points[i].x + xoffset;
 623         pointsD[i].m_y = points[i].y + yoffset;
 624     }
 625
 626     m_graphicContext->StrokeLines( n , pointsD);
 627     delete[] pointsD;
 628 }
 629
 630 #if wxUSE_SPLINES
 631 void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
 632 {
 633     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 634
 635     if ( !m_logicalFunctionSupported )
 636         return;
 637
 638     wxGraphicsPath path = m_graphicContext->CreatePath();
 639
 640     wxPointList::compatibility_iterator node = points->GetFirst();
 641     if ( !node )
 642         // empty list
 643         return;
 644
 645     const wxPoint *p = node->GetData();
 646
 647     wxCoord x1 = p->x;
 648     wxCoord y1 = p->y;
 649
 650     node = node->GetNext();
 651     p = node->GetData();
 652
 653     wxCoord x2 = p->x;
 654     wxCoord y2 = p->y;
 655     wxCoord cx1 = ( x1 + x2 ) / 2;
 656     wxCoord cy1 = ( y1 + y2 ) / 2;
 657
 658     path.MoveToPoint( x1 , y1 );
 659     path.AddLineToPoint( cx1 , cy1 );
 660 #if !wxUSE_STD_CONTAINERS
 661
 662     while ((node = node->GetNext()) != NULL)
 663 #else
 664
 665     while ((node = node->GetNext()))
 666 #endif // !wxUSE_STD_CONTAINERS
 667
 668     {
 669         p = node->GetData();
 670         x1 = x2;
 671         y1 = y2;
 672         x2 = p->x;
 673         y2 = p->y;
 674         wxCoord cx4 = (x1 + x2) / 2;
 675         wxCoord cy4 = (y1 + y2) / 2;
 676
 677         path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 678
 679         cx1 = cx4;
 680         cy1 = cy4;
 681     }
 682
 683     path.AddLineToPoint( x2 , y2 );
 684
 685     m_graphicContext->StrokePath( path );
 686 }
 687 #endif // wxUSE_SPLINES
 688
 689 void wxGCDCImpl::DoDrawPolygon( int n, const wxPoint points[],
 690                                 wxCoord xoffset, wxCoord yoffset,
 691                                 wxPolygonFillMode fillStyle )
 692 {
 693     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 694
 695     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 696         return;
 697     if ( !m_logicalFunctionSupported )
 698         return;
 699
 700     bool closeIt = false;
 701     if (points[n-1] != points[0])
 702         closeIt = true;
 703
 704     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 705     for( int i = 0; i < n; ++i)
 706     {
 707         pointsD[i].m_x = points[i].x + xoffset;
 708         pointsD[i].m_y = points[i].y + yoffset;
 709     }
 710     if ( closeIt )
 711         pointsD[n] = pointsD[0];
 712
 713     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 714     delete[] pointsD;
 715 }
 716
 717 void wxGCDCImpl::DoDrawPolyPolygon(int n,
 718                                const int count[],
 719                                const wxPoint points[],
 720                                wxCoord xoffset,
 721                                wxCoord yoffset,
 722                                wxPolygonFillMode fillStyle)
 723 {
 724     wxASSERT(n > 1);
 725     wxGraphicsPath path = m_graphicContext->CreatePath();
 726
 727     int i = 0;
 728     for ( int j = 0; j < n; ++j)
 729     {
 730         wxPoint start = points[i];
 731         path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
 732         ++i;
 733         int l = count[j];
 734         for ( int k = 1; k < l; ++k)
 735         {
 736             path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
 737             ++i;
 738         }
 739         // close the polygon
 740         if ( start != points[i-1])
 741             path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
 742     }
 743     m_graphicContext->DrawPath( path , fillStyle);
 744 }
 745
 746 void wxGCDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 747 {
 748     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 749
 750     if ( !m_logicalFunctionSupported )
 751         return;
 752
 753     // CMB: draw nothing if transformed w or h is 0
 754     if (w == 0 || h == 0)
 755         return;
 756
 757     if ( m_graphicContext->ShouldOffset() )
 758     {
 759         // if we are offsetting the entire rectangle is moved 0.5, so the
 760         // border line gets off by 1
 761         w -= 1;
 762         h -= 1;
 763     }
 764     m_graphicContext->DrawRectangle(x,y,w,h);
 765 }
 766
 767 void wxGCDCImpl::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 768                                     wxCoord w, wxCoord h,
 769                                     double radius)
 770 {
 771     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 772
 773     if ( !m_logicalFunctionSupported )
 774         return;
 775
 776     if (radius < 0.0)
 777         radius = - radius * ((w < h) ? w : h);
 778
 779     // CMB: draw nothing if transformed w or h is 0
 780     if (w == 0 || h == 0)
 781         return;
 782
 783     if ( m_graphicContext->ShouldOffset() )
 784     {
 785         // if we are offsetting the entire rectangle is moved 0.5, so the
 786         // border line gets off by 1
 787         w -= 1;
 788         h -= 1;
 789     }
 790     m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
 791 }
 792
 793 void wxGCDCImpl::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 794 {
 795     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 796
 797     if ( !m_logicalFunctionSupported )
 798         return;
 799
 800     if ( m_graphicContext->ShouldOffset() )
 801     {
 802         // if we are offsetting the entire rectangle is moved 0.5, so the
 803         // border line gets off by 1
 804         w -= 1;
 805         h -= 1;
 806     }
 807     m_graphicContext->DrawEllipse(x,y,w,h);
 808 }
 809
 810 bool wxGCDCImpl::CanDrawBitmap() const
 811 {
 812     return true;
 813 }
 814
 815 bool wxGCDCImpl::DoBlit(
 816     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 817     wxDC *source, wxCoord xsrc, wxCoord ysrc,
 818     wxRasterOperationMode logical_func , bool useMask,
 819     wxCoord xsrcMask, wxCoord ysrcMask )
 820 {
 821     return DoStretchBlit( xdest, ydest, width, height,
 822         source, xsrc, ysrc, width, height, logical_func, useMask,
 823         xsrcMask,ysrcMask );
 824 }
 825
 826 bool wxGCDCImpl::DoStretchBlit(
 827     wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
 828     wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
 829     wxRasterOperationMode logical_func , bool useMask,
 830     wxCoord xsrcMask, wxCoord ysrcMask )
 831 {
 832     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
 833     wxCHECK_MSG( source->IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid source DC") );
 834
 835     if ( logical_func == wxNO_OP )
 836         return true;
 837
 838     wxCompositionMode mode = TranslateRasterOp(logical_func);
 839     if ( mode == wxCOMPOSITION_INVALID )
 840     {
 841         wxFAIL_MSG( wxT("Blitting is not supported with this logical operation.") );
 842         return false;
 843     }
 844
 845     wxRect subrect(source->LogicalToDeviceX(xsrc),
 846                    source->LogicalToDeviceY(ysrc),
 847                    source->LogicalToDeviceXRel(srcWidth),
 848                    source->LogicalToDeviceYRel(srcHeight));
 849     const wxRect subrectOrig = subrect;
 850     // clip the subrect down to the size of the source DC
 851     wxRect clip;
 852     source->GetSize(&clip.width, &clip.height);
 853     subrect.Intersect(clip);
 854     if (subrect.width == 0)
 855         return true;
 856
 857     bool retval = true;
 858
 859     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
 860     if (m_graphicContext->SetCompositionMode(mode))
 861     {
 862         wxAntialiasMode formerAa = m_graphicContext->GetAntialiasMode();
 863         if (mode == wxCOMPOSITION_XOR)
 864         {
 865             m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 866         }
 867
 868         if (xsrcMask == -1 && ysrcMask == -1)
 869         {
 870             xsrcMask = xsrc;
 871             ysrcMask = ysrc;
 872         }
 873
 874         wxBitmap blit = source->GetAsBitmap( &subrect );
 875
 876         if ( blit.IsOk() )
 877         {
 878             if ( !useMask && blit.GetMask() )
 879                 blit.SetMask(NULL);
 880
 881             double x = xdest;
 882             double y = ydest;
 883             double w = dstWidth;
 884             double h = dstHeight;
 885             // adjust dest rect if source rect is clipped
 886             if (subrect.width != subrectOrig.width || subrect.height != subrectOrig.height)
 887             {
 888                 x += (subrect.x - subrectOrig.x) / double(subrectOrig.width) * dstWidth;
 889                 y += (subrect.y - subrectOrig.y) / double(subrectOrig.height) * dstHeight;
 890                 w *= double(subrect.width) / subrectOrig.width;
 891                 h *= double(subrect.height) / subrectOrig.height;
 892             }
 893             m_graphicContext->DrawBitmap(blit, x, y, w, h);
 894         }
 895         else
 896         {
 897             wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
 898             retval = false;
 899         }
 900
 901         if (mode == wxCOMPOSITION_XOR)
 902         {
 903             m_graphicContext->SetAntialiasMode(formerAa);
 904         }
 905     }
 906     // reset composition
 907     m_graphicContext->SetCompositionMode(formerMode);
 908
 909     return retval;
 910 }
 911
 912 void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 913                                double angle)
 914 {
 915     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 916
 917     if ( str.empty() )
 918         return;
 919     if ( !m_logicalFunctionSupported )
 920         return;
 921
 922     if ( m_backgroundMode == wxTRANSPARENT )
 923         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 924     else
 925         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ), m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 926 }
 927
 928 void wxGCDCImpl::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 929 {
 930     // For compatibility with other ports (notably wxGTK) and because it's
 931     // genuinely useful, we allow passing multiline strings to DrawText().
 932     // However there is no native OSX function to draw them directly so we
 933     // instead reuse the generic DrawLabel() method to render them. Of course,
 934     // DrawLabel() itself will call back to us but with single line strings
 935     // only so there won't be any infinite recursion here.
 936     if ( str.find('\n') != wxString::npos )
 937     {
 938         GetOwner()->DrawLabel(str, wxRect(x, y, 0, 0));
 939         return;
 940     }
 941
 942     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawText - invalid DC") );
 943
 944     if ( str.empty() )
 945         return;
 946
 947     if ( !m_logicalFunctionSupported )
 948         return;
 949
 950     if ( m_backgroundMode == wxTRANSPARENT )
 951         m_graphicContext->DrawText( str, x ,y);
 952     else
 953         m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 954 }
 955
 956 bool wxGCDCImpl::CanGetTextExtent() const
 957 {
 958     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 959
 960     return true;
 961 }
 962
 963 void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
 964                               wxCoord *descent, wxCoord *externalLeading ,
 965                               const wxFont *theFont ) const
 966 {
 967     wxCHECK_RET( m_graphicContext, wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 968
 969     if ( theFont )
 970     {
 971         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
 972     }
 973
 974     wxDouble h , d , e , w;
 975
 976     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
 977
 978     if ( height )
 979         *height = (wxCoord)(h+0.5);
 980     if ( descent )
 981         *descent = (wxCoord)(d+0.5);
 982     if ( externalLeading )
 983         *externalLeading = (wxCoord)(e+0.5);
 984     if ( width )
 985         *width = (wxCoord)(w+0.5);
 986
 987     if ( theFont )
 988     {
 989         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 990     }
 991 }
 992
 993 bool wxGCDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 994 {
 995     wxCHECK_MSG( m_graphicContext, false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
 996     widths.Clear();
 997     widths.Add(0,text.Length());
 998     if ( text.IsEmpty() )
 999         return true;
1000
1001     wxArrayDouble widthsD;
1002
1003     m_graphicContext->GetPartialTextExtents( text, widthsD );
1004     for ( size_t i = 0; i < widths.GetCount(); ++i )
1005         widths[i] = (wxCoord)(widthsD[i] + 0.5);
1006
1007     return true;
1008 }
1009
1010 wxCoord wxGCDCImpl::GetCharWidth(void) const
1011 {
1012     wxCoord width;
1013     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
1014
1015     return width;
1016 }
1017
1018 wxCoord wxGCDCImpl::GetCharHeight(void) const
1019 {
1020     wxCoord height;
1021     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
1022
1023     return height;
1024 }
1025
1026 void wxGCDCImpl::Clear(void)
1027 {
1028     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::Clear - invalid DC") );
1029     // TODO better implementation / incorporate size info into wxGCDC or context
1030     m_graphicContext->SetBrush( m_backgroundBrush );
1031     wxPen p = *wxTRANSPARENT_PEN;
1032     m_graphicContext->SetPen( p );
1033     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
1034     m_graphicContext->SetCompositionMode(wxCOMPOSITION_SOURCE);
1035     // maximum positive coordinate Cairo can handle is 2^23 - 1
1036     DoDrawRectangle(
1037         DeviceToLogicalX(0), DeviceToLogicalY(0),
1038         DeviceToLogicalXRel(0x007fffff), DeviceToLogicalYRel(0x007fffff));
1039     m_graphicContext->SetCompositionMode(formerMode);
1040     m_graphicContext->SetPen( m_pen );
1041     m_graphicContext->SetBrush( m_brush );
1042 }
1043
1044 void wxGCDCImpl::DoGetSize(int *width, int *height) const
1045 {
1046     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetSize - invalid DC") );
1047     wxDouble w,h;
1048     m_graphicContext->GetSize( &w, &h );
1049     if ( height )
1050         *height = (int) (h+0.5);
1051     if ( width )
1052         *width = (int) (w+0.5);
1053 }
1054
1055 void wxGCDCImpl::DoGradientFillLinear(const wxRect& rect,
1056                                   const wxColour& initialColour,
1057                                   const wxColour& destColour,
1058                                   wxDirection nDirection )
1059 {
1060     wxPoint start;
1061     wxPoint end;
1062     switch( nDirection)
1063     {
1064     case wxWEST :
1065         start = rect.GetRightBottom();
1066         start.x++;
1067         end = rect.GetLeftBottom();
1068         break;
1069     case wxEAST :
1070         start = rect.GetLeftBottom();
1071         end = rect.GetRightBottom();
1072         end.x++;
1073         break;
1074     case wxNORTH :
1075         start = rect.GetLeftBottom();
1076         start.y++;
1077         end = rect.GetLeftTop();
1078         break;
1079     case wxSOUTH :
1080         start = rect.GetLeftTop();
1081         end = rect.GetLeftBottom();
1082         end.y++;
1083         break;
1084     default :
1085         break;
1086     }
1087
1088     if (rect.width == 0 || rect.height == 0)
1089         return;
1090
1091     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
1092         start.x,start.y,end.x,end.y, initialColour, destColour));
1093     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1094     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1095     m_graphicContext->SetPen(m_pen);
1096     m_graphicContext->SetBrush(m_brush);
1097 }
1098
1099 void wxGCDCImpl::DoGradientFillConcentric(const wxRect& rect,
1100                                       const wxColour& initialColour,
1101                                       const wxColour& destColour,
1102                                       const wxPoint& circleCenter)
1103 {
1104     //Radius
1105     wxInt32 cx = rect.GetWidth() / 2;
1106     wxInt32 cy = rect.GetHeight() / 2;
1107     wxInt32 nRadius;
1108     if (cx < cy)
1109         nRadius = cx;
1110     else
1111         nRadius = cy;
1112
1113     // make sure the background is filled (todo move into specific platform implementation ?)
1114     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1115     m_graphicContext->SetBrush( wxBrush( destColour) );
1116     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1117
1118     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
1119         rect.x+circleCenter.x,rect.y+circleCenter.y,
1120         rect.x+circleCenter.x,rect.y+circleCenter.y,
1121         nRadius,initialColour,destColour));
1122
1123     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1124     m_graphicContext->SetPen(m_pen);
1125     m_graphicContext->SetBrush(m_brush);
1126 }
1127
1128 void wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
1129                              wxCoord width, wxCoord height)
1130 {
1131     wxDCImpl::DoDrawCheckMark(x,y,width,height);
1132 }
1133
1134 #ifdef __WXMSW__
1135 wxRect wxGCDCImpl::MSWApplyGDIPlusTransform(const wxRect& r) const
1136 {
1137     wxGraphicsContext* const gc = GetGraphicsContext();
1138     wxCHECK_MSG( gc, r, wxT("Invalid wxGCDC") );
1139
1140     double x = 0,
1141            y = 0;
1142     gc->GetTransform().TransformPoint(&x, &y);
1143
1144     wxRect rect(r);
1145     rect.Offset(x, y);
1146
1147     return rect;
1148 }
1149 #endif // __WXMSW__
1150
1151 #endif // wxUSE_GRAPHICS_CONTEXT