src/common/dcgraph.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/graphcmn.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__
  34     #include "ApplicationServices/ApplicationServices.h"
  35 #endif
  36
  37 //-----------------------------------------------------------------------------
  38 // constants
  39 //-----------------------------------------------------------------------------
  40
  41 static const double RAD2DEG = 180.0 / M_PI;
  42
  43 //-----------------------------------------------------------------------------
  44 // Local functions
  45 //-----------------------------------------------------------------------------
  46
  47 static inline double DegToRad(double deg)
  48 {
  49     return (deg * M_PI) / 180.0;
  50 }
  51
  52 //-----------------------------------------------------------------------------
  53 // wxDC bridge class
  54 //-----------------------------------------------------------------------------
  55
  56 IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDC)
  57
  58 wxGCDC::wxGCDC(const wxWindowDC& dc) :
  59   wxDC( new wxGCDCImpl( this, dc ) )
  60 {
  61 }
  62
  63 wxGCDC::wxGCDC( const wxMemoryDC& dc) :
  64   wxDC( new wxGCDCImpl( this, dc ) )
  65 {
  66 }
  67
  68 wxGCDC::wxGCDC( const wxPrinterDC& dc) :
  69   wxDC( new wxGCDCImpl( this, dc ) )
  70 {
  71 }
  72
  73 wxGCDC::wxGCDC() :
  74   wxDC( new wxGCDCImpl( this ) )
  75 {
  76 }
  77
  78 wxGCDC::~wxGCDC()
  79 {
  80 }
  81
  82 wxGraphicsContext* wxGCDC::GetGraphicsContext()
  83 {
  84     if (!m_pimpl) return NULL;
  85     wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
  86     return gc_impl->GetGraphicsContext();
  87 }
  88
  89 void wxGCDC::SetGraphicsContext( wxGraphicsContext* ctx )
  90 {
  91     if (!m_pimpl) return;
  92     wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
  93     gc_impl->SetGraphicsContext( ctx );
  94 }
  95
  96 IMPLEMENT_ABSTRACT_CLASS(wxGCDCImpl, wxDCImpl)
  97
  98 wxGCDCImpl::wxGCDCImpl( wxDC *owner ) :
  99    wxDCImpl( owner )
 100 {
 101     Init();
 102 }
 103
 104 void wxGCDCImpl::SetGraphicsContext( wxGraphicsContext* ctx )
 105 {
 106     delete m_graphicContext;
 107     m_graphicContext = ctx;
 108     if ( m_graphicContext )
 109     {
 110         m_matrixOriginal = m_graphicContext->GetTransform();
 111         m_ok = true;
 112         // apply the stored transformations to the passed in context
 113         ComputeScaleAndOrigin();
 114         m_graphicContext->SetFont( m_font , m_textForegroundColour );
 115         m_graphicContext->SetPen( m_pen );
 116         m_graphicContext->SetBrush( m_brush);
 117     }
 118 }
 119
 120 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxWindowDC& dc ) :
 121    wxDCImpl( owner )
 122 {
 123     Init();
 124     SetGraphicsContext( wxGraphicsContext::Create(dc) );
 125     m_window = dc.GetWindow();
 126 }
 127
 128 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxMemoryDC& dc ) :
 129    wxDCImpl( owner )
 130 {
 131     Init();
 132     SetGraphicsContext( wxGraphicsContext::Create(dc) );
 133 }
 134
 135 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxPrinterDC& dc ) :
 136    wxDCImpl( owner )
 137 {
 138     Init();
 139     SetGraphicsContext( wxGraphicsContext::Create(dc) );
 140 }
 141
 142 void wxGCDCImpl::Init()
 143 {
 144     m_ok = false;
 145     m_colour = true;
 146     m_mm_to_pix_x = mm2pt;
 147     m_mm_to_pix_y = mm2pt;
 148
 149     m_pen = *wxBLACK_PEN;
 150     m_font = *wxNORMAL_FONT;
 151     m_brush = *wxWHITE_BRUSH;
 152
 153     m_graphicContext = NULL;
 154     m_logicalFunctionSupported = true;
 155 }
 156
 157
 158 wxGCDCImpl::~wxGCDCImpl()
 159 {
 160     delete m_graphicContext;
 161 }
 162
 163 void wxGCDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool WXUNUSED(useMask) )
 164 {
 165     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
 166     wxCHECK_RET( bmp.IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
 167
 168     if ( bmp.GetDepth() == 1 )
 169     {
 170         m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 171         m_graphicContext->SetBrush( wxBrush( m_textBackgroundColour , wxSOLID ) );
 172         m_graphicContext->DrawRectangle( x , y , bmp.GetWidth() , bmp.GetHeight() );
 173         m_graphicContext->SetBrush( wxBrush( m_textForegroundColour , wxSOLID ) );
 174         m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
 175         m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
 176         m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
 177     }
 178     else
 179         m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
 180 }
 181
 182 void wxGCDCImpl::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
 183 {
 184     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
 185     wxCHECK_RET( icon.IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
 186
 187     wxCoord w = icon.GetWidth();
 188     wxCoord h = icon.GetHeight();
 189
 190     m_graphicContext->DrawIcon( icon , x, y, w, h );
 191 }
 192
 193 bool wxGCDCImpl::StartDoc( const wxString& WXUNUSED(message) )
 194 {
 195     return true;
 196 }
 197
 198 void wxGCDCImpl::EndDoc()
 199 {
 200 }
 201
 202 void wxGCDCImpl::StartPage()
 203 {
 204 }
 205
 206 void wxGCDCImpl::EndPage()
 207 {
 208 }
 209
 210 void wxGCDCImpl::Flush()
 211 {
 212 #ifdef __WXOSX__
 213     CGContextFlush( (CGContextRef) m_graphicContext->GetNativeContext() );
 214 #endif
 215 }
 216
 217 void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
 218 {
 219     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
 220
 221     m_graphicContext->Clip( x, y, w, h );
 222     if ( m_clipping )
 223     {
 224         m_clipX1 = wxMax( m_clipX1, x );
 225         m_clipY1 = wxMax( m_clipY1, y );
 226         m_clipX2 = wxMin( m_clipX2, (x + w) );
 227         m_clipY2 = wxMin( m_clipY2, (y + h) );
 228     }
 229     else
 230     {
 231         m_clipping = true;
 232
 233         m_clipX1 = x;
 234         m_clipY1 = y;
 235         m_clipX2 = x + w;
 236         m_clipY2 = y + h;
 237     }
 238 }
 239
 240 void wxGCDCImpl::DoSetClippingRegionAsRegion( const wxRegion &region )
 241 {
 242     // region is in device coordinates
 243     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegionAsRegion - invalid DC") );
 244
 245     if (region.Empty())
 246     {
 247         //DestroyClippingRegion();
 248         return;
 249     }
 250
 251     wxRegion logRegion( region );
 252     wxCoord x, y, w, h;
 253
 254     logRegion.Offset( DeviceToLogicalX(0), DeviceToLogicalY(0) );
 255     logRegion.GetBox( x, y, w, h );
 256
 257     m_graphicContext->Clip( logRegion );
 258     if ( m_clipping )
 259     {
 260         m_clipX1 = wxMax( m_clipX1, x );
 261         m_clipY1 = wxMax( m_clipY1, y );
 262         m_clipX2 = wxMin( m_clipX2, (x + w) );
 263         m_clipY2 = wxMin( m_clipY2, (y + h) );
 264     }
 265     else
 266     {
 267         m_clipping = true;
 268
 269         m_clipX1 = x;
 270         m_clipY1 = y;
 271         m_clipX2 = x + w;
 272         m_clipY2 = y + h;
 273     }
 274 }
 275
 276 void wxGCDCImpl::DestroyClippingRegion()
 277 {
 278     m_graphicContext->ResetClip();
 279     // currently the clip eg of a window extends to the area between the scrollbars
 280     // so we must explicitely make sure it only covers the area we want it to draw
 281     int width, height ;
 282     GetOwner()->GetSize( &width , &height ) ;
 283     m_graphicContext->Clip( DeviceToLogicalX(0) , DeviceToLogicalY(0) , DeviceToLogicalXRel(width), DeviceToLogicalYRel(height) );
 284
 285     m_graphicContext->SetPen( m_pen );
 286     m_graphicContext->SetBrush( m_brush );
 287
 288     m_clipping = false;
 289 }
 290
 291 void wxGCDCImpl::DoGetSizeMM( int* width, int* height ) const
 292 {
 293     int w = 0, h = 0;
 294
 295     GetOwner()->GetSize( &w, &h );
 296     if (width)
 297         *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
 298     if (height)
 299         *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
 300 }
 301
 302 void wxGCDCImpl::SetTextForeground( const wxColour &col )
 303 {
 304     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 305
 306     if ( col != m_textForegroundColour )
 307     {
 308         m_textForegroundColour = col;
 309         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 310     }
 311 }
 312
 313 void wxGCDCImpl::SetTextBackground( const wxColour &col )
 314 {
 315     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 316
 317     m_textBackgroundColour = col;
 318 }
 319
 320 void wxGCDCImpl::SetMapMode( int mode )
 321 {
 322     switch (mode)
 323     {
 324     case wxMM_TWIPS:
 325         SetLogicalScale( twips2mm * m_mm_to_pix_x, twips2mm * m_mm_to_pix_y );
 326         break;
 327
 328     case wxMM_POINTS:
 329         SetLogicalScale( pt2mm * m_mm_to_pix_x, pt2mm * m_mm_to_pix_y );
 330         break;
 331
 332     case wxMM_METRIC:
 333         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 334         break;
 335
 336     case wxMM_LOMETRIC:
 337         SetLogicalScale( m_mm_to_pix_x / 10.0, m_mm_to_pix_y / 10.0 );
 338         break;
 339
 340     case wxMM_TEXT:
 341     default:
 342         SetLogicalScale( 1.0, 1.0 );
 343         break;
 344     }
 345
 346     ComputeScaleAndOrigin();
 347 }
 348
 349 wxSize wxGCDCImpl::GetPPI() const
 350 {
 351     return wxSize(72, 72);
 352 }
 353
 354 int wxGCDCImpl::GetDepth() const
 355 {
 356     return 32;
 357 }
 358
 359 void wxGCDCImpl::ComputeScaleAndOrigin()
 360 {
 361     wxDCImpl::ComputeScaleAndOrigin();
 362
 363     if ( m_graphicContext )
 364     {
 365         m_matrixCurrent = m_graphicContext->CreateMatrix();
 366
 367         // the logical origin sets the origin to have new coordinates
 368         m_matrixCurrent.Translate( m_deviceOriginX - m_logicalOriginX * m_signX * m_scaleX,
 369                                    m_deviceOriginY-m_logicalOriginY * m_signY * m_scaleY);
 370
 371         m_matrixCurrent.Scale( m_scaleX * m_signX, m_scaleY * m_signY );
 372
 373         m_graphicContext->SetTransform( m_matrixOriginal );
 374         m_graphicContext->ConcatTransform( m_matrixCurrent );
 375     }
 376 }
 377
 378 void wxGCDCImpl::SetPalette( const wxPalette& WXUNUSED(palette) )
 379 {
 380
 381 }
 382
 383 void wxGCDCImpl::SetBackgroundMode( int mode )
 384 {
 385     m_backgroundMode = mode;
 386 }
 387
 388 void wxGCDCImpl::SetFont( const wxFont &font )
 389 {
 390     m_font = font;
 391     if ( m_graphicContext )
 392     {
 393         wxFont f = font;
 394         if ( f.IsOk() )
 395             f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
 396         m_graphicContext->SetFont( f, m_textForegroundColour );
 397     }
 398 }
 399
 400 void wxGCDCImpl::SetPen( const wxPen &pen )
 401 {
 402     if ( m_pen == pen )
 403         return;
 404
 405     m_pen = pen;
 406     if ( m_graphicContext )
 407     {
 408         m_graphicContext->SetPen( m_pen );
 409     }
 410 }
 411
 412 void wxGCDCImpl::SetBrush( const wxBrush &brush )
 413 {
 414     if (m_brush == brush)
 415         return;
 416
 417     m_brush = brush;
 418     if ( m_graphicContext )
 419     {
 420         m_graphicContext->SetBrush( m_brush );
 421     }
 422 }
 423
 424 void wxGCDCImpl::SetBackground( const wxBrush &brush )
 425 {
 426     if (m_backgroundBrush == brush)
 427         return;
 428
 429     m_backgroundBrush = brush;
 430     if (!m_backgroundBrush.IsOk())
 431         return;
 432 }
 433
 434 void wxGCDCImpl::SetLogicalFunction( int function )
 435 {
 436     if (m_logicalFunction == function)
 437         return;
 438
 439     m_logicalFunction = function;
 440     if ( m_graphicContext->SetLogicalFunction( function ) )
 441         m_logicalFunctionSupported=true;
 442     else
 443         m_logicalFunctionSupported=false;
 444 }
 445
 446 bool wxGCDCImpl::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 447                          const wxColour& WXUNUSED(col), int WXUNUSED(style))
 448 {
 449     return false;
 450 }
 451
 452 bool wxGCDCImpl::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 453 {
 454     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 455     return false;
 456 }
 457
 458 void wxGCDCImpl::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 459 {
 460     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 461
 462     if ( !m_logicalFunctionSupported )
 463         return;
 464
 465     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 466
 467     CalcBoundingBox(x1, y1);
 468     CalcBoundingBox(x2, y2);
 469 }
 470
 471 void wxGCDCImpl::DoCrossHair( wxCoord x, wxCoord y )
 472 {
 473     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 474
 475     if ( !m_logicalFunctionSupported )
 476         return;
 477
 478     int w = 0, h = 0;
 479
 480     GetOwner()->GetSize( &w, &h );
 481
 482     m_graphicContext->StrokeLine(0,y,w,y);
 483     m_graphicContext->StrokeLine(x,0,x,h);
 484
 485     CalcBoundingBox(0, 0);
 486     CalcBoundingBox(0+w, 0+h);
 487 }
 488
 489 void wxGCDCImpl::DoDrawArc( wxCoord x1, wxCoord y1,
 490                         wxCoord x2, wxCoord y2,
 491                         wxCoord xc, wxCoord yc )
 492 {
 493     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 494
 495     if ( !m_logicalFunctionSupported )
 496         return;
 497
 498     double dx = x1 - xc;
 499     double dy = y1 - yc;
 500     double radius = sqrt((double)(dx * dx + dy * dy));
 501     wxCoord rad = (wxCoord)radius;
 502     double sa, ea;
 503     if (x1 == x2 && y1 == y2)
 504     {
 505         sa = 0.0;
 506         ea = 360.0;
 507     }
 508     else if (radius == 0.0)
 509     {
 510         sa = ea = 0.0;
 511     }
 512     else
 513     {
 514         sa = (x1 - xc == 0) ?
 515      (y1 - yc < 0) ? 90.0 : -90.0 :
 516              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 517         ea = (x2 - xc == 0) ?
 518      (y2 - yc < 0) ? 90.0 : -90.0 :
 519              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 520     }
 521
 522     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 523
 524     wxGraphicsPath path = m_graphicContext->CreatePath();
 525     if ( fill && ((x1!=x2)||(y1!=y2)) )
 526         path.MoveToPoint( xc, yc );
 527     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 528     // get clockwise angles
 529     path.AddArc( xc, yc , rad , DegToRad(-sa) , DegToRad(-ea), false );
 530     if ( fill && ((x1!=x2)||(y1!=y2)) )
 531         path.AddLineToPoint( xc, yc );
 532     m_graphicContext->DrawPath(path);
 533 }
 534
 535 void wxGCDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 536                                 double sa, double ea )
 537 {
 538     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 539
 540     if ( !m_logicalFunctionSupported )
 541         return;
 542
 543     m_graphicContext->PushState();
 544     m_graphicContext->Translate(x+w/2.0,y+h/2.0);
 545     wxDouble factor = ((wxDouble) w) / h;
 546     m_graphicContext->Scale( factor , 1.0);
 547
 548     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 549     // get clockwise angles
 550     if ( m_brush.GetStyle() != wxTRANSPARENT )
 551     {
 552         wxGraphicsPath path = m_graphicContext->CreatePath();
 553         path.MoveToPoint( 0, 0 );
 554         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 555         path.AddLineToPoint( 0, 0 );
 556         m_graphicContext->FillPath( path );
 557
 558         path = m_graphicContext->CreatePath();
 559         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 560         m_graphicContext->StrokePath( path );
 561     }
 562     else
 563     {
 564         wxGraphicsPath path = m_graphicContext->CreatePath();
 565         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 566         m_graphicContext->DrawPath( path );
 567     }
 568
 569     m_graphicContext->PopState();
 570 }
 571
 572 void wxGCDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
 573 {
 574     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 575
 576     DoDrawLine( x , y , x + 1 , y + 1 );
 577 }
 578
 579 void wxGCDCImpl::DoDrawLines(int n, wxPoint points[],
 580                          wxCoord xoffset, wxCoord yoffset)
 581 {
 582     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 583
 584     if ( !m_logicalFunctionSupported )
 585         return;
 586
 587     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 588     for( int i = 0; i < n; ++i)
 589     {
 590         pointsD[i].m_x = points[i].x + xoffset;
 591         pointsD[i].m_y = points[i].y + yoffset;
 592     }
 593
 594     m_graphicContext->StrokeLines( n , pointsD);
 595     delete[] pointsD;
 596 }
 597
 598 #if wxUSE_SPLINES
 599 void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
 600 {
 601     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 602
 603     if ( !m_logicalFunctionSupported )
 604         return;
 605
 606     wxGraphicsPath path = m_graphicContext->CreatePath();
 607
 608     wxPointList::compatibility_iterator node = points->GetFirst();
 609     if (node == wxPointList::compatibility_iterator())
 610         // empty list
 611         return;
 612
 613     wxPoint *p = node->GetData();
 614
 615     wxCoord x1 = p->x;
 616     wxCoord y1 = p->y;
 617
 618     node = node->GetNext();
 619     p = node->GetData();
 620
 621     wxCoord x2 = p->x;
 622     wxCoord y2 = p->y;
 623     wxCoord cx1 = ( x1 + x2 ) / 2;
 624     wxCoord cy1 = ( y1 + y2 ) / 2;
 625
 626     path.MoveToPoint( x1 , y1 );
 627     path.AddLineToPoint( cx1 , cy1 );
 628 #if !wxUSE_STL
 629
 630     while ((node = node->GetNext()) != NULL)
 631 #else
 632
 633     while ((node = node->GetNext()))
 634 #endif // !wxUSE_STL
 635
 636     {
 637         p = node->GetData();
 638         x1 = x2;
 639         y1 = y2;
 640         x2 = p->x;
 641         y2 = p->y;
 642         wxCoord cx4 = (x1 + x2) / 2;
 643         wxCoord cy4 = (y1 + y2) / 2;
 644
 645         path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 646
 647         cx1 = cx4;
 648         cy1 = cy4;
 649     }
 650
 651     path.AddLineToPoint( x2 , y2 );
 652
 653     m_graphicContext->StrokePath( path );
 654 }
 655 #endif // wxUSE_SPLINES
 656
 657 void wxGCDCImpl::DoDrawPolygon( int n, wxPoint points[],
 658                             wxCoord xoffset, wxCoord yoffset,
 659                             int fillStyle )
 660 {
 661     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 662
 663     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 664         return;
 665     if ( !m_logicalFunctionSupported )
 666         return;
 667
 668     bool closeIt = false;
 669     if (points[n-1] != points[0])
 670         closeIt = true;
 671
 672     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 673     for( int i = 0; i < n; ++i)
 674     {
 675         pointsD[i].m_x = points[i].x + xoffset;
 676         pointsD[i].m_y = points[i].y + yoffset;
 677     }
 678     if ( closeIt )
 679         pointsD[n] = pointsD[0];
 680
 681     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 682     delete[] pointsD;
 683 }
 684
 685 void wxGCDCImpl::DoDrawPolyPolygon(int n,
 686                                int count[],
 687                                wxPoint points[],
 688                                wxCoord xoffset,
 689                                wxCoord yoffset,
 690                                int fillStyle)
 691 {
 692     wxASSERT(n > 1);
 693     wxGraphicsPath path = m_graphicContext->CreatePath();
 694
 695     int i = 0;
 696     for ( int j = 0; j < n; ++j)
 697     {
 698         wxPoint start = points[i];
 699         path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
 700         ++i;
 701         int l = count[j];
 702         for ( int k = 1; k < l; ++k)
 703         {
 704             path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
 705             ++i;
 706         }
 707         // close the polygon
 708         if ( start != points[i-1])
 709             path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
 710     }
 711     m_graphicContext->DrawPath( path , fillStyle);
 712 }
 713
 714 void wxGCDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 715 {
 716     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 717
 718     if ( !m_logicalFunctionSupported )
 719         return;
 720
 721     // CMB: draw nothing if transformed w or h is 0
 722     if (w == 0 || h == 0)
 723         return;
 724
 725     if ( m_graphicContext->ShouldOffset() )
 726     {
 727         // if we are offsetting the entire rectangle is moved 0.5, so the
 728         // border line gets off by 1
 729         w -= 1;
 730         h -= 1;
 731     }
 732     m_graphicContext->DrawRectangle(x,y,w,h);
 733 }
 734
 735 void wxGCDCImpl::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 736                                     wxCoord w, wxCoord h,
 737                                     double radius)
 738 {
 739     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 740
 741     if ( !m_logicalFunctionSupported )
 742         return;
 743
 744     if (radius < 0.0)
 745         radius = - radius * ((w < h) ? w : h);
 746
 747     // CMB: draw nothing if transformed w or h is 0
 748     if (w == 0 || h == 0)
 749         return;
 750
 751     if ( m_graphicContext->ShouldOffset() )
 752     {
 753         // if we are offsetting the entire rectangle is moved 0.5, so the
 754         // border line gets off by 1
 755         w -= 1;
 756         h -= 1;
 757     }
 758     m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
 759 }
 760
 761 void wxGCDCImpl::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 762 {
 763     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 764
 765     if ( !m_logicalFunctionSupported )
 766         return;
 767
 768     if ( m_graphicContext->ShouldOffset() )
 769     {
 770         // if we are offsetting the entire rectangle is moved 0.5, so the
 771         // border line gets off by 1
 772         w -= 1;
 773         h -= 1;
 774     }
 775     m_graphicContext->DrawEllipse(x,y,w,h);
 776 }
 777
 778 bool wxGCDCImpl::CanDrawBitmap() const
 779 {
 780     return true;
 781 }
 782
 783 bool wxGCDCImpl::DoBlit(
 784     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 785     wxDC *source, wxCoord xsrc, wxCoord ysrc, int logical_func , bool useMask,
 786     wxCoord xsrcMask, wxCoord ysrcMask )
 787 {
 788     return DoStretchBlit( xdest, ydest, width, height,
 789         source, xsrc, ysrc, width, height, logical_func, useMask,
 790         xsrcMask,ysrcMask );
 791 }
 792
 793 bool wxGCDCImpl::DoStretchBlit(
 794     wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
 795     wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
 796     int logical_func , bool WXUNUSED(useMask),
 797     wxCoord xsrcMask, wxCoord ysrcMask )
 798 {
 799     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
 800     wxCHECK_MSG( source->IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid source DC") );
 801
 802     if ( logical_func == wxNO_OP )
 803         return true;
 804     else if ( !m_graphicContext->SetLogicalFunction( logical_func ) )
 805
 806     {
 807         wxFAIL_MSG( wxT("Blitting is only supported with wxCOPY logical operation.") );
 808         return false;
 809     }
 810
 811     if (xsrcMask == -1 && ysrcMask == -1)
 812     {
 813         xsrcMask = xsrc;
 814         ysrcMask = ysrc;
 815     }
 816
 817     wxRect subrect(source->LogicalToDeviceX(xsrc),
 818                    source->LogicalToDeviceY(ysrc),
 819                    source->LogicalToDeviceXRel(srcWidth),
 820                    source->LogicalToDeviceYRel(srcHeight));
 821
 822     // if needed clip the subrect down to the size of the source DC
 823     wxCoord sw, sh;
 824     source->GetSize(&sw, &sh);
 825     sw = source->LogicalToDeviceXRel(sw);
 826     sh = source->LogicalToDeviceYRel(sh);
 827     if (subrect.x + subrect.width > sw)
 828         subrect.width = sw - subrect.x;
 829     if (subrect.y + subrect.height > sh)
 830         subrect.height = sh - subrect.y;
 831
 832     wxBitmap blit = source->GetAsBitmap( &subrect );
 833
 834     if ( blit.IsOk() )
 835     {
 836         m_graphicContext->DrawBitmap( blit, xdest, ydest,
 837                                       dstWidth, dstHeight);
 838     }
 839     else
 840     {
 841         wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
 842         return false;
 843     }
 844
 845     // reset logical function
 846     m_graphicContext->SetLogicalFunction( m_logicalFunction );
 847
 848     return true;
 849 }
 850
 851 void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 852                                double angle)
 853 {
 854     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 855
 856     if ( str.length() == 0 )
 857         return;
 858     if ( !m_logicalFunctionSupported )
 859         return;
 860
 861     if ( m_backgroundMode == wxTRANSPARENT )
 862         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 863     else
 864         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ), m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 865 }
 866
 867 void wxGCDCImpl::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 868 {
 869     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 870
 871     if ( str.length() == 0 )
 872         return;
 873
 874     if ( !m_logicalFunctionSupported )
 875         return;
 876
 877     if ( m_backgroundMode == wxTRANSPARENT )
 878         m_graphicContext->DrawText( str, x ,y);
 879     else
 880         m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 881 }
 882
 883 bool wxGCDCImpl::CanGetTextExtent() const
 884 {
 885     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 886
 887     return true;
 888 }
 889
 890 void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
 891                               wxCoord *descent, wxCoord *externalLeading ,
 892                               const wxFont *theFont ) const
 893 {
 894     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 895
 896     if ( theFont )
 897     {
 898         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
 899     }
 900
 901     wxDouble h , d , e , w;
 902
 903     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
 904
 905     if ( height )
 906         *height = (wxCoord)(h+0.5);
 907     if ( descent )
 908         *descent = (wxCoord)(d+0.5);
 909     if ( externalLeading )
 910         *externalLeading = (wxCoord)(e+0.5);
 911     if ( width )
 912         *width = (wxCoord)(w+0.5);
 913
 914     if ( theFont )
 915     {
 916         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 917     }
 918 }
 919
 920 bool wxGCDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 921 {
 922     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
 923     widths.Clear();
 924     widths.Add(0,text.Length());
 925     if ( text.IsEmpty() )
 926         return true;
 927
 928     wxArrayDouble widthsD;
 929
 930     m_graphicContext->GetPartialTextExtents( text, widthsD );
 931     for ( size_t i = 0; i < widths.GetCount(); ++i )
 932         widths[i] = (wxCoord)(widthsD[i] + 0.5);
 933
 934     return true;
 935 }
 936
 937 wxCoord wxGCDCImpl::GetCharWidth(void) const
 938 {
 939     wxCoord width;
 940     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
 941
 942     return width;
 943 }
 944
 945 wxCoord wxGCDCImpl::GetCharHeight(void) const
 946 {
 947     wxCoord height;
 948     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
 949
 950     return height;
 951 }
 952
 953 void wxGCDCImpl::Clear(void)
 954 {
 955     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::Clear - invalid DC") );
 956     // TODO better implementation / incorporate size info into wxGCDC or context
 957     m_graphicContext->SetBrush( m_backgroundBrush );
 958     wxPen p = *wxTRANSPARENT_PEN;
 959     m_graphicContext->SetPen( p );
 960     DoDrawRectangle( 0, 0, 32000 , 32000 );
 961     m_graphicContext->SetPen( m_pen );
 962     m_graphicContext->SetBrush( m_brush );
 963 }
 964
 965 void wxGCDCImpl::DoGetSize(int *width, int *height) const
 966 {
 967     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetSize - invalid DC") );
 968     wxDouble w,h;
 969     m_graphicContext->GetSize( &w, &h );
 970     if ( height )
 971         *height = (int) (h+0.5);
 972     if ( width )
 973         *width = (int) (w+0.5);
 974 }
 975
 976 void wxGCDCImpl::DoGradientFillLinear(const wxRect& rect,
 977                                   const wxColour& initialColour,
 978                                   const wxColour& destColour,
 979                                   wxDirection nDirection )
 980 {
 981     wxPoint start;
 982     wxPoint end;
 983     switch( nDirection)
 984     {
 985     case wxWEST :
 986         start = rect.GetRightBottom();
 987         start.x++;
 988         end = rect.GetLeftBottom();
 989         break;
 990     case wxEAST :
 991         start = rect.GetLeftBottom();
 992         end = rect.GetRightBottom();
 993         end.x++;
 994         break;
 995     case wxNORTH :
 996         start = rect.GetLeftBottom();
 997         start.y++;
 998         end = rect.GetLeftTop();
 999         break;
1000     case wxSOUTH :
1001         start = rect.GetLeftTop();
1002         end = rect.GetLeftBottom();
1003         end.y++;
1004         break;
1005     default :
1006         break;
1007     }
1008
1009     if (rect.width == 0 || rect.height == 0)
1010         return;
1011
1012     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
1013         start.x,start.y,end.x,end.y, initialColour, destColour));
1014     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1015     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1016     m_graphicContext->SetPen(m_pen);
1017 }
1018
1019 void wxGCDCImpl::DoGradientFillConcentric(const wxRect& rect,
1020                                       const wxColour& initialColour,
1021                                       const wxColour& destColour,
1022                                       const wxPoint& circleCenter)
1023 {
1024     //Radius
1025     wxInt32 cx = rect.GetWidth() / 2;
1026     wxInt32 cy = rect.GetHeight() / 2;
1027     wxInt32 nRadius;
1028     if (cx < cy)
1029         nRadius = cx;
1030     else
1031         nRadius = cy;
1032
1033     // make sure the background is filled (todo move into specific platform implementation ?)
1034     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1035     m_graphicContext->SetBrush( wxBrush( destColour) );
1036     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1037
1038     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
1039         rect.x+circleCenter.x,rect.y+circleCenter.y,
1040         rect.x+circleCenter.x,rect.y+circleCenter.y,
1041         nRadius,initialColour,destColour));
1042
1043     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1044     m_graphicContext->SetPen(m_pen);
1045 }
1046
1047 void wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
1048                              wxCoord width, wxCoord height)
1049 {
1050     wxDCImpl::DoDrawCheckMark(x,y,width,height);
1051 }
1052
1053 #endif // wxUSE_GRAPHICS_CONTEXT