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
  23 #ifndef WX_PRECOMP
  24     #include "wx/icon.h"
  25     #include "wx/bitmap.h"
  26     #include "wx/dcmemory.h"
  27     #include "wx/region.h"
  28 #endif
  29
  30 #ifndef wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
  31     #define wxMAC_USE_CORE_GRAPHICS_BLEND_MODES 0
  32 #endif
  33
  34 //-----------------------------------------------------------------------------
  35 // constants
  36 //-----------------------------------------------------------------------------
  37
  38 static const double RAD2DEG = 180.0 / M_PI;
  39
  40 //-----------------------------------------------------------------------------
  41 // Local functions
  42 //-----------------------------------------------------------------------------
  43
  44 static inline double DegToRad(double deg)
  45 {
  46     return (deg * M_PI) / 180.0;
  47 }
  48
  49 //-----------------------------------------------------------------------------
  50 // wxDC bridge class
  51 //-----------------------------------------------------------------------------
  52
  53 #ifdef __WXMAC__
  54 IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDCBase)
  55 #else
  56 IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDC)
  57 #endif
  58
  59 wxGCDC::wxGCDC()
  60 {
  61     Init();
  62 }
  63
  64 void wxGCDC::SetGraphicsContext( wxGraphicsContext* ctx )
  65 {
  66     delete m_graphicContext;
  67     m_graphicContext = ctx;
  68     if ( m_graphicContext )
  69     {
  70         m_matrixOriginal = m_graphicContext->GetTransform();
  71         m_ok = true;
  72         // apply the stored transformations to the passed in context
  73         ComputeScaleAndOrigin();
  74         m_graphicContext->SetFont( m_font , m_textForegroundColour );
  75         m_graphicContext->SetPen( m_pen );
  76         m_graphicContext->SetBrush( m_brush);
  77     }
  78 }
  79
  80 wxGCDC::wxGCDC(const wxWindowDC& dc)
  81 {
  82     Init();
  83     SetGraphicsContext( wxGraphicsContext::Create(dc) );
  84 }
  85
  86 void wxGCDC::Init()
  87 {
  88     m_ok = false;
  89     m_colour = true;
  90     m_mm_to_pix_x = mm2pt;
  91     m_mm_to_pix_y = mm2pt;
  92
  93     m_pen = *wxBLACK_PEN;
  94     m_font = *wxNORMAL_FONT;
  95     m_brush = *wxWHITE_BRUSH;
  96
  97     m_graphicContext = NULL;
  98 }
  99
 100
 101 wxGCDC::~wxGCDC()
 102 {
 103     delete m_graphicContext;
 104 }
 105
 106 void wxGCDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool WXUNUSED(useMask) )
 107 {
 108     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
 109     wxCHECK_RET( bmp.Ok(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
 110
 111     if ( bmp.GetDepth() == 1 )
 112     {
 113         m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 114         m_graphicContext->SetBrush( wxBrush( m_textBackgroundColour , wxSOLID ) );
 115         m_graphicContext->DrawRectangle( x , y , bmp.GetWidth() , bmp.GetHeight() );
 116         m_graphicContext->SetBrush( wxBrush( m_textForegroundColour , wxSOLID ) );
 117         m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
 118         m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
 119         m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
 120     }
 121     else
 122         m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
 123 }
 124
 125 void wxGCDC::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
 126 {
 127     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
 128     wxCHECK_RET( icon.Ok(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
 129
 130     wxCoord w = icon.GetWidth();
 131     wxCoord h = icon.GetHeight();
 132
 133     m_graphicContext->DrawIcon( icon , x, y, w, h );
 134 }
 135
 136 void wxGCDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
 137 {
 138     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
 139
 140     m_graphicContext->Clip( x, y, w, h );
 141     if ( m_clipping )
 142     {
 143         m_clipX1 = wxMax( m_clipX1, x );
 144         m_clipY1 = wxMax( m_clipY1, y );
 145         m_clipX2 = wxMin( m_clipX2, (x + w) );
 146         m_clipY2 = wxMin( m_clipY2, (y + h) );
 147     }
 148     else
 149     {
 150         m_clipping = true;
 151
 152         m_clipX1 = x;
 153         m_clipY1 = y;
 154         m_clipX2 = x + w;
 155         m_clipY2 = y + h;
 156     }
 157 }
 158
 159 void wxGCDC::DoSetClippingRegionAsRegion( const wxRegion &region )
 160 {
 161     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoSetClippingRegionAsRegion - invalid DC") );
 162
 163     if (region.Empty())
 164     {
 165         DestroyClippingRegion();
 166         return;
 167     }
 168
 169     wxCoord x, y, w, h;
 170     region.GetBox( x, y, w, h );
 171
 172     m_graphicContext->Clip( region );
 173     if ( m_clipping )
 174     {
 175         m_clipX1 = wxMax( m_clipX1, x );
 176         m_clipY1 = wxMax( m_clipY1, y );
 177         m_clipX2 = wxMin( m_clipX2, (x + w) );
 178         m_clipY2 = wxMin( m_clipY2, (y + h) );
 179     }
 180     else
 181     {
 182         m_clipping = true;
 183
 184         m_clipX1 = x;
 185         m_clipY1 = y;
 186         m_clipX2 = x + w;
 187         m_clipY2 = y + h;
 188     }
 189 }
 190
 191 void wxGCDC::DestroyClippingRegion()
 192 {
 193     m_graphicContext->ResetClip();
 194     m_graphicContext->SetPen( m_pen );
 195     m_graphicContext->SetBrush( m_brush );
 196
 197     m_clipping = false;
 198 }
 199
 200 void wxGCDC::DoGetSizeMM( int* width, int* height ) const
 201 {
 202     int w = 0, h = 0;
 203
 204     GetSize( &w, &h );
 205     if (width)
 206         *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
 207     if (height)
 208         *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
 209 }
 210
 211 void wxGCDC::SetTextForeground( const wxColour &col )
 212 {
 213     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 214
 215     if ( col != m_textForegroundColour )
 216     {
 217         m_textForegroundColour = col;
 218         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 219     }
 220 }
 221
 222 void wxGCDC::SetTextBackground( const wxColour &col )
 223 {
 224     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 225
 226     m_textBackgroundColour = col;
 227 }
 228
 229 void wxGCDC::SetMapMode( int mode )
 230 {
 231     switch (mode)
 232     {
 233     case wxMM_TWIPS:
 234         SetLogicalScale( twips2mm * m_mm_to_pix_x, twips2mm * m_mm_to_pix_y );
 235         break;
 236
 237     case wxMM_POINTS:
 238         SetLogicalScale( pt2mm * m_mm_to_pix_x, pt2mm * m_mm_to_pix_y );
 239         break;
 240
 241     case wxMM_METRIC:
 242         SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
 243         break;
 244
 245     case wxMM_LOMETRIC:
 246         SetLogicalScale( m_mm_to_pix_x / 10.0, m_mm_to_pix_y / 10.0 );
 247         break;
 248
 249     case wxMM_TEXT:
 250     default:
 251         SetLogicalScale( 1.0, 1.0 );
 252         break;
 253     }
 254
 255     ComputeScaleAndOrigin();
 256 }
 257
 258 void wxGCDC::SetUserScale( double x, double y )
 259 {
 260     // allow negative ? -> no
 261
 262     m_userScaleX = x;
 263     m_userScaleY = y;
 264     ComputeScaleAndOrigin();
 265 }
 266
 267 void wxGCDC::SetLogicalScale( double x, double y )
 268 {
 269     // allow negative ?
 270     m_logicalScaleX = x;
 271     m_logicalScaleY = y;
 272     ComputeScaleAndOrigin();
 273 }
 274
 275 void wxGCDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 276 {
 277     m_logicalOriginX = x * m_signX;   // is this still correct ?
 278     m_logicalOriginY = y * m_signY;
 279     ComputeScaleAndOrigin();
 280 }
 281
 282 void wxGCDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 283 {
 284     m_deviceOriginX = x;
 285     m_deviceOriginY = y;
 286     ComputeScaleAndOrigin();
 287 }
 288
 289 void wxGCDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 290 {
 291     m_signX = (xLeftRight ?  1 : -1);
 292     m_signY = (yBottomUp ? -1 :  1);
 293     ComputeScaleAndOrigin();
 294 }
 295
 296 wxSize wxGCDC::GetPPI() const
 297 {
 298     return wxSize(72, 72);
 299 }
 300
 301 int wxGCDC::GetDepth() const
 302 {
 303     return 32;
 304 }
 305
 306 void wxGCDC::ComputeScaleAndOrigin()
 307 {
 308     m_scaleX = m_logicalScaleX * m_userScaleX;
 309     m_scaleY = m_logicalScaleY * m_userScaleY;
 310
 311     if ( m_graphicContext )
 312     {
 313         m_matrixCurrent = m_graphicContext->CreateMatrix();
 314         m_matrixCurrent.Translate( m_deviceOriginX, m_deviceOriginY );
 315         m_matrixCurrent.Scale( m_scaleX, m_scaleY );
 316         // the logical origin sets the origin to have new coordinates
 317         m_matrixCurrent.Translate( -m_logicalOriginX, -m_logicalOriginY );
 318
 319         m_graphicContext->SetTransform( m_matrixOriginal );
 320         m_graphicContext->ConcatTransform( m_matrixCurrent );
 321     }
 322 }
 323
 324 void wxGCDC::SetPalette( const wxPalette& WXUNUSED(palette) )
 325 {
 326
 327 }
 328
 329 void wxGCDC::SetBackgroundMode( int mode )
 330 {
 331     m_backgroundMode = mode;
 332 }
 333
 334 void wxGCDC::SetFont( const wxFont &font )
 335 {
 336     m_font = font;
 337     if ( m_graphicContext )
 338     {
 339         wxFont f = font;
 340         if ( f.Ok() )
 341             f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
 342         m_graphicContext->SetFont( f, m_textForegroundColour );
 343     }
 344 }
 345
 346 void wxGCDC::SetPen( const wxPen &pen )
 347 {
 348     if ( m_pen == pen )
 349         return;
 350
 351     m_pen = pen;
 352     if ( m_graphicContext )
 353     {
 354         m_graphicContext->SetPen( m_pen );
 355     }
 356 }
 357
 358 void wxGCDC::SetBrush( const wxBrush &brush )
 359 {
 360     if (m_brush == brush)
 361         return;
 362
 363     m_brush = brush;
 364     if ( m_graphicContext )
 365     {
 366         m_graphicContext->SetBrush( m_brush );
 367     }
 368 }
 369
 370 void wxGCDC::SetBackground( const wxBrush &brush )
 371 {
 372     if (m_backgroundBrush == brush)
 373         return;
 374
 375     m_backgroundBrush = brush;
 376     if (!m_backgroundBrush.Ok())
 377         return;
 378 }
 379
 380 void wxGCDC::SetLogicalFunction( int function )
 381 {
 382     if (m_logicalFunction == function)
 383         return;
 384
 385     m_logicalFunction = function;
 386 #if wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
 387
 388     CGContextRef cgContext = ((wxCairoContext*)(m_graphicContext))->GetNativeContext();
 389     if ( m_logicalFunction == wxCOPY )
 390         CGContextSetBlendMode( cgContext, kCGBlendModeNormal );
 391     else if ( m_logicalFunction == wxINVERT )
 392         CGContextSetBlendMode( cgContext, kCGBlendModeExclusion );
 393     else
 394         CGContextSetBlendMode( cgContext, kCGBlendModeNormal );
 395 #endif
 396
 397 }
 398
 399 bool wxGCDC::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 400                          const wxColour& WXUNUSED(col), int WXUNUSED(style))
 401 {
 402     return false;
 403 }
 404
 405 bool wxGCDC::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 406 {
 407     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 408     return false;
 409 }
 410
 411 void wxGCDC::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 412 {
 413     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 414
 415 #if !wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
 416
 417     if ( m_logicalFunction != wxCOPY )
 418         return;
 419 #endif
 420
 421     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 422
 423     CalcBoundingBox(x1, y1);
 424     CalcBoundingBox(x2, y2);
 425 }
 426
 427 void wxGCDC::DoCrossHair( wxCoord x, wxCoord y )
 428 {
 429     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 430
 431     if ( m_logicalFunction != wxCOPY )
 432         return;
 433
 434     int w = 0, h = 0;
 435
 436     GetSize( &w, &h );
 437
 438     m_graphicContext->StrokeLine(0,y,w,y);
 439     m_graphicContext->StrokeLine(x,0,x,h);
 440
 441     CalcBoundingBox(0, 0);
 442     CalcBoundingBox(0+w, 0+h);
 443 }
 444
 445 void wxGCDC::DoDrawArc( wxCoord x1, wxCoord y1,
 446                         wxCoord x2, wxCoord y2,
 447                         wxCoord xc, wxCoord yc )
 448 {
 449     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 450
 451     if ( m_logicalFunction != wxCOPY )
 452         return;
 453
 454     double dx = x1 - xc;
 455     double dy = y1 - yc;
 456     double radius = sqrt((double)(dx * dx + dy * dy));
 457     wxCoord rad = (wxCoord)radius;
 458     double sa, ea;
 459     if (x1 == x2 && y1 == y2)
 460     {
 461         sa = 0.0;
 462         ea = 360.0;
 463     }
 464     else if (radius == 0.0)
 465     {
 466         sa = ea = 0.0;
 467     }
 468     else
 469     {
 470         sa = (x1 - xc == 0) ?
 471      (y1 - yc < 0) ? 90.0 : -90.0 :
 472              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 473         ea = (x2 - xc == 0) ?
 474      (y2 - yc < 0) ? 90.0 : -90.0 :
 475              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 476     }
 477
 478     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 479
 480     wxGraphicsPath path = m_graphicContext->CreatePath();
 481     if ( fill && ((x1!=x2)||(y1!=y2)) )
 482         path.MoveToPoint( xc, yc );
 483     path.AddArc( xc, yc , rad , DegToRad(sa) , DegToRad(ea), false );
 484     if ( fill && ((x1!=x2)||(y1!=y2)) )
 485         path.AddLineToPoint( xc, yc );
 486     m_graphicContext->DrawPath(path);
 487 }
 488
 489 void wxGCDC::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 490                                 double sa, double ea )
 491 {
 492     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 493
 494     if ( m_logicalFunction != wxCOPY )
 495         return;
 496
 497     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 498
 499     wxGraphicsPath path = m_graphicContext->CreatePath();
 500     m_graphicContext->PushState();
 501     m_graphicContext->Translate(x+w/2,y+h/2);
 502     wxDouble factor = ((wxDouble) w) / h;
 503     m_graphicContext->Scale( factor , 1.0);
 504     if ( fill && (sa!=ea) )
 505         path.MoveToPoint(0,0);
 506     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 507     // get clockwise angles
 508     path.AddArc( 0, 0, h/2 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 509     if ( fill && (sa!=ea) )
 510         path.AddLineToPoint(0,0);
 511     m_graphicContext->DrawPath( path );
 512     m_graphicContext->PopState();
 513 }
 514
 515 void wxGCDC::DoDrawPoint( wxCoord x, wxCoord y )
 516 {
 517     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 518
 519     DoDrawLine( x , y , x + 1 , y + 1 );
 520 }
 521
 522 void wxGCDC::DoDrawLines(int n, wxPoint points[],
 523                          wxCoord xoffset, wxCoord yoffset)
 524 {
 525     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 526
 527 #if !wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
 528
 529     if ( m_logicalFunction != wxCOPY )
 530         return;
 531 #endif
 532
 533     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 534     for( int i = 0; i < n; ++i)
 535     {
 536         pointsD[i].m_x = points[i].x + xoffset;
 537         pointsD[i].m_y = points[i].y + yoffset;
 538     }
 539
 540     m_graphicContext->StrokeLines( n , pointsD);
 541     delete[] pointsD;
 542 }
 543
 544 #if wxUSE_SPLINES
 545 void wxGCDC::DoDrawSpline(wxList *points)
 546 {
 547     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 548
 549     if ( m_logicalFunction != wxCOPY )
 550         return;
 551
 552     wxGraphicsPath path = m_graphicContext->CreatePath();
 553
 554     wxList::compatibility_iterator node = points->GetFirst();
 555     if (node == wxList::compatibility_iterator())
 556         // empty list
 557         return;
 558
 559     wxPoint *p = (wxPoint *)node->GetData();
 560
 561     wxCoord x1 = p->x;
 562     wxCoord y1 = p->y;
 563
 564     node = node->GetNext();
 565     p = (wxPoint *)node->GetData();
 566
 567     wxCoord x2 = p->x;
 568     wxCoord y2 = p->y;
 569     wxCoord cx1 = ( x1 + x2 ) / 2;
 570     wxCoord cy1 = ( y1 + y2 ) / 2;
 571
 572     path.MoveToPoint( x1 , y1 );
 573     path.AddLineToPoint( cx1 , cy1 );
 574 #if !wxUSE_STL
 575
 576     while ((node = node->GetNext()) != NULL)
 577 #else
 578
 579     while ((node = node->GetNext()))
 580 #endif // !wxUSE_STL
 581
 582     {
 583         p = (wxPoint *)node->GetData();
 584         x1 = x2;
 585         y1 = y2;
 586         x2 = p->x;
 587         y2 = p->y;
 588         wxCoord cx4 = (x1 + x2) / 2;
 589         wxCoord cy4 = (y1 + y2) / 2;
 590
 591         path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 592
 593         cx1 = cx4;
 594         cy1 = cy4;
 595     }
 596
 597     path.AddLineToPoint( x2 , y2 );
 598
 599     m_graphicContext->StrokePath( path );
 600 }
 601 #endif // wxUSE_SPLINES
 602
 603 void wxGCDC::DoDrawPolygon( int n, wxPoint points[],
 604                             wxCoord xoffset, wxCoord yoffset,
 605                             int fillStyle )
 606 {
 607     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 608
 609     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 610         return;
 611     if ( m_logicalFunction != wxCOPY )
 612         return;
 613
 614     bool closeIt = false;
 615     if (points[n-1] != points[0])
 616         closeIt = true;
 617
 618     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 619     for( int i = 0; i < n; ++i)
 620     {
 621         pointsD[i].m_x = points[i].x + xoffset;
 622         pointsD[i].m_y = points[i].y + yoffset;
 623     }
 624     if ( closeIt )
 625         pointsD[n] = pointsD[0];
 626
 627     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 628     delete[] pointsD;
 629 }
 630
 631 void wxGCDC::DoDrawPolyPolygon(int n,
 632                                int count[],
 633                                wxPoint points[],
 634                                wxCoord xoffset,
 635                                wxCoord yoffset,
 636                                int fillStyle)
 637 {
 638     wxASSERT(n > 1);
 639     wxGraphicsPath path = m_graphicContext->CreatePath();
 640
 641     int i = 0;
 642     for ( int j = 0; j < n; ++j)
 643     {
 644         wxPoint start = points[i];
 645         path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
 646         ++i;
 647         int l = count[j];
 648         for ( int k = 1; k < l; ++k)
 649         {
 650             path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
 651             ++i;
 652         }
 653         // close the polygon
 654         if ( start != points[i-1])
 655             path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
 656     }
 657     m_graphicContext->DrawPath( path , fillStyle);
 658 }
 659
 660 void wxGCDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 661 {
 662     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 663
 664     if ( m_logicalFunction != wxCOPY )
 665         return;
 666
 667     // CMB: draw nothing if transformed w or h is 0
 668     if (w == 0 || h == 0)
 669         return;
 670
 671     if ( m_graphicContext->ShouldOffset() )
 672     {
 673         // if we are offsetting the entire rectangle is moved 0.5, so the
 674         // border line gets off by 1
 675         w -= 1;
 676         h -= 1;
 677     }
 678     m_graphicContext->DrawRectangle(x,y,w,h);
 679 }
 680
 681 void wxGCDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 682                                     wxCoord w, wxCoord h,
 683                                     double radius)
 684 {
 685     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 686
 687     if ( m_logicalFunction != wxCOPY )
 688         return;
 689
 690     if (radius < 0.0)
 691         radius = - radius * ((w < h) ? w : h);
 692
 693     // CMB: draw nothing if transformed w or h is 0
 694     if (w == 0 || h == 0)
 695         return;
 696
 697     m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
 698 }
 699
 700 void wxGCDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 701 {
 702     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 703
 704     if ( m_logicalFunction != wxCOPY )
 705         return;
 706
 707     m_graphicContext->DrawEllipse(x,y,w,h);
 708 }
 709
 710 bool wxGCDC::CanDrawBitmap() const
 711 {
 712     return true;
 713 }
 714
 715 bool wxGCDC::DoBlit(
 716     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 717     wxDC *source, wxCoord xsrc, wxCoord ysrc, int logical_func , bool WXUNUSED(useMask),
 718     wxCoord xsrcMask, wxCoord ysrcMask )
 719 {
 720     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::DoBlit - invalid DC") );
 721     wxCHECK_MSG( source->Ok(), false, wxT("wxGCDC(cg)::DoBlit - invalid source DC") );
 722
 723     if ( logical_func == wxNO_OP )
 724         return true;
 725     else if ( logical_func != wxCOPY )
 726     {
 727         wxFAIL_MSG( wxT("Blitting is only supported with wxCOPY logical operation.") );
 728         return false;
 729     }
 730
 731     if (xsrcMask == -1 && ysrcMask == -1)
 732     {
 733         xsrcMask = xsrc;
 734         ysrcMask = ysrc;
 735     }
 736
 737     wxRect subrect(source-> LogicalToDeviceX(xsrc),source-> LogicalToDeviceY(ysrc),
 738         source-> LogicalToDeviceXRel(width),source-> LogicalToDeviceYRel(height));
 739
 740     wxBitmap blit = source->GetAsBitmap( &subrect );
 741
 742     if ( blit.Ok() )
 743     {
 744         m_graphicContext->DrawBitmap( blit, xdest , ydest , width , height );
 745     }
 746     else
 747     {
 748         wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
 749         return false;
 750     }
 751
 752     return true;
 753 }
 754
 755 void wxGCDC::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 756                                double angle)
 757 {
 758     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 759
 760     if ( str.length() == 0 )
 761         return;
 762     if ( m_logicalFunction != wxCOPY )
 763         return;
 764
 765      m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 766 }
 767
 768 void wxGCDC::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 769 {
 770     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 771
 772     if ( str.length() == 0 )
 773         return;
 774     if ( m_logicalFunction != wxCOPY )
 775         return;
 776
 777     m_graphicContext->DrawText( str, x ,y);
 778 }
 779
 780 bool wxGCDC::CanGetTextExtent() const
 781 {
 782     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 783
 784     return true;
 785 }
 786
 787 void wxGCDC::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
 788                               wxCoord *descent, wxCoord *externalLeading ,
 789                               wxFont *theFont ) const
 790 {
 791     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 792
 793     if ( theFont )
 794     {
 795         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
 796     }
 797
 798     wxDouble h , d , e , w;
 799
 800     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
 801
 802     if ( height )
 803         *height = (wxCoord)h;
 804     if ( descent )
 805         *descent = (wxCoord)d;
 806     if ( externalLeading )
 807         *externalLeading = (wxCoord)e;
 808     if ( width )
 809         *width = (wxCoord)w;
 810
 811     if ( theFont )
 812     {
 813         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 814     }
 815 }
 816
 817 bool wxGCDC::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 818 {
 819     wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
 820     widths.Clear();
 821     widths.Add(0,text.Length());
 822     if ( text.IsEmpty() )
 823         return true;
 824
 825     wxArrayDouble widthsD;
 826
 827     m_graphicContext->GetPartialTextExtents( text, widthsD );
 828     for ( size_t i = 0; i < widths.GetCount(); ++i )
 829         widths[i] = (wxCoord)(widthsD[i] + 0.5);
 830
 831     return true;
 832 }
 833
 834 wxCoord wxGCDC::GetCharWidth(void) const
 835 {
 836     wxCoord width;
 837     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
 838
 839     return width;
 840 }
 841
 842 wxCoord wxGCDC::GetCharHeight(void) const
 843 {
 844     wxCoord height;
 845     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
 846
 847     return height;
 848 }
 849
 850 void wxGCDC::Clear(void)
 851 {
 852     wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::Clear - invalid DC") );
 853     // TODO better implementation / incorporate size info into wxGCDC or context
 854     m_graphicContext->SetBrush( m_backgroundBrush );
 855     wxPen p = *wxTRANSPARENT_PEN;
 856     m_graphicContext->SetPen( p );
 857     DoDrawRectangle( 0, 0, 32000 , 32000 );
 858     m_graphicContext->SetPen( m_pen );
 859     m_graphicContext->SetBrush( m_brush );
 860 }
 861
 862 void wxGCDC::DoGetSize(int *width, int *height) const
 863 {
 864     *width = 1000;
 865     *height = 1000;
 866 }
 867
 868 void wxGCDC::DoGradientFillLinear(const wxRect& rect,
 869                                   const wxColour& initialColour,
 870                                   const wxColour& destColour,
 871                                   wxDirection nDirection )
 872 {
 873     wxPoint start;
 874     wxPoint end;
 875     switch( nDirection)
 876     {
 877     case wxWEST :
 878         start = rect.GetRightBottom();
 879         start.x++;
 880         end = rect.GetLeftBottom();
 881         break;
 882     case wxEAST :
 883         start = rect.GetLeftBottom();
 884         end = rect.GetRightBottom();
 885         end.x++;
 886         break;
 887     case wxNORTH :
 888         start = rect.GetLeftBottom();
 889         start.y++;
 890         end = rect.GetLeftTop();
 891         break;
 892     case wxSOUTH :
 893         start = rect.GetLeftTop();
 894         end = rect.GetLeftBottom();
 895         end.y++;
 896         break;
 897     default :
 898         break;
 899     }
 900
 901     if (rect.width == 0 || rect.height == 0)
 902         return;
 903
 904     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
 905         start.x,start.y,end.x,end.y, initialColour, destColour));
 906     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 907     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 908     m_graphicContext->SetPen(m_pen);
 909 }
 910
 911 void wxGCDC::DoGradientFillConcentric(const wxRect& rect,
 912                                       const wxColour& initialColour,
 913                                       const wxColour& destColour,
 914                                       const wxPoint& circleCenter)
 915 {
 916     //Radius
 917     wxInt32 cx = rect.GetWidth() / 2;
 918     wxInt32 cy = rect.GetHeight() / 2;
 919     wxInt32 nRadius;
 920     if (cx < cy)
 921         nRadius = cx;
 922     else
 923         nRadius = cy;
 924
 925     // make sure the background is filled (todo move into specific platform implementation ?)
 926     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 927     m_graphicContext->SetBrush( wxBrush( destColour) );
 928     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 929
 930     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
 931         rect.x+circleCenter.x,rect.y+circleCenter.y,
 932         rect.x+circleCenter.x,rect.y+circleCenter.y,
 933         nRadius,initialColour,destColour));
 934
 935     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
 936     m_graphicContext->SetPen(m_pen);
 937 }
 938
 939 void wxGCDC::DoDrawCheckMark(wxCoord x, wxCoord y,
 940                              wxCoord width, wxCoord height)
 941 {
 942     wxDCBase::DoDrawCheckMark(x,y,width,height);
 943 }
 944
 945 #endif // wxUSE_GRAPHICS_CONTEXT