src/common/dcgraph.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/dcgraph.cpp
   3 // Purpose:     graphics context methods common to all platforms
   4 // Author:      Stefan Csomor
   5 // Modified by:
   6 // Created:
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Stefan Csomor
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #if defined(__BORLANDC__)
  16     #pragma hdrstop
  17 #endif
  18
  19 #if wxUSE_GRAPHICS_CONTEXT
  20
  21 #include "wx/graphics.h"
  22 #include "wx/dcgraph.h"
  23
  24 #ifndef WX_PRECOMP
  25     #include "wx/icon.h"
  26     #include "wx/bitmap.h"
  27     #include "wx/dcmemory.h"
  28     #include "wx/region.h"
  29 #endif
  30
  31 #include "wx/dcclient.h"
  32
  33 #ifdef __WXOSX_OR_COCOA__
  34 #ifdef __WXOSX_IPHONE__
  35     #include <CoreGraphics/CoreGraphics.h>
  36 #else
  37     #include <ApplicationServices/ApplicationServices.h>
  38 #endif
  39 #endif
  40
  41 //-----------------------------------------------------------------------------
  42 // constants
  43 //-----------------------------------------------------------------------------
  44
  45 static const double RAD2DEG = 180.0 / M_PI;
  46
  47 //-----------------------------------------------------------------------------
  48 // Local functions
  49 //-----------------------------------------------------------------------------
  50
  51 static inline double DegToRad(double deg)
  52 {
  53     return (deg * M_PI) / 180.0;
  54 }
  55
  56 static wxCompositionMode TranslateRasterOp(wxRasterOperationMode function)
  57 {
  58     switch ( function )
  59     {
  60         case wxCOPY: // src
  61             // since we are supporting alpha, _OVER is closer to the intention than _SOURCE
  62             // since the latter would overwrite even when alpha is not set to opaque
  63             return wxCOMPOSITION_OVER;
  64
  65         case wxOR:         // src OR dst
  66             return wxCOMPOSITION_ADD;
  67
  68         case wxNO_OP:      // dst
  69             return wxCOMPOSITION_DEST; // ignore the source
  70
  71         case wxCLEAR:      // 0
  72             return wxCOMPOSITION_CLEAR;// clear dst
  73
  74         case wxXOR:        // src XOR dst
  75             return wxCOMPOSITION_XOR;
  76
  77         case wxAND:        // src AND dst
  78         case wxAND_INVERT: // (NOT src) AND dst
  79         case wxAND_REVERSE:// src AND (NOT dst)
  80         case wxEQUIV:      // (NOT src) XOR dst
  81         case wxINVERT:     // NOT dst
  82         case wxNAND:       // (NOT src) OR (NOT dst)
  83         case wxNOR:        // (NOT src) AND (NOT dst)
  84         case wxOR_INVERT:  // (NOT src) OR dst
  85         case wxOR_REVERSE: // src OR (NOT dst)
  86         case wxSET:        // 1
  87         case wxSRC_INVERT: // NOT src
  88             break;
  89     }
  90
  91     return wxCOMPOSITION_INVALID;
  92 }
  93
  94 //-----------------------------------------------------------------------------
  95 // wxDC bridge class
  96 //-----------------------------------------------------------------------------
  97
  98 IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDC)
  99
 100 wxGCDC::wxGCDC(const wxWindowDC& dc) :
 101   wxDC( new wxGCDCImpl( this, dc ) )
 102 {
 103 }
 104
 105 wxGCDC::wxGCDC( const wxMemoryDC& dc) :
 106   wxDC( new wxGCDCImpl( this, dc ) )
 107 {
 108 }
 109
 110 #if wxUSE_PRINTING_ARCHITECTURE
 111 wxGCDC::wxGCDC( const wxPrinterDC& dc) :
 112   wxDC( new wxGCDCImpl( this, dc ) )
 113 {
 114 }
 115 #endif
 116
 117 #if defined(__WXMSW__) && wxUSE_ENH_METAFILE
 118 wxGCDC::wxGCDC(const wxEnhMetaFileDC& dc)
 119    : wxDC(new wxGCDCImpl(this, dc))
 120 {
 121 }
 122 #endif
 123
 124 wxGCDC::wxGCDC(wxGraphicsContext* context) :
 125     wxDC( new wxGCDCImpl( this ) )
 126 {
 127     SetGraphicsContext(context);
 128 }
 129
 130 wxGCDC::wxGCDC() :
 131   wxDC( new wxGCDCImpl( this ) )
 132 {
 133 }
 134
 135 wxGCDC::~wxGCDC()
 136 {
 137 }
 138
 139 wxGraphicsContext* wxGCDC::GetGraphicsContext() const
 140 {
 141     if (!m_pimpl) return NULL;
 142     wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
 143     return gc_impl->GetGraphicsContext();
 144 }
 145
 146 void wxGCDC::SetGraphicsContext( wxGraphicsContext* ctx )
 147 {
 148     if (!m_pimpl) return;
 149     wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
 150     gc_impl->SetGraphicsContext( ctx );
 151 }
 152
 153 IMPLEMENT_ABSTRACT_CLASS(wxGCDCImpl, wxDCImpl)
 154
 155 wxGCDCImpl::wxGCDCImpl( wxDC *owner ) :
 156    wxDCImpl( owner )
 157 {
 158     Init(wxGraphicsContext::Create());
 159 }
 160
 161 void wxGCDCImpl::SetGraphicsContext( wxGraphicsContext* ctx )
 162 {
 163     delete m_graphicContext;
 164     m_graphicContext = ctx;
 165     if ( m_graphicContext )
 166     {
 167         m_matrixOriginal = m_graphicContext->GetTransform();
 168         m_ok = true;
 169         // apply the stored transformations to the passed in context
 170         ComputeScaleAndOrigin();
 171         m_graphicContext->SetFont( m_font , m_textForegroundColour );
 172         m_graphicContext->SetPen( m_pen );
 173         m_graphicContext->SetBrush( m_brush);
 174     }
 175 }
 176
 177 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxWindowDC& dc ) :
 178    wxDCImpl( owner )
 179 {
 180     Init(wxGraphicsContext::Create(dc));
 181     m_window = dc.GetWindow();
 182 }
 183
 184 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxMemoryDC& dc ) :
 185    wxDCImpl( owner )
 186 {
 187     Init(wxGraphicsContext::Create(dc));
 188 }
 189
 190 #if wxUSE_PRINTING_ARCHITECTURE
 191 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxPrinterDC& dc ) :
 192    wxDCImpl( owner )
 193 {
 194     Init(wxGraphicsContext::Create(dc));
 195 }
 196 #endif
 197
 198 #if defined(__WXMSW__) && wxUSE_ENH_METAFILE
 199 wxGCDCImpl::wxGCDCImpl(wxDC *owner, const wxEnhMetaFileDC& dc)
 200    : wxDCImpl(owner)
 201 {
 202     Init(wxGraphicsContext::Create(dc));
 203 }
 204 #endif
 205
 206 wxGCDCImpl::wxGCDCImpl(wxDC* owner, int)
 207    : wxDCImpl(owner)
 208 {
 209     // derived class will set a context
 210     Init(NULL);
 211 }
 212
 213 void wxGCDCImpl::Init(wxGraphicsContext* ctx)
 214 {
 215     m_ok = false;
 216     m_colour = true;
 217     m_mm_to_pix_x = mm2pt;
 218     m_mm_to_pix_y = mm2pt;
 219
 220     m_pen = *wxBLACK_PEN;
 221     m_font = *wxNORMAL_FONT;
 222     m_brush = *wxWHITE_BRUSH;
 223
 224     m_graphicContext = NULL;
 225     if (ctx)
 226         SetGraphicsContext(ctx);
 227
 228     m_logicalFunctionSupported = true;
 229 }
 230
 231 wxGCDCImpl::~wxGCDCImpl()
 232 {
 233     delete m_graphicContext;
 234 }
 235
 236 void wxGCDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y,
 237                                bool useMask )
 238 {
 239     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
 240     wxCHECK_RET( bmp.IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
 241
 242     int w = bmp.GetWidth();
 243     int h = bmp.GetHeight();
 244     if ( bmp.GetDepth() == 1 )
 245     {
 246         m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
 247         m_graphicContext->SetBrush( wxBrush( m_textBackgroundColour , wxSOLID ) );
 248         m_graphicContext->DrawRectangle( x, y, w, h );
 249         m_graphicContext->SetBrush( wxBrush( m_textForegroundColour , wxSOLID ) );
 250         m_graphicContext->DrawBitmap( bmp, x, y, w, h );
 251         m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
 252         m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
 253     }
 254     else // not a monochrome bitmap, handle it normally
 255     {
 256         // make a copy in case we need to remove its mask, if we don't modify
 257         // it the copy is cheap as bitmaps are reference-counted
 258         wxBitmap bmpCopy(bmp);
 259         if ( !useMask && bmp.GetMask() )
 260             bmpCopy.SetMask(NULL);
 261
 262         m_graphicContext->DrawBitmap( bmpCopy, x, y, w, h );
 263     }
 264 }
 265
 266 void wxGCDCImpl::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
 267 {
 268     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
 269     wxCHECK_RET( icon.IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
 270
 271     wxCoord w = icon.GetWidth();
 272     wxCoord h = icon.GetHeight();
 273
 274     m_graphicContext->DrawIcon( icon , x, y, w, h );
 275 }
 276
 277 bool wxGCDCImpl::StartDoc( const wxString& WXUNUSED(message) )
 278 {
 279     return true;
 280 }
 281
 282 void wxGCDCImpl::EndDoc()
 283 {
 284 }
 285
 286 void wxGCDCImpl::StartPage()
 287 {
 288 }
 289
 290 void wxGCDCImpl::EndPage()
 291 {
 292 }
 293
 294 void wxGCDCImpl::Flush()
 295 {
 296     m_graphicContext->Flush();
 297 }
 298
 299 void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
 300 {
 301     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
 302
 303     m_graphicContext->Clip( x, y, w, h );
 304     if ( m_clipping )
 305     {
 306         m_clipX1 = wxMax( m_clipX1, x );
 307         m_clipY1 = wxMax( m_clipY1, y );
 308         m_clipX2 = wxMin( m_clipX2, (x + w) );
 309         m_clipY2 = wxMin( m_clipY2, (y + h) );
 310     }
 311     else
 312     {
 313         m_clipping = true;
 314
 315         m_clipX1 = x;
 316         m_clipY1 = y;
 317         m_clipX2 = x + w;
 318         m_clipY2 = y + h;
 319     }
 320 }
 321
 322 void wxGCDCImpl::DoSetDeviceClippingRegion( const wxRegion &region )
 323 {
 324     // region is in device coordinates
 325     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetDeviceClippingRegion - invalid DC") );
 326
 327     if (region.Empty())
 328     {
 329         //DestroyClippingRegion();
 330         return;
 331     }
 332
 333     wxRegion logRegion( region );
 334     wxCoord x, y, w, h;
 335
 336     logRegion.Offset( DeviceToLogicalX(0), DeviceToLogicalY(0) );
 337     logRegion.GetBox( x, y, w, h );
 338
 339     m_graphicContext->Clip( logRegion );
 340     if ( m_clipping )
 341     {
 342         m_clipX1 = wxMax( m_clipX1, x );
 343         m_clipY1 = wxMax( m_clipY1, y );
 344         m_clipX2 = wxMin( m_clipX2, (x + w) );
 345         m_clipY2 = wxMin( m_clipY2, (y + h) );
 346     }
 347     else
 348     {
 349         m_clipping = true;
 350
 351         m_clipX1 = x;
 352         m_clipY1 = y;
 353         m_clipX2 = x + w;
 354         m_clipY2 = y + h;
 355     }
 356 }
 357
 358 void wxGCDCImpl::DestroyClippingRegion()
 359 {
 360     m_graphicContext->ResetClip();
 361     // currently the clip eg of a window extends to the area between the scrollbars
 362     // so we must explicitly make sure it only covers the area we want it to draw
 363     int width, height ;
 364     GetOwner()->GetSize( &width , &height ) ;
 365     m_graphicContext->Clip( DeviceToLogicalX(0) , DeviceToLogicalY(0) , DeviceToLogicalXRel(width), DeviceToLogicalYRel(height) );
 366
 367     m_graphicContext->SetPen( m_pen );
 368     m_graphicContext->SetBrush( m_brush );
 369
 370     m_clipping = false;
 371 }
 372
 373 void wxGCDCImpl::DoGetSizeMM( int* width, int* height ) const
 374 {
 375     int w = 0, h = 0;
 376
 377     GetOwner()->GetSize( &w, &h );
 378     if (width)
 379         *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
 380     if (height)
 381         *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
 382 }
 383
 384 void wxGCDCImpl::SetTextForeground( const wxColour &col )
 385 {
 386     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 387
 388     // don't set m_textForegroundColour to an invalid colour as we'd crash
 389     // later then (we use m_textForegroundColour.GetColor() without checking
 390     // in a few places)
 391     if ( col.IsOk() )
 392     {
 393         m_textForegroundColour = col;
 394         m_graphicContext->SetFont( m_font, m_textForegroundColour );
 395     }
 396 }
 397
 398 void wxGCDCImpl::SetTextBackground( const wxColour &col )
 399 {
 400     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 401
 402     m_textBackgroundColour = col;
 403 }
 404
 405 wxSize wxGCDCImpl::GetPPI() const
 406 {
 407     return wxSize(72, 72);
 408 }
 409
 410 int wxGCDCImpl::GetDepth() const
 411 {
 412     return 32;
 413 }
 414
 415 void wxGCDCImpl::ComputeScaleAndOrigin()
 416 {
 417     wxDCImpl::ComputeScaleAndOrigin();
 418
 419     if ( m_graphicContext )
 420     {
 421         m_matrixCurrent = m_graphicContext->CreateMatrix();
 422
 423         // the logical origin sets the origin to have new coordinates
 424         m_matrixCurrent.Translate( m_deviceOriginX - m_logicalOriginX * m_signX * m_scaleX,
 425                                    m_deviceOriginY-m_logicalOriginY * m_signY * m_scaleY);
 426
 427         m_matrixCurrent.Scale( m_scaleX * m_signX, m_scaleY * m_signY );
 428
 429         m_graphicContext->SetTransform( m_matrixOriginal );
 430         m_graphicContext->ConcatTransform( m_matrixCurrent );
 431     }
 432 }
 433
 434 void* wxGCDCImpl::GetHandle() const
 435 {
 436     void* cgctx = NULL;
 437     wxGraphicsContext* gc = GetGraphicsContext();
 438     if (gc) {
 439         cgctx = gc->GetNativeContext();
 440     }
 441     return cgctx;
 442 }
 443
 444 void wxGCDCImpl::SetPalette( const wxPalette& WXUNUSED(palette) )
 445 {
 446
 447 }
 448
 449 void wxGCDCImpl::SetBackgroundMode( int mode )
 450 {
 451     m_backgroundMode = mode;
 452 }
 453
 454 void wxGCDCImpl::SetFont( const wxFont &font )
 455 {
 456     m_font = font;
 457     if ( m_graphicContext )
 458     {
 459         m_graphicContext->SetFont(font, m_textForegroundColour);
 460     }
 461 }
 462
 463 void wxGCDCImpl::SetPen( const wxPen &pen )
 464 {
 465     m_pen = pen;
 466     if ( m_graphicContext )
 467     {
 468         m_graphicContext->SetPen( m_pen );
 469     }
 470 }
 471
 472 void wxGCDCImpl::SetBrush( const wxBrush &brush )
 473 {
 474     m_brush = brush;
 475     if ( m_graphicContext )
 476     {
 477         m_graphicContext->SetBrush( m_brush );
 478     }
 479 }
 480
 481 void wxGCDCImpl::SetBackground( const wxBrush &brush )
 482 {
 483     m_backgroundBrush = brush;
 484     if (!m_backgroundBrush.IsOk())
 485         return;
 486 }
 487
 488 void wxGCDCImpl::SetLogicalFunction( wxRasterOperationMode function )
 489 {
 490     m_logicalFunction = function;
 491
 492     wxCompositionMode mode = TranslateRasterOp( function );
 493     m_logicalFunctionSupported = mode != wxCOMPOSITION_INVALID;
 494     if (m_logicalFunctionSupported)
 495         m_logicalFunctionSupported = m_graphicContext->SetCompositionMode(mode);
 496
 497     if ( function == wxXOR )
 498         m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 499     else
 500         m_graphicContext->SetAntialiasMode(wxANTIALIAS_DEFAULT);
 501 }
 502
 503 bool wxGCDCImpl::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 504                              const wxColour& WXUNUSED(col),
 505                              wxFloodFillStyle WXUNUSED(style))
 506 {
 507     return false;
 508 }
 509
 510 bool wxGCDCImpl::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 511 {
 512     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
 513     return false;
 514 }
 515
 516 void wxGCDCImpl::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 517 {
 518     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 519
 520     if ( !m_logicalFunctionSupported )
 521         return;
 522
 523     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 524
 525     CalcBoundingBox(x1, y1);
 526     CalcBoundingBox(x2, y2);
 527 }
 528
 529 void wxGCDCImpl::DoCrossHair( wxCoord x, wxCoord y )
 530 {
 531     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 532
 533     if ( !m_logicalFunctionSupported )
 534         return;
 535
 536     int w = 0, h = 0;
 537
 538     GetOwner()->GetSize( &w, &h );
 539
 540     m_graphicContext->StrokeLine(0,y,w,y);
 541     m_graphicContext->StrokeLine(x,0,x,h);
 542
 543     CalcBoundingBox(0, 0);
 544     CalcBoundingBox(0+w, 0+h);
 545 }
 546
 547 void wxGCDCImpl::DoDrawArc( wxCoord x1, wxCoord y1,
 548                         wxCoord x2, wxCoord y2,
 549                         wxCoord xc, wxCoord yc )
 550 {
 551     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 552
 553     if ( !m_logicalFunctionSupported )
 554         return;
 555
 556     double dx = x1 - xc;
 557     double dy = y1 - yc;
 558     double radius = sqrt((double)(dx * dx + dy * dy));
 559     wxCoord rad = (wxCoord)radius;
 560     double sa, ea;
 561     if (x1 == x2 && y1 == y2)
 562     {
 563         sa = 0.0;
 564         ea = 360.0;
 565     }
 566     else if (radius == 0.0)
 567     {
 568         sa = ea = 0.0;
 569     }
 570     else
 571     {
 572         sa = (x1 - xc == 0) ?
 573      (y1 - yc < 0) ? 90.0 : -90.0 :
 574              -atan2(double(y1 - yc), double(x1 - xc)) * RAD2DEG;
 575         ea = (x2 - xc == 0) ?
 576      (y2 - yc < 0) ? 90.0 : -90.0 :
 577              -atan2(double(y2 - yc), double(x2 - xc)) * RAD2DEG;
 578     }
 579
 580     bool fill = m_brush.GetStyle() != wxTRANSPARENT;
 581
 582     wxGraphicsPath path = m_graphicContext->CreatePath();
 583     if ( fill && ((x1!=x2)||(y1!=y2)) )
 584         path.MoveToPoint( xc, yc );
 585     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 586     // get clockwise angles
 587     path.AddArc( xc, yc , rad , DegToRad(-sa) , DegToRad(-ea), false );
 588     if ( fill && ((x1!=x2)||(y1!=y2)) )
 589         path.AddLineToPoint( xc, yc );
 590     m_graphicContext->DrawPath(path);
 591 }
 592
 593 void wxGCDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 594                                 double sa, double ea )
 595 {
 596     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 597
 598     if ( !m_logicalFunctionSupported )
 599         return;
 600
 601     m_graphicContext->PushState();
 602     m_graphicContext->Translate(x+w/2.0,y+h/2.0);
 603     wxDouble factor = ((wxDouble) w) / h;
 604     m_graphicContext->Scale( factor , 1.0);
 605
 606     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
 607     // get clockwise angles
 608     if ( m_brush.GetStyle() != wxTRANSPARENT )
 609     {
 610         wxGraphicsPath path = m_graphicContext->CreatePath();
 611         path.MoveToPoint( 0, 0 );
 612         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 613         path.AddLineToPoint( 0, 0 );
 614         m_graphicContext->FillPath( path );
 615
 616         path = m_graphicContext->CreatePath();
 617         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 618         m_graphicContext->StrokePath( path );
 619     }
 620     else
 621     {
 622         wxGraphicsPath path = m_graphicContext->CreatePath();
 623         path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
 624         m_graphicContext->DrawPath( path );
 625     }
 626
 627     m_graphicContext->PopState();
 628 }
 629
 630 void wxGCDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
 631 {
 632     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 633
 634     DoDrawLine( x , y , x + 1 , y + 1 );
 635 }
 636
 637 void wxGCDCImpl::DoDrawLines(int n, wxPoint points[],
 638                          wxCoord xoffset, wxCoord yoffset)
 639 {
 640     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 641
 642     if ( !m_logicalFunctionSupported )
 643         return;
 644
 645     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
 646     for( int i = 0; i < n; ++i)
 647     {
 648         pointsD[i].m_x = points[i].x + xoffset;
 649         pointsD[i].m_y = points[i].y + yoffset;
 650     }
 651
 652     m_graphicContext->StrokeLines( n , pointsD);
 653     delete[] pointsD;
 654 }
 655
 656 #if wxUSE_SPLINES
 657 void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
 658 {
 659     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 660
 661     if ( !m_logicalFunctionSupported )
 662         return;
 663
 664     wxGraphicsPath path = m_graphicContext->CreatePath();
 665
 666     wxPointList::compatibility_iterator node = points->GetFirst();
 667     if ( !node )
 668         // empty list
 669         return;
 670
 671     wxPoint *p = node->GetData();
 672
 673     wxCoord x1 = p->x;
 674     wxCoord y1 = p->y;
 675
 676     node = node->GetNext();
 677     p = node->GetData();
 678
 679     wxCoord x2 = p->x;
 680     wxCoord y2 = p->y;
 681     wxCoord cx1 = ( x1 + x2 ) / 2;
 682     wxCoord cy1 = ( y1 + y2 ) / 2;
 683
 684     path.MoveToPoint( x1 , y1 );
 685     path.AddLineToPoint( cx1 , cy1 );
 686 #if !wxUSE_STD_CONTAINERS
 687
 688     while ((node = node->GetNext()) != NULL)
 689 #else
 690
 691     while ((node = node->GetNext()))
 692 #endif // !wxUSE_STD_CONTAINERS
 693
 694     {
 695         p = node->GetData();
 696         x1 = x2;
 697         y1 = y2;
 698         x2 = p->x;
 699         y2 = p->y;
 700         wxCoord cx4 = (x1 + x2) / 2;
 701         wxCoord cy4 = (y1 + y2) / 2;
 702
 703         path.AddQuadCurveToPoint(x1 , y1 ,cx4 , cy4 );
 704
 705         cx1 = cx4;
 706         cy1 = cy4;
 707     }
 708
 709     path.AddLineToPoint( x2 , y2 );
 710
 711     m_graphicContext->StrokePath( path );
 712 }
 713 #endif // wxUSE_SPLINES
 714
 715 void wxGCDCImpl::DoDrawPolygon( int n, wxPoint points[],
 716                                 wxCoord xoffset, wxCoord yoffset,
 717                                 wxPolygonFillMode fillStyle )
 718 {
 719     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 720
 721     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
 722         return;
 723     if ( !m_logicalFunctionSupported )
 724         return;
 725
 726     bool closeIt = false;
 727     if (points[n-1] != points[0])
 728         closeIt = true;
 729
 730     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n+(closeIt?1:0)];
 731     for( int i = 0; i < n; ++i)
 732     {
 733         pointsD[i].m_x = points[i].x + xoffset;
 734         pointsD[i].m_y = points[i].y + yoffset;
 735     }
 736     if ( closeIt )
 737         pointsD[n] = pointsD[0];
 738
 739     m_graphicContext->DrawLines( n+(closeIt?1:0) , pointsD, fillStyle);
 740     delete[] pointsD;
 741 }
 742
 743 void wxGCDCImpl::DoDrawPolyPolygon(int n,
 744                                int count[],
 745                                wxPoint points[],
 746                                wxCoord xoffset,
 747                                wxCoord yoffset,
 748                                wxPolygonFillMode fillStyle)
 749 {
 750     wxASSERT(n > 1);
 751     wxGraphicsPath path = m_graphicContext->CreatePath();
 752
 753     int i = 0;
 754     for ( int j = 0; j < n; ++j)
 755     {
 756         wxPoint start = points[i];
 757         path.MoveToPoint( start.x+ xoffset, start.y+ yoffset);
 758         ++i;
 759         int l = count[j];
 760         for ( int k = 1; k < l; ++k)
 761         {
 762             path.AddLineToPoint( points[i].x+ xoffset, points[i].y+ yoffset);
 763             ++i;
 764         }
 765         // close the polygon
 766         if ( start != points[i-1])
 767             path.AddLineToPoint( start.x+ xoffset, start.y+ yoffset);
 768     }
 769     m_graphicContext->DrawPath( path , fillStyle);
 770 }
 771
 772 void wxGCDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 773 {
 774     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 775
 776     if ( !m_logicalFunctionSupported )
 777         return;
 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->DrawRectangle(x,y,w,h);
 791 }
 792
 793 void wxGCDCImpl::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 794                                     wxCoord w, wxCoord h,
 795                                     double radius)
 796 {
 797     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 798
 799     if ( !m_logicalFunctionSupported )
 800         return;
 801
 802     if (radius < 0.0)
 803         radius = - radius * ((w < h) ? w : h);
 804
 805     // CMB: draw nothing if transformed w or h is 0
 806     if (w == 0 || h == 0)
 807         return;
 808
 809     if ( m_graphicContext->ShouldOffset() )
 810     {
 811         // if we are offsetting the entire rectangle is moved 0.5, so the
 812         // border line gets off by 1
 813         w -= 1;
 814         h -= 1;
 815     }
 816     m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
 817 }
 818
 819 void wxGCDCImpl::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 820 {
 821     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 822
 823     if ( !m_logicalFunctionSupported )
 824         return;
 825
 826     if ( m_graphicContext->ShouldOffset() )
 827     {
 828         // if we are offsetting the entire rectangle is moved 0.5, so the
 829         // border line gets off by 1
 830         w -= 1;
 831         h -= 1;
 832     }
 833     m_graphicContext->DrawEllipse(x,y,w,h);
 834 }
 835
 836 bool wxGCDCImpl::CanDrawBitmap() const
 837 {
 838     return true;
 839 }
 840
 841 bool wxGCDCImpl::DoBlit(
 842     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 843     wxDC *source, wxCoord xsrc, wxCoord ysrc,
 844     wxRasterOperationMode logical_func , bool useMask,
 845     wxCoord xsrcMask, wxCoord ysrcMask )
 846 {
 847     return DoStretchBlit( xdest, ydest, width, height,
 848         source, xsrc, ysrc, width, height, logical_func, useMask,
 849         xsrcMask,ysrcMask );
 850 }
 851
 852 bool wxGCDCImpl::DoStretchBlit(
 853     wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
 854     wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
 855     wxRasterOperationMode logical_func , bool useMask,
 856     wxCoord xsrcMask, wxCoord ysrcMask )
 857 {
 858     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
 859     wxCHECK_MSG( source->IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid source DC") );
 860
 861     if ( logical_func == wxNO_OP )
 862         return true;
 863
 864     wxCompositionMode mode = TranslateRasterOp(logical_func);
 865     if ( mode == wxCOMPOSITION_INVALID )
 866     {
 867         wxFAIL_MSG( wxT("Blitting is not supported with this logical operation.") );
 868         return false;
 869     }
 870
 871     wxRect subrect(source->LogicalToDeviceX(xsrc),
 872                    source->LogicalToDeviceY(ysrc),
 873                    source->LogicalToDeviceXRel(srcWidth),
 874                    source->LogicalToDeviceYRel(srcHeight));
 875     const wxRect subrectOrig = subrect;
 876     // clip the subrect down to the size of the source DC
 877     wxRect clip;
 878     source->GetSize(&clip.width, &clip.height);
 879     subrect.Intersect(clip);
 880     if (subrect.width == 0)
 881         return true;
 882
 883     bool retval = true;
 884
 885     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
 886     if (m_graphicContext->SetCompositionMode(mode))
 887     {
 888         wxAntialiasMode formerAa = m_graphicContext->GetAntialiasMode();
 889         if (mode == wxCOMPOSITION_XOR)
 890         {
 891             m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
 892         }
 893
 894         if (xsrcMask == -1 && ysrcMask == -1)
 895         {
 896             xsrcMask = xsrc;
 897             ysrcMask = ysrc;
 898         }
 899
 900         wxBitmap blit = source->GetAsBitmap( &subrect );
 901
 902         if ( blit.IsOk() )
 903         {
 904             if ( !useMask && blit.GetMask() )
 905                 blit.SetMask(NULL);
 906
 907             double x = xdest;
 908             double y = ydest;
 909             double w = dstWidth;
 910             double h = dstHeight;
 911             // adjust dest rect if source rect is clipped
 912             if (subrect.width != subrectOrig.width || subrect.height != subrectOrig.height)
 913             {
 914                 x += (subrect.x - subrectOrig.x) / double(subrectOrig.width) * dstWidth;
 915                 y += (subrect.y - subrectOrig.y) / double(subrectOrig.height) * dstHeight;
 916                 w *= double(subrect.width) / subrectOrig.width;
 917                 h *= double(subrect.height) / subrectOrig.height;
 918             }
 919             m_graphicContext->DrawBitmap(blit, x, y, w, h);
 920         }
 921         else
 922         {
 923             wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
 924             retval = false;
 925         }
 926
 927         if (mode == wxCOMPOSITION_XOR)
 928         {
 929             m_graphicContext->SetAntialiasMode(formerAa);
 930         }
 931     }
 932     // reset composition
 933     m_graphicContext->SetCompositionMode(formerMode);
 934
 935     return retval;
 936 }
 937
 938 void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 939                                double angle)
 940 {
 941     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 942
 943     if ( str.empty() )
 944         return;
 945     if ( !m_logicalFunctionSupported )
 946         return;
 947
 948     if ( m_backgroundMode == wxTRANSPARENT )
 949         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
 950     else
 951         m_graphicContext->DrawText( str, x ,y , DegToRad(angle ), m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 952 }
 953
 954 void wxGCDCImpl::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 955 {
 956     // For compatibility with other ports (notably wxGTK) and because it's
 957     // genuinely useful, we allow passing multiline strings to DrawText().
 958     // However there is no native OSX function to draw them directly so we
 959     // instead reuse the generic DrawLabel() method to render them. Of course,
 960     // DrawLabel() itself will call back to us but with single line strings
 961     // only so there won't be any infinite recursion here.
 962     if ( str.find('\n') != wxString::npos )
 963     {
 964         GetOwner()->DrawLabel(str, wxRect(x, y, 0, 0));
 965         return;
 966     }
 967
 968     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawText - invalid DC") );
 969
 970     if ( str.empty() )
 971         return;
 972
 973     if ( !m_logicalFunctionSupported )
 974         return;
 975
 976     if ( m_backgroundMode == wxTRANSPARENT )
 977         m_graphicContext->DrawText( str, x ,y);
 978     else
 979         m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 980 }
 981
 982 bool wxGCDCImpl::CanGetTextExtent() const
 983 {
 984     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 985
 986     return true;
 987 }
 988
 989 void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
 990                               wxCoord *descent, wxCoord *externalLeading ,
 991                               const wxFont *theFont ) const
 992 {
 993     wxCHECK_RET( m_graphicContext, wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 994
 995     if ( theFont )
 996     {
 997         m_graphicContext->SetFont( *theFont, m_textForegroundColour );
 998     }
 999
1000     wxDouble h , d , e , w;
1001
1002     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
1003
1004     if ( height )
1005         *height = (wxCoord)(h+0.5);
1006     if ( descent )
1007         *descent = (wxCoord)(d+0.5);
1008     if ( externalLeading )
1009         *externalLeading = (wxCoord)(e+0.5);
1010     if ( width )
1011         *width = (wxCoord)(w+0.5);
1012
1013     if ( theFont )
1014     {
1015         m_graphicContext->SetFont( m_font, m_textForegroundColour );
1016     }
1017 }
1018
1019 bool wxGCDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
1020 {
1021     wxCHECK_MSG( m_graphicContext, false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
1022     widths.Clear();
1023     widths.Add(0,text.Length());
1024     if ( text.IsEmpty() )
1025         return true;
1026
1027     wxArrayDouble widthsD;
1028
1029     m_graphicContext->GetPartialTextExtents( text, widthsD );
1030     for ( size_t i = 0; i < widths.GetCount(); ++i )
1031         widths[i] = (wxCoord)(widthsD[i] + 0.5);
1032
1033     return true;
1034 }
1035
1036 wxCoord wxGCDCImpl::GetCharWidth(void) const
1037 {
1038     wxCoord width;
1039     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
1040
1041     return width;
1042 }
1043
1044 wxCoord wxGCDCImpl::GetCharHeight(void) const
1045 {
1046     wxCoord height;
1047     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
1048
1049     return height;
1050 }
1051
1052 void wxGCDCImpl::Clear(void)
1053 {
1054     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::Clear - invalid DC") );
1055     // TODO better implementation / incorporate size info into wxGCDC or context
1056     m_graphicContext->SetBrush( m_backgroundBrush );
1057     wxPen p = *wxTRANSPARENT_PEN;
1058     m_graphicContext->SetPen( p );
1059     wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
1060     m_graphicContext->SetCompositionMode(wxCOMPOSITION_SOURCE);
1061     // maximum positive coordinate Cairo can handle is 2^23 - 1
1062     DoDrawRectangle(
1063         DeviceToLogicalX(0), DeviceToLogicalY(0),
1064         DeviceToLogicalXRel(0x007fffff), DeviceToLogicalYRel(0x007fffff));
1065     m_graphicContext->SetCompositionMode(formerMode);
1066     m_graphicContext->SetPen( m_pen );
1067     m_graphicContext->SetBrush( m_brush );
1068 }
1069
1070 void wxGCDCImpl::DoGetSize(int *width, int *height) const
1071 {
1072     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetSize - invalid DC") );
1073     wxDouble w,h;
1074     m_graphicContext->GetSize( &w, &h );
1075     if ( height )
1076         *height = (int) (h+0.5);
1077     if ( width )
1078         *width = (int) (w+0.5);
1079 }
1080
1081 void wxGCDCImpl::DoGradientFillLinear(const wxRect& rect,
1082                                   const wxColour& initialColour,
1083                                   const wxColour& destColour,
1084                                   wxDirection nDirection )
1085 {
1086     wxPoint start;
1087     wxPoint end;
1088     switch( nDirection)
1089     {
1090     case wxWEST :
1091         start = rect.GetRightBottom();
1092         start.x++;
1093         end = rect.GetLeftBottom();
1094         break;
1095     case wxEAST :
1096         start = rect.GetLeftBottom();
1097         end = rect.GetRightBottom();
1098         end.x++;
1099         break;
1100     case wxNORTH :
1101         start = rect.GetLeftBottom();
1102         start.y++;
1103         end = rect.GetLeftTop();
1104         break;
1105     case wxSOUTH :
1106         start = rect.GetLeftTop();
1107         end = rect.GetLeftBottom();
1108         end.y++;
1109         break;
1110     default :
1111         break;
1112     }
1113
1114     if (rect.width == 0 || rect.height == 0)
1115         return;
1116
1117     m_graphicContext->SetBrush( m_graphicContext->CreateLinearGradientBrush(
1118         start.x,start.y,end.x,end.y, initialColour, destColour));
1119     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1120     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1121     m_graphicContext->SetPen(m_pen);
1122     m_graphicContext->SetBrush(m_brush);
1123 }
1124
1125 void wxGCDCImpl::DoGradientFillConcentric(const wxRect& rect,
1126                                       const wxColour& initialColour,
1127                                       const wxColour& destColour,
1128                                       const wxPoint& circleCenter)
1129 {
1130     //Radius
1131     wxInt32 cx = rect.GetWidth() / 2;
1132     wxInt32 cy = rect.GetHeight() / 2;
1133     wxInt32 nRadius;
1134     if (cx < cy)
1135         nRadius = cx;
1136     else
1137         nRadius = cy;
1138
1139     // make sure the background is filled (todo move into specific platform implementation ?)
1140     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
1141     m_graphicContext->SetBrush( wxBrush( destColour) );
1142     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1143
1144     m_graphicContext->SetBrush( m_graphicContext->CreateRadialGradientBrush(
1145         rect.x+circleCenter.x,rect.y+circleCenter.y,
1146         rect.x+circleCenter.x,rect.y+circleCenter.y,
1147         nRadius,initialColour,destColour));
1148
1149     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
1150     m_graphicContext->SetPen(m_pen);
1151     m_graphicContext->SetBrush(m_brush);
1152 }
1153
1154 void wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
1155                              wxCoord width, wxCoord height)
1156 {
1157     wxDCImpl::DoDrawCheckMark(x,y,width,height);
1158 }
1159
1160 #ifdef __WXMSW__
1161 wxRect wxGCDCImpl::MSWApplyGDIPlusTransform(const wxRect& r) const
1162 {
1163     wxGraphicsContext* const gc = GetGraphicsContext();
1164     wxCHECK_MSG( gc, r, wxT("Invalid wxGCDC") );
1165
1166     double x = 0,
1167            y = 0;
1168     gc->GetTransform().TransformPoint(&x, &y);
1169
1170     wxRect rect(r);
1171     rect.Offset(x, y);
1172
1173     return rect;
1174 }
1175 #endif // __WXMSW__
1176
1177 #endif // wxUSE_GRAPHICS_CONTEXT