src/common/graphcmn.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     #include "wx/log.h"
  29 #endif
  30
  31 #if !defined(wxMAC_USE_CORE_GRAPHICS_BLEND_MODES)
  32 #define wxMAC_USE_CORE_GRAPHICS_BLEND_MODES 0
  33 #endif
  34
  35 //-----------------------------------------------------------------------------
  36 // constants
  37 //-----------------------------------------------------------------------------
  38
  39 static const double RAD2DEG = 180.0 / M_PI;
  40
  41 //-----------------------------------------------------------------------------
  42 // Local functions
  43 //-----------------------------------------------------------------------------
  44
  45 static inline double DegToRad(double deg)
  46 {
  47     return (deg * M_PI) / 180.0;
  48 }
  49
  50 //-----------------------------------------------------------------------------
  51
  52 //-----------------------------------------------------------------------------
  53 // wxGraphicsObject
  54 //-----------------------------------------------------------------------------
  55
  56 IMPLEMENT_DYNAMIC_CLASS(wxGraphicsObject, wxObject)
  57
  58 wxGraphicsObjectRefData::wxGraphicsObjectRefData( wxGraphicsRenderer* renderer )
  59 {
  60     m_renderer = renderer;
  61 }
  62 wxGraphicsObjectRefData::wxGraphicsObjectRefData( const wxGraphicsObjectRefData* data )
  63 {
  64     m_renderer = data->m_renderer;
  65 }
  66 wxGraphicsRenderer* wxGraphicsObjectRefData::GetRenderer() const
  67 {
  68     return m_renderer ;
  69 }
  70
  71 wxGraphicsObjectRefData* wxGraphicsObjectRefData::Clone() const
  72 {
  73     return new wxGraphicsObjectRefData(this);
  74 }
  75
  76 wxGraphicsObject::wxGraphicsObject()
  77 {
  78 }
  79
  80 wxGraphicsObject::wxGraphicsObject( wxGraphicsRenderer* renderer )
  81 {
  82     SetRefData( new wxGraphicsObjectRefData(renderer));
  83 }
  84
  85 wxGraphicsObject::~wxGraphicsObject()
  86 {
  87 }
  88
  89 bool wxGraphicsObject::IsNull() const
  90 {
  91     return m_refData == NULL;
  92 }
  93
  94 wxGraphicsRenderer* wxGraphicsObject::GetRenderer() const
  95 {
  96     return ( IsNull() ? NULL : GetGraphicsData()->GetRenderer() );
  97 }
  98
  99 wxGraphicsObjectRefData* wxGraphicsObject::GetGraphicsData() const
 100 {
 101     return (wxGraphicsObjectRefData*) m_refData;
 102 }
 103
 104 wxObjectRefData* wxGraphicsObject::CreateRefData() const
 105 {
 106     wxLogDebug(wxT("A Null Object cannot be changed"));
 107     return NULL;
 108 }
 109
 110 wxObjectRefData* wxGraphicsObject::CloneRefData(const wxObjectRefData* data) const
 111 {
 112     const wxGraphicsObjectRefData* ptr = (const wxGraphicsObjectRefData*) data;
 113     return ptr->Clone();
 114 }
 115
 116 //-----------------------------------------------------------------------------
 117 // pens etc.
 118 //-----------------------------------------------------------------------------
 119
 120 IMPLEMENT_DYNAMIC_CLASS(wxGraphicsPen, wxGraphicsObject)
 121 IMPLEMENT_DYNAMIC_CLASS(wxGraphicsBrush, wxGraphicsObject)
 122 IMPLEMENT_DYNAMIC_CLASS(wxGraphicsFont, wxGraphicsObject)
 123
 124 WXDLLIMPEXP_DATA_CORE(wxGraphicsPen) wxNullGraphicsPen;
 125 WXDLLIMPEXP_DATA_CORE(wxGraphicsBrush) wxNullGraphicsBrush;
 126 WXDLLIMPEXP_DATA_CORE(wxGraphicsFont) wxNullGraphicsFont;
 127
 128 //-----------------------------------------------------------------------------
 129 // matrix
 130 //-----------------------------------------------------------------------------
 131
 132 IMPLEMENT_DYNAMIC_CLASS(wxGraphicsMatrix, wxGraphicsObject)
 133 WXDLLIMPEXP_DATA_CORE(wxGraphicsMatrix) wxNullGraphicsMatrix;
 134
 135 // concatenates the matrix
 136 void wxGraphicsMatrix::Concat( const wxGraphicsMatrix *t )
 137 {
 138     AllocExclusive();
 139     GetMatrixData()->Concat(t->GetMatrixData());
 140 }
 141
 142 // sets the matrix to the respective values
 143 void wxGraphicsMatrix::Set(wxDouble a, wxDouble b, wxDouble c, wxDouble d,
 144                            wxDouble tx, wxDouble ty)
 145 {
 146     AllocExclusive();
 147     GetMatrixData()->Set(a,b,c,d,tx,ty);
 148 }
 149
 150 // makes this the inverse matrix
 151 void wxGraphicsMatrix::Invert()
 152 {
 153     AllocExclusive();
 154     GetMatrixData()->Invert();
 155 }
 156
 157 // returns true if the elements of the transformation matrix are equal ?
 158 bool wxGraphicsMatrix::IsEqual( const wxGraphicsMatrix* t) const
 159 {
 160     return GetMatrixData()->IsEqual(t->GetMatrixData());
 161 }
 162
 163 // return true if this is the identity matrix
 164 bool wxGraphicsMatrix::IsIdentity() const
 165 {
 166     return GetMatrixData()->IsIdentity();
 167 }
 168
 169 // add the translation to this matrix
 170 void wxGraphicsMatrix::Translate( wxDouble dx , wxDouble dy )
 171 {
 172     AllocExclusive();
 173     GetMatrixData()->Translate(dx,dy);
 174 }
 175
 176 // add the scale to this matrix
 177 void wxGraphicsMatrix::Scale( wxDouble xScale , wxDouble yScale )
 178 {
 179     AllocExclusive();
 180     GetMatrixData()->Scale(xScale,yScale);
 181 }
 182
 183 // add the rotation to this matrix (radians)
 184 void wxGraphicsMatrix::Rotate( wxDouble angle )
 185 {
 186     AllocExclusive();
 187     GetMatrixData()->Rotate(angle);
 188 }
 189
 190 //
 191 // apply the transforms
 192 //
 193
 194 // applies that matrix to the point
 195 void wxGraphicsMatrix::TransformPoint( wxDouble *x, wxDouble *y ) const
 196 {
 197     GetMatrixData()->TransformPoint(x,y);
 198 }
 199
 200 // applies the matrix except for translations
 201 void wxGraphicsMatrix::TransformDistance( wxDouble *dx, wxDouble *dy ) const
 202 {
 203     GetMatrixData()->TransformDistance(dx,dy);
 204 }
 205
 206 // returns the native representation
 207 void * wxGraphicsMatrix::GetNativeMatrix() const
 208 {
 209     return GetMatrixData()->GetNativeMatrix();
 210 }
 211
 212 //-----------------------------------------------------------------------------
 213 // path
 214 //-----------------------------------------------------------------------------
 215
 216 IMPLEMENT_DYNAMIC_CLASS(wxGraphicsPath, wxGraphicsObject)
 217 WXDLLIMPEXP_DATA_CORE(wxGraphicsPath) wxNullGraphicsPath;
 218
 219 // convenience functions, for using wxPoint2DDouble etc
 220
 221 wxPoint2DDouble wxGraphicsPath::GetCurrentPoint() const
 222 {
 223     wxDouble x,y;
 224     GetCurrentPoint(&x,&y);
 225     return wxPoint2DDouble(x,y);
 226 }
 227
 228 void wxGraphicsPath::MoveToPoint( const wxPoint2DDouble& p)
 229 {
 230     MoveToPoint( p.m_x , p.m_y);
 231 }
 232
 233 void wxGraphicsPath::AddLineToPoint( const wxPoint2DDouble& p)
 234 {
 235     AddLineToPoint( p.m_x , p.m_y);
 236 }
 237
 238 void wxGraphicsPath::AddCurveToPoint( const wxPoint2DDouble& c1, const wxPoint2DDouble& c2, const wxPoint2DDouble& e)
 239 {
 240     AddCurveToPoint(c1.m_x, c1.m_y, c2.m_x, c2.m_y, e.m_x, e.m_y);
 241 }
 242
 243 void wxGraphicsPath::AddArc( const wxPoint2DDouble& c, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise)
 244 {
 245     AddArc(c.m_x, c.m_y, r, startAngle, endAngle, clockwise);
 246 }
 247
 248 wxRect2DDouble wxGraphicsPath::GetBox() const
 249 {
 250         wxDouble x,y,w,h;
 251         GetBox(&x,&y,&w,&h);
 252         return wxRect2DDouble( x,y,w,h );
 253 }
 254
 255 bool wxGraphicsPath::Contains( const wxPoint2DDouble& c, int fillStyle ) const
 256 {
 257     return Contains( c.m_x, c.m_y, fillStyle);
 258 }
 259
 260 // true redirections
 261
 262 // begins a new subpath at (x,y)
 263 void wxGraphicsPath::MoveToPoint( wxDouble x, wxDouble y )
 264 {
 265     AllocExclusive();
 266     GetPathData()->MoveToPoint(x,y);
 267 }
 268
 269 // adds a straight line from the current point to (x,y)
 270 void wxGraphicsPath::AddLineToPoint( wxDouble x, wxDouble y )
 271 {
 272     AllocExclusive();
 273     GetPathData()->AddLineToPoint(x,y);
 274 }
 275
 276 // adds a cubic Bezier curve from the current point, using two control points and an end point
 277 void wxGraphicsPath::AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y )
 278 {
 279     AllocExclusive();
 280     GetPathData()->AddCurveToPoint(cx1,cy1,cx2,cy2,x,y);
 281 }
 282
 283 // adds another path
 284 void wxGraphicsPath::AddPath( const wxGraphicsPath& path )
 285 {
 286     AllocExclusive();
 287     GetPathData()->AddPath(path.GetPathData());
 288 }
 289
 290 // closes the current sub-path
 291 void wxGraphicsPath::CloseSubpath()
 292 {
 293     AllocExclusive();
 294     GetPathData()->CloseSubpath();
 295 }
 296
 297 // gets the last point of the current path, (0,0) if not yet set
 298 void wxGraphicsPath::GetCurrentPoint( wxDouble* x, wxDouble* y) const
 299 {
 300     GetPathData()->GetCurrentPoint(x,y);
 301 }
 302
 303 // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
 304 void wxGraphicsPath::AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise )
 305 {
 306     AllocExclusive();
 307     GetPathData()->AddArc(x,y,r,startAngle,endAngle,clockwise);
 308 }
 309
 310 //
 311 // These are convenience functions which - if not available natively will be assembled
 312 // using the primitives from above
 313 //
 314
 315 // adds a quadratic Bezier curve from the current point, using a control point and an end point
 316 void wxGraphicsPath::AddQuadCurveToPoint( wxDouble cx, wxDouble cy, wxDouble x, wxDouble y )
 317 {
 318     AllocExclusive();
 319     GetPathData()->AddQuadCurveToPoint(cx,cy,x,y);
 320 }
 321
 322 // appends a rectangle as a new closed subpath
 323 void wxGraphicsPath::AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h )
 324 {
 325     AllocExclusive();
 326     GetPathData()->AddRectangle(x,y,w,h);
 327 }
 328
 329 // appends an ellipsis as a new closed subpath fitting the passed rectangle
 330 void wxGraphicsPath::AddCircle( wxDouble x, wxDouble y, wxDouble r )
 331 {
 332     AllocExclusive();
 333     GetPathData()->AddCircle(x,y,r);
 334 }
 335
 336 // appends a an arc to two tangents connecting (current) to (x1,y1) and (x1,y1) to (x2,y2), also a straight line from (current) to (x1,y1)
 337 void wxGraphicsPath::AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r )
 338 {
 339     GetPathData()->AddArcToPoint(x1,y1,x2,y2,r);
 340 }
 341
 342 // appends an ellipse
 343 void wxGraphicsPath::AddEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h)
 344 {
 345     AllocExclusive();
 346     GetPathData()->AddEllipse(x,y,w,h);
 347 }
 348
 349 // appends a rounded rectangle
 350 void wxGraphicsPath::AddRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius)
 351 {
 352     AllocExclusive();
 353     GetPathData()->AddRoundedRectangle(x,y,w,h,radius);
 354 }
 355
 356 // returns the native path
 357 void * wxGraphicsPath::GetNativePath() const
 358 {
 359     return GetPathData()->GetNativePath();
 360 }
 361
 362 // give the native path returned by GetNativePath() back (there might be some deallocations necessary)
 363 void wxGraphicsPath::UnGetNativePath(void *p)const
 364 {
 365     GetPathData()->UnGetNativePath(p);
 366 }
 367
 368 // transforms each point of this path by the matrix
 369 void wxGraphicsPath::Transform( const wxGraphicsMatrix& matrix )
 370 {
 371     AllocExclusive();
 372     GetPathData()->Transform(matrix.GetMatrixData());
 373 }
 374
 375 // gets the bounding box enclosing all points (possibly including control points)
 376 void wxGraphicsPath::GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const
 377 {
 378     GetPathData()->GetBox(x,y,w,h);
 379 }
 380
 381 bool wxGraphicsPath::Contains( wxDouble x, wxDouble y, int fillStyle ) const
 382 {
 383     return GetPathData()->Contains(x,y,fillStyle);
 384 }
 385
 386 //
 387 // Emulations, these mus be implemented in the ...Data classes in order to allow for proper overrides
 388 //
 389
 390 void wxGraphicsPathData::AddQuadCurveToPoint( wxDouble cx, wxDouble cy, wxDouble x, wxDouble y )
 391 {
 392     // calculate using degree elevation to a cubic bezier
 393     wxPoint2DDouble c1;
 394     wxPoint2DDouble c2;
 395
 396     wxPoint2DDouble start;
 397     GetCurrentPoint(&start.m_x,&start.m_y);
 398     wxPoint2DDouble end(x,y);
 399     wxPoint2DDouble c(cx,cy);
 400     c1 = wxDouble(1/3.0) * start + wxDouble(2/3.0) * c;
 401     c2 = wxDouble(2/3.0) * c + wxDouble(1/3.0) * end;
 402     AddCurveToPoint(c1.m_x,c1.m_y,c2.m_x,c2.m_y,x,y);
 403 }
 404
 405 void wxGraphicsPathData::AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h )
 406 {
 407     MoveToPoint(x,y);
 408     AddLineToPoint(x,y+h);
 409     AddLineToPoint(x+w,y+h);
 410     AddLineToPoint(x+w,y);
 411     CloseSubpath();
 412 }
 413
 414 void wxGraphicsPathData::AddCircle( wxDouble x, wxDouble y, wxDouble r )
 415 {
 416     MoveToPoint(x+r,y);
 417     AddArc( x,y,r,0,2*M_PI,false);
 418     CloseSubpath();
 419 }
 420
 421 void wxGraphicsPathData::AddEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h)
 422 {
 423     wxDouble rw = w/2;
 424     wxDouble rh = h/2;
 425     wxDouble xc = x + rw;
 426     wxDouble yc = y + rh;
 427     wxGraphicsMatrix m = GetRenderer()->CreateMatrix();
 428     m.Translate(xc,yc);
 429     m.Scale(rw/rh,1.0);
 430     wxGraphicsPath p = GetRenderer()->CreatePath();
 431     p.AddCircle(0,0,rh);
 432     p.Transform(m);
 433     AddPath(p.GetPathData());
 434 }
 435
 436 void wxGraphicsPathData::AddRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius)
 437 {
 438     if ( radius == 0 )
 439         AddRectangle(x,y,w,h);
 440     else
 441     {
 442         MoveToPoint( x + w, y + h / 2);
 443         AddArcToPoint(x + w, y + h, x + w / 2, y + h, radius);
 444         AddArcToPoint(x, y + h, x, y + h / 2, radius);
 445         AddArcToPoint(x, y , x + w / 2, y, radius);
 446         AddArcToPoint(x + w, y, x + w, y + h / 2, radius);
 447         CloseSubpath();
 448     }
 449 }
 450
 451 // draws a an arc to two tangents connecting (current) to (x1,y1) and (x1,y1) to (x2,y2), also a straight line from (current) to (x1,y1)
 452 void wxGraphicsPathData::AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r )
 453 {
 454     wxPoint2DDouble current;
 455     GetCurrentPoint(&current.m_x,&current.m_y);
 456     wxPoint2DDouble p1(x1,y1);
 457     wxPoint2DDouble p2(x2,y2);
 458
 459     wxPoint2DDouble v1 = current - p1;
 460     v1.Normalize();
 461     wxPoint2DDouble v2 = p2 - p1;
 462     v2.Normalize();
 463
 464     wxDouble alpha = v1.GetVectorAngle() - v2.GetVectorAngle();
 465
 466     if ( alpha < 0 )
 467         alpha = 360 + alpha;
 468     // TODO obtuse angles
 469
 470     alpha = DegToRad(alpha);
 471
 472     wxDouble dist = r / sin(alpha/2) * cos(alpha/2);
 473     // calculate tangential points
 474     wxPoint2DDouble t1 = dist*v1 + p1;
 475     wxPoint2DDouble t2 = dist*v2 + p1;
 476
 477     wxPoint2DDouble nv1 = v1;
 478     nv1.SetVectorAngle(v1.GetVectorAngle()-90);
 479     wxPoint2DDouble c = t1 + r*nv1;
 480
 481     wxDouble a1 = v1.GetVectorAngle()+90;
 482     wxDouble a2 = v2.GetVectorAngle()-90;
 483
 484     AddLineToPoint(t1.m_x,t1.m_y);
 485     AddArc(c.m_x,c.m_y,r,DegToRad(a1),DegToRad(a2),true);
 486     AddLineToPoint(p2.m_x,p2.m_y);
 487 }
 488
 489 //-----------------------------------------------------------------------------
 490 // wxGraphicsContext Convenience Methods
 491 //-----------------------------------------------------------------------------
 492
 493 IMPLEMENT_ABSTRACT_CLASS(wxGraphicsContext, wxObject)
 494
 495
 496 wxGraphicsContext::wxGraphicsContext(wxGraphicsRenderer* renderer) : wxGraphicsObject(renderer)
 497 {
 498 }
 499
 500 wxGraphicsContext::~wxGraphicsContext()
 501 {
 502 }
 503
 504 // sets the pen
 505 void wxGraphicsContext::SetPen( const wxGraphicsPen& pen )
 506 {
 507     m_pen = pen;
 508 }
 509
 510 void wxGraphicsContext::SetPen( const wxPen& pen )
 511 {
 512     if ( pen.GetStyle() == wxTRANSPARENT )
 513         SetPen( wxNullGraphicsPen );
 514     else
 515         SetPen( CreatePen( pen ) );
 516 }
 517
 518 // sets the brush for filling
 519 void wxGraphicsContext::SetBrush( const wxGraphicsBrush& brush )
 520 {
 521     m_brush = brush;
 522 }
 523
 524 void wxGraphicsContext::SetBrush( const wxBrush& brush )
 525 {
 526     if ( brush.GetStyle() == wxTRANSPARENT )
 527         SetBrush( wxNullGraphicsBrush );
 528     else
 529         SetBrush( CreateBrush( brush ) );
 530 }
 531
 532 // sets the brush for filling
 533 void wxGraphicsContext::SetFont( const wxGraphicsFont& font )
 534 {
 535     m_font = font;
 536 }
 537
 538 void wxGraphicsContext::SetFont( const wxFont& font, const wxColour& colour )
 539 {
 540     if ( font.Ok() )
 541         SetFont( CreateFont( font, colour ) );
 542     else
 543         SetFont( wxNullGraphicsFont );
 544 }
 545
 546 void wxGraphicsContext::DrawPath( const wxGraphicsPath& path, int fillStyle )
 547 {
 548     FillPath( path , fillStyle );
 549     StrokePath( path );
 550 }
 551
 552 void wxGraphicsContext::DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle )
 553 {
 554     Translate(x,y);
 555     Rotate( -angle );
 556     DrawText( str , 0, 0 );
 557     Rotate( angle );
 558     Translate(-x,-y);
 559 }
 560
 561 void wxGraphicsContext::StrokeLine( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2)
 562 {
 563     wxGraphicsPath path = CreatePath();
 564     path.MoveToPoint(x1, y1);
 565     path.AddLineToPoint( x2, y2 );
 566     StrokePath( path );
 567 }
 568
 569 void wxGraphicsContext::DrawRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h)
 570 {
 571     wxGraphicsPath path = CreatePath();
 572     path.AddRectangle( x , y , w , h );
 573     DrawPath( path );
 574 }
 575
 576 void wxGraphicsContext::DrawEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h)
 577 {
 578     wxGraphicsPath path = CreatePath();
 579     path.AddEllipse(x,y,w,h);
 580     DrawPath(path);
 581 }
 582
 583 void wxGraphicsContext::DrawRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius)
 584 {
 585     wxGraphicsPath path = CreatePath();
 586     path.AddRoundedRectangle(x,y,w,h,radius);
 587     DrawPath(path);
 588 }
 589
 590 void wxGraphicsContext::StrokeLines( size_t n, const wxPoint2DDouble *points)
 591 {
 592     wxASSERT(n > 1);
 593     wxGraphicsPath path = CreatePath();
 594     path.MoveToPoint(points[0].m_x, points[0].m_y);
 595     for ( size_t i = 1; i < n; ++i)
 596         path.AddLineToPoint( points[i].m_x, points[i].m_y );
 597     StrokePath( path );
 598 }
 599
 600 void wxGraphicsContext::DrawLines( size_t n, const wxPoint2DDouble *points, int fillStyle)
 601 {
 602     wxASSERT(n > 1);
 603     wxGraphicsPath path = CreatePath();
 604     path.MoveToPoint(points[0].m_x, points[0].m_y);
 605     for ( size_t i = 1; i < n; ++i)
 606         path.AddLineToPoint( points[i].m_x, points[i].m_y );
 607     DrawPath( path , fillStyle);
 608 }
 609
 610 void wxGraphicsContext::StrokeLines( size_t n, const wxPoint2DDouble *beginPoints, const wxPoint2DDouble *endPoints)
 611 {
 612     wxASSERT(n > 0);
 613     wxGraphicsPath path = CreatePath();
 614     for ( size_t i = 0; i < n; ++i)
 615     {
 616         path.MoveToPoint(beginPoints[i].m_x, beginPoints[i].m_y);
 617         path.AddLineToPoint( endPoints[i].m_x, endPoints[i].m_y );
 618     }
 619     StrokePath( path );
 620 }
 621
 622 // create a 'native' matrix corresponding to these values
 623 wxGraphicsMatrix wxGraphicsContext::CreateMatrix( wxDouble a, wxDouble b, wxDouble c, wxDouble d,
 624     wxDouble tx, wxDouble ty) const
 625 {
 626     return GetRenderer()->CreateMatrix(a,b,c,d,tx,ty);
 627 }
 628
 629 wxGraphicsPath wxGraphicsContext::CreatePath() const
 630 {
 631     return GetRenderer()->CreatePath();
 632 }
 633
 634 wxGraphicsPen wxGraphicsContext::CreatePen(const wxPen& pen) const
 635 {
 636     return GetRenderer()->CreatePen(pen);
 637 }
 638
 639 wxGraphicsBrush wxGraphicsContext::CreateBrush(const wxBrush& brush ) const
 640 {
 641     return GetRenderer()->CreateBrush(brush);
 642 }
 643
 644 // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
 645 wxGraphicsBrush wxGraphicsContext::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 646                                                    const wxColour&c1, const wxColour&c2) const
 647 {
 648     return GetRenderer()->CreateLinearGradientBrush(x1,y1,x2,y2,c1,c2);
 649 }
 650
 651 // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
 652 // with radius r and color cColor
 653 wxGraphicsBrush wxGraphicsContext::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 654                                                    const wxColour &oColor, const wxColour &cColor) const
 655 {
 656     return GetRenderer()->CreateRadialGradientBrush(xo,yo,xc,yc,radius,oColor,cColor);
 657 }
 658
 659 // sets the font
 660 wxGraphicsFont wxGraphicsContext::CreateFont( const wxFont &font , const wxColour &col ) const
 661 {
 662     return GetRenderer()->CreateFont(font,col);
 663 }
 664
 665 wxGraphicsContext* wxGraphicsContext::Create( const wxWindowDC& dc)
 666 {
 667     return wxGraphicsRenderer::GetDefaultRenderer()->CreateContext(dc);
 668 }
 669
 670 wxGraphicsContext* wxGraphicsContext::CreateFromNative( void * context )
 671 {
 672     return wxGraphicsRenderer::GetDefaultRenderer()->CreateContextFromNativeContext(context);
 673 }
 674
 675 wxGraphicsContext* wxGraphicsContext::CreateFromNativeWindow( void * window )
 676 {
 677     return wxGraphicsRenderer::GetDefaultRenderer()->CreateContextFromNativeWindow(window);
 678 }
 679
 680 wxGraphicsContext* wxGraphicsContext::Create( wxWindow* window )
 681 {
 682     return wxGraphicsRenderer::GetDefaultRenderer()->CreateContext(window);
 683 }
 684
 685 //-----------------------------------------------------------------------------
 686 // wxGraphicsRenderer
 687 //-----------------------------------------------------------------------------
 688
 689 IMPLEMENT_ABSTRACT_CLASS(wxGraphicsRenderer, wxObject)
 690
 691 #endif // wxUSE_GRAPHICS_CONTEXT