include/wx/graphics.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/graphics.h
   3 // Purpose:     graphics context header
   4 // Author:      Stefan Csomor
   5 // Modified by:
   6 // Created:
   7 // Copyright:   (c) Stefan Csomor
   8 // RCS-ID:      $Id$
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_GRAPHICS_H_
  13 #define _WX_GRAPHICS_H_
  14
  15 #if wxUSE_GRAPHICS_CONTEXT
  16
  17 #include "wx/geometry.h"
  18 #include "wx/dynarray.h"
  19
  20 class WXDLLIMPEXP_CORE wxWindowDC;
  21 class WXDLLIMPEXP_CORE wxMemoryDC;
  22 class WXDLLIMPEXP_CORE wxGraphicsContext;
  23 class WXDLLIMPEXP_CORE wxGraphicsPath;
  24 class WXDLLIMPEXP_CORE wxGraphicsMatrix;
  25 class WXDLLIMPEXP_CORE wxGraphicsFigure;
  26 class WXDLLIMPEXP_CORE wxGraphicsRenderer;
  27 class WXDLLIMPEXP_CORE wxGraphicsPen;
  28 class WXDLLIMPEXP_CORE wxGraphicsBrush;
  29 class WXDLLIMPEXP_CORE wxGraphicsFont;
  30
  31 /*
  32  * notes about the graphics context apis
  33  *
  34  * angles : are measured in radians, 0.0 being in direction of positiv x axis, PI/2 being
  35  * in direction of positive y axis.
  36  */
  37
  38 // Base class of all objects used for drawing in the new graphics API, the always point back to their
  39 // originating rendering engine, there is no dynamic unloading of a renderer currently allowed,
  40 // these references are not counted
  41
  42 //
  43 // The data used by objects like graphics pens etc is ref counted, in order to avoid unnecessary expensive
  44 // duplication. Any operation on a shared instance that results in a modified state, uncouples this
  45 // instance from the other instances that were shared - using copy on write semantics
  46 //
  47
  48 class WXDLLIMPEXP_CORE wxGraphicsObjectRefData : public wxObjectRefData
  49 {
  50 public :
  51     wxGraphicsObjectRefData( wxGraphicsRenderer* renderer );
  52     wxGraphicsObjectRefData( const wxGraphicsObjectRefData* data );
  53     wxGraphicsRenderer* GetRenderer() const ;
  54     virtual wxGraphicsObjectRefData* Clone() const ;
  55
  56 protected :
  57     wxGraphicsRenderer* m_renderer;
  58 } ;
  59
  60 class WXDLLIMPEXP_CORE wxGraphicsObject : public wxObject
  61 {
  62 public :
  63     wxGraphicsObject() ;
  64     wxGraphicsObject( wxGraphicsRenderer* renderer ) ;
  65     virtual ~wxGraphicsObject() ;
  66
  67     bool IsNull() const ;
  68
  69     // returns the renderer that was used to create this instance, or NULL if it has not been initialized yet
  70     wxGraphicsRenderer* GetRenderer() const ;
  71     wxGraphicsObjectRefData* GetGraphicsData() const ;
  72 protected :
  73     virtual wxObjectRefData* CreateRefData() const;
  74     virtual wxObjectRefData* CloneRefData(const wxObjectRefData* data) const;
  75
  76     DECLARE_DYNAMIC_CLASS(wxGraphicsObject)
  77 } ;
  78
  79 class WXDLLIMPEXP_CORE wxGraphicsPen : public wxGraphicsObject
  80 {
  81 public :
  82     wxGraphicsPen() {}
  83     virtual ~wxGraphicsPen() {}
  84 private :
  85     DECLARE_DYNAMIC_CLASS(wxGraphicsPen)
  86 } ;
  87
  88 extern WXDLLEXPORT_DATA(wxGraphicsPen) wxNullGraphicsPen;
  89
  90 class WXDLLIMPEXP_CORE wxGraphicsBrush : public wxGraphicsObject
  91 {
  92 public :
  93     wxGraphicsBrush() {}
  94     virtual ~wxGraphicsBrush() {}
  95 private :
  96     DECLARE_DYNAMIC_CLASS(wxGraphicsBrush)
  97 } ;
  98
  99 extern WXDLLEXPORT_DATA(wxGraphicsBrush) wxNullGraphicsBrush;
 100
 101 class WXDLLIMPEXP_CORE wxGraphicsFont : public wxGraphicsObject
 102 {
 103 public :
 104     wxGraphicsFont() {}
 105     virtual ~wxGraphicsFont() {}
 106 private :
 107     DECLARE_DYNAMIC_CLASS(wxGraphicsFont)
 108 } ;
 109
 110 extern WXDLLEXPORT_DATA(wxGraphicsFont) wxNullGraphicsFont;
 111
 112
 113 class WXDLLIMPEXP_CORE wxGraphicsMatrixData : public wxGraphicsObjectRefData
 114 {
 115 public :
 116     wxGraphicsMatrixData( wxGraphicsRenderer* renderer) :
 117        wxGraphicsObjectRefData(renderer) {}
 118
 119        virtual ~wxGraphicsMatrixData() {}
 120
 121        // concatenates the matrix
 122        virtual void Concat( const wxGraphicsMatrixData *t ) = 0;
 123
 124        // sets the matrix to the respective values
 125        virtual void Set(wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 126            wxDouble tx=0.0, wxDouble ty=0.0) = 0;
 127
 128        // gets the component valuess of the matrix
 129        virtual void Get(wxDouble* a=NULL, wxDouble* b=NULL,  wxDouble* c=NULL,
 130                         wxDouble* d=NULL, wxDouble* tx=NULL, wxDouble* ty=NULL) const = 0;
 131
 132        // makes this the inverse matrix
 133        virtual void Invert() = 0;
 134
 135        // returns true if the elements of the transformation matrix are equal ?
 136        virtual bool IsEqual( const wxGraphicsMatrixData* t) const  = 0;
 137
 138        // return true if this is the identity matrix
 139        virtual bool IsIdentity() const = 0;
 140
 141        //
 142        // transformation
 143        //
 144
 145        // add the translation to this matrix
 146        virtual void Translate( wxDouble dx , wxDouble dy ) = 0;
 147
 148        // add the scale to this matrix
 149        virtual void Scale( wxDouble xScale , wxDouble yScale ) = 0;
 150
 151        // add the rotation to this matrix (radians)
 152        virtual void Rotate( wxDouble angle ) = 0;
 153
 154        //
 155        // apply the transforms
 156        //
 157
 158        // applies that matrix to the point
 159        virtual void TransformPoint( wxDouble *x, wxDouble *y ) const = 0;
 160
 161        // applies the matrix except for translations
 162        virtual void TransformDistance( wxDouble *dx, wxDouble *dy ) const =0;
 163
 164        // returns the native representation
 165        virtual void * GetNativeMatrix() const = 0;
 166 } ;
 167
 168 class WXDLLIMPEXP_CORE wxGraphicsMatrix : public wxGraphicsObject
 169 {
 170 public :
 171     wxGraphicsMatrix() {}
 172
 173     virtual ~wxGraphicsMatrix() {}
 174
 175     // concatenates the matrix
 176     virtual void Concat( const wxGraphicsMatrix *t );
 177     void Concat( const wxGraphicsMatrix &t ) { Concat( &t ); }
 178
 179     // sets the matrix to the respective values
 180     virtual void Set(wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 181         wxDouble tx=0.0, wxDouble ty=0.0);
 182
 183     // gets the component valuess of the matrix
 184     virtual void Get(wxDouble* a=NULL, wxDouble* b=NULL,  wxDouble* c=NULL,
 185                      wxDouble* d=NULL, wxDouble* tx=NULL, wxDouble* ty=NULL) const;
 186
 187     // makes this the inverse matrix
 188     virtual void Invert();
 189
 190     // returns true if the elements of the transformation matrix are equal ?
 191     virtual bool IsEqual( const wxGraphicsMatrix* t) const;
 192     bool IsEqual( const wxGraphicsMatrix& t) const { return IsEqual( &t ); }
 193
 194     // return true if this is the identity matrix
 195     virtual bool IsIdentity() const;
 196
 197     //
 198     // transformation
 199     //
 200
 201     // add the translation to this matrix
 202     virtual void Translate( wxDouble dx , wxDouble dy );
 203
 204     // add the scale to this matrix
 205     virtual void Scale( wxDouble xScale , wxDouble yScale );
 206
 207     // add the rotation to this matrix (radians)
 208     virtual void Rotate( wxDouble angle );
 209
 210     //
 211     // apply the transforms
 212     //
 213
 214     // applies that matrix to the point
 215     virtual void TransformPoint( wxDouble *x, wxDouble *y ) const;
 216
 217     // applies the matrix except for translations
 218     virtual void TransformDistance( wxDouble *dx, wxDouble *dy ) const;
 219
 220     // returns the native representation
 221     virtual void * GetNativeMatrix() const;
 222
 223     const wxGraphicsMatrixData* GetMatrixData() const
 224     { return (const wxGraphicsMatrixData*) GetRefData(); }
 225     wxGraphicsMatrixData* GetMatrixData()
 226     { return (wxGraphicsMatrixData*) GetRefData(); }
 227
 228 private :
 229     DECLARE_DYNAMIC_CLASS(wxGraphicsMatrix)
 230 } ;
 231
 232 extern WXDLLEXPORT_DATA(wxGraphicsMatrix) wxNullGraphicsMatrix;
 233
 234 class WXDLLIMPEXP_CORE wxGraphicsPathData : public wxGraphicsObjectRefData
 235 {
 236 public :
 237     wxGraphicsPathData(wxGraphicsRenderer* renderer) : wxGraphicsObjectRefData(renderer) {}
 238     virtual ~wxGraphicsPathData() {}
 239
 240     //
 241     // These are the path primitives from which everything else can be constructed
 242     //
 243
 244     // begins a new subpath at (x,y)
 245     virtual void MoveToPoint( wxDouble x, wxDouble y ) = 0;
 246
 247     // adds a straight line from the current point to (x,y)
 248     virtual void AddLineToPoint( wxDouble x, wxDouble y ) = 0;
 249
 250     // adds a cubic Bezier curve from the current point, using two control points and an end point
 251     virtual void AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y ) = 0;
 252
 253     // adds another path
 254     virtual void AddPath( const wxGraphicsPathData* path ) =0;
 255
 256     // closes the current sub-path
 257     virtual void CloseSubpath() = 0;
 258
 259     // gets the last point of the current path, (0,0) if not yet set
 260     virtual void GetCurrentPoint( wxDouble* x, wxDouble* y) const = 0;
 261
 262     // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
 263     virtual void AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise ) = 0;
 264
 265     //
 266     // These are convenience functions which - if not available natively will be assembled
 267     // using the primitives from above
 268     //
 269
 270     // adds a quadratic Bezier curve from the current point, using a control point and an end point
 271     virtual void AddQuadCurveToPoint( wxDouble cx, wxDouble cy, wxDouble x, wxDouble y );
 272
 273     // appends a rectangle as a new closed subpath
 274     virtual void AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 275
 276     // appends an ellipsis as a new closed subpath fitting the passed rectangle
 277     virtual void AddCircle( wxDouble x, wxDouble y, wxDouble r );
 278
 279     // 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)
 280     virtual void AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r ) ;
 281
 282     // appends an ellipse
 283     virtual void AddEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
 284
 285     // appends a rounded rectangle
 286     virtual void AddRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius);
 287
 288     // returns the native path
 289     virtual void * GetNativePath() const = 0;
 290
 291     // give the native path returned by GetNativePath() back (there might be some deallocations necessary)
 292     virtual void UnGetNativePath(void *p) const= 0;
 293
 294     // transforms each point of this path by the matrix
 295     virtual void Transform( const wxGraphicsMatrixData* matrix ) =0;
 296
 297     // gets the bounding box enclosing all points (possibly including control points)
 298     virtual void GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const=0;
 299
 300     virtual bool Contains( wxDouble x, wxDouble y, int fillStyle = wxODDEVEN_RULE) const=0;
 301 };
 302
 303 class WXDLLIMPEXP_CORE wxGraphicsPath : public wxGraphicsObject
 304 {
 305 public :
 306     wxGraphicsPath()  {}
 307     virtual ~wxGraphicsPath() {}
 308
 309     //
 310     // These are the path primitives from which everything else can be constructed
 311     //
 312
 313     // begins a new subpath at (x,y)
 314     virtual void MoveToPoint( wxDouble x, wxDouble y );
 315     void MoveToPoint( const wxPoint2DDouble& p);
 316
 317     // adds a straight line from the current point to (x,y)
 318     virtual void AddLineToPoint( wxDouble x, wxDouble y );
 319     void AddLineToPoint( const wxPoint2DDouble& p);
 320
 321     // adds a cubic Bezier curve from the current point, using two control points and an end point
 322     virtual void AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y ) ;
 323     void AddCurveToPoint( const wxPoint2DDouble& c1, const wxPoint2DDouble& c2, const wxPoint2DDouble& e);
 324
 325     // adds another path
 326     virtual void AddPath( const wxGraphicsPath& path );
 327
 328     // closes the current sub-path
 329     virtual void CloseSubpath() ;
 330
 331     // gets the last point of the current path, (0,0) if not yet set
 332     virtual void GetCurrentPoint( wxDouble* x, wxDouble* y) const;
 333     wxPoint2DDouble GetCurrentPoint() const;
 334
 335     // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
 336     virtual void AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise ) ;
 337     void AddArc( const wxPoint2DDouble& c, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise);
 338
 339     //
 340     // These are convenience functions which - if not available natively will be assembled
 341     // using the primitives from above
 342     //
 343
 344     // adds a quadratic Bezier curve from the current point, using a control point and an end point
 345     virtual void AddQuadCurveToPoint( wxDouble cx, wxDouble cy, wxDouble x, wxDouble y );
 346
 347     // appends a rectangle as a new closed subpath
 348     virtual void AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 349
 350     // appends an ellipsis as a new closed subpath fitting the passed rectangle
 351     virtual void AddCircle( wxDouble x, wxDouble y, wxDouble r );
 352
 353     // 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)
 354     virtual void AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r ) ;
 355
 356     // appends an ellipse
 357     virtual void AddEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
 358
 359     // appends a rounded rectangle
 360     virtual void AddRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius);
 361
 362     // returns the native path
 363     virtual void * GetNativePath() const;
 364
 365     // give the native path returned by GetNativePath() back (there might be some deallocations necessary)
 366     virtual void UnGetNativePath(void *p)const;
 367
 368     // transforms each point of this path by the matrix
 369     virtual void Transform( const wxGraphicsMatrix& matrix );
 370
 371     // gets the bounding box enclosing all points (possibly including control points)
 372     virtual void GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h)const;
 373     wxRect2DDouble GetBox()const;
 374
 375     virtual bool Contains( wxDouble x, wxDouble y, int fillStyle = wxODDEVEN_RULE)const;
 376     bool Contains( const wxPoint2DDouble& c, int fillStyle = wxODDEVEN_RULE)const;
 377
 378     const wxGraphicsPathData* GetPathData() const
 379     { return (const wxGraphicsPathData*) GetRefData(); }
 380     wxGraphicsPathData* GetPathData()
 381     { return (wxGraphicsPathData*) GetRefData(); }
 382
 383 private :
 384     DECLARE_DYNAMIC_CLASS(wxGraphicsPath)
 385 } ;
 386
 387 extern WXDLLEXPORT_DATA(wxGraphicsPath) wxNullGraphicsPath;
 388
 389
 390 class WXDLLIMPEXP_CORE wxGraphicsContext : public wxGraphicsObject
 391 {
 392 public:
 393     wxGraphicsContext(wxGraphicsRenderer* renderer);
 394
 395     virtual ~wxGraphicsContext();
 396
 397     static wxGraphicsContext* Create( const wxWindowDC& dc) ;
 398
 399 #ifdef __WXMSW__
 400     static wxGraphicsContext * Create( const wxMemoryDC& dc) ;
 401 #endif
 402
 403     static wxGraphicsContext* CreateFromNative( void * context ) ;
 404
 405     static wxGraphicsContext* CreateFromNativeWindow( void * window ) ;
 406
 407     static wxGraphicsContext* Create( wxWindow* window ) ;
 408
 409     // create a context that can be used for measuring texts only, no drawing allowed
 410     static wxGraphicsContext * Create();
 411
 412     wxGraphicsPath CreatePath() const;
 413
 414     virtual wxGraphicsPen CreatePen(const wxPen& pen) const;
 415
 416     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) const;
 417
 418     // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
 419     virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 420         const wxColour&c1, const wxColour&c2) const;
 421
 422     // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
 423     // with radius r and color cColor
 424     virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 425         const wxColour &oColor, const wxColour &cColor) const;
 426
 427     // sets the font
 428     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) const;
 429
 430     // create a 'native' matrix corresponding to these values
 431     virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 432         wxDouble tx=0.0, wxDouble ty=0.0) const;
 433
 434     // push the current state of the context, ie the transformation matrix on a stack
 435     virtual void PushState() = 0;
 436
 437     // pops a stored state from the stack
 438     virtual void PopState() = 0;
 439
 440     // clips drawings to the region, combined to current clipping region
 441     virtual void Clip( const wxRegion &region ) = 0;
 442
 443     // clips drawings to the rect
 444     virtual void Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 445
 446     // resets the clipping to original extent
 447     virtual void ResetClip() = 0 ;
 448
 449     // returns the native context
 450     virtual void * GetNativeContext() = 0;
 451
 452     // returns the current logical function
 453     virtual int GetLogicalFunction() const { return m_logicalFunction; }
 454
 455     // sets the current logical function, returns true if it supported
 456     virtual bool SetLogicalFunction(int function) ;
 457
 458     //
 459     // transformation : changes the current transformation matrix CTM of the context
 460     //
 461
 462     // translate
 463     virtual void Translate( wxDouble dx , wxDouble dy ) = 0;
 464
 465     // scale
 466     virtual void Scale( wxDouble xScale , wxDouble yScale ) = 0;
 467
 468     // rotate (radians)
 469     virtual void Rotate( wxDouble angle ) = 0;
 470
 471     // concatenates this transform with the current transform of this context
 472     virtual void ConcatTransform( const wxGraphicsMatrix& matrix ) = 0;
 473
 474     // sets the transform of this context
 475     virtual void SetTransform( const wxGraphicsMatrix& matrix ) = 0;
 476
 477     // gets the matrix of this context
 478     virtual wxGraphicsMatrix GetTransform() const = 0;
 479     //
 480     // setting the paint
 481     //
 482
 483     // sets the pen
 484     virtual void SetPen( const wxGraphicsPen& pen );
 485
 486     void SetPen( const wxPen& pen );
 487
 488     // sets the brush for filling
 489     virtual void SetBrush( const wxGraphicsBrush& brush );
 490
 491     void SetBrush( const wxBrush& brush );
 492
 493     // sets the font
 494     virtual void SetFont( const wxGraphicsFont& font );
 495
 496     void SetFont( const wxFont& font, const wxColour& colour );
 497
 498
 499     // strokes along a path with the current pen
 500     virtual void StrokePath( const wxGraphicsPath& path ) = 0;
 501
 502     // fills a path with the current brush
 503     virtual void FillPath( const wxGraphicsPath& path, int fillStyle = wxODDEVEN_RULE ) = 0;
 504
 505     // draws a path by first filling and then stroking
 506     virtual void DrawPath( const wxGraphicsPath& path, int fillStyle = wxODDEVEN_RULE );
 507
 508     //
 509     // text
 510     //
 511
 512     virtual void DrawText( const wxString &str, wxDouble x, wxDouble y ) = 0;
 513
 514     virtual void DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle );
 515
 516     virtual void DrawText( const wxString &str, wxDouble x, wxDouble y, const wxGraphicsBrush& backgroundBrush ) ;
 517
 518     virtual void DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle, const wxGraphicsBrush& backgroundBrush );
 519
 520     virtual void GetTextExtent( const wxString &text, wxDouble *width, wxDouble *height,
 521         wxDouble *descent, wxDouble *externalLeading ) const  = 0;
 522
 523     virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const = 0;
 524
 525     //
 526     // image support
 527     //
 528
 529     virtual void DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 530
 531     virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 532
 533     //
 534     // convenience methods
 535     //
 536
 537     // strokes a single line
 538     virtual void StrokeLine( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2);
 539
 540     // stroke lines connecting each of the points
 541     virtual void StrokeLines( size_t n, const wxPoint2DDouble *points);
 542
 543     // stroke disconnected lines from begin to end points
 544     virtual void StrokeLines( size_t n, const wxPoint2DDouble *beginPoints, const wxPoint2DDouble *endPoints);
 545
 546     // draws a polygon
 547     virtual void DrawLines( size_t n, const wxPoint2DDouble *points, int fillStyle = wxODDEVEN_RULE );
 548
 549     // draws a polygon
 550     virtual void DrawRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
 551
 552     // draws an ellipse
 553     virtual void DrawEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
 554
 555     // draws a rounded rectangle
 556     virtual void DrawRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius);
 557
 558      // wrappers using wxPoint2DDouble TODO
 559
 560     // helper to determine if a 0.5 offset should be applied for the drawing operation
 561     virtual bool ShouldOffset() const { return false; }
 562
 563 protected :
 564
 565     wxGraphicsPen m_pen;
 566     wxGraphicsBrush m_brush;
 567     wxGraphicsFont m_font;
 568     int m_logicalFunction;
 569
 570 private :
 571     DECLARE_NO_COPY_CLASS(wxGraphicsContext)
 572     DECLARE_ABSTRACT_CLASS(wxGraphicsContext)
 573 };
 574
 575 #if 0
 576
 577 //
 578 // A graphics figure allows to cache path, pen etc creations, also will be a basis for layering/grouping elements
 579 //
 580
 581 class WXDLLIMPEXP_CORE wxGraphicsFigure : public wxGraphicsObject
 582 {
 583 public :
 584     wxGraphicsFigure(wxGraphicsRenderer* renderer) ;
 585
 586     virtual ~wxGraphicsFigure() ;
 587
 588     void SetPath( wxGraphicsMatrix* matrix );
 589
 590     void SetMatrix( wxGraphicsPath* path);
 591
 592     // draws this object on the context
 593     virtual void Draw( wxGraphicsContext* cg );
 594
 595     // returns the path of this object
 596     wxGraphicsPath* GetPath() { return m_path; }
 597
 598     // returns the transformation matrix of this object, may be null if there is no transformation necessary
 599     wxGraphicsMatrix* GetMatrix() { return m_matrix; }
 600
 601 private :
 602     wxGraphicsMatrix* m_matrix;
 603     wxGraphicsPath* m_path;
 604
 605     DECLARE_DYNAMIC_CLASS(wxGraphicsFigure)
 606 } ;
 607
 608 #endif
 609
 610 //
 611 // The graphics renderer is the instance corresponding to the rendering engine used, eg there is ONE core graphics renderer
 612 // instance on OSX. This instance is pointed back to by all objects created by it. Therefore you can create eg additional
 613 // paths at any point from a given matrix etc.
 614 //
 615
 616 class WXDLLIMPEXP_CORE wxGraphicsRenderer : public wxObject
 617 {
 618 public :
 619     wxGraphicsRenderer() {}
 620
 621     virtual ~wxGraphicsRenderer() {}
 622
 623     static wxGraphicsRenderer* GetDefaultRenderer();
 624
 625     // Context
 626
 627     virtual wxGraphicsContext * CreateContext( const wxWindowDC& dc) = 0 ;
 628 #ifdef __WXMSW__
 629     virtual wxGraphicsContext * CreateContext( const wxMemoryDC& dc) = 0 ;
 630 #endif
 631     virtual wxGraphicsContext * CreateContextFromNativeContext( void * context ) = 0;
 632
 633     virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window ) = 0;
 634
 635     virtual wxGraphicsContext * CreateContext( wxWindow* window ) = 0;
 636
 637     // create a context that can be used for measuring texts only, no drawing allowed
 638     virtual wxGraphicsContext * CreateMeasuringContext() = 0;
 639
 640     // Path
 641
 642     virtual wxGraphicsPath CreatePath() = 0;
 643
 644     // Matrix
 645
 646     virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 647         wxDouble tx=0.0, wxDouble ty=0.0) = 0;
 648
 649     // Paints
 650
 651     virtual wxGraphicsPen CreatePen(const wxPen& pen) = 0 ;
 652
 653     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) = 0 ;
 654
 655     // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
 656     virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 657         const wxColour&c1, const wxColour&c2) = 0;
 658
 659     // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
 660     // with radius r and color cColor
 661     virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 662         const wxColour &oColor, const wxColour &cColor) = 0;
 663
 664    // sets the font
 665     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) = 0;
 666
 667 private :
 668     DECLARE_NO_COPY_CLASS(wxGraphicsRenderer)
 669     DECLARE_ABSTRACT_CLASS(wxGraphicsRenderer)
 670 } ;
 671
 672 #endif
 673
 674 #endif // _WX_GRAPHICS_H_