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