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 #include "wx/dc.h"
  22
  23 enum wxAntialiasMode
  24 {
  25     wxANTIALIAS_NONE, // should be 0
  26     wxANTIALIAS_DEFAULT,
  27 };
  28
  29 enum wxCompositionMode
  30 {
  31     // R = Result, S = Source, D = Destination, premultiplied with alpha
  32     // Ra, Sa, Da their alpha components
  33
  34     // classic Porter-Duff compositions
  35     // http://keithp.com/~keithp/porterduff/p253-porter.pdf
  36
  37     wxCOMPOSITION_CLEAR, /* R = 0 */
  38     wxCOMPOSITION_SOURCE, /* R = S */
  39     wxCOMPOSITION_OVER, /* R = S + D*(1 - Sa) */
  40     wxCOMPOSITION_IN, /* R = S*Da */
  41     wxCOMPOSITION_OUT, /* R = S*(1 - Da) */
  42     wxCOMPOSITION_ATOP, /* R = S*Da + D*(1 - Sa) */
  43
  44     wxCOMPOSITION_DEST, /* R = D, essentially a noop */
  45     wxCOMPOSITION_DEST_OVER, /* R = S*(1 - Da) + D */
  46     wxCOMPOSITION_DEST_IN, /* R = D*Sa */
  47     wxCOMPOSITION_DEST_OUT, /* R = D*(1 - Sa) */
  48     wxCOMPOSITION_DEST_ATOP, /* R = S*(1 - Da) + D*Sa */
  49     wxCOMPOSITION_XOR, /* R = S*(1 - Da) + D*(1 - Sa) */
  50
  51     // mathematical compositions
  52     wxCOMPOSITION_ADD, /* R = S + D */
  53 };
  54
  55 class WXDLLIMPEXP_FWD_CORE wxWindowDC;
  56 class WXDLLIMPEXP_FWD_CORE wxMemoryDC;
  57 #if wxUSE_PRINTING_ARCHITECTURE
  58 class WXDLLIMPEXP_FWD_CORE wxPrinterDC;
  59 #endif
  60 class WXDLLIMPEXP_FWD_CORE wxGraphicsContext;
  61 class WXDLLIMPEXP_FWD_CORE wxGraphicsPath;
  62 class WXDLLIMPEXP_FWD_CORE wxGraphicsMatrix;
  63 class WXDLLIMPEXP_FWD_CORE wxGraphicsFigure;
  64 class WXDLLIMPEXP_FWD_CORE wxGraphicsRenderer;
  65 class WXDLLIMPEXP_FWD_CORE wxGraphicsPen;
  66 class WXDLLIMPEXP_FWD_CORE wxGraphicsBrush;
  67 class WXDLLIMPEXP_FWD_CORE wxGraphicsFont;
  68 class WXDLLIMPEXP_FWD_CORE wxGraphicsBitmap;
  69
  70 /*
  71  * notes about the graphics context apis
  72  *
  73  * angles : are measured in radians, 0.0 being in direction of positiv x axis, PI/2 being
  74  * in direction of positive y axis.
  75  */
  76
  77 // Base class of all objects used for drawing in the new graphics API, the always point back to their
  78 // originating rendering engine, there is no dynamic unloading of a renderer currently allowed,
  79 // these references are not counted
  80
  81 //
  82 // The data used by objects like graphics pens etc is ref counted, in order to avoid unnecessary expensive
  83 // duplication. Any operation on a shared instance that results in a modified state, uncouples this
  84 // instance from the other instances that were shared - using copy on write semantics
  85 //
  86
  87 class WXDLLIMPEXP_FWD_CORE wxGraphicsObjectRefData;
  88 class WXDLLIMPEXP_FWD_CORE wxGraphicsMatrixData;
  89 class WXDLLIMPEXP_FWD_CORE wxGraphicsPathData;
  90
  91 class WXDLLIMPEXP_CORE wxGraphicsObject : public wxObject
  92 {
  93 public:
  94     wxGraphicsObject();
  95     wxGraphicsObject( wxGraphicsRenderer* renderer );
  96     virtual ~wxGraphicsObject();
  97
  98     bool IsNull() const;
  99
 100     // returns the renderer that was used to create this instance, or NULL if it has not been initialized yet
 101     wxGraphicsRenderer* GetRenderer() const;
 102     wxGraphicsObjectRefData* GetGraphicsData() const;
 103 protected:
 104     virtual wxObjectRefData* CreateRefData() const;
 105     virtual wxObjectRefData* CloneRefData(const wxObjectRefData* data) const;
 106
 107     DECLARE_DYNAMIC_CLASS(wxGraphicsObject)
 108 };
 109
 110 class WXDLLIMPEXP_CORE wxGraphicsPen : public wxGraphicsObject
 111 {
 112 public:
 113     wxGraphicsPen() {}
 114     virtual ~wxGraphicsPen() {}
 115 private:
 116     DECLARE_DYNAMIC_CLASS(wxGraphicsPen)
 117 };
 118
 119 extern WXDLLIMPEXP_DATA_CORE(wxGraphicsPen) wxNullGraphicsPen;
 120
 121 class WXDLLIMPEXP_CORE wxGraphicsBrush : public wxGraphicsObject
 122 {
 123 public:
 124     wxGraphicsBrush() {}
 125     virtual ~wxGraphicsBrush() {}
 126 private:
 127     DECLARE_DYNAMIC_CLASS(wxGraphicsBrush)
 128 };
 129
 130 extern WXDLLIMPEXP_DATA_CORE(wxGraphicsBrush) wxNullGraphicsBrush;
 131
 132 class WXDLLIMPEXP_CORE wxGraphicsFont : public wxGraphicsObject
 133 {
 134 public:
 135     wxGraphicsFont() {}
 136     virtual ~wxGraphicsFont() {}
 137 private:
 138     DECLARE_DYNAMIC_CLASS(wxGraphicsFont)
 139 };
 140
 141 extern WXDLLIMPEXP_DATA_CORE(wxGraphicsFont) wxNullGraphicsFont;
 142
 143 class WXDLLIMPEXP_CORE wxGraphicsBitmap : public wxGraphicsObject
 144 {
 145 public:
 146     wxGraphicsBitmap() {}
 147     virtual ~wxGraphicsBitmap() {}
 148 private:
 149     DECLARE_DYNAMIC_CLASS(wxGraphicsBitmap)
 150 };
 151
 152 extern WXDLLIMPEXP_DATA_CORE(wxGraphicsBitmap) wxNullGraphicsBitmap;
 153
 154 class WXDLLIMPEXP_CORE wxGraphicsMatrix : public wxGraphicsObject
 155 {
 156 public:
 157     wxGraphicsMatrix() {}
 158
 159     virtual ~wxGraphicsMatrix() {}
 160
 161     // concatenates the matrix
 162     virtual void Concat( const wxGraphicsMatrix *t );
 163     void Concat( const wxGraphicsMatrix &t ) { Concat( &t ); }
 164
 165     // sets the matrix to the respective values
 166     virtual void Set(wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 167         wxDouble tx=0.0, wxDouble ty=0.0);
 168
 169     // gets the component valuess of the matrix
 170     virtual void Get(wxDouble* a=NULL, wxDouble* b=NULL,  wxDouble* c=NULL,
 171                      wxDouble* d=NULL, wxDouble* tx=NULL, wxDouble* ty=NULL) const;
 172
 173     // makes this the inverse matrix
 174     virtual void Invert();
 175
 176     // returns true if the elements of the transformation matrix are equal ?
 177     virtual bool IsEqual( const wxGraphicsMatrix* t) const;
 178     bool IsEqual( const wxGraphicsMatrix& t) const { return IsEqual( &t ); }
 179
 180     // return true if this is the identity matrix
 181     virtual bool IsIdentity() const;
 182
 183     //
 184     // transformation
 185     //
 186
 187     // add the translation to this matrix
 188     virtual void Translate( wxDouble dx , wxDouble dy );
 189
 190     // add the scale to this matrix
 191     virtual void Scale( wxDouble xScale , wxDouble yScale );
 192
 193     // add the rotation to this matrix (radians)
 194     virtual void Rotate( wxDouble angle );
 195
 196     //
 197     // apply the transforms
 198     //
 199
 200     // applies that matrix to the point
 201     virtual void TransformPoint( wxDouble *x, wxDouble *y ) const;
 202
 203     // applies the matrix except for translations
 204     virtual void TransformDistance( wxDouble *dx, wxDouble *dy ) const;
 205
 206     // returns the native representation
 207     virtual void * GetNativeMatrix() const;
 208
 209     const wxGraphicsMatrixData* GetMatrixData() const
 210     { return (const wxGraphicsMatrixData*) GetRefData(); }
 211     wxGraphicsMatrixData* GetMatrixData()
 212     { return (wxGraphicsMatrixData*) GetRefData(); }
 213
 214 private:
 215     DECLARE_DYNAMIC_CLASS(wxGraphicsMatrix)
 216 };
 217
 218 extern WXDLLIMPEXP_DATA_CORE(wxGraphicsMatrix) wxNullGraphicsMatrix;
 219
 220 class WXDLLIMPEXP_CORE wxGraphicsPath : public wxGraphicsObject
 221 {
 222 public:
 223     wxGraphicsPath()  {}
 224     virtual ~wxGraphicsPath() {}
 225
 226     //
 227     // These are the path primitives from which everything else can be constructed
 228     //
 229
 230     // begins a new subpath at (x,y)
 231     virtual void MoveToPoint( wxDouble x, wxDouble y );
 232     void MoveToPoint( const wxPoint2DDouble& p);
 233
 234     // adds a straight line from the current point to (x,y)
 235     virtual void AddLineToPoint( wxDouble x, wxDouble y );
 236     void AddLineToPoint( const wxPoint2DDouble& p);
 237
 238     // adds a cubic Bezier curve from the current point, using two control points and an end point
 239     virtual void AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y );
 240     void AddCurveToPoint( const wxPoint2DDouble& c1, const wxPoint2DDouble& c2, const wxPoint2DDouble& e);
 241
 242     // adds another path
 243     virtual void AddPath( const wxGraphicsPath& path );
 244
 245     // closes the current sub-path
 246     virtual void CloseSubpath();
 247
 248     // gets the last point of the current path, (0,0) if not yet set
 249     virtual void GetCurrentPoint( wxDouble* x, wxDouble* y) const;
 250     wxPoint2DDouble GetCurrentPoint() const;
 251
 252     // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
 253     virtual void AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise );
 254     void AddArc( const wxPoint2DDouble& c, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise);
 255
 256     //
 257     // These are convenience functions which - if not available natively will be assembled
 258     // using the primitives from above
 259     //
 260
 261     // adds a quadratic Bezier curve from the current point, using a control point and an end point
 262     virtual void AddQuadCurveToPoint( wxDouble cx, wxDouble cy, wxDouble x, wxDouble y );
 263
 264     // appends a rectangle as a new closed subpath
 265     virtual void AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 266
 267     // appends an ellipsis as a new closed subpath fitting the passed rectangle
 268     virtual void AddCircle( wxDouble x, wxDouble y, wxDouble r );
 269
 270     // 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)
 271     virtual void AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r );
 272
 273     // appends an ellipse
 274     virtual void AddEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
 275
 276     // appends a rounded rectangle
 277     virtual void AddRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius);
 278
 279     // returns the native path
 280     virtual void * GetNativePath() const;
 281
 282     // give the native path returned by GetNativePath() back (there might be some deallocations necessary)
 283     virtual void UnGetNativePath(void *p)const;
 284
 285     // transforms each point of this path by the matrix
 286     virtual void Transform( const wxGraphicsMatrix& matrix );
 287
 288     // gets the bounding box enclosing all points (possibly including control points)
 289     virtual void GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h)const;
 290     wxRect2DDouble GetBox()const;
 291
 292     virtual bool Contains( wxDouble x, wxDouble y, wxPolygonFillMode fillStyle = wxODDEVEN_RULE)const;
 293     bool Contains( const wxPoint2DDouble& c, wxPolygonFillMode fillStyle = wxODDEVEN_RULE)const;
 294
 295     const wxGraphicsPathData* GetPathData() const
 296     { return (const wxGraphicsPathData*) GetRefData(); }
 297     wxGraphicsPathData* GetPathData()
 298     { return (wxGraphicsPathData*) GetRefData(); }
 299
 300 private:
 301     DECLARE_DYNAMIC_CLASS(wxGraphicsPath)
 302 };
 303
 304 extern WXDLLIMPEXP_DATA_CORE(wxGraphicsPath) wxNullGraphicsPath;
 305
 306
 307 class WXDLLIMPEXP_CORE wxGraphicsContext : public wxGraphicsObject
 308 {
 309 public:
 310     wxGraphicsContext(wxGraphicsRenderer* renderer);
 311
 312     virtual ~wxGraphicsContext();
 313
 314     static wxGraphicsContext* Create( const wxWindowDC& dc);
 315     static wxGraphicsContext * Create( const wxMemoryDC& dc);
 316 #if wxUSE_PRINTING_ARCHITECTURE
 317     static wxGraphicsContext * Create( const wxPrinterDC& dc);
 318 #endif
 319
 320     static wxGraphicsContext* CreateFromNative( void * context );
 321
 322     static wxGraphicsContext* CreateFromNativeWindow( void * window );
 323
 324     static wxGraphicsContext* Create( wxWindow* window );
 325
 326     // create a context that can be used for measuring texts only, no drawing allowed
 327     static wxGraphicsContext * Create();
 328
 329     // begin a new document (relevant only for printing / pdf etc) if there is a progress dialog, message will be shown
 330     virtual bool StartDoc( const wxString& message );
 331
 332     // done with that document (relevant only for printing / pdf etc)
 333     virtual void EndDoc();
 334
 335     // opens a new page  (relevant only for printing / pdf etc) with the given size in points
 336     // (if both are null the default page size will be used)
 337     virtual void StartPage( wxDouble width = 0, wxDouble height = 0 );
 338
 339     // ends the current page  (relevant only for printing / pdf etc)
 340     virtual void EndPage();
 341
 342     // make sure that the current content of this context is immediately visible
 343     virtual void Flush();
 344
 345     wxGraphicsPath CreatePath() const;
 346
 347     virtual wxGraphicsPen CreatePen(const wxPen& pen) const;
 348
 349     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) const;
 350
 351     // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
 352     virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 353         const wxColour&c1, const wxColour&c2) const;
 354
 355     // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
 356     // with radius r and color cColor
 357     virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 358         const wxColour &oColor, const wxColour &cColor) const;
 359
 360     // sets the font
 361     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) const;
 362
 363     // create a native bitmap representation
 364     virtual wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap ) const;
 365
 366     // create a native bitmap representation
 367     virtual wxGraphicsBitmap CreateSubBitmap( const wxGraphicsBitmap &bitmap, wxDouble x, wxDouble y, wxDouble w, wxDouble h  ) const;
 368
 369     // create a 'native' matrix corresponding to these values
 370     virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 371         wxDouble tx=0.0, wxDouble ty=0.0) const;
 372
 373     // push the current state of the context, ie the transformation matrix on a stack
 374     virtual void PushState() = 0;
 375
 376     // pops a stored state from the stack
 377     virtual void PopState() = 0;
 378
 379     // clips drawings to the region intersected with the current clipping region
 380     virtual void Clip( const wxRegion &region ) = 0;
 381
 382     // clips drawings to the rect intersected with the current clipping region
 383     virtual void Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 384
 385     // resets the clipping to original extent
 386     virtual void ResetClip() = 0;
 387
 388     // returns the native context
 389     virtual void * GetNativeContext() = 0;
 390
 391     // returns the current shape antialiasing mode
 392     virtual wxAntialiasMode GetAntialiasMode() const { return m_antialias; }
 393
 394     // sets the antialiasing mode, returns true if it supported
 395     virtual bool SetAntialiasMode(wxAntialiasMode antialias) = 0;
 396
 397     // returns the current compositing operator
 398     virtual wxCompositionMode GetCompositionMode() const { return m_composition; }
 399
 400     // sets the compositing operator, returns true if it supported
 401     virtual bool SetCompositionMode(wxCompositionMode op) = 0;
 402
 403     // returns the size of the graphics context in device coordinates
 404     virtual void GetSize( wxDouble* width, wxDouble* height);
 405
 406     // returns the resolution of the graphics context in device points per inch
 407     virtual void GetDPI( wxDouble* dpiX, wxDouble* dpiY);
 408
 409 #if 0
 410     // sets the current alpha on this context
 411     virtual void SetAlpha( wxDouble alpha );
 412
 413     // returns the alpha on this context
 414     virtual wxDouble GetAlpha() const;
 415 #endif
 416
 417     // all rendering is done into a fully transparent temporary context
 418     virtual void BeginLayer(wxDouble opacity) = 0;
 419
 420     // composites back the drawings into the content with the opacity given at
 421     // the BeginLayer call
 422     virtual void EndLayer() = 0;
 423
 424     //
 425     // transformation : changes the current transformation matrix CTM of the context
 426     //
 427
 428     // translate
 429     virtual void Translate( wxDouble dx , wxDouble dy ) = 0;
 430
 431     // scale
 432     virtual void Scale( wxDouble xScale , wxDouble yScale ) = 0;
 433
 434     // rotate (radians)
 435     virtual void Rotate( wxDouble angle ) = 0;
 436
 437     // concatenates this transform with the current transform of this context
 438     virtual void ConcatTransform( const wxGraphicsMatrix& matrix ) = 0;
 439
 440     // sets the transform of this context
 441     virtual void SetTransform( const wxGraphicsMatrix& matrix ) = 0;
 442
 443     // gets the matrix of this context
 444     virtual wxGraphicsMatrix GetTransform() const = 0;
 445     //
 446     // setting the paint
 447     //
 448
 449     // sets the pen
 450     virtual void SetPen( const wxGraphicsPen& pen );
 451
 452     void SetPen( const wxPen& pen );
 453
 454     // sets the brush for filling
 455     virtual void SetBrush( const wxGraphicsBrush& brush );
 456
 457     void SetBrush( const wxBrush& brush );
 458
 459     // sets the font
 460     virtual void SetFont( const wxGraphicsFont& font );
 461
 462     void SetFont( const wxFont& font, const wxColour& colour );
 463
 464
 465     // strokes along a path with the current pen
 466     virtual void StrokePath( const wxGraphicsPath& path ) = 0;
 467
 468     // fills a path with the current brush
 469     virtual void FillPath( const wxGraphicsPath& path, wxPolygonFillMode fillStyle = wxODDEVEN_RULE ) = 0;
 470
 471     // draws a path by first filling and then stroking
 472     virtual void DrawPath( const wxGraphicsPath& path, wxPolygonFillMode fillStyle = wxODDEVEN_RULE );
 473
 474     //
 475     // text
 476     //
 477
 478     void DrawText( const wxString &str, wxDouble x, wxDouble y )
 479         { DoDrawText(str, x, y); }
 480
 481     void DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle )
 482         { DoDrawRotatedText(str, x, y, angle); }
 483
 484     void DrawText( const wxString &str, wxDouble x, wxDouble y,
 485                    const wxGraphicsBrush& backgroundBrush )
 486         { DoDrawFilledText(str, x, y, backgroundBrush); }
 487
 488     void DrawText( const wxString &str, wxDouble x, wxDouble y,
 489                    wxDouble angle, const wxGraphicsBrush& backgroundBrush )
 490         { DoDrawRotatedFilledText(str, x, y, angle, backgroundBrush); }
 491
 492
 493     virtual void GetTextExtent( const wxString &text, wxDouble *width, wxDouble *height,
 494         wxDouble *descent, wxDouble *externalLeading ) const  = 0;
 495
 496     virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const = 0;
 497
 498     //
 499     // image support
 500     //
 501
 502 #ifndef __WXGTK20__
 503     virtual void DrawBitmap( const wxGraphicsBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 504 #endif
 505
 506     virtual void DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 507
 508     virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 509
 510     //
 511     // convenience methods
 512     //
 513
 514     // strokes a single line
 515     virtual void StrokeLine( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2);
 516
 517     // stroke lines connecting each of the points
 518     virtual void StrokeLines( size_t n, const wxPoint2DDouble *points);
 519
 520     // stroke disconnected lines from begin to end points
 521     virtual void StrokeLines( size_t n, const wxPoint2DDouble *beginPoints, const wxPoint2DDouble *endPoints);
 522
 523     // draws a polygon
 524     virtual void DrawLines( size_t n, const wxPoint2DDouble *points, wxPolygonFillMode fillStyle = wxODDEVEN_RULE );
 525
 526     // draws a rectangle
 527     virtual void DrawRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
 528
 529     // draws an ellipse
 530     virtual void DrawEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
 531
 532     // draws a rounded rectangle
 533     virtual void DrawRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius);
 534
 535      // wrappers using wxPoint2DDouble TODO
 536
 537     // helper to determine if a 0.5 offset should be applied for the drawing operation
 538     virtual bool ShouldOffset() const { return false; }
 539
 540 protected:
 541
 542     wxGraphicsPen m_pen;
 543     wxGraphicsBrush m_brush;
 544     wxGraphicsFont m_font;
 545     wxAntialiasMode m_antialias;
 546     wxCompositionMode m_composition;
 547
 548 protected:
 549     // implementations of overloaded public functions: we use different names
 550     // for them to avoid the virtual function hiding problems in the derived
 551     // classes
 552     virtual void DoDrawText(const wxString& str, wxDouble x, wxDouble y) = 0;
 553     virtual void DoDrawRotatedText(const wxString& str, wxDouble x, wxDouble y,
 554                                    wxDouble angle);
 555     virtual void DoDrawFilledText(const wxString& str, wxDouble x, wxDouble y,
 556                                   const wxGraphicsBrush& backgroundBrush);
 557     virtual void DoDrawRotatedFilledText(const wxString& str,
 558                                          wxDouble x, wxDouble y,
 559                                          wxDouble angle,
 560                                          const wxGraphicsBrush& backgroundBrush);
 561
 562     wxDECLARE_NO_COPY_CLASS(wxGraphicsContext);
 563     DECLARE_ABSTRACT_CLASS(wxGraphicsContext)
 564 };
 565
 566 #if 0
 567
 568 //
 569 // A graphics figure allows to cache path, pen etc creations, also will be a basis for layering/grouping elements
 570 //
 571
 572 class WXDLLIMPEXP_CORE wxGraphicsFigure : public wxGraphicsObject
 573 {
 574 public:
 575     wxGraphicsFigure(wxGraphicsRenderer* renderer);
 576
 577     virtual ~wxGraphicsFigure();
 578
 579     void SetPath( wxGraphicsMatrix* matrix );
 580
 581     void SetMatrix( wxGraphicsPath* path);
 582
 583     // draws this object on the context
 584     virtual void Draw( wxGraphicsContext* cg );
 585
 586     // returns the path of this object
 587     wxGraphicsPath* GetPath() { return m_path; }
 588
 589     // returns the transformation matrix of this object, may be null if there is no transformation necessary
 590     wxGraphicsMatrix* GetMatrix() { return m_matrix; }
 591
 592 private:
 593     wxGraphicsMatrix* m_matrix;
 594     wxGraphicsPath* m_path;
 595
 596     DECLARE_DYNAMIC_CLASS(wxGraphicsFigure)
 597 };
 598
 599 #endif
 600
 601 //
 602 // The graphics renderer is the instance corresponding to the rendering engine used, eg there is ONE core graphics renderer
 603 // instance on OSX. This instance is pointed back to by all objects created by it. Therefore you can create eg additional
 604 // paths at any point from a given matrix etc.
 605 //
 606
 607 class WXDLLIMPEXP_CORE wxGraphicsRenderer : public wxObject
 608 {
 609 public:
 610     wxGraphicsRenderer() {}
 611
 612     virtual ~wxGraphicsRenderer() {}
 613
 614     static wxGraphicsRenderer* GetDefaultRenderer();
 615
 616     // Context
 617
 618     virtual wxGraphicsContext * CreateContext( const wxWindowDC& dc) = 0;
 619     virtual wxGraphicsContext * CreateContext( const wxMemoryDC& dc) = 0;
 620 #if wxUSE_PRINTING_ARCHITECTURE
 621     virtual wxGraphicsContext * CreateContext( const wxPrinterDC& dc) = 0;
 622 #endif
 623
 624     virtual wxGraphicsContext * CreateContextFromNativeContext( void * context ) = 0;
 625
 626     virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window ) = 0;
 627
 628     virtual wxGraphicsContext * CreateContext( wxWindow* window ) = 0;
 629
 630     // create a context that can be used for measuring texts only, no drawing allowed
 631     virtual wxGraphicsContext * CreateMeasuringContext() = 0;
 632
 633     // Path
 634
 635     virtual wxGraphicsPath CreatePath() = 0;
 636
 637     // Matrix
 638
 639     virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 640         wxDouble tx=0.0, wxDouble ty=0.0) = 0;
 641
 642     // Paints
 643
 644     virtual wxGraphicsPen CreatePen(const wxPen& pen) = 0;
 645
 646     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) = 0;
 647
 648     // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
 649     virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 650         const wxColour&c1, const wxColour&c2) = 0;
 651
 652     // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
 653     // with radius r and color cColor
 654     virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 655         const wxColour &oColor, const wxColour &cColor) = 0;
 656
 657    // sets the font
 658     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) = 0;
 659
 660 #ifndef __WXGTK20__
 661     // create a native bitmap representation
 662     virtual wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap ) = 0;
 663
 664     // create a subimage from a native image representation
 665     virtual wxGraphicsBitmap CreateSubBitmap( const wxGraphicsBitmap &bitmap, wxDouble x, wxDouble y, wxDouble w, wxDouble h  ) = 0;
 666 #endif
 667
 668
 669 private:
 670     wxDECLARE_NO_COPY_CLASS(wxGraphicsRenderer);
 671     DECLARE_ABSTRACT_CLASS(wxGraphicsRenderer)
 672 };
 673
 674 #endif
 675
 676 #endif // _WX_GRAPHICS_H_