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