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 #include "wx/image.h"
  23 #include "wx/vector.h"
  24
  25 enum wxAntialiasMode
  26 {
  27     wxANTIALIAS_NONE, // should be 0
  28     wxANTIALIAS_DEFAULT
  29 };
  30
  31 enum wxInterpolationQuality
  32 {
  33     // default interpolation
  34     wxINTERPOLATION_DEFAULT,
  35     // no interpolation
  36     wxINTERPOLATION_NONE,
  37     // fast interpolation, suited for interactivity
  38     wxINTERPOLATION_FAST,
  39     // better quality
  40     wxINTERPOLATION_GOOD,
  41     // best quality, not suited for interactivity
  42     wxINTERPOLATION_BEST
  43 };
  44
  45 enum wxCompositionMode
  46 {
  47     // R = Result, S = Source, D = Destination, premultiplied with alpha
  48     // Ra, Sa, Da their alpha components
  49
  50     // classic Porter-Duff compositions
  51     // http://keithp.com/~keithp/porterduff/p253-porter.pdf
  52
  53     wxCOMPOSITION_INVALID = -1, /* indicates invalid/unsupported mode */
  54     wxCOMPOSITION_CLEAR, /* R = 0 */
  55     wxCOMPOSITION_SOURCE, /* R = S */
  56     wxCOMPOSITION_OVER, /* R = S + D*(1 - Sa) */
  57     wxCOMPOSITION_IN, /* R = S*Da */
  58     wxCOMPOSITION_OUT, /* R = S*(1 - Da) */
  59     wxCOMPOSITION_ATOP, /* R = S*Da + D*(1 - Sa) */
  60
  61     wxCOMPOSITION_DEST, /* R = D, essentially a noop */
  62     wxCOMPOSITION_DEST_OVER, /* R = S*(1 - Da) + D */
  63     wxCOMPOSITION_DEST_IN, /* R = D*Sa */
  64     wxCOMPOSITION_DEST_OUT, /* R = D*(1 - Sa) */
  65     wxCOMPOSITION_DEST_ATOP, /* R = S*(1 - Da) + D*Sa */
  66     wxCOMPOSITION_XOR, /* R = S*(1 - Da) + D*(1 - Sa) */
  67
  68     // mathematical compositions
  69     wxCOMPOSITION_ADD /* R = S + D */
  70 };
  71
  72 class WXDLLIMPEXP_FWD_CORE wxWindowDC;
  73 class WXDLLIMPEXP_FWD_CORE wxMemoryDC;
  74 #if wxUSE_PRINTING_ARCHITECTURE
  75 class WXDLLIMPEXP_FWD_CORE wxPrinterDC;
  76 #endif
  77 #ifdef __WXMSW__
  78 #if wxUSE_ENH_METAFILE
  79 class WXDLLIMPEXP_FWD_CORE wxEnhMetaFileDC;
  80 #endif
  81 #endif
  82 class WXDLLIMPEXP_FWD_CORE wxGraphicsContext;
  83 class WXDLLIMPEXP_FWD_CORE wxGraphicsPath;
  84 class WXDLLIMPEXP_FWD_CORE wxGraphicsMatrix;
  85 class WXDLLIMPEXP_FWD_CORE wxGraphicsFigure;
  86 class WXDLLIMPEXP_FWD_CORE wxGraphicsRenderer;
  87 class WXDLLIMPEXP_FWD_CORE wxGraphicsPen;
  88 class WXDLLIMPEXP_FWD_CORE wxGraphicsBrush;
  89 class WXDLLIMPEXP_FWD_CORE wxGraphicsFont;
  90 class WXDLLIMPEXP_FWD_CORE wxGraphicsBitmap;
  91
  92 /*
  93  * notes about the graphics context apis
  94  *
  95  * angles : are measured in radians, 0.0 being in direction of positiv x axis, PI/2 being
  96  * in direction of positive y axis.
  97  */
  98
  99 // Base class of all objects used for drawing in the new graphics API, the always point back to their
 100 // originating rendering engine, there is no dynamic unloading of a renderer currently allowed,
 101 // these references are not counted
 102
 103 //
 104 // The data used by objects like graphics pens etc is ref counted, in order to avoid unnecessary expensive
 105 // duplication. Any operation on a shared instance that results in a modified state, uncouples this
 106 // instance from the other instances that were shared - using copy on write semantics
 107 //
 108
 109 class WXDLLIMPEXP_FWD_CORE wxGraphicsObjectRefData;
 110 class WXDLLIMPEXP_FWD_CORE wxGraphicsMatrixData;
 111 class WXDLLIMPEXP_FWD_CORE wxGraphicsPathData;
 112
 113 class WXDLLIMPEXP_CORE wxGraphicsObject : public wxObject
 114 {
 115 public:
 116     wxGraphicsObject();
 117     wxGraphicsObject( wxGraphicsRenderer* renderer );
 118     virtual ~wxGraphicsObject();
 119
 120     bool IsNull() const;
 121
 122     // returns the renderer that was used to create this instance, or NULL if it has not been initialized yet
 123     wxGraphicsRenderer* GetRenderer() const;
 124     wxGraphicsObjectRefData* GetGraphicsData() const;
 125 protected:
 126     virtual wxObjectRefData* CreateRefData() const;
 127     virtual wxObjectRefData* CloneRefData(const wxObjectRefData* data) const;
 128
 129     DECLARE_DYNAMIC_CLASS(wxGraphicsObject)
 130 };
 131
 132 class WXDLLIMPEXP_CORE wxGraphicsPen : public wxGraphicsObject
 133 {
 134 public:
 135     wxGraphicsPen() {}
 136     virtual ~wxGraphicsPen() {}
 137 private:
 138     DECLARE_DYNAMIC_CLASS(wxGraphicsPen)
 139 };
 140
 141 extern WXDLLIMPEXP_DATA_CORE(wxGraphicsPen) wxNullGraphicsPen;
 142
 143 class WXDLLIMPEXP_CORE wxGraphicsBrush : public wxGraphicsObject
 144 {
 145 public:
 146     wxGraphicsBrush() {}
 147     virtual ~wxGraphicsBrush() {}
 148 private:
 149     DECLARE_DYNAMIC_CLASS(wxGraphicsBrush)
 150 };
 151
 152 extern WXDLLIMPEXP_DATA_CORE(wxGraphicsBrush) wxNullGraphicsBrush;
 153
 154 class WXDLLIMPEXP_CORE wxGraphicsFont : public wxGraphicsObject
 155 {
 156 public:
 157     wxGraphicsFont() {}
 158     virtual ~wxGraphicsFont() {}
 159 private:
 160     DECLARE_DYNAMIC_CLASS(wxGraphicsFont)
 161 };
 162
 163 extern WXDLLIMPEXP_DATA_CORE(wxGraphicsFont) wxNullGraphicsFont;
 164
 165 class WXDLLIMPEXP_CORE wxGraphicsBitmap : public wxGraphicsObject
 166 {
 167 public:
 168     wxGraphicsBitmap() {}
 169     virtual ~wxGraphicsBitmap() {}
 170
 171     // Convert bitmap to wxImage: this is more efficient than converting to
 172     // wxBitmap first and then to wxImage and also works without X server
 173     // connection under Unix that wxBitmap requires.
 174 #if wxUSE_IMAGE
 175     wxImage ConvertToImage() const;
 176 #endif // wxUSE_IMAGE
 177
 178 private:
 179     DECLARE_DYNAMIC_CLASS(wxGraphicsBitmap)
 180 };
 181
 182 extern WXDLLIMPEXP_DATA_CORE(wxGraphicsBitmap) wxNullGraphicsBitmap;
 183
 184 class WXDLLIMPEXP_CORE wxGraphicsMatrix : public wxGraphicsObject
 185 {
 186 public:
 187     wxGraphicsMatrix() {}
 188
 189     virtual ~wxGraphicsMatrix() {}
 190
 191     // concatenates the matrix
 192     virtual void Concat( const wxGraphicsMatrix *t );
 193     void Concat( const wxGraphicsMatrix &t ) { Concat( &t ); }
 194
 195     // sets the matrix to the respective values
 196     virtual void Set(wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 197         wxDouble tx=0.0, wxDouble ty=0.0);
 198
 199     // gets the component valuess of the matrix
 200     virtual void Get(wxDouble* a=NULL, wxDouble* b=NULL,  wxDouble* c=NULL,
 201                      wxDouble* d=NULL, wxDouble* tx=NULL, wxDouble* ty=NULL) const;
 202
 203     // makes this the inverse matrix
 204     virtual void Invert();
 205
 206     // returns true if the elements of the transformation matrix are equal ?
 207     virtual bool IsEqual( const wxGraphicsMatrix* t) const;
 208     bool IsEqual( const wxGraphicsMatrix& t) const { return IsEqual( &t ); }
 209
 210     // return true if this is the identity matrix
 211     virtual bool IsIdentity() const;
 212
 213     //
 214     // transformation
 215     //
 216
 217     // add the translation to this matrix
 218     virtual void Translate( wxDouble dx , wxDouble dy );
 219
 220     // add the scale to this matrix
 221     virtual void Scale( wxDouble xScale , wxDouble yScale );
 222
 223     // add the rotation to this matrix (radians)
 224     virtual void Rotate( wxDouble angle );
 225
 226     //
 227     // apply the transforms
 228     //
 229
 230     // applies that matrix to the point
 231     virtual void TransformPoint( wxDouble *x, wxDouble *y ) const;
 232
 233     // applies the matrix except for translations
 234     virtual void TransformDistance( wxDouble *dx, wxDouble *dy ) const;
 235
 236     // returns the native representation
 237     virtual void * GetNativeMatrix() const;
 238
 239     const wxGraphicsMatrixData* GetMatrixData() const
 240     { return (const wxGraphicsMatrixData*) GetRefData(); }
 241     wxGraphicsMatrixData* GetMatrixData()
 242     { return (wxGraphicsMatrixData*) GetRefData(); }
 243
 244 private:
 245     DECLARE_DYNAMIC_CLASS(wxGraphicsMatrix)
 246 };
 247
 248 extern WXDLLIMPEXP_DATA_CORE(wxGraphicsMatrix) wxNullGraphicsMatrix;
 249
 250 class WXDLLIMPEXP_CORE wxGraphicsPath : public wxGraphicsObject
 251 {
 252 public:
 253     wxGraphicsPath()  {}
 254     virtual ~wxGraphicsPath() {}
 255
 256     //
 257     // These are the path primitives from which everything else can be constructed
 258     //
 259
 260     // begins a new subpath at (x,y)
 261     virtual void MoveToPoint( wxDouble x, wxDouble y );
 262     void MoveToPoint( const wxPoint2DDouble& p);
 263
 264     // adds a straight line from the current point to (x,y)
 265     virtual void AddLineToPoint( wxDouble x, wxDouble y );
 266     void AddLineToPoint( const wxPoint2DDouble& p);
 267
 268     // adds a cubic Bezier curve from the current point, using two control points and an end point
 269     virtual void AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y );
 270     void AddCurveToPoint( const wxPoint2DDouble& c1, const wxPoint2DDouble& c2, const wxPoint2DDouble& e);
 271
 272     // adds another path
 273     virtual void AddPath( const wxGraphicsPath& path );
 274
 275     // closes the current sub-path
 276     virtual void CloseSubpath();
 277
 278     // gets the last point of the current path, (0,0) if not yet set
 279     virtual void GetCurrentPoint( wxDouble* x, wxDouble* y) const;
 280     wxPoint2DDouble GetCurrentPoint() const;
 281
 282     // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
 283     virtual void AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise );
 284     void AddArc( const wxPoint2DDouble& c, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise);
 285
 286     //
 287     // These are convenience functions which - if not available natively will be assembled
 288     // using the primitives from above
 289     //
 290
 291     // adds a quadratic Bezier curve from the current point, using a control point and an end point
 292     virtual void AddQuadCurveToPoint( wxDouble cx, wxDouble cy, wxDouble x, wxDouble y );
 293
 294     // appends a rectangle as a new closed subpath
 295     virtual void AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 296
 297     // appends an ellipsis as a new closed subpath fitting the passed rectangle
 298     virtual void AddCircle( wxDouble x, wxDouble y, wxDouble r );
 299
 300     // 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)
 301     virtual void AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r );
 302
 303     // appends an ellipse
 304     virtual void AddEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
 305
 306     // appends a rounded rectangle
 307     virtual void AddRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius);
 308
 309     // returns the native path
 310     virtual void * GetNativePath() const;
 311
 312     // give the native path returned by GetNativePath() back (there might be some deallocations necessary)
 313     virtual void UnGetNativePath(void *p)const;
 314
 315     // transforms each point of this path by the matrix
 316     virtual void Transform( const wxGraphicsMatrix& matrix );
 317
 318     // gets the bounding box enclosing all points (possibly including control points)
 319     virtual void GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h)const;
 320     wxRect2DDouble GetBox()const;
 321
 322     virtual bool Contains( wxDouble x, wxDouble y, wxPolygonFillMode fillStyle = wxODDEVEN_RULE)const;
 323     bool Contains( const wxPoint2DDouble& c, wxPolygonFillMode fillStyle = wxODDEVEN_RULE)const;
 324
 325     const wxGraphicsPathData* GetPathData() const
 326     { return (const wxGraphicsPathData*) GetRefData(); }
 327     wxGraphicsPathData* GetPathData()
 328     { return (wxGraphicsPathData*) GetRefData(); }
 329
 330 private:
 331     DECLARE_DYNAMIC_CLASS(wxGraphicsPath)
 332 };
 333
 334 extern WXDLLIMPEXP_DATA_CORE(wxGraphicsPath) wxNullGraphicsPath;
 335
 336
 337 // Describes a single gradient stop.
 338 class wxGraphicsGradientStop
 339 {
 340 public:
 341     wxGraphicsGradientStop(wxColour col = wxTransparentColour,
 342                            float pos = 0.)
 343         : m_col(col),
 344           m_pos(pos)
 345     {
 346     }
 347
 348     // default copy ctor, assignment operator and dtor are ok
 349
 350     const wxColour& GetColour() const { return m_col; }
 351     void SetColour(const wxColour& col) { m_col = col; }
 352
 353     float GetPosition() const { return m_pos; }
 354     void SetPosition(float pos)
 355     {
 356         wxASSERT_MSG( pos >= 0 && pos <= 1, "invalid gradient stop position" );
 357
 358         m_pos = pos;
 359     }
 360
 361 private:
 362     // The colour of this gradient band.
 363     wxColour m_col;
 364
 365     // Its starting position: 0 is the beginning and 1 is the end.
 366     float m_pos;
 367 };
 368
 369 // A collection of gradient stops ordered by their positions (from lowest to
 370 // highest). The first stop (index 0, position 0.0) is always the starting
 371 // colour and the last one (index GetCount() - 1, position 1.0) is the end
 372 // colour.
 373 class WXDLLIMPEXP_CORE wxGraphicsGradientStops
 374 {
 375 public:
 376     wxGraphicsGradientStops(wxColour startCol = wxTransparentColour,
 377                             wxColour endCol = wxTransparentColour)
 378     {
 379         // we can't use Add() here as it relies on having start/end stops as
 380         // first/last array elements so do it manually
 381         m_stops.push_back(wxGraphicsGradientStop(startCol, 0.f));
 382         m_stops.push_back(wxGraphicsGradientStop(endCol, 1.f));
 383     }
 384
 385     // default copy ctor, assignment operator and dtor are ok for this class
 386
 387
 388     // Add a stop in correct order.
 389     void Add(const wxGraphicsGradientStop& stop);
 390     void Add(wxColour col, float pos) { Add(wxGraphicsGradientStop(col, pos)); }
 391
 392     // Get the number of stops.
 393     unsigned GetCount() const { return m_stops.size(); }
 394
 395     // Return the stop at the given index (which must be valid).
 396     wxGraphicsGradientStop Item(unsigned n) const { return m_stops.at(n); }
 397
 398     // Get/set start and end colours.
 399     void SetStartColour(wxColour col)
 400         { m_stops[0].SetColour(col); }
 401     wxColour GetStartColour() const
 402         { return m_stops[0].GetColour(); }
 403     void SetEndColour(wxColour col)
 404         { m_stops[m_stops.size() - 1].SetColour(col); }
 405     wxColour GetEndColour() const
 406         { return m_stops[m_stops.size() - 1].GetColour(); }
 407
 408 private:
 409     // All the stops stored in ascending order of positions.
 410     wxVector<wxGraphicsGradientStop> m_stops;
 411 };
 412
 413 class WXDLLIMPEXP_CORE wxGraphicsContext : public wxGraphicsObject
 414 {
 415 public:
 416     wxGraphicsContext(wxGraphicsRenderer* renderer);
 417
 418     virtual ~wxGraphicsContext();
 419
 420     static wxGraphicsContext* Create( const wxWindowDC& dc);
 421     static wxGraphicsContext * Create( const wxMemoryDC& dc);
 422 #if wxUSE_PRINTING_ARCHITECTURE
 423     static wxGraphicsContext * Create( const wxPrinterDC& dc);
 424 #endif
 425 #ifdef __WXMSW__
 426 #if wxUSE_ENH_METAFILE
 427     static wxGraphicsContext * Create( const wxEnhMetaFileDC& dc);
 428 #endif
 429 #endif
 430
 431     static wxGraphicsContext* CreateFromNative( void * context );
 432
 433     static wxGraphicsContext* CreateFromNativeWindow( void * window );
 434
 435     static wxGraphicsContext* Create( wxWindow* window );
 436
 437 #if wxUSE_IMAGE
 438     // Create a context for drawing onto a wxImage. The image life time must be
 439     // greater than that of the context itself as when the context is destroyed
 440     // it will copy its contents to the specified image.
 441     static wxGraphicsContext* Create(wxImage& image);
 442 #endif // wxUSE_IMAGE
 443
 444     // create a context that can be used for measuring texts only, no drawing allowed
 445     static wxGraphicsContext * Create();
 446
 447     // begin a new document (relevant only for printing / pdf etc) if there is a progress dialog, message will be shown
 448     virtual bool StartDoc( const wxString& message );
 449
 450     // done with that document (relevant only for printing / pdf etc)
 451     virtual void EndDoc();
 452
 453     // opens a new page  (relevant only for printing / pdf etc) with the given size in points
 454     // (if both are null the default page size will be used)
 455     virtual void StartPage( wxDouble width = 0, wxDouble height = 0 );
 456
 457     // ends the current page  (relevant only for printing / pdf etc)
 458     virtual void EndPage();
 459
 460     // make sure that the current content of this context is immediately visible
 461     virtual void Flush();
 462
 463     wxGraphicsPath CreatePath() const;
 464
 465     virtual wxGraphicsPen CreatePen(const wxPen& pen) const;
 466
 467     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) const;
 468
 469     // sets the brush to a linear gradient, starting at (x1,y1) and ending at
 470     // (x2,y2) with the given boundary colours or the specified stops
 471     wxGraphicsBrush
 472     CreateLinearGradientBrush(wxDouble x1, wxDouble y1,
 473                               wxDouble x2, wxDouble y2,
 474                               const wxColour& c1, const wxColour& c2) const;
 475     wxGraphicsBrush
 476     CreateLinearGradientBrush(wxDouble x1, wxDouble y1,
 477                               wxDouble x2, wxDouble y2,
 478                               const wxGraphicsGradientStops& stops) const;
 479
 480     // sets the brush to a radial gradient originating at (xo,yc) and ending
 481     // on a circle around (xc,yc) with the given radius; the colours may be
 482     // specified by just the two extremes or the full array of gradient stops
 483     wxGraphicsBrush
 484     CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
 485                               wxDouble xc, wxDouble yc, wxDouble radius,
 486                               const wxColour& oColor, const wxColour& cColor) const;
 487
 488     wxGraphicsBrush
 489     CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
 490                               wxDouble xc, wxDouble yc, wxDouble radius,
 491                               const wxGraphicsGradientStops& stops) const;
 492
 493     // creates a font
 494     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) const;
 495     virtual wxGraphicsFont CreateFont(double sizeInPixels,
 496                                       const wxString& facename,
 497                                       int flags = wxFONTFLAG_DEFAULT,
 498                                       const wxColour& col = *wxBLACK) const;
 499
 500     // create a native bitmap representation
 501     virtual wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap ) const;
 502 #if wxUSE_IMAGE
 503     wxGraphicsBitmap CreateBitmapFromImage(const wxImage& image) const;
 504 #endif // wxUSE_IMAGE
 505
 506     // create a native bitmap representation
 507     virtual wxGraphicsBitmap CreateSubBitmap( const wxGraphicsBitmap &bitmap, wxDouble x, wxDouble y, wxDouble w, wxDouble h  ) const;
 508
 509     // create a 'native' matrix corresponding to these values
 510     virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 511         wxDouble tx=0.0, wxDouble ty=0.0) const;
 512
 513     // push the current state of the context, ie the transformation matrix on a stack
 514     virtual void PushState() = 0;
 515
 516     // pops a stored state from the stack
 517     virtual void PopState() = 0;
 518
 519     // clips drawings to the region intersected with the current clipping region
 520     virtual void Clip( const wxRegion &region ) = 0;
 521
 522     // clips drawings to the rect intersected with the current clipping region
 523     virtual void Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 524
 525     // resets the clipping to original extent
 526     virtual void ResetClip() = 0;
 527
 528     // returns the native context
 529     virtual void * GetNativeContext() = 0;
 530
 531     // returns the current shape antialiasing mode
 532     virtual wxAntialiasMode GetAntialiasMode() const { return m_antialias; }
 533
 534     // sets the antialiasing mode, returns true if it supported
 535     virtual bool SetAntialiasMode(wxAntialiasMode antialias) = 0;
 536
 537     // returns the current interpolation quality
 538     virtual wxInterpolationQuality GetInterpolationQuality() const { return m_interpolation; }
 539
 540     // sets the interpolation quality, returns true if it supported
 541     virtual bool SetInterpolationQuality(wxInterpolationQuality interpolation) = 0;
 542
 543     // returns the current compositing operator
 544     virtual wxCompositionMode GetCompositionMode() const { return m_composition; }
 545
 546     // sets the compositing operator, returns true if it supported
 547     virtual bool SetCompositionMode(wxCompositionMode op) = 0;
 548
 549     // returns the size of the graphics context in device coordinates
 550     void GetSize(wxDouble* width, wxDouble* height)
 551     {
 552         if ( width )
 553             *width = m_width;
 554         if ( height )
 555             *height = m_height;
 556     }
 557
 558     // returns the resolution of the graphics context in device points per inch
 559     virtual void GetDPI( wxDouble* dpiX, wxDouble* dpiY);
 560
 561 #if 0
 562     // sets the current alpha on this context
 563     virtual void SetAlpha( wxDouble alpha );
 564
 565     // returns the alpha on this context
 566     virtual wxDouble GetAlpha() const;
 567 #endif
 568
 569     // all rendering is done into a fully transparent temporary context
 570     virtual void BeginLayer(wxDouble opacity) = 0;
 571
 572     // composites back the drawings into the context with the opacity given at
 573     // the BeginLayer call
 574     virtual void EndLayer() = 0;
 575
 576     //
 577     // transformation : changes the current transformation matrix CTM of the context
 578     //
 579
 580     // translate
 581     virtual void Translate( wxDouble dx , wxDouble dy ) = 0;
 582
 583     // scale
 584     virtual void Scale( wxDouble xScale , wxDouble yScale ) = 0;
 585
 586     // rotate (radians)
 587     virtual void Rotate( wxDouble angle ) = 0;
 588
 589     // concatenates this transform with the current transform of this context
 590     virtual void ConcatTransform( const wxGraphicsMatrix& matrix ) = 0;
 591
 592     // sets the transform of this context
 593     virtual void SetTransform( const wxGraphicsMatrix& matrix ) = 0;
 594
 595     // gets the matrix of this context
 596     virtual wxGraphicsMatrix GetTransform() const = 0;
 597     //
 598     // setting the paint
 599     //
 600
 601     // sets the pen
 602     virtual void SetPen( const wxGraphicsPen& pen );
 603
 604     void SetPen( const wxPen& pen );
 605
 606     // sets the brush for filling
 607     virtual void SetBrush( const wxGraphicsBrush& brush );
 608
 609     void SetBrush( const wxBrush& brush );
 610
 611     // sets the font
 612     virtual void SetFont( const wxGraphicsFont& font );
 613
 614     void SetFont( const wxFont& font, const wxColour& colour );
 615
 616
 617     // strokes along a path with the current pen
 618     virtual void StrokePath( const wxGraphicsPath& path ) = 0;
 619
 620     // fills a path with the current brush
 621     virtual void FillPath( const wxGraphicsPath& path, wxPolygonFillMode fillStyle = wxODDEVEN_RULE ) = 0;
 622
 623     // draws a path by first filling and then stroking
 624     virtual void DrawPath( const wxGraphicsPath& path, wxPolygonFillMode fillStyle = wxODDEVEN_RULE );
 625
 626     //
 627     // text
 628     //
 629
 630     void DrawText( const wxString &str, wxDouble x, wxDouble y )
 631         { DoDrawText(str, x, y); }
 632
 633     void DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle )
 634         { DoDrawRotatedText(str, x, y, angle); }
 635
 636     void DrawText( const wxString &str, wxDouble x, wxDouble y,
 637                    const wxGraphicsBrush& backgroundBrush )
 638         { DoDrawFilledText(str, x, y, backgroundBrush); }
 639
 640     void DrawText( const wxString &str, wxDouble x, wxDouble y,
 641                    wxDouble angle, const wxGraphicsBrush& backgroundBrush )
 642         { DoDrawRotatedFilledText(str, x, y, angle, backgroundBrush); }
 643
 644
 645     virtual void GetTextExtent( const wxString &text, wxDouble *width, wxDouble *height,
 646         wxDouble *descent = NULL, wxDouble *externalLeading = NULL ) const  = 0;
 647
 648     virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const = 0;
 649
 650     //
 651     // image support
 652     //
 653
 654     virtual void DrawBitmap( const wxGraphicsBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 655
 656     virtual void DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 657
 658     virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 659
 660     //
 661     // convenience methods
 662     //
 663
 664     // strokes a single line
 665     virtual void StrokeLine( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2);
 666
 667     // stroke lines connecting each of the points
 668     virtual void StrokeLines( size_t n, const wxPoint2DDouble *points);
 669
 670     // stroke disconnected lines from begin to end points
 671     virtual void StrokeLines( size_t n, const wxPoint2DDouble *beginPoints, const wxPoint2DDouble *endPoints);
 672
 673     // draws a polygon
 674     virtual void DrawLines( size_t n, const wxPoint2DDouble *points, wxPolygonFillMode fillStyle = wxODDEVEN_RULE );
 675
 676     // draws a rectangle
 677     virtual void DrawRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
 678
 679     // draws an ellipse
 680     virtual void DrawEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
 681
 682     // draws a rounded rectangle
 683     virtual void DrawRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius);
 684
 685      // wrappers using wxPoint2DDouble TODO
 686
 687     // helper to determine if a 0.5 offset should be applied for the drawing operation
 688     virtual bool ShouldOffset() const { return false; }
 689
 690     // indicates whether the context should try to offset for pixel boundaries, this only makes sense on
 691     // bitmap devices like screen, by default this is turned off
 692     virtual void EnableOffset(bool enable = true);
 693
 694     void DisableOffset() { EnableOffset(false); }
 695     bool OffsetEnabled() { return m_enableOffset; }
 696
 697 protected:
 698     // These fields must be initialized in the derived class ctors.
 699     wxDouble m_width,
 700              m_height;
 701
 702     wxGraphicsPen m_pen;
 703     wxGraphicsBrush m_brush;
 704     wxGraphicsFont m_font;
 705     wxAntialiasMode m_antialias;
 706     wxCompositionMode m_composition;
 707     wxInterpolationQuality m_interpolation;
 708     bool m_enableOffset;
 709
 710 protected:
 711     // implementations of overloaded public functions: we use different names
 712     // for them to avoid the virtual function hiding problems in the derived
 713     // classes
 714     virtual void DoDrawText(const wxString& str, wxDouble x, wxDouble y) = 0;
 715     virtual void DoDrawRotatedText(const wxString& str, wxDouble x, wxDouble y,
 716                                    wxDouble angle);
 717     virtual void DoDrawFilledText(const wxString& str, wxDouble x, wxDouble y,
 718                                   const wxGraphicsBrush& backgroundBrush);
 719     virtual void DoDrawRotatedFilledText(const wxString& str,
 720                                          wxDouble x, wxDouble y,
 721                                          wxDouble angle,
 722                                          const wxGraphicsBrush& backgroundBrush);
 723
 724     wxDECLARE_NO_COPY_CLASS(wxGraphicsContext);
 725     DECLARE_ABSTRACT_CLASS(wxGraphicsContext)
 726 };
 727
 728 #if 0
 729
 730 //
 731 // A graphics figure allows to cache path, pen etc creations, also will be a basis for layering/grouping elements
 732 //
 733
 734 class WXDLLIMPEXP_CORE wxGraphicsFigure : public wxGraphicsObject
 735 {
 736 public:
 737     wxGraphicsFigure(wxGraphicsRenderer* renderer);
 738
 739     virtual ~wxGraphicsFigure();
 740
 741     void SetPath( wxGraphicsMatrix* matrix );
 742
 743     void SetMatrix( wxGraphicsPath* path);
 744
 745     // draws this object on the context
 746     virtual void Draw( wxGraphicsContext* cg );
 747
 748     // returns the path of this object
 749     wxGraphicsPath* GetPath() { return m_path; }
 750
 751     // returns the transformation matrix of this object, may be null if there is no transformation necessary
 752     wxGraphicsMatrix* GetMatrix() { return m_matrix; }
 753
 754 private:
 755     wxGraphicsMatrix* m_matrix;
 756     wxGraphicsPath* m_path;
 757
 758     DECLARE_DYNAMIC_CLASS(wxGraphicsFigure)
 759 };
 760
 761 #endif
 762
 763 //
 764 // The graphics renderer is the instance corresponding to the rendering engine used, eg there is ONE core graphics renderer
 765 // instance on OSX. This instance is pointed back to by all objects created by it. Therefore you can create eg additional
 766 // paths at any point from a given matrix etc.
 767 //
 768
 769 class WXDLLIMPEXP_CORE wxGraphicsRenderer : public wxObject
 770 {
 771 public:
 772     wxGraphicsRenderer() {}
 773
 774     virtual ~wxGraphicsRenderer() {}
 775
 776     static wxGraphicsRenderer* GetDefaultRenderer();
 777
 778     static wxGraphicsRenderer* GetCairoRenderer();
 779     // Context
 780
 781     virtual wxGraphicsContext * CreateContext( const wxWindowDC& dc) = 0;
 782     virtual wxGraphicsContext * CreateContext( const wxMemoryDC& dc) = 0;
 783 #if wxUSE_PRINTING_ARCHITECTURE
 784     virtual wxGraphicsContext * CreateContext( const wxPrinterDC& dc) = 0;
 785 #endif
 786 #ifdef __WXMSW__
 787 #if wxUSE_ENH_METAFILE
 788     virtual wxGraphicsContext * CreateContext( const wxEnhMetaFileDC& dc) = 0;
 789 #endif
 790 #endif
 791
 792     virtual wxGraphicsContext * CreateContextFromNativeContext( void * context ) = 0;
 793
 794     virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window ) = 0;
 795
 796     virtual wxGraphicsContext * CreateContext( wxWindow* window ) = 0;
 797
 798 #if wxUSE_IMAGE
 799     virtual wxGraphicsContext * CreateContextFromImage(wxImage& image) = 0;
 800 #endif // wxUSE_IMAGE
 801
 802     // create a context that can be used for measuring texts only, no drawing allowed
 803     virtual wxGraphicsContext * CreateMeasuringContext() = 0;
 804
 805     // Path
 806
 807     virtual wxGraphicsPath CreatePath() = 0;
 808
 809     // Matrix
 810
 811     virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 812         wxDouble tx=0.0, wxDouble ty=0.0) = 0;
 813
 814     // Paints
 815
 816     virtual wxGraphicsPen CreatePen(const wxPen& pen) = 0;
 817
 818     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) = 0;
 819
 820     // Gradient brush creation functions may not honour all the stops specified
 821     // stops and use just its boundary colours (this is currently the case
 822     // under OS X)
 823     virtual wxGraphicsBrush
 824     CreateLinearGradientBrush(wxDouble x1, wxDouble y1,
 825                               wxDouble x2, wxDouble y2,
 826                               const wxGraphicsGradientStops& stops) = 0;
 827
 828     virtual wxGraphicsBrush
 829     CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
 830                               wxDouble xc, wxDouble yc,
 831                               wxDouble radius,
 832                               const wxGraphicsGradientStops& stops) = 0;
 833
 834     // sets the font
 835     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) = 0;
 836     virtual wxGraphicsFont CreateFont(double sizeInPixels,
 837                                       const wxString& facename,
 838                                       int flags = wxFONTFLAG_DEFAULT,
 839                                       const wxColour& col = *wxBLACK) = 0;
 840
 841     // create a native bitmap representation
 842     virtual wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap ) = 0;
 843 #if wxUSE_IMAGE
 844     virtual wxGraphicsBitmap CreateBitmapFromImage(const wxImage& image) = 0;
 845     virtual wxImage CreateImageFromBitmap(const wxGraphicsBitmap& bmp) = 0;
 846 #endif // wxUSE_IMAGE
 847
 848     // create a graphics bitmap from a native bitmap
 849     virtual wxGraphicsBitmap CreateBitmapFromNativeBitmap( void* bitmap ) = 0;
 850
 851     // create a subimage from a native image representation
 852     virtual wxGraphicsBitmap CreateSubBitmap( const wxGraphicsBitmap &bitmap, wxDouble x, wxDouble y, wxDouble w, wxDouble h  ) = 0;
 853
 854 private:
 855     wxDECLARE_NO_COPY_CLASS(wxGraphicsRenderer);
 856     DECLARE_ABSTRACT_CLASS(wxGraphicsRenderer)
 857 };
 858
 859
 860 #if wxUSE_IMAGE
 861 inline
 862 wxImage wxGraphicsBitmap::ConvertToImage() const
 863 {
 864     wxGraphicsRenderer* renderer = GetRenderer();
 865     return renderer ? renderer->CreateImageFromBitmap(*this) : wxNullImage;
 866 }
 867 #endif // wxUSE_IMAGE
 868
 869 #endif // wxUSE_GRAPHICS_CONTEXT
 870
 871 #endif // _WX_GRAPHICS_H_