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