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1 /////////////////////////////////////////////////////////////////////////////
2 // Name: wx/graphics.h
3 // Purpose: graphics context header
4 // Author: Stefan Csomor
5 // Modified by:
6 // Created:
7 // Copyright: (c) Stefan Csomor
8 // RCS-ID: $Id$
9 // Licence: wxWindows licence
10 /////////////////////////////////////////////////////////////////////////////
11
12 #ifndef _WX_GRAPHICS_H_
13 #define _WX_GRAPHICS_H_
14
15 #include "wx/defs.h"
16
17 #if wxUSE_GRAPHICS_CONTEXT
18
19 #include "wx/geometry.h"
20 #include "wx/dynarray.h"
21
22 class WXDLLIMPEXP_FWD_CORE wxWindowDC;
23 class WXDLLIMPEXP_FWD_CORE wxMemoryDC;
24 class WXDLLIMPEXP_FWD_CORE wxGraphicsContext;
25 class WXDLLIMPEXP_FWD_CORE wxGraphicsPath;
26 class WXDLLIMPEXP_FWD_CORE wxGraphicsMatrix;
27 class WXDLLIMPEXP_FWD_CORE wxGraphicsFigure;
28 class WXDLLIMPEXP_FWD_CORE wxGraphicsRenderer;
29 class WXDLLIMPEXP_FWD_CORE wxGraphicsPen;
30 class WXDLLIMPEXP_FWD_CORE wxGraphicsBrush;
31 class WXDLLIMPEXP_FWD_CORE wxGraphicsFont;
32
33 /*
34 * notes about the graphics context apis
35 *
36 * angles : are measured in radians, 0.0 being in direction of positiv x axis, PI/2 being
37 * in direction of positive y axis.
38 */
39
40 // Base class of all objects used for drawing in the new graphics API, the always point back to their
41 // originating rendering engine, there is no dynamic unloading of a renderer currently allowed,
42 // these references are not counted
43
44 //
45 // The data used by objects like graphics pens etc is ref counted, in order to avoid unnecessary expensive
46 // duplication. Any operation on a shared instance that results in a modified state, uncouples this
47 // instance from the other instances that were shared - using copy on write semantics
48 //
49
50 class WXDLLIMPEXP_FWD_CORE wxGraphicsObjectRefData;
51 class WXDLLIMPEXP_FWD_CORE wxGraphicsMatrixData;
52 class WXDLLIMPEXP_FWD_CORE wxGraphicsPathData;
53
54 class WXDLLIMPEXP_CORE wxGraphicsObject : public wxObject
55 {
56 public :
57 wxGraphicsObject() ;
58 wxGraphicsObject( wxGraphicsRenderer* renderer ) ;
59 virtual ~wxGraphicsObject() ;
60
61 bool IsNull() const ;
62
63 // returns the renderer that was used to create this instance, or NULL if it has not been initialized yet
64 wxGraphicsRenderer* GetRenderer() const ;
65 wxGraphicsObjectRefData* GetGraphicsData() const ;
66 protected :
67 virtual wxObjectRefData* CreateRefData() const;
68 virtual wxObjectRefData* CloneRefData(const wxObjectRefData* data) const;
69
70 DECLARE_DYNAMIC_CLASS(wxGraphicsObject)
71 } ;
72
73 class WXDLLIMPEXP_CORE wxGraphicsPen : public wxGraphicsObject
74 {
75 public :
76 wxGraphicsPen() {}
77 virtual ~wxGraphicsPen() {}
78 private :
79 DECLARE_DYNAMIC_CLASS(wxGraphicsPen)
80 } ;
81
82 extern WXDLLEXPORT_DATA(wxGraphicsPen) wxNullGraphicsPen;
83
84 class WXDLLIMPEXP_CORE wxGraphicsBrush : public wxGraphicsObject
85 {
86 public :
87 wxGraphicsBrush() {}
88 virtual ~wxGraphicsBrush() {}
89 private :
90 DECLARE_DYNAMIC_CLASS(wxGraphicsBrush)
91 } ;
92
93 extern WXDLLEXPORT_DATA(wxGraphicsBrush) wxNullGraphicsBrush;
94
95 class WXDLLIMPEXP_CORE wxGraphicsFont : public wxGraphicsObject
96 {
97 public :
98 wxGraphicsFont() {}
99 virtual ~wxGraphicsFont() {}
100 private :
101 DECLARE_DYNAMIC_CLASS(wxGraphicsFont)
102 } ;
103
104 extern WXDLLEXPORT_DATA(wxGraphicsFont) wxNullGraphicsFont;
105
106 class WXDLLIMPEXP_CORE wxGraphicsMatrix : public wxGraphicsObject
107 {
108 public :
109 wxGraphicsMatrix() {}
110
111 virtual ~wxGraphicsMatrix() {}
112
113 // concatenates the matrix
114 virtual void Concat( const wxGraphicsMatrix *t );
115 void Concat( const wxGraphicsMatrix &t ) { Concat( &t ); }
116
117 // sets the matrix to the respective values
118 virtual void Set(wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
119 wxDouble tx=0.0, wxDouble ty=0.0);
120
121 // gets the component valuess of the matrix
122 virtual void Get(wxDouble* a=NULL, wxDouble* b=NULL, wxDouble* c=NULL,
123 wxDouble* d=NULL, wxDouble* tx=NULL, wxDouble* ty=NULL) const;
124
125 // makes this the inverse matrix
126 virtual void Invert();
127
128 // returns true if the elements of the transformation matrix are equal ?
129 virtual bool IsEqual( const wxGraphicsMatrix* t) const;
130 bool IsEqual( const wxGraphicsMatrix& t) const { return IsEqual( &t ); }
131
132 // return true if this is the identity matrix
133 virtual bool IsIdentity() const;
134
135 //
136 // transformation
137 //
138
139 // add the translation to this matrix
140 virtual void Translate( wxDouble dx , wxDouble dy );
141
142 // add the scale to this matrix
143 virtual void Scale( wxDouble xScale , wxDouble yScale );
144
145 // add the rotation to this matrix (radians)
146 virtual void Rotate( wxDouble angle );
147
148 //
149 // apply the transforms
150 //
151
152 // applies that matrix to the point
153 virtual void TransformPoint( wxDouble *x, wxDouble *y ) const;
154
155 // applies the matrix except for translations
156 virtual void TransformDistance( wxDouble *dx, wxDouble *dy ) const;
157
158 // returns the native representation
159 virtual void * GetNativeMatrix() const;
160
161 const wxGraphicsMatrixData* GetMatrixData() const
162 { return (const wxGraphicsMatrixData*) GetRefData(); }
163 wxGraphicsMatrixData* GetMatrixData()
164 { return (wxGraphicsMatrixData*) GetRefData(); }
165
166 private :
167 DECLARE_DYNAMIC_CLASS(wxGraphicsMatrix)
168 } ;
169
170 extern WXDLLEXPORT_DATA(wxGraphicsMatrix) wxNullGraphicsMatrix;
171
172 class WXDLLIMPEXP_CORE wxGraphicsPath : public wxGraphicsObject
173 {
174 public :
175 wxGraphicsPath() {}
176 virtual ~wxGraphicsPath() {}
177
178 //
179 // These are the path primitives from which everything else can be constructed
180 //
181
182 // begins a new subpath at (x,y)
183 virtual void MoveToPoint( wxDouble x, wxDouble y );
184 void MoveToPoint( const wxPoint2DDouble& p);
185
186 // adds a straight line from the current point to (x,y)
187 virtual void AddLineToPoint( wxDouble x, wxDouble y );
188 void AddLineToPoint( const wxPoint2DDouble& p);
189
190 // adds a cubic Bezier curve from the current point, using two control points and an end point
191 virtual void AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y ) ;
192 void AddCurveToPoint( const wxPoint2DDouble& c1, const wxPoint2DDouble& c2, const wxPoint2DDouble& e);
193
194 // adds another path
195 virtual void AddPath( const wxGraphicsPath& path );
196
197 // closes the current sub-path
198 virtual void CloseSubpath() ;
199
200 // gets the last point of the current path, (0,0) if not yet set
201 virtual void GetCurrentPoint( wxDouble* x, wxDouble* y) const;
202 wxPoint2DDouble GetCurrentPoint() const;
203
204 // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
205 virtual void AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise ) ;
206 void AddArc( const wxPoint2DDouble& c, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise);
207
208 //
209 // These are convenience functions which - if not available natively will be assembled
210 // using the primitives from above
211 //
212
213 // adds a quadratic Bezier curve from the current point, using a control point and an end point
214 virtual void AddQuadCurveToPoint( wxDouble cx, wxDouble cy, wxDouble x, wxDouble y );
215
216 // appends a rectangle as a new closed subpath
217 virtual void AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h );
218
219 // appends an ellipsis as a new closed subpath fitting the passed rectangle
220 virtual void AddCircle( wxDouble x, wxDouble y, wxDouble r );
221
222 // 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)
223 virtual void AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r ) ;
224
225 // appends an ellipse
226 virtual void AddEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
227
228 // appends a rounded rectangle
229 virtual void AddRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius);
230
231 // returns the native path
232 virtual void * GetNativePath() const;
233
234 // give the native path returned by GetNativePath() back (there might be some deallocations necessary)
235 virtual void UnGetNativePath(void *p)const;
236
237 // transforms each point of this path by the matrix
238 virtual void Transform( const wxGraphicsMatrix& matrix );
239
240 // gets the bounding box enclosing all points (possibly including control points)
241 virtual void GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h)const;
242 wxRect2DDouble GetBox()const;
243
244 virtual bool Contains( wxDouble x, wxDouble y, int fillStyle = wxODDEVEN_RULE)const;
245 bool Contains( const wxPoint2DDouble& c, int fillStyle = wxODDEVEN_RULE)const;
246
247 const wxGraphicsPathData* GetPathData() const
248 { return (const wxGraphicsPathData*) GetRefData(); }
249 wxGraphicsPathData* GetPathData()
250 { return (wxGraphicsPathData*) GetRefData(); }
251
252 private :
253 DECLARE_DYNAMIC_CLASS(wxGraphicsPath)
254 } ;
255
256 extern WXDLLEXPORT_DATA(wxGraphicsPath) wxNullGraphicsPath;
257
258
259 class WXDLLIMPEXP_CORE wxGraphicsContext : public wxGraphicsObject
260 {
261 public:
262 wxGraphicsContext(wxGraphicsRenderer* renderer);
263
264 virtual ~wxGraphicsContext();
265
266 static wxGraphicsContext* Create( const wxWindowDC& dc) ;
267 static wxGraphicsContext * Create( const wxMemoryDC& dc) ;
268
269 static wxGraphicsContext* CreateFromNative( void * context ) ;
270
271 static wxGraphicsContext* CreateFromNativeWindow( void * window ) ;
272
273 static wxGraphicsContext* Create( wxWindow* window ) ;
274
275 // create a context that can be used for measuring texts only, no drawing allowed
276 static wxGraphicsContext * Create();
277
278 // begin a new document (relevant only for printing / pdf etc) if there is a progress dialog, message will be shown
279 virtual bool StartDoc( const wxString& message ) ;
280
281 // done with that document (relevant only for printing / pdf etc)
282 virtual void EndDoc();
283
284 // opens a new page (relevant only for printing / pdf etc) with the given size in points
285 // (if both are null the default page size will be used)
286 virtual void StartPage( wxDouble width = 0, wxDouble height = 0 );
287
288 // ends the current page (relevant only for printing / pdf etc)
289 virtual void EndPage();
290
291 // make sure that the current content of this context is immediately visible
292 virtual void Flush();
293
294 wxGraphicsPath CreatePath() const;
295
296 virtual wxGraphicsPen CreatePen(const wxPen& pen) const;
297
298 virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) const;
299
300 // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
301 virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
302 const wxColour&c1, const wxColour&c2) const;
303
304 // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
305 // with radius r and color cColor
306 virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
307 const wxColour &oColor, const wxColour &cColor) const;
308
309 // sets the font
310 virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) const;
311
312 // create a 'native' matrix corresponding to these values
313 virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
314 wxDouble tx=0.0, wxDouble ty=0.0) const;
315
316 // push the current state of the context, ie the transformation matrix on a stack
317 virtual void PushState() = 0;
318
319 // pops a stored state from the stack
320 virtual void PopState() = 0;
321
322 // clips drawings to the region intersected with the current clipping region
323 virtual void Clip( const wxRegion &region ) = 0;
324
325 // clips drawings to the rect intersected with the current clipping region
326 virtual void Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
327
328 // resets the clipping to original extent
329 virtual void ResetClip() = 0 ;
330
331 // returns the native context
332 virtual void * GetNativeContext() = 0;
333
334 // returns the current logical function
335 virtual int GetLogicalFunction() const { return m_logicalFunction; }
336
337 // sets the current logical function, returns true if it supported
338 virtual bool SetLogicalFunction(int function) ;
339
340 // returns the size of the graphics context in device coordinates
341 virtual void GetSize( wxDouble* width, wxDouble* height);
342
343 // returns the resolution of the graphics context in device points per inch
344 virtual void GetDPI( wxDouble* dpiX, wxDouble* dpiY);
345
346 #if 0
347 // sets the current alpha on this context
348 virtual void SetAlpha( wxDouble alpha );
349
350 // returns the alpha on this context
351 virtual wxDouble GetAlpha() const;
352 #endif
353 //
354 // transformation : changes the current transformation matrix CTM of the context
355 //
356
357 // translate
358 virtual void Translate( wxDouble dx , wxDouble dy ) = 0;
359
360 // scale
361 virtual void Scale( wxDouble xScale , wxDouble yScale ) = 0;
362
363 // rotate (radians)
364 virtual void Rotate( wxDouble angle ) = 0;
365
366 // concatenates this transform with the current transform of this context
367 virtual void ConcatTransform( const wxGraphicsMatrix& matrix ) = 0;
368
369 // sets the transform of this context
370 virtual void SetTransform( const wxGraphicsMatrix& matrix ) = 0;
371
372 // gets the matrix of this context
373 virtual wxGraphicsMatrix GetTransform() const = 0;
374 //
375 // setting the paint
376 //
377
378 // sets the pen
379 virtual void SetPen( const wxGraphicsPen& pen );
380
381 void SetPen( const wxPen& pen );
382
383 // sets the brush for filling
384 virtual void SetBrush( const wxGraphicsBrush& brush );
385
386 void SetBrush( const wxBrush& brush );
387
388 // sets the font
389 virtual void SetFont( const wxGraphicsFont& font );
390
391 void SetFont( const wxFont& font, const wxColour& colour );
392
393
394 // strokes along a path with the current pen
395 virtual void StrokePath( const wxGraphicsPath& path ) = 0;
396
397 // fills a path with the current brush
398 virtual void FillPath( const wxGraphicsPath& path, int fillStyle = wxODDEVEN_RULE ) = 0;
399
400 // draws a path by first filling and then stroking
401 virtual void DrawPath( const wxGraphicsPath& path, int fillStyle = wxODDEVEN_RULE );
402
403 //
404 // text
405 //
406
407 virtual void DrawText( const wxString &str, wxDouble x, wxDouble y ) = 0;
408
409 virtual void DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle );
410
411 virtual void DrawText( const wxString &str, wxDouble x, wxDouble y, const wxGraphicsBrush& backgroundBrush ) ;
412
413 virtual void DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle, const wxGraphicsBrush& backgroundBrush );
414
415 virtual void GetTextExtent( const wxString &text, wxDouble *width, wxDouble *height,
416 wxDouble *descent, wxDouble *externalLeading ) const = 0;
417
418 virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const = 0;
419
420 //
421 // image support
422 //
423
424 virtual void DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
425
426 virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
427
428 //
429 // convenience methods
430 //
431
432 // strokes a single line
433 virtual void StrokeLine( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2);
434
435 // stroke lines connecting each of the points
436 virtual void StrokeLines( size_t n, const wxPoint2DDouble *points);
437
438 // stroke disconnected lines from begin to end points
439 virtual void StrokeLines( size_t n, const wxPoint2DDouble *beginPoints, const wxPoint2DDouble *endPoints);
440
441 // draws a polygon
442 virtual void DrawLines( size_t n, const wxPoint2DDouble *points, int fillStyle = wxODDEVEN_RULE );
443
444 // draws a polygon
445 virtual void DrawRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
446
447 // draws an ellipse
448 virtual void DrawEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
449
450 // draws a rounded rectangle
451 virtual void DrawRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius);
452
453 // wrappers using wxPoint2DDouble TODO
454
455 // helper to determine if a 0.5 offset should be applied for the drawing operation
456 virtual bool ShouldOffset() const { return false; }
457
458 protected :
459
460 wxGraphicsPen m_pen;
461 wxGraphicsBrush m_brush;
462 wxGraphicsFont m_font;
463 int m_logicalFunction;
464
465 private :
466 DECLARE_NO_COPY_CLASS(wxGraphicsContext)
467 DECLARE_ABSTRACT_CLASS(wxGraphicsContext)
468 };
469
470 #if 0
471
472 //
473 // A graphics figure allows to cache path, pen etc creations, also will be a basis for layering/grouping elements
474 //
475
476 class WXDLLIMPEXP_CORE wxGraphicsFigure : public wxGraphicsObject
477 {
478 public :
479 wxGraphicsFigure(wxGraphicsRenderer* renderer) ;
480
481 virtual ~wxGraphicsFigure() ;
482
483 void SetPath( wxGraphicsMatrix* matrix );
484
485 void SetMatrix( wxGraphicsPath* path);
486
487 // draws this object on the context
488 virtual void Draw( wxGraphicsContext* cg );
489
490 // returns the path of this object
491 wxGraphicsPath* GetPath() { return m_path; }
492
493 // returns the transformation matrix of this object, may be null if there is no transformation necessary
494 wxGraphicsMatrix* GetMatrix() { return m_matrix; }
495
496 private :
497 wxGraphicsMatrix* m_matrix;
498 wxGraphicsPath* m_path;
499
500 DECLARE_DYNAMIC_CLASS(wxGraphicsFigure)
501 } ;
502
503 #endif
504
505 //
506 // The graphics renderer is the instance corresponding to the rendering engine used, eg there is ONE core graphics renderer
507 // instance on OSX. This instance is pointed back to by all objects created by it. Therefore you can create eg additional
508 // paths at any point from a given matrix etc.
509 //
510
511 class WXDLLIMPEXP_CORE wxGraphicsRenderer : public wxObject
512 {
513 public :
514 wxGraphicsRenderer() {}
515
516 virtual ~wxGraphicsRenderer() {}
517
518 static wxGraphicsRenderer* GetDefaultRenderer();
519
520 // Context
521
522 virtual wxGraphicsContext * CreateContext( const wxWindowDC& dc) = 0 ;
523 virtual wxGraphicsContext * CreateContext( const wxMemoryDC& dc) = 0 ;
524
525 virtual wxGraphicsContext * CreateContextFromNativeContext( void * context ) = 0;
526
527 virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window ) = 0;
528
529 virtual wxGraphicsContext * CreateContext( wxWindow* window ) = 0;
530
531 // create a context that can be used for measuring texts only, no drawing allowed
532 virtual wxGraphicsContext * CreateMeasuringContext() = 0;
533
534 // Path
535
536 virtual wxGraphicsPath CreatePath() = 0;
537
538 // Matrix
539
540 virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
541 wxDouble tx=0.0, wxDouble ty=0.0) = 0;
542
543 // Paints
544
545 virtual wxGraphicsPen CreatePen(const wxPen& pen) = 0 ;
546
547 virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) = 0 ;
548
549 // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
550 virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
551 const wxColour&c1, const wxColour&c2) = 0;
552
553 // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
554 // with radius r and color cColor
555 virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
556 const wxColour &oColor, const wxColour &cColor) = 0;
557
558 // sets the font
559 virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) = 0;
560
561 private :
562 DECLARE_NO_COPY_CLASS(wxGraphicsRenderer)
563 DECLARE_ABSTRACT_CLASS(wxGraphicsRenderer)
564 } ;
565
566 #endif
567
568 #endif // _WX_GRAPHICS_H_