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/geometry.h"
  16 #include "wx/dynarray.h"
  17
  18 class WXDLLEXPORT wxWindowDC;
  19
  20 #if wxUSE_GRAPHICS_CONTEXT
  21
  22 /*
  23  * notes about the graphics context apis
  24  *
  25  * angles : are measured in radians, 0.0 being in direction of positiv x axis, PI/2 being
  26  * in direction of positive y axis.
  27  */
  28
  29 class WXDLLEXPORT wxGraphicsPath
  30 {
  31 public :
  32     wxGraphicsPath() {}
  33     virtual ~wxGraphicsPath() {}
  34
  35     //
  36     // These are the path primitives from which everything else can be constructed
  37     //
  38
  39     // begins a new subpath at (x,y)
  40     virtual void MoveToPoint( wxDouble x, wxDouble y ) = 0;
  41
  42     // adds a straight line from the current point to (x,y)
  43     virtual void AddLineToPoint( wxDouble x, wxDouble y ) = 0;
  44
  45     // adds a cubic Bezier curve from the current point, using two control points and an end point
  46     virtual void AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y ) = 0;
  47
  48     // closes the current sub-path
  49     virtual void CloseSubpath() = 0;
  50
  51     // gets the last point of the current path, (0,0) if not yet set
  52     virtual void GetCurrentPoint( wxDouble& x, wxDouble&y) = 0;
  53
  54     // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
  55     virtual void AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise ) = 0;
  56
  57     //
  58     // These are convenience functions which - if not available natively will be assembled
  59     // using the primitives from above
  60     //
  61
  62     // adds a quadratic Bezier curve from the current point, using a control point and an end point
  63     virtual void AddQuadCurveToPoint( wxDouble cx, wxDouble cy, wxDouble x, wxDouble y );
  64
  65     // appends a rectangle as a new closed subpath
  66     virtual void AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h );
  67
  68     // appends an ellipsis as a new closed subpath fitting the passed rectangle
  69     virtual void AddCircle( wxDouble x, wxDouble y, wxDouble r );
  70
  71     // draws 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)
  72     virtual void AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r ) ;
  73
  74     // wrappers using wxPoint2DDoubles
  75
  76     wxPoint2DDouble GetCurrentPoint();
  77
  78     void MoveToPoint( const wxPoint2DDouble& p);
  79
  80     void AddLineToPoint( const wxPoint2DDouble& p);
  81
  82     void AddCurveToPoint( const wxPoint2DDouble& c1, const wxPoint2DDouble& c2, const wxPoint2DDouble& e);
  83
  84     void AddArc( const wxPoint2DDouble& c, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise);
  85
  86     DECLARE_NO_COPY_CLASS(wxGraphicsPath)
  87 };
  88
  89 /*
  90 class WXDLLEXPORT wxGraphicsMatrix
  91 {
  92 public :
  93         wxGraphicsMatrix() {}
  94
  95         virtual ~wxGraphicsMatrix() {}
  96
  97         wxGraphicsMatrix* Concat( const wxGraphicsMatrix *t ) const;
  98
  99         // returns the inverse matrix
 100         wxGraphicsMatrix* Invert() const;
 101
 102         // returns true if the elements of the transformation matrix are equal ?
 103     bool operator==(const wxGraphicsMatrix& t) const;
 104
 105         // return true if this is the identity matrix
 106         bool IsIdentity();
 107
 108     //
 109     // transformation
 110     //
 111
 112     // translate
 113     virtual void Translate( wxDouble dx , wxDouble dy ) = 0;
 114
 115     // scale
 116     virtual void Scale( wxDouble xScale , wxDouble yScale ) = 0;
 117
 118     // rotate (radians)
 119     virtual void Rotate( wxDouble angle ) = 0;
 120 } ;
 121 */
 122
 123 class WXDLLEXPORT wxGraphicsContext
 124 {
 125 public:
 126     wxGraphicsContext() {}
 127
 128     virtual ~wxGraphicsContext() {}
 129
 130     static wxGraphicsContext* Create( const wxWindowDC& dc) ;
 131
 132     static wxGraphicsContext* CreateFromNative( void * native ) ;
 133
 134     static wxGraphicsContext* Create( wxWindow* window ) ;
 135
 136     // creates a path instance that corresponds to the type of graphics context, ie GDIPlus, cairo, CoreGraphics ...
 137     virtual wxGraphicsPath * CreatePath() = 0;
 138
 139         /*
 140         // create a 'native' matrix corresponding to these values
 141         virtual wxGraphicsMatrix* CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 142                 wxDouble tx=0.0, wxDouble ty=0.0) = 0;
 143         */
 144
 145     // push the current state of the context, ie the transformation matrix on a stack
 146     virtual void PushState() = 0;
 147
 148     // pops a stored state from the stack
 149     virtual void PopState() = 0;
 150
 151     // clips drawings to the region, combined to current clipping region
 152     virtual void Clip( const wxRegion &region ) = 0;
 153
 154     // clips drawings to the rect
 155     virtual void Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 156
 157         // resets the clipping to original extent
 158         virtual void ResetClip() = 0 ;
 159
 160         // returns the native context
 161         virtual void * GetNativeContext() = 0;
 162
 163     //
 164     // transformation : changes the current transformation matrix CTM of the context
 165     //
 166
 167     // translate
 168     virtual void Translate( wxDouble dx , wxDouble dy ) = 0;
 169
 170     // scale
 171     virtual void Scale( wxDouble xScale , wxDouble yScale ) = 0;
 172
 173     // rotate (radians)
 174     virtual void Rotate( wxDouble angle ) = 0;
 175
 176     //
 177     // setting the paint
 178     //
 179
 180     // sets the pan
 181     virtual void SetPen( const wxPen &pen ) = 0;
 182
 183     // sets the brush for filling
 184     virtual void SetBrush( const wxBrush &brush ) = 0;
 185
 186     // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
 187     virtual void SetLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 188         const wxColour&c1, const wxColour&c2) = 0;
 189
 190     // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
 191     // with radius r and color cColor
 192     virtual void SetRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 193         const wxColour &oColor, const wxColour &cColor) = 0;
 194
 195     // sets the font
 196     virtual void SetFont( const wxFont &font ) = 0;
 197
 198     // sets the text color
 199     virtual void SetTextColor( const wxColour &col ) = 0;
 200
 201     // strokes along a path with the current pen
 202     virtual void StrokePath( const wxGraphicsPath *path ) = 0;
 203
 204     // fills a path with the current brush
 205     virtual void FillPath( const wxGraphicsPath *path, int fillStyle = wxWINDING_RULE ) = 0;
 206
 207     // draws a path by first filling and then stroking
 208     virtual void DrawPath( const wxGraphicsPath *path, int fillStyle = wxWINDING_RULE );
 209
 210     //
 211     // text
 212     //
 213
 214     virtual void DrawText( const wxString &str, wxDouble x, wxDouble y ) = 0;
 215
 216     virtual void DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle );
 217
 218     virtual void GetTextExtent( const wxString &text, wxDouble *width, wxDouble *height,
 219         wxDouble *descent, wxDouble *externalLeading ) const  = 0;
 220
 221     virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const = 0;
 222
 223     //
 224     // image support
 225     //
 226
 227     virtual void DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 228
 229     virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0;
 230
 231     //
 232     // convenience methods
 233     //
 234
 235     // strokes a single line
 236     virtual void StrokeLine( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2);
 237
 238     // stroke lines connecting each of the points
 239     virtual void StrokeLines( size_t n, const wxPoint2DDouble *points);
 240
 241     // stroke disconnected lines from begin to end points
 242     virtual void StrokeLines( size_t n, const wxPoint2DDouble *beginPoints, const wxPoint2DDouble *endPoints);
 243
 244     // draws a polygon
 245     virtual void DrawLines( size_t n, const wxPoint2DDouble *points, int fillStyle = wxWINDING_RULE );
 246
 247     // draws a polygon
 248     virtual void DrawRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
 249
 250     // draws an ellipse
 251     virtual void DrawEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
 252
 253     // draws a rounded rectangle
 254     virtual void DrawRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius);
 255
 256      // wrappers using wxPoint2DDouble TODO
 257
 258     DECLARE_NO_COPY_CLASS(wxGraphicsContext)
 259 };
 260
 261 #ifdef __WXMAC__
 262 #define wxGCDC wxDC
 263 #endif
 264
 265 class WXDLLEXPORT wxGCDC:
 266 #ifdef __WXMAC__
 267         public wxDCBase
 268 #else
 269         public wxDC
 270 #endif
 271 {
 272     DECLARE_DYNAMIC_CLASS(wxGCDC)
 273     DECLARE_NO_COPY_CLASS(wxGCDC)
 274
 275 public:
 276     wxGCDC(const wxWindowDC& dc);
 277     wxGCDC();
 278     virtual ~wxGCDC();
 279
 280     void Init();
 281
 282
 283     // implement base class pure virtuals
 284     // ----------------------------------
 285
 286     virtual void Clear();
 287
 288     virtual bool StartDoc( const wxString& WXUNUSED(message) ) { return true; }
 289     virtual void EndDoc(void) {}
 290
 291     virtual void StartPage(void) {}
 292     virtual void EndPage(void) {}
 293
 294     virtual void SetFont(const wxFont& font);
 295     virtual void SetPen(const wxPen& pen);
 296     virtual void SetBrush(const wxBrush& brush);
 297     virtual void SetBackground(const wxBrush& brush);
 298     virtual void SetBackgroundMode(int mode);
 299     virtual void SetPalette(const wxPalette& palette);
 300
 301     virtual void DestroyClippingRegion();
 302
 303     virtual wxCoord GetCharHeight() const;
 304     virtual wxCoord GetCharWidth() const;
 305
 306     virtual bool CanDrawBitmap() const;
 307     virtual bool CanGetTextExtent() const;
 308     virtual int GetDepth() const;
 309     virtual wxSize GetPPI() const;
 310
 311     virtual void SetMapMode(int mode);
 312     virtual void SetUserScale(double x, double y);
 313
 314     virtual void SetLogicalScale(double x, double y);
 315     virtual void SetLogicalOrigin(wxCoord x, wxCoord y);
 316     virtual void SetDeviceOrigin(wxCoord x, wxCoord y);
 317     virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp);
 318     virtual void SetLogicalFunction(int function);
 319
 320     virtual void SetTextForeground(const wxColour& colour);
 321     virtual void SetTextBackground(const wxColour& colour);
 322
 323     virtual void ComputeScaleAndOrigin();
 324
 325     wxGraphicsContext* GetGraphicContext() { return m_graphicContext; }
 326         virtual void SetGraphicsContext( wxGraphicsContext* ctx )
 327                 { delete m_graphicContext; m_graphicContext = ctx; }
 328 protected:
 329     // the true implementations
 330     virtual bool DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
 331         int style = wxFLOOD_SURFACE);
 332
 333     virtual void DoGradientFillLinear(const wxRect& rect,
 334         const wxColour& initialColour,
 335         const wxColour& destColour,
 336         wxDirection nDirection = wxEAST);
 337
 338     virtual void DoGradientFillConcentric(const wxRect& rect,
 339         const wxColour& initialColour,
 340         const wxColour& destColour,
 341         const wxPoint& circleCenter);
 342
 343     virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const;
 344
 345     virtual void DoDrawPoint(wxCoord x, wxCoord y);
 346
 347 #if wxUSE_SPLINES
 348     virtual void DoDrawSpline(wxList *points);
 349 #endif
 350
 351     virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2);
 352
 353     virtual void DoDrawArc(wxCoord x1, wxCoord y1,
 354         wxCoord x2, wxCoord y2,
 355         wxCoord xc, wxCoord yc);
 356
 357     virtual void DoDrawCheckMark(wxCoord x, wxCoord y,
 358         wxCoord width, wxCoord height);
 359
 360     virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 361         double sa, double ea);
 362
 363     virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
 364     virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 365         wxCoord width, wxCoord height,
 366         double radius);
 367     virtual void DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
 368
 369     virtual void DoCrossHair(wxCoord x, wxCoord y);
 370
 371     virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y);
 372     virtual void DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 373         bool useMask = false);
 374
 375     virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y);
 376     virtual void DoDrawRotatedText(const wxString& text, wxCoord x, wxCoord y,
 377         double angle);
 378
 379     virtual bool DoBlit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 380         wxDC *source, wxCoord xsrc, wxCoord ysrc,
 381         int rop = wxCOPY, bool useMask = false, wxCoord xsrcMask = -1, wxCoord ysrcMask = -1);
 382
 383     virtual void DoGetSize(int *,int *) const;
 384     virtual void DoGetSizeMM(int* width, int* height) const;
 385
 386     virtual void DoDrawLines(int n, wxPoint points[],
 387         wxCoord xoffset, wxCoord yoffset);
 388     virtual void DoDrawPolygon(int n, wxPoint points[],
 389         wxCoord xoffset, wxCoord yoffset,
 390         int fillStyle = wxODDEVEN_RULE);
 391     virtual void DoDrawPolyPolygon(int n, int count[], wxPoint points[],
 392         wxCoord xoffset, wxCoord yoffset,
 393         int fillStyle);
 394
 395     virtual void DoSetClippingRegionAsRegion(const wxRegion& region);
 396     virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
 397         wxCoord width, wxCoord height);
 398
 399     virtual void DoGetTextExtent(const wxString& string,
 400         wxCoord *x, wxCoord *y,
 401         wxCoord *descent = NULL,
 402         wxCoord *externalLeading = NULL,
 403         wxFont *theFont = NULL) const;
 404
 405     virtual bool DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const;
 406
 407 protected:
 408     // scaling variables
 409     double       m_mm_to_pix_x, m_mm_to_pix_y;
 410
 411         double m_formerScaleX, m_formerScaleY;
 412
 413     wxGraphicsContext* m_graphicContext;
 414 };
 415
 416 #endif
 417
 418 #endif
 419     // _WX_GRID_H_BASE_