include/wx/dc.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dc.h
   3 // Purpose:     wxDC class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     05/25/99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWindows team
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_DC_H_BASE_
  13 #define _WX_DC_H_BASE_
  14
  15 #ifdef __GNUG__
  16     #pragma interface "dcbase.h"
  17 #endif
  18
  19 // ----------------------------------------------------------------------------
  20 // headers which we must include here
  21 // ----------------------------------------------------------------------------
  22
  23 #include "wx/object.h"          // the base class
  24
  25 #include "wx/cursor.h"          // we have member variables of these classes
  26 #include "wx/font.h"            // so we can't do without them
  27 #include "wx/colour.h"
  28 #include "wx/brush.h"
  29 #include "wx/pen.h"
  30 #include "wx/palette.h"
  31
  32 #include "wx/list.h"            // we use wxList in inline functions
  33
  34 // ---------------------------------------------------------------------------
  35 // global variables
  36 // ---------------------------------------------------------------------------
  37
  38 WXDLLEXPORT_DATA(extern int) wxPageNumber;
  39
  40 // ---------------------------------------------------------------------------
  41 // wxDC is the device context - object on which any drawing is done
  42 // ---------------------------------------------------------------------------
  43
  44 class WXDLLEXPORT wxDCBase : public wxObject
  45 {
  46 public:
  47     wxDCBase()
  48     {
  49         m_clipping = FALSE;
  50         m_ok = TRUE;
  51
  52         m_minX = m_minY = m_maxX = m_maxY = 0;
  53
  54         m_signX = m_signY = 1;
  55
  56         m_logicalOriginX = m_logicalOriginY =
  57         m_deviceOriginX = m_deviceOriginY = 0;
  58
  59         m_logicalScaleX = m_logicalScaleY =
  60         m_userScaleX = m_userScaleY =
  61         m_scaleX = m_scaleY = 1.0;
  62
  63         m_logicalFunction = wxCOPY;
  64
  65         m_backgroundMode = wxTRANSPARENT;
  66
  67         m_mappingMode = wxMM_TEXT;
  68
  69         m_backgroundBrush = *wxTRANSPARENT_BRUSH;
  70
  71         m_textForegroundColour = *wxBLACK;
  72         m_textBackgroundColour = *wxWHITE;
  73
  74         m_colour = wxColourDisplay();
  75     }
  76
  77     ~wxDCBase() { }
  78
  79     virtual void BeginDrawing() { }
  80     virtual void EndDrawing() { }
  81
  82     // graphic primitives
  83     // ------------------
  84
  85     void FloodFill(wxCoord x, wxCoord y, const wxColour& col,
  86                    int style = wxFLOOD_SURFACE)
  87         { DoFloodFill(x, y, col, style); }
  88     void FloodFill(const wxPoint& pt, const wxColour& col,
  89                    int style = wxFLOOD_SURFACE)
  90         { DoFloodFill(pt.x, pt.y, col, style); }
  91
  92     bool GetPixel(wxCoord x, wxCoord y, wxColour *col) const
  93         { return DoGetPixel(x, y, col); }
  94     bool GetPixel(const wxPoint& pt, wxColour *col) const
  95         { return DoGetPixel(pt.x, pt.y, col); }
  96
  97     void DrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
  98         { DoDrawLine(x1, y1, x2, y2); }
  99     void DrawLine(const wxPoint& pt1, const wxPoint& pt2)
 100         { DoDrawLine(pt1.x, pt1.y, pt2.x, pt2.y); }
 101
 102     void CrossHair(wxCoord x, wxCoord y)
 103         { DoCrossHair(x, y); }
 104     void CrossHair(const wxPoint& pt)
 105         { DoCrossHair(pt.x, pt.y); }
 106
 107     void DrawArc(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2,
 108                  wxCoord xc, wxCoord yc)
 109         { DoDrawArc(x1, y1, x2, y2, xc, yc); }
 110     void DrawArc(const wxPoint& pt1, const wxPoint& pt2, const wxPoint& centre)
 111         { DoDrawArc(pt1.x, pt1.y, pt2.x, pt2.y, centre.x, centre.y); }
 112
 113     void DrawCheckMark(wxCoord x, wxCoord y,
 114                        wxCoord width, wxCoord height)
 115         { DoDrawCheckMark(x, y, width, height); }
 116     void DrawCheckMark(const wxRect& rect)
 117         { DoDrawCheckMark(rect.x, rect.y, rect.width, rect.height); }
 118
 119     void DrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 120                          double sa, double ea)
 121         { DoDrawEllipticArc(x, y, w, h, sa, ea); }
 122     void DrawEllipticArc(const wxPoint& pt, const wxSize& sz,
 123                          double sa, double ea)
 124         { DoDrawEllipticArc(pt.x, pt.y, sz.x, sz.y, sa, ea); }
 125
 126     void DrawPoint(wxCoord x, wxCoord y)
 127         { DoDrawPoint(x, y); }
 128     void DrawPoint(const wxPoint& pt)
 129         { DoDrawPoint(pt.x, pt.y); }
 130
 131     void DrawLines(int n, wxPoint points[],
 132                    wxCoord xoffset = 0, wxCoord yoffset = 0)
 133         { DoDrawLines(n, points, xoffset, yoffset); }
 134     void DrawLines(const wxList *list,
 135                    wxCoord xoffset = 0, wxCoord yoffset = 0);
 136
 137     void DrawPolygon(int n, wxPoint points[],
 138                      wxCoord xoffset = 0, wxCoord yoffset = 0,
 139                      int fillStyle = wxODDEVEN_RULE)
 140         { DoDrawPolygon(n, points, xoffset, yoffset, fillStyle); }
 141
 142     void DrawPolygon(const wxList *list,
 143                      wxCoord xoffset = 0, wxCoord yoffset = 0,
 144                      int fillStyle = wxODDEVEN_RULE);
 145
 146     void DrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 147         { DoDrawRectangle(x, y, width, height); }
 148     void DrawRectangle(const wxPoint& pt, const wxSize& sz)
 149         { DoDrawRectangle(pt.x, pt.y, sz.x, sz.y); }
 150     void DrawRectangle(const wxRect& rect)
 151         { DoDrawRectangle(rect.x, rect.y, rect.width, rect.height); }
 152
 153     void DrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height,
 154                               double radius)
 155         { DoDrawRoundedRectangle(x, y, width, height, radius); }
 156     void DrawRoundedRectangle(const wxPoint& pt, const wxSize& sz,
 157                              double radius)
 158         { DoDrawRoundedRectangle(pt.x, pt.y, sz.x, sz.y, radius); }
 159     void DrawRoundedRectangle(const wxRect& r, double radius)
 160         { DoDrawRoundedRectangle(r.x, r.y, r.width, r.height, radius); }
 161
 162     void DrawCircle(wxCoord x, wxCoord y, wxCoord radius)
 163         { DoDrawEllipse(x - radius, y - radius, 2*radius, 2*radius); }
 164     void DrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 165         { DoDrawEllipse(x, y, width, height); }
 166     void DrawEllipse(const wxPoint& pt, const wxSize& sz)
 167         { DoDrawEllipse(pt.x, pt.y, sz.x, sz.y); }
 168     void DrawEllipse(const wxRect& rect)
 169         { DoDrawEllipse(rect.x, rect.y, rect.width, rect.height); }
 170
 171     void DrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 172         { DoDrawIcon(icon, x, y); }
 173     void DrawIcon(const wxIcon& icon, const wxPoint& pt)
 174         { DoDrawIcon(icon, pt.x, pt.y); }
 175
 176     void DrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 177                     bool useMask = FALSE)
 178         { DoDrawBitmap(bmp, x, y, useMask); }
 179     void DrawBitmap(const wxBitmap &bmp, const wxPoint& pt,
 180                     bool useMask = FALSE)
 181         { DoDrawBitmap(bmp, pt.x, pt.y, useMask); }
 182
 183     void DrawText(const wxString& text, wxCoord x, wxCoord y)
 184         { DoDrawText(text, x, y); }
 185     void DrawText(const wxString& text, const wxPoint& pt)
 186         { DoDrawText(text, pt.x, pt.y); }
 187
 188     void DrawRotatedText(const wxString& text, wxCoord x, wxCoord y, double angle)
 189         { DoDrawRotatedText(text, x, y, angle); }
 190     void DrawRotatedText(const wxString& text, const wxPoint& pt, double angle)
 191         { DoDrawRotatedText(text, pt.x, pt.y, angle); }
 192
 193     bool Blit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 194               wxDC *source, wxCoord xsrc, wxCoord ysrc,
 195               int rop = wxCOPY, bool useMask = FALSE)
 196     {
 197         return DoBlit(xdest, ydest, width, height,
 198                       source, xsrc, ysrc, rop, useMask);
 199     }
 200     bool Blit(const wxPoint& destPt, const wxSize& sz,
 201               wxDC *source, const wxPoint& srcPt,
 202               int rop = wxCOPY, bool useMask = FALSE)
 203     {
 204         return DoBlit(destPt.x, destPt.y, sz.x, sz.y,
 205                       source, srcPt.x, srcPt.y, rop, useMask);
 206     }
 207
 208 #if wxUSE_SPLINES
 209     // TODO: this API needs fixing (wxPointList, why (!const) "wxList *"?)
 210     void DrawSpline(wxCoord x1, wxCoord y1,
 211                     wxCoord x2, wxCoord y2,
 212                     wxCoord x3, wxCoord y3);
 213     void DrawSpline(int n, wxPoint points[]);
 214
 215     void DrawSpline(wxList *points) { DoDrawSpline(points); }
 216 #endif // wxUSE_SPLINES
 217
 218     // global DC operations
 219     // --------------------
 220
 221     virtual void Clear() = 0;
 222
 223     virtual bool StartDoc(const wxString& WXUNUSED(message)) { return TRUE; }
 224     virtual void EndDoc() { }
 225
 226     virtual void StartPage() { }
 227     virtual void EndPage() { }
 228
 229     // set objects to use for drawing
 230     // ------------------------------
 231
 232     virtual void SetFont(const wxFont& font) = 0;
 233     virtual void SetPen(const wxPen& pen) = 0;
 234     virtual void SetBrush(const wxBrush& brush) = 0;
 235     virtual void SetBackground(const wxBrush& brush) = 0;
 236     virtual void SetBackgroundMode(int mode) = 0;
 237     virtual void SetPalette(const wxPalette& palette) = 0;
 238
 239     // clipping region
 240     // ---------------
 241
 242     void SetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 243         { DoSetClippingRegion(x, y, width, height); }
 244     void SetClippingRegion(const wxPoint& pt, const wxSize& sz)
 245         { DoSetClippingRegion(pt.x, pt.y, sz.x, sz.y); }
 246     void SetClippingRegion(const wxRect& rect)
 247         { DoSetClippingRegion(rect.x, rect.y, rect.width, rect.height); }
 248     void SetClippingRegion(const wxRegion& region)
 249         { DoSetClippingRegionAsRegion(region); }
 250
 251     virtual void DestroyClippingRegion() = 0;
 252
 253     void GetClippingBox(wxCoord *x, wxCoord *y, wxCoord *w, wxCoord *h) const
 254         { DoGetClippingBox(x, y, w, h); }
 255     void GetClippingBox(wxRect& rect) const
 256         {
 257           // Necessary to use intermediate variables for 16-bit compilation
 258           wxCoord x, y, w, h;
 259           DoGetClippingBox(&x, &y, &w, &h);
 260           rect.x = x; rect.y = y; rect.width = w; rect.height = h;
 261         }
 262
 263     // text extent
 264     // -----------
 265
 266     virtual wxCoord GetCharHeight() const = 0;
 267     virtual wxCoord GetCharWidth() const = 0;
 268
 269     void GetTextExtent(const wxString& string,
 270                        wxCoord *x, wxCoord *y,
 271                        wxCoord *descent = NULL,
 272                        wxCoord *externalLeading = NULL,
 273                        wxFont *theFont = NULL) const
 274         { DoGetTextExtent(string, x, y, descent, externalLeading, theFont); }
 275
 276     // size and resolution
 277     // -------------------
 278
 279     // in device units
 280     void GetSize(int *width, int *height) const
 281         { DoGetSize(width, height); }
 282     wxSize GetSize() const
 283     {
 284         int w, h;
 285         DoGetSize(&w, &h);
 286
 287         return wxSize(w, h);
 288     }
 289
 290     // in mm
 291     void GetSizeMM(int* width, int* height) const
 292         { DoGetSizeMM(width, height); }
 293     wxSize GetSizeMM() const
 294     {
 295         int w, h;
 296         DoGetSizeMM(&w, &h);
 297
 298         return wxSize(w, h);
 299     }
 300
 301     // coordinates conversions
 302     // -----------------------
 303
 304     // This group of functions does actual conversion of the input, as you'd
 305     // expect.
 306     wxCoord DeviceToLogicalX(wxCoord x) const;
 307     wxCoord DeviceToLogicalY(wxCoord y) const;
 308     wxCoord DeviceToLogicalXRel(wxCoord x) const;
 309     wxCoord DeviceToLogicalYRel(wxCoord y) const;
 310     wxCoord LogicalToDeviceX(wxCoord x) const;
 311     wxCoord LogicalToDeviceY(wxCoord y) const;
 312     wxCoord LogicalToDeviceXRel(wxCoord x) const;
 313     wxCoord LogicalToDeviceYRel(wxCoord y) const;
 314
 315     // query DC capabilities
 316     // ---------------------
 317
 318     virtual bool CanDrawBitmap() const = 0;
 319     virtual bool CanGetTextExtent() const = 0;
 320
 321     // colour depth
 322     virtual int GetDepth() const = 0;
 323
 324     // Resolution in Pixels per inch
 325     virtual wxSize GetPPI() const = 0;
 326
 327     virtual bool Ok() const { return m_ok; }
 328
 329     // accessors
 330     // ---------
 331
 332         // const...
 333     const wxBrush&  GetBackground() const { return m_backgroundBrush; }
 334     const wxBrush&  GetBrush() const { return m_brush; }
 335     const wxFont&   GetFont() const { return m_font; }
 336     const wxPen&    GetPen() const { return m_pen; }
 337     const wxColour& GetTextBackground() const { return m_textBackgroundColour; }
 338     const wxColour& GetTextForeground() const { return m_textForegroundColour; }
 339
 340         // ... and non const
 341     wxBrush&  GetBackground() { return m_backgroundBrush; }
 342     wxBrush&  GetBrush() { return m_brush; }
 343     wxFont&   GetFont() { return m_font; }
 344     wxPen&    GetPen() { return m_pen; }
 345     wxColour& GetTextBackground() { return m_textBackgroundColour; }
 346     wxColour& GetTextForeground() { return m_textForegroundColour; }
 347
 348     virtual void SetTextForeground(const wxColour& colour)
 349         { m_textForegroundColour = colour; }
 350     virtual void SetTextBackground(const wxColour& colour)
 351         { m_textBackgroundColour = colour; }
 352
 353     int GetMapMode() const { return m_mappingMode; }
 354     virtual void SetMapMode(int mode) = 0;
 355
 356     virtual void GetUserScale(double *x, double *y) const
 357     {
 358         if ( x ) *x = m_userScaleX;
 359         if ( y ) *y = m_userScaleY;
 360     }
 361     virtual void SetUserScale(double x, double y) = 0;
 362
 363     virtual void GetLogicalScale(double *x, double *y)
 364     {
 365         if ( x ) *x = m_logicalScaleX;
 366         if ( y ) *y = m_logicalScaleY;
 367     }
 368     virtual void SetLogicalScale(double x, double y)
 369     {
 370         m_logicalScaleX = x;
 371         m_logicalScaleY = y;
 372     }
 373
 374     void GetLogicalOrigin(wxCoord *x, wxCoord *y) const
 375         { DoGetLogicalOrigin(x, y); }
 376     wxPoint GetLogicalOrigin() const
 377         { wxCoord x, y; DoGetLogicalOrigin(&x, &y); return wxPoint(x, y); }
 378     virtual void SetLogicalOrigin(wxCoord x, wxCoord y) = 0;
 379
 380     void GetDeviceOrigin(wxCoord *x, wxCoord *y) const
 381         { DoGetDeviceOrigin(x, y); }
 382     wxPoint GetDeviceOrigin() const
 383         { wxCoord x, y; DoGetDeviceOrigin(&x, &y); return wxPoint(x, y); }
 384     virtual void SetDeviceOrigin(wxCoord x, wxCoord y) = 0;
 385
 386     virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp) = 0;
 387
 388     int GetLogicalFunction() const { return m_logicalFunction; }
 389     virtual void SetLogicalFunction(int function) = 0;
 390
 391     // Sometimes we need to override optimization, e.g. if other software is
 392     // drawing onto our surface and we can't be sure of who's done what.
 393     //
 394     // FIXME: is this (still) used?
 395     virtual void SetOptimization(bool WXUNUSED(opt)) { }
 396     virtual bool GetOptimization() { return FALSE; }
 397
 398     // bounding box
 399     // ------------
 400
 401     virtual void CalcBoundingBox(wxCoord x, wxCoord y)
 402     {
 403         if ( x < m_minX ) m_minX = x;
 404         if ( y < m_minY ) m_minY = y;
 405         if ( x > m_maxX ) m_maxX = x;
 406         if ( y > m_maxY ) m_maxY = y;
 407     }
 408
 409     // Get the final bounding box of the PostScript or Metafile picture.
 410     wxCoord MinX() const { return m_minX; }
 411     wxCoord MaxX() const { return m_maxX; }
 412     wxCoord MinY() const { return m_minY; }
 413     wxCoord MaxY() const { return m_maxY; }
 414
 415     // misc old functions
 416     // ------------------
 417
 418     // for compatibility with the old code when wxCoord was long everywhere
 419 #ifndef __WIN16__
 420     void GetTextExtent(const wxString& string,
 421                        long *x, long *y,
 422                        long *descent = NULL,
 423                        long *externalLeading = NULL,
 424                        wxFont *theFont = NULL) const
 425     {
 426         wxCoord x2, y2, descent2, externalLeading2;
 427         DoGetTextExtent(string, &x2, &y2,
 428                         &descent2, &externalLeading2,
 429                         theFont);
 430         if ( x )
 431             *x = x2;
 432         if ( y )
 433             *y = y2;
 434         if ( descent )
 435             *descent = descent2;
 436         if ( externalLeading )
 437             *externalLeading = externalLeading2;
 438     }
 439
 440     void GetLogicalOrigin(long *x, long *y) const
 441     {
 442         wxCoord x2, y2;
 443         DoGetLogicalOrigin(&x2, &y2);
 444         if ( x )
 445             *x = x2;
 446         if ( y )
 447             *y = y2;
 448     }
 449
 450     void GetDeviceOrigin(long *x, long *y) const
 451     {
 452         wxCoord x2, y2;
 453         DoGetDeviceOrigin(&x2, &y2);
 454         if ( x )
 455             *x = x2;
 456         if ( y )
 457             *y = y2;
 458     }
 459     void GetClippingBox(long *x, long *y, long *w, long *h) const
 460     {
 461         wxCoord xx,yy,ww,hh;
 462         DoGetClippingBox(&xx, &yy, &ww, &hh);
 463         if (x) *x = xx;
 464         if (y) *y = yy;
 465         if (w) *w = ww;
 466         if (h) *h = hh;
 467     }
 468 #endif // !Win16
 469
 470 #if WXWIN_COMPATIBILITY
 471     virtual void SetColourMap(const wxPalette& palette) { SetPalette(palette); }
 472     void GetTextExtent(const wxString& string, float *x, float *y,
 473             float *descent = NULL, float *externalLeading = NULL,
 474             wxFont *theFont = NULL, bool use16bit = FALSE) const ;
 475     void GetSize(float* width, float* height) const { int w, h; GetSize(& w, & h); *width = w; *height = h; }
 476     void GetSizeMM(float *width, float *height) const { long w, h; GetSizeMM(& w, & h); *width = (float) w; *height = (float) h; }
 477 #endif // WXWIN_COMPATIBILITY
 478
 479 protected:
 480     // the pure virtual functions which should be implemented by wxDC
 481     virtual void DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
 482                              int style = wxFLOOD_SURFACE) = 0;
 483
 484     virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const = 0;
 485
 486     virtual void DoDrawPoint(wxCoord x, wxCoord y) = 0;
 487     virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2) = 0;
 488
 489     virtual void DoDrawArc(wxCoord x1, wxCoord y1,
 490                            wxCoord x2, wxCoord y2,
 491                            wxCoord xc, wxCoord yc) = 0;
 492     virtual void DoDrawCheckMark(wxCoord x, wxCoord y,
 493                                  wxCoord width, wxCoord height);
 494     virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 495                                    double sa, double ea) = 0;
 496
 497     virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height) = 0;
 498     virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 499                                         wxCoord width, wxCoord height,
 500                                         double radius) = 0;
 501     virtual void DoDrawEllipse(wxCoord x, wxCoord y,
 502                                wxCoord width, wxCoord height) = 0;
 503
 504     virtual void DoCrossHair(wxCoord x, wxCoord y) = 0;
 505
 506     virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y) = 0;
 507     virtual void DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 508                               bool useMask = FALSE) = 0;
 509
 510     virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y) = 0;
 511     virtual void DoDrawRotatedText(const wxString& text,
 512                                    wxCoord x, wxCoord y, double angle) = 0;
 513
 514     virtual bool DoBlit(wxCoord xdest, wxCoord ydest,
 515                         wxCoord width, wxCoord height,
 516                         wxDC *source, wxCoord xsrc, wxCoord ysrc,
 517                         int rop = wxCOPY, bool useMask = FALSE) = 0;
 518
 519     virtual void DoGetSize(int *width, int *height) const = 0;
 520     virtual void DoGetSizeMM(int* width, int* height) const = 0;
 521
 522     virtual void DoDrawLines(int n, wxPoint points[],
 523                              wxCoord xoffset, wxCoord yoffset) = 0;
 524     virtual void DoDrawPolygon(int n, wxPoint points[],
 525                                wxCoord xoffset, wxCoord yoffset,
 526                                int fillStyle = wxODDEVEN_RULE) = 0;
 527
 528     virtual void DoSetClippingRegionAsRegion(const wxRegion& region) = 0;
 529     virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
 530                                      wxCoord width, wxCoord height) = 0;
 531
 532     // FIXME are these functions really different?
 533     virtual void DoGetClippingRegion(wxCoord *x, wxCoord *y,
 534                                      wxCoord *w, wxCoord *h)
 535         { DoGetClippingBox(x, y, w, h); }
 536     virtual void DoGetClippingBox(wxCoord *x, wxCoord *y,
 537                                   wxCoord *w, wxCoord *h) const
 538     {
 539         if ( m_clipping )
 540         {
 541             if ( x ) *x = m_clipX1;
 542             if ( y ) *y = m_clipY1;
 543             if ( w ) *w = m_clipX2 - m_clipX1;
 544             if ( h ) *h = m_clipY2 - m_clipY1;
 545         }
 546         else
 547         {
 548             *x = *y = *w = *h = 0;
 549         }
 550     }
 551
 552     virtual void DoGetLogicalOrigin(wxCoord *x, wxCoord *y) const
 553     {
 554         if ( x ) *x = m_logicalOriginX;
 555         if ( y ) *y = m_logicalOriginY;
 556     }
 557
 558     virtual void DoGetDeviceOrigin(wxCoord *x, wxCoord *y) const
 559     {
 560         if ( x ) *x = m_deviceOriginX;
 561         if ( y ) *y = m_deviceOriginY;
 562     }
 563
 564     virtual void DoGetTextExtent(const wxString& string,
 565                                  wxCoord *x, wxCoord *y,
 566                                  wxCoord *descent = NULL,
 567                                  wxCoord *externalLeading = NULL,
 568                                  wxFont *theFont = NULL) const = 0;
 569
 570 #if wxUSE_SPLINES
 571     virtual void DoDrawSpline(wxList *points) = 0;
 572 #endif
 573
 574 protected:
 575     // flags
 576     bool m_colour:1;
 577     bool m_ok:1;
 578     bool m_clipping:1;
 579     bool m_isInteractive:1;
 580
 581     // coordinate system variables
 582
 583     // TODO short descriptions of what exactly they are would be nice...
 584
 585     wxCoord m_logicalOriginX, m_logicalOriginY;
 586     wxCoord m_deviceOriginX, m_deviceOriginY;
 587
 588     double m_logicalScaleX, m_logicalScaleY;
 589     double m_userScaleX, m_userScaleY;
 590     double m_scaleX, m_scaleY;
 591
 592     // Used by SetAxisOrientation() to invert the axes
 593     int m_signX, m_signY;
 594
 595     // bounding and clipping boxes
 596     wxCoord m_minX, m_minY, m_maxX, m_maxY;
 597     wxCoord m_clipX1, m_clipY1, m_clipX2, m_clipY2;
 598
 599     int m_logicalFunction;
 600     int m_backgroundMode;
 601     int m_mappingMode;
 602
 603     // GDI objects
 604     wxPen             m_pen;
 605     wxBrush           m_brush;
 606     wxBrush           m_backgroundBrush;
 607     wxColour          m_textForegroundColour;
 608     wxColour          m_textBackgroundColour;
 609     wxFont            m_font;
 610     wxPalette         m_palette;
 611
 612 private:
 613     DECLARE_NO_COPY_CLASS(wxDCBase);
 614     DECLARE_ABSTRACT_CLASS(wxDCBase)
 615 };
 616
 617 // ----------------------------------------------------------------------------
 618 // now include the declaration of wxDC class
 619 // ----------------------------------------------------------------------------
 620
 621 #if defined(__WXMSW__)
 622     #include "wx/msw/dc.h"
 623 #elif defined(__WXMOTIF__)
 624     #include "wx/motif/dc.h"
 625 #elif defined(__WXGTK__)
 626     #include "wx/gtk/dc.h"
 627 #elif defined(__WXQT__)
 628     #include "wx/qt/dc.h"
 629 #elif defined(__WXMAC__)
 630     #include "wx/mac/dc.h"
 631 #elif defined(__WXPM__)
 632     #include "wx/os2/dc.h"
 633 #elif defined(__WXSTUBS__)
 634     #include "wx/stubs/dc.h"
 635 #endif
 636
 637 #endif
 638     // _WX_DC_H_BASE_