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