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 class WXDLLEXPORT wxDCBase;
  35
  36 class WXDLLEXPORT wxDrawObject
  37 {
  38 public:
  39
  40     wxDrawObject()
  41     {
  42         ResetBoundingBox();
  43     }
  44
  45     virtual ~wxDrawObject() { }
  46
  47     virtual void Draw(wxDCBase&) const { }
  48
  49     virtual void CalcBoundingBox(wxCoord x, wxCoord y)
  50     {
  51       if ( m_isBBoxValid )
  52       {
  53          if ( x < m_minX ) m_minX = x;
  54          if ( y < m_minY ) m_minY = y;
  55          if ( x > m_maxX ) m_maxX = x;
  56          if ( y > m_maxY ) m_maxY = y;
  57       }
  58       else
  59       {
  60          m_isBBoxValid = TRUE;
  61
  62          m_minX = x;
  63          m_minY = y;
  64          m_maxX = x;
  65          m_maxY = y;
  66       }
  67     }
  68
  69     void ResetBoundingBox()
  70     {
  71         m_isBBoxValid = FALSE;
  72
  73         m_minX = m_maxX = m_minY = m_maxY = 0;
  74     }
  75
  76     // Get the final bounding box of the PostScript or Metafile picture.
  77
  78     wxCoord MinX() const { return m_minX; }
  79     wxCoord MaxX() const { return m_maxX; }
  80     wxCoord MinY() const { return m_minY; }
  81     wxCoord MaxY() const { return m_maxY; }
  82
  83     //to define the type of object for derived objects
  84     virtual int GetType()=0;
  85
  86 protected:
  87     //for boundingbox calculation
  88     bool m_isBBoxValid:1;
  89     //for boundingbox calculation
  90     wxCoord m_minX, m_minY, m_maxX, m_maxY;
  91 };
  92
  93 // ---------------------------------------------------------------------------
  94 // global variables
  95 // ---------------------------------------------------------------------------
  96
  97 WXDLLEXPORT_DATA(extern int) wxPageNumber;
  98
  99 // ---------------------------------------------------------------------------
 100 // wxDC is the device context - object on which any drawing is done
 101 // ---------------------------------------------------------------------------
 102
 103 class WXDLLEXPORT wxDCBase : public wxObject
 104 {
 105 public:
 106     wxDCBase()
 107     {
 108         m_clipping = FALSE;
 109         m_ok = TRUE;
 110
 111         ResetBoundingBox();
 112
 113         m_signX = m_signY = 1;
 114
 115         m_logicalOriginX = m_logicalOriginY =
 116         m_deviceOriginX = m_deviceOriginY = 0;
 117
 118         m_logicalScaleX = m_logicalScaleY =
 119         m_userScaleX = m_userScaleY =
 120         m_scaleX = m_scaleY = 1.0;
 121
 122         m_logicalFunction = wxCOPY;
 123
 124         m_backgroundMode = wxTRANSPARENT;
 125
 126         m_mappingMode = wxMM_TEXT;
 127
 128         m_backgroundBrush = *wxTRANSPARENT_BRUSH;
 129
 130         m_textForegroundColour = *wxBLACK;
 131         m_textBackgroundColour = *wxWHITE;
 132
 133         m_colour = wxColourDisplay();
 134     }
 135
 136     ~wxDCBase() { }
 137
 138     virtual void BeginDrawing() { }
 139     virtual void EndDrawing() { }
 140
 141     // graphic primitives
 142     // ------------------
 143
 144     virtual void DrawObject(wxDrawObject* drawobject)
 145     {
 146         drawobject->Draw(*this);
 147         CalcBoundingBox(drawobject->MinX(),drawobject->MinY());
 148         CalcBoundingBox(drawobject->MaxX(),drawobject->MaxY());
 149     }
 150
 151     void FloodFill(wxCoord x, wxCoord y, const wxColour& col,
 152                    int style = wxFLOOD_SURFACE)
 153         { DoFloodFill(x, y, col, style); }
 154     void FloodFill(const wxPoint& pt, const wxColour& col,
 155                    int style = wxFLOOD_SURFACE)
 156         { DoFloodFill(pt.x, pt.y, col, style); }
 157
 158     bool GetPixel(wxCoord x, wxCoord y, wxColour *col) const
 159         { return DoGetPixel(x, y, col); }
 160     bool GetPixel(const wxPoint& pt, wxColour *col) const
 161         { return DoGetPixel(pt.x, pt.y, col); }
 162
 163     void DrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
 164         { DoDrawLine(x1, y1, x2, y2); }
 165     void DrawLine(const wxPoint& pt1, const wxPoint& pt2)
 166         { DoDrawLine(pt1.x, pt1.y, pt2.x, pt2.y); }
 167
 168     void CrossHair(wxCoord x, wxCoord y)
 169         { DoCrossHair(x, y); }
 170     void CrossHair(const wxPoint& pt)
 171         { DoCrossHair(pt.x, pt.y); }
 172
 173     void DrawArc(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2,
 174                  wxCoord xc, wxCoord yc)
 175         { DoDrawArc(x1, y1, x2, y2, xc, yc); }
 176     void DrawArc(const wxPoint& pt1, const wxPoint& pt2, const wxPoint& centre)
 177         { DoDrawArc(pt1.x, pt1.y, pt2.x, pt2.y, centre.x, centre.y); }
 178
 179     void DrawCheckMark(wxCoord x, wxCoord y,
 180                        wxCoord width, wxCoord height)
 181         { DoDrawCheckMark(x, y, width, height); }
 182     void DrawCheckMark(const wxRect& rect)
 183         { DoDrawCheckMark(rect.x, rect.y, rect.width, rect.height); }
 184
 185     void DrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 186                          double sa, double ea)
 187         { DoDrawEllipticArc(x, y, w, h, sa, ea); }
 188     void DrawEllipticArc(const wxPoint& pt, const wxSize& sz,
 189                          double sa, double ea)
 190         { DoDrawEllipticArc(pt.x, pt.y, sz.x, sz.y, sa, ea); }
 191
 192     void DrawPoint(wxCoord x, wxCoord y)
 193         { DoDrawPoint(x, y); }
 194     void DrawPoint(const wxPoint& pt)
 195         { DoDrawPoint(pt.x, pt.y); }
 196
 197     void DrawLines(int n, wxPoint points[],
 198                    wxCoord xoffset = 0, wxCoord yoffset = 0)
 199         { DoDrawLines(n, points, xoffset, yoffset); }
 200     void DrawLines(const wxList *list,
 201                    wxCoord xoffset = 0, wxCoord yoffset = 0);
 202
 203     void DrawPolygon(int n, wxPoint points[],
 204                      wxCoord xoffset = 0, wxCoord yoffset = 0,
 205                      int fillStyle = wxODDEVEN_RULE)
 206         { DoDrawPolygon(n, points, xoffset, yoffset, fillStyle); }
 207
 208     void DrawPolygon(const wxList *list,
 209                      wxCoord xoffset = 0, wxCoord yoffset = 0,
 210                      int fillStyle = wxODDEVEN_RULE);
 211
 212     void DrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 213         { DoDrawRectangle(x, y, width, height); }
 214     void DrawRectangle(const wxPoint& pt, const wxSize& sz)
 215         { DoDrawRectangle(pt.x, pt.y, sz.x, sz.y); }
 216     void DrawRectangle(const wxRect& rect)
 217         { DoDrawRectangle(rect.x, rect.y, rect.width, rect.height); }
 218
 219     void DrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height,
 220                               double radius)
 221         { DoDrawRoundedRectangle(x, y, width, height, radius); }
 222     void DrawRoundedRectangle(const wxPoint& pt, const wxSize& sz,
 223                              double radius)
 224         { DoDrawRoundedRectangle(pt.x, pt.y, sz.x, sz.y, radius); }
 225     void DrawRoundedRectangle(const wxRect& r, double radius)
 226         { DoDrawRoundedRectangle(r.x, r.y, r.width, r.height, radius); }
 227
 228     void DrawCircle(wxCoord x, wxCoord y, wxCoord radius)
 229         { DoDrawEllipse(x - radius, y - radius, 2*radius, 2*radius); }
 230     void DrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 231         { DoDrawEllipse(x, y, width, height); }
 232     void DrawEllipse(const wxPoint& pt, const wxSize& sz)
 233         { DoDrawEllipse(pt.x, pt.y, sz.x, sz.y); }
 234     void DrawEllipse(const wxRect& rect)
 235         { DoDrawEllipse(rect.x, rect.y, rect.width, rect.height); }
 236
 237     void DrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 238         { DoDrawIcon(icon, x, y); }
 239     void DrawIcon(const wxIcon& icon, const wxPoint& pt)
 240         { DoDrawIcon(icon, pt.x, pt.y); }
 241
 242     void DrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 243                     bool useMask = FALSE)
 244         { DoDrawBitmap(bmp, x, y, useMask); }
 245     void DrawBitmap(const wxBitmap &bmp, const wxPoint& pt,
 246                     bool useMask = FALSE)
 247         { DoDrawBitmap(bmp, pt.x, pt.y, useMask); }
 248
 249     void DrawText(const wxString& text, wxCoord x, wxCoord y)
 250         { DoDrawText(text, x, y); }
 251     void DrawText(const wxString& text, const wxPoint& pt)
 252         { DoDrawText(text, pt.x, pt.y); }
 253
 254     void DrawRotatedText(const wxString& text, wxCoord x, wxCoord y, double angle)
 255         { DoDrawRotatedText(text, x, y, angle); }
 256     void DrawRotatedText(const wxString& text, const wxPoint& pt, double angle)
 257         { DoDrawRotatedText(text, pt.x, pt.y, angle); }
 258
 259     // this version puts both optional bitmap and the text into the given
 260     // rectangle and aligns is as specified by alignment parameter; it also
 261     // will emphasize the character with the given index if it is != -1 and
 262     // return the bounding rectangle if required
 263     virtual void DrawLabel(const wxString& text,
 264                            const wxBitmap& image,
 265                            const wxRect& rect,
 266                            int alignment = wxALIGN_LEFT | wxALIGN_TOP,
 267                            int indexAccel = -1,
 268                            wxRect *rectBounding = NULL);
 269
 270     void DrawLabel(const wxString& text, const wxRect& rect,
 271                    int alignment = wxALIGN_LEFT | wxALIGN_TOP,
 272                    int indexAccel = -1)
 273         { DrawLabel(text, wxNullBitmap, rect, alignment, indexAccel); }
 274
 275     bool Blit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 276               wxDC *source, wxCoord xsrc, wxCoord ysrc,
 277               int rop = wxCOPY, bool useMask = FALSE)
 278     {
 279         return DoBlit(xdest, ydest, width, height,
 280                       source, xsrc, ysrc, rop, useMask);
 281     }
 282     bool Blit(const wxPoint& destPt, const wxSize& sz,
 283               wxDC *source, const wxPoint& srcPt,
 284               int rop = wxCOPY, bool useMask = FALSE)
 285     {
 286         return DoBlit(destPt.x, destPt.y, sz.x, sz.y,
 287                       source, srcPt.x, srcPt.y, rop, useMask);
 288     }
 289
 290 #if wxUSE_SPLINES
 291     // TODO: this API needs fixing (wxPointList, why (!const) "wxList *"?)
 292     void DrawSpline(wxCoord x1, wxCoord y1,
 293                     wxCoord x2, wxCoord y2,
 294                     wxCoord x3, wxCoord y3);
 295     void DrawSpline(int n, wxPoint points[]);
 296
 297     void DrawSpline(wxList *points) { DoDrawSpline(points); }
 298 #endif // wxUSE_SPLINES
 299
 300     // global DC operations
 301     // --------------------
 302
 303     virtual void Clear() = 0;
 304
 305     virtual bool StartDoc(const wxString& WXUNUSED(message)) { return TRUE; }
 306     virtual void EndDoc() { }
 307
 308     virtual void StartPage() { }
 309     virtual void EndPage() { }
 310
 311     // set objects to use for drawing
 312     // ------------------------------
 313
 314     virtual void SetFont(const wxFont& font) = 0;
 315     virtual void SetPen(const wxPen& pen) = 0;
 316     virtual void SetBrush(const wxBrush& brush) = 0;
 317     virtual void SetBackground(const wxBrush& brush) = 0;
 318     virtual void SetBackgroundMode(int mode) = 0;
 319     virtual void SetPalette(const wxPalette& palette) = 0;
 320
 321     // clipping region
 322     // ---------------
 323
 324     void SetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 325         { DoSetClippingRegion(x, y, width, height); }
 326     void SetClippingRegion(const wxPoint& pt, const wxSize& sz)
 327         { DoSetClippingRegion(pt.x, pt.y, sz.x, sz.y); }
 328     void SetClippingRegion(const wxRect& rect)
 329         { DoSetClippingRegion(rect.x, rect.y, rect.width, rect.height); }
 330     void SetClippingRegion(const wxRegion& region)
 331         { DoSetClippingRegionAsRegion(region); }
 332
 333     virtual void DestroyClippingRegion() = 0;
 334
 335     void GetClippingBox(wxCoord *x, wxCoord *y, wxCoord *w, wxCoord *h) const
 336         { DoGetClippingBox(x, y, w, h); }
 337     void GetClippingBox(wxRect& rect) const
 338         {
 339           // Necessary to use intermediate variables for 16-bit compilation
 340           wxCoord x, y, w, h;
 341           DoGetClippingBox(&x, &y, &w, &h);
 342           rect.x = x; rect.y = y; rect.width = w; rect.height = h;
 343         }
 344
 345     // text extent
 346     // -----------
 347
 348     virtual wxCoord GetCharHeight() const = 0;
 349     virtual wxCoord GetCharWidth() const = 0;
 350
 351     // only works for single line strings
 352     void GetTextExtent(const wxString& string,
 353                        wxCoord *x, wxCoord *y,
 354                        wxCoord *descent = NULL,
 355                        wxCoord *externalLeading = NULL,
 356                        wxFont *theFont = NULL) const
 357         { DoGetTextExtent(string, x, y, descent, externalLeading, theFont); }
 358
 359     // works for single as well as multi-line strings
 360     virtual void GetMultiLineTextExtent(const wxString& text,
 361                                         wxCoord *width,
 362                                         wxCoord *height,
 363                                         wxCoord *heightLine = NULL,
 364                                         wxFont *font = NULL);
 365
 366     // size and resolution
 367     // -------------------
 368
 369     // in device units
 370     void GetSize(int *width, int *height) const
 371         { DoGetSize(width, height); }
 372     wxSize GetSize() const
 373     {
 374         int w, h;
 375         DoGetSize(&w, &h);
 376
 377         return wxSize(w, h);
 378     }
 379
 380     // in mm
 381     void GetSizeMM(int* width, int* height) const
 382         { DoGetSizeMM(width, height); }
 383     wxSize GetSizeMM() const
 384     {
 385         int w, h;
 386         DoGetSizeMM(&w, &h);
 387
 388         return wxSize(w, h);
 389     }
 390
 391     // coordinates conversions
 392     // -----------------------
 393
 394     // This group of functions does actual conversion of the input, as you'd
 395     // expect.
 396     wxCoord DeviceToLogicalX(wxCoord x) const;
 397     wxCoord DeviceToLogicalY(wxCoord y) const;
 398     wxCoord DeviceToLogicalXRel(wxCoord x) const;
 399     wxCoord DeviceToLogicalYRel(wxCoord y) const;
 400     wxCoord LogicalToDeviceX(wxCoord x) const;
 401     wxCoord LogicalToDeviceY(wxCoord y) const;
 402     wxCoord LogicalToDeviceXRel(wxCoord x) const;
 403     wxCoord LogicalToDeviceYRel(wxCoord y) const;
 404
 405     // query DC capabilities
 406     // ---------------------
 407
 408     virtual bool CanDrawBitmap() const = 0;
 409     virtual bool CanGetTextExtent() const = 0;
 410
 411     // colour depth
 412     virtual int GetDepth() const = 0;
 413
 414     // Resolution in Pixels per inch
 415     virtual wxSize GetPPI() const = 0;
 416
 417     virtual bool Ok() const { return m_ok; }
 418
 419     // accessors
 420     // ---------
 421
 422         // const...
 423     int GetBackgroundMode() const { return m_backgroundMode; }
 424     const wxBrush&  GetBackground() const { return m_backgroundBrush; }
 425     const wxBrush&  GetBrush() const { return m_brush; }
 426     const wxFont&   GetFont() const { return m_font; }
 427     const wxPen&    GetPen() const { return m_pen; }
 428     const wxColour& GetTextBackground() const { return m_textBackgroundColour; }
 429     const wxColour& GetTextForeground() const { return m_textForegroundColour; }
 430
 431         // ... and non const
 432     wxBrush&  GetBackground() { return m_backgroundBrush; }
 433     wxBrush&  GetBrush() { return m_brush; }
 434     wxFont&   GetFont() { return m_font; }
 435     wxPen&    GetPen() { return m_pen; }
 436     wxColour& GetTextBackground() { return m_textBackgroundColour; }
 437     wxColour& GetTextForeground() { return m_textForegroundColour; }
 438
 439     virtual void SetTextForeground(const wxColour& colour)
 440         { m_textForegroundColour = colour; }
 441     virtual void SetTextBackground(const wxColour& colour)
 442         { m_textBackgroundColour = colour; }
 443
 444     int GetMapMode() const { return m_mappingMode; }
 445     virtual void SetMapMode(int mode) = 0;
 446
 447     virtual void GetUserScale(double *x, double *y) const
 448     {
 449         if ( x ) *x = m_userScaleX;
 450         if ( y ) *y = m_userScaleY;
 451     }
 452     virtual void SetUserScale(double x, double y) = 0;
 453
 454     virtual void GetLogicalScale(double *x, double *y)
 455     {
 456         if ( x ) *x = m_logicalScaleX;
 457         if ( y ) *y = m_logicalScaleY;
 458     }
 459     virtual void SetLogicalScale(double x, double y)
 460     {
 461         m_logicalScaleX = x;
 462         m_logicalScaleY = y;
 463     }
 464
 465     void GetLogicalOrigin(wxCoord *x, wxCoord *y) const
 466         { DoGetLogicalOrigin(x, y); }
 467     wxPoint GetLogicalOrigin() const
 468         { wxCoord x, y; DoGetLogicalOrigin(&x, &y); return wxPoint(x, y); }
 469     virtual void SetLogicalOrigin(wxCoord x, wxCoord y) = 0;
 470
 471     void GetDeviceOrigin(wxCoord *x, wxCoord *y) const
 472         { DoGetDeviceOrigin(x, y); }
 473     wxPoint GetDeviceOrigin() const
 474         { wxCoord x, y; DoGetDeviceOrigin(&x, &y); return wxPoint(x, y); }
 475     virtual void SetDeviceOrigin(wxCoord x, wxCoord y) = 0;
 476
 477     virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp) = 0;
 478
 479     int GetLogicalFunction() const { return m_logicalFunction; }
 480     virtual void SetLogicalFunction(int function) = 0;
 481
 482     // Sometimes we need to override optimization, e.g. if other software is
 483     // drawing onto our surface and we can't be sure of who's done what.
 484     //
 485     // FIXME: is this (still) used?
 486     virtual void SetOptimization(bool WXUNUSED(opt)) { }
 487     virtual bool GetOptimization() { return FALSE; }
 488
 489     // bounding box
 490     // ------------
 491
 492     virtual void CalcBoundingBox(wxCoord x, wxCoord y)
 493     {
 494       if ( m_isBBoxValid )
 495       {
 496          if ( x < m_minX ) m_minX = x;
 497          if ( y < m_minY ) m_minY = y;
 498          if ( x > m_maxX ) m_maxX = x;
 499          if ( y > m_maxY ) m_maxY = y;
 500       }
 501       else
 502       {
 503          m_isBBoxValid = TRUE;
 504
 505          m_minX = x;
 506          m_minY = y;
 507          m_maxX = x;
 508          m_maxY = y;
 509       }
 510     }
 511
 512     void ResetBoundingBox()
 513     {
 514         m_isBBoxValid = FALSE;
 515
 516         m_minX = m_maxX = m_minY = m_maxY = 0;
 517     }
 518
 519     // Get the final bounding box of the PostScript or Metafile picture.
 520     wxCoord MinX() const { return m_minX; }
 521     wxCoord MaxX() const { return m_maxX; }
 522     wxCoord MinY() const { return m_minY; }
 523     wxCoord MaxY() const { return m_maxY; }
 524
 525     // misc old functions
 526     // ------------------
 527
 528     // for compatibility with the old code when wxCoord was long everywhere
 529 #ifndef __WIN16__
 530     void GetTextExtent(const wxString& string,
 531                        long *x, long *y,
 532                        long *descent = NULL,
 533                        long *externalLeading = NULL,
 534                        wxFont *theFont = NULL) const
 535     {
 536         wxCoord x2, y2, descent2, externalLeading2;
 537         DoGetTextExtent(string, &x2, &y2,
 538                         &descent2, &externalLeading2,
 539                         theFont);
 540         if ( x )
 541             *x = x2;
 542         if ( y )
 543             *y = y2;
 544         if ( descent )
 545             *descent = descent2;
 546         if ( externalLeading )
 547             *externalLeading = externalLeading2;
 548     }
 549
 550     void GetLogicalOrigin(long *x, long *y) const
 551     {
 552         wxCoord x2, y2;
 553         DoGetLogicalOrigin(&x2, &y2);
 554         if ( x )
 555             *x = x2;
 556         if ( y )
 557             *y = y2;
 558     }
 559
 560     void GetDeviceOrigin(long *x, long *y) const
 561     {
 562         wxCoord x2, y2;
 563         DoGetDeviceOrigin(&x2, &y2);
 564         if ( x )
 565             *x = x2;
 566         if ( y )
 567             *y = y2;
 568     }
 569     void GetClippingBox(long *x, long *y, long *w, long *h) const
 570     {
 571         wxCoord xx,yy,ww,hh;
 572         DoGetClippingBox(&xx, &yy, &ww, &hh);
 573         if (x) *x = xx;
 574         if (y) *y = yy;
 575         if (w) *w = ww;
 576         if (h) *h = hh;
 577     }
 578 #endif // !Win16
 579
 580 #if WXWIN_COMPATIBILITY
 581     virtual void SetColourMap(const wxPalette& palette) { SetPalette(palette); }
 582     void GetTextExtent(const wxString& string, float *x, float *y,
 583             float *descent = NULL, float *externalLeading = NULL,
 584             wxFont *theFont = NULL, bool use16bit = FALSE) const ;
 585     void GetSize(float* width, float* height) const { int w, h; GetSize(& w, & h); *width = w; *height = h; }
 586     void GetSizeMM(float *width, float *height) const { long w, h; GetSizeMM(& w, & h); *width = (float) w; *height = (float) h; }
 587 #endif // WXWIN_COMPATIBILITY
 588
 589 protected:
 590     // the pure virtual functions which should be implemented by wxDC
 591     virtual void DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
 592                              int style = wxFLOOD_SURFACE) = 0;
 593
 594     virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const = 0;
 595
 596     virtual void DoDrawPoint(wxCoord x, wxCoord y) = 0;
 597     virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2) = 0;
 598
 599     virtual void DoDrawArc(wxCoord x1, wxCoord y1,
 600                            wxCoord x2, wxCoord y2,
 601                            wxCoord xc, wxCoord yc) = 0;
 602     virtual void DoDrawCheckMark(wxCoord x, wxCoord y,
 603                                  wxCoord width, wxCoord height);
 604     virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 605                                    double sa, double ea) = 0;
 606
 607     virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height) = 0;
 608     virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 609                                         wxCoord width, wxCoord height,
 610                                         double radius) = 0;
 611     virtual void DoDrawEllipse(wxCoord x, wxCoord y,
 612                                wxCoord width, wxCoord height) = 0;
 613
 614     virtual void DoCrossHair(wxCoord x, wxCoord y) = 0;
 615
 616     virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y) = 0;
 617     virtual void DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 618                               bool useMask = FALSE) = 0;
 619
 620     virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y) = 0;
 621     virtual void DoDrawRotatedText(const wxString& text,
 622                                    wxCoord x, wxCoord y, double angle) = 0;
 623
 624     virtual bool DoBlit(wxCoord xdest, wxCoord ydest,
 625                         wxCoord width, wxCoord height,
 626                         wxDC *source, wxCoord xsrc, wxCoord ysrc,
 627                         int rop = wxCOPY, bool useMask = FALSE) = 0;
 628
 629     virtual void DoGetSize(int *width, int *height) const = 0;
 630     virtual void DoGetSizeMM(int* width, int* height) const = 0;
 631
 632     virtual void DoDrawLines(int n, wxPoint points[],
 633                              wxCoord xoffset, wxCoord yoffset) = 0;
 634     virtual void DoDrawPolygon(int n, wxPoint points[],
 635                                wxCoord xoffset, wxCoord yoffset,
 636                                int fillStyle = wxODDEVEN_RULE) = 0;
 637
 638     virtual void DoSetClippingRegionAsRegion(const wxRegion& region) = 0;
 639     virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
 640                                      wxCoord width, wxCoord height) = 0;
 641
 642     // FIXME are these functions really different?
 643     virtual void DoGetClippingRegion(wxCoord *x, wxCoord *y,
 644                                      wxCoord *w, wxCoord *h)
 645         { DoGetClippingBox(x, y, w, h); }
 646     virtual void DoGetClippingBox(wxCoord *x, wxCoord *y,
 647                                   wxCoord *w, wxCoord *h) const
 648     {
 649         if ( m_clipping )
 650         {
 651             if ( x ) *x = m_clipX1;
 652             if ( y ) *y = m_clipY1;
 653             if ( w ) *w = m_clipX2 - m_clipX1;
 654             if ( h ) *h = m_clipY2 - m_clipY1;
 655         }
 656         else
 657         {
 658             *x = *y = *w = *h = 0;
 659         }
 660     }
 661
 662     virtual void DoGetLogicalOrigin(wxCoord *x, wxCoord *y) const
 663     {
 664         if ( x ) *x = m_logicalOriginX;
 665         if ( y ) *y = m_logicalOriginY;
 666     }
 667
 668     virtual void DoGetDeviceOrigin(wxCoord *x, wxCoord *y) const
 669     {
 670         if ( x ) *x = m_deviceOriginX;
 671         if ( y ) *y = m_deviceOriginY;
 672     }
 673
 674     virtual void DoGetTextExtent(const wxString& string,
 675                                  wxCoord *x, wxCoord *y,
 676                                  wxCoord *descent = NULL,
 677                                  wxCoord *externalLeading = NULL,
 678                                  wxFont *theFont = NULL) const = 0;
 679
 680 #if wxUSE_SPLINES
 681     virtual void DoDrawSpline(wxList *points);
 682 #endif
 683
 684 protected:
 685     // flags
 686     bool m_colour:1;
 687     bool m_ok:1;
 688     bool m_clipping:1;
 689     bool m_isInteractive:1;
 690     bool m_isBBoxValid:1;
 691
 692     // coordinate system variables
 693
 694     // TODO short descriptions of what exactly they are would be nice...
 695
 696     wxCoord m_logicalOriginX, m_logicalOriginY;
 697     wxCoord m_deviceOriginX, m_deviceOriginY;
 698
 699     double m_logicalScaleX, m_logicalScaleY;
 700     double m_userScaleX, m_userScaleY;
 701     double m_scaleX, m_scaleY;
 702
 703     // Used by SetAxisOrientation() to invert the axes
 704     int m_signX, m_signY;
 705
 706     // bounding and clipping boxes
 707     wxCoord m_minX, m_minY, m_maxX, m_maxY;
 708     wxCoord m_clipX1, m_clipY1, m_clipX2, m_clipY2;
 709
 710     int m_logicalFunction;
 711     int m_backgroundMode;
 712     int m_mappingMode;
 713
 714     // GDI objects
 715     wxPen             m_pen;
 716     wxBrush           m_brush;
 717     wxBrush           m_backgroundBrush;
 718     wxColour          m_textForegroundColour;
 719     wxColour          m_textBackgroundColour;
 720     wxFont            m_font;
 721     wxPalette         m_palette;
 722
 723 private:
 724     DECLARE_NO_COPY_CLASS(wxDCBase)
 725     DECLARE_ABSTRACT_CLASS(wxDCBase)
 726 };
 727
 728 // ----------------------------------------------------------------------------
 729 // now include the declaration of wxDC class
 730 // ----------------------------------------------------------------------------
 731
 732 #if defined(__WXMSW__)
 733     #include "wx/msw/dc.h"
 734 #elif defined(__WXMOTIF__)
 735     #include "wx/motif/dc.h"
 736 #elif defined(__WXGTK__)
 737     #include "wx/gtk/dc.h"
 738 #elif defined(__WXMGL__)
 739     #include "wx/mgl/dc.h"
 740 #elif defined(__WXQT__)
 741     #include "wx/qt/dc.h"
 742 #elif defined(__WXMAC__)
 743     #include "wx/mac/dc.h"
 744 #elif defined(__WXPM__)
 745     #include "wx/os2/dc.h"
 746 #elif defined(__WXSTUBS__)
 747     #include "wx/stubs/dc.h"
 748 #endif
 749
 750 // ----------------------------------------------------------------------------
 751 // helper class: you can use it to temporarily change the DC text colour and
 752 // restore it automatically when the object goes out of scope
 753 // ----------------------------------------------------------------------------
 754
 755 class WXDLLEXPORT wxDCTextColourChanger
 756 {
 757 public:
 758     wxDCTextColourChanger(wxDC& dc) : m_dc(dc) { }
 759
 760     ~wxDCTextColourChanger()
 761     {
 762         if ( m_colFgOld.Ok() )
 763             m_dc.SetTextForeground(m_colFgOld);
 764     }
 765
 766     void Set(const wxColour& col)
 767     {
 768         if ( !m_colFgOld.Ok() )
 769             m_colFgOld = m_dc.GetTextForeground();
 770         m_dc.SetTextForeground(col);
 771     }
 772
 773 private:
 774     wxDC& m_dc;
 775
 776     wxColour m_colFgOld;
 777 };
 778
 779 #endif
 780     // _WX_DC_H_BASE_