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 #include "wx/list.h"            // we use wxList in inline functions
  32
  33 class WXDLLEXPORT wxDCBase;
  34
  35 class WXDLLEXPORT wxDrawObject
  36 {
  37 public:
  38
  39     wxDrawObject()
  40         : m_isBBoxValid(FALSE)
  41         , m_minX(0), m_minY(0), m_maxX(0), m_maxY(0)
  42     { }
  43
  44     virtual ~wxDrawObject() { }
  45
  46     virtual void Draw(wxDCBase&) const { }
  47
  48     virtual void CalcBoundingBox(wxCoord x, wxCoord y)
  49     {
  50       if ( m_isBBoxValid )
  51       {
  52          if ( x < m_minX ) m_minX = x;
  53          if ( y < m_minY ) m_minY = y;
  54          if ( x > m_maxX ) m_maxX = x;
  55          if ( y > m_maxY ) m_maxY = y;
  56       }
  57       else
  58       {
  59          m_isBBoxValid = TRUE;
  60
  61          m_minX = x;
  62          m_minY = y;
  63          m_maxX = x;
  64          m_maxY = y;
  65       }
  66     }
  67
  68     void ResetBoundingBox()
  69     {
  70         m_isBBoxValid = FALSE;
  71
  72         m_minX = m_maxX = m_minY = m_maxY = 0;
  73     }
  74
  75     // Get the final bounding box of the PostScript or Metafile picture.
  76
  77     wxCoord MinX() const { return m_minX; }
  78     wxCoord MaxX() const { return m_maxX; }
  79     wxCoord MinY() const { return m_minY; }
  80     wxCoord MaxY() const { return m_maxY; }
  81
  82     //to define the type of object for derived objects
  83     virtual int GetType()=0;
  84
  85 protected:
  86     //for boundingbox calculation
  87     bool m_isBBoxValid:1;
  88     //for boundingbox calculation
  89     wxCoord m_minX, m_minY, m_maxX, m_maxY;
  90 };
  91
  92 // ---------------------------------------------------------------------------
  93 // global variables
  94 // ---------------------------------------------------------------------------
  95
  96 WXDLLEXPORT_DATA(extern int) wxPageNumber;
  97
  98 // ---------------------------------------------------------------------------
  99 // wxDC is the device context - object on which any drawing is done
 100 // ---------------------------------------------------------------------------
 101
 102 class WXDLLEXPORT wxDCBase : public wxObject
 103 {
 104 public:
 105     wxDCBase()
 106         : m_colour(wxColourDisplay())
 107         , m_ok(TRUE)
 108         , m_clipping(FALSE)
 109         , m_isInteractive(0)
 110         , m_isBBoxValid(FALSE)
 111         , m_logicalOriginX(0), m_logicalOriginY(0)
 112         , m_deviceOriginX(0), m_deviceOriginY(0)
 113         , m_logicalScaleX(1.0), m_logicalScaleY(1.0)
 114         , m_userScaleX(1.0), m_userScaleY(1.0)
 115         , m_scaleX(1.0), m_scaleY(1.0)
 116         , m_signX(1), m_signY(1)
 117         , m_minX(0), m_minY(0), m_maxX(0), m_maxY(0)
 118         , m_clipX1(0), m_clipY1(0), m_clipX2(0), m_clipY2(0)
 119         , m_logicalFunction(wxCOPY)
 120         , m_backgroundMode(wxTRANSPARENT)
 121         , m_mappingMode(wxMM_TEXT)
 122         , m_pen()
 123         , m_brush()
 124         , m_backgroundBrush(*wxTRANSPARENT_BRUSH)
 125         , m_textForegroundColour(*wxBLACK)
 126         , m_textBackgroundColour(*wxWHITE)
 127         , m_font()
 128 #if wxUSE_PALETTE
 129         , m_palette()
 130         , m_hasCustomPalette(FALSE)
 131 #endif // wxUSE_PALETTE
 132     {
 133         ResetBoundingBox();
 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     bool FloodFill(wxCoord x, wxCoord y, const wxColour& col,
 152                    int style = wxFLOOD_SURFACE)
 153         { return DoFloodFill(x, y, col, style); }
 154     bool FloodFill(const wxPoint& pt, const wxColour& col,
 155                    int style = wxFLOOD_SURFACE)
 156         { return 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 DrawCircle(const wxPoint& pt, wxCoord radius)
 231         { DrawCircle(pt.x, pt.y, radius); }
 232
 233     void DrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 234         { DoDrawEllipse(x, y, width, height); }
 235     void DrawEllipse(const wxPoint& pt, const wxSize& sz)
 236         { DoDrawEllipse(pt.x, pt.y, sz.x, sz.y); }
 237     void DrawEllipse(const wxRect& rect)
 238         { DoDrawEllipse(rect.x, rect.y, rect.width, rect.height); }
 239
 240     void DrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 241         { DoDrawIcon(icon, x, y); }
 242     void DrawIcon(const wxIcon& icon, const wxPoint& pt)
 243         { DoDrawIcon(icon, pt.x, pt.y); }
 244
 245     void DrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 246                     bool useMask = FALSE)
 247         { DoDrawBitmap(bmp, x, y, useMask); }
 248     void DrawBitmap(const wxBitmap &bmp, const wxPoint& pt,
 249                     bool useMask = FALSE)
 250         { DoDrawBitmap(bmp, pt.x, pt.y, useMask); }
 251
 252     void DrawText(const wxString& text, wxCoord x, wxCoord y)
 253         { DoDrawText(text, x, y); }
 254     void DrawText(const wxString& text, const wxPoint& pt)
 255         { DoDrawText(text, pt.x, pt.y); }
 256
 257     void DrawRotatedText(const wxString& text, wxCoord x, wxCoord y, double angle)
 258         { DoDrawRotatedText(text, x, y, angle); }
 259     void DrawRotatedText(const wxString& text, const wxPoint& pt, double angle)
 260         { DoDrawRotatedText(text, pt.x, pt.y, angle); }
 261
 262     // this version puts both optional bitmap and the text into the given
 263     // rectangle and aligns is as specified by alignment parameter; it also
 264     // will emphasize the character with the given index if it is != -1 and
 265     // return the bounding rectangle if required
 266     virtual void DrawLabel(const wxString& text,
 267                            const wxBitmap& image,
 268                            const wxRect& rect,
 269                            int alignment = wxALIGN_LEFT | wxALIGN_TOP,
 270                            int indexAccel = -1,
 271                            wxRect *rectBounding = NULL);
 272
 273     void DrawLabel(const wxString& text, const wxRect& rect,
 274                    int alignment = wxALIGN_LEFT | wxALIGN_TOP,
 275                    int indexAccel = -1)
 276         { DrawLabel(text, wxNullBitmap, rect, alignment, indexAccel); }
 277
 278     bool Blit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 279               wxDC *source, wxCoord xsrc, wxCoord ysrc,
 280               int rop = wxCOPY, bool useMask = FALSE, wxCoord xsrcMask = -1, wxCoord ysrcMask = -1)
 281     {
 282         return DoBlit(xdest, ydest, width, height,
 283                       source, xsrc, ysrc, rop, useMask, xsrcMask, ysrcMask);
 284     }
 285     bool Blit(const wxPoint& destPt, const wxSize& sz,
 286               wxDC *source, const wxPoint& srcPt,
 287               int rop = wxCOPY, bool useMask = FALSE, const wxPoint& srcPtMask = wxPoint(-1, -1))
 288     {
 289         return DoBlit(destPt.x, destPt.y, sz.x, sz.y,
 290                       source, srcPt.x, srcPt.y, rop, useMask, srcPtMask.x, srcPtMask.y);
 291     }
 292
 293 #if wxUSE_SPLINES
 294     // TODO: this API needs fixing (wxPointList, why (!const) "wxList *"?)
 295     void DrawSpline(wxCoord x1, wxCoord y1,
 296                     wxCoord x2, wxCoord y2,
 297                     wxCoord x3, wxCoord y3);
 298     void DrawSpline(int n, wxPoint points[]);
 299
 300     void DrawSpline(wxList *points) { DoDrawSpline(points); }
 301 #endif // wxUSE_SPLINES
 302
 303     // global DC operations
 304     // --------------------
 305
 306     virtual void Clear() = 0;
 307
 308     virtual bool StartDoc(const wxString& WXUNUSED(message)) { return TRUE; }
 309     virtual void EndDoc() { }
 310
 311     virtual void StartPage() { }
 312     virtual void EndPage() { }
 313
 314     // set objects to use for drawing
 315     // ------------------------------
 316
 317     virtual void SetFont(const wxFont& font) = 0;
 318     virtual void SetPen(const wxPen& pen) = 0;
 319     virtual void SetBrush(const wxBrush& brush) = 0;
 320     virtual void SetBackground(const wxBrush& brush) = 0;
 321     virtual void SetBackgroundMode(int mode) = 0;
 322 #if wxUSE_PALETTE
 323     virtual void SetPalette(const wxPalette& palette) = 0;
 324 #endif // wxUSE_PALETTE
 325
 326     // clipping region
 327     // ---------------
 328
 329     void SetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 330         { DoSetClippingRegion(x, y, width, height); }
 331     void SetClippingRegion(const wxPoint& pt, const wxSize& sz)
 332         { DoSetClippingRegion(pt.x, pt.y, sz.x, sz.y); }
 333     void SetClippingRegion(const wxRect& rect)
 334         { DoSetClippingRegion(rect.x, rect.y, rect.width, rect.height); }
 335     void SetClippingRegion(const wxRegion& region)
 336         { DoSetClippingRegionAsRegion(region); }
 337
 338     virtual void DestroyClippingRegion() = 0;
 339
 340     void GetClippingBox(wxCoord *x, wxCoord *y, wxCoord *w, wxCoord *h) const
 341         { DoGetClippingBox(x, y, w, h); }
 342     void GetClippingBox(wxRect& rect) const
 343         {
 344           // Necessary to use intermediate variables for 16-bit compilation
 345           wxCoord x, y, w, h;
 346           DoGetClippingBox(&x, &y, &w, &h);
 347           rect.x = x; rect.y = y; rect.width = w; rect.height = h;
 348         }
 349
 350     // text extent
 351     // -----------
 352
 353     virtual wxCoord GetCharHeight() const = 0;
 354     virtual wxCoord GetCharWidth() const = 0;
 355
 356     // only works for single line strings
 357     void GetTextExtent(const wxString& string,
 358                        wxCoord *x, wxCoord *y,
 359                        wxCoord *descent = NULL,
 360                        wxCoord *externalLeading = NULL,
 361                        wxFont *theFont = NULL) const
 362         { DoGetTextExtent(string, x, y, descent, externalLeading, theFont); }
 363
 364     // works for single as well as multi-line strings
 365     virtual void GetMultiLineTextExtent(const wxString& text,
 366                                         wxCoord *width,
 367                                         wxCoord *height,
 368                                         wxCoord *heightLine = NULL,
 369                                         wxFont *font = NULL);
 370
 371     // size and resolution
 372     // -------------------
 373
 374     // in device units
 375     void GetSize(int *width, int *height) const
 376         { DoGetSize(width, height); }
 377     wxSize GetSize() const
 378     {
 379         int w, h;
 380         DoGetSize(&w, &h);
 381
 382         return wxSize(w, h);
 383     }
 384
 385     // in mm
 386     void GetSizeMM(int* width, int* height) const
 387         { DoGetSizeMM(width, height); }
 388     wxSize GetSizeMM() const
 389     {
 390         int w, h;
 391         DoGetSizeMM(&w, &h);
 392
 393         return wxSize(w, h);
 394     }
 395
 396     // coordinates conversions
 397     // -----------------------
 398
 399     // This group of functions does actual conversion of the input, as you'd
 400     // expect.
 401     wxCoord DeviceToLogicalX(wxCoord x) const;
 402     wxCoord DeviceToLogicalY(wxCoord y) const;
 403     wxCoord DeviceToLogicalXRel(wxCoord x) const;
 404     wxCoord DeviceToLogicalYRel(wxCoord y) const;
 405     wxCoord LogicalToDeviceX(wxCoord x) const;
 406     wxCoord LogicalToDeviceY(wxCoord y) const;
 407     wxCoord LogicalToDeviceXRel(wxCoord x) const;
 408     wxCoord LogicalToDeviceYRel(wxCoord y) const;
 409
 410     // query DC capabilities
 411     // ---------------------
 412
 413     virtual bool CanDrawBitmap() const = 0;
 414     virtual bool CanGetTextExtent() const = 0;
 415
 416     // colour depth
 417     virtual int GetDepth() const = 0;
 418
 419     // Resolution in Pixels per inch
 420     virtual wxSize GetPPI() const = 0;
 421
 422     virtual bool Ok() const { return m_ok; }
 423
 424     // accessors
 425     // ---------
 426
 427         // const...
 428     int GetBackgroundMode() const { return m_backgroundMode; }
 429     const wxBrush&  GetBackground() const { return m_backgroundBrush; }
 430     const wxBrush&  GetBrush() const { return m_brush; }
 431     const wxFont&   GetFont() const { return m_font; }
 432     const wxPen&    GetPen() const { return m_pen; }
 433     const wxColour& GetTextBackground() const { return m_textBackgroundColour; }
 434     const wxColour& GetTextForeground() const { return m_textForegroundColour; }
 435
 436         // ... and non const
 437     wxBrush&  GetBackground() { return m_backgroundBrush; }
 438     wxBrush&  GetBrush() { return m_brush; }
 439     wxFont&   GetFont() { return m_font; }
 440     wxPen&    GetPen() { return m_pen; }
 441     wxColour& GetTextBackground() { return m_textBackgroundColour; }
 442     wxColour& GetTextForeground() { return m_textForegroundColour; }
 443
 444     virtual void SetTextForeground(const wxColour& colour)
 445         { m_textForegroundColour = colour; }
 446     virtual void SetTextBackground(const wxColour& colour)
 447         { m_textBackgroundColour = colour; }
 448
 449     int GetMapMode() const { return m_mappingMode; }
 450     virtual void SetMapMode(int mode) = 0;
 451
 452     virtual void GetUserScale(double *x, double *y) const
 453     {
 454         if ( x ) *x = m_userScaleX;
 455         if ( y ) *y = m_userScaleY;
 456     }
 457     virtual void SetUserScale(double x, double y) = 0;
 458
 459     virtual void GetLogicalScale(double *x, double *y)
 460     {
 461         if ( x ) *x = m_logicalScaleX;
 462         if ( y ) *y = m_logicalScaleY;
 463     }
 464     virtual void SetLogicalScale(double x, double y)
 465     {
 466         m_logicalScaleX = x;
 467         m_logicalScaleY = y;
 468     }
 469
 470     void GetLogicalOrigin(wxCoord *x, wxCoord *y) const
 471         { DoGetLogicalOrigin(x, y); }
 472     wxPoint GetLogicalOrigin() const
 473         { wxCoord x, y; DoGetLogicalOrigin(&x, &y); return wxPoint(x, y); }
 474     virtual void SetLogicalOrigin(wxCoord x, wxCoord y) = 0;
 475
 476     void GetDeviceOrigin(wxCoord *x, wxCoord *y) const
 477         { DoGetDeviceOrigin(x, y); }
 478     wxPoint GetDeviceOrigin() const
 479         { wxCoord x, y; DoGetDeviceOrigin(&x, &y); return wxPoint(x, y); }
 480     virtual void SetDeviceOrigin(wxCoord x, wxCoord y) = 0;
 481
 482     virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp) = 0;
 483
 484     int GetLogicalFunction() const { return m_logicalFunction; }
 485     virtual void SetLogicalFunction(int function) = 0;
 486
 487     // Sometimes we need to override optimization, e.g. if other software is
 488     // drawing onto our surface and we can't be sure of who's done what.
 489     //
 490     // FIXME: is this (still) used?
 491     virtual void SetOptimization(bool WXUNUSED(opt)) { }
 492     virtual bool GetOptimization() { return FALSE; }
 493
 494     // Some platforms have a DC cache, which should be cleared
 495     // at appropriate points such as after a series of DC operations.
 496     // Put ClearCache in the wxDC implementation class, since it has to be
 497     // static.
 498     // static void ClearCache() ;
 499 #if 0 // wxUSE_DC_CACHEING
 500     static void EnableCache(bool cacheing) { sm_cacheing = cacheing; }
 501     static bool CacheEnabled() { return sm_cacheing ; }
 502 #endif
 503
 504     // bounding box
 505     // ------------
 506
 507     virtual void CalcBoundingBox(wxCoord x, wxCoord y)
 508     {
 509       if ( m_isBBoxValid )
 510       {
 511          if ( x < m_minX ) m_minX = x;
 512          if ( y < m_minY ) m_minY = y;
 513          if ( x > m_maxX ) m_maxX = x;
 514          if ( y > m_maxY ) m_maxY = y;
 515       }
 516       else
 517       {
 518          m_isBBoxValid = TRUE;
 519
 520          m_minX = x;
 521          m_minY = y;
 522          m_maxX = x;
 523          m_maxY = y;
 524       }
 525     }
 526
 527     void ResetBoundingBox()
 528     {
 529         m_isBBoxValid = FALSE;
 530
 531         m_minX = m_maxX = m_minY = m_maxY = 0;
 532     }
 533
 534     // Get the final bounding box of the PostScript or Metafile picture.
 535     wxCoord MinX() const { return m_minX; }
 536     wxCoord MaxX() const { return m_maxX; }
 537     wxCoord MinY() const { return m_minY; }
 538     wxCoord MaxY() const { return m_maxY; }
 539
 540     // misc old functions
 541     // ------------------
 542
 543     // for compatibility with the old code when wxCoord was long everywhere
 544 #ifndef __WIN16__
 545     void GetTextExtent(const wxString& string,
 546                        long *x, long *y,
 547                        long *descent = NULL,
 548                        long *externalLeading = NULL,
 549                        wxFont *theFont = NULL) const
 550     {
 551         wxCoord x2, y2, descent2, externalLeading2;
 552         DoGetTextExtent(string, &x2, &y2,
 553                         &descent2, &externalLeading2,
 554                         theFont);
 555         if ( x )
 556             *x = x2;
 557         if ( y )
 558             *y = y2;
 559         if ( descent )
 560             *descent = descent2;
 561         if ( externalLeading )
 562             *externalLeading = externalLeading2;
 563     }
 564
 565     void GetLogicalOrigin(long *x, long *y) const
 566     {
 567         wxCoord x2, y2;
 568         DoGetLogicalOrigin(&x2, &y2);
 569         if ( x )
 570             *x = x2;
 571         if ( y )
 572             *y = y2;
 573     }
 574
 575     void GetDeviceOrigin(long *x, long *y) const
 576     {
 577         wxCoord x2, y2;
 578         DoGetDeviceOrigin(&x2, &y2);
 579         if ( x )
 580             *x = x2;
 581         if ( y )
 582             *y = y2;
 583     }
 584     void GetClippingBox(long *x, long *y, long *w, long *h) const
 585     {
 586         wxCoord xx,yy,ww,hh;
 587         DoGetClippingBox(&xx, &yy, &ww, &hh);
 588         if (x) *x = xx;
 589         if (y) *y = yy;
 590         if (w) *w = ww;
 591         if (h) *h = hh;
 592     }
 593 #endif // !Win16
 594
 595 #if WXWIN_COMPATIBILITY
 596
 597 #if wxUSE_PALETTE
 598     virtual void SetColourMap(const wxPalette& palette) { SetPalette(palette); }
 599 #endif // wxUSE_PALETTE
 600
 601     void GetTextExtent(const wxString& string, float *x, float *y,
 602             float *descent = NULL, float *externalLeading = NULL,
 603             wxFont *theFont = NULL, bool use16bit = FALSE) const ;
 604     void GetSize(float* width, float* height) const { int w, h; GetSize(& w, & h); *width = w; *height = h; }
 605     void GetSizeMM(float *width, float *height) const { long w, h; GetSizeMM(& w, & h); *width = (float) w; *height = (float) h; }
 606
 607 #endif // WXWIN_COMPATIBILITY
 608
 609 protected:
 610     // the pure virtual functions which should be implemented by wxDC
 611     virtual bool DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
 612                              int style = wxFLOOD_SURFACE) = 0;
 613
 614     virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const = 0;
 615
 616     virtual void DoDrawPoint(wxCoord x, wxCoord y) = 0;
 617     virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2) = 0;
 618
 619     virtual void DoDrawArc(wxCoord x1, wxCoord y1,
 620                            wxCoord x2, wxCoord y2,
 621                            wxCoord xc, wxCoord yc) = 0;
 622     virtual void DoDrawCheckMark(wxCoord x, wxCoord y,
 623                                  wxCoord width, wxCoord height);
 624     virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 625                                    double sa, double ea) = 0;
 626
 627     virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height) = 0;
 628     virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 629                                         wxCoord width, wxCoord height,
 630                                         double radius) = 0;
 631     virtual void DoDrawEllipse(wxCoord x, wxCoord y,
 632                                wxCoord width, wxCoord height) = 0;
 633
 634     virtual void DoCrossHair(wxCoord x, wxCoord y) = 0;
 635
 636     virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y) = 0;
 637     virtual void DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 638                               bool useMask = FALSE) = 0;
 639
 640     virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y) = 0;
 641     virtual void DoDrawRotatedText(const wxString& text,
 642                                    wxCoord x, wxCoord y, double angle) = 0;
 643
 644     virtual bool DoBlit(wxCoord xdest, wxCoord ydest,
 645                         wxCoord width, wxCoord height,
 646                         wxDC *source, wxCoord xsrc, wxCoord ysrc,
 647                         int rop = wxCOPY, bool useMask = FALSE, wxCoord xsrcMask = -1, wxCoord ysrcMask = -1) = 0;
 648
 649     virtual void DoGetSize(int *width, int *height) const = 0;
 650     virtual void DoGetSizeMM(int* width, int* height) const = 0;
 651
 652     virtual void DoDrawLines(int n, wxPoint points[],
 653                              wxCoord xoffset, wxCoord yoffset) = 0;
 654     virtual void DoDrawPolygon(int n, wxPoint points[],
 655                                wxCoord xoffset, wxCoord yoffset,
 656                                int fillStyle = wxODDEVEN_RULE) = 0;
 657
 658     virtual void DoSetClippingRegionAsRegion(const wxRegion& region) = 0;
 659     virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
 660                                      wxCoord width, wxCoord height) = 0;
 661
 662     // FIXME are these functions really different?
 663     virtual void DoGetClippingRegion(wxCoord *x, wxCoord *y,
 664                                      wxCoord *w, wxCoord *h)
 665         { DoGetClippingBox(x, y, w, h); }
 666     virtual void DoGetClippingBox(wxCoord *x, wxCoord *y,
 667                                   wxCoord *w, wxCoord *h) const
 668     {
 669         if ( m_clipping )
 670         {
 671             if ( x ) *x = m_clipX1;
 672             if ( y ) *y = m_clipY1;
 673             if ( w ) *w = m_clipX2 - m_clipX1;
 674             if ( h ) *h = m_clipY2 - m_clipY1;
 675         }
 676         else
 677         {
 678             *x = *y = *w = *h = 0;
 679         }
 680     }
 681
 682     virtual void DoGetLogicalOrigin(wxCoord *x, wxCoord *y) const
 683     {
 684         if ( x ) *x = m_logicalOriginX;
 685         if ( y ) *y = m_logicalOriginY;
 686     }
 687
 688     virtual void DoGetDeviceOrigin(wxCoord *x, wxCoord *y) const
 689     {
 690         if ( x ) *x = m_deviceOriginX;
 691         if ( y ) *y = m_deviceOriginY;
 692     }
 693
 694     virtual void DoGetTextExtent(const wxString& string,
 695                                  wxCoord *x, wxCoord *y,
 696                                  wxCoord *descent = NULL,
 697                                  wxCoord *externalLeading = NULL,
 698                                  wxFont *theFont = NULL) const = 0;
 699
 700 #if wxUSE_SPLINES
 701     virtual void DoDrawSpline(wxList *points);
 702 #endif
 703
 704 protected:
 705     // flags
 706     bool m_colour:1;
 707     bool m_ok:1;
 708     bool m_clipping:1;
 709     bool m_isInteractive:1;
 710     bool m_isBBoxValid:1;
 711 #if wxUSE_DC_CACHEING
 712 //    static bool sm_cacheing;
 713 #endif
 714
 715     // coordinate system variables
 716
 717     // TODO short descriptions of what exactly they are would be nice...
 718
 719     wxCoord m_logicalOriginX, m_logicalOriginY;
 720     wxCoord m_deviceOriginX, m_deviceOriginY;
 721
 722     double m_logicalScaleX, m_logicalScaleY;
 723     double m_userScaleX, m_userScaleY;
 724     double m_scaleX, m_scaleY;
 725
 726     // Used by SetAxisOrientation() to invert the axes
 727     int m_signX, m_signY;
 728
 729     // bounding and clipping boxes
 730     wxCoord m_minX, m_minY, m_maxX, m_maxY;
 731     wxCoord m_clipX1, m_clipY1, m_clipX2, m_clipY2;
 732
 733     int m_logicalFunction;
 734     int m_backgroundMode;
 735     int m_mappingMode;
 736
 737     // GDI objects
 738     wxPen             m_pen;
 739     wxBrush           m_brush;
 740     wxBrush           m_backgroundBrush;
 741     wxColour          m_textForegroundColour;
 742     wxColour          m_textBackgroundColour;
 743     wxFont            m_font;
 744
 745 #if wxUSE_PALETTE
 746     wxPalette         m_palette;
 747     bool              m_hasCustomPalette;
 748 #endif // wxUSE_PALETTE
 749
 750 private:
 751     DECLARE_NO_COPY_CLASS(wxDCBase)
 752     DECLARE_ABSTRACT_CLASS(wxDCBase)
 753 };
 754
 755 // ----------------------------------------------------------------------------
 756 // now include the declaration of wxDC class
 757 // ----------------------------------------------------------------------------
 758
 759 #if defined(__WXMSW__)
 760     #include "wx/msw/dc.h"
 761 #elif defined(__WXMOTIF__)
 762     #include "wx/motif/dc.h"
 763 #elif defined(__WXGTK__)
 764     #include "wx/gtk/dc.h"
 765 #elif defined(__WXX11__)
 766     #include "wx/x11/dc.h"
 767 #elif defined(__WXMGL__)
 768     #include "wx/mgl/dc.h"
 769 #elif defined(__WXMAC__)
 770     #include "wx/mac/dc.h"
 771 #elif defined(__WXPM__)
 772     #include "wx/os2/dc.h"
 773 #elif defined(__WXSTUBS__)
 774     #include "wx/stubs/dc.h"
 775 #endif
 776
 777 // ----------------------------------------------------------------------------
 778 // helper class: you can use it to temporarily change the DC text colour and
 779 // restore it automatically when the object goes out of scope
 780 // ----------------------------------------------------------------------------
 781
 782 class WXDLLEXPORT wxDCTextColourChanger
 783 {
 784 public:
 785     wxDCTextColourChanger(wxDC& dc) : m_dc(dc), m_colFgOld() { }
 786
 787     ~wxDCTextColourChanger()
 788     {
 789         if ( m_colFgOld.Ok() )
 790             m_dc.SetTextForeground(m_colFgOld);
 791     }
 792
 793     void Set(const wxColour& col)
 794     {
 795         if ( !m_colFgOld.Ok() )
 796             m_colFgOld = m_dc.GetTextForeground();
 797         m_dc.SetTextForeground(col);
 798     }
 799
 800 private:
 801     wxDC& m_dc;
 802
 803     wxColour m_colFgOld;
 804 };
 805
 806 // ----------------------------------------------------------------------------
 807 // another small helper class: sets the clipping region in its ctor and
 808 // destroys it in the dtor
 809 // ----------------------------------------------------------------------------
 810
 811 class WXDLLEXPORT wxDCClipper
 812 {
 813 public:
 814     wxDCClipper(wxDC& dc, const wxRect& r) : m_dc(dc)
 815         { dc.SetClippingRegion(r.x, r.y, r.width, r.height); }
 816     wxDCClipper(wxDC& dc, wxCoord x, wxCoord y, wxCoord w, wxCoord h) : m_dc(dc)
 817         { dc.SetClippingRegion(x, y, w, h); }
 818
 819     ~wxDCClipper() { m_dc.DestroyClippingRegion(); }
 820
 821 private:
 822     wxDC& m_dc;
 823 };
 824
 825 #endif
 826     // _WX_DC_H_BASE_