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) wxWidgets team
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_DC_H_BASE_
  13 #define _WX_DC_H_BASE_
  14
  15 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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/bitmap.h"          // for wxNullBitmap
  29 #include "wx/brush.h"
  30 #include "wx/pen.h"
  31 #include "wx/palette.h"
  32 #include "wx/list.h"            // we use wxList in inline functions
  33 #include "wx/dynarray.h"
  34
  35 class WXDLLEXPORT wxDC;
  36 class WXDLLEXPORT wxDCBase;
  37
  38 class WXDLLEXPORT wxDrawObject
  39 {
  40 public:
  41
  42     wxDrawObject()
  43         : m_isBBoxValid(false)
  44         , m_minX(0), m_minY(0), m_maxX(0), m_maxY(0)
  45     { }
  46
  47     virtual ~wxDrawObject() { }
  48
  49     virtual void Draw(wxDCBase&) const { }
  50
  51     virtual void CalcBoundingBox(wxCoord x, wxCoord y)
  52     {
  53       if ( m_isBBoxValid )
  54       {
  55          if ( x < m_minX ) m_minX = x;
  56          if ( y < m_minY ) m_minY = y;
  57          if ( x > m_maxX ) m_maxX = x;
  58          if ( y > m_maxY ) m_maxY = y;
  59       }
  60       else
  61       {
  62          m_isBBoxValid = true;
  63
  64          m_minX = x;
  65          m_minY = y;
  66          m_maxX = x;
  67          m_maxY = y;
  68       }
  69     }
  70
  71     void ResetBoundingBox()
  72     {
  73         m_isBBoxValid = false;
  74
  75         m_minX = m_maxX = m_minY = m_maxY = 0;
  76     }
  77
  78     // Get the final bounding box of the PostScript or Metafile picture.
  79
  80     wxCoord MinX() const { return m_minX; }
  81     wxCoord MaxX() const { return m_maxX; }
  82     wxCoord MinY() const { return m_minY; }
  83     wxCoord MaxY() const { return m_maxY; }
  84
  85     //to define the type of object for derived objects
  86     virtual int GetType()=0;
  87
  88 protected:
  89     //for boundingbox calculation
  90     bool m_isBBoxValid:1;
  91     //for boundingbox calculation
  92     wxCoord m_minX, m_minY, m_maxX, m_maxY;
  93 };
  94
  95 // ---------------------------------------------------------------------------
  96 // global variables
  97 // ---------------------------------------------------------------------------
  98
  99 WXDLLEXPORT_DATA(extern int) wxPageNumber;
 100
 101 // ---------------------------------------------------------------------------
 102 // wxDC is the device context - object on which any drawing is done
 103 // ---------------------------------------------------------------------------
 104
 105 class WXDLLEXPORT wxDCBase : public wxObject
 106 {
 107 public:
 108     wxDCBase()
 109         : m_colour(wxColourDisplay())
 110         , m_ok(true)
 111         , m_clipping(false)
 112         , m_isInteractive(0)
 113         , m_isBBoxValid(false)
 114         , m_logicalOriginX(0), m_logicalOriginY(0)
 115         , m_deviceOriginX(0), m_deviceOriginY(0)
 116         , m_logicalScaleX(1.0), m_logicalScaleY(1.0)
 117         , m_userScaleX(1.0), m_userScaleY(1.0)
 118         , m_scaleX(1.0), m_scaleY(1.0)
 119         , m_signX(1), m_signY(1)
 120         , m_minX(0), m_minY(0), m_maxX(0), m_maxY(0)
 121         , m_clipX1(0), m_clipY1(0), m_clipX2(0), m_clipY2(0)
 122         , m_logicalFunction(wxCOPY)
 123         , m_backgroundMode(wxTRANSPARENT)
 124         , m_mappingMode(wxMM_TEXT)
 125         , m_pen()
 126         , m_brush()
 127         , m_backgroundBrush(*wxTRANSPARENT_BRUSH)
 128         , m_textForegroundColour(*wxBLACK)
 129         , m_textBackgroundColour(*wxWHITE)
 130         , m_font()
 131 #if wxUSE_PALETTE
 132         , m_palette()
 133         , m_hasCustomPalette(false)
 134 #endif // wxUSE_PALETTE
 135     {
 136         ResetBoundingBox();
 137         ResetClipping();
 138     }
 139
 140     ~wxDCBase() { }
 141
 142     virtual void BeginDrawing() { }
 143     virtual void EndDrawing() { }
 144
 145     // graphic primitives
 146     // ------------------
 147
 148     virtual void DrawObject(wxDrawObject* drawobject)
 149     {
 150         drawobject->Draw(*this);
 151         CalcBoundingBox(drawobject->MinX(),drawobject->MinY());
 152         CalcBoundingBox(drawobject->MaxX(),drawobject->MaxY());
 153     }
 154
 155     bool FloodFill(wxCoord x, wxCoord y, const wxColour& col,
 156                    int style = wxFLOOD_SURFACE)
 157         { return DoFloodFill(x, y, col, style); }
 158     bool FloodFill(const wxPoint& pt, const wxColour& col,
 159                    int style = wxFLOOD_SURFACE)
 160         { return DoFloodFill(pt.x, pt.y, col, style); }
 161
 162     bool GetPixel(wxCoord x, wxCoord y, wxColour *col) const
 163         { return DoGetPixel(x, y, col); }
 164     bool GetPixel(const wxPoint& pt, wxColour *col) const
 165         { return DoGetPixel(pt.x, pt.y, col); }
 166
 167     void DrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
 168         { DoDrawLine(x1, y1, x2, y2); }
 169     void DrawLine(const wxPoint& pt1, const wxPoint& pt2)
 170         { DoDrawLine(pt1.x, pt1.y, pt2.x, pt2.y); }
 171
 172     void CrossHair(wxCoord x, wxCoord y)
 173         { DoCrossHair(x, y); }
 174     void CrossHair(const wxPoint& pt)
 175         { DoCrossHair(pt.x, pt.y); }
 176
 177     void DrawArc(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2,
 178                  wxCoord xc, wxCoord yc)
 179         { DoDrawArc(x1, y1, x2, y2, xc, yc); }
 180     void DrawArc(const wxPoint& pt1, const wxPoint& pt2, const wxPoint& centre)
 181         { DoDrawArc(pt1.x, pt1.y, pt2.x, pt2.y, centre.x, centre.y); }
 182
 183     void DrawCheckMark(wxCoord x, wxCoord y,
 184                        wxCoord width, wxCoord height)
 185         { DoDrawCheckMark(x, y, width, height); }
 186     void DrawCheckMark(const wxRect& rect)
 187         { DoDrawCheckMark(rect.x, rect.y, rect.width, rect.height); }
 188
 189     void DrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 190                          double sa, double ea)
 191         { DoDrawEllipticArc(x, y, w, h, sa, ea); }
 192     void DrawEllipticArc(const wxPoint& pt, const wxSize& sz,
 193                          double sa, double ea)
 194         { DoDrawEllipticArc(pt.x, pt.y, sz.x, sz.y, sa, ea); }
 195
 196     void DrawPoint(wxCoord x, wxCoord y)
 197         { DoDrawPoint(x, y); }
 198     void DrawPoint(const wxPoint& pt)
 199         { DoDrawPoint(pt.x, pt.y); }
 200
 201     void DrawLines(int n, wxPoint points[],
 202                    wxCoord xoffset = 0, wxCoord yoffset = 0)
 203         { DoDrawLines(n, points, xoffset, yoffset); }
 204     void DrawLines(const wxList *list,
 205                    wxCoord xoffset = 0, wxCoord yoffset = 0);
 206
 207     void DrawPolygon(int n, wxPoint points[],
 208                      wxCoord xoffset = 0, wxCoord yoffset = 0,
 209                      int fillStyle = wxODDEVEN_RULE)
 210         { DoDrawPolygon(n, points, xoffset, yoffset, fillStyle); }
 211
 212     void DrawPolygon(const wxList *list,
 213                      wxCoord xoffset = 0, wxCoord yoffset = 0,
 214                      int fillStyle = wxODDEVEN_RULE);
 215
 216     void DrawPolyPolygon(int n, int count[], wxPoint points[],
 217                          wxCoord xoffset = 0, wxCoord yoffset = 0,
 218                          int fillStyle = wxODDEVEN_RULE)
 219         { DoDrawPolyPolygon(n, count, points, xoffset, yoffset, fillStyle); }
 220
 221     void DrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 222         { DoDrawRectangle(x, y, width, height); }
 223     void DrawRectangle(const wxPoint& pt, const wxSize& sz)
 224         { DoDrawRectangle(pt.x, pt.y, sz.x, sz.y); }
 225     void DrawRectangle(const wxRect& rect)
 226         { DoDrawRectangle(rect.x, rect.y, rect.width, rect.height); }
 227
 228     void DrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height,
 229                               double radius)
 230         { DoDrawRoundedRectangle(x, y, width, height, radius); }
 231     void DrawRoundedRectangle(const wxPoint& pt, const wxSize& sz,
 232                              double radius)
 233         { DoDrawRoundedRectangle(pt.x, pt.y, sz.x, sz.y, radius); }
 234     void DrawRoundedRectangle(const wxRect& r, double radius)
 235         { DoDrawRoundedRectangle(r.x, r.y, r.width, r.height, radius); }
 236
 237     void DrawCircle(wxCoord x, wxCoord y, wxCoord radius)
 238         { DoDrawEllipse(x - radius, y - radius, 2*radius, 2*radius); }
 239     void DrawCircle(const wxPoint& pt, wxCoord radius)
 240         { DrawCircle(pt.x, pt.y, radius); }
 241
 242     void DrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 243         { DoDrawEllipse(x, y, width, height); }
 244     void DrawEllipse(const wxPoint& pt, const wxSize& sz)
 245         { DoDrawEllipse(pt.x, pt.y, sz.x, sz.y); }
 246     void DrawEllipse(const wxRect& rect)
 247         { DoDrawEllipse(rect.x, rect.y, rect.width, rect.height); }
 248
 249     void DrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 250         { DoDrawIcon(icon, x, y); }
 251     void DrawIcon(const wxIcon& icon, const wxPoint& pt)
 252         { DoDrawIcon(icon, pt.x, pt.y); }
 253
 254     void DrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 255                     bool useMask = false)
 256         { DoDrawBitmap(bmp, x, y, useMask); }
 257     void DrawBitmap(const wxBitmap &bmp, const wxPoint& pt,
 258                     bool useMask = false)
 259         { DoDrawBitmap(bmp, pt.x, pt.y, useMask); }
 260
 261     void DrawText(const wxString& text, wxCoord x, wxCoord y)
 262         { DoDrawText(text, x, y); }
 263     void DrawText(const wxString& text, const wxPoint& pt)
 264         { DoDrawText(text, pt.x, pt.y); }
 265
 266     void DrawRotatedText(const wxString& text, wxCoord x, wxCoord y, double angle)
 267         { DoDrawRotatedText(text, x, y, angle); }
 268     void DrawRotatedText(const wxString& text, const wxPoint& pt, double angle)
 269         { DoDrawRotatedText(text, pt.x, pt.y, angle); }
 270
 271     // this version puts both optional bitmap and the text into the given
 272     // rectangle and aligns is as specified by alignment parameter; it also
 273     // will emphasize the character with the given index if it is != -1 and
 274     // return the bounding rectangle if required
 275     virtual void DrawLabel(const wxString& text,
 276                            const wxBitmap& image,
 277                            const wxRect& rect,
 278                            int alignment = wxALIGN_LEFT | wxALIGN_TOP,
 279                            int indexAccel = -1,
 280                            wxRect *rectBounding = NULL);
 281
 282     void DrawLabel(const wxString& text, const wxRect& rect,
 283                    int alignment = wxALIGN_LEFT | wxALIGN_TOP,
 284                    int indexAccel = -1)
 285         { DrawLabel(text, wxNullBitmap, rect, alignment, indexAccel); }
 286
 287     bool Blit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 288               wxDC *source, wxCoord xsrc, wxCoord ysrc,
 289               int rop = wxCOPY, bool useMask = false, wxCoord xsrcMask = wxDefaultCoord, wxCoord ysrcMask = wxDefaultCoord)
 290     {
 291         return DoBlit(xdest, ydest, width, height,
 292                       source, xsrc, ysrc, rop, useMask, xsrcMask, ysrcMask);
 293     }
 294     bool Blit(const wxPoint& destPt, const wxSize& sz,
 295               wxDC *source, const wxPoint& srcPt,
 296               int rop = wxCOPY, bool useMask = false, const wxPoint& srcPtMask = wxDefaultPosition)
 297     {
 298         return DoBlit(destPt.x, destPt.y, sz.x, sz.y,
 299                       source, srcPt.x, srcPt.y, rop, useMask, srcPtMask.x, srcPtMask.y);
 300     }
 301
 302 #if wxUSE_SPLINES
 303     // TODO: this API needs fixing (wxPointList, why (!const) "wxList *"?)
 304     void DrawSpline(wxCoord x1, wxCoord y1,
 305                     wxCoord x2, wxCoord y2,
 306                     wxCoord x3, wxCoord y3);
 307     void DrawSpline(int n, wxPoint points[]);
 308
 309     void DrawSpline(wxList *points) { DoDrawSpline(points); }
 310 #endif // wxUSE_SPLINES
 311
 312     // Eventually we will have wxUSE_GENERIC_DRAWELLIPSE
 313 #ifdef __WXWINCE__
 314     //! Generic method to draw ellipses, circles and arcs with current pen and brush.
 315     /*! \param x Upper left corner of bounding box.
 316      *  \param y Upper left corner of bounding box.
 317      *  \param w Width of bounding box.
 318      *  \param h Height of bounding box.
 319      *  \param sa Starting angle of arc
 320      *            (counterclockwise, start at 3 o'clock, 360 is full circle).
 321      *  \param ea Ending angle of arc.
 322      *  \param angle Rotation angle, the Arc will be rotated after
 323      *               calculating begin and end.
 324      */
 325     void DrawEllipticArcRot( wxCoord x, wxCoord y,
 326                              wxCoord width, wxCoord height,
 327                              double sa = 0, double ea = 0, double angle = 0 )
 328     { DoDrawEllipticArcRot( x, y, width, height, sa, ea, angle ); }
 329
 330     void DrawEllipticArcRot( const wxPoint& pt,
 331                              const wxSize& sz,
 332                              double sa = 0, double ea = 0, double angle = 0 )
 333     { DoDrawEllipticArcRot( pt.x, pt.y, sz.x, sz.y, sa, ea, angle ); }
 334
 335     void DrawEllipticArcRot( const wxRect& rect,
 336                              double sa = 0, double ea = 0, double angle = 0 )
 337     { DoDrawEllipticArcRot( rect.x, rect.y, rect.width, rect.height, sa, ea, angle ); }
 338
 339     virtual void DoDrawEllipticArcRot( wxCoord x, wxCoord y,
 340                                        wxCoord w, wxCoord h,
 341                                        double sa = 0, double ea = 0, double angle = 0 );
 342
 343     //! Rotates points around center.
 344     /*! This is a quite straight method, it calculates in pixels
 345      *  and so it produces rounding errors.
 346      *  \param points The points inside will be rotated.
 347      *  \param angle Rotating angle (counterclockwise, start at 3 o'clock, 360 is full circle).
 348      *  \param center Center of rotation.
 349      */
 350     void Rotate( wxList* points, double angle, wxPoint center = wxPoint() );
 351
 352     // used by DrawEllipticArcRot
 353     // Careful: wxList gets filled with points you have to delete later.
 354     void CalculateEllipticPoints( wxList* points,
 355                                   wxCoord xStart, wxCoord yStart,
 356                                   wxCoord w, wxCoord h,
 357                                   double sa, double ea );
 358 #endif
 359
 360     // global DC operations
 361     // --------------------
 362
 363     virtual void Clear() = 0;
 364
 365     virtual bool StartDoc(const wxString& WXUNUSED(message)) { return true; }
 366     virtual void EndDoc() { }
 367
 368     virtual void StartPage() { }
 369     virtual void EndPage() { }
 370
 371     // set objects to use for drawing
 372     // ------------------------------
 373
 374     virtual void SetFont(const wxFont& font) = 0;
 375     virtual void SetPen(const wxPen& pen) = 0;
 376     virtual void SetBrush(const wxBrush& brush) = 0;
 377     virtual void SetBackground(const wxBrush& brush) = 0;
 378     virtual void SetBackgroundMode(int mode) = 0;
 379 #if wxUSE_PALETTE
 380     virtual void SetPalette(const wxPalette& palette) = 0;
 381 #endif // wxUSE_PALETTE
 382
 383     // clipping region
 384     // ---------------
 385
 386     void SetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 387         { DoSetClippingRegion(x, y, width, height); }
 388     void SetClippingRegion(const wxPoint& pt, const wxSize& sz)
 389         { DoSetClippingRegion(pt.x, pt.y, sz.x, sz.y); }
 390     void SetClippingRegion(const wxRect& rect)
 391         { DoSetClippingRegion(rect.x, rect.y, rect.width, rect.height); }
 392     void SetClippingRegion(const wxRegion& region)
 393         { DoSetClippingRegionAsRegion(region); }
 394
 395     virtual void DestroyClippingRegion() { ResetClipping(); }
 396
 397     void GetClippingBox(wxCoord *x, wxCoord *y, wxCoord *w, wxCoord *h) const
 398         { DoGetClippingBox(x, y, w, h); }
 399     void GetClippingBox(wxRect& rect) const
 400         {
 401           DoGetClippingBox(&rect.x, &rect.y, &rect.width, &rect.height);
 402         }
 403
 404     // text extent
 405     // -----------
 406
 407     virtual wxCoord GetCharHeight() const = 0;
 408     virtual wxCoord GetCharWidth() const = 0;
 409
 410     // only works for single line strings
 411     void GetTextExtent(const wxString& string,
 412                        wxCoord *x, wxCoord *y,
 413                        wxCoord *descent = NULL,
 414                        wxCoord *externalLeading = NULL,
 415                        wxFont *theFont = NULL) const
 416         { DoGetTextExtent(string, x, y, descent, externalLeading, theFont); }
 417
 418     // works for single as well as multi-line strings
 419     virtual void GetMultiLineTextExtent(const wxString& text,
 420                                         wxCoord *width,
 421                                         wxCoord *height,
 422                                         wxCoord *heightLine = NULL,
 423                                         wxFont *font = NULL);
 424
 425     // Measure cumulative width of text after each character
 426     bool GetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 427         { return DoGetPartialTextExtents(text, widths); }
 428
 429
 430     // size and resolution
 431     // -------------------
 432
 433     // in device units
 434     void GetSize(int *width, int *height) const
 435         { DoGetSize(width, height); }
 436     wxSize GetSize() const
 437     {
 438         int w, h;
 439         DoGetSize(&w, &h);
 440
 441         return wxSize(w, h);
 442     }
 443
 444     // in mm
 445     void GetSizeMM(int* width, int* height) const
 446         { DoGetSizeMM(width, height); }
 447     wxSize GetSizeMM() const
 448     {
 449         int w, h;
 450         DoGetSizeMM(&w, &h);
 451
 452         return wxSize(w, h);
 453     }
 454
 455     // coordinates conversions
 456     // -----------------------
 457
 458     // This group of functions does actual conversion of the input, as you'd
 459     // expect.
 460     wxCoord DeviceToLogicalX(wxCoord x) const;
 461     wxCoord DeviceToLogicalY(wxCoord y) const;
 462     wxCoord DeviceToLogicalXRel(wxCoord x) const;
 463     wxCoord DeviceToLogicalYRel(wxCoord y) const;
 464     wxCoord LogicalToDeviceX(wxCoord x) const;
 465     wxCoord LogicalToDeviceY(wxCoord y) const;
 466     wxCoord LogicalToDeviceXRel(wxCoord x) const;
 467     wxCoord LogicalToDeviceYRel(wxCoord y) const;
 468
 469     // query DC capabilities
 470     // ---------------------
 471
 472     virtual bool CanDrawBitmap() const = 0;
 473     virtual bool CanGetTextExtent() const = 0;
 474
 475     // colour depth
 476     virtual int GetDepth() const = 0;
 477
 478     // Resolution in Pixels per inch
 479     virtual wxSize GetPPI() const = 0;
 480
 481     virtual bool Ok() const { return m_ok; }
 482
 483     // accessors and setters
 484     // ---------------------
 485
 486     int GetBackgroundMode() const { return m_backgroundMode; }
 487     const wxBrush&  GetBackground() const { return m_backgroundBrush; }
 488     const wxBrush&  GetBrush() const { return m_brush; }
 489     const wxFont&   GetFont() const { return m_font; }
 490     const wxPen&    GetPen() const { return m_pen; }
 491
 492     const wxColour& GetTextForeground() const { return m_textForegroundColour; }
 493     const wxColour& GetTextBackground() const { return m_textBackgroundColour; }
 494     virtual void SetTextForeground(const wxColour& colour)
 495         { m_textForegroundColour = colour; }
 496     virtual void SetTextBackground(const wxColour& colour)
 497         { m_textBackgroundColour = colour; }
 498
 499     int GetMapMode() const { return m_mappingMode; }
 500     virtual void SetMapMode(int mode) = 0;
 501
 502     virtual void GetUserScale(double *x, double *y) const
 503     {
 504         if ( x ) *x = m_userScaleX;
 505         if ( y ) *y = m_userScaleY;
 506     }
 507     virtual void SetUserScale(double x, double y) = 0;
 508
 509     virtual void GetLogicalScale(double *x, double *y)
 510     {
 511         if ( x ) *x = m_logicalScaleX;
 512         if ( y ) *y = m_logicalScaleY;
 513     }
 514     virtual void SetLogicalScale(double x, double y)
 515     {
 516         m_logicalScaleX = x;
 517         m_logicalScaleY = y;
 518     }
 519
 520     void GetLogicalOrigin(wxCoord *x, wxCoord *y) const
 521         { DoGetLogicalOrigin(x, y); }
 522     wxPoint GetLogicalOrigin() const
 523         { wxCoord x, y; DoGetLogicalOrigin(&x, &y); return wxPoint(x, y); }
 524     virtual void SetLogicalOrigin(wxCoord x, wxCoord y) = 0;
 525
 526     void GetDeviceOrigin(wxCoord *x, wxCoord *y) const
 527         { DoGetDeviceOrigin(x, y); }
 528     wxPoint GetDeviceOrigin() const
 529         { wxCoord x, y; DoGetDeviceOrigin(&x, &y); return wxPoint(x, y); }
 530     virtual void SetDeviceOrigin(wxCoord x, wxCoord y) = 0;
 531
 532     virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp) = 0;
 533
 534     int GetLogicalFunction() const { return m_logicalFunction; }
 535     virtual void SetLogicalFunction(int function) = 0;
 536
 537     // Sometimes we need to override optimization, e.g. if other software is
 538     // drawing onto our surface and we can't be sure of who's done what.
 539     //
 540     // FIXME: is this (still) used?
 541     virtual void SetOptimization(bool WXUNUSED(opt)) { }
 542     virtual bool GetOptimization() { return false; }
 543
 544     // bounding box
 545     // ------------
 546
 547     virtual void CalcBoundingBox(wxCoord x, wxCoord y)
 548     {
 549       if ( m_isBBoxValid )
 550       {
 551          if ( x < m_minX ) m_minX = x;
 552          if ( y < m_minY ) m_minY = y;
 553          if ( x > m_maxX ) m_maxX = x;
 554          if ( y > m_maxY ) m_maxY = y;
 555       }
 556       else
 557       {
 558          m_isBBoxValid = true;
 559
 560          m_minX = x;
 561          m_minY = y;
 562          m_maxX = x;
 563          m_maxY = y;
 564       }
 565     }
 566
 567     void ResetBoundingBox()
 568     {
 569         m_isBBoxValid = false;
 570
 571         m_minX = m_maxX = m_minY = m_maxY = 0;
 572     }
 573
 574     // Get the final bounding box of the PostScript or Metafile picture.
 575     wxCoord MinX() const { return m_minX; }
 576     wxCoord MaxX() const { return m_maxX; }
 577     wxCoord MinY() const { return m_minY; }
 578     wxCoord MaxY() const { return m_maxY; }
 579
 580     // misc old functions
 581     // ------------------
 582
 583     // for compatibility with the old code when wxCoord was long everywhere
 584     void GetTextExtent(const wxString& string,
 585                        long *x, long *y,
 586                        long *descent = NULL,
 587                        long *externalLeading = NULL,
 588                        wxFont *theFont = NULL) const
 589     {
 590         wxCoord x2, y2, descent2, externalLeading2;
 591         DoGetTextExtent(string, &x2, &y2,
 592                         &descent2, &externalLeading2,
 593                         theFont);
 594         if ( x )
 595             *x = x2;
 596         if ( y )
 597             *y = y2;
 598         if ( descent )
 599             *descent = descent2;
 600         if ( externalLeading )
 601             *externalLeading = externalLeading2;
 602     }
 603
 604     void GetLogicalOrigin(long *x, long *y) const
 605     {
 606         wxCoord x2, y2;
 607         DoGetLogicalOrigin(&x2, &y2);
 608         if ( x )
 609             *x = x2;
 610         if ( y )
 611             *y = y2;
 612     }
 613
 614     void GetDeviceOrigin(long *x, long *y) const
 615     {
 616         wxCoord x2, y2;
 617         DoGetDeviceOrigin(&x2, &y2);
 618         if ( x )
 619             *x = x2;
 620         if ( y )
 621             *y = y2;
 622     }
 623     void GetClippingBox(long *x, long *y, long *w, long *h) const
 624     {
 625         wxCoord xx,yy,ww,hh;
 626         DoGetClippingBox(&xx, &yy, &ww, &hh);
 627         if (x) *x = xx;
 628         if (y) *y = yy;
 629         if (w) *w = ww;
 630         if (h) *h = hh;
 631     }
 632
 633 protected:
 634     // the pure virtual functions which should be implemented by wxDC
 635     virtual bool DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
 636                              int style = wxFLOOD_SURFACE) = 0;
 637
 638     virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const = 0;
 639
 640     virtual void DoDrawPoint(wxCoord x, wxCoord y) = 0;
 641     virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2) = 0;
 642
 643     virtual void DoDrawArc(wxCoord x1, wxCoord y1,
 644                            wxCoord x2, wxCoord y2,
 645                            wxCoord xc, wxCoord yc) = 0;
 646     virtual void DoDrawCheckMark(wxCoord x, wxCoord y,
 647                                  wxCoord width, wxCoord height);
 648     virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 649                                    double sa, double ea) = 0;
 650
 651     virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height) = 0;
 652     virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 653                                         wxCoord width, wxCoord height,
 654                                         double radius) = 0;
 655     virtual void DoDrawEllipse(wxCoord x, wxCoord y,
 656                                wxCoord width, wxCoord height) = 0;
 657
 658     virtual void DoCrossHair(wxCoord x, wxCoord y) = 0;
 659
 660     virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y) = 0;
 661     virtual void DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 662                               bool useMask = false) = 0;
 663
 664     virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y) = 0;
 665     virtual void DoDrawRotatedText(const wxString& text,
 666                                    wxCoord x, wxCoord y, double angle) = 0;
 667
 668     virtual bool DoBlit(wxCoord xdest, wxCoord ydest,
 669                         wxCoord width, wxCoord height,
 670                         wxDC *source, wxCoord xsrc, wxCoord ysrc,
 671                         int rop = wxCOPY, bool useMask = false, wxCoord xsrcMask = wxDefaultCoord, wxCoord ysrcMask = wxDefaultCoord) = 0;
 672
 673     virtual void DoGetSize(int *width, int *height) const = 0;
 674     virtual void DoGetSizeMM(int* width, int* height) const = 0;
 675
 676     virtual void DoDrawLines(int n, wxPoint points[],
 677                              wxCoord xoffset, wxCoord yoffset) = 0;
 678     virtual void DoDrawPolygon(int n, wxPoint points[],
 679                                wxCoord xoffset, wxCoord yoffset,
 680                                int fillStyle = wxODDEVEN_RULE) = 0;
 681     virtual void DoDrawPolyPolygon(int n, int count[], wxPoint points[],
 682                                wxCoord xoffset, wxCoord yoffset,
 683                                int fillStyle);
 684
 685     virtual void DoSetClippingRegionAsRegion(const wxRegion& region) = 0;
 686     virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
 687                                      wxCoord width, wxCoord height) = 0;
 688
 689     // FIXME are these functions really different?
 690     virtual void DoGetClippingRegion(wxCoord *x, wxCoord *y,
 691                                      wxCoord *w, wxCoord *h)
 692         { DoGetClippingBox(x, y, w, h); }
 693     virtual void DoGetClippingBox(wxCoord *x, wxCoord *y,
 694                                   wxCoord *w, wxCoord *h) const
 695     {
 696         if ( x )
 697             *x = m_clipX1;
 698         if ( y )
 699             *y = m_clipY1;
 700         if ( w )
 701             *w = m_clipX2 - m_clipX1;
 702         if ( h )
 703             *h = m_clipY2 - m_clipY1;
 704     }
 705
 706     virtual void DoGetLogicalOrigin(wxCoord *x, wxCoord *y) const
 707     {
 708         if ( x ) *x = m_logicalOriginX;
 709         if ( y ) *y = m_logicalOriginY;
 710     }
 711
 712     virtual void DoGetDeviceOrigin(wxCoord *x, wxCoord *y) const
 713     {
 714         if ( x ) *x = m_deviceOriginX;
 715         if ( y ) *y = m_deviceOriginY;
 716     }
 717
 718     virtual void DoGetTextExtent(const wxString& string,
 719                                  wxCoord *x, wxCoord *y,
 720                                  wxCoord *descent = NULL,
 721                                  wxCoord *externalLeading = NULL,
 722                                  wxFont *theFont = NULL) const = 0;
 723
 724     virtual bool DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const;
 725
 726 #if wxUSE_SPLINES
 727     virtual void DoDrawSpline(wxList *points);
 728 #endif
 729
 730 protected:
 731     // unset clipping variables (after clipping region was destroyed)
 732     void ResetClipping()
 733     {
 734         m_clipping = false;
 735
 736         m_clipX1 = m_clipX2 = m_clipY1 = m_clipY2 = 0;
 737     }
 738
 739     // flags
 740     bool m_colour:1;
 741     bool m_ok:1;
 742     bool m_clipping:1;
 743     bool m_isInteractive:1;
 744     bool m_isBBoxValid:1;
 745
 746     // coordinate system variables
 747
 748     // TODO short descriptions of what exactly they are would be nice...
 749
 750     wxCoord m_logicalOriginX, m_logicalOriginY;
 751     wxCoord m_deviceOriginX, m_deviceOriginY;
 752
 753     double m_logicalScaleX, m_logicalScaleY;
 754     double m_userScaleX, m_userScaleY;
 755     double m_scaleX, m_scaleY;
 756
 757     // Used by SetAxisOrientation() to invert the axes
 758     int m_signX, m_signY;
 759
 760     // bounding and clipping boxes
 761     wxCoord m_minX, m_minY, m_maxX, m_maxY;
 762     wxCoord m_clipX1, m_clipY1, m_clipX2, m_clipY2;
 763
 764     int m_logicalFunction;
 765     int m_backgroundMode;
 766     int m_mappingMode;
 767
 768     // GDI objects
 769     wxPen             m_pen;
 770     wxBrush           m_brush;
 771     wxBrush           m_backgroundBrush;
 772     wxColour          m_textForegroundColour;
 773     wxColour          m_textBackgroundColour;
 774     wxFont            m_font;
 775
 776 #if wxUSE_PALETTE
 777     wxPalette         m_palette;
 778     bool              m_hasCustomPalette;
 779 #endif // wxUSE_PALETTE
 780
 781 private:
 782     DECLARE_NO_COPY_CLASS(wxDCBase)
 783     DECLARE_ABSTRACT_CLASS(wxDCBase)
 784 };
 785
 786 // ----------------------------------------------------------------------------
 787 // now include the declaration of wxDC class
 788 // ----------------------------------------------------------------------------
 789
 790 #if defined(__PALMOS__)
 791     #include "wx/palmos/dc.h"
 792 #elif defined(__WXMSW__)
 793     #include "wx/msw/dc.h"
 794 #elif defined(__WXMOTIF__)
 795     #include "wx/motif/dc.h"
 796 #elif defined(__WXGTK__)
 797     #include "wx/gtk/dc.h"
 798 #elif defined(__WXX11__)
 799     #include "wx/x11/dc.h"
 800 #elif defined(__WXMGL__)
 801     #include "wx/mgl/dc.h"
 802 #elif defined(__WXMAC__)
 803     #include "wx/mac/dc.h"
 804 #elif defined(__WXCOCOA__)
 805     #include "wx/cocoa/dc.h"
 806 #elif defined(__WXPM__)
 807     #include "wx/os2/dc.h"
 808 #endif
 809
 810 // ----------------------------------------------------------------------------
 811 // helper class: you can use it to temporarily change the DC text colour and
 812 // restore it automatically when the object goes out of scope
 813 // ----------------------------------------------------------------------------
 814
 815 class WXDLLEXPORT wxDCTextColourChanger
 816 {
 817 public:
 818     wxDCTextColourChanger(wxDC& dc) : m_dc(dc), m_colFgOld() { }
 819
 820     ~wxDCTextColourChanger()
 821     {
 822         if ( m_colFgOld.Ok() )
 823             m_dc.SetTextForeground(m_colFgOld);
 824     }
 825
 826     void Set(const wxColour& col)
 827     {
 828         if ( !m_colFgOld.Ok() )
 829             m_colFgOld = m_dc.GetTextForeground();
 830         m_dc.SetTextForeground(col);
 831     }
 832
 833 private:
 834     wxDC& m_dc;
 835
 836     wxColour m_colFgOld;
 837
 838     DECLARE_NO_COPY_CLASS(wxDCTextColourChanger)
 839 };
 840
 841 // ----------------------------------------------------------------------------
 842 // another small helper class: sets the clipping region in its ctor and
 843 // destroys it in the dtor
 844 // ----------------------------------------------------------------------------
 845
 846 class WXDLLEXPORT wxDCClipper
 847 {
 848 public:
 849     wxDCClipper(wxDC& dc, const wxRect& r) : m_dc(dc)
 850         { dc.SetClippingRegion(r.x, r.y, r.width, r.height); }
 851     wxDCClipper(wxDC& dc, wxCoord x, wxCoord y, wxCoord w, wxCoord h) : m_dc(dc)
 852         { dc.SetClippingRegion(x, y, w, h); }
 853
 854     ~wxDCClipper() { m_dc.DestroyClippingRegion(); }
 855
 856 private:
 857     wxDC& m_dc;
 858
 859     DECLARE_NO_COPY_CLASS(wxDCClipper)
 860 };
 861
 862 #endif
 863     // _WX_DC_H_BASE_