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 #include "wx/math.h"
  35
  36 class WXDLLEXPORT wxDC;
  37 class WXDLLEXPORT wxDCBase;
  38
  39 class WXDLLEXPORT wxDrawObject
  40 {
  41 public:
  42
  43     wxDrawObject()
  44         : m_isBBoxValid(false)
  45         , m_minX(0), m_minY(0), m_maxX(0), m_maxY(0)
  46     { }
  47
  48     virtual ~wxDrawObject() { }
  49
  50     virtual void Draw(wxDCBase&) const { }
  51
  52     virtual void CalcBoundingBox(wxCoord x, wxCoord y)
  53     {
  54       if ( m_isBBoxValid )
  55       {
  56          if ( x < m_minX ) m_minX = x;
  57          if ( y < m_minY ) m_minY = y;
  58          if ( x > m_maxX ) m_maxX = x;
  59          if ( y > m_maxY ) m_maxY = y;
  60       }
  61       else
  62       {
  63          m_isBBoxValid = true;
  64
  65          m_minX = x;
  66          m_minY = y;
  67          m_maxX = x;
  68          m_maxY = y;
  69       }
  70     }
  71
  72     void ResetBoundingBox()
  73     {
  74         m_isBBoxValid = false;
  75
  76         m_minX = m_maxX = m_minY = m_maxY = 0;
  77     }
  78
  79     // Get the final bounding box of the PostScript or Metafile picture.
  80
  81     wxCoord MinX() const { return m_minX; }
  82     wxCoord MaxX() const { return m_maxX; }
  83     wxCoord MinY() const { return m_minY; }
  84     wxCoord MaxY() const { return m_maxY; }
  85
  86     //to define the type of object for derived objects
  87     virtual int GetType()=0;
  88
  89 protected:
  90     //for boundingbox calculation
  91     bool m_isBBoxValid:1;
  92     //for boundingbox calculation
  93     wxCoord m_minX, m_minY, m_maxX, m_maxY;
  94 };
  95
  96 // ---------------------------------------------------------------------------
  97 // global variables
  98 // ---------------------------------------------------------------------------
  99
 100 WXDLLEXPORT_DATA(extern int) wxPageNumber;
 101
 102 // ---------------------------------------------------------------------------
 103 // wxDC is the device context - object on which any drawing is done
 104 // ---------------------------------------------------------------------------
 105
 106 class WXDLLEXPORT wxDCBase : public wxObject
 107 {
 108 public:
 109     wxDCBase()
 110         : m_colour(wxColourDisplay())
 111         , m_ok(true)
 112         , m_clipping(false)
 113         , m_isInteractive(0)
 114         , m_isBBoxValid(false)
 115         , m_logicalOriginX(0), m_logicalOriginY(0)
 116         , m_deviceOriginX(0), m_deviceOriginY(0)
 117         , m_logicalScaleX(1.0), m_logicalScaleY(1.0)
 118         , m_userScaleX(1.0), m_userScaleY(1.0)
 119         , m_scaleX(1.0), m_scaleY(1.0)
 120         , m_signX(1), m_signY(1)
 121         , m_minX(0), m_minY(0), m_maxX(0), m_maxY(0)
 122         , m_clipX1(0), m_clipY1(0), m_clipX2(0), m_clipY2(0)
 123         , m_logicalFunction(wxCOPY)
 124         , m_backgroundMode(wxTRANSPARENT)
 125         , m_mappingMode(wxMM_TEXT)
 126         , m_pen()
 127         , m_brush()
 128         , m_backgroundBrush(*wxTRANSPARENT_BRUSH)
 129         , m_textForegroundColour(*wxBLACK)
 130         , m_textBackgroundColour(*wxWHITE)
 131         , m_font()
 132 #if wxUSE_PALETTE
 133         , m_palette()
 134         , m_hasCustomPalette(false)
 135 #endif // wxUSE_PALETTE
 136     {
 137         ResetBoundingBox();
 138         ResetClipping();
 139     }
 140
 141     ~wxDCBase() { }
 142
 143     virtual void BeginDrawing() { }
 144     virtual void EndDrawing() { }
 145
 146     // graphic primitives
 147     // ------------------
 148
 149     virtual void DrawObject(wxDrawObject* drawobject)
 150     {
 151         drawobject->Draw(*this);
 152         CalcBoundingBox(drawobject->MinX(),drawobject->MinY());
 153         CalcBoundingBox(drawobject->MaxX(),drawobject->MaxY());
 154     }
 155
 156     bool FloodFill(wxCoord x, wxCoord y, const wxColour& col,
 157                    int style = wxFLOOD_SURFACE)
 158         { return DoFloodFill(x, y, col, style); }
 159     bool FloodFill(const wxPoint& pt, const wxColour& col,
 160                    int style = wxFLOOD_SURFACE)
 161         { return DoFloodFill(pt.x, pt.y, col, style); }
 162
 163     bool GetPixel(wxCoord x, wxCoord y, wxColour *col) const
 164         { return DoGetPixel(x, y, col); }
 165     bool GetPixel(const wxPoint& pt, wxColour *col) const
 166         { return DoGetPixel(pt.x, pt.y, col); }
 167
 168     void DrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
 169         { DoDrawLine(x1, y1, x2, y2); }
 170     void DrawLine(const wxPoint& pt1, const wxPoint& pt2)
 171         { DoDrawLine(pt1.x, pt1.y, pt2.x, pt2.y); }
 172
 173     void CrossHair(wxCoord x, wxCoord y)
 174         { DoCrossHair(x, y); }
 175     void CrossHair(const wxPoint& pt)
 176         { DoCrossHair(pt.x, pt.y); }
 177
 178     void DrawArc(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2,
 179                  wxCoord xc, wxCoord yc)
 180         { DoDrawArc(x1, y1, x2, y2, xc, yc); }
 181     void DrawArc(const wxPoint& pt1, const wxPoint& pt2, const wxPoint& centre)
 182         { DoDrawArc(pt1.x, pt1.y, pt2.x, pt2.y, centre.x, centre.y); }
 183
 184     void DrawCheckMark(wxCoord x, wxCoord y,
 185                        wxCoord width, wxCoord height)
 186         { DoDrawCheckMark(x, y, width, height); }
 187     void DrawCheckMark(const wxRect& rect)
 188         { DoDrawCheckMark(rect.x, rect.y, rect.width, rect.height); }
 189
 190     void DrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 191                          double sa, double ea)
 192         { DoDrawEllipticArc(x, y, w, h, sa, ea); }
 193     void DrawEllipticArc(const wxPoint& pt, const wxSize& sz,
 194                          double sa, double ea)
 195         { DoDrawEllipticArc(pt.x, pt.y, sz.x, sz.y, sa, ea); }
 196
 197     void DrawPoint(wxCoord x, wxCoord y)
 198         { DoDrawPoint(x, y); }
 199     void DrawPoint(const wxPoint& pt)
 200         { DoDrawPoint(pt.x, pt.y); }
 201
 202     void DrawLines(int n, wxPoint points[],
 203                    wxCoord xoffset = 0, wxCoord yoffset = 0)
 204         { DoDrawLines(n, points, xoffset, yoffset); }
 205     void DrawLines(const wxList *list,
 206                    wxCoord xoffset = 0, wxCoord yoffset = 0);
 207
 208     void DrawPolygon(int n, wxPoint points[],
 209                      wxCoord xoffset = 0, wxCoord yoffset = 0,
 210                      int fillStyle = wxODDEVEN_RULE)
 211         { DoDrawPolygon(n, points, xoffset, yoffset, fillStyle); }
 212
 213     void DrawPolygon(const wxList *list,
 214                      wxCoord xoffset = 0, wxCoord yoffset = 0,
 215                      int fillStyle = wxODDEVEN_RULE);
 216
 217     void DrawPolyPolygon(int n, int count[], wxPoint points[],
 218                          wxCoord xoffset = 0, wxCoord yoffset = 0,
 219                          int fillStyle = wxODDEVEN_RULE)
 220         { DoDrawPolyPolygon(n, count, points, xoffset, yoffset, fillStyle); }
 221
 222     void DrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 223         { DoDrawRectangle(x, y, width, height); }
 224     void DrawRectangle(const wxPoint& pt, const wxSize& sz)
 225         { DoDrawRectangle(pt.x, pt.y, sz.x, sz.y); }
 226     void DrawRectangle(const wxRect& rect)
 227         { DoDrawRectangle(rect.x, rect.y, rect.width, rect.height); }
 228
 229     void DrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height,
 230                               double radius)
 231         { DoDrawRoundedRectangle(x, y, width, height, radius); }
 232     void DrawRoundedRectangle(const wxPoint& pt, const wxSize& sz,
 233                              double radius)
 234         { DoDrawRoundedRectangle(pt.x, pt.y, sz.x, sz.y, radius); }
 235     void DrawRoundedRectangle(const wxRect& r, double radius)
 236         { DoDrawRoundedRectangle(r.x, r.y, r.width, r.height, radius); }
 237
 238     void DrawCircle(wxCoord x, wxCoord y, wxCoord radius)
 239         { DoDrawEllipse(x - radius, y - radius, 2*radius, 2*radius); }
 240     void DrawCircle(const wxPoint& pt, wxCoord radius)
 241         { DrawCircle(pt.x, pt.y, radius); }
 242
 243     void DrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 244         { DoDrawEllipse(x, y, width, height); }
 245     void DrawEllipse(const wxPoint& pt, const wxSize& sz)
 246         { DoDrawEllipse(pt.x, pt.y, sz.x, sz.y); }
 247     void DrawEllipse(const wxRect& rect)
 248         { DoDrawEllipse(rect.x, rect.y, rect.width, rect.height); }
 249
 250     void DrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 251         { DoDrawIcon(icon, x, y); }
 252     void DrawIcon(const wxIcon& icon, const wxPoint& pt)
 253         { DoDrawIcon(icon, pt.x, pt.y); }
 254
 255     void DrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 256                     bool useMask = false)
 257         { DoDrawBitmap(bmp, x, y, useMask); }
 258     void DrawBitmap(const wxBitmap &bmp, const wxPoint& pt,
 259                     bool useMask = false)
 260         { DoDrawBitmap(bmp, pt.x, pt.y, useMask); }
 261
 262     void DrawText(const wxString& text, wxCoord x, wxCoord y)
 263         { DoDrawText(text, x, y); }
 264     void DrawText(const wxString& text, const wxPoint& pt)
 265         { DoDrawText(text, pt.x, pt.y); }
 266
 267     void DrawRotatedText(const wxString& text, wxCoord x, wxCoord y, double angle)
 268         { DoDrawRotatedText(text, x, y, angle); }
 269     void DrawRotatedText(const wxString& text, const wxPoint& pt, double angle)
 270         { DoDrawRotatedText(text, pt.x, pt.y, angle); }
 271
 272     // this version puts both optional bitmap and the text into the given
 273     // rectangle and aligns is as specified by alignment parameter; it also
 274     // will emphasize the character with the given index if it is != -1 and
 275     // return the bounding rectangle if required
 276     virtual void DrawLabel(const wxString& text,
 277                            const wxBitmap& image,
 278                            const wxRect& rect,
 279                            int alignment = wxALIGN_LEFT | wxALIGN_TOP,
 280                            int indexAccel = -1,
 281                            wxRect *rectBounding = NULL);
 282
 283     void DrawLabel(const wxString& text, const wxRect& rect,
 284                    int alignment = wxALIGN_LEFT | wxALIGN_TOP,
 285                    int indexAccel = -1)
 286         { DrawLabel(text, wxNullBitmap, rect, alignment, indexAccel); }
 287
 288     bool Blit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 289               wxDC *source, wxCoord xsrc, wxCoord ysrc,
 290               int rop = wxCOPY, bool useMask = false, wxCoord xsrcMask = wxDefaultCoord, wxCoord ysrcMask = wxDefaultCoord)
 291     {
 292         return DoBlit(xdest, ydest, width, height,
 293                       source, xsrc, ysrc, rop, useMask, xsrcMask, ysrcMask);
 294     }
 295     bool Blit(const wxPoint& destPt, const wxSize& sz,
 296               wxDC *source, const wxPoint& srcPt,
 297               int rop = wxCOPY, bool useMask = false, const wxPoint& srcPtMask = wxDefaultPosition)
 298     {
 299         return DoBlit(destPt.x, destPt.y, sz.x, sz.y,
 300                       source, srcPt.x, srcPt.y, rop, useMask, srcPtMask.x, srcPtMask.y);
 301     }
 302
 303 #if wxUSE_SPLINES
 304     // TODO: this API needs fixing (wxPointList, why (!const) "wxList *"?)
 305     void DrawSpline(wxCoord x1, wxCoord y1,
 306                     wxCoord x2, wxCoord y2,
 307                     wxCoord x3, wxCoord y3);
 308     void DrawSpline(int n, wxPoint points[]);
 309
 310     void DrawSpline(wxList *points) { DoDrawSpline(points); }
 311 #endif // wxUSE_SPLINES
 312
 313     // Eventually we will have wxUSE_GENERIC_DRAWELLIPSE
 314 #ifdef __WXWINCE__
 315     //! Generic method to draw ellipses, circles and arcs with current pen and brush.
 316     /*! \param x Upper left corner of bounding box.
 317      *  \param y Upper left corner of bounding box.
 318      *  \param w Width of bounding box.
 319      *  \param h Height of bounding box.
 320      *  \param sa Starting angle of arc
 321      *            (counterclockwise, start at 3 o'clock, 360 is full circle).
 322      *  \param ea Ending angle of arc.
 323      *  \param angle Rotation angle, the Arc will be rotated after
 324      *               calculating begin and end.
 325      */
 326     void DrawEllipticArcRot( wxCoord x, wxCoord y,
 327                              wxCoord width, wxCoord height,
 328                              double sa = 0, double ea = 0, double angle = 0 )
 329     { DoDrawEllipticArcRot( x, y, width, height, sa, ea, angle ); }
 330
 331     void DrawEllipticArcRot( const wxPoint& pt,
 332                              const wxSize& sz,
 333                              double sa = 0, double ea = 0, double angle = 0 )
 334     { DoDrawEllipticArcRot( pt.x, pt.y, sz.x, sz.y, sa, ea, angle ); }
 335
 336     void DrawEllipticArcRot( const wxRect& rect,
 337                              double sa = 0, double ea = 0, double angle = 0 )
 338     { DoDrawEllipticArcRot( rect.x, rect.y, rect.width, rect.height, sa, ea, angle ); }
 339
 340     virtual void DoDrawEllipticArcRot( wxCoord x, wxCoord y,
 341                                        wxCoord w, wxCoord h,
 342                                        double sa = 0, double ea = 0, double angle = 0 );
 343
 344     //! Rotates points around center.
 345     /*! This is a quite straight method, it calculates in pixels
 346      *  and so it produces rounding errors.
 347      *  \param points The points inside will be rotated.
 348      *  \param angle Rotating angle (counterclockwise, start at 3 o'clock, 360 is full circle).
 349      *  \param center Center of rotation.
 350      */
 351     void Rotate( wxList* points, double angle, wxPoint center = wxPoint() );
 352
 353     // used by DrawEllipticArcRot
 354     // Careful: wxList gets filled with points you have to delete later.
 355     void CalculateEllipticPoints( wxList* points,
 356                                   wxCoord xStart, wxCoord yStart,
 357                                   wxCoord w, wxCoord h,
 358                                   double sa, double ea );
 359 #endif
 360
 361     // global DC operations
 362     // --------------------
 363
 364     virtual void Clear() = 0;
 365
 366     virtual bool StartDoc(const wxString& WXUNUSED(message)) { return true; }
 367     virtual void EndDoc() { }
 368
 369     virtual void StartPage() { }
 370     virtual void EndPage() { }
 371
 372     // set objects to use for drawing
 373     // ------------------------------
 374
 375     virtual void SetFont(const wxFont& font) = 0;
 376     virtual void SetPen(const wxPen& pen) = 0;
 377     virtual void SetBrush(const wxBrush& brush) = 0;
 378     virtual void SetBackground(const wxBrush& brush) = 0;
 379     virtual void SetBackgroundMode(int mode) = 0;
 380 #if wxUSE_PALETTE
 381     virtual void SetPalette(const wxPalette& palette) = 0;
 382 #endif // wxUSE_PALETTE
 383
 384     // clipping region
 385     // ---------------
 386
 387     void SetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 388         { DoSetClippingRegion(x, y, width, height); }
 389     void SetClippingRegion(const wxPoint& pt, const wxSize& sz)
 390         { DoSetClippingRegion(pt.x, pt.y, sz.x, sz.y); }
 391     void SetClippingRegion(const wxRect& rect)
 392         { DoSetClippingRegion(rect.x, rect.y, rect.width, rect.height); }
 393     void SetClippingRegion(const wxRegion& region)
 394         { DoSetClippingRegionAsRegion(region); }
 395
 396     virtual void DestroyClippingRegion() { ResetClipping(); }
 397
 398     void GetClippingBox(wxCoord *x, wxCoord *y, wxCoord *w, wxCoord *h) const
 399         { DoGetClippingBox(x, y, w, h); }
 400     void GetClippingBox(wxRect& rect) const
 401         {
 402           DoGetClippingBox(&rect.x, &rect.y, &rect.width, &rect.height);
 403         }
 404
 405     // text extent
 406     // -----------
 407
 408     virtual wxCoord GetCharHeight() const = 0;
 409     virtual wxCoord GetCharWidth() const = 0;
 410
 411     // only works for single line strings
 412     void GetTextExtent(const wxString& string,
 413                        wxCoord *x, wxCoord *y,
 414                        wxCoord *descent = NULL,
 415                        wxCoord *externalLeading = NULL,
 416                        wxFont *theFont = NULL) const
 417         { DoGetTextExtent(string, x, y, descent, externalLeading, theFont); }
 418
 419     // works for single as well as multi-line strings
 420     virtual void GetMultiLineTextExtent(const wxString& text,
 421                                         wxCoord *width,
 422                                         wxCoord *height,
 423                                         wxCoord *heightLine = NULL,
 424                                         wxFont *font = NULL);
 425
 426     // Measure cumulative width of text after each character
 427     bool GetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 428         { return DoGetPartialTextExtents(text, widths); }
 429
 430
 431     // size and resolution
 432     // -------------------
 433
 434     // in device units
 435     void GetSize(int *width, int *height) const
 436         { DoGetSize(width, height); }
 437     wxSize GetSize() const
 438     {
 439         int w, h;
 440         DoGetSize(&w, &h);
 441
 442         return wxSize(w, h);
 443     }
 444
 445     // in mm
 446     void GetSizeMM(int* width, int* height) const
 447         { DoGetSizeMM(width, height); }
 448     wxSize GetSizeMM() const
 449     {
 450         int w, h;
 451         DoGetSizeMM(&w, &h);
 452
 453         return wxSize(w, h);
 454     }
 455
 456     // coordinates conversions
 457     // -----------------------
 458
 459     // This group of functions does actual conversion of the input, as you'd
 460     // expect.
 461     wxCoord DeviceToLogicalX(wxCoord x) const;
 462     wxCoord DeviceToLogicalY(wxCoord y) const;
 463     wxCoord DeviceToLogicalXRel(wxCoord x) const;
 464     wxCoord DeviceToLogicalYRel(wxCoord y) const;
 465     wxCoord LogicalToDeviceX(wxCoord x) const;
 466     wxCoord LogicalToDeviceY(wxCoord y) const;
 467     wxCoord LogicalToDeviceXRel(wxCoord x) const;
 468     wxCoord LogicalToDeviceYRel(wxCoord y) const;
 469
 470     // query DC capabilities
 471     // ---------------------
 472
 473     virtual bool CanDrawBitmap() const = 0;
 474     virtual bool CanGetTextExtent() const = 0;
 475
 476     // colour depth
 477     virtual int GetDepth() const = 0;
 478
 479     // Resolution in Pixels per inch
 480     virtual wxSize GetPPI() const = 0;
 481
 482     virtual bool Ok() const { return m_ok; }
 483
 484     // accessors and setters
 485     // ---------------------
 486
 487     int GetBackgroundMode() const { return m_backgroundMode; }
 488     const wxBrush&  GetBackground() const { return m_backgroundBrush; }
 489     const wxBrush&  GetBrush() const { return m_brush; }
 490     const wxFont&   GetFont() const { return m_font; }
 491     const wxPen&    GetPen() const { return m_pen; }
 492
 493     const wxColour& GetTextForeground() const { return m_textForegroundColour; }
 494     const wxColour& GetTextBackground() const { return m_textBackgroundColour; }
 495     virtual void SetTextForeground(const wxColour& colour)
 496         { m_textForegroundColour = colour; }
 497     virtual void SetTextBackground(const wxColour& colour)
 498         { m_textBackgroundColour = colour; }
 499
 500     int GetMapMode() const { return m_mappingMode; }
 501     virtual void SetMapMode(int mode) = 0;
 502
 503     virtual void GetUserScale(double *x, double *y) const
 504     {
 505         if ( x ) *x = m_userScaleX;
 506         if ( y ) *y = m_userScaleY;
 507     }
 508     virtual void SetUserScale(double x, double y) = 0;
 509
 510     virtual void GetLogicalScale(double *x, double *y)
 511     {
 512         if ( x ) *x = m_logicalScaleX;
 513         if ( y ) *y = m_logicalScaleY;
 514     }
 515     virtual void SetLogicalScale(double x, double y)
 516     {
 517         m_logicalScaleX = x;
 518         m_logicalScaleY = y;
 519     }
 520
 521     void GetLogicalOrigin(wxCoord *x, wxCoord *y) const
 522         { DoGetLogicalOrigin(x, y); }
 523     wxPoint GetLogicalOrigin() const
 524         { wxCoord x, y; DoGetLogicalOrigin(&x, &y); return wxPoint(x, y); }
 525     virtual void SetLogicalOrigin(wxCoord x, wxCoord y) = 0;
 526
 527     void GetDeviceOrigin(wxCoord *x, wxCoord *y) const
 528         { DoGetDeviceOrigin(x, y); }
 529     wxPoint GetDeviceOrigin() const
 530         { wxCoord x, y; DoGetDeviceOrigin(&x, &y); return wxPoint(x, y); }
 531     virtual void SetDeviceOrigin(wxCoord x, wxCoord y) = 0;
 532
 533     virtual void ComputeScaleAndOrigin() {}
 534
 535     virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp) = 0;
 536
 537     int GetLogicalFunction() const { return m_logicalFunction; }
 538     virtual void SetLogicalFunction(int function) = 0;
 539
 540 #if WXWIN_COMPATIBILITY_2_4
 541     virtual void SetOptimization(bool WXUNUSED(opt)) { }
 542     virtual bool GetOptimization() { return false; }
 543 #endif
 544
 545     // bounding box
 546     // ------------
 547
 548     virtual void CalcBoundingBox(wxCoord x, wxCoord y)
 549     {
 550       if ( m_isBBoxValid )
 551       {
 552          if ( x < m_minX ) m_minX = x;
 553          if ( y < m_minY ) m_minY = y;
 554          if ( x > m_maxX ) m_maxX = x;
 555          if ( y > m_maxY ) m_maxY = y;
 556       }
 557       else
 558       {
 559          m_isBBoxValid = true;
 560
 561          m_minX = x;
 562          m_minY = y;
 563          m_maxX = x;
 564          m_maxY = y;
 565       }
 566     }
 567
 568     void ResetBoundingBox()
 569     {
 570         m_isBBoxValid = false;
 571
 572         m_minX = m_maxX = m_minY = m_maxY = 0;
 573     }
 574
 575     // Get the final bounding box of the PostScript or Metafile picture.
 576     wxCoord MinX() const { return m_minX; }
 577     wxCoord MaxX() const { return m_maxX; }
 578     wxCoord MinY() const { return m_minY; }
 579     wxCoord MaxY() const { return m_maxY; }
 580
 581     // misc old functions
 582     // ------------------
 583
 584     // for compatibility with the old code when wxCoord was long everywhere
 585     void GetTextExtent(const wxString& string,
 586                        long *x, long *y,
 587                        long *descent = NULL,
 588                        long *externalLeading = NULL,
 589                        wxFont *theFont = NULL) const
 590     {
 591         wxCoord x2, y2, descent2, externalLeading2;
 592         DoGetTextExtent(string, &x2, &y2,
 593                         &descent2, &externalLeading2,
 594                         theFont);
 595         if ( x )
 596             *x = x2;
 597         if ( y )
 598             *y = y2;
 599         if ( descent )
 600             *descent = descent2;
 601         if ( externalLeading )
 602             *externalLeading = externalLeading2;
 603     }
 604
 605     void GetLogicalOrigin(long *x, long *y) const
 606     {
 607         wxCoord x2, y2;
 608         DoGetLogicalOrigin(&x2, &y2);
 609         if ( x )
 610             *x = x2;
 611         if ( y )
 612             *y = y2;
 613     }
 614
 615     void GetDeviceOrigin(long *x, long *y) const
 616     {
 617         wxCoord x2, y2;
 618         DoGetDeviceOrigin(&x2, &y2);
 619         if ( x )
 620             *x = x2;
 621         if ( y )
 622             *y = y2;
 623     }
 624     void GetClippingBox(long *x, long *y, long *w, long *h) const
 625     {
 626         wxCoord xx,yy,ww,hh;
 627         DoGetClippingBox(&xx, &yy, &ww, &hh);
 628         if (x) *x = xx;
 629         if (y) *y = yy;
 630         if (w) *w = ww;
 631         if (h) *h = hh;
 632     }
 633
 634 protected:
 635     // the pure virtual functions which should be implemented by wxDC
 636     virtual bool DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
 637                              int style = wxFLOOD_SURFACE) = 0;
 638
 639     virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const = 0;
 640
 641     virtual void DoDrawPoint(wxCoord x, wxCoord y) = 0;
 642     virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2) = 0;
 643
 644     virtual void DoDrawArc(wxCoord x1, wxCoord y1,
 645                            wxCoord x2, wxCoord y2,
 646                            wxCoord xc, wxCoord yc) = 0;
 647     virtual void DoDrawCheckMark(wxCoord x, wxCoord y,
 648                                  wxCoord width, wxCoord height);
 649     virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 650                                    double sa, double ea) = 0;
 651
 652     virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height) = 0;
 653     virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 654                                         wxCoord width, wxCoord height,
 655                                         double radius) = 0;
 656     virtual void DoDrawEllipse(wxCoord x, wxCoord y,
 657                                wxCoord width, wxCoord height) = 0;
 658
 659     virtual void DoCrossHair(wxCoord x, wxCoord y) = 0;
 660
 661     virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y) = 0;
 662     virtual void DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 663                               bool useMask = false) = 0;
 664
 665     virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y) = 0;
 666     virtual void DoDrawRotatedText(const wxString& text,
 667                                    wxCoord x, wxCoord y, double angle) = 0;
 668
 669     virtual bool DoBlit(wxCoord xdest, wxCoord ydest,
 670                         wxCoord width, wxCoord height,
 671                         wxDC *source, wxCoord xsrc, wxCoord ysrc,
 672                         int rop = wxCOPY, bool useMask = false, wxCoord xsrcMask = wxDefaultCoord, wxCoord ysrcMask = wxDefaultCoord) = 0;
 673
 674     virtual void DoGetSize(int *width, int *height) const = 0;
 675     virtual void DoGetSizeMM(int* width, int* height) const = 0;
 676
 677     virtual void DoDrawLines(int n, wxPoint points[],
 678                              wxCoord xoffset, wxCoord yoffset) = 0;
 679     virtual void DoDrawPolygon(int n, wxPoint points[],
 680                                wxCoord xoffset, wxCoord yoffset,
 681                                int fillStyle = wxODDEVEN_RULE) = 0;
 682     virtual void DoDrawPolyPolygon(int n, int count[], wxPoint points[],
 683                                wxCoord xoffset, wxCoord yoffset,
 684                                int fillStyle);
 685
 686     virtual void DoSetClippingRegionAsRegion(const wxRegion& region) = 0;
 687     virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
 688                                      wxCoord width, wxCoord height) = 0;
 689
 690 #if WXWIN_COMPATIBILITY_2_4
 691     // this was only for confusing people, use DoGetClippingBox only
 692     virtual void DoGetClippingRegion(wxCoord *x, wxCoord *y,
 693                                      wxCoord *w, wxCoord *h)
 694         { DoGetClippingBox(x, y, w, h); }
 695 #endif
 696
 697     virtual void DoGetClippingBox(wxCoord *x, wxCoord *y,
 698                                   wxCoord *w, wxCoord *h) const
 699     {
 700         if ( x )
 701             *x = m_clipX1;
 702         if ( y )
 703             *y = m_clipY1;
 704         if ( w )
 705             *w = m_clipX2 - m_clipX1;
 706         if ( h )
 707             *h = m_clipY2 - m_clipY1;
 708     }
 709
 710     virtual void DoGetLogicalOrigin(wxCoord *x, wxCoord *y) const
 711     {
 712         if ( x ) *x = m_logicalOriginX;
 713         if ( y ) *y = m_logicalOriginY;
 714     }
 715
 716     virtual void DoGetDeviceOrigin(wxCoord *x, wxCoord *y) const
 717     {
 718         if ( x ) *x = m_deviceOriginX;
 719         if ( y ) *y = m_deviceOriginY;
 720     }
 721
 722     virtual void DoGetTextExtent(const wxString& string,
 723                                  wxCoord *x, wxCoord *y,
 724                                  wxCoord *descent = NULL,
 725                                  wxCoord *externalLeading = NULL,
 726                                  wxFont *theFont = NULL) const = 0;
 727
 728     virtual bool DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const;
 729
 730 #if wxUSE_SPLINES
 731     virtual void DoDrawSpline(wxList *points);
 732 #endif
 733
 734 protected:
 735     // unset clipping variables (after clipping region was destroyed)
 736     void ResetClipping()
 737     {
 738         m_clipping = false;
 739
 740         m_clipX1 = m_clipX2 = m_clipY1 = m_clipY2 = 0;
 741     }
 742
 743     // flags
 744     bool m_colour:1;
 745     bool m_ok:1;
 746     bool m_clipping:1;
 747     bool m_isInteractive:1;
 748     bool m_isBBoxValid:1;
 749
 750     // coordinate system variables
 751
 752     // TODO short descriptions of what exactly they are would be nice...
 753
 754     wxCoord m_logicalOriginX, m_logicalOriginY;
 755     wxCoord m_deviceOriginX, m_deviceOriginY;
 756
 757     double m_logicalScaleX, m_logicalScaleY;
 758     double m_userScaleX, m_userScaleY;
 759     double m_scaleX, m_scaleY;
 760
 761     // Used by SetAxisOrientation() to invert the axes
 762     int m_signX, m_signY;
 763
 764     // bounding and clipping boxes
 765     wxCoord m_minX, m_minY, m_maxX, m_maxY;
 766     wxCoord m_clipX1, m_clipY1, m_clipX2, m_clipY2;
 767
 768     int m_logicalFunction;
 769     int m_backgroundMode;
 770     int m_mappingMode;
 771
 772     // GDI objects
 773     wxPen             m_pen;
 774     wxBrush           m_brush;
 775     wxBrush           m_backgroundBrush;
 776     wxColour          m_textForegroundColour;
 777     wxColour          m_textBackgroundColour;
 778     wxFont            m_font;
 779
 780 #if wxUSE_PALETTE
 781     wxPalette         m_palette;
 782     bool              m_hasCustomPalette;
 783 #endif // wxUSE_PALETTE
 784
 785 private:
 786     DECLARE_NO_COPY_CLASS(wxDCBase)
 787     DECLARE_ABSTRACT_CLASS(wxDCBase)
 788 };
 789
 790 // ----------------------------------------------------------------------------
 791 // now include the declaration of wxDC class
 792 // ----------------------------------------------------------------------------
 793
 794 #if defined(__WXPALMOS__)
 795     #include "wx/palmos/dc.h"
 796 #elif defined(__WXMSW__)
 797     #include "wx/msw/dc.h"
 798 #elif defined(__WXMOTIF__)
 799     #include "wx/motif/dc.h"
 800 #elif defined(__WXGTK__)
 801     #include "wx/gtk/dc.h"
 802 #elif defined(__WXX11__)
 803     #include "wx/x11/dc.h"
 804 #elif defined(__WXMGL__)
 805     #include "wx/mgl/dc.h"
 806 #elif defined(__WXMAC__)
 807     #include "wx/mac/dc.h"
 808 #elif defined(__WXCOCOA__)
 809     #include "wx/cocoa/dc.h"
 810 #elif defined(__WXPM__)
 811     #include "wx/os2/dc.h"
 812 #endif
 813
 814 // ----------------------------------------------------------------------------
 815 // helper class: you can use it to temporarily change the DC text colour and
 816 // restore it automatically when the object goes out of scope
 817 // ----------------------------------------------------------------------------
 818
 819 class WXDLLEXPORT wxDCTextColourChanger
 820 {
 821 public:
 822     wxDCTextColourChanger(wxDC& dc) : m_dc(dc), m_colFgOld() { }
 823
 824     ~wxDCTextColourChanger()
 825     {
 826         if ( m_colFgOld.Ok() )
 827             m_dc.SetTextForeground(m_colFgOld);
 828     }
 829
 830     void Set(const wxColour& col)
 831     {
 832         if ( !m_colFgOld.Ok() )
 833             m_colFgOld = m_dc.GetTextForeground();
 834         m_dc.SetTextForeground(col);
 835     }
 836
 837 private:
 838     wxDC& m_dc;
 839
 840     wxColour m_colFgOld;
 841
 842     DECLARE_NO_COPY_CLASS(wxDCTextColourChanger)
 843 };
 844
 845 // ----------------------------------------------------------------------------
 846 // another small helper class: sets the clipping region in its ctor and
 847 // destroys it in the dtor
 848 // ----------------------------------------------------------------------------
 849
 850 class WXDLLEXPORT wxDCClipper
 851 {
 852 public:
 853     wxDCClipper(wxDC& dc, const wxRect& r) : m_dc(dc)
 854         { dc.SetClippingRegion(r.x, r.y, r.width, r.height); }
 855     wxDCClipper(wxDC& dc, wxCoord x, wxCoord y, wxCoord w, wxCoord h) : m_dc(dc)
 856         { dc.SetClippingRegion(x, y, w, h); }
 857
 858     ~wxDCClipper() { m_dc.DestroyClippingRegion(); }
 859
 860 private:
 861     wxDC& m_dc;
 862
 863     DECLARE_NO_COPY_CLASS(wxDCClipper)
 864 };
 865
 866 #endif
 867     // _WX_DC_H_BASE_