include/wx/dc.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/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 // ----------------------------------------------------------------------------
  16 // headers which we must include here
  17 // ----------------------------------------------------------------------------
  18
  19 #include "wx/object.h"          // the base class
  20
  21 #include "wx/intl.h"            // for wxLayoutDirection
  22 #include "wx/cursor.h"          // we have member variables of these classes
  23 #include "wx/font.h"            // so we can't do without them
  24 #include "wx/colour.h"
  25 #include "wx/bitmap.h"          // for wxNullBitmap
  26 #include "wx/brush.h"
  27 #include "wx/pen.h"
  28 #include "wx/palette.h"
  29 #include "wx/list.h"            // we use wxList in inline functions
  30 #include "wx/dynarray.h"
  31 #include "wx/math.h"
  32
  33 class WXDLLEXPORT wxDC;
  34 class WXDLLEXPORT wxDCBase;
  35
  36 class WXDLLEXPORT wxDrawObject
  37 {
  38 public:
  39
  40     wxDrawObject()
  41         : m_isBBoxValid(false)
  42         , m_minX(0), m_minY(0), m_maxX(0), m_maxY(0)
  43     { }
  44
  45     virtual ~wxDrawObject() { }
  46
  47     virtual void Draw(wxDCBase&) const { }
  48
  49     virtual void CalcBoundingBox(wxCoord x, wxCoord y)
  50     {
  51       if ( m_isBBoxValid )
  52       {
  53          if ( x < m_minX ) m_minX = x;
  54          if ( y < m_minY ) m_minY = y;
  55          if ( x > m_maxX ) m_maxX = x;
  56          if ( y > m_maxY ) m_maxY = y;
  57       }
  58       else
  59       {
  60          m_isBBoxValid = true;
  61
  62          m_minX = x;
  63          m_minY = y;
  64          m_maxX = x;
  65          m_maxY = y;
  66       }
  67     }
  68
  69     void ResetBoundingBox()
  70     {
  71         m_isBBoxValid = false;
  72
  73         m_minX = m_maxX = m_minY = m_maxY = 0;
  74     }
  75
  76     // Get the final bounding box of the PostScript or Metafile picture.
  77
  78     wxCoord MinX() const { return m_minX; }
  79     wxCoord MaxX() const { return m_maxX; }
  80     wxCoord MinY() const { return m_minY; }
  81     wxCoord MaxY() const { return m_maxY; }
  82
  83     //to define the type of object for derived objects
  84     virtual int GetType()=0;
  85
  86 protected:
  87     //for boundingbox calculation
  88     bool m_isBBoxValid:1;
  89     //for boundingbox calculation
  90     wxCoord m_minX, m_minY, m_maxX, m_maxY;
  91 };
  92
  93 // ---------------------------------------------------------------------------
  94 // global variables
  95 // ---------------------------------------------------------------------------
  96
  97 // ---------------------------------------------------------------------------
  98 // wxDC is the device context - object on which any drawing is done
  99 // ---------------------------------------------------------------------------
 100
 101 class WXDLLEXPORT wxDCBase : public wxObject
 102 {
 103 public:
 104     wxDCBase()
 105         : m_colour(wxColourDisplay())
 106         , m_ok(true)
 107         , m_clipping(false)
 108         , m_isInteractive(0)
 109         , m_isBBoxValid(false)
 110         , m_logicalOriginX(0), m_logicalOriginY(0)
 111         , m_deviceOriginX(0), m_deviceOriginY(0)
 112         , m_logicalScaleX(1.0), m_logicalScaleY(1.0)
 113         , m_userScaleX(1.0), m_userScaleY(1.0)
 114         , m_scaleX(1.0), m_scaleY(1.0)
 115         , m_signX(1), m_signY(1)
 116         , m_minX(0), m_minY(0), m_maxX(0), m_maxY(0)
 117         , m_clipX1(0), m_clipY1(0), m_clipX2(0), m_clipY2(0)
 118         , m_logicalFunction(wxCOPY)
 119         , m_backgroundMode(wxTRANSPARENT)
 120         , m_mappingMode(wxMM_TEXT)
 121         , m_pen()
 122         , m_brush()
 123         , m_backgroundBrush(*wxTRANSPARENT_BRUSH)
 124         , m_textForegroundColour(*wxBLACK)
 125         , m_textBackgroundColour(*wxWHITE)
 126         , m_font()
 127 #if wxUSE_PALETTE
 128         , m_palette()
 129         , m_hasCustomPalette(false)
 130 #endif // wxUSE_PALETTE
 131     {
 132         ResetBoundingBox();
 133         ResetClipping();
 134     }
 135
 136     virtual ~wxDCBase() { }
 137
 138     // graphic primitives
 139     // ------------------
 140
 141     virtual void DrawObject(wxDrawObject* drawobject)
 142     {
 143         drawobject->Draw(*this);
 144         CalcBoundingBox(drawobject->MinX(),drawobject->MinY());
 145         CalcBoundingBox(drawobject->MaxX(),drawobject->MaxY());
 146     }
 147
 148     bool FloodFill(wxCoord x, wxCoord y, const wxColour& col,
 149                    int style = wxFLOOD_SURFACE)
 150         { return DoFloodFill(x, y, col, style); }
 151     bool FloodFill(const wxPoint& pt, const wxColour& col,
 152                    int style = wxFLOOD_SURFACE)
 153         { return DoFloodFill(pt.x, pt.y, col, style); }
 154
 155     // fill the area specified by rect with a radial gradient, starting from
 156     // initialColour in the centre of the cercle and fading to destColour.
 157     void GradientFillConcentric(const wxRect& rect,
 158                                 const wxColour& initialColour,
 159                                 const wxColour& destColour)
 160         { GradientFillConcentric(rect, initialColour, destColour,
 161                                  wxPoint(rect.GetWidth() / 2,
 162                                          rect.GetHeight() / 2)); }
 163
 164     void GradientFillConcentric(const wxRect& rect,
 165                                 const wxColour& initialColour,
 166                                 const wxColour& destColour,
 167                                 const wxPoint& circleCenter)
 168         { DoGradientFillConcentric(rect, initialColour, destColour, circleCenter); }
 169
 170     // fill the area specified by rect with a linear gradient
 171     void GradientFillLinear(const wxRect& rect,
 172                             const wxColour& initialColour,
 173                             const wxColour& destColour,
 174                             wxDirection nDirection = wxEAST)
 175         { DoGradientFillLinear(rect, initialColour, destColour, nDirection); }
 176
 177     bool GetPixel(wxCoord x, wxCoord y, wxColour *col) const
 178         { return DoGetPixel(x, y, col); }
 179     bool GetPixel(const wxPoint& pt, wxColour *col) const
 180         { return DoGetPixel(pt.x, pt.y, col); }
 181
 182     void DrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
 183         { DoDrawLine(x1, y1, x2, y2); }
 184     void DrawLine(const wxPoint& pt1, const wxPoint& pt2)
 185         { DoDrawLine(pt1.x, pt1.y, pt2.x, pt2.y); }
 186
 187     void CrossHair(wxCoord x, wxCoord y)
 188         { DoCrossHair(x, y); }
 189     void CrossHair(const wxPoint& pt)
 190         { DoCrossHair(pt.x, pt.y); }
 191
 192     void DrawArc(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2,
 193                  wxCoord xc, wxCoord yc)
 194         { DoDrawArc(x1, y1, x2, y2, xc, yc); }
 195     void DrawArc(const wxPoint& pt1, const wxPoint& pt2, const wxPoint& centre)
 196         { DoDrawArc(pt1.x, pt1.y, pt2.x, pt2.y, centre.x, centre.y); }
 197
 198     void DrawCheckMark(wxCoord x, wxCoord y,
 199                        wxCoord width, wxCoord height)
 200         { DoDrawCheckMark(x, y, width, height); }
 201     void DrawCheckMark(const wxRect& rect)
 202         { DoDrawCheckMark(rect.x, rect.y, rect.width, rect.height); }
 203
 204     void DrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 205                          double sa, double ea)
 206         { DoDrawEllipticArc(x, y, w, h, sa, ea); }
 207     void DrawEllipticArc(const wxPoint& pt, const wxSize& sz,
 208                          double sa, double ea)
 209         { DoDrawEllipticArc(pt.x, pt.y, sz.x, sz.y, sa, ea); }
 210
 211     void DrawPoint(wxCoord x, wxCoord y)
 212         { DoDrawPoint(x, y); }
 213     void DrawPoint(const wxPoint& pt)
 214         { DoDrawPoint(pt.x, pt.y); }
 215
 216     void DrawLines(int n, wxPoint points[],
 217                    wxCoord xoffset = 0, wxCoord yoffset = 0)
 218         { DoDrawLines(n, points, xoffset, yoffset); }
 219     void DrawLines(const wxList *list,
 220                    wxCoord xoffset = 0, wxCoord yoffset = 0);
 221
 222     void DrawPolygon(int n, wxPoint points[],
 223                      wxCoord xoffset = 0, wxCoord yoffset = 0,
 224                      int fillStyle = wxODDEVEN_RULE)
 225         { DoDrawPolygon(n, points, xoffset, yoffset, fillStyle); }
 226
 227     void DrawPolygon(const wxList *list,
 228                      wxCoord xoffset = 0, wxCoord yoffset = 0,
 229                      int fillStyle = wxODDEVEN_RULE);
 230
 231     void DrawPolyPolygon(int n, int count[], wxPoint points[],
 232                          wxCoord xoffset = 0, wxCoord yoffset = 0,
 233                          int fillStyle = wxODDEVEN_RULE)
 234         { DoDrawPolyPolygon(n, count, points, xoffset, yoffset, fillStyle); }
 235
 236     void DrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 237         { DoDrawRectangle(x, y, width, height); }
 238     void DrawRectangle(const wxPoint& pt, const wxSize& sz)
 239         { DoDrawRectangle(pt.x, pt.y, sz.x, sz.y); }
 240     void DrawRectangle(const wxRect& rect)
 241         { DoDrawRectangle(rect.x, rect.y, rect.width, rect.height); }
 242
 243     void DrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height,
 244                               double radius)
 245         { DoDrawRoundedRectangle(x, y, width, height, radius); }
 246     void DrawRoundedRectangle(const wxPoint& pt, const wxSize& sz,
 247                              double radius)
 248         { DoDrawRoundedRectangle(pt.x, pt.y, sz.x, sz.y, radius); }
 249     void DrawRoundedRectangle(const wxRect& r, double radius)
 250         { DoDrawRoundedRectangle(r.x, r.y, r.width, r.height, radius); }
 251
 252     void DrawCircle(wxCoord x, wxCoord y, wxCoord radius)
 253         { DoDrawEllipse(x - radius, y - radius, 2*radius, 2*radius); }
 254     void DrawCircle(const wxPoint& pt, wxCoord radius)
 255         { DrawCircle(pt.x, pt.y, radius); }
 256
 257     void DrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 258         { DoDrawEllipse(x, y, width, height); }
 259     void DrawEllipse(const wxPoint& pt, const wxSize& sz)
 260         { DoDrawEllipse(pt.x, pt.y, sz.x, sz.y); }
 261     void DrawEllipse(const wxRect& rect)
 262         { DoDrawEllipse(rect.x, rect.y, rect.width, rect.height); }
 263
 264     void DrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 265         { DoDrawIcon(icon, x, y); }
 266     void DrawIcon(const wxIcon& icon, const wxPoint& pt)
 267         { DoDrawIcon(icon, pt.x, pt.y); }
 268
 269     void DrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 270                     bool useMask = false)
 271         { DoDrawBitmap(bmp, x, y, useMask); }
 272     void DrawBitmap(const wxBitmap &bmp, const wxPoint& pt,
 273                     bool useMask = false)
 274         { DoDrawBitmap(bmp, pt.x, pt.y, useMask); }
 275
 276     void DrawText(const wxString& text, wxCoord x, wxCoord y)
 277         { DoDrawText(text, x, y); }
 278     void DrawText(const wxString& text, const wxPoint& pt)
 279         { DoDrawText(text, pt.x, pt.y); }
 280
 281     void DrawRotatedText(const wxString& text, wxCoord x, wxCoord y, double angle)
 282         { DoDrawRotatedText(text, x, y, angle); }
 283     void DrawRotatedText(const wxString& text, const wxPoint& pt, double angle)
 284         { DoDrawRotatedText(text, pt.x, pt.y, angle); }
 285
 286     // this version puts both optional bitmap and the text into the given
 287     // rectangle and aligns is as specified by alignment parameter; it also
 288     // will emphasize the character with the given index if it is != -1 and
 289     // return the bounding rectangle if required
 290     virtual void DrawLabel(const wxString& text,
 291                            const wxBitmap& image,
 292                            const wxRect& rect,
 293                            int alignment = wxALIGN_LEFT | wxALIGN_TOP,
 294                            int indexAccel = -1,
 295                            wxRect *rectBounding = NULL);
 296
 297     void DrawLabel(const wxString& text, const wxRect& rect,
 298                    int alignment = wxALIGN_LEFT | wxALIGN_TOP,
 299                    int indexAccel = -1)
 300         { DrawLabel(text, wxNullBitmap, rect, alignment, indexAccel); }
 301
 302     bool Blit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 303               wxDC *source, wxCoord xsrc, wxCoord ysrc,
 304               int rop = wxCOPY, bool useMask = false, wxCoord xsrcMask = wxDefaultCoord, wxCoord ysrcMask = wxDefaultCoord)
 305     {
 306         return DoBlit(xdest, ydest, width, height,
 307                       source, xsrc, ysrc, rop, useMask, xsrcMask, ysrcMask);
 308     }
 309     bool Blit(const wxPoint& destPt, const wxSize& sz,
 310               wxDC *source, const wxPoint& srcPt,
 311               int rop = wxCOPY, bool useMask = false, const wxPoint& srcPtMask = wxDefaultPosition)
 312     {
 313         return DoBlit(destPt.x, destPt.y, sz.x, sz.y,
 314                       source, srcPt.x, srcPt.y, rop, useMask, srcPtMask.x, srcPtMask.y);
 315     }
 316
 317     wxBitmap GetAsBitmap(const wxRect *subrect = (const wxRect *) NULL) const
 318     {
 319         return DoGetAsBitmap(subrect);
 320     }
 321
 322 #if wxUSE_SPLINES
 323     // TODO: this API needs fixing (wxPointList, why (!const) "wxList *"?)
 324     void DrawSpline(wxCoord x1, wxCoord y1,
 325                     wxCoord x2, wxCoord y2,
 326                     wxCoord x3, wxCoord y3);
 327     void DrawSpline(int n, wxPoint points[]);
 328
 329     void DrawSpline(wxList *points) { DoDrawSpline(points); }
 330 #endif // wxUSE_SPLINES
 331
 332     // Eventually we will have wxUSE_GENERIC_DRAWELLIPSE
 333 #ifdef __WXWINCE__
 334     //! Generic method to draw ellipses, circles and arcs with current pen and brush.
 335     /*! \param x Upper left corner of bounding box.
 336      *  \param y Upper left corner of bounding box.
 337      *  \param w Width of bounding box.
 338      *  \param h Height of bounding box.
 339      *  \param sa Starting angle of arc
 340      *            (counterclockwise, start at 3 o'clock, 360 is full circle).
 341      *  \param ea Ending angle of arc.
 342      *  \param angle Rotation angle, the Arc will be rotated after
 343      *               calculating begin and end.
 344      */
 345     void DrawEllipticArcRot( wxCoord x, wxCoord y,
 346                              wxCoord width, wxCoord height,
 347                              double sa = 0, double ea = 0, double angle = 0 )
 348     { DoDrawEllipticArcRot( x, y, width, height, sa, ea, angle ); }
 349
 350     void DrawEllipticArcRot( const wxPoint& pt,
 351                              const wxSize& sz,
 352                              double sa = 0, double ea = 0, double angle = 0 )
 353     { DoDrawEllipticArcRot( pt.x, pt.y, sz.x, sz.y, sa, ea, angle ); }
 354
 355     void DrawEllipticArcRot( const wxRect& rect,
 356                              double sa = 0, double ea = 0, double angle = 0 )
 357     { DoDrawEllipticArcRot( rect.x, rect.y, rect.width, rect.height, sa, ea, angle ); }
 358
 359     virtual void DoDrawEllipticArcRot( wxCoord x, wxCoord y,
 360                                        wxCoord w, wxCoord h,
 361                                        double sa = 0, double ea = 0, double angle = 0 );
 362
 363     //! Rotates points around center.
 364     /*! This is a quite straight method, it calculates in pixels
 365      *  and so it produces rounding errors.
 366      *  \param points The points inside will be rotated.
 367      *  \param angle Rotating angle (counterclockwise, start at 3 o'clock, 360 is full circle).
 368      *  \param center Center of rotation.
 369      */
 370     void Rotate( wxList* points, double angle, wxPoint center = wxPoint(0,0) );
 371
 372     // used by DrawEllipticArcRot
 373     // Careful: wxList gets filled with points you have to delete later.
 374     void CalculateEllipticPoints( wxList* points,
 375                                   wxCoord xStart, wxCoord yStart,
 376                                   wxCoord w, wxCoord h,
 377                                   double sa, double ea );
 378 #endif
 379
 380     // global DC operations
 381     // --------------------
 382
 383     virtual void Clear() = 0;
 384
 385     virtual bool StartDoc(const wxString& WXUNUSED(message)) { return true; }
 386     virtual void EndDoc() { }
 387
 388     virtual void StartPage() { }
 389     virtual void EndPage() { }
 390
 391 #if WXWIN_COMPATIBILITY_2_6
 392     wxDEPRECATED( void BeginDrawing() );
 393     wxDEPRECATED( void EndDrawing() );
 394 #endif // WXWIN_COMPATIBILITY_2_6
 395
 396
 397     // set objects to use for drawing
 398     // ------------------------------
 399
 400     virtual void SetFont(const wxFont& font) = 0;
 401     virtual void SetPen(const wxPen& pen) = 0;
 402     virtual void SetBrush(const wxBrush& brush) = 0;
 403     virtual void SetBackground(const wxBrush& brush) = 0;
 404     virtual void SetBackgroundMode(int mode) = 0;
 405 #if wxUSE_PALETTE
 406     virtual void SetPalette(const wxPalette& palette) = 0;
 407 #endif // wxUSE_PALETTE
 408
 409     // clipping region
 410     // ---------------
 411
 412     void SetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 413         { DoSetClippingRegion(x, y, width, height); }
 414     void SetClippingRegion(const wxPoint& pt, const wxSize& sz)
 415         { DoSetClippingRegion(pt.x, pt.y, sz.x, sz.y); }
 416     void SetClippingRegion(const wxRect& rect)
 417         { DoSetClippingRegion(rect.x, rect.y, rect.width, rect.height); }
 418     void SetClippingRegion(const wxRegion& region)
 419         { DoSetClippingRegionAsRegion(region); }
 420
 421     virtual void DestroyClippingRegion() { ResetClipping(); }
 422
 423     void GetClippingBox(wxCoord *x, wxCoord *y, wxCoord *w, wxCoord *h) const
 424         { DoGetClippingBox(x, y, w, h); }
 425     void GetClippingBox(wxRect& rect) const
 426         {
 427           DoGetClippingBox(&rect.x, &rect.y, &rect.width, &rect.height);
 428         }
 429
 430     // text extent
 431     // -----------
 432
 433     virtual wxCoord GetCharHeight() const = 0;
 434     virtual wxCoord GetCharWidth() const = 0;
 435
 436     // only works for single line strings
 437     void GetTextExtent(const wxString& string,
 438                        wxCoord *x, wxCoord *y,
 439                        wxCoord *descent = NULL,
 440                        wxCoord *externalLeading = NULL,
 441                        wxFont *theFont = NULL) const
 442         { DoGetTextExtent(string, x, y, descent, externalLeading, theFont); }
 443
 444     // works for single as well as multi-line strings
 445     virtual void GetMultiLineTextExtent(const wxString& text,
 446                                         wxCoord *width,
 447                                         wxCoord *height,
 448                                         wxCoord *heightLine = NULL,
 449                                         wxFont *font = NULL) const;
 450
 451     // Measure cumulative width of text after each character
 452     bool GetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 453         { return DoGetPartialTextExtents(text, widths); }
 454
 455
 456     // size and resolution
 457     // -------------------
 458
 459     // in device units
 460     void GetSize(int *width, int *height) const
 461         { DoGetSize(width, height); }
 462     wxSize GetSize() const
 463     {
 464         int w, h;
 465         DoGetSize(&w, &h);
 466
 467         return wxSize(w, h);
 468     }
 469
 470     // in mm
 471     void GetSizeMM(int* width, int* height) const
 472         { DoGetSizeMM(width, height); }
 473     wxSize GetSizeMM() const
 474     {
 475         int w, h;
 476         DoGetSizeMM(&w, &h);
 477
 478         return wxSize(w, h);
 479     }
 480
 481     // coordinates conversions
 482     // -----------------------
 483
 484     // This group of functions does actual conversion of the input, as you'd
 485     // expect.
 486     wxCoord DeviceToLogicalX(wxCoord x) const;
 487     wxCoord DeviceToLogicalY(wxCoord y) const;
 488     wxCoord DeviceToLogicalXRel(wxCoord x) const;
 489     wxCoord DeviceToLogicalYRel(wxCoord y) const;
 490     wxCoord LogicalToDeviceX(wxCoord x) const;
 491     wxCoord LogicalToDeviceY(wxCoord y) const;
 492     wxCoord LogicalToDeviceXRel(wxCoord x) const;
 493     wxCoord LogicalToDeviceYRel(wxCoord y) const;
 494
 495     // query DC capabilities
 496     // ---------------------
 497
 498     virtual bool CanDrawBitmap() const = 0;
 499     virtual bool CanGetTextExtent() const = 0;
 500
 501     // colour depth
 502     virtual int GetDepth() const = 0;
 503
 504     // Resolution in Pixels per inch
 505     virtual wxSize GetPPI() const = 0;
 506
 507     virtual bool Ok() const { return IsOk(); }
 508     virtual bool IsOk() const { return m_ok; }
 509
 510     // accessors and setters
 511     // ---------------------
 512
 513     virtual int GetBackgroundMode() const { return m_backgroundMode; }
 514     virtual const wxBrush&  GetBackground() const { return m_backgroundBrush; }
 515     virtual const wxBrush&  GetBrush() const { return m_brush; }
 516     virtual const wxFont&   GetFont() const { return m_font; }
 517     virtual const wxPen&    GetPen() const { return m_pen; }
 518
 519     virtual const wxColour& GetTextForeground() const { return m_textForegroundColour; }
 520     virtual const wxColour& GetTextBackground() const { return m_textBackgroundColour; }
 521     virtual void SetTextForeground(const wxColour& colour)
 522         { m_textForegroundColour = colour; }
 523     virtual void SetTextBackground(const wxColour& colour)
 524         { m_textBackgroundColour = colour; }
 525
 526     virtual int GetMapMode() const { return m_mappingMode; }
 527     virtual void SetMapMode(int mode) = 0;
 528
 529     virtual void GetUserScale(double *x, double *y) const
 530     {
 531         if ( x ) *x = m_userScaleX;
 532         if ( y ) *y = m_userScaleY;
 533     }
 534     virtual void SetUserScale(double x, double y) = 0;
 535
 536     virtual void GetLogicalScale(double *x, double *y)
 537     {
 538         if ( x ) *x = m_logicalScaleX;
 539         if ( y ) *y = m_logicalScaleY;
 540     }
 541     virtual void SetLogicalScale(double x, double y)
 542     {
 543         m_logicalScaleX = x;
 544         m_logicalScaleY = y;
 545     }
 546
 547     void GetLogicalOrigin(wxCoord *x, wxCoord *y) const
 548         { DoGetLogicalOrigin(x, y); }
 549     wxPoint GetLogicalOrigin() const
 550         { wxCoord x, y; DoGetLogicalOrigin(&x, &y); return wxPoint(x, y); }
 551     virtual void SetLogicalOrigin(wxCoord x, wxCoord y) = 0;
 552
 553     void GetDeviceOrigin(wxCoord *x, wxCoord *y) const
 554         { DoGetDeviceOrigin(x, y); }
 555     wxPoint GetDeviceOrigin() const
 556         { wxCoord x, y; DoGetDeviceOrigin(&x, &y); return wxPoint(x, y); }
 557     virtual void SetDeviceOrigin(wxCoord x, wxCoord y) = 0;
 558
 559     virtual void ComputeScaleAndOrigin() {}
 560
 561     virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp) = 0;
 562
 563     virtual int GetLogicalFunction() const { return m_logicalFunction; }
 564     virtual void SetLogicalFunction(int function) = 0;
 565
 566 #if WXWIN_COMPATIBILITY_2_4
 567     virtual void SetOptimization(bool WXUNUSED(opt)) { }
 568     virtual bool GetOptimization() { return false; }
 569 #endif
 570
 571     // bounding box
 572     // ------------
 573
 574     virtual void CalcBoundingBox(wxCoord x, wxCoord y)
 575     {
 576       if ( m_isBBoxValid )
 577       {
 578          if ( x < m_minX ) m_minX = x;
 579          if ( y < m_minY ) m_minY = y;
 580          if ( x > m_maxX ) m_maxX = x;
 581          if ( y > m_maxY ) m_maxY = y;
 582       }
 583       else
 584       {
 585          m_isBBoxValid = true;
 586
 587          m_minX = x;
 588          m_minY = y;
 589          m_maxX = x;
 590          m_maxY = y;
 591       }
 592     }
 593
 594     void ResetBoundingBox()
 595     {
 596         m_isBBoxValid = false;
 597
 598         m_minX = m_maxX = m_minY = m_maxY = 0;
 599     }
 600
 601     // Get the final bounding box of the PostScript or Metafile picture.
 602     wxCoord MinX() const { return m_minX; }
 603     wxCoord MaxX() const { return m_maxX; }
 604     wxCoord MinY() const { return m_minY; }
 605     wxCoord MaxY() const { return m_maxY; }
 606
 607     // misc old functions
 608     // ------------------
 609
 610     // for compatibility with the old code when wxCoord was long everywhere
 611     void GetTextExtent(const wxString& string,
 612                        long *x, long *y,
 613                        long *descent = NULL,
 614                        long *externalLeading = NULL,
 615                        wxFont *theFont = NULL) const
 616     {
 617         wxCoord x2, y2, descent2, externalLeading2;
 618         DoGetTextExtent(string, &x2, &y2,
 619                         &descent2, &externalLeading2,
 620                         theFont);
 621         if ( x )
 622             *x = x2;
 623         if ( y )
 624             *y = y2;
 625         if ( descent )
 626             *descent = descent2;
 627         if ( externalLeading )
 628             *externalLeading = externalLeading2;
 629     }
 630
 631     void GetLogicalOrigin(long *x, long *y) const
 632     {
 633         wxCoord x2, y2;
 634         DoGetLogicalOrigin(&x2, &y2);
 635         if ( x )
 636             *x = x2;
 637         if ( y )
 638             *y = y2;
 639     }
 640
 641     void GetDeviceOrigin(long *x, long *y) const
 642     {
 643         wxCoord x2, y2;
 644         DoGetDeviceOrigin(&x2, &y2);
 645         if ( x )
 646             *x = x2;
 647         if ( y )
 648             *y = y2;
 649     }
 650     void GetClippingBox(long *x, long *y, long *w, long *h) const
 651     {
 652         wxCoord xx,yy,ww,hh;
 653         DoGetClippingBox(&xx, &yy, &ww, &hh);
 654         if (x) *x = xx;
 655         if (y) *y = yy;
 656         if (w) *w = ww;
 657         if (h) *h = hh;
 658     }
 659
 660     // RTL related functions
 661     // ---------------------
 662
 663     // get or change the layout direction (LTR or RTL) for this dc,
 664     // wxLayout_Default is returned if layout direction is not supported
 665     virtual wxLayoutDirection GetLayoutDirection() const
 666         { return wxLayout_Default; }
 667     virtual void SetLayoutDirection(wxLayoutDirection WXUNUSED(dir))
 668         { }
 669
 670 protected:
 671     // the pure virtual functions which should be implemented by wxDC
 672     virtual bool DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
 673                              int style = wxFLOOD_SURFACE) = 0;
 674
 675     virtual void DoGradientFillLinear(const wxRect& rect,
 676                                       const wxColour& initialColour,
 677                                       const wxColour& destColour,
 678                                       wxDirection nDirection = wxEAST);
 679
 680     virtual void DoGradientFillConcentric(const wxRect& rect,
 681                                         const wxColour& initialColour,
 682                                         const wxColour& destColour,
 683                                         const wxPoint& circleCenter);
 684
 685     virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const = 0;
 686
 687     virtual void DoDrawPoint(wxCoord x, wxCoord y) = 0;
 688     virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2) = 0;
 689
 690     virtual void DoDrawArc(wxCoord x1, wxCoord y1,
 691                            wxCoord x2, wxCoord y2,
 692                            wxCoord xc, wxCoord yc) = 0;
 693     virtual void DoDrawCheckMark(wxCoord x, wxCoord y,
 694                                  wxCoord width, wxCoord height);
 695     virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 696                                    double sa, double ea) = 0;
 697
 698     virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height) = 0;
 699     virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 700                                         wxCoord width, wxCoord height,
 701                                         double radius) = 0;
 702     virtual void DoDrawEllipse(wxCoord x, wxCoord y,
 703                                wxCoord width, wxCoord height) = 0;
 704
 705     virtual void DoCrossHair(wxCoord x, wxCoord y) = 0;
 706
 707     virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y) = 0;
 708     virtual void DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 709                               bool useMask = false) = 0;
 710
 711     virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y) = 0;
 712     virtual void DoDrawRotatedText(const wxString& text,
 713                                    wxCoord x, wxCoord y, double angle) = 0;
 714
 715     virtual bool DoBlit(wxCoord xdest, wxCoord ydest,
 716                         wxCoord width, wxCoord height,
 717                         wxDC *source, wxCoord xsrc, wxCoord ysrc,
 718                         int rop = wxCOPY, bool useMask = false, wxCoord xsrcMask = wxDefaultCoord, wxCoord ysrcMask = wxDefaultCoord) = 0;
 719
 720     virtual wxBitmap DoGetAsBitmap(const wxRect *WXUNUSED(subrect)) const { return wxNullBitmap; }
 721
 722     virtual void DoGetSize(int *width, int *height) const = 0;
 723     virtual void DoGetSizeMM(int* width, int* height) const = 0;
 724
 725     virtual void DoDrawLines(int n, wxPoint points[],
 726                              wxCoord xoffset, wxCoord yoffset) = 0;
 727     virtual void DoDrawPolygon(int n, wxPoint points[],
 728                                wxCoord xoffset, wxCoord yoffset,
 729                                int fillStyle = wxODDEVEN_RULE) = 0;
 730     virtual void DoDrawPolyPolygon(int n, int count[], wxPoint points[],
 731                                wxCoord xoffset, wxCoord yoffset,
 732                                int fillStyle);
 733
 734     virtual void DoSetClippingRegionAsRegion(const wxRegion& region) = 0;
 735     virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
 736                                      wxCoord width, wxCoord height) = 0;
 737
 738 #if WXWIN_COMPATIBILITY_2_4
 739     // this was only for confusing people, use DoGetClippingBox only
 740     virtual void DoGetClippingRegion(wxCoord *x, wxCoord *y,
 741                                      wxCoord *w, wxCoord *h)
 742         { DoGetClippingBox(x, y, w, h); }
 743 #endif
 744
 745     virtual void DoGetClippingBox(wxCoord *x, wxCoord *y,
 746                                   wxCoord *w, wxCoord *h) const
 747     {
 748         if ( x )
 749             *x = m_clipX1;
 750         if ( y )
 751             *y = m_clipY1;
 752         if ( w )
 753             *w = m_clipX2 - m_clipX1;
 754         if ( h )
 755             *h = m_clipY2 - m_clipY1;
 756     }
 757
 758     virtual void DoGetLogicalOrigin(wxCoord *x, wxCoord *y) const
 759     {
 760         if ( x ) *x = m_logicalOriginX;
 761         if ( y ) *y = m_logicalOriginY;
 762     }
 763
 764     virtual void DoGetDeviceOrigin(wxCoord *x, wxCoord *y) const
 765     {
 766         if ( x ) *x = m_deviceOriginX;
 767         if ( y ) *y = m_deviceOriginY;
 768     }
 769
 770     virtual void DoGetTextExtent(const wxString& string,
 771                                  wxCoord *x, wxCoord *y,
 772                                  wxCoord *descent = NULL,
 773                                  wxCoord *externalLeading = NULL,
 774                                  wxFont *theFont = NULL) const = 0;
 775
 776     virtual bool DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const;
 777
 778 #if wxUSE_SPLINES
 779     virtual void DoDrawSpline(wxList *points);
 780 #endif
 781
 782 protected:
 783     // unset clipping variables (after clipping region was destroyed)
 784     void ResetClipping()
 785     {
 786         m_clipping = false;
 787
 788         m_clipX1 = m_clipX2 = m_clipY1 = m_clipY2 = 0;
 789     }
 790
 791     // flags
 792     bool m_colour:1;
 793     bool m_ok:1;
 794     bool m_clipping:1;
 795     bool m_isInteractive:1;
 796     bool m_isBBoxValid:1;
 797
 798     // coordinate system variables
 799
 800     // TODO short descriptions of what exactly they are would be nice...
 801
 802     wxCoord m_logicalOriginX, m_logicalOriginY;
 803     wxCoord m_deviceOriginX, m_deviceOriginY;
 804
 805     double m_logicalScaleX, m_logicalScaleY;
 806     double m_userScaleX, m_userScaleY;
 807     double m_scaleX, m_scaleY;
 808
 809     // Used by SetAxisOrientation() to invert the axes
 810     int m_signX, m_signY;
 811
 812     // bounding and clipping boxes
 813     wxCoord m_minX, m_minY, m_maxX, m_maxY;
 814     wxCoord m_clipX1, m_clipY1, m_clipX2, m_clipY2;
 815
 816     int m_logicalFunction;
 817     int m_backgroundMode;
 818     int m_mappingMode;
 819
 820     // GDI objects
 821     wxPen             m_pen;
 822     wxBrush           m_brush;
 823     wxBrush           m_backgroundBrush;
 824     wxColour          m_textForegroundColour;
 825     wxColour          m_textBackgroundColour;
 826     wxFont            m_font;
 827
 828 #if wxUSE_PALETTE
 829     wxPalette         m_palette;
 830     bool              m_hasCustomPalette;
 831 #endif // wxUSE_PALETTE
 832
 833 private:
 834     DECLARE_NO_COPY_CLASS(wxDCBase)
 835     DECLARE_ABSTRACT_CLASS(wxDCBase)
 836 };
 837
 838 // ----------------------------------------------------------------------------
 839 // now include the declaration of wxDC class
 840 // ----------------------------------------------------------------------------
 841
 842 #if defined(__WXPALMOS__)
 843     #include "wx/palmos/dc.h"
 844 #elif defined(__WXMSW__)
 845     #include "wx/msw/dc.h"
 846 #elif defined(__WXMOTIF__)
 847     #include "wx/motif/dc.h"
 848 #elif defined(__WXGTK20__)
 849     #include "wx/gtk/dc.h"
 850 #elif defined(__WXGTK__)
 851     #include "wx/gtk1/dc.h"
 852 #elif defined(__WXX11__)
 853     #include "wx/x11/dc.h"
 854 #elif defined(__WXMGL__)
 855     #include "wx/mgl/dc.h"
 856 #elif defined(__WXDFB__)
 857     #include "wx/dfb/dc.h"
 858 #elif defined(__WXMAC__)
 859     #include "wx/mac/dc.h"
 860 #elif defined(__WXCOCOA__)
 861     #include "wx/cocoa/dc.h"
 862 #elif defined(__WXPM__)
 863     #include "wx/os2/dc.h"
 864 #endif
 865
 866 #if wxUSE_GRAPHICS_CONTEXT
 867     #include "wx/dcgraph.h"
 868 #endif
 869
 870 // ----------------------------------------------------------------------------
 871 // helper class: you can use it to temporarily change the DC text colour and
 872 // restore it automatically when the object goes out of scope
 873 // ----------------------------------------------------------------------------
 874
 875 class WXDLLEXPORT wxDCTextColourChanger
 876 {
 877 public:
 878     wxDCTextColourChanger(wxDC& dc) : m_dc(dc), m_colFgOld() { }
 879
 880     wxDCTextColourChanger(wxDC& dc, const wxColour& col) : m_dc(dc)
 881     {
 882         Set(col);
 883     }
 884
 885     ~wxDCTextColourChanger()
 886     {
 887         if ( m_colFgOld.Ok() )
 888             m_dc.SetTextForeground(m_colFgOld);
 889     }
 890
 891     void Set(const wxColour& col)
 892     {
 893         if ( !m_colFgOld.Ok() )
 894             m_colFgOld = m_dc.GetTextForeground();
 895         m_dc.SetTextForeground(col);
 896     }
 897
 898 private:
 899     wxDC& m_dc;
 900
 901     wxColour m_colFgOld;
 902
 903     DECLARE_NO_COPY_CLASS(wxDCTextColourChanger)
 904 };
 905
 906 // ----------------------------------------------------------------------------
 907 // helper class: you can use it to temporarily change the DC pen and
 908 // restore it automatically when the object goes out of scope
 909 // ----------------------------------------------------------------------------
 910
 911 class WXDLLEXPORT wxDCPenChanger
 912 {
 913 public:
 914     wxDCPenChanger(wxDC& dc, const wxPen& pen) : m_dc(dc), m_penOld(dc.GetPen())
 915     {
 916         m_dc.SetPen(pen);
 917     }
 918
 919     ~wxDCPenChanger()
 920     {
 921         if ( m_penOld.Ok() )
 922             m_dc.SetPen(m_penOld);
 923     }
 924
 925 private:
 926     wxDC& m_dc;
 927
 928     wxPen m_penOld;
 929
 930     DECLARE_NO_COPY_CLASS(wxDCPenChanger)
 931 };
 932
 933 // ----------------------------------------------------------------------------
 934 // helper class: you can use it to temporarily change the DC brush and
 935 // restore it automatically when the object goes out of scope
 936 // ----------------------------------------------------------------------------
 937
 938 class WXDLLEXPORT wxDCBrushChanger
 939 {
 940 public:
 941     wxDCBrushChanger(wxDC& dc, const wxBrush& brush) : m_dc(dc), m_brushOld(dc.GetBrush())
 942     {
 943         m_dc.SetBrush(brush);
 944     }
 945
 946     ~wxDCBrushChanger()
 947     {
 948         if ( m_brushOld.Ok() )
 949             m_dc.SetBrush(m_brushOld);
 950     }
 951
 952 private:
 953     wxDC& m_dc;
 954
 955     wxBrush m_brushOld;
 956
 957     DECLARE_NO_COPY_CLASS(wxDCBrushChanger)
 958 };
 959
 960 // ----------------------------------------------------------------------------
 961 // another small helper class: sets the clipping region in its ctor and
 962 // destroys it in the dtor
 963 // ----------------------------------------------------------------------------
 964
 965 class WXDLLEXPORT wxDCClipper
 966 {
 967 public:
 968     wxDCClipper(wxDC& dc, const wxRegion& r) : m_dc(dc)
 969         { dc.SetClippingRegion(r); }
 970     wxDCClipper(wxDC& dc, const wxRect& r) : m_dc(dc)
 971         { dc.SetClippingRegion(r.x, r.y, r.width, r.height); }
 972     wxDCClipper(wxDC& dc, wxCoord x, wxCoord y, wxCoord w, wxCoord h) : m_dc(dc)
 973         { dc.SetClippingRegion(x, y, w, h); }
 974
 975     ~wxDCClipper() { m_dc.DestroyClippingRegion(); }
 976
 977 private:
 978     wxDC& m_dc;
 979
 980     DECLARE_NO_COPY_CLASS(wxDCClipper)
 981 };
 982
 983 #endif // _WX_DC_H_BASE_