include/wx/dc.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dc.h
   3 // Purpose:     wxDC class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     05/25/99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWindows team
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_DC_H_BASE_
  13 #define _WX_DC_H_BASE_
  14
  15 #ifdef __GNUG__
  16     #pragma interface "dcbase.h"
  17 #endif
  18
  19 // ----------------------------------------------------------------------------
  20 // headers which we must include here
  21 // ----------------------------------------------------------------------------
  22
  23 #include "wx/object.h"          // the base class
  24
  25 #include "wx/cursor.h"          // we have member variables of these classes
  26 #include "wx/font.h"            // so we can't do without them
  27 #include "wx/colour.h"
  28 #include "wx/brush.h"
  29 #include "wx/pen.h"
  30 #include "wx/palette.h"
  31
  32 #include "wx/list.h"            // we use wxList in inline functions
  33
  34 // ---------------------------------------------------------------------------
  35 // types
  36 // ---------------------------------------------------------------------------
  37
  38 // type which should be used (whenever possible, i.e. as long as it doesn't
  39 // break compatibility) for screen coordinates
  40 typedef int wxCoord;
  41
  42 // ---------------------------------------------------------------------------
  43 // global variables
  44 // ---------------------------------------------------------------------------
  45
  46 WXDLLEXPORT_DATA(extern int) wxPageNumber;
  47
  48 // ---------------------------------------------------------------------------
  49 // wxDC is the device context - object on which any drawing is done
  50 // ---------------------------------------------------------------------------
  51
  52 class WXDLLEXPORT wxDCBase : public wxObject
  53 {
  54     DECLARE_ABSTRACT_CLASS(wxDCBase)
  55
  56 public:
  57     wxDCBase()
  58     {
  59         m_clipping = FALSE;
  60         m_ok = TRUE;
  61
  62         m_minX = m_minY = m_maxX = m_maxY = 0;
  63
  64         m_signX = m_signY = 1;
  65
  66         m_logicalOriginX = m_logicalOriginY =
  67         m_deviceOriginX = m_deviceOriginY = 0;
  68
  69         m_logicalScaleX = m_logicalScaleY =
  70         m_userScaleX = m_userScaleY =
  71         m_scaleX = m_scaleY = 1.0;
  72
  73         m_logicalFunction = -1;
  74
  75         m_backgroundMode = wxTRANSPARENT;
  76
  77         m_mappingMode = wxMM_TEXT;
  78
  79         m_backgroundBrush = *wxTRANSPARENT_BRUSH;
  80
  81         m_textForegroundColour = *wxBLACK;
  82         m_textBackgroundColour = *wxWHITE;
  83
  84         m_colour = wxColourDisplay();
  85     }
  86
  87     ~wxDCBase() { }
  88
  89     virtual void BeginDrawing() { }
  90     virtual void EndDrawing() { }
  91
  92     // graphic primitives
  93     // ------------------
  94
  95     void FloodFill(long x, long y, const wxColour& col,
  96             int style = wxFLOOD_SURFACE)
  97         { DoFloodFill(x, y, col, style); }
  98     void FloodFill(const wxPoint& pt, const wxColour& col,
  99             int style = wxFLOOD_SURFACE)
 100         { DoFloodFill(pt.x, pt.y, col, style); }
 101
 102     bool GetPixel(long x, long y, wxColour *col) const
 103         { return DoGetPixel(x, y, col); }
 104     bool GetPixel(const wxPoint& pt, wxColour *col) const
 105         { return DoGetPixel(pt.x, pt.y, col); }
 106
 107     void DrawLine(long x1, long y1, long x2, long y2)
 108         { DoDrawLine(x1, y1, x2, y2); }
 109     void DrawLine(const wxPoint& pt1, const wxPoint& pt2)
 110         { DoDrawLine(pt1.x, pt1.y, pt2.x, pt2.y); }
 111
 112     void CrossHair(long x, long y)
 113         { DoCrossHair(x, y); }
 114     void CrossHair(const wxPoint& pt)
 115         { DoCrossHair(pt.x, pt.y); }
 116
 117     void DrawArc(long x1, long y1, long x2, long y2, long xc, long yc)
 118         { DoDrawArc(x1, y1, x2, y2, xc, yc); }
 119     void DrawArc(const wxPoint& pt1, const wxPoint& pt2, const wxPoint& centre)
 120         { DoDrawArc(pt1.x, pt1.y, pt2.x, pt2.y, centre.x, centre.y); }
 121
 122     void DrawEllipticArc(long x, long y, long w, long h, double sa, double ea)
 123         { DoDrawEllipticArc(x, y, w, h, sa, ea); }
 124     void DrawEllipticArc(const wxPoint& pt, const wxSize& sz,
 125                          double sa, double ea)
 126         { DoDrawEllipticArc(pt.x, pt.y, sz.x, sz.y, sa, ea); }
 127
 128     void DrawPoint(long x, long y)
 129         { DoDrawPoint(x, y); }
 130     void DrawPoint(const wxPoint& pt)
 131         { DoDrawPoint(pt.x, pt.y); }
 132
 133     void DrawLines(int n, wxPoint points[], long xoffset = 0, long yoffset = 0)
 134         { DoDrawLines(n, points, xoffset, yoffset); }
 135     void DrawLines(const wxList *list, long xoffset = 0, long yoffset = 0);
 136
 137     void DrawPolygon(int n, wxPoint points[],
 138                      long xoffset = 0, long yoffset = 0,
 139                      int fillStyle = wxODDEVEN_RULE)
 140         { DoDrawPolygon(n, points, xoffset, yoffset, fillStyle); }
 141
 142     void DrawPolygon(const wxList *list,
 143                      long xoffset = 0, long yoffset = 0,
 144                      int fillStyle = wxODDEVEN_RULE);
 145
 146     void DrawRectangle(long x, long y, long width, long height)
 147         { DoDrawRectangle(x, y, width, height); }
 148     void DrawRectangle(const wxPoint& pt, const wxSize& sz)
 149         { DoDrawRectangle(pt.x, pt.y, sz.x, sz.y); }
 150     void DrawRectangle(const wxRect& rect)
 151         { DoDrawRectangle(rect.x, rect.y, rect.width, rect.height); }
 152
 153     void DrawRoundedRectangle(long x, long y, long width, long height,
 154                               double radius)
 155         { DoDrawRoundedRectangle(x, y, width, height, radius); }
 156     void DrawRoundedRectangle(const wxPoint& pt, const wxSize& sz,
 157                              double radius)
 158         { DoDrawRoundedRectangle(pt.x, pt.y, sz.x, sz.y, radius); }
 159     void DrawRoundedRectangle(const wxRect& r, double radius)
 160         { DoDrawRoundedRectangle(r.x, r.y, r.width, r.height, radius); }
 161
 162     void DrawCircle(long x, long y, long radius)
 163         { DoDrawEllipse(x - radius, y - radius, 2*radius, 2*radius); }
 164     void DrawEllipse(long x, long y, long width, long height)
 165         { DoDrawEllipse(x, y, width, height); }
 166     void DrawEllipse(const wxPoint& pt, const wxSize& sz)
 167         { DoDrawEllipse(pt.x, pt.y, sz.x, sz.y); }
 168     void DrawEllipse(const wxRect& rect)
 169         { DoDrawEllipse(rect.x, rect.y, rect.width, rect.height); }
 170
 171     void DrawIcon(const wxIcon& icon, long x, long y)
 172         { DoDrawIcon(icon, x, y); }
 173     void DrawIcon(const wxIcon& icon, const wxPoint& pt)
 174         { DoDrawIcon(icon, pt.x, pt.y); }
 175
 176     void DrawBitmap(const wxBitmap &bmp, long x, long y, bool useMask = FALSE)
 177         { DoDrawBitmap(bmp, x, y, useMask); }
 178     void DrawBitmap(const wxBitmap &bmp, const wxPoint& pt,
 179                     bool useMask = FALSE)
 180         { DoDrawBitmap(bmp, pt.x, pt.y, useMask); }
 181
 182     void DrawText(const wxString& text, long x, long y)
 183         { DoDrawText(text, x, y); }
 184     void DrawText(const wxString& text, const wxPoint& pt)
 185         { DoDrawText(text, pt.x, pt.y); }
 186
 187     bool Blit(long xdest, long ydest, long width, long height,
 188               wxDC *source, long xsrc, long ysrc,
 189               int rop = wxCOPY, bool useMask = FALSE)
 190     {
 191         return DoBlit(xdest, ydest, width, height,
 192                       source, xsrc, ysrc, rop, useMask);
 193     }
 194     bool Blit(const wxPoint& destPt, const wxSize& sz,
 195               wxDC *source, const wxPoint& srcPt,
 196               int rop = wxCOPY, bool useMask = FALSE)
 197     {
 198         return DoBlit(destPt.x, destPt.y, sz.x, sz.y,
 199                       source, srcPt.x, srcPt.y, rop, useMask);
 200     }
 201
 202 #if wxUSE_SPLINES
 203 // TODO: this API needs fixing (wxPointList, why (!const) "wxList *"?)
 204     void DrawSpline(long x1, long y1, long x2, long y2, long x3, long y3);
 205     void DrawSpline(int n, wxPoint points[]);
 206
 207     void DrawSpline(wxList *points) { DoDrawSpline(points); }
 208 #endif // wxUSE_SPLINES
 209
 210     // global DC operations
 211     // --------------------
 212
 213     virtual void Clear() = 0;
 214
 215     virtual bool StartDoc(const wxString& WXUNUSED(message)) { return TRUE; }
 216     virtual void EndDoc() { }
 217
 218     virtual void StartPage() { }
 219     virtual void EndPage() { }
 220
 221     // set objects to use for drawing
 222     // ------------------------------
 223
 224     virtual void SetFont(const wxFont& font) = 0;
 225     virtual void SetPen(const wxPen& pen) = 0;
 226     virtual void SetBrush(const wxBrush& brush) = 0;
 227     virtual void SetBackground(const wxBrush& brush) = 0;
 228     virtual void SetBackgroundMode(int mode) = 0;
 229     virtual void SetPalette(const wxPalette& palette) = 0;
 230
 231     // clipping region
 232     // ---------------
 233
 234     void SetClippingRegion(long x, long y, long width, long height)
 235         { DoSetClippingRegion(x, y, width, height); }
 236     void SetClippingRegion(const wxPoint& pt, const wxSize& sz)
 237         { DoSetClippingRegion(pt.x, pt.y, sz.x, sz.y); }
 238     void SetClippingRegion(const wxRect& rect)
 239         { DoSetClippingRegion(rect.x, rect.y, rect.width, rect.height); }
 240     void SetClippingRegion(const wxRegion& region)
 241         { DoSetClippingRegionAsRegion(region); }
 242
 243     virtual void DestroyClippingRegion() = 0;
 244
 245     void GetClippingBox(long *x, long *y, long *w, long *h) const
 246         { DoGetClippingBox(x, y, w, h); }
 247     void GetClippingBox(wxRect& rect) const
 248         { DoGetClippingBox(&rect.x, &rect.y, &rect.width, &rect.height); }
 249
 250     // text extent
 251     // -----------
 252
 253     virtual long GetCharHeight() const = 0;
 254     virtual long GetCharWidth() const = 0;
 255     virtual void GetTextExtent(const wxString& string,
 256                                long *x, long *y,
 257                                long *descent = NULL,
 258                                long *externalLeading = NULL,
 259                                wxFont *theFont = NULL) const = 0;
 260
 261     // size and resolution
 262     // -------------------
 263
 264     // in device units
 265     void GetSize(int *width, int *height) const
 266         { DoGetSize(width, height); }
 267     wxSize GetSize() const
 268     {
 269         int w, h;
 270         DoGetSize(&w, &h);
 271
 272         return wxSize(w, h);
 273     }
 274
 275     // in mm
 276     void GetSizeMM(int* width, int* height) const
 277         { DoGetSizeMM(width, height); }
 278     wxSize GetSizeMM() const
 279     {
 280         int w, h;
 281         DoGetSizeMM(&w, &h);
 282
 283         return wxSize(w, h);
 284     }
 285
 286     // coordinates conversions
 287     // -----------------------
 288
 289     // This group of functions does actual conversion of the input, as you'd
 290     // expect.
 291     long DeviceToLogicalX(long x) const;
 292     long DeviceToLogicalY(long y) const;
 293     long DeviceToLogicalXRel(long x) const;
 294     long DeviceToLogicalYRel(long y) const;
 295     long LogicalToDeviceX(long x) const;
 296     long LogicalToDeviceY(long y) const;
 297     long LogicalToDeviceXRel(long x) const;
 298     long LogicalToDeviceYRel(long y) const;
 299
 300     // query DC capabilities
 301     // ---------------------
 302
 303     virtual bool CanDrawBitmap() const = 0;
 304     virtual bool CanGetTextExtent() const = 0;
 305
 306     // colour depth
 307     virtual int GetDepth() const = 0;
 308
 309     // Resolution in Pixels per inch
 310     virtual wxSize GetPPI() const = 0;
 311
 312     virtual bool Ok() const { return m_ok; }
 313
 314     // accessors
 315     // ---------
 316
 317         // const...
 318     const wxBrush&  GetBackground() const { return m_backgroundBrush; }
 319     const wxBrush&  GetBrush() const { return m_brush; }
 320     const wxFont&   GetFont() const { return m_font; }
 321     const wxPen&    GetPen() const { return m_pen; }
 322     const wxColour& GetTextBackground() const { return m_textBackgroundColour; }
 323     const wxColour& GetTextForeground() const { return m_textForegroundColour; }
 324
 325         // ... and non const
 326     wxBrush&  GetBackground() { return m_backgroundBrush; }
 327     wxBrush&  GetBrush() { return m_brush; }
 328     wxFont&   GetFont() { return m_font; }
 329     wxPen&    GetPen() { return m_pen; }
 330     wxColour& GetTextBackground() { return m_textBackgroundColour; }
 331     wxColour& GetTextForeground() { return m_textForegroundColour; }
 332
 333     virtual void SetTextForeground(const wxColour& colour)
 334         { m_textForegroundColour = colour; }
 335     virtual void SetTextBackground(const wxColour& colour)
 336         { m_textBackgroundColour = colour; }
 337
 338     int GetMapMode() const { return m_mappingMode; }
 339     virtual void SetMapMode(int mode) = 0;
 340
 341     virtual void GetUserScale(double *x, double *y) const
 342     {
 343         if ( x ) *x = m_userScaleX;
 344         if ( y ) *y = m_userScaleY;
 345     }
 346     virtual void SetUserScale(double x, double y) = 0;
 347
 348     virtual void GetLogicalScale(double *x, double *y)
 349     {
 350         if ( x ) *x = m_logicalScaleX;
 351         if ( y ) *y = m_logicalScaleY;
 352     }
 353     virtual void SetLogicalScale(double x, double y)
 354     {
 355         m_logicalScaleX = x;
 356         m_logicalScaleY = y;
 357     }
 358
 359     void GetLogicalOrigin(long *x, long *y) const
 360         { DoGetLogicalOrigin(x, y); }
 361     wxPoint GetLogicalOrigin() const
 362         { long x, y; DoGetLogicalOrigin(&x, &y); return wxPoint(x, y); }
 363     virtual void SetLogicalOrigin(long x, long y) = 0;
 364
 365     void GetDeviceOrigin(long *x, long *y) const
 366         { DoGetDeviceOrigin(x, y); }
 367     wxPoint GetDeviceOrigin() const
 368         { long x, y; DoGetDeviceOrigin(&x, &y); return wxPoint(x, y); }
 369     virtual void SetDeviceOrigin(long x, long y) = 0;
 370
 371     virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp) = 0;
 372
 373     int GetLogicalFunction() const { return m_logicalFunction; }
 374     virtual void SetLogicalFunction(int function) = 0;
 375
 376     // Sometimes we need to override optimization, e.g. if other software is
 377     // drawing onto our surface and we can't be sure of who's done what.
 378     //
 379     // FIXME: is this (still) used?
 380     virtual void SetOptimization(bool WXUNUSED(opt)) { }
 381     virtual bool GetOptimization() { return FALSE; }
 382
 383     // bounding box
 384     // ------------
 385
 386     virtual void CalcBoundingBox(long x, long y)
 387     {
 388         if (x < m_minX) m_minX = x;
 389         if (y < m_minY) m_minY = y;
 390         if (x > m_maxX) m_maxX = x;
 391         if (y > m_maxY) m_maxY = y;
 392     }
 393
 394     // Get the final bounding box of the PostScript or Metafile picture.
 395     long MinX() const { return m_minX; }
 396     long MaxX() const { return m_maxX; }
 397     long MinY() const { return m_minY; }
 398     long MaxY() const { return m_maxY; }
 399
 400     // misc old functions
 401     // ------------------
 402
 403 #if WXWIN_COMPATIBILITY
 404     virtual void SetColourMap(const wxPalette& palette) { SetPalette(palette); }
 405     void GetTextExtent(const wxString& string, float *x, float *y,
 406             float *descent = NULL, float *externalLeading = NULL,
 407             wxFont *theFont = NULL, bool use16bit = FALSE) const ;
 408     void GetSize(float* width, float* height) const { int w, h; GetSize(& w, & h); *width = w; *height = h; }
 409     void GetSizeMM(float *width, float *height) const { long w, h; GetSizeMM(& w, & h); *width = (float) w; *height = (float) h; }
 410 #endif // WXWIN_COMPATIBILITY
 411
 412 protected:
 413     // the pure virtual functions which should be implemented by wxDC
 414     virtual void DoFloodFill(long x, long y, const wxColour& col,
 415                              int style = wxFLOOD_SURFACE) = 0;
 416
 417     virtual bool DoGetPixel(long x, long y, wxColour *col) const = 0;
 418
 419     virtual void DoDrawPoint(long x, long y) = 0;
 420     virtual void DoDrawLine(long x1, long y1, long x2, long y2) = 0;
 421
 422     virtual void DoDrawArc(long x1, long y1,
 423                            long x2, long y2,
 424                            long xc, long yc) = 0;
 425     virtual void DoDrawEllipticArc(long x, long y, long w, long h,
 426                                    double sa, double ea) = 0;
 427
 428     virtual void DoDrawRectangle(long x, long y, long width, long height) = 0;
 429     virtual void DoDrawRoundedRectangle(long x, long y,
 430                                         long width, long height,
 431                                         double radius) = 0;
 432     virtual void DoDrawEllipse(long x, long y, long width, long height) = 0;
 433
 434     virtual void DoCrossHair(long x, long y) = 0;
 435
 436     virtual void DoDrawIcon(const wxIcon& icon, long x, long y) = 0;
 437     virtual void DoDrawBitmap(const wxBitmap &bmp, long x, long y,
 438                               bool useMask = FALSE) = 0;
 439
 440     virtual void DoDrawText(const wxString& text, long x, long y) = 0;
 441
 442     virtual bool DoBlit(long xdest, long ydest, long width, long height,
 443                         wxDC *source, long xsrc, long ysrc,
 444                         int rop = wxCOPY, bool useMask = FALSE) = 0;
 445
 446     virtual void DoGetSize(int *width, int *height) const = 0;
 447     virtual void DoGetSizeMM(int* width, int* height) const = 0;
 448
 449     virtual void DoDrawLines(int n, wxPoint points[],
 450                              long xoffset, long yoffset) = 0;
 451     virtual void DoDrawPolygon(int n, wxPoint points[],
 452                                long xoffset, long yoffset,
 453                                int fillStyle = wxODDEVEN_RULE) = 0;
 454
 455     virtual void DoSetClippingRegionAsRegion(const wxRegion& region) = 0;
 456     virtual void DoSetClippingRegion(long x, long y,
 457                                      long width, long height) = 0;
 458
 459     // FIXME are these functions really different?
 460     virtual void DoGetClippingRegion(long *x, long *y,
 461                                      long *w, long *h)
 462         { DoGetClippingBox(x, y, w, h); }
 463     virtual void DoGetClippingBox(long *x, long *y,
 464                                   long *w, long *h) const
 465     {
 466         if ( m_clipping )
 467         {
 468             if ( x ) *x = m_clipX1;
 469             if ( y ) *y = m_clipY1;
 470             if ( w ) *w = m_clipX2 - m_clipX1;
 471             if ( h ) *h = m_clipY2 - m_clipY1;
 472         }
 473         else
 474         {
 475             *x = *y = *w = *h = 0;
 476         }
 477     }
 478
 479     virtual void DoGetLogicalOrigin(long *x, long *y) const
 480     {
 481         if ( x ) *x = m_logicalOriginX;
 482         if ( y ) *y = m_logicalOriginY;
 483     }
 484
 485     virtual void DoGetDeviceOrigin(long *x, long *y) const
 486     {
 487         if ( x ) *x = m_deviceOriginX;
 488         if ( y ) *y = m_deviceOriginY;
 489     }
 490
 491 #if wxUSE_SPLINES
 492     virtual void DoDrawSpline(wxList *points) = 0;
 493 #endif
 494
 495 protected:
 496     // flags
 497     bool m_colour:1;
 498     bool m_ok:1;
 499     bool m_clipping:1;
 500     bool m_isInteractive:1;
 501
 502     // coordinate system variables
 503
 504     // TODO short descriptions of what exactly they are would be nice...
 505
 506     long m_logicalOriginX, m_logicalOriginY;
 507     long m_deviceOriginX, m_deviceOriginY;
 508
 509     double m_logicalScaleX, m_logicalScaleY;
 510     double m_userScaleX, m_userScaleY;
 511     double m_scaleX, m_scaleY;
 512
 513     // Used by SetAxisOrientation() to invert the axes
 514     int m_signX, m_signY;
 515
 516     // bounding and clipping boxes
 517     long m_minX, m_minY, m_maxX, m_maxY;
 518     long m_clipX1, m_clipY1, m_clipX2, m_clipY2;
 519
 520     int m_logicalFunction;
 521     int m_backgroundMode;
 522     int m_mappingMode;
 523
 524     // GDI objects
 525     wxPen             m_pen;
 526     wxBrush           m_brush;
 527     wxBrush           m_backgroundBrush;
 528     wxColour          m_textForegroundColour;
 529     wxColour          m_textBackgroundColour;
 530     wxFont            m_font;
 531     wxPalette         m_palette;
 532
 533 private:
 534     DECLARE_NO_COPY_CLASS(wxDCBase);
 535 };
 536
 537 // ----------------------------------------------------------------------------
 538 // now include the declaration of wxDC class
 539 // ----------------------------------------------------------------------------
 540
 541 #if defined(__WXMSW__)
 542     #include "wx/msw/dc.h"
 543 #elif defined(__WXMOTIF__)
 544     #include "wx/motif/dc.h"
 545 #elif defined(__WXGTK__)
 546     #include "wx/gtk/dc.h"
 547 #elif defined(__WXQT__)
 548     #include "wx/qt/dc.h"
 549 #elif defined(__WXMAC__)
 550     #include "wx/mac/dc.h"
 551 #elif defined(__WXSTUBS__)
 552     #include "wx/stubs/dc.h"
 553 #endif
 554
 555 #endif
 556     // _WX_DC_H_BASE_