src/gtk/dcclient.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dcclient.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Created:     01/02/97
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 1998 Robert Roebling, Julian Smart and Markus Holzem
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 #ifdef __GNUG__
  12 #pragma implementation "dcclient.h"
  13 #endif
  14
  15 #include "wx/dcclient.h"
  16 #include "wx/dcmemory.h"
  17
  18 //-----------------------------------------------------------------------------
  19 // local data
  20 //-----------------------------------------------------------------------------
  21
  22 #include "bdiag.xbm"
  23 #include "fdiag.xbm"
  24 #include "cdiag.xbm"
  25 #include "horiz.xbm"
  26 #include "verti.xbm"
  27 #include "cross.xbm"
  28 #define  num_hatches 6
  29
  30 static GdkPixmap  *hatches[num_hatches];
  31 static GdkPixmap **hatch_bitmap = NULL;
  32
  33 //-----------------------------------------------------------------------------
  34 // constants
  35 //-----------------------------------------------------------------------------
  36
  37 #define RAD2DEG 57.2957795131
  38
  39 //-----------------------------------------------------------------------------
  40 // temporary implementation of the missing GDK function
  41 //-----------------------------------------------------------------------------
  42 #include "gdk/gdkprivate.h"
  43 void gdk_draw_bitmap     (GdkDrawable  *drawable,
  44                           GdkGC        *gc,
  45                           GdkDrawable  *src,
  46                           gint          xsrc,
  47                           gint          ysrc,
  48                           gint          xdest,
  49                           gint          ydest,
  50                           gint          width,
  51                           gint          height)
  52 {
  53   GdkWindowPrivate *drawable_private;
  54   GdkWindowPrivate *src_private;
  55   GdkGCPrivate *gc_private;
  56
  57   g_return_if_fail (drawable != NULL);
  58   g_return_if_fail (src != NULL);
  59   g_return_if_fail (gc != NULL);
  60
  61   drawable_private = (GdkWindowPrivate*) drawable;
  62   src_private = (GdkWindowPrivate*) src;
  63   if (drawable_private->destroyed || src_private->destroyed)
  64     return;
  65   gc_private = (GdkGCPrivate*) gc;
  66
  67   if (width == -1)
  68     width = src_private->width;
  69   if (height == -1)
  70     height = src_private->height;
  71
  72   XCopyPlane (drawable_private->xdisplay,
  73              src_private->xwindow,
  74              drawable_private->xwindow,
  75              gc_private->xgc,
  76              xsrc, ysrc,
  77              width, height,
  78              xdest, ydest,
  79              1);
  80 }
  81
  82 //-----------------------------------------------------------------------------
  83 // wxPaintDC
  84 //-----------------------------------------------------------------------------
  85
  86 IMPLEMENT_DYNAMIC_CLASS(wxPaintDC,wxDC)
  87
  88 wxPaintDC::wxPaintDC(void)
  89 {
  90   m_penGC = NULL;
  91   m_brushGC = NULL;
  92   m_textGC = NULL;
  93   m_bgGC = NULL;
  94   m_cmap = NULL;
  95 };
  96
  97 wxPaintDC::wxPaintDC( wxWindow *window )
  98 {
  99   m_penGC = NULL;
 100   m_brushGC = NULL;
 101   m_textGC = NULL;
 102   m_bgGC = NULL;
 103   m_cmap = NULL;
 104
 105   if (!window) return;
 106   GtkWidget *widget = window->m_wxwindow;
 107   if (!widget) return;
 108   m_window = widget->window;
 109   if (!m_window) return;
 110   if (window->m_wxwindow)
 111     m_cmap = gtk_widget_get_colormap( window->m_wxwindow );
 112   else
 113     m_cmap = gtk_widget_get_colormap( window->m_widget );
 114
 115   m_isDrawable = TRUE;
 116
 117   SetUpDC();
 118
 119   long x = 0;
 120   long y = 0;
 121   window->GetDrawingOffset( &x, &y );
 122   SetInternalDeviceOrigin( -x, -y );
 123 };
 124
 125 wxPaintDC::~wxPaintDC(void)
 126 {
 127 };
 128
 129 void wxPaintDC::FloodFill( long WXUNUSED(x1), long WXUNUSED(y1),
 130   wxColour *WXUNUSED(col), int WXUNUSED(style) )
 131 {
 132 };
 133
 134 bool wxPaintDC::GetPixel( long WXUNUSED(x1), long WXUNUSED(y1), wxColour *WXUNUSED(col) ) const
 135 {
 136   return FALSE;
 137 };
 138
 139 void wxPaintDC::DrawLine( long x1, long y1, long x2, long y2 )
 140 {
 141   if (!Ok()) return;
 142
 143   if (m_pen.GetStyle() != wxTRANSPARENT)
 144   {
 145     gdk_draw_line( m_window, m_penGC,
 146       XLOG2DEV(x1), YLOG2DEV(y1), XLOG2DEV(x2), YLOG2DEV(y2) );
 147   };
 148 };
 149
 150 void wxPaintDC::CrossHair( long x, long y )
 151 {
 152   if (!Ok()) return;
 153
 154   if (m_pen.GetStyle() != wxTRANSPARENT)
 155   {
 156     int w = 0;
 157     int h = 0;
 158     GetSize( &w, &h );
 159     long xx = XLOG2DEV(x);
 160     long yy = YLOG2DEV(y);
 161     gdk_draw_line( m_window, m_penGC,
 162       0, yy, XLOG2DEVREL(w), yy );
 163     gdk_draw_line( m_window, m_penGC,
 164       xx, 0, xx, YLOG2DEVREL(h) );
 165   };
 166 };
 167
 168 void wxPaintDC::DrawArc( long x1, long y1, long x2, long y2, double xc, double yc )
 169 {
 170   if (!Ok()) return;
 171
 172   long xx1 = XLOG2DEV(x1);
 173   long yy1 = YLOG2DEV(y1);
 174   long xx2 = XLOG2DEV(x2);
 175   long yy2 = YLOG2DEV(y2);
 176   long xxc = XLOG2DEV((long)xc);
 177   long yyc = YLOG2DEV((long)yc);
 178   double dx = xx1 - xxc;
 179   double dy = yy1 - yyc;
 180   double radius = sqrt(dx*dx+dy*dy);
 181   long   r      = (long)radius;
 182   double radius1, radius2;
 183
 184   if (xx1 == xx2 && yy1 == yy2)
 185   {
 186     radius1 = 0.0;
 187     radius2 = 360.0;
 188   }
 189   else
 190   if (radius == 0.0)
 191   {
 192     radius1 = radius2 = 0.0;
 193   }
 194   else
 195   {
 196     radius1 = (xx1 - xxc == 0) ?
 197             (yy1 - yyc < 0) ? 90.0 : -90.0 :
 198             -atan2(double(yy1-yyc), double(xx1-xxc)) * RAD2DEG;
 199     radius2 = (xx2 - xxc == 0) ?
 200             (yy2 - yyc < 0) ? 90.0 : -90.0 :
 201             -atan2(double(yy2-yyc), double(xx2-xxc)) * RAD2DEG;
 202   };
 203   long alpha1 = long(radius1 * 64.0);
 204   long alpha2 = long((radius2 - radius1) * 64.0);
 205   while (alpha2 <= 0) alpha2 += 360*64;
 206   while (alpha1 > 360*64) alpha1 -= 360*64;
 207
 208   if (m_brush.GetStyle() != wxTRANSPARENT)
 209     gdk_draw_arc( m_window, m_brushGC, TRUE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
 210
 211   if (m_pen.GetStyle() != wxTRANSPARENT)
 212     gdk_draw_arc( m_window, m_penGC, FALSE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
 213
 214 };
 215
 216 void wxPaintDC::DrawEllipticArc( long x, long y, long width, long height, double sa, double ea )
 217 {
 218   if (!Ok()) return;
 219
 220   long xx = XLOG2DEV(x);
 221   long yy = YLOG2DEV(y);
 222   long ww = m_signX * XLOG2DEVREL(width);
 223   long hh = m_signY * YLOG2DEVREL(height);
 224
 225   // CMB: handle -ve width and/or height
 226   if (ww < 0) { ww = -ww; xx = xx - ww; }
 227   if (hh < 0) { hh = -hh; yy = yy - hh; }
 228
 229   long start = long(sa * 64.0);
 230   long end = long(ea * 64.0);
 231   if (m_brush.GetStyle() != wxTRANSPARENT)
 232     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, start, end );
 233
 234   if (m_pen.GetStyle() != wxTRANSPARENT)
 235     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, ww, hh, start, end );
 236 };
 237
 238 void wxPaintDC::DrawPoint( long x, long y )
 239 {
 240   if (!Ok()) return;
 241
 242   if (m_pen.GetStyle() != wxTRANSPARENT)
 243     gdk_draw_point( m_window, m_penGC, XLOG2DEV(x), YLOG2DEV(y) );
 244 };
 245
 246 void wxPaintDC::DrawLines( int n, wxPoint points[], long xoffset, long yoffset )
 247 {
 248   if (!Ok()) return;
 249
 250   if (m_pen.GetStyle() == wxTRANSPARENT) return;
 251
 252   for (int i = 0; i < n-1; i++)
 253   {
 254     long x1 = XLOG2DEV(points[i].x + xoffset);
 255     long x2 = XLOG2DEV(points[i+1].x + xoffset);
 256     long y1 = YLOG2DEV(points[i].y + yoffset);     // oh, what a waste
 257     long y2 = YLOG2DEV(points[i+1].y + yoffset);
 258     gdk_draw_line( m_window, m_penGC, x1, y1, x2, y2 );
 259   };
 260 };
 261
 262 void wxPaintDC::DrawLines( wxList *points, long xoffset, long yoffset )
 263 {
 264   if (!Ok()) return;
 265
 266   if (m_pen.GetStyle() == wxTRANSPARENT) return;
 267
 268   wxNode *node = points->First();
 269   while (node->Next())
 270   {
 271     wxPoint *point = (wxPoint*)node->Data();
 272     wxPoint *npoint = (wxPoint*)node->Next()->Data();
 273     long x1 = XLOG2DEV(point->x + xoffset);
 274     long x2 = XLOG2DEV(npoint->x + xoffset);
 275     long y1 = YLOG2DEV(point->y + yoffset);    // and again...
 276     long y2 = YLOG2DEV(npoint->y + yoffset);
 277     gdk_draw_line( m_window, m_penGC, x1, y1, x2, y2 );
 278     node = node->Next();
 279   };
 280 };
 281
 282 void wxPaintDC::DrawPolygon( int n, wxPoint points[],
 283   long xoffset, long yoffset, int WXUNUSED(fillStyle) )
 284  {
 285    if (!Ok()) return;
 286    if (!n) return;    // Nothing to draw
 287    GdkPoint *gdkpoints = new GdkPoint[n+1];
 288    int i;
 289    for (i = 0 ; i < n ; i++)
 290      {
 291        gdkpoints[i].x = XLOG2DEV(points[i].x + xoffset);
 292        gdkpoints[i].y = YLOG2DEV(points[i].y + yoffset);
 293      }
 294    if (m_brush.GetStyle() != wxTRANSPARENT)
 295      gdk_draw_polygon (m_window, m_brushGC, TRUE, gdkpoints, n);
 296    // To do: Fillstyle
 297    if (m_pen.GetStyle() != wxTRANSPARENT)
 298      for (i = 0 ; i < n ; i++)
 299        gdk_draw_line( m_window, m_penGC,
 300                      gdkpoints[i%n].x,
 301                      gdkpoints[i%n].y,
 302                      gdkpoints[(i+1)%n].x,
 303                      gdkpoints[(i+1)%n].y);
 304    delete[] gdkpoints;
 305 };
 306
 307 void wxPaintDC::DrawPolygon( wxList *lines, long xoffset,
 308                               long yoffset, int WXUNUSED(fillStyle))
 309  {
 310    int n = lines->Number();
 311
 312    if (!Ok()) return;
 313    GdkPoint *gdkpoints = new GdkPoint[n];
 314    wxNode *node = lines->First();
 315    int cnt=0;
 316    while (node)
 317      {
 318        wxPoint *p = (wxPoint *) node->Data();
 319        gdkpoints[cnt].x = XLOG2DEV(p->x + xoffset);
 320        gdkpoints[cnt].y = YLOG2DEV(p->y + yoffset);
 321        node = node->Next();
 322        cnt++;
 323      }
 324    if (m_brush.GetStyle() != wxTRANSPARENT)
 325      gdk_draw_polygon (m_window, m_brushGC, TRUE, gdkpoints, n);
 326    // To do: Fillstyle
 327    if (m_pen.GetStyle() != wxTRANSPARENT)
 328      {
 329        int i;
 330        for (i = 0 ; i < n ; i++)
 331         gdk_draw_line( m_window, m_penGC,
 332                        gdkpoints[i%n].x,
 333                        gdkpoints[i%n].y,
 334                        gdkpoints[(i+1)%n].x,
 335                        gdkpoints[(i+1)%n].y);
 336      }
 337    delete[] gdkpoints;
 338 };
 339
 340 void wxPaintDC::DrawRectangle( long x, long y, long width, long height )
 341 {
 342   if (!Ok()) return;
 343
 344   long xx = XLOG2DEV(x);
 345   long yy = YLOG2DEV(y);
 346   long ww = m_signX * XLOG2DEVREL(width);
 347   long hh = m_signY * YLOG2DEVREL(height);
 348
 349   // CMB: draw nothing if transformed w or h is 0
 350   if (ww == 0 || hh == 0) return;
 351
 352   // CMB: handle -ve width and/or height
 353   if (ww < 0) { ww = -ww; xx = xx - ww; }
 354   if (hh < 0) { hh = -hh; yy = yy - hh; }
 355
 356   if (m_brush.GetStyle() != wxTRANSPARENT)
 357     gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy, ww, hh );
 358
 359   if (m_pen.GetStyle() != wxTRANSPARENT)
 360     gdk_draw_rectangle( m_window, m_penGC, FALSE, xx, yy, ww-1, hh-1 );
 361 };
 362
 363 void wxPaintDC::DrawRoundedRectangle( long x, long y, long width, long height, double radius )
 364 {
 365   if (!Ok()) return;
 366
 367   if (radius < 0.0) radius = - radius * ((width < height) ? width : height);
 368
 369   long xx = XLOG2DEV(x);
 370   long yy = YLOG2DEV(y);
 371   long ww = m_signX * XLOG2DEVREL(width);
 372   long hh = m_signY * YLOG2DEVREL(height);
 373   long rr = XLOG2DEVREL((long)radius);
 374
 375   // CMB: handle -ve width and/or height
 376   if (ww < 0) { ww = -ww; xx = xx - ww; }
 377   if (hh < 0) { hh = -hh; yy = yy - hh; }
 378
 379   // CMB: if radius is zero use DrawRectangle() instead to avoid
 380   // X drawing errors with small radii
 381   if (rr == 0)
 382   {
 383     DrawRectangle( x, y, width, height );
 384     return;
 385   }
 386
 387   // CMB: draw nothing if transformed w or h is 0
 388   if (ww == 0 || hh == 0) return;
 389
 390   // CMB: adjust size if outline is drawn otherwise the result is
 391   // 1 pixel too wide and high
 392   if (m_pen.GetStyle() != wxTRANSPARENT)
 393   {
 394     ww--;
 395     hh--;
 396   }
 397
 398   // CMB: ensure dd is not larger than rectangle otherwise we
 399   // get an hour glass shape
 400   long dd = 2 * rr;
 401   if (dd > ww) dd = ww;
 402   if (dd > hh) dd = hh;
 403   rr = dd / 2;
 404
 405   if (m_brush.GetStyle() != wxTRANSPARENT)
 406   {
 407     gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx+rr, yy, ww-dd+1, hh );
 408     gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy+rr, ww, hh-dd+1 );
 409     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, dd, dd, 90*64, 90*64 );
 410     gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
 411     gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
 412     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
 413   };
 414
 415   if (m_pen.GetStyle() != wxTRANSPARENT)
 416   {
 417     gdk_draw_line( m_window, m_penGC, xx+rr, yy, xx+ww-rr, yy );
 418     gdk_draw_line( m_window, m_penGC, xx+rr, yy+hh, xx+ww-rr, yy+hh );
 419     gdk_draw_line( m_window, m_penGC, xx, yy+rr, xx, yy+hh-rr );
 420     gdk_draw_line( m_window, m_penGC, xx+ww, yy+rr, xx+ww, yy+hh-rr );
 421     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, dd, dd, 90*64, 90*64 );
 422     gdk_draw_arc( m_window, m_penGC, FALSE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
 423     gdk_draw_arc( m_window, m_penGC, FALSE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
 424     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
 425   };
 426 };
 427
 428 void wxPaintDC::DrawEllipse( long x, long y, long width, long height )
 429 {
 430   if (!Ok()) return;
 431
 432   long xx = XLOG2DEV(x);
 433   long yy = YLOG2DEV(y);
 434   long ww = m_signX * XLOG2DEVREL(width);
 435   long hh = m_signY * YLOG2DEVREL(height);
 436
 437   // CMB: handle -ve width and/or height
 438   if (ww < 0) { ww = -ww; xx = xx - ww; }
 439   if (hh < 0) { hh = -hh; yy = yy - hh; }
 440
 441   if (m_brush.GetStyle() != wxTRANSPARENT)
 442     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, 0, 360*64 );
 443
 444   if (m_pen.GetStyle() != wxTRANSPARENT)
 445     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, ww, hh, 0, 360*64 );
 446 };
 447
 448 bool wxPaintDC::CanDrawBitmap(void) const
 449 {
 450   return TRUE;
 451 };
 452
 453 void wxPaintDC::DrawIcon( const wxIcon &icon, long x, long y, bool useMask )
 454 {
 455   if (!Ok()) return;
 456
 457   if (!icon.Ok()) return;
 458
 459   int xx = XLOG2DEV(x);
 460   int yy = YLOG2DEV(y);
 461
 462   GdkBitmap *mask = NULL;
 463   if (icon.GetMask()) mask = icon.GetMask()->GetBitmap();
 464
 465   if (useMask && mask)
 466   {
 467     gdk_gc_set_clip_mask( m_penGC, mask );
 468     gdk_gc_set_clip_origin( m_penGC, xx, yy );
 469   };
 470
 471   GdkPixmap *pm = icon.GetPixmap();
 472   gdk_draw_pixmap( m_window, m_penGC, pm, 0, 0, xx, yy, -1, -1 );
 473
 474   if (useMask && mask)
 475   {
 476     gdk_gc_set_clip_mask( m_penGC, NULL );
 477     gdk_gc_set_clip_origin( m_penGC, 0, 0 );
 478   };
 479 };
 480
 481 bool wxPaintDC::Blit( long xdest, long ydest, long width, long height,
 482        wxDC *source, long xsrc, long ysrc, int WXUNUSED(logical_func), bool WXUNUSED(useMask) )
 483 {
 484   if (!Ok()) return FALSE;
 485
 486   // CMB 20/5/98: add blitting of bitmaps
 487   if (source->IsKindOf(CLASSINFO(wxMemoryDC)))
 488   {
 489     wxMemoryDC* srcDC = (wxMemoryDC*)source;
 490         GdkBitmap* bmap = srcDC->m_selected.GetBitmap();
 491     if (bmap)
 492     {
 493       gdk_draw_bitmap (
 494           m_window,
 495           m_textGC,
 496           bmap,
 497           source->DeviceToLogicalX(xsrc), source->DeviceToLogicalY(ysrc),
 498           XLOG2DEV(xdest), YLOG2DEV(ydest),
 499           source->DeviceToLogicalXRel(width), source->DeviceToLogicalYRel(height)
 500           );
 501       return TRUE;
 502     }
 503   }
 504
 505   wxClientDC *csrc = (wxClientDC*)source;
 506   gdk_window_copy_area ( m_window, m_penGC,
 507     XLOG2DEV(xdest), YLOG2DEV(ydest),
 508     csrc->GetWindow(),
 509     source->DeviceToLogicalX(xsrc), source->DeviceToLogicalY(ysrc),
 510     source->DeviceToLogicalXRel(width), source->DeviceToLogicalYRel(height) );
 511
 512 /*
 513   gdk_window_copy_area ( m_window, m_penGC,
 514     XLOG2DEV(xdest), YLOG2DEV(ydest),
 515     csrc->GetWindow(),
 516     xsrc, ysrc,
 517     width, height );
 518 */
 519
 520   return TRUE;
 521 };
 522
 523 void wxPaintDC::DrawText( const wxString &text, long x, long y, bool
 524 WXUNUSED(use16) )
 525 {
 526   if (!Ok()) return;
 527
 528   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 529
 530   x = XLOG2DEV(x);
 531   y = YLOG2DEV(y);
 532
 533   // CMB 21/5/98: draw text background if mode is wxSOLID
 534   if (m_backgroundMode == wxSOLID)
 535   {
 536     long width = gdk_string_width( font, text );
 537     long height = font->ascent + font->descent;
 538     gdk_gc_set_foreground( m_textGC, m_textBackgroundColour.GetColor() );
 539     gdk_draw_rectangle( m_window, m_textGC, TRUE, x, y, width, height );
 540     gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );
 541   }
 542   gdk_draw_string( m_window, font, m_textGC, x, y + font->ascent, text );
 543
 544   // CMB 17/7/98: simple underline: ignores scaling and underlying
 545   // X font's XA_UNDERLINE_POSITION and XA_UNDERLINE_THICKNESS
 546   // properties (see wxXt implementation)
 547   if (m_font.GetUnderlined())
 548   {
 549     long width = gdk_string_width( font, text );
 550     long ul_y = y + font->ascent;
 551     if (font->descent > 0) ul_y++;
 552     gdk_draw_line( m_window, m_textGC, x, ul_y, x + width, ul_y);
 553   }
 554 };
 555
 556
 557
 558 bool wxPaintDC::CanGetTextExtent(void) const
 559 {
 560   return TRUE;
 561 };
 562
 563 void wxPaintDC::GetTextExtent( const wxString &string, long *width, long *height,
 564                      long *WXUNUSED(descent), long *WXUNUSED(externalLeading),
 565                      wxFont *WXUNUSED(theFont), bool WXUNUSED(use16) )
 566 {
 567   if (!Ok()) return;
 568
 569   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 570   if (width) (*width) = long(gdk_string_width( font, string ) / m_scaleX);
 571   if (height) (*height) = long((font->ascent + font->descent) / m_scaleY);
 572 };
 573
 574 long wxPaintDC::GetCharWidth(void)
 575 {
 576   if (!Ok()) return 0;
 577
 578   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 579   return gdk_string_width( font, "H" );
 580 };
 581
 582 long wxPaintDC::GetCharHeight(void)
 583 {
 584   if (!Ok()) return 0;
 585
 586   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 587   return font->ascent + font->descent;
 588 };
 589
 590 void wxPaintDC::Clear(void)
 591 {
 592   if (!Ok()) return;
 593
 594 //  DestroyClippingRegion();
 595
 596   if (m_isDrawable)
 597   {
 598     gdk_window_clear( m_window );
 599   }
 600   else
 601   {
 602     int width = 0;
 603     int height = 0;
 604     GetSize( &width, &height );
 605     gdk_draw_rectangle( m_window, m_bgGC, TRUE, 0, 0, width, height );
 606   };
 607 };
 608
 609 void wxPaintDC::SetFont( const wxFont &font )
 610 {
 611   if (!Ok()) return;
 612
 613   m_font = font;
 614 };
 615
 616 void wxPaintDC::SetPen( const wxPen &pen )
 617 {
 618   if (!Ok()) return;
 619
 620   if (m_pen == pen) return;
 621
 622   m_pen = pen;
 623
 624   if (!m_pen.Ok()) return;
 625
 626   gint width = m_pen.GetWidth();
 627   // CMB: if width is non-zero scale it with the dc
 628   if (width <= 0)
 629   {
 630     width = 1;
 631   }
 632   else
 633   {
 634     // X doesn't allow different width in x and y and so we take
 635     // the average
 636     double w = 0.5 + (abs(XLOG2DEVREL(width)) + abs(YLOG2DEVREL(width))) / 2.0;
 637     width = (int)w;
 638   }
 639
 640   GdkLineStyle lineStyle = GDK_LINE_SOLID;
 641   switch (m_pen.GetStyle())
 642   {
 643     case wxSOLID:      { lineStyle = GDK_LINE_SOLID;       break; };
 644     case wxDOT:        { lineStyle = GDK_LINE_ON_OFF_DASH; break; };
 645     case wxLONG_DASH:  { lineStyle = GDK_LINE_ON_OFF_DASH; break; };
 646     case wxSHORT_DASH: { lineStyle = GDK_LINE_ON_OFF_DASH; break; };
 647     case wxDOT_DASH:   { lineStyle = GDK_LINE_DOUBLE_DASH; break; };
 648   };
 649
 650   GdkCapStyle capStyle = GDK_CAP_ROUND;
 651   switch (m_pen.GetCap())
 652   {
 653     case wxCAP_ROUND:      { capStyle = (width <= 1) ? GDK_CAP_NOT_LAST : GDK_CAP_ROUND; break; };
 654     case wxCAP_PROJECTING: { capStyle = GDK_CAP_PROJECTING; break; };
 655     case wxCAP_BUTT:       { capStyle = GDK_CAP_BUTT;       break; };
 656   };
 657
 658   GdkJoinStyle joinStyle = GDK_JOIN_ROUND;
 659   switch (m_pen.GetJoin())
 660   {
 661     case wxJOIN_BEVEL: { joinStyle = GDK_JOIN_BEVEL; break; };
 662     case wxJOIN_ROUND: { joinStyle = GDK_JOIN_ROUND; break; };
 663     case wxJOIN_MITER: { joinStyle = GDK_JOIN_MITER; break; };
 664   };
 665
 666   gdk_gc_set_line_attributes( m_penGC, width, lineStyle, capStyle, joinStyle );
 667
 668   m_pen.GetColour().CalcPixel( m_cmap );
 669   gdk_gc_set_foreground( m_penGC, m_pen.GetColour().GetColor() );
 670 };
 671
 672 void wxPaintDC::SetBrush( const wxBrush &brush )
 673 {
 674   if (!Ok()) return;
 675
 676   if (m_brush == brush) return;
 677
 678   m_brush = brush;
 679
 680   if (!m_brush.Ok()) return;
 681
 682   m_brush.GetColour().CalcPixel( m_cmap );
 683   gdk_gc_set_foreground( m_brushGC, m_brush.GetColour().GetColor() );
 684
 685   GdkFill fillStyle = GDK_SOLID;
 686   switch (m_brush.GetStyle())
 687   {
 688     case wxSOLID:
 689     case wxTRANSPARENT:
 690       break;
 691     default:
 692       fillStyle = GDK_STIPPLED;
 693   };
 694
 695   gdk_gc_set_fill( m_brushGC, fillStyle );
 696
 697   if (m_brush.GetStyle() == wxSTIPPLE)
 698   {
 699     gdk_gc_set_stipple( m_brushGC, m_brush.GetStipple()->GetPixmap() );
 700   };
 701
 702   if (IS_HATCH(m_brush.GetStyle()))
 703   {
 704     int num = m_brush.GetStyle() - wxBDIAGONAL_HATCH;
 705     gdk_gc_set_stipple( m_brushGC, hatches[num] );
 706   };
 707 };
 708
 709 // CMB 21/7/98: Added SetBackground. Sets background brush
 710 // for Clear() and bg colour for shapes filled with cross-hatch brush
 711 void wxPaintDC::SetBackground( const wxBrush &brush )
 712 {
 713   if (!Ok()) return;
 714
 715   if (m_backgroundBrush == brush) return;
 716
 717   m_backgroundBrush = brush;
 718
 719   if (!m_backgroundBrush.Ok()) return;
 720
 721   m_backgroundBrush.GetColour().CalcPixel( m_cmap );
 722   gdk_gc_set_background( m_brushGC, m_backgroundBrush.GetColour().GetColor() );
 723   gdk_gc_set_foreground( m_bgGC, m_backgroundBrush.GetColour().GetColor() );
 724
 725   GdkFill fillStyle = GDK_SOLID;
 726   switch (m_backgroundBrush.GetStyle())
 727   {
 728     case wxSOLID:
 729     case wxTRANSPARENT:
 730       break;
 731     default:
 732       fillStyle = GDK_STIPPLED;
 733   };
 734
 735   gdk_gc_set_fill( m_bgGC, fillStyle );
 736
 737   if (m_backgroundBrush.GetStyle() == wxSTIPPLE)
 738   {
 739     gdk_gc_set_stipple( m_bgGC, m_backgroundBrush.GetStipple()->GetPixmap() );
 740   };
 741
 742   if (IS_HATCH(m_backgroundBrush.GetStyle()))
 743   {
 744     int num = m_backgroundBrush.GetStyle() - wxBDIAGONAL_HATCH;
 745     gdk_gc_set_stipple( m_bgGC, hatches[num] );
 746   };
 747 };
 748
 749 void wxPaintDC::SetLogicalFunction( int function )
 750 {
 751   if (m_logicalFunction == function) return;
 752   GdkFunction mode = GDK_COPY;
 753   switch (function)
 754   {
 755     case wxXOR:    mode = GDK_INVERT; break;
 756     case wxINVERT: mode = GDK_INVERT; break;
 757     default:       break;
 758   };
 759   m_logicalFunction = function;
 760   gdk_gc_set_function( m_penGC, mode );
 761   gdk_gc_set_function( m_brushGC, mode );
 762 };
 763
 764 void wxPaintDC::SetTextForeground( const wxColour &col )
 765 {
 766   if (!Ok()) return;
 767
 768   if (m_textForegroundColour == col) return;
 769
 770   m_textForegroundColour = col;
 771   if (!m_textForegroundColour.Ok()) return;
 772
 773   m_textForegroundColour.CalcPixel( m_cmap );
 774   gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );
 775 };
 776
 777 void wxPaintDC::SetTextBackground( const wxColour &col )
 778 {
 779   if (!Ok()) return;
 780
 781   if (m_textBackgroundColour == col) return;
 782
 783   m_textBackgroundColour = col;
 784   if (!m_textBackgroundColour.Ok()) return;
 785
 786   m_textBackgroundColour.CalcPixel( m_cmap );
 787   gdk_gc_set_background( m_textGC, m_textBackgroundColour.GetColor() );
 788 };
 789
 790 void wxPaintDC::SetBackgroundMode( int mode )
 791 {
 792   m_backgroundMode = mode;
 793
 794   // CMB 21/7/98: fill style of cross-hatch brushes is affected by
 795   // transparent/solid background mode
 796   if (m_brush.GetStyle() != wxSOLID && m_brush.GetStyle() != wxTRANSPARENT)
 797   {
 798     gdk_gc_set_fill( m_brushGC,
 799       (m_backgroundMode == wxTRANSPARENT) ? GDK_STIPPLED : GDK_OPAQUE_STIPPLED);
 800   }
 801 };
 802
 803 void wxPaintDC::SetPalette( const wxPalette& WXUNUSED(palette) )
 804 {
 805 };
 806
 807 void wxPaintDC::SetClippingRegion( long x, long y, long width, long height )
 808 {
 809   wxDC::SetClippingRegion( x, y, width, height );
 810
 811   GdkRectangle rect;
 812   rect.x = XLOG2DEV(x);
 813   rect.y = YLOG2DEV(y);
 814   rect.width = XLOG2DEV(x+width);
 815   rect.height = YLOG2DEV(y+height);
 816   gdk_gc_set_clip_rectangle( m_penGC, &rect );
 817   gdk_gc_set_clip_rectangle( m_brushGC, &rect );
 818   gdk_gc_set_clip_rectangle( m_textGC, &rect );
 819   gdk_gc_set_clip_rectangle( m_bgGC, &rect );
 820
 821 };
 822
 823 void wxPaintDC::DestroyClippingRegion(void)
 824 {
 825   wxDC::DestroyClippingRegion();
 826
 827   gdk_gc_set_clip_rectangle( m_penGC, NULL );
 828   gdk_gc_set_clip_rectangle( m_brushGC, NULL );
 829   gdk_gc_set_clip_rectangle( m_textGC, NULL );
 830   gdk_gc_set_clip_rectangle( m_bgGC, NULL );
 831 };
 832
 833 void wxPaintDC::SetUpDC(void)
 834 {
 835   m_ok = TRUE;
 836   m_logicalFunction = wxCOPY;
 837   if (m_penGC) gdk_gc_unref( m_penGC );
 838   m_penGC = gdk_gc_new( m_window );
 839   if (m_brushGC) gdk_gc_unref( m_brushGC );
 840   m_brushGC = gdk_gc_new( m_window );
 841   if (m_textGC) gdk_gc_unref( m_textGC );
 842   m_textGC = gdk_gc_new( m_window );
 843   if (m_bgGC) gdk_gc_unref( m_bgGC );
 844   m_bgGC = gdk_gc_new( m_window );
 845   SetTextForeground( m_textForegroundColour );
 846   SetTextBackground( m_textBackgroundColour );
 847   SetPen( m_pen );
 848   SetFont( m_font );
 849   SetBrush( m_brush );
 850
 851   gdk_gc_set_background( m_penGC, wxWHITE->GetColor() );
 852
 853   if (!hatch_bitmap)
 854   {
 855     hatch_bitmap    = hatches;
 856     hatch_bitmap[0] = gdk_bitmap_create_from_data( NULL, bdiag_bits, bdiag_width, bdiag_height );
 857     hatch_bitmap[1] = gdk_bitmap_create_from_data( NULL, cdiag_bits, cdiag_width, cdiag_height );
 858     hatch_bitmap[2] = gdk_bitmap_create_from_data( NULL, fdiag_bits, fdiag_width, fdiag_height );
 859     hatch_bitmap[3] = gdk_bitmap_create_from_data( NULL, cross_bits, cross_width, cross_height );
 860     hatch_bitmap[4] = gdk_bitmap_create_from_data( NULL, horiz_bits, horiz_width, horiz_height );
 861     hatch_bitmap[5] = gdk_bitmap_create_from_data( NULL, verti_bits, verti_width, verti_height );
 862   };
 863 };
 864
 865 GdkWindow *wxPaintDC::GetWindow(void)
 866 {
 867   return m_window;
 868 };
 869
 870 // ----------------------------------- spline code ----------------------------------------
 871
 872 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
 873                          double a3, double b3, double a4, double b4);
 874 void wx_clear_stack(void);
 875 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
 876         double *y3, double *x4, double *y4);
 877 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
 878           double x4, double y4);
 879 static bool wx_spline_add_point(double x, double y);
 880 static void wx_spline_draw_point_array(wxDC *dc);
 881
 882 wxList wx_spline_point_list;
 883
 884 #define         half(z1, z2)    ((z1+z2)/2.0)
 885 #define         THRESHOLD       5
 886
 887 /* iterative version */
 888
 889 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
 890                  double b4)
 891 {
 892     register double  xmid, ymid;
 893     double           x1, y1, x2, y2, x3, y3, x4, y4;
 894
 895     wx_clear_stack();
 896     wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
 897
 898     while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
 899         xmid = (double)half(x2, x3);
 900         ymid = (double)half(y2, y3);
 901         if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
 902             fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
 903             wx_spline_add_point( x1, y1 );
 904             wx_spline_add_point( xmid, ymid );
 905         } else {
 906             wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
 907                  (double)half(x3, x4), (double)half(y3, y4), x4, y4);
 908             wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
 909                  (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
 910         }
 911     }
 912 }
 913
 914 /* utilities used by spline drawing routines */
 915
 916 typedef struct wx_spline_stack_struct {
 917     double           x1, y1, x2, y2, x3, y3, x4, y4;
 918 } Stack;
 919
 920 #define         SPLINE_STACK_DEPTH             20
 921 static Stack    wx_spline_stack[SPLINE_STACK_DEPTH];
 922 static Stack   *wx_stack_top;
 923 static int      wx_stack_count;
 924
 925 void wx_clear_stack(void)
 926 {
 927     wx_stack_top = wx_spline_stack;
 928     wx_stack_count = 0;
 929 }
 930
 931 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
 932 {
 933     wx_stack_top->x1 = x1;
 934     wx_stack_top->y1 = y1;
 935     wx_stack_top->x2 = x2;
 936     wx_stack_top->y2 = y2;
 937     wx_stack_top->x3 = x3;
 938     wx_stack_top->y3 = y3;
 939     wx_stack_top->x4 = x4;
 940     wx_stack_top->y4 = y4;
 941     wx_stack_top++;
 942     wx_stack_count++;
 943 }
 944
 945 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
 946                   double *x3, double *y3, double *x4, double *y4)
 947 {
 948     if (wx_stack_count == 0)
 949         return (0);
 950     wx_stack_top--;
 951     wx_stack_count--;
 952     *x1 = wx_stack_top->x1;
 953     *y1 = wx_stack_top->y1;
 954     *x2 = wx_stack_top->x2;
 955     *y2 = wx_stack_top->y2;
 956     *x3 = wx_stack_top->x3;
 957     *y3 = wx_stack_top->y3;
 958     *x4 = wx_stack_top->x4;
 959     *y4 = wx_stack_top->y4;
 960     return (1);
 961 }
 962
 963 static bool wx_spline_add_point(double x, double y)
 964 {
 965   wxPoint *point = new wxPoint ;
 966   point->x = (int) x;
 967   point->y = (int) y;
 968   wx_spline_point_list.Append((wxObject*)point);
 969   return TRUE;
 970 }
 971
 972 static void wx_spline_draw_point_array(wxDC *dc)
 973 {
 974   dc->DrawLines(&wx_spline_point_list, 0, 0 );
 975   wxNode *node = wx_spline_point_list.First();
 976   while (node)
 977   {
 978     wxPoint *point = (wxPoint *)node->Data();
 979     delete point;
 980     delete node;
 981     node = wx_spline_point_list.First();
 982   }
 983 }
 984
 985 void wxPaintDC::DrawOpenSpline( wxList *points )
 986 {
 987     wxPoint *p;
 988     double           cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
 989     double           x1, y1, x2, y2;
 990
 991     wxNode *node = points->First();
 992     p = (wxPoint *)node->Data();
 993
 994     x1 = p->x;
 995     y1 = p->y;
 996
 997     node = node->Next();
 998     p = (wxPoint *)node->Data();
 999
1000     x2 = p->x;
1001     y2 = p->y;
1002     cx1 = (double)((x1 + x2) / 2);
1003     cy1 = (double)((y1 + y2) / 2);
1004     cx2 = (double)((cx1 + x2) / 2);
1005     cy2 = (double)((cy1 + y2) / 2);
1006
1007     wx_spline_add_point(x1, y1);
1008
1009     while ((node = node->Next()) != NULL)
1010     {
1011         p = (wxPoint *)node->Data();
1012         x1 = x2;
1013         y1 = y2;
1014         x2 = p->x;
1015         y2 = p->y;
1016         cx4 = (double)(x1 + x2) / 2;
1017         cy4 = (double)(y1 + y2) / 2;
1018         cx3 = (double)(x1 + cx4) / 2;
1019         cy3 = (double)(y1 + cy4) / 2;
1020
1021         wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
1022
1023         cx1 = cx4;
1024         cy1 = cy4;
1025         cx2 = (double)(cx1 + x2) / 2;
1026         cy2 = (double)(cy1 + y2) / 2;
1027     }
1028
1029     wx_spline_add_point( cx1, cy1 );
1030     wx_spline_add_point( x2, y2 );
1031
1032     wx_spline_draw_point_array( this );
1033 };