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 = (GdkPixmap **) 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 = (GdkGC *) NULL;
  91   m_brushGC = (GdkGC *) NULL;
  92   m_textGC = (GdkGC *) NULL;
  93   m_bgGC = (GdkGC *) NULL;
  94   m_cmap = (GdkColormap *) NULL;
  95   m_isMemDC = FALSE;
  96 }
  97
  98 wxPaintDC::wxPaintDC( wxWindow *window )
  99 {
 100   m_penGC = (GdkGC *) NULL;
 101   m_brushGC = (GdkGC *) NULL;
 102   m_textGC = (GdkGC *) NULL;
 103   m_bgGC = (GdkGC *) NULL;
 104   m_cmap = (GdkColormap *) NULL;
 105
 106   if (!window) return;
 107   GtkWidget *widget = window->m_wxwindow;
 108   if (!widget) return;
 109   m_window = widget->window;
 110   if (!m_window) return;
 111   if (window->m_wxwindow)
 112     m_cmap = gtk_widget_get_colormap( window->m_wxwindow );
 113   else
 114     m_cmap = gtk_widget_get_colormap( window->m_widget );
 115
 116   m_isMemDC = FALSE;
 117
 118   SetUpDC();
 119 }
 120
 121 wxPaintDC::~wxPaintDC(void)
 122 {
 123 }
 124
 125 void wxPaintDC::FloodFill( long WXUNUSED(x1), long WXUNUSED(y1),
 126   wxColour *WXUNUSED(col), int WXUNUSED(style) )
 127 {
 128   wxFAIL_MSG( "wxPaintDC::FloodFill not implemented" );
 129 }
 130
 131 bool wxPaintDC::GetPixel( long WXUNUSED(x1), long WXUNUSED(y1), wxColour *WXUNUSED(col) ) const
 132 {
 133   wxFAIL_MSG( "wxPaintDC::GetPixel not implemented" );
 134   return FALSE;
 135 }
 136
 137 void wxPaintDC::DrawLine( long x1, long y1, long x2, long y2 )
 138 {
 139   if (!Ok()) return;
 140
 141   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 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_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 155
 156   if (m_pen.GetStyle() != wxTRANSPARENT)
 157   {
 158     int w = 0;
 159     int h = 0;
 160     GetSize( &w, &h );
 161     long xx = XLOG2DEV(x);
 162     long yy = YLOG2DEV(y);
 163     gdk_draw_line( m_window, m_penGC,
 164       0, yy, XLOG2DEVREL(w), yy );
 165     gdk_draw_line( m_window, m_penGC,
 166       xx, 0, xx, YLOG2DEVREL(h) );
 167   }
 168 }
 169
 170 void wxPaintDC::DrawArc( long x1, long y1, long x2, long y2, double xc, double yc )
 171 {
 172   if (!Ok()) return;
 173
 174   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 175
 176   long xx1 = XLOG2DEV(x1);
 177   long yy1 = YLOG2DEV(y1);
 178   long xx2 = XLOG2DEV(x2);
 179   long yy2 = YLOG2DEV(y2);
 180   long xxc = XLOG2DEV((long)xc);
 181   long yyc = YLOG2DEV((long)yc);
 182   double dx = xx1 - xxc;
 183   double dy = yy1 - yyc;
 184   double radius = sqrt(dx*dx+dy*dy);
 185   long   r      = (long)radius;
 186   double radius1, radius2;
 187
 188   if (xx1 == xx2 && yy1 == yy2)
 189   {
 190     radius1 = 0.0;
 191     radius2 = 360.0;
 192   }
 193   else
 194   if (radius == 0.0)
 195   {
 196     radius1 = radius2 = 0.0;
 197   }
 198   else
 199   {
 200     radius1 = (xx1 - xxc == 0) ?
 201             (yy1 - yyc < 0) ? 90.0 : -90.0 :
 202             -atan2(double(yy1-yyc), double(xx1-xxc)) * RAD2DEG;
 203     radius2 = (xx2 - xxc == 0) ?
 204             (yy2 - yyc < 0) ? 90.0 : -90.0 :
 205             -atan2(double(yy2-yyc), double(xx2-xxc)) * RAD2DEG;
 206   }
 207   long alpha1 = long(radius1 * 64.0);
 208   long alpha2 = long((radius2 - radius1) * 64.0);
 209   while (alpha2 <= 0) alpha2 += 360*64;
 210   while (alpha1 > 360*64) alpha1 -= 360*64;
 211
 212   if (m_brush.GetStyle() != wxTRANSPARENT)
 213     gdk_draw_arc( m_window, m_brushGC, TRUE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
 214
 215   if (m_pen.GetStyle() != wxTRANSPARENT)
 216     gdk_draw_arc( m_window, m_penGC, FALSE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
 217
 218 }
 219
 220 void wxPaintDC::DrawEllipticArc( long x, long y, long width, long height, double sa, double ea )
 221 {
 222   if (!Ok()) return;
 223
 224   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 225
 226   long xx = XLOG2DEV(x);
 227   long yy = YLOG2DEV(y);
 228   long ww = m_signX * XLOG2DEVREL(width);
 229   long hh = m_signY * YLOG2DEVREL(height);
 230
 231   // CMB: handle -ve width and/or height
 232   if (ww < 0) { ww = -ww; xx = xx - ww; }
 233   if (hh < 0) { hh = -hh; yy = yy - hh; }
 234
 235   long start = long(sa * 64.0);
 236   long end = long(ea * 64.0);
 237   if (m_brush.GetStyle() != wxTRANSPARENT)
 238     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, start, end );
 239
 240   if (m_pen.GetStyle() != wxTRANSPARENT)
 241     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, ww, hh, start, end );
 242 }
 243
 244 void wxPaintDC::DrawPoint( long x, long y )
 245 {
 246   if (!Ok()) return;
 247
 248   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 249
 250   if (m_pen.GetStyle() != wxTRANSPARENT)
 251     gdk_draw_point( m_window, m_penGC, XLOG2DEV(x), YLOG2DEV(y) );
 252 }
 253
 254 void wxPaintDC::DrawLines( int n, wxPoint points[], long xoffset, long yoffset )
 255 {
 256   if (!Ok()) return;
 257
 258   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 259
 260   if (m_pen.GetStyle() == wxTRANSPARENT) return;
 261
 262   for (int i = 0; i < n-1; i++)
 263   {
 264     long x1 = XLOG2DEV(points[i].x + xoffset);
 265     long x2 = XLOG2DEV(points[i+1].x + xoffset);
 266     long y1 = YLOG2DEV(points[i].y + yoffset);     // oh, what a waste
 267     long y2 = YLOG2DEV(points[i+1].y + yoffset);
 268     gdk_draw_line( m_window, m_penGC, x1, y1, x2, y2 );
 269   }
 270 }
 271
 272 void wxPaintDC::DrawLines( wxList *points, long xoffset, long yoffset )
 273 {
 274   if (!Ok()) return;
 275
 276   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 277
 278   if (m_pen.GetStyle() == wxTRANSPARENT) return;
 279
 280   wxNode *node = points->First();
 281   while (node->Next())
 282   {
 283     wxPoint *point = (wxPoint*)node->Data();
 284     wxPoint *npoint = (wxPoint*)node->Next()->Data();
 285     long x1 = XLOG2DEV(point->x + xoffset);
 286     long x2 = XLOG2DEV(npoint->x + xoffset);
 287     long y1 = YLOG2DEV(point->y + yoffset);    // and again...
 288     long y2 = YLOG2DEV(npoint->y + yoffset);
 289     gdk_draw_line( m_window, m_penGC, x1, y1, x2, y2 );
 290     node = node->Next();
 291   }
 292 }
 293
 294 void wxPaintDC::DrawPolygon( int n, wxPoint points[], long xoffset, long yoffset, int WXUNUSED(fillStyle) )
 295 {
 296   if (!Ok()) return;
 297
 298   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 299
 300    if (!n) return;    // Nothing to draw
 301    GdkPoint *gdkpoints = new GdkPoint[n+1];
 302    int i;
 303    for (i = 0 ; i < n ; i++)
 304      {
 305        gdkpoints[i].x = XLOG2DEV(points[i].x + xoffset);
 306        gdkpoints[i].y = YLOG2DEV(points[i].y + yoffset);
 307      }
 308    if (m_brush.GetStyle() != wxTRANSPARENT)
 309      gdk_draw_polygon (m_window, m_brushGC, TRUE, gdkpoints, n);
 310    // To do: Fillstyle
 311    if (m_pen.GetStyle() != wxTRANSPARENT)
 312      for (i = 0 ; i < n ; i++)
 313        gdk_draw_line( m_window, m_penGC,
 314                      gdkpoints[i%n].x,
 315                      gdkpoints[i%n].y,
 316                      gdkpoints[(i+1)%n].x,
 317                      gdkpoints[(i+1)%n].y);
 318    delete[] gdkpoints;
 319 }
 320
 321 void wxPaintDC::DrawPolygon( wxList *lines, long xoffset, long yoffset, int WXUNUSED(fillStyle))
 322 {
 323   if (!Ok()) return;
 324
 325   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 326
 327    int n = lines->Number();
 328    GdkPoint *gdkpoints = new GdkPoint[n];
 329    wxNode *node = lines->First();
 330    int cnt=0;
 331    while (node)
 332      {
 333        wxPoint *p = (wxPoint *) node->Data();
 334        gdkpoints[cnt].x = XLOG2DEV(p->x + xoffset);
 335        gdkpoints[cnt].y = YLOG2DEV(p->y + yoffset);
 336        node = node->Next();
 337        cnt++;
 338      }
 339    if (m_brush.GetStyle() != wxTRANSPARENT)
 340      gdk_draw_polygon (m_window, m_brushGC, TRUE, gdkpoints, n);
 341    // To do: Fillstyle
 342    if (m_pen.GetStyle() != wxTRANSPARENT)
 343      {
 344        int i;
 345        for (i = 0 ; i < n ; i++)
 346         gdk_draw_line( m_window, m_penGC,
 347                        gdkpoints[i%n].x,
 348                        gdkpoints[i%n].y,
 349                        gdkpoints[(i+1)%n].x,
 350                        gdkpoints[(i+1)%n].y);
 351      }
 352    delete[] gdkpoints;
 353 }
 354
 355 void wxPaintDC::DrawRectangle( long x, long y, long width, long height )
 356 {
 357   if (!Ok()) return;
 358
 359   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 360
 361   long xx = XLOG2DEV(x);
 362   long yy = YLOG2DEV(y);
 363   long ww = m_signX * XLOG2DEVREL(width);
 364   long hh = m_signY * YLOG2DEVREL(height);
 365
 366   // CMB: draw nothing if transformed w or h is 0
 367   if (ww == 0 || hh == 0) return;
 368
 369   // CMB: handle -ve width and/or height
 370   if (ww < 0) { ww = -ww; xx = xx - ww; }
 371   if (hh < 0) { hh = -hh; yy = yy - hh; }
 372
 373   if (m_brush.GetStyle() != wxTRANSPARENT)
 374     gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy, ww, hh );
 375
 376   if (m_pen.GetStyle() != wxTRANSPARENT)
 377     gdk_draw_rectangle( m_window, m_penGC, FALSE, xx, yy, ww-1, hh-1 );
 378 }
 379
 380 void wxPaintDC::DrawRoundedRectangle( long x, long y, long width, long height, double radius )
 381 {
 382   if (!Ok()) return;
 383
 384   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 385
 386   if (radius < 0.0) radius = - radius * ((width < height) ? width : height);
 387
 388   long xx = XLOG2DEV(x);
 389   long yy = YLOG2DEV(y);
 390   long ww = m_signX * XLOG2DEVREL(width);
 391   long hh = m_signY * YLOG2DEVREL(height);
 392   long rr = XLOG2DEVREL((long)radius);
 393
 394   // CMB: handle -ve width and/or height
 395   if (ww < 0) { ww = -ww; xx = xx - ww; }
 396   if (hh < 0) { hh = -hh; yy = yy - hh; }
 397
 398   // CMB: if radius is zero use DrawRectangle() instead to avoid
 399   // X drawing errors with small radii
 400   if (rr == 0)
 401   {
 402     DrawRectangle( x, y, width, height );
 403     return;
 404   }
 405
 406   // CMB: draw nothing if transformed w or h is 0
 407   if (ww == 0 || hh == 0) return;
 408
 409   // CMB: adjust size if outline is drawn otherwise the result is
 410   // 1 pixel too wide and high
 411   if (m_pen.GetStyle() != wxTRANSPARENT)
 412   {
 413     ww--;
 414     hh--;
 415   }
 416
 417   // CMB: ensure dd is not larger than rectangle otherwise we
 418   // get an hour glass shape
 419   long dd = 2 * rr;
 420   if (dd > ww) dd = ww;
 421   if (dd > hh) dd = hh;
 422   rr = dd / 2;
 423
 424   if (m_brush.GetStyle() != wxTRANSPARENT)
 425   {
 426     gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx+rr, yy, ww-dd+1, hh );
 427     gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy+rr, ww, hh-dd+1 );
 428     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, dd, dd, 90*64, 90*64 );
 429     gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
 430     gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
 431     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
 432   }
 433
 434   if (m_pen.GetStyle() != wxTRANSPARENT)
 435   {
 436     gdk_draw_line( m_window, m_penGC, xx+rr, yy, xx+ww-rr, yy );
 437     gdk_draw_line( m_window, m_penGC, xx+rr, yy+hh, xx+ww-rr, yy+hh );
 438     gdk_draw_line( m_window, m_penGC, xx, yy+rr, xx, yy+hh-rr );
 439     gdk_draw_line( m_window, m_penGC, xx+ww, yy+rr, xx+ww, yy+hh-rr );
 440     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, dd, dd, 90*64, 90*64 );
 441     gdk_draw_arc( m_window, m_penGC, FALSE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
 442     gdk_draw_arc( m_window, m_penGC, FALSE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
 443     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
 444   }
 445 }
 446
 447 void wxPaintDC::DrawEllipse( long x, long y, long width, long height )
 448 {
 449   if (!Ok()) return;
 450
 451   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 452
 453   long xx = XLOG2DEV(x);
 454   long yy = YLOG2DEV(y);
 455   long ww = m_signX * XLOG2DEVREL(width);
 456   long hh = m_signY * YLOG2DEVREL(height);
 457
 458   // CMB: handle -ve width and/or height
 459   if (ww < 0) { ww = -ww; xx = xx - ww; }
 460   if (hh < 0) { hh = -hh; yy = yy - hh; }
 461
 462   if (m_brush.GetStyle() != wxTRANSPARENT)
 463     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, 0, 360*64 );
 464
 465   if (m_pen.GetStyle() != wxTRANSPARENT)
 466     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, ww, hh, 0, 360*64 );
 467 }
 468
 469 bool wxPaintDC::CanDrawBitmap(void) const
 470 {
 471   return TRUE;
 472 }
 473
 474 void wxPaintDC::DrawIcon( const wxIcon &icon, long x, long y, bool useMask )
 475 {
 476   if (!Ok()) return;
 477
 478   if (!icon.Ok()) return;
 479
 480   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 481
 482   int xx = XLOG2DEV(x);
 483   int yy = YLOG2DEV(y);
 484
 485   GdkBitmap *mask = (GdkBitmap *) NULL;
 486   if (icon.GetMask()) mask = icon.GetMask()->GetBitmap();
 487
 488   if (useMask && mask)
 489   {
 490     gdk_gc_set_clip_mask( m_penGC, mask );
 491     gdk_gc_set_clip_origin( m_penGC, xx, yy );
 492   }
 493
 494   GdkPixmap *pm = icon.GetPixmap();
 495   gdk_draw_pixmap( m_window, m_penGC, pm, 0, 0, xx, yy, -1, -1 );
 496
 497   if (useMask && mask)
 498   {
 499     gdk_gc_set_clip_mask( m_penGC, (GdkBitmap *) NULL );
 500     gdk_gc_set_clip_origin( m_penGC, 0, 0 );
 501   }
 502 }
 503
 504 bool wxPaintDC::Blit( long xdest, long ydest, long width, long height,
 505        wxDC *source, long xsrc, long ysrc, int WXUNUSED(logical_func), bool WXUNUSED(useMask) )
 506 {
 507   if (!Ok()) return FALSE;
 508
 509   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 510
 511   if (m_isMemDC)
 512   {
 513     wxMemoryDC* srcDC = (wxMemoryDC*)source;
 514     GdkBitmap* bmap = srcDC->m_selected.GetBitmap();
 515     if (bmap)
 516     {
 517       gdk_draw_bitmap( m_window, m_textGC, bmap,
 518           source->DeviceToLogicalX(xsrc),
 519           source->DeviceToLogicalY(ysrc),
 520           XLOG2DEV(xdest),
 521           YLOG2DEV(ydest),
 522           source->DeviceToLogicalXRel(width),
 523           source->DeviceToLogicalYRel(height) );
 524       return TRUE;
 525     }
 526   }
 527
 528   wxClientDC *csrc = (wxClientDC*)source;
 529   gdk_window_copy_area ( m_window, m_penGC,
 530     XLOG2DEV(xdest), YLOG2DEV(ydest),
 531     csrc->GetWindow(),
 532     source->DeviceToLogicalX(xsrc), source->DeviceToLogicalY(ysrc),
 533     source->DeviceToLogicalXRel(width), source->DeviceToLogicalYRel(height) );
 534
 535 /*
 536   gdk_window_copy_area ( m_window, m_penGC,
 537     XLOG2DEV(xdest), YLOG2DEV(ydest),
 538     csrc->GetWindow(),
 539     xsrc, ysrc,
 540     width, height );
 541 */
 542
 543   return TRUE;
 544 }
 545
 546 void wxPaintDC::DrawText( const wxString &text, long x, long y, bool WXUNUSED(use16) )
 547 {
 548   if (!Ok()) return;
 549
 550   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 551
 552   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 553
 554   x = XLOG2DEV(x);
 555   y = YLOG2DEV(y);
 556
 557   // CMB 21/5/98: draw text background if mode is wxSOLID
 558   if (m_backgroundMode == wxSOLID)
 559   {
 560     long width = gdk_string_width( font, text );
 561     long height = font->ascent + font->descent;
 562     gdk_gc_set_foreground( m_textGC, m_textBackgroundColour.GetColor() );
 563     gdk_draw_rectangle( m_window, m_textGC, TRUE, x, y, width, height );
 564     gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );
 565   }
 566   gdk_draw_string( m_window, font, m_textGC, x, y + font->ascent, text );
 567
 568   // CMB 17/7/98: simple underline: ignores scaling and underlying
 569   // X font's XA_UNDERLINE_POSITION and XA_UNDERLINE_THICKNESS
 570   // properties (see wxXt implementation)
 571   if (m_font.GetUnderlined())
 572   {
 573     long width = gdk_string_width( font, text );
 574     long ul_y = y + font->ascent;
 575     if (font->descent > 0) ul_y++;
 576     gdk_draw_line( m_window, m_textGC, x, ul_y, x + width, ul_y);
 577   }
 578 }
 579
 580 bool wxPaintDC::CanGetTextExtent(void) const
 581 {
 582   return TRUE;
 583 }
 584
 585 void wxPaintDC::GetTextExtent( const wxString &string, long *width, long *height,
 586                      long *descent, long *externalLeading,
 587                      wxFont *theFont, bool WXUNUSED(use16) )
 588 {
 589   if (!Ok()) return;
 590
 591   wxFont fontToUse = m_font;
 592   if (theFont) fontToUse = *theFont;
 593
 594   GdkFont *font = fontToUse.GetInternalFont( m_scaleY );
 595   if (width) (*width) = long(gdk_string_width( font, string ) / m_scaleX);
 596   if (height) (*height) = long((font->ascent + font->descent) / m_scaleY);
 597   if (descent) (*descent) = long(font->descent / m_scaleY);
 598   if (externalLeading) (*externalLeading) = 0;  // ??
 599 }
 600
 601 long wxPaintDC::GetCharWidth(void)
 602 {
 603   if (!Ok()) return 0;
 604
 605   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 606   return long(gdk_string_width( font, "H" ) / m_scaleX);
 607 }
 608
 609 long wxPaintDC::GetCharHeight(void)
 610 {
 611   if (!Ok()) return 0;
 612
 613   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 614   return long((font->ascent + font->descent) / m_scaleY);
 615 }
 616
 617 void wxPaintDC::Clear(void)
 618 {
 619   if (!Ok()) return;
 620
 621   if (m_isMemDC) ((wxMemoryDC*)this)->m_selected.DestroyImage();
 622
 623   if (!m_isMemDC)
 624   {
 625     gdk_window_clear( m_window );
 626   }
 627   else
 628   {
 629     int width = 0;
 630     int height = 0;
 631     GetSize( &width, &height );
 632     gdk_draw_rectangle( m_window, m_bgGC, TRUE, 0, 0, width, height );
 633   }
 634 }
 635
 636 void wxPaintDC::SetFont( const wxFont &font )
 637 {
 638   if (!Ok()) return;
 639
 640   m_font = font;
 641 }
 642
 643 void wxPaintDC::SetPen( const wxPen &pen )
 644 {
 645   if (!Ok()) return;
 646
 647   if (m_pen == pen) return;
 648
 649   m_pen = pen;
 650
 651   if (!m_pen.Ok()) return;
 652
 653   gint width = m_pen.GetWidth();
 654   // CMB: if width is non-zero scale it with the dc
 655   if (width <= 0)
 656   {
 657     width = 1;
 658   }
 659   else
 660   {
 661     // X doesn't allow different width in x and y and so we take
 662     // the average
 663     double w = 0.5 + (abs(XLOG2DEVREL(width)) + abs(YLOG2DEVREL(width))) / 2.0;
 664     width = (int)w;
 665   }
 666
 667   GdkLineStyle lineStyle = GDK_LINE_SOLID;
 668   switch (m_pen.GetStyle())
 669   {
 670     case wxSOLID:      { lineStyle = GDK_LINE_SOLID;       break; }
 671     case wxDOT:        { lineStyle = GDK_LINE_ON_OFF_DASH; break; }
 672     case wxLONG_DASH:  { lineStyle = GDK_LINE_ON_OFF_DASH; break; }
 673     case wxSHORT_DASH: { lineStyle = GDK_LINE_ON_OFF_DASH; break; }
 674     case wxDOT_DASH:   { lineStyle = GDK_LINE_DOUBLE_DASH; break; }
 675   }
 676
 677   GdkCapStyle capStyle = GDK_CAP_ROUND;
 678   switch (m_pen.GetCap())
 679   {
 680     case wxCAP_ROUND:      { capStyle = (width <= 1) ? GDK_CAP_NOT_LAST : GDK_CAP_ROUND; break; }
 681     case wxCAP_PROJECTING: { capStyle = GDK_CAP_PROJECTING; break; }
 682     case wxCAP_BUTT:       { capStyle = GDK_CAP_BUTT;       break; }
 683   }
 684
 685   GdkJoinStyle joinStyle = GDK_JOIN_ROUND;
 686   switch (m_pen.GetJoin())
 687   {
 688     case wxJOIN_BEVEL: { joinStyle = GDK_JOIN_BEVEL; break; }
 689     case wxJOIN_ROUND: { joinStyle = GDK_JOIN_ROUND; break; }
 690     case wxJOIN_MITER: { joinStyle = GDK_JOIN_MITER; break; }
 691   }
 692
 693   gdk_gc_set_line_attributes( m_penGC, width, lineStyle, capStyle, joinStyle );
 694
 695   m_pen.GetColour().CalcPixel( m_cmap );
 696   gdk_gc_set_foreground( m_penGC, m_pen.GetColour().GetColor() );
 697 }
 698
 699 void wxPaintDC::SetBrush( const wxBrush &brush )
 700 {
 701   if (!Ok()) return;
 702
 703   if (m_brush == brush) return;
 704
 705   m_brush = brush;
 706
 707   if (!m_brush.Ok()) return;
 708
 709   m_brush.GetColour().CalcPixel( m_cmap );
 710   gdk_gc_set_foreground( m_brushGC, m_brush.GetColour().GetColor() );
 711
 712   GdkFill fillStyle = GDK_SOLID;
 713   switch (m_brush.GetStyle())
 714   {
 715     case wxSOLID:
 716     case wxTRANSPARENT:
 717       break;
 718     default:
 719       fillStyle = GDK_STIPPLED;
 720   }
 721
 722   gdk_gc_set_fill( m_brushGC, fillStyle );
 723
 724   if (m_brush.GetStyle() == wxSTIPPLE)
 725   {
 726     gdk_gc_set_stipple( m_brushGC, m_brush.GetStipple()->GetPixmap() );
 727   }
 728
 729   if (IS_HATCH(m_brush.GetStyle()))
 730   {
 731     int num = m_brush.GetStyle() - wxBDIAGONAL_HATCH;
 732     gdk_gc_set_stipple( m_brushGC, hatches[num] );
 733   }
 734 }
 735
 736 // CMB 21/7/98: Added SetBackground. Sets background brush
 737 // for Clear() and bg colour for shapes filled with cross-hatch brush
 738 void wxPaintDC::SetBackground( const wxBrush &brush )
 739 {
 740   if (!Ok()) return;
 741
 742   if (m_backgroundBrush == brush) return;
 743
 744   m_backgroundBrush = brush;
 745
 746   if (!m_backgroundBrush.Ok()) return;
 747
 748   m_backgroundBrush.GetColour().CalcPixel( m_cmap );
 749   gdk_gc_set_background( m_brushGC, m_backgroundBrush.GetColour().GetColor() );
 750   gdk_gc_set_foreground( m_bgGC, m_backgroundBrush.GetColour().GetColor() );
 751
 752   GdkFill fillStyle = GDK_SOLID;
 753   switch (m_backgroundBrush.GetStyle())
 754   {
 755     case wxSOLID:
 756     case wxTRANSPARENT:
 757       break;
 758     default:
 759       fillStyle = GDK_STIPPLED;
 760   }
 761
 762   gdk_gc_set_fill( m_bgGC, fillStyle );
 763
 764   if (m_backgroundBrush.GetStyle() == wxSTIPPLE)
 765   {
 766     gdk_gc_set_stipple( m_bgGC, m_backgroundBrush.GetStipple()->GetPixmap() );
 767   }
 768
 769   if (IS_HATCH(m_backgroundBrush.GetStyle()))
 770   {
 771     int num = m_backgroundBrush.GetStyle() - wxBDIAGONAL_HATCH;
 772     gdk_gc_set_stipple( m_bgGC, hatches[num] );
 773   }
 774 }
 775
 776 void wxPaintDC::SetLogicalFunction( int function )
 777 {
 778   if (m_logicalFunction == function) return;
 779   GdkFunction mode = GDK_COPY;
 780   switch (function)
 781   {
 782     case wxXOR:    mode = GDK_INVERT; break;
 783     case wxINVERT: mode = GDK_INVERT; break;
 784     default:       break;
 785   }
 786   m_logicalFunction = function;
 787   gdk_gc_set_function( m_penGC, mode );
 788   gdk_gc_set_function( m_brushGC, mode );
 789 }
 790
 791 void wxPaintDC::SetTextForeground( const wxColour &col )
 792 {
 793   if (!Ok()) return;
 794
 795   if (m_textForegroundColour == col) return;
 796
 797   m_textForegroundColour = col;
 798   if (!m_textForegroundColour.Ok()) return;
 799
 800   m_textForegroundColour.CalcPixel( m_cmap );
 801   gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );
 802 }
 803
 804 void wxPaintDC::SetTextBackground( const wxColour &col )
 805 {
 806   if (!Ok()) return;
 807
 808   if (m_textBackgroundColour == col) return;
 809
 810   m_textBackgroundColour = col;
 811   if (!m_textBackgroundColour.Ok()) return;
 812
 813   m_textBackgroundColour.CalcPixel( m_cmap );
 814   gdk_gc_set_background( m_textGC, m_textBackgroundColour.GetColor() );
 815 }
 816
 817 void wxPaintDC::SetBackgroundMode( int mode )
 818 {
 819   m_backgroundMode = mode;
 820
 821   // CMB 21/7/98: fill style of cross-hatch brushes is affected by
 822   // transparent/solid background mode
 823   if (m_brush.GetStyle() != wxSOLID && m_brush.GetStyle() != wxTRANSPARENT)
 824   {
 825     gdk_gc_set_fill( m_brushGC,
 826       (m_backgroundMode == wxTRANSPARENT) ? GDK_STIPPLED : GDK_OPAQUE_STIPPLED);
 827   }
 828 }
 829
 830 void wxPaintDC::SetPalette( const wxPalette& WXUNUSED(palette) )
 831 {
 832 }
 833
 834 void wxPaintDC::SetClippingRegion( long x, long y, long width, long height )
 835 {
 836   wxDC::SetClippingRegion( x, y, width, height );
 837
 838   GdkRectangle rect;
 839   rect.x = XLOG2DEV(x);
 840   rect.y = YLOG2DEV(y);
 841   rect.width = XLOG2DEVREL(width);
 842   rect.height = YLOG2DEVREL(height);
 843   gdk_gc_set_clip_rectangle( m_penGC, &rect );
 844   gdk_gc_set_clip_rectangle( m_brushGC, &rect );
 845   gdk_gc_set_clip_rectangle( m_textGC, &rect );
 846   gdk_gc_set_clip_rectangle( m_bgGC, &rect );
 847
 848 }
 849
 850 void wxPaintDC::DestroyClippingRegion(void)
 851 {
 852   wxDC::DestroyClippingRegion();
 853
 854   gdk_gc_set_clip_rectangle( m_penGC, (GdkRectangle *) NULL );
 855   gdk_gc_set_clip_rectangle( m_brushGC, (GdkRectangle *) NULL );
 856   gdk_gc_set_clip_rectangle( m_textGC, (GdkRectangle *) NULL );
 857   gdk_gc_set_clip_rectangle( m_bgGC, (GdkRectangle *) NULL );
 858 }
 859
 860 void wxPaintDC::SetUpDC(void)
 861 {
 862   m_ok = TRUE;
 863   m_logicalFunction = wxCOPY;
 864   if (m_penGC) gdk_gc_unref( m_penGC );
 865   m_penGC = gdk_gc_new( m_window );
 866   if (m_brushGC) gdk_gc_unref( m_brushGC );
 867   m_brushGC = gdk_gc_new( m_window );
 868   if (m_textGC) gdk_gc_unref( m_textGC );
 869   m_textGC = gdk_gc_new( m_window );
 870   if (m_bgGC) gdk_gc_unref( m_bgGC );
 871   m_bgGC = gdk_gc_new( m_window );
 872   SetTextForeground( m_textForegroundColour );
 873   SetTextBackground( m_textBackgroundColour );
 874   SetPen( m_pen );
 875   SetFont( m_font );
 876   SetBrush( m_brush );
 877
 878   gdk_gc_set_background( m_penGC, wxWHITE->GetColor() );
 879
 880   if (!hatch_bitmap)
 881   {
 882     hatch_bitmap    = hatches;
 883     hatch_bitmap[0] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, bdiag_bits, bdiag_width, bdiag_height );
 884     hatch_bitmap[1] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, cdiag_bits, cdiag_width, cdiag_height );
 885     hatch_bitmap[2] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, fdiag_bits, fdiag_width, fdiag_height );
 886     hatch_bitmap[3] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, cross_bits, cross_width, cross_height );
 887     hatch_bitmap[4] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, horiz_bits, horiz_width, horiz_height );
 888     hatch_bitmap[5] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, verti_bits, verti_width, verti_height );
 889   }
 890 }
 891
 892 GdkWindow *wxPaintDC::GetWindow(void)
 893 {
 894   return m_window;
 895 }
 896
 897 // ----------------------------------- spline code ----------------------------------------
 898
 899 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
 900                          double a3, double b3, double a4, double b4);
 901 void wx_clear_stack(void);
 902 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
 903         double *y3, double *x4, double *y4);
 904 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
 905           double x4, double y4);
 906 static bool wx_spline_add_point(double x, double y);
 907 static void wx_spline_draw_point_array(wxDC *dc);
 908
 909 wxList wx_spline_point_list;
 910
 911 #define         half(z1, z2)    ((z1+z2)/2.0)
 912 #define         THRESHOLD       5
 913
 914 /* iterative version */
 915
 916 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
 917                  double b4)
 918 {
 919     register double  xmid, ymid;
 920     double           x1, y1, x2, y2, x3, y3, x4, y4;
 921
 922     wx_clear_stack();
 923     wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
 924
 925     while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
 926         xmid = (double)half(x2, x3);
 927         ymid = (double)half(y2, y3);
 928         if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
 929             fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
 930             wx_spline_add_point( x1, y1 );
 931             wx_spline_add_point( xmid, ymid );
 932         } else {
 933             wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
 934                  (double)half(x3, x4), (double)half(y3, y4), x4, y4);
 935             wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
 936                  (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
 937         }
 938     }
 939 }
 940
 941 /* utilities used by spline drawing routines */
 942
 943 typedef struct wx_spline_stack_struct {
 944     double           x1, y1, x2, y2, x3, y3, x4, y4;
 945 } Stack;
 946
 947 #define         SPLINE_STACK_DEPTH             20
 948 static Stack    wx_spline_stack[SPLINE_STACK_DEPTH];
 949 static Stack   *wx_stack_top;
 950 static int      wx_stack_count;
 951
 952 void wx_clear_stack(void)
 953 {
 954     wx_stack_top = wx_spline_stack;
 955     wx_stack_count = 0;
 956 }
 957
 958 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
 959 {
 960     wx_stack_top->x1 = x1;
 961     wx_stack_top->y1 = y1;
 962     wx_stack_top->x2 = x2;
 963     wx_stack_top->y2 = y2;
 964     wx_stack_top->x3 = x3;
 965     wx_stack_top->y3 = y3;
 966     wx_stack_top->x4 = x4;
 967     wx_stack_top->y4 = y4;
 968     wx_stack_top++;
 969     wx_stack_count++;
 970 }
 971
 972 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
 973                   double *x3, double *y3, double *x4, double *y4)
 974 {
 975     if (wx_stack_count == 0)
 976         return (0);
 977     wx_stack_top--;
 978     wx_stack_count--;
 979     *x1 = wx_stack_top->x1;
 980     *y1 = wx_stack_top->y1;
 981     *x2 = wx_stack_top->x2;
 982     *y2 = wx_stack_top->y2;
 983     *x3 = wx_stack_top->x3;
 984     *y3 = wx_stack_top->y3;
 985     *x4 = wx_stack_top->x4;
 986     *y4 = wx_stack_top->y4;
 987     return (1);
 988 }
 989
 990 static bool wx_spline_add_point(double x, double y)
 991 {
 992   wxPoint *point = new wxPoint ;
 993   point->x = (int) x;
 994   point->y = (int) y;
 995   wx_spline_point_list.Append((wxObject*)point);
 996   return TRUE;
 997 }
 998
 999 static void wx_spline_draw_point_array(wxDC *dc)
1000 {
1001   dc->DrawLines(&wx_spline_point_list, 0, 0 );
1002   wxNode *node = wx_spline_point_list.First();
1003   while (node)
1004   {
1005     wxPoint *point = (wxPoint *)node->Data();
1006     delete point;
1007     delete node;
1008     node = wx_spline_point_list.First();
1009   }
1010 }
1011
1012 void wxPaintDC::DrawSpline( wxList *points )
1013 {
1014     wxPoint *p;
1015     double           cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
1016     double           x1, y1, x2, y2;
1017
1018     wxNode *node = points->First();
1019     p = (wxPoint *)node->Data();
1020
1021     x1 = p->x;
1022     y1 = p->y;
1023
1024     node = node->Next();
1025     p = (wxPoint *)node->Data();
1026
1027     x2 = p->x;
1028     y2 = p->y;
1029     cx1 = (double)((x1 + x2) / 2);
1030     cy1 = (double)((y1 + y2) / 2);
1031     cx2 = (double)((cx1 + x2) / 2);
1032     cy2 = (double)((cy1 + y2) / 2);
1033
1034     wx_spline_add_point(x1, y1);
1035
1036     while ((node = node->Next()) != NULL)
1037     {
1038         p = (wxPoint *)node->Data();
1039         x1 = x2;
1040         y1 = y2;
1041         x2 = p->x;
1042         y2 = p->y;
1043         cx4 = (double)(x1 + x2) / 2;
1044         cy4 = (double)(y1 + y2) / 2;
1045         cx3 = (double)(x1 + cx4) / 2;
1046         cy3 = (double)(y1 + cy4) / 2;
1047
1048         wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
1049
1050         cx1 = cx4;
1051         cy1 = cy4;
1052         cx2 = (double)(cx1 + x2) / 2;
1053         cy2 = (double)(cy1 + y2) / 2;
1054     }
1055
1056     wx_spline_add_point( cx1, cy1 );
1057     wx_spline_add_point( x2, y2 );
1058
1059     wx_spline_draw_point_array( this );
1060 }