src/gtk/dcclient.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dcclient.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 1998 Robert Roebling, Markus Holzem, Chris Breeze
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #ifdef __GNUG__
  11 #pragma implementation "dcclient.h"
  12 #endif
  13
  14 #include "wx/dcclient.h"
  15 #include "wx/dcmemory.h"
  16
  17 //-----------------------------------------------------------------------------
  18 // local data
  19 //-----------------------------------------------------------------------------
  20
  21 #include "bdiag.xbm"
  22 #include "fdiag.xbm"
  23 #include "cdiag.xbm"
  24 #include "horiz.xbm"
  25 #include "verti.xbm"
  26 #include "cross.xbm"
  27 #define  num_hatches 6
  28
  29 static GdkPixmap  *hatches[num_hatches];
  30 static GdkPixmap **hatch_bitmap = (GdkPixmap **) NULL;
  31
  32 //-----------------------------------------------------------------------------
  33 // constants
  34 //-----------------------------------------------------------------------------
  35
  36 #define RAD2DEG 57.2957795131
  37
  38 //-----------------------------------------------------------------------------
  39 // temporary implementation of the missing GDK function
  40 //-----------------------------------------------------------------------------
  41 #include "gdk/gdkprivate.h"
  42 void gdk_draw_bitmap     (GdkDrawable  *drawable,
  43                           GdkGC        *gc,
  44                           GdkDrawable  *src,
  45                           gint          xsrc,
  46                           gint          ysrc,
  47                           gint          xdest,
  48                           gint          ydest,
  49                           gint          width,
  50                           gint          height)
  51 {
  52   GdkWindowPrivate *drawable_private;
  53   GdkWindowPrivate *src_private;
  54   GdkGCPrivate *gc_private;
  55
  56   g_return_if_fail (drawable != NULL);
  57   g_return_if_fail (src != NULL);
  58   g_return_if_fail (gc != NULL);
  59
  60   drawable_private = (GdkWindowPrivate*) drawable;
  61   src_private = (GdkWindowPrivate*) src;
  62   if (drawable_private->destroyed || src_private->destroyed)
  63     return;
  64   gc_private = (GdkGCPrivate*) gc;
  65
  66   if (width == -1)
  67     width = src_private->width;
  68   if (height == -1)
  69     height = src_private->height;
  70
  71   XCopyPlane (drawable_private->xdisplay,
  72              src_private->xwindow,
  73              drawable_private->xwindow,
  74              gc_private->xgc,
  75              xsrc, ysrc,
  76              width, height,
  77              xdest, ydest,
  78              1);
  79 }
  80
  81 //-----------------------------------------------------------------------------
  82 // wxPaintDC
  83 //-----------------------------------------------------------------------------
  84
  85 IMPLEMENT_DYNAMIC_CLASS(wxPaintDC,wxDC)
  86
  87 wxPaintDC::wxPaintDC(void)
  88 {
  89   m_penGC = (GdkGC *) NULL;
  90   m_brushGC = (GdkGC *) NULL;
  91   m_textGC = (GdkGC *) NULL;
  92   m_bgGC = (GdkGC *) NULL;
  93   m_cmap = (GdkColormap *) NULL;
  94   m_isMemDC = FALSE;
  95 }
  96
  97 wxPaintDC::wxPaintDC( wxWindow *window )
  98 {
  99   m_penGC = (GdkGC *) NULL;
 100   m_brushGC = (GdkGC *) NULL;
 101   m_textGC = (GdkGC *) NULL;
 102   m_bgGC = (GdkGC *) NULL;
 103   m_cmap = (GdkColormap *) 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_isMemDC = FALSE;
 116
 117   SetUpDC();
 118 }
 119
 120 wxPaintDC::~wxPaintDC(void)
 121 {
 122   Destroy();
 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_pen.GetStyle() != wxTRANSPARENT)
 142   {
 143     gdk_draw_line( m_window, m_penGC,
 144       XLOG2DEV(x1), YLOG2DEV(y1), XLOG2DEV(x2), YLOG2DEV(y2) );
 145   }
 146 }
 147
 148 void wxPaintDC::CrossHair( long x, long y )
 149 {
 150   if (!Ok()) return;
 151
 152   if (m_pen.GetStyle() != wxTRANSPARENT)
 153   {
 154     int w = 0;
 155     int h = 0;
 156     GetSize( &w, &h );
 157     long xx = XLOG2DEV(x);
 158     long yy = YLOG2DEV(y);
 159     gdk_draw_line( m_window, m_penGC,
 160       0, yy, XLOG2DEVREL(w), yy );
 161     gdk_draw_line( m_window, m_penGC,
 162       xx, 0, xx, YLOG2DEVREL(h) );
 163   }
 164 }
 165
 166 void wxPaintDC::DrawArc( long x1, long y1, long x2, long y2, double xc, double yc )
 167 {
 168   if (!Ok()) return;
 169
 170   long xx1 = XLOG2DEV(x1);
 171   long yy1 = YLOG2DEV(y1);
 172   long xx2 = XLOG2DEV(x2);
 173   long yy2 = YLOG2DEV(y2);
 174   long xxc = XLOG2DEV((long)xc);
 175   long yyc = YLOG2DEV((long)yc);
 176   double dx = xx1 - xxc;
 177   double dy = yy1 - yyc;
 178   double radius = sqrt(dx*dx+dy*dy);
 179   long   r      = (long)radius;
 180   double radius1, radius2;
 181
 182   if (xx1 == xx2 && yy1 == yy2)
 183   {
 184     radius1 = 0.0;
 185     radius2 = 360.0;
 186   }
 187   else
 188   if (radius == 0.0)
 189   {
 190     radius1 = radius2 = 0.0;
 191   }
 192   else
 193   {
 194     radius1 = (xx1 - xxc == 0) ?
 195             (yy1 - yyc < 0) ? 90.0 : -90.0 :
 196             -atan2(double(yy1-yyc), double(xx1-xxc)) * RAD2DEG;
 197     radius2 = (xx2 - xxc == 0) ?
 198             (yy2 - yyc < 0) ? 90.0 : -90.0 :
 199             -atan2(double(yy2-yyc), double(xx2-xxc)) * RAD2DEG;
 200   }
 201   long alpha1 = long(radius1 * 64.0);
 202   long alpha2 = long((radius2 - radius1) * 64.0);
 203   while (alpha2 <= 0) alpha2 += 360*64;
 204   while (alpha1 > 360*64) alpha1 -= 360*64;
 205
 206   if (m_brush.GetStyle() != wxTRANSPARENT)
 207     gdk_draw_arc( m_window, m_brushGC, TRUE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
 208
 209   if (m_pen.GetStyle() != wxTRANSPARENT)
 210     gdk_draw_arc( m_window, m_penGC, FALSE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
 211
 212 }
 213
 214 void wxPaintDC::DrawEllipticArc( long x, long y, long width, long height, double sa, double ea )
 215 {
 216   if (!Ok()) return;
 217
 218   long xx = XLOG2DEV(x);
 219   long yy = YLOG2DEV(y);
 220   long ww = m_signX * XLOG2DEVREL(width);
 221   long hh = m_signY * YLOG2DEVREL(height);
 222
 223   // CMB: handle -ve width and/or height
 224   if (ww < 0) { ww = -ww; xx = xx - ww; }
 225   if (hh < 0) { hh = -hh; yy = yy - hh; }
 226
 227   long start = long(sa * 64.0);
 228   long end = long(ea * 64.0);
 229   if (m_brush.GetStyle() != wxTRANSPARENT)
 230     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, start, end );
 231
 232   if (m_pen.GetStyle() != wxTRANSPARENT)
 233     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, ww, hh, start, end );
 234 }
 235
 236 void wxPaintDC::DrawPoint( long x, long y )
 237 {
 238   if (!Ok()) return;
 239
 240   if (m_pen.GetStyle() != wxTRANSPARENT)
 241     gdk_draw_point( m_window, m_penGC, XLOG2DEV(x), YLOG2DEV(y) );
 242 }
 243
 244 void wxPaintDC::DrawLines( int n, wxPoint points[], long xoffset, long yoffset )
 245 {
 246   if (!Ok()) return;
 247
 248   if (m_pen.GetStyle() == wxTRANSPARENT) return;
 249
 250   for (int i = 0; i < n-1; i++)
 251   {
 252     long x1 = XLOG2DEV(points[i].x + xoffset);
 253     long x2 = XLOG2DEV(points[i+1].x + xoffset);
 254     long y1 = YLOG2DEV(points[i].y + yoffset);     // oh, what a waste
 255     long y2 = YLOG2DEV(points[i+1].y + yoffset);
 256     gdk_draw_line( m_window, m_penGC, x1, y1, x2, y2 );
 257   }
 258 }
 259
 260 void wxPaintDC::DrawLines( wxList *points, long xoffset, long yoffset )
 261 {
 262   if (!Ok()) return;
 263
 264   if (m_pen.GetStyle() == wxTRANSPARENT) return;
 265
 266   wxNode *node = points->First();
 267   while (node->Next())
 268   {
 269     wxPoint *point = (wxPoint*)node->Data();
 270     wxPoint *npoint = (wxPoint*)node->Next()->Data();
 271     long x1 = XLOG2DEV(point->x + xoffset);
 272     long x2 = XLOG2DEV(npoint->x + xoffset);
 273     long y1 = YLOG2DEV(point->y + yoffset);    // and again...
 274     long y2 = YLOG2DEV(npoint->y + yoffset);
 275     gdk_draw_line( m_window, m_penGC, x1, y1, x2, y2 );
 276     node = node->Next();
 277   }
 278 }
 279
 280 void wxPaintDC::DrawPolygon( int n, wxPoint points[], long xoffset, long yoffset, int WXUNUSED(fillStyle) )
 281 {
 282   if (!Ok()) return;
 283
 284    if (!n) return;    // Nothing to draw
 285    GdkPoint *gdkpoints = new GdkPoint[n+1];
 286    int i;
 287    for (i = 0 ; i < n ; i++)
 288      {
 289        gdkpoints[i].x = XLOG2DEV(points[i].x + xoffset);
 290        gdkpoints[i].y = YLOG2DEV(points[i].y + yoffset);
 291      }
 292    if (m_brush.GetStyle() != wxTRANSPARENT)
 293      gdk_draw_polygon (m_window, m_brushGC, TRUE, gdkpoints, n);
 294    // To do: Fillstyle
 295    if (m_pen.GetStyle() != wxTRANSPARENT)
 296      for (i = 0 ; i < n ; i++)
 297        gdk_draw_line( m_window, m_penGC,
 298                      gdkpoints[i%n].x,
 299                      gdkpoints[i%n].y,
 300                      gdkpoints[(i+1)%n].x,
 301                      gdkpoints[(i+1)%n].y);
 302    delete[] gdkpoints;
 303 }
 304
 305 void wxPaintDC::DrawPolygon( wxList *lines, long xoffset, long yoffset, int WXUNUSED(fillStyle))
 306 {
 307   if (!Ok()) return;
 308
 309    int n = lines->Number();
 310    GdkPoint *gdkpoints = new GdkPoint[n];
 311    wxNode *node = lines->First();
 312    int cnt=0;
 313    while (node)
 314      {
 315        wxPoint *p = (wxPoint *) node->Data();
 316        gdkpoints[cnt].x = XLOG2DEV(p->x + xoffset);
 317        gdkpoints[cnt].y = YLOG2DEV(p->y + yoffset);
 318        node = node->Next();
 319        cnt++;
 320      }
 321    if (m_brush.GetStyle() != wxTRANSPARENT)
 322      gdk_draw_polygon (m_window, m_brushGC, TRUE, gdkpoints, n);
 323    // To do: Fillstyle
 324    if (m_pen.GetStyle() != wxTRANSPARENT)
 325      {
 326        int i;
 327        for (i = 0 ; i < n ; i++)
 328         gdk_draw_line( m_window, m_penGC,
 329                        gdkpoints[i%n].x,
 330                        gdkpoints[i%n].y,
 331                        gdkpoints[(i+1)%n].x,
 332                        gdkpoints[(i+1)%n].y);
 333      }
 334    delete[] gdkpoints;
 335 }
 336
 337 void wxPaintDC::DrawRectangle( long x, long y, long width, long height )
 338 {
 339   if (!Ok()) return;
 340
 341   long xx = XLOG2DEV(x);
 342   long yy = YLOG2DEV(y);
 343   long ww = m_signX * XLOG2DEVREL(width);
 344   long hh = m_signY * YLOG2DEVREL(height);
 345
 346   // CMB: draw nothing if transformed w or h is 0
 347   if (ww == 0 || hh == 0) return;
 348
 349   // CMB: handle -ve width and/or height
 350   if (ww < 0) { ww = -ww; xx = xx - ww; }
 351   if (hh < 0) { hh = -hh; yy = yy - hh; }
 352
 353   if (m_brush.GetStyle() != wxTRANSPARENT)
 354     gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy, ww, hh );
 355
 356   if (m_pen.GetStyle() != wxTRANSPARENT)
 357     gdk_draw_rectangle( m_window, m_penGC, FALSE, xx, yy, ww-1, hh-1 );
 358 }
 359
 360 void wxPaintDC::DrawRoundedRectangle( long x, long y, long width, long height, double radius )
 361 {
 362   if (!Ok()) return;
 363
 364   if (radius < 0.0) radius = - radius * ((width < height) ? width : height);
 365
 366   long xx = XLOG2DEV(x);
 367   long yy = YLOG2DEV(y);
 368   long ww = m_signX * XLOG2DEVREL(width);
 369   long hh = m_signY * YLOG2DEVREL(height);
 370   long rr = XLOG2DEVREL((long)radius);
 371
 372   // CMB: handle -ve width and/or height
 373   if (ww < 0) { ww = -ww; xx = xx - ww; }
 374   if (hh < 0) { hh = -hh; yy = yy - hh; }
 375
 376   // CMB: if radius is zero use DrawRectangle() instead to avoid
 377   // X drawing errors with small radii
 378   if (rr == 0)
 379   {
 380     DrawRectangle( x, y, width, height );
 381     return;
 382   }
 383
 384   // CMB: draw nothing if transformed w or h is 0
 385   if (ww == 0 || hh == 0) return;
 386
 387   // CMB: adjust size if outline is drawn otherwise the result is
 388   // 1 pixel too wide and high
 389   if (m_pen.GetStyle() != wxTRANSPARENT)
 390   {
 391     ww--;
 392     hh--;
 393   }
 394
 395   // CMB: ensure dd is not larger than rectangle otherwise we
 396   // get an hour glass shape
 397   long dd = 2 * rr;
 398   if (dd > ww) dd = ww;
 399   if (dd > hh) dd = hh;
 400   rr = dd / 2;
 401
 402   if (m_brush.GetStyle() != wxTRANSPARENT)
 403   {
 404     gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx+rr, yy, ww-dd+1, hh );
 405     gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy+rr, ww, hh-dd+1 );
 406     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, dd, dd, 90*64, 90*64 );
 407     gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
 408     gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
 409     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
 410   }
 411
 412   if (m_pen.GetStyle() != wxTRANSPARENT)
 413   {
 414     gdk_draw_line( m_window, m_penGC, xx+rr, yy, xx+ww-rr, yy );
 415     gdk_draw_line( m_window, m_penGC, xx+rr, yy+hh, xx+ww-rr, yy+hh );
 416     gdk_draw_line( m_window, m_penGC, xx, yy+rr, xx, yy+hh-rr );
 417     gdk_draw_line( m_window, m_penGC, xx+ww, yy+rr, xx+ww, yy+hh-rr );
 418     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, dd, dd, 90*64, 90*64 );
 419     gdk_draw_arc( m_window, m_penGC, FALSE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
 420     gdk_draw_arc( m_window, m_penGC, FALSE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
 421     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
 422   }
 423 }
 424
 425 void wxPaintDC::DrawEllipse( long x, long y, long width, long height )
 426 {
 427   if (!Ok()) return;
 428
 429   long xx = XLOG2DEV(x);
 430   long yy = YLOG2DEV(y);
 431   long ww = m_signX * XLOG2DEVREL(width);
 432   long hh = m_signY * YLOG2DEVREL(height);
 433
 434   // CMB: handle -ve width and/or height
 435   if (ww < 0) { ww = -ww; xx = xx - ww; }
 436   if (hh < 0) { hh = -hh; yy = yy - hh; }
 437
 438   if (m_brush.GetStyle() != wxTRANSPARENT)
 439     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, 0, 360*64 );
 440
 441   if (m_pen.GetStyle() != wxTRANSPARENT)
 442     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, ww, hh, 0, 360*64 );
 443 }
 444
 445 bool wxPaintDC::CanDrawBitmap(void) const
 446 {
 447   return TRUE;
 448 }
 449
 450 void wxPaintDC::DrawIcon( const wxIcon &icon, long x, long y, bool useMask )
 451 {
 452   if (!Ok()) return;
 453
 454   if (!icon.Ok()) return;
 455
 456   int xx = XLOG2DEV(x);
 457   int yy = YLOG2DEV(y);
 458
 459   GdkBitmap *mask = (GdkBitmap *) NULL;
 460   if (icon.GetMask()) mask = icon.GetMask()->GetBitmap();
 461
 462   if (useMask && mask)
 463   {
 464     gdk_gc_set_clip_mask( m_penGC, mask );
 465     gdk_gc_set_clip_origin( m_penGC, xx, yy );
 466   }
 467
 468   GdkPixmap *pm = icon.GetPixmap();
 469   gdk_draw_pixmap( m_window, m_penGC, pm, 0, 0, xx, yy, -1, -1 );
 470
 471   if (useMask && mask)
 472   {
 473     gdk_gc_set_clip_mask( m_penGC, (GdkBitmap *) NULL );
 474     gdk_gc_set_clip_origin( m_penGC, 0, 0 );
 475   }
 476 }
 477
 478 bool wxPaintDC::Blit( long xdest, long ydest, long width, long height,
 479        wxDC *source, long xsrc, long ysrc, int WXUNUSED(logical_func), bool WXUNUSED(useMask) )
 480 {
 481   if (!Ok()) return FALSE;
 482
 483   wxClientDC *csrc = (wxClientDC*)source;
 484
 485   if (csrc->m_isMemDC)
 486   {
 487     wxMemoryDC* srcDC = (wxMemoryDC*)source;
 488     GdkBitmap* bmap = srcDC->m_selected.GetBitmap();
 489     if (bmap)
 490     {
 491       gdk_draw_bitmap( m_window, m_textGC, bmap,
 492           source->DeviceToLogicalX(xsrc),
 493           source->DeviceToLogicalY(ysrc),
 494           XLOG2DEV(xdest),
 495           YLOG2DEV(ydest),
 496           source->DeviceToLogicalXRel(width),
 497           source->DeviceToLogicalYRel(height) );
 498       return TRUE;
 499     }
 500   }
 501
 502   gdk_window_copy_area ( m_window, m_penGC,
 503     XLOG2DEV(xdest), YLOG2DEV(ydest),
 504     csrc->GetWindow(),
 505     source->DeviceToLogicalX(xsrc), source->DeviceToLogicalY(ysrc),
 506     source->DeviceToLogicalXRel(width), source->DeviceToLogicalYRel(height) );
 507
 508 /*
 509   gdk_window_copy_area ( m_window, m_penGC,
 510     XLOG2DEV(xdest), YLOG2DEV(ydest),
 511     csrc->GetWindow(),
 512     xsrc, ysrc,
 513     width, height );
 514 */
 515
 516   return TRUE;
 517 }
 518
 519 void wxPaintDC::DrawText( const wxString &text, long x, long y, bool WXUNUSED(use16) )
 520 {
 521   if (!Ok()) return;
 522
 523   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 524
 525   x = XLOG2DEV(x);
 526   y = YLOG2DEV(y);
 527
 528   // CMB 21/5/98: draw text background if mode is wxSOLID
 529   if (m_backgroundMode == wxSOLID)
 530   {
 531     long width = gdk_string_width( font, text );
 532     long height = font->ascent + font->descent;
 533     gdk_gc_set_foreground( m_textGC, m_textBackgroundColour.GetColor() );
 534     gdk_draw_rectangle( m_window, m_textGC, TRUE, x, y, width, height );
 535     gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );
 536   }
 537   gdk_draw_string( m_window, font, m_textGC, x, y + font->ascent, text );
 538
 539   // CMB 17/7/98: simple underline: ignores scaling and underlying
 540   // X font's XA_UNDERLINE_POSITION and XA_UNDERLINE_THICKNESS
 541   // properties (see wxXt implementation)
 542   if (m_font.GetUnderlined())
 543   {
 544     long width = gdk_string_width( font, text );
 545     long ul_y = y + font->ascent;
 546     if (font->descent > 0) ul_y++;
 547     gdk_draw_line( m_window, m_textGC, x, ul_y, x + width, ul_y);
 548   }
 549 }
 550
 551 bool wxPaintDC::CanGetTextExtent(void) const
 552 {
 553   return TRUE;
 554 }
 555
 556 void wxPaintDC::GetTextExtent( const wxString &string, long *width, long *height,
 557                      long *descent, long *externalLeading,
 558                      wxFont *theFont, bool WXUNUSED(use16) )
 559 {
 560   if (!Ok()) return;
 561
 562   wxFont fontToUse = m_font;
 563   if (theFont) fontToUse = *theFont;
 564
 565   GdkFont *font = fontToUse.GetInternalFont( m_scaleY );
 566   if (width) (*width) = long(gdk_string_width( font, string ) / m_scaleX);
 567   if (height) (*height) = long((font->ascent + font->descent) / m_scaleY);
 568   if (descent) (*descent) = long(font->descent / m_scaleY);
 569   if (externalLeading) (*externalLeading) = 0;  // ??
 570 }
 571
 572 long wxPaintDC::GetCharWidth(void)
 573 {
 574   if (!Ok()) return 0;
 575
 576   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 577   return long(gdk_string_width( font, "H" ) / m_scaleX);
 578 }
 579
 580 long wxPaintDC::GetCharHeight(void)
 581 {
 582   if (!Ok()) return 0;
 583
 584   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 585   return long((font->ascent + font->descent) / m_scaleY);
 586 }
 587
 588 void wxPaintDC::Clear(void)
 589 {
 590   if (!Ok()) return;
 591
 592   if (!m_isMemDC)
 593   {
 594     gdk_window_clear( m_window );
 595   }
 596   else
 597   {
 598     int width = 0;
 599     int height = 0;
 600     GetSize( &width, &height );
 601     gdk_draw_rectangle( m_window, m_bgGC, TRUE, 0, 0, width, height );
 602   }
 603 }
 604
 605 void wxPaintDC::SetFont( const wxFont &font )
 606 {
 607   if (!Ok()) return;
 608
 609   m_font = font;
 610 }
 611
 612 void wxPaintDC::SetPen( const wxPen &pen )
 613 {
 614   if (!Ok()) return;
 615
 616   if (m_pen == pen) return;
 617
 618   m_pen = pen;
 619
 620   if (!m_pen.Ok()) return;
 621
 622   gint width = m_pen.GetWidth();
 623   // CMB: if width is non-zero scale it with the dc
 624   if (width <= 0)
 625   {
 626     width = 1;
 627   }
 628   else
 629   {
 630     // X doesn't allow different width in x and y and so we take
 631     // the average
 632     double w = 0.5 + (abs(XLOG2DEVREL(width)) + abs(YLOG2DEVREL(width))) / 2.0;
 633     width = (int)w;
 634   }
 635
 636   GdkLineStyle lineStyle = GDK_LINE_SOLID;
 637   switch (m_pen.GetStyle())
 638   {
 639     case wxSOLID:      { lineStyle = GDK_LINE_SOLID;       break; }
 640     case wxDOT:        { lineStyle = GDK_LINE_ON_OFF_DASH; break; }
 641     case wxLONG_DASH:  { lineStyle = GDK_LINE_ON_OFF_DASH; break; }
 642     case wxSHORT_DASH: { lineStyle = GDK_LINE_ON_OFF_DASH; break; }
 643     case wxDOT_DASH:   { lineStyle = GDK_LINE_DOUBLE_DASH; break; }
 644   }
 645
 646   GdkCapStyle capStyle = GDK_CAP_ROUND;
 647   switch (m_pen.GetCap())
 648   {
 649     case wxCAP_ROUND:      { capStyle = (width <= 1) ? GDK_CAP_NOT_LAST : GDK_CAP_ROUND; break; }
 650     case wxCAP_PROJECTING: { capStyle = GDK_CAP_PROJECTING; break; }
 651     case wxCAP_BUTT:       { capStyle = GDK_CAP_BUTT;       break; }
 652   }
 653
 654   GdkJoinStyle joinStyle = GDK_JOIN_ROUND;
 655   switch (m_pen.GetJoin())
 656   {
 657     case wxJOIN_BEVEL: { joinStyle = GDK_JOIN_BEVEL; break; }
 658     case wxJOIN_ROUND: { joinStyle = GDK_JOIN_ROUND; break; }
 659     case wxJOIN_MITER: { joinStyle = GDK_JOIN_MITER; break; }
 660   }
 661
 662   gdk_gc_set_line_attributes( m_penGC, width, lineStyle, capStyle, joinStyle );
 663
 664   m_pen.GetColour().CalcPixel( m_cmap );
 665   gdk_gc_set_foreground( m_penGC, m_pen.GetColour().GetColor() );
 666 }
 667
 668 void wxPaintDC::SetBrush( const wxBrush &brush )
 669 {
 670   if (!Ok()) return;
 671
 672   if (m_brush == brush) return;
 673
 674   m_brush = brush;
 675
 676   if (!m_brush.Ok()) return;
 677
 678   m_brush.GetColour().CalcPixel( m_cmap );
 679   gdk_gc_set_foreground( m_brushGC, m_brush.GetColour().GetColor() );
 680
 681   GdkFill fillStyle = GDK_SOLID;
 682   switch (m_brush.GetStyle())
 683   {
 684     case wxSOLID:
 685     case wxTRANSPARENT:
 686       break;
 687     default:
 688       fillStyle = GDK_STIPPLED;
 689   }
 690
 691   gdk_gc_set_fill( m_brushGC, fillStyle );
 692
 693   if (m_brush.GetStyle() == wxSTIPPLE)
 694   {
 695     gdk_gc_set_stipple( m_brushGC, m_brush.GetStipple()->GetPixmap() );
 696   }
 697
 698   if (IS_HATCH(m_brush.GetStyle()))
 699   {
 700     int num = m_brush.GetStyle() - wxBDIAGONAL_HATCH;
 701     gdk_gc_set_stipple( m_brushGC, hatches[num] );
 702   }
 703 }
 704
 705 // CMB 21/7/98: Added SetBackground. Sets background brush
 706 // for Clear() and bg colour for shapes filled with cross-hatch brush
 707 void wxPaintDC::SetBackground( const wxBrush &brush )
 708 {
 709   if (!Ok()) return;
 710
 711   if (m_backgroundBrush == brush) return;
 712
 713   m_backgroundBrush = brush;
 714
 715   if (!m_backgroundBrush.Ok()) return;
 716
 717   m_backgroundBrush.GetColour().CalcPixel( m_cmap );
 718   gdk_gc_set_background( m_brushGC, m_backgroundBrush.GetColour().GetColor() );
 719   gdk_gc_set_foreground( m_bgGC, m_backgroundBrush.GetColour().GetColor() );
 720
 721   GdkFill fillStyle = GDK_SOLID;
 722   switch (m_backgroundBrush.GetStyle())
 723   {
 724     case wxSOLID:
 725     case wxTRANSPARENT:
 726       break;
 727     default:
 728       fillStyle = GDK_STIPPLED;
 729   }
 730
 731   gdk_gc_set_fill( m_bgGC, fillStyle );
 732
 733   if (m_backgroundBrush.GetStyle() == wxSTIPPLE)
 734   {
 735     gdk_gc_set_stipple( m_bgGC, m_backgroundBrush.GetStipple()->GetPixmap() );
 736   }
 737
 738   if (IS_HATCH(m_backgroundBrush.GetStyle()))
 739   {
 740     int num = m_backgroundBrush.GetStyle() - wxBDIAGONAL_HATCH;
 741     gdk_gc_set_stipple( m_bgGC, hatches[num] );
 742   }
 743 }
 744
 745 void wxPaintDC::SetLogicalFunction( int function )
 746 {
 747   if (m_logicalFunction == function) return;
 748   GdkFunction mode = GDK_COPY;
 749   switch (function)
 750   {
 751     case wxXOR:    mode = GDK_INVERT; break;
 752     case wxINVERT: mode = GDK_INVERT; break;
 753     default:       break;
 754   }
 755   m_logicalFunction = function;
 756   gdk_gc_set_function( m_penGC, mode );
 757   gdk_gc_set_function( m_brushGC, mode );
 758 }
 759
 760 void wxPaintDC::SetTextForeground( const wxColour &col )
 761 {
 762   if (!Ok()) return;
 763
 764   if (m_textForegroundColour == col) return;
 765
 766   m_textForegroundColour = col;
 767   if (!m_textForegroundColour.Ok()) return;
 768
 769   m_textForegroundColour.CalcPixel( m_cmap );
 770   gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );
 771 }
 772
 773 void wxPaintDC::SetTextBackground( const wxColour &col )
 774 {
 775   if (!Ok()) return;
 776
 777   if (m_textBackgroundColour == col) return;
 778
 779   m_textBackgroundColour = col;
 780   if (!m_textBackgroundColour.Ok()) return;
 781
 782   m_textBackgroundColour.CalcPixel( m_cmap );
 783   gdk_gc_set_background( m_textGC, m_textBackgroundColour.GetColor() );
 784 }
 785
 786 void wxPaintDC::SetBackgroundMode( int mode )
 787 {
 788   m_backgroundMode = mode;
 789
 790   // CMB 21/7/98: fill style of cross-hatch brushes is affected by
 791   // transparent/solid background mode
 792   if (m_brush.GetStyle() != wxSOLID && m_brush.GetStyle() != wxTRANSPARENT)
 793   {
 794     gdk_gc_set_fill( m_brushGC,
 795       (m_backgroundMode == wxTRANSPARENT) ? GDK_STIPPLED : GDK_OPAQUE_STIPPLED);
 796   }
 797 }
 798
 799 void wxPaintDC::SetPalette( const wxPalette& WXUNUSED(palette) )
 800 {
 801 }
 802
 803 void wxPaintDC::SetClippingRegion( long x, long y, long width, long height )
 804 {
 805   wxDC::SetClippingRegion( x, y, width, height );
 806
 807   GdkRectangle rect;
 808   rect.x = XLOG2DEV(x);
 809   rect.y = YLOG2DEV(y);
 810   rect.width = XLOG2DEVREL(width);
 811   rect.height = YLOG2DEVREL(height);
 812   gdk_gc_set_clip_rectangle( m_penGC, &rect );
 813   gdk_gc_set_clip_rectangle( m_brushGC, &rect );
 814   gdk_gc_set_clip_rectangle( m_textGC, &rect );
 815   gdk_gc_set_clip_rectangle( m_bgGC, &rect );
 816
 817 }
 818
 819 void wxPaintDC::DestroyClippingRegion(void)
 820 {
 821   wxDC::DestroyClippingRegion();
 822
 823   gdk_gc_set_clip_rectangle( m_penGC, (GdkRectangle *) NULL );
 824   gdk_gc_set_clip_rectangle( m_brushGC, (GdkRectangle *) NULL );
 825   gdk_gc_set_clip_rectangle( m_textGC, (GdkRectangle *) NULL );
 826   gdk_gc_set_clip_rectangle( m_bgGC, (GdkRectangle *) NULL );
 827 }
 828
 829 void wxPaintDC::SetUpDC(void)
 830 {
 831   Destroy();
 832   m_ok = TRUE;
 833   m_logicalFunction = wxCOPY;
 834   m_penGC = gdk_gc_new( m_window );
 835   m_brushGC = gdk_gc_new( m_window );
 836   m_textGC = gdk_gc_new( m_window );
 837   m_bgGC = gdk_gc_new( m_window );
 838   SetTextForeground( m_textForegroundColour );
 839   SetTextBackground( m_textBackgroundColour );
 840   SetPen( m_pen );
 841   SetFont( m_font );
 842   SetBrush( m_brush );
 843
 844   gdk_gc_set_background( m_penGC, wxWHITE->GetColor() );
 845
 846   if (!hatch_bitmap)
 847   {
 848     hatch_bitmap    = hatches;
 849     hatch_bitmap[0] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, bdiag_bits, bdiag_width, bdiag_height );
 850     hatch_bitmap[1] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, cdiag_bits, cdiag_width, cdiag_height );
 851     hatch_bitmap[2] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, fdiag_bits, fdiag_width, fdiag_height );
 852     hatch_bitmap[3] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, cross_bits, cross_width, cross_height );
 853     hatch_bitmap[4] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, horiz_bits, horiz_width, horiz_height );
 854     hatch_bitmap[5] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, verti_bits, verti_width, verti_height );
 855   }
 856 }
 857
 858 void wxPaintDC::Destroy(void)
 859 {
 860   if (m_penGC) gdk_gc_unref( m_penGC );
 861   m_penGC = (GdkGC*) NULL;
 862   if (m_brushGC) gdk_gc_unref( m_brushGC );
 863   m_brushGC = (GdkGC*) NULL;
 864   if (m_textGC) gdk_gc_unref( m_textGC );
 865   m_textGC = (GdkGC*) NULL;
 866   if (m_bgGC) gdk_gc_unref( m_bgGC );
 867   m_bgGC = (GdkGC*) NULL;
 868 }
 869
 870 GdkWindow *wxPaintDC::GetWindow(void)
 871 {
 872   return m_window;
 873 }
 874
 875 // ----------------------------------- spline code ----------------------------------------
 876
 877 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
 878                          double a3, double b3, double a4, double b4);
 879 void wx_clear_stack(void);
 880 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
 881         double *y3, double *x4, double *y4);
 882 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
 883           double x4, double y4);
 884 static bool wx_spline_add_point(double x, double y);
 885 static void wx_spline_draw_point_array(wxDC *dc);
 886
 887 wxList wx_spline_point_list;
 888
 889 #define         half(z1, z2)    ((z1+z2)/2.0)
 890 #define         THRESHOLD       5
 891
 892 /* iterative version */
 893
 894 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
 895                  double b4)
 896 {
 897     register double  xmid, ymid;
 898     double           x1, y1, x2, y2, x3, y3, x4, y4;
 899
 900     wx_clear_stack();
 901     wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
 902
 903     while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
 904         xmid = (double)half(x2, x3);
 905         ymid = (double)half(y2, y3);
 906         if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
 907             fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
 908             wx_spline_add_point( x1, y1 );
 909             wx_spline_add_point( xmid, ymid );
 910         } else {
 911             wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
 912                  (double)half(x3, x4), (double)half(y3, y4), x4, y4);
 913             wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
 914                  (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
 915         }
 916     }
 917 }
 918
 919 /* utilities used by spline drawing routines */
 920
 921 typedef struct wx_spline_stack_struct {
 922     double           x1, y1, x2, y2, x3, y3, x4, y4;
 923 } Stack;
 924
 925 #define         SPLINE_STACK_DEPTH             20
 926 static Stack    wx_spline_stack[SPLINE_STACK_DEPTH];
 927 static Stack   *wx_stack_top;
 928 static int      wx_stack_count;
 929
 930 void wx_clear_stack(void)
 931 {
 932     wx_stack_top = wx_spline_stack;
 933     wx_stack_count = 0;
 934 }
 935
 936 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
 937 {
 938     wx_stack_top->x1 = x1;
 939     wx_stack_top->y1 = y1;
 940     wx_stack_top->x2 = x2;
 941     wx_stack_top->y2 = y2;
 942     wx_stack_top->x3 = x3;
 943     wx_stack_top->y3 = y3;
 944     wx_stack_top->x4 = x4;
 945     wx_stack_top->y4 = y4;
 946     wx_stack_top++;
 947     wx_stack_count++;
 948 }
 949
 950 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
 951                   double *x3, double *y3, double *x4, double *y4)
 952 {
 953     if (wx_stack_count == 0)
 954         return (0);
 955     wx_stack_top--;
 956     wx_stack_count--;
 957     *x1 = wx_stack_top->x1;
 958     *y1 = wx_stack_top->y1;
 959     *x2 = wx_stack_top->x2;
 960     *y2 = wx_stack_top->y2;
 961     *x3 = wx_stack_top->x3;
 962     *y3 = wx_stack_top->y3;
 963     *x4 = wx_stack_top->x4;
 964     *y4 = wx_stack_top->y4;
 965     return (1);
 966 }
 967
 968 static bool wx_spline_add_point(double x, double y)
 969 {
 970   wxPoint *point = new wxPoint ;
 971   point->x = (int) x;
 972   point->y = (int) y;
 973   wx_spline_point_list.Append((wxObject*)point);
 974   return TRUE;
 975 }
 976
 977 static void wx_spline_draw_point_array(wxDC *dc)
 978 {
 979   dc->DrawLines(&wx_spline_point_list, 0, 0 );
 980   wxNode *node = wx_spline_point_list.First();
 981   while (node)
 982   {
 983     wxPoint *point = (wxPoint *)node->Data();
 984     delete point;
 985     delete node;
 986     node = wx_spline_point_list.First();
 987   }
 988 }
 989
 990 void wxPaintDC::DrawSpline( wxList *points )
 991 {
 992     wxPoint *p;
 993     double           cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
 994     double           x1, y1, x2, y2;
 995
 996     wxNode *node = points->First();
 997     p = (wxPoint *)node->Data();
 998
 999     x1 = p->x;
1000     y1 = p->y;
1001
1002     node = node->Next();
1003     p = (wxPoint *)node->Data();
1004
1005     x2 = p->x;
1006     y2 = p->y;
1007     cx1 = (double)((x1 + x2) / 2);
1008     cy1 = (double)((y1 + y2) / 2);
1009     cx2 = (double)((cx1 + x2) / 2);
1010     cy2 = (double)((cy1 + y2) / 2);
1011
1012     wx_spline_add_point(x1, y1);
1013
1014     while ((node = node->Next()) != NULL)
1015     {
1016         p = (wxPoint *)node->Data();
1017         x1 = x2;
1018         y1 = y2;
1019         x2 = p->x;
1020         y2 = p->y;
1021         cx4 = (double)(x1 + x2) / 2;
1022         cy4 = (double)(y1 + y2) / 2;
1023         cx3 = (double)(x1 + cx4) / 2;
1024         cy3 = (double)(y1 + cy4) / 2;
1025
1026         wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
1027
1028         cx1 = cx4;
1029         cy1 = cy4;
1030         cx2 = (double)(cx1 + x2) / 2;
1031         cy2 = (double)(cy1 + y2) / 2;
1032     }
1033
1034     wx_spline_add_point( cx1, cy1 );
1035     wx_spline_add_point( x2, y2 );
1036
1037     wx_spline_draw_point_array( this );
1038 }