src/gtk1/dcclient.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dcclient.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Created:     01/02/97
   6 // 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
  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 = NULL;
  31
  32 //-----------------------------------------------------------------------------
  33 // constants
  34 //-----------------------------------------------------------------------------
  35
  36 #define RAD2DEG 57.2957795131
  37
  38 //-----------------------------------------------------------------------------
  39 // wxPaintDC
  40 //-----------------------------------------------------------------------------
  41
  42 IMPLEMENT_DYNAMIC_CLASS(wxPaintDC,wxDC)
  43
  44 wxPaintDC::wxPaintDC(void)
  45 {
  46 };
  47
  48 wxPaintDC::wxPaintDC( wxWindow *window )
  49 {
  50   if (!window) return;
  51   GtkWidget *widget = window->m_wxwindow;
  52   if (!widget) return;
  53   m_window = widget->window;
  54   if (!m_window) return;
  55   if (window->m_wxwindow)
  56     m_cmap = gtk_widget_get_colormap( window->m_wxwindow );
  57   else
  58     m_cmap = gtk_widget_get_colormap( window->m_widget );
  59   SetUpDC();
  60
  61   long x = 0;
  62   long y = 0;
  63   window->GetDrawingOffset( &x, &y );
  64   SetInternalDeviceOrigin( -x, -y );
  65 };
  66
  67 wxPaintDC::~wxPaintDC(void)
  68 {
  69 };
  70
  71 void wxPaintDC::FloodFill( long WXUNUSED(x1), long WXUNUSED(y1),
  72   wxColour *WXUNUSED(col), int WXUNUSED(style) )
  73 {
  74 };
  75
  76 bool wxPaintDC::GetPixel( long WXUNUSED(x1), long WXUNUSED(y1), wxColour *WXUNUSED(col) ) const
  77 {
  78   return FALSE;
  79 };
  80
  81 void wxPaintDC::DrawLine( long x1, long y1, long x2, long y2 )
  82 {
  83   if (!Ok()) return;
  84
  85   if (m_pen.GetStyle() != wxTRANSPARENT)
  86   {
  87     gdk_draw_line( m_window, m_penGC,
  88       XLOG2DEV(x1), YLOG2DEV(y1), XLOG2DEV(x2), YLOG2DEV(y2) );
  89   };
  90 };
  91
  92 void wxPaintDC::CrossHair( long x, long y )
  93 {
  94   if (!Ok()) return;
  95
  96   if (m_pen.GetStyle() != wxTRANSPARENT)
  97   {
  98     int w = 0;
  99     int h = 0;
 100     GetSize( &w, &h );
 101     long xx = XLOG2DEV(x);
 102     long yy = YLOG2DEV(y);
 103     gdk_draw_line( m_window, m_penGC,
 104       0, yy, XLOG2DEVREL(w), yy );
 105     gdk_draw_line( m_window, m_penGC,
 106       xx, 0, xx, YLOG2DEVREL(h) );
 107   };
 108 };
 109
 110 void wxPaintDC::DrawArc( long x1, long y1, long x2, long y2, double xc, double yc )
 111 {
 112   if (!Ok()) return;
 113
 114   long xx1 = XLOG2DEV(x1);
 115   long yy1 = YLOG2DEV(y1);
 116   long xx2 = XLOG2DEV(x2);
 117   long yy2 = YLOG2DEV(y2);
 118   long xxc = XLOG2DEV((long)xc);
 119   long yyc = YLOG2DEV((long)yc);
 120   double dx = xx1 - xxc;
 121   double dy = yy1 - yyc;
 122   double radius = sqrt(dx*dx+dy*dy);
 123   long   r      = (long)radius;
 124   double radius1, radius2;
 125
 126   if (xx1 == xx2 && yy1 == yy2)
 127   {
 128     radius1 = 0.0;
 129     radius2 = 360.0;
 130   }
 131   else
 132   if (radius == 0.0)
 133   {
 134     radius1 = radius2 = 0.0;
 135   }
 136   else
 137   {
 138     radius1 = (xx1 - xxc == 0) ?
 139             (yy1 - yyc < 0) ? 90.0 : -90.0 :
 140             -atan2(double(yy1-yyc), double(xx1-xxc)) * RAD2DEG;
 141     radius2 = (xx2 - xxc == 0) ?
 142             (yy2 - yyc < 0) ? 90.0 : -90.0 :
 143             -atan2(double(yy2-yyc), double(xx2-xxc)) * RAD2DEG;
 144   };
 145   long alpha1 = long(radius1 * 64.0);
 146   long alpha2 = long((radius2 - radius1) * 64.0);
 147   while (alpha2 <= 0) alpha2 += 360*64;
 148   while (alpha1 > 360*64) alpha1 -= 360*64;
 149
 150   if (m_brush.GetStyle() != wxTRANSPARENT)
 151     gdk_draw_arc( m_window, m_brushGC, TRUE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
 152
 153   if (m_pen.GetStyle() != wxTRANSPARENT)
 154     gdk_draw_arc( m_window, m_penGC, FALSE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
 155
 156 };
 157
 158 void wxPaintDC::DrawEllipticArc( long x, long y, long width, long height, double sa, double ea )
 159 {
 160   if (!Ok()) return;
 161
 162   if (width<0) { width=-width; x=x-width; }
 163   if (height<0) { height=-height; y=y-height; }
 164
 165   long xx = XLOG2DEV(x);
 166   long yy = YLOG2DEV(y);
 167   long ww = XLOG2DEVREL(width);
 168   long hh = YLOG2DEVREL(height);
 169
 170   if (m_brush.GetStyle() != wxTRANSPARENT)
 171     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww-1, hh-1, 0, long(sa*64) );
 172
 173   if (m_pen.GetStyle() != wxTRANSPARENT)
 174     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, ww, hh, 0, long(ea*64) );
 175 };
 176
 177 void wxPaintDC::DrawPoint( long x, long y )
 178 {
 179   if (!Ok()) return;
 180
 181   if (m_pen.GetStyle() != wxTRANSPARENT)
 182     gdk_draw_point( m_window, m_penGC, XLOG2DEV(x), YLOG2DEV(y) );
 183 };
 184
 185 void wxPaintDC::DrawLines( int n, wxPoint points[], long xoffset, long yoffset )
 186 {
 187   if (!Ok()) return;
 188
 189   if (m_pen.GetStyle() == wxTRANSPARENT) return;
 190
 191   for (int i = 0; i < n-1; i++)
 192   {
 193     long x1 = XLOG2DEV(points[i].x + xoffset);
 194     long x2 = XLOG2DEV(points[i+1].x + xoffset);
 195     long y1 = YLOG2DEV(points[i].y + yoffset);     // oh, what a waste
 196     long y2 = YLOG2DEV(points[i+1].y + yoffset);
 197     gdk_draw_line( m_window, m_brushGC, x1, y1, x2, y2 );
 198   };
 199 };
 200
 201 void wxPaintDC::DrawLines( wxList *points, long xoffset, long yoffset )
 202 {
 203   if (!Ok()) return;
 204
 205   if (m_pen.GetStyle() == wxTRANSPARENT) return;
 206
 207   wxNode *node = points->First();
 208   while (node->Next())
 209   {
 210     wxPoint *point = (wxPoint*)node->Data();
 211     wxPoint *npoint = (wxPoint*)node->Next()->Data();
 212     long x1 = XLOG2DEV(point->x + xoffset);
 213     long x2 = XLOG2DEV(npoint->x + xoffset);
 214     long y1 = YLOG2DEV(point->y + yoffset);    // and again...
 215     long y2 = YLOG2DEV(npoint->y + yoffset);
 216     gdk_draw_line( m_window, m_brushGC, x1, y1, x2, y2 );
 217     node = node->Next();
 218   };
 219 };
 220
 221 void wxPaintDC::DrawPolygon( int WXUNUSED(n), wxPoint WXUNUSED(points)[],
 222   long WXUNUSED(xoffset), long WXUNUSED(yoffset), int WXUNUSED(fillStyle) )
 223 {
 224   if (!Ok()) return;
 225 };
 226
 227 void wxPaintDC::DrawPolygon( wxList *WXUNUSED(lines), long WXUNUSED(xoffset),
 228                              long WXUNUSED(yoffset), int WXUNUSED(fillStyle) )
 229 {
 230   if (!Ok()) return;
 231 };
 232
 233 void wxPaintDC::DrawRectangle( long x, long y, long width, long height )
 234 {
 235   if (!Ok()) return;
 236
 237   long xx = XLOG2DEV(x);
 238   long yy = YLOG2DEV(y);
 239   long ww = XLOG2DEVREL(width);
 240   long hh = YLOG2DEVREL(height);
 241
 242   if (m_brush.GetStyle() != wxTRANSPARENT)
 243     gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy, ww, hh );
 244
 245   if (m_pen.GetStyle() != wxTRANSPARENT)
 246     gdk_draw_rectangle( m_window, m_penGC, FALSE, xx, yy, ww-1, hh-1 );
 247 };
 248
 249 void wxPaintDC::DrawRoundedRectangle( long x, long y, long width, long height, double radius )
 250 {
 251   if (!Ok()) return;
 252
 253   if (width<0) { width=-width; x=x-width; }
 254   if (height<0) { height=-height; y=y-height; }
 255
 256   if (radius < 0.0) radius = - radius * ((width < height) ? width : height);
 257
 258   long xx = XLOG2DEV(x);
 259   long yy = YLOG2DEV(y);
 260   long ww = XLOG2DEVREL(width);
 261   long hh = YLOG2DEVREL(height);
 262   long rr = XLOG2DEVREL((long)radius);
 263   long dd = 2 * rr;
 264
 265   if (m_brush.GetStyle() != wxTRANSPARENT)
 266   {
 267     gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx+rr, yy, ww-dd, hh );
 268     gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy+rr, ww, hh-dd );
 269     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, dd, dd, 90*64, 90*64 );
 270     gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
 271     gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
 272     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
 273   };
 274
 275   if (m_pen.GetStyle() != wxTRANSPARENT)
 276   {
 277     gdk_draw_line( m_window, m_penGC, xx+rr, yy, xx+ww-rr, yy );
 278     gdk_draw_line( m_window, m_penGC, xx+rr, yy+hh, xx+ww-rr, yy+hh );
 279     gdk_draw_line( m_window, m_penGC, xx, yy+rr, xx, yy+hh-rr );
 280     gdk_draw_line( m_window, m_penGC, xx+ww, yy+rr, xx+ww, yy+hh-rr );
 281     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, dd, dd, 90*64, 90*64 );
 282     gdk_draw_arc( m_window, m_penGC, FALSE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
 283     gdk_draw_arc( m_window, m_penGC, FALSE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
 284     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
 285   };
 286 };
 287
 288 void wxPaintDC::DrawEllipse( long x, long y, long width, long height )
 289 {
 290   if (!Ok()) return;
 291
 292   if (width<0) { width=-width; x=x-width; }
 293   if (height<0) { height=-height; y=y-height; }
 294
 295   long xx = XLOG2DEV(x);
 296   long yy = YLOG2DEV(y);
 297   long ww = XLOG2DEVREL(width);
 298   long hh = YLOG2DEVREL(height);
 299
 300   if (m_brush.GetStyle() != wxTRANSPARENT)
 301     gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, 0, 360*64 );
 302
 303   if (m_pen.GetStyle() != wxTRANSPARENT)
 304     gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, ww, hh, 0, 360*64 );
 305 };
 306
 307 bool wxPaintDC::CanDrawBitmap(void) const
 308 {
 309   return TRUE;
 310 };
 311
 312 void wxPaintDC::DrawIcon( const wxIcon &icon, long x, long y, bool useMask )
 313 {
 314   if (!Ok()) return;
 315
 316   if (!icon.Ok()) return;
 317
 318   int xx = XLOG2DEV(x);
 319   int yy = YLOG2DEV(y);
 320
 321   GdkBitmap *mask = NULL;
 322   if (icon.GetMask()) mask = icon.GetMask()->GetBitmap();
 323
 324   if (useMask && mask)
 325   {
 326     gdk_gc_set_clip_mask( m_penGC, mask );
 327     gdk_gc_set_clip_origin( m_penGC, xx, yy );
 328   };
 329
 330   GdkPixmap *pm = icon.GetPixmap();
 331   gdk_draw_pixmap( m_window, m_penGC, pm, 0, 0, xx, yy, -1, -1 );
 332
 333   if (useMask && mask)
 334   {
 335     gdk_gc_set_clip_mask( m_penGC, NULL );
 336     gdk_gc_set_clip_origin( m_penGC, 0, 0 );
 337   };
 338 };
 339
 340 bool wxPaintDC::Blit( long xdest, long ydest, long width, long height,
 341        wxDC *source, long xsrc, long ysrc, int WXUNUSED(logical_func), bool WXUNUSED(useMask) )
 342 {
 343   if (!Ok()) return FALSE;
 344
 345   wxClientDC *csrc = (wxClientDC*)source;
 346
 347   gdk_window_copy_area ( m_window, m_penGC,
 348     XLOG2DEV(xdest), YLOG2DEV(ydest),
 349     csrc->GetWindow(),
 350     source->DeviceToLogicalX(xsrc), source->DeviceToLogicalY(ysrc),
 351     source->DeviceToLogicalXRel(width), source->DeviceToLogicalYRel(height) );
 352
 353 /*
 354   gdk_window_copy_area ( m_window, m_penGC,
 355     XLOG2DEV(xdest), YLOG2DEV(ydest),
 356     csrc->GetWindow(),
 357     xsrc, ysrc,
 358     width, height );
 359 */
 360
 361   return TRUE;
 362 };
 363
 364 void wxPaintDC::DrawText( const wxString &text, long x, long y, bool WXUNUSED(use16) )
 365 {
 366   if (!Ok()) return;
 367
 368   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 369   gdk_draw_string( m_window, font, m_textGC,
 370     XLOG2DEV(x),
 371     YLOG2DEV(y) + font->ascent, text );
 372 };
 373
 374 bool wxPaintDC::CanGetTextExtent(void) const
 375 {
 376   return TRUE;
 377 };
 378
 379 void wxPaintDC::GetTextExtent( const wxString &string, long *width, long *height,
 380                      long *WXUNUSED(descent), long *WXUNUSED(externalLeading),
 381                      wxFont *WXUNUSED(theFont), bool WXUNUSED(use16) )
 382 {
 383   if (!Ok()) return;
 384
 385   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 386   if (width) (*width) = gdk_string_width( font, string );
 387   if (height) (*height) = font->ascent + font->descent;
 388 };
 389
 390 long wxPaintDC::GetCharWidth(void)
 391 {
 392   if (!Ok()) return 0;
 393
 394   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 395   return gdk_string_width( font, "H" );
 396 };
 397
 398 long wxPaintDC::GetCharHeight(void)
 399 {
 400   if (!Ok()) return 0;
 401
 402   GdkFont *font = m_font.GetInternalFont( m_scaleY );
 403   return font->ascent + font->descent;
 404 };
 405
 406 void wxPaintDC::Clear(void)
 407 {
 408   if (!Ok()) return;
 409
 410   DestroyClippingRegion();
 411   gdk_window_clear( m_window );
 412 };
 413
 414 void wxPaintDC::SetFont( const wxFont &font )
 415 {
 416   if (!Ok()) return;
 417
 418   m_font = font;
 419 };
 420
 421 void wxPaintDC::SetPen( const wxPen &pen )
 422 {
 423   if (!Ok()) return;
 424
 425   if (m_pen == pen) return;
 426
 427   m_pen = pen;
 428
 429   if (!m_pen.Ok()) return;
 430
 431   gint width = m_pen.GetWidth();
 432
 433   GdkLineStyle lineStyle = GDK_LINE_SOLID;
 434   switch (m_pen.GetStyle())
 435   {
 436     case wxSOLID:      { lineStyle = GDK_LINE_SOLID;       break; };
 437     case wxDOT:        { lineStyle = GDK_LINE_ON_OFF_DASH; break; };
 438     case wxLONG_DASH:  { lineStyle = GDK_LINE_ON_OFF_DASH; break; };
 439     case wxSHORT_DASH: { lineStyle = GDK_LINE_ON_OFF_DASH; break; };
 440     case wxDOT_DASH:   { lineStyle = GDK_LINE_DOUBLE_DASH; break; };
 441   };
 442
 443   GdkCapStyle capStyle = GDK_CAP_ROUND;
 444   switch (m_pen.GetCap())
 445   {
 446     case wxCAP_ROUND:      { capStyle = GDK_CAP_ROUND;      break; };
 447     case wxCAP_PROJECTING: { capStyle = GDK_CAP_PROJECTING; break; };
 448     case wxCAP_BUTT:       { capStyle = GDK_CAP_BUTT;       break; };
 449   };
 450
 451   GdkJoinStyle joinStyle = GDK_JOIN_ROUND;
 452   switch (m_pen.GetJoin())
 453   {
 454     case wxJOIN_BEVEL: { joinStyle = GDK_JOIN_BEVEL; break; };
 455     case wxJOIN_ROUND: { joinStyle = GDK_JOIN_ROUND; break; };
 456     case wxJOIN_MITER: { joinStyle = GDK_JOIN_MITER; break; };
 457   };
 458
 459   gdk_gc_set_line_attributes( m_penGC, width, lineStyle, capStyle, joinStyle );
 460
 461   m_pen.GetColour().CalcPixel( m_cmap );
 462   gdk_gc_set_foreground( m_penGC, m_pen.GetColour().GetColor() );
 463 };
 464
 465 void wxPaintDC::SetBrush( const wxBrush &brush )
 466 {
 467   if (!Ok()) return;
 468
 469   if (m_brush == brush) return;
 470
 471   m_brush = brush;
 472
 473   if (!m_brush.Ok()) return;
 474
 475   m_brush.GetColour().CalcPixel( m_cmap );
 476   gdk_gc_set_foreground( m_brushGC, m_brush.GetColour().GetColor() );
 477
 478   GdkFill fillStyle = GDK_SOLID;
 479   switch (m_brush.GetStyle())
 480   {
 481     case wxSOLID:
 482     case wxTRANSPARENT:
 483       break;
 484     default:
 485       fillStyle = GDK_STIPPLED;
 486   };
 487
 488   gdk_gc_set_fill( m_brushGC, fillStyle );
 489
 490   if (m_brush.GetStyle() == wxSTIPPLE)
 491   {
 492     gdk_gc_set_stipple( m_brushGC, m_brush.GetStipple()->GetPixmap() );
 493   };
 494
 495   if (IS_HATCH(m_brush.GetStyle()))
 496   {
 497     int num = m_brush.GetStyle() - wxBDIAGONAL_HATCH;
 498     gdk_gc_set_stipple( m_brushGC, hatches[num] );
 499   };
 500 };
 501
 502 void wxPaintDC::SetLogicalFunction( int function )
 503 {
 504   if (m_logicalFunction == function) return;
 505   GdkFunction mode = GDK_COPY;
 506   switch (function)
 507   {
 508     case wxXOR:    mode = GDK_INVERT; break;
 509     case wxINVERT: mode = GDK_INVERT; break;
 510     default:       break;
 511   };
 512   m_logicalFunction = function;
 513   gdk_gc_set_function( m_penGC, mode );
 514   gdk_gc_set_function( m_brushGC, mode );
 515 };
 516
 517 void wxPaintDC::SetTextForeground( const wxColour &col )
 518 {
 519   if (!Ok()) return;
 520
 521   if (m_textForegroundColour == col) return;
 522
 523   m_textForegroundColour = col;
 524   if (!m_textForegroundColour.Ok()) return;
 525
 526   m_textForegroundColour.CalcPixel( m_cmap );
 527   gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );
 528 };
 529
 530 void wxPaintDC::SetTextBackground( const wxColour &col )
 531 {
 532   if (!Ok()) return;
 533
 534   if (m_textBackgroundColour == col) return;
 535
 536   m_textBackgroundColour = col;
 537   if (!m_textBackgroundColour.Ok()) return;
 538
 539   m_textBackgroundColour.CalcPixel( m_cmap );
 540   gdk_gc_set_background( m_textGC, m_textBackgroundColour.GetColor() );
 541 };
 542
 543 void wxPaintDC::SetBackgroundMode( int WXUNUSED(mode) )
 544 {
 545 };
 546
 547 void wxPaintDC::SetPalette( const wxPalette& WXUNUSED(palette) )
 548 {
 549 };
 550
 551 void wxPaintDC::SetClippingRegion( long x, long y, long width, long height )
 552 {
 553   wxDC::SetClippingRegion( x, y, width, height );
 554
 555   GdkRectangle rect;
 556   rect.x = XLOG2DEV(x);
 557   rect.y = YLOG2DEV(y);
 558   rect.width = XLOG2DEV(x+width);
 559   rect.height = YLOG2DEV(y+height);
 560   gdk_gc_set_clip_rectangle( m_penGC, &rect );
 561   gdk_gc_set_clip_rectangle( m_brushGC, &rect );
 562   gdk_gc_set_clip_rectangle( m_textGC, &rect );
 563   gdk_gc_set_clip_rectangle( m_bgGC, &rect );
 564
 565 };
 566
 567 void wxPaintDC::DestroyClippingRegion(void)
 568 {
 569   wxDC::DestroyClippingRegion();
 570
 571   gdk_gc_set_clip_rectangle( m_penGC, NULL );
 572   gdk_gc_set_clip_rectangle( m_brushGC, NULL );
 573   gdk_gc_set_clip_rectangle( m_textGC, NULL );
 574   gdk_gc_set_clip_rectangle( m_bgGC, NULL );
 575 };
 576
 577 void wxPaintDC::SetUpDC(void)
 578 {
 579   m_ok = TRUE;
 580   m_logicalFunction = wxCOPY;
 581   m_penGC = gdk_gc_new( m_window );
 582   m_brushGC = gdk_gc_new( m_window );
 583   m_textGC = gdk_gc_new( m_window );
 584   m_bgGC = gdk_gc_new( m_window );
 585   SetTextForeground( m_textForegroundColour );
 586   SetTextBackground( m_textBackgroundColour );
 587   SetPen( m_pen );
 588   SetFont( m_font );
 589   SetBrush( m_brush );
 590
 591   gdk_gc_set_background( m_penGC, wxWHITE->GetColor() );
 592
 593   if (!hatch_bitmap)
 594   {
 595     hatch_bitmap    = hatches;
 596     hatch_bitmap[0] = gdk_bitmap_create_from_data( NULL, bdiag_bits, bdiag_width, bdiag_height );
 597     hatch_bitmap[1] = gdk_bitmap_create_from_data( NULL, cdiag_bits, cdiag_width, cdiag_height );
 598     hatch_bitmap[2] = gdk_bitmap_create_from_data( NULL, fdiag_bits, fdiag_width, fdiag_height );
 599     hatch_bitmap[3] = gdk_bitmap_create_from_data( NULL, cross_bits, cross_width, cross_height );
 600     hatch_bitmap[4] = gdk_bitmap_create_from_data( NULL, horiz_bits, horiz_width, horiz_height );
 601     hatch_bitmap[5] = gdk_bitmap_create_from_data( NULL, verti_bits, verti_width, verti_height );
 602   };
 603 };
 604
 605 GdkWindow *wxPaintDC::GetWindow(void)
 606 {
 607   return m_window;
 608 };
 609
 610 // ----------------------------------- spline code ----------------------------------------
 611
 612 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
 613                          double a3, double b3, double a4, double b4);
 614 void wx_clear_stack(void);
 615 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
 616         double *y3, double *x4, double *y4);
 617 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
 618           double x4, double y4);
 619 static bool wx_spline_add_point(double x, double y);
 620 static void wx_spline_draw_point_array(wxDC *dc);
 621
 622 wxList wx_spline_point_list;
 623
 624 #define         half(z1, z2)    ((z1+z2)/2.0)
 625 #define         THRESHOLD       5
 626
 627 /* iterative version */
 628
 629 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
 630                  double b4)
 631 {
 632     register double  xmid, ymid;
 633     double           x1, y1, x2, y2, x3, y3, x4, y4;
 634
 635     wx_clear_stack();
 636     wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
 637
 638     while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
 639         xmid = (double)half(x2, x3);
 640         ymid = (double)half(y2, y3);
 641         if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
 642             fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
 643             wx_spline_add_point( x1, y1 );
 644             wx_spline_add_point( xmid, ymid );
 645         } else {
 646             wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
 647                  (double)half(x3, x4), (double)half(y3, y4), x4, y4);
 648             wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
 649                  (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
 650         }
 651     }
 652 }
 653
 654 /* utilities used by spline drawing routines */
 655
 656 typedef struct wx_spline_stack_struct {
 657     double           x1, y1, x2, y2, x3, y3, x4, y4;
 658 } Stack;
 659
 660 #define         SPLINE_STACK_DEPTH             20
 661 static Stack    wx_spline_stack[SPLINE_STACK_DEPTH];
 662 static Stack   *wx_stack_top;
 663 static int      wx_stack_count;
 664
 665 void wx_clear_stack(void)
 666 {
 667     wx_stack_top = wx_spline_stack;
 668     wx_stack_count = 0;
 669 }
 670
 671 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
 672 {
 673     wx_stack_top->x1 = x1;
 674     wx_stack_top->y1 = y1;
 675     wx_stack_top->x2 = x2;
 676     wx_stack_top->y2 = y2;
 677     wx_stack_top->x3 = x3;
 678     wx_stack_top->y3 = y3;
 679     wx_stack_top->x4 = x4;
 680     wx_stack_top->y4 = y4;
 681     wx_stack_top++;
 682     wx_stack_count++;
 683 }
 684
 685 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
 686                   double *x3, double *y3, double *x4, double *y4)
 687 {
 688     if (wx_stack_count == 0)
 689         return (0);
 690     wx_stack_top--;
 691     wx_stack_count--;
 692     *x1 = wx_stack_top->x1;
 693     *y1 = wx_stack_top->y1;
 694     *x2 = wx_stack_top->x2;
 695     *y2 = wx_stack_top->y2;
 696     *x3 = wx_stack_top->x3;
 697     *y3 = wx_stack_top->y3;
 698     *x4 = wx_stack_top->x4;
 699     *y4 = wx_stack_top->y4;
 700     return (1);
 701 }
 702
 703 static bool wx_spline_add_point(double x, double y)
 704 {
 705   wxPoint *point = new wxPoint ;
 706   point->x = (int) x;
 707   point->y = (int) y;
 708   wx_spline_point_list.Append((wxObject*)point);
 709   return TRUE;
 710 }
 711
 712 static void wx_spline_draw_point_array(wxDC *dc)
 713 {
 714   dc->DrawLines(&wx_spline_point_list, 0, 0 );
 715   wxNode *node = wx_spline_point_list.First();
 716   while (node)
 717   {
 718     wxPoint *point = (wxPoint *)node->Data();
 719     delete point;
 720     delete node;
 721     node = wx_spline_point_list.First();
 722   }
 723 }
 724
 725 void wxPaintDC::DrawOpenSpline( wxList *points )
 726 {
 727     wxPoint *p;
 728     double           cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
 729     double           x1, y1, x2, y2;
 730
 731     wxNode *node = points->First();
 732     p = (wxPoint *)node->Data();
 733
 734     x1 = p->x;
 735     y1 = p->y;
 736
 737     node = node->Next();
 738     p = (wxPoint *)node->Data();
 739
 740     x2 = p->x;
 741     y2 = p->y;
 742     cx1 = (double)((x1 + x2) / 2);
 743     cy1 = (double)((y1 + y2) / 2);
 744     cx2 = (double)((cx1 + x2) / 2);
 745     cy2 = (double)((cy1 + y2) / 2);
 746
 747     wx_spline_add_point(x1, y1);
 748
 749     while ((node = node->Next()) != NULL)
 750     {
 751         p = (wxPoint *)node->Data();
 752         x1 = x2;
 753         y1 = y2;
 754         x2 = p->x;
 755         y2 = p->y;
 756         cx4 = (double)(x1 + x2) / 2;
 757         cy4 = (double)(y1 + y2) / 2;
 758         cx3 = (double)(x1 + cx4) / 2;
 759         cy3 = (double)(y1 + cy4) / 2;
 760
 761         wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
 762
 763         cx1 = cx4;
 764         cy1 = cy4;
 765         cx2 = (double)(cx1 + x2) / 2;
 766         cy2 = (double)(cy1 + y2) / 2;
 767     }
 768
 769     wx_spline_add_point( cx1, cy1 );
 770     wx_spline_add_point( x2, y2 );
 771
 772     wx_spline_draw_point_array( this );
 773 };