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 #include "wx/image.h"
  17 #include <math.h>
  18
  19 #include "gdk/gdk.h"
  20 #include "gtk/gtk.h"
  21
  22 //-----------------------------------------------------------------------------
  23 // local data
  24 //-----------------------------------------------------------------------------
  25
  26 #include "bdiag.xbm"
  27 #include "fdiag.xbm"
  28 #include "cdiag.xbm"
  29 #include "horiz.xbm"
  30 #include "verti.xbm"
  31 #include "cross.xbm"
  32 #define  num_hatches 6
  33
  34 static GdkPixmap  *hatches[num_hatches];
  35 static GdkPixmap **hatch_bitmap = (GdkPixmap **) NULL;
  36
  37 //-----------------------------------------------------------------------------
  38 // constants
  39 //-----------------------------------------------------------------------------
  40
  41 #define RAD2DEG 57.2957795131
  42
  43 //-----------------------------------------------------------------------------
  44 // temporary implementation of the missing GDK function
  45 //-----------------------------------------------------------------------------
  46 #include "gdk/gdkprivate.h"
  47 void gdk_draw_bitmap     (GdkDrawable  *drawable,
  48                           GdkGC        *gc,
  49                           GdkDrawable  *src,
  50                           gint          xsrc,
  51                           gint          ysrc,
  52                           gint          xdest,
  53                           gint          ydest,
  54                           gint          width,
  55                           gint          height)
  56 {
  57     GdkWindowPrivate *drawable_private;
  58     GdkWindowPrivate *src_private;
  59     GdkGCPrivate *gc_private;
  60
  61     g_return_if_fail (drawable != NULL);
  62     g_return_if_fail (src != NULL);
  63     g_return_if_fail (gc != NULL);
  64
  65     drawable_private = (GdkWindowPrivate*) drawable;
  66     src_private = (GdkWindowPrivate*) src;
  67     if (drawable_private->destroyed || src_private->destroyed)
  68         return;
  69
  70     gc_private = (GdkGCPrivate*) gc;
  71
  72     if (width == -1) width = src_private->width;
  73     if (height == -1) height = src_private->height;
  74
  75     XCopyPlane( drawable_private->xdisplay,
  76                 src_private->xwindow,
  77                 drawable_private->xwindow,
  78                 gc_private->xgc,
  79                 xsrc, ysrc,
  80                 width, height,
  81                 xdest, ydest,
  82                 1 );
  83 }
  84
  85 //-----------------------------------------------------------------------------
  86 // wxWindowDC
  87 //-----------------------------------------------------------------------------
  88
  89 IMPLEMENT_DYNAMIC_CLASS(wxWindowDC,wxDC)
  90
  91 wxWindowDC::wxWindowDC()
  92 {
  93     m_penGC = (GdkGC *) NULL;
  94     m_brushGC = (GdkGC *) NULL;
  95     m_textGC = (GdkGC *) NULL;
  96     m_bgGC = (GdkGC *) NULL;
  97     m_cmap = (GdkColormap *) NULL;
  98     m_isMemDC = FALSE;
  99     m_owner = (wxWindow *)NULL;
 100 }
 101
 102 wxWindowDC::wxWindowDC( wxWindow *window )
 103 {
 104     m_penGC = (GdkGC *) NULL;
 105     m_brushGC = (GdkGC *) NULL;
 106     m_textGC = (GdkGC *) NULL;
 107     m_bgGC = (GdkGC *) NULL;
 108     m_cmap = (GdkColormap *) NULL;
 109     m_owner = (wxWindow *)NULL;
 110
 111     if (!window) return;
 112     GtkWidget *widget = window->m_wxwindow;
 113     if (!widget) return;
 114     m_window = widget->window;
 115     if (!m_window) return;
 116     if (window->m_wxwindow)
 117         m_cmap = gtk_widget_get_colormap( window->m_wxwindow );
 118     else
 119         m_cmap = gtk_widget_get_colormap( window->m_widget );
 120
 121     m_isMemDC = FALSE;
 122
 123     SetUpDC();
 124
 125     /* this must be done after SetUpDC, bacause SetUpDC calls the
 126        repective SetBrush, SetPen, SetBackground etc functions
 127        to set up the DC. SetBackground call m_owner->SetBackground
 128        and this might not be desired as the standard dc background
 129        is white whereas a window might assume gray to be the
 130        standard (as e.g. wxStatusBar) */
 131
 132     m_owner = window;
 133 }
 134
 135 wxWindowDC::~wxWindowDC()
 136 {
 137     Destroy();
 138 }
 139
 140 void wxWindowDC::FloodFill( long WXUNUSED(x), long WXUNUSED(y),
 141                            const wxColour &WXUNUSED(col), int WXUNUSED(style) )
 142 {
 143     wxFAIL_MSG( "wxWindowDC::FloodFill not implemented" );
 144 }
 145
 146 bool wxWindowDC::GetPixel( long WXUNUSED(x1), long WXUNUSED(y1), wxColour *WXUNUSED(col) ) const
 147 {
 148     wxFAIL_MSG( "wxWindowDC::GetPixel not implemented" );
 149     return FALSE;
 150 }
 151
 152 void wxWindowDC::DrawLine( long x1, long y1, long x2, long y2 )
 153 {
 154     wxCHECK_RET( Ok(), "invalid window dc" );
 155
 156     if (m_pen.GetStyle() != wxTRANSPARENT)
 157     {
 158         gdk_draw_line( m_window, m_penGC,
 159                        XLOG2DEV(x1), YLOG2DEV(y1), XLOG2DEV(x2), YLOG2DEV(y2) );
 160
 161         CalcBoundingBox(x1, y1);
 162         CalcBoundingBox(x2, y2);
 163     }
 164 }
 165
 166 void wxWindowDC::CrossHair( long x, long y )
 167 {
 168     wxCHECK_RET( Ok(), "invalid window dc" );
 169
 170     if (m_pen.GetStyle() != wxTRANSPARENT)
 171     {
 172         int w = 0;
 173         int h = 0;
 174         GetSize( &w, &h );
 175         long xx = XLOG2DEV(x);
 176         long yy = YLOG2DEV(y);
 177         gdk_draw_line( m_window, m_penGC, 0, yy, XLOG2DEVREL(w), yy );
 178         gdk_draw_line( m_window, m_penGC, xx, 0, xx, YLOG2DEVREL(h) );
 179     }
 180 }
 181
 182 void wxWindowDC::DrawArc( long x1, long y1, long x2, long y2, double xc, double yc )
 183 {
 184     wxCHECK_RET( Ok(), "invalid window dc" );
 185
 186     long xx1 = XLOG2DEV(x1);
 187     long yy1 = YLOG2DEV(y1);
 188     long xx2 = XLOG2DEV(x2);
 189     long yy2 = YLOG2DEV(y2);
 190     long xxc = XLOG2DEV((long)xc);
 191     long yyc = YLOG2DEV((long)yc);
 192     double dx = xx1 - xxc;
 193     double dy = yy1 - yyc;
 194     double radius = sqrt(dx*dx+dy*dy);
 195     long   r      = (long)radius;
 196     double radius1, radius2;
 197
 198     if (xx1 == xx2 && yy1 == yy2)
 199     {
 200         radius1 = 0.0;
 201         radius2 = 360.0;
 202     }
 203     else
 204     if (radius == 0.0)
 205     {
 206         radius1 = radius2 = 0.0;
 207     }
 208     else
 209     {
 210         radius1 = (xx1 - xxc == 0) ?
 211             (yy1 - yyc < 0) ? 90.0 : -90.0 :
 212             -atan2(double(yy1-yyc), double(xx1-xxc)) * RAD2DEG;
 213         radius2 = (xx2 - xxc == 0) ?
 214             (yy2 - yyc < 0) ? 90.0 : -90.0 :
 215             -atan2(double(yy2-yyc), double(xx2-xxc)) * RAD2DEG;
 216     }
 217     long alpha1 = long(radius1 * 64.0);
 218     long alpha2 = long((radius2 - radius1) * 64.0);
 219     while (alpha2 <= 0) alpha2 += 360*64;
 220     while (alpha1 > 360*64) alpha1 -= 360*64;
 221
 222     if (m_brush.GetStyle() != wxTRANSPARENT)
 223         gdk_draw_arc( m_window, m_brushGC, TRUE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
 224
 225     if (m_pen.GetStyle() != wxTRANSPARENT)
 226         gdk_draw_arc( m_window, m_penGC, FALSE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
 227
 228     CalcBoundingBox (x1, y1);
 229     CalcBoundingBox (x2, y2);
 230 }
 231
 232 void wxWindowDC::DrawEllipticArc( long x, long y, long width, long height, double sa, double ea )
 233 {
 234     wxCHECK_RET( Ok(), "invalid window dc" );
 235
 236     long xx = XLOG2DEV(x);
 237     long yy = YLOG2DEV(y);
 238     long ww = m_signX * XLOG2DEVREL(width);
 239     long hh = m_signY * YLOG2DEVREL(height);
 240
 241     // CMB: handle -ve width and/or height
 242     if (ww < 0) { ww = -ww; xx = xx - ww; }
 243     if (hh < 0) { hh = -hh; yy = yy - hh; }
 244
 245     long start = long(sa * 64.0);
 246     long end = long(ea * 64.0);
 247     if (m_brush.GetStyle() != wxTRANSPARENT)
 248         gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, start, end );
 249
 250     if (m_pen.GetStyle() != wxTRANSPARENT)
 251         gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, ww, hh, start, end );
 252
 253     CalcBoundingBox (x, y);
 254     CalcBoundingBox (x + width, y + height);
 255 }
 256
 257 void wxWindowDC::DrawPoint( long x, long y )
 258 {
 259     wxCHECK_RET( Ok(), "invalid window dc" );
 260
 261     if (m_pen.GetStyle() != wxTRANSPARENT)
 262         gdk_draw_point( m_window, m_penGC, XLOG2DEV(x), YLOG2DEV(y) );
 263
 264     CalcBoundingBox (x, y);
 265 }
 266
 267 void wxWindowDC::DrawLines( int n, wxPoint points[], long xoffset, long yoffset )
 268 {
 269     wxCHECK_RET( Ok(), "invalid window dc" );
 270
 271     if (m_pen.GetStyle() == wxTRANSPARENT) return;
 272     if (n <= 0) return;
 273
 274     CalcBoundingBox( points[0].x + xoffset, points[0].y + yoffset );
 275
 276     for (int i = 0; i < n-1; i++)
 277     {
 278         long x1 = XLOG2DEV(points[i].x + xoffset);
 279         long x2 = XLOG2DEV(points[i+1].x + xoffset);
 280         long y1 = YLOG2DEV(points[i].y + yoffset);     // oh, what a waste
 281         long y2 = YLOG2DEV(points[i+1].y + yoffset);
 282         gdk_draw_line( m_window, m_penGC, x1, y1, x2, y2 );
 283
 284         CalcBoundingBox( points[i+1].x + xoffset, points[i+1].y + yoffset );
 285     }
 286 }
 287
 288 void wxWindowDC::DrawLines( wxList *points, long xoffset, long yoffset )
 289 {
 290     wxCHECK_RET( Ok(), "invalid window dc" );
 291
 292     if (m_pen.GetStyle() == wxTRANSPARENT) return;
 293
 294     wxNode *node = points->First();
 295     if (!node) return;
 296
 297     wxPoint *pt = (wxPoint*)node->Data();
 298     CalcBoundingBox( pt->x + xoffset, pt->y + yoffset );
 299
 300     while (node->Next())
 301     {
 302         wxPoint *point = (wxPoint*)node->Data();
 303         wxPoint *npoint = (wxPoint*)node->Next()->Data();
 304         long x1 = XLOG2DEV(point->x + xoffset);
 305         long x2 = XLOG2DEV(npoint->x + xoffset);
 306         long y1 = YLOG2DEV(point->y + yoffset);    // and a waste again...
 307         long y2 = YLOG2DEV(npoint->y + yoffset);
 308         gdk_draw_line( m_window, m_penGC, x1, y1, x2, y2 );
 309         node = node->Next();
 310
 311         CalcBoundingBox( npoint->x + xoffset, npoint->y + yoffset );
 312     }
 313 }
 314
 315 void wxWindowDC::DrawPolygon( int n, wxPoint points[], long xoffset, long yoffset, int WXUNUSED(fillStyle) )
 316 {
 317     wxCHECK_RET( Ok(), "invalid window dc" );
 318
 319     if (n <= 0) return;
 320
 321     GdkPoint *gdkpoints = new GdkPoint[n+1];
 322     int i;
 323     for (i = 0 ; i < n ; i++)
 324     {
 325         gdkpoints[i].x = XLOG2DEV(points[i].x + xoffset);
 326         gdkpoints[i].y = YLOG2DEV(points[i].y + yoffset);
 327
 328         CalcBoundingBox( points[i].x + xoffset, points[i].y + yoffset );
 329     }
 330
 331     if (m_brush.GetStyle() != wxTRANSPARENT)
 332         gdk_draw_polygon (m_window, m_brushGC, TRUE, gdkpoints, n);
 333
 334     // To do: Fillstyle
 335
 336     if (m_pen.GetStyle() != wxTRANSPARENT)
 337         for (i = 0 ; i < n ; i++)
 338         {
 339             gdk_draw_line( m_window, m_penGC,
 340                            gdkpoints[i%n].x,
 341                            gdkpoints[i%n].y,
 342                            gdkpoints[(i+1)%n].x,
 343                            gdkpoints[(i+1)%n].y);
 344         }
 345
 346     delete[] gdkpoints;
 347 }
 348
 349 void wxWindowDC::DrawPolygon( wxList *lines, long xoffset, long yoffset, int WXUNUSED(fillStyle))
 350 {
 351     wxCHECK_RET( Ok(), "invalid window dc" );
 352
 353     int n = lines->Number();
 354     if (n <= 0) return;
 355
 356     GdkPoint *gdkpoints = new GdkPoint[n];
 357     wxNode *node = lines->First();
 358     int cnt = 0;
 359     while (node)
 360     {
 361         wxPoint *p = (wxPoint *) node->Data();
 362         gdkpoints[cnt].x = XLOG2DEV(p->x + xoffset);
 363         gdkpoints[cnt].y = YLOG2DEV(p->y + yoffset);
 364         node = node->Next();
 365         cnt++;
 366
 367         CalcBoundingBox( p->x + xoffset, p->y + yoffset );
 368     }
 369
 370     if (m_brush.GetStyle() != wxTRANSPARENT)
 371         gdk_draw_polygon (m_window, m_brushGC, TRUE, gdkpoints, n);
 372
 373     // To do: Fillstyle
 374
 375     if (m_pen.GetStyle() != wxTRANSPARENT)
 376     {
 377         int i;
 378         for (i = 0 ; i < n ; i++)
 379         {
 380             gdk_draw_line( m_window, m_penGC,
 381                            gdkpoints[i%n].x,
 382                            gdkpoints[i%n].y,
 383                            gdkpoints[(i+1)%n].x,
 384                            gdkpoints[(i+1)%n].y );
 385         }
 386     }
 387     delete[] gdkpoints;
 388 }
 389
 390 void wxWindowDC::DrawRectangle( long x, long y, long width, long height )
 391 {
 392     wxCHECK_RET( Ok(), "invalid window dc" );
 393
 394     long xx = XLOG2DEV(x);
 395     long yy = YLOG2DEV(y);
 396     long ww = m_signX * XLOG2DEVREL(width);
 397     long hh = m_signY * YLOG2DEVREL(height);
 398
 399     // CMB: draw nothing if transformed w or h is 0
 400     if (ww == 0 || hh == 0) return;
 401
 402     // CMB: handle -ve width and/or height
 403     if (ww < 0) { ww = -ww; xx = xx - ww; }
 404     if (hh < 0) { hh = -hh; yy = yy - hh; }
 405
 406     if (m_brush.GetStyle() != wxTRANSPARENT)
 407       gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy, ww, hh );
 408
 409     if (m_pen.GetStyle() != wxTRANSPARENT)
 410       gdk_draw_rectangle( m_window, m_penGC, FALSE, xx, yy, ww-1, hh-1 );
 411
 412     CalcBoundingBox( x, y );
 413     CalcBoundingBox( x + width, y + height );
 414 }
 415
 416 void wxWindowDC::DrawRoundedRectangle( long x, long y, long width, long height, double radius )
 417 {
 418     wxCHECK_RET( Ok(), "invalid window dc" );
 419
 420     if (radius < 0.0) radius = - radius * ((width < height) ? width : height);
 421
 422     long xx = XLOG2DEV(x);
 423     long yy = YLOG2DEV(y);
 424     long ww = m_signX * XLOG2DEVREL(width);
 425     long hh = m_signY * YLOG2DEVREL(height);
 426     long rr = XLOG2DEVREL((long)radius);
 427
 428     // CMB: handle -ve width and/or height
 429     if (ww < 0) { ww = -ww; xx = xx - ww; }
 430     if (hh < 0) { hh = -hh; yy = yy - hh; }
 431
 432     // CMB: if radius is zero use DrawRectangle() instead to avoid
 433     // X drawing errors with small radii
 434     if (rr == 0)
 435     {
 436         DrawRectangle( x, y, width, height );
 437         return;
 438     }
 439
 440     // CMB: draw nothing if transformed w or h is 0
 441     if (ww == 0 || hh == 0) return;
 442
 443     // CMB: adjust size if outline is drawn otherwise the result is
 444     // 1 pixel too wide and high
 445     if (m_pen.GetStyle() != wxTRANSPARENT)
 446     {
 447         ww--;
 448         hh--;
 449     }
 450
 451     // CMB: ensure dd is not larger than rectangle otherwise we
 452     // get an hour glass shape
 453     long dd = 2 * rr;
 454     if (dd > ww) dd = ww;
 455     if (dd > hh) dd = hh;
 456     rr = dd / 2;
 457
 458     if (m_brush.GetStyle() != wxTRANSPARENT)
 459     {
 460         gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx+rr, yy, ww-dd+1, hh );
 461         gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy+rr, ww, hh-dd+1 );
 462         gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, dd, dd, 90*64, 90*64 );
 463         gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
 464         gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
 465         gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
 466     }
 467
 468     if (m_pen.GetStyle() != wxTRANSPARENT)
 469     {
 470         gdk_draw_line( m_window, m_penGC, xx+rr, yy, xx+ww-rr, yy );
 471         gdk_draw_line( m_window, m_penGC, xx+rr, yy+hh, xx+ww-rr, yy+hh );
 472         gdk_draw_line( m_window, m_penGC, xx, yy+rr, xx, yy+hh-rr );
 473         gdk_draw_line( m_window, m_penGC, xx+ww, yy+rr, xx+ww, yy+hh-rr );
 474         gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, dd, dd, 90*64, 90*64 );
 475         gdk_draw_arc( m_window, m_penGC, FALSE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
 476         gdk_draw_arc( m_window, m_penGC, FALSE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
 477         gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
 478     }
 479
 480     // this ignores the radius
 481     CalcBoundingBox( x, y );
 482     CalcBoundingBox( x + width, y + height );
 483 }
 484
 485 void wxWindowDC::DrawEllipse( long x, long y, long width, long height )
 486 {
 487     wxCHECK_RET( Ok(), "invalid window dc" );
 488
 489     long xx = XLOG2DEV(x);
 490     long yy = YLOG2DEV(y);
 491     long ww = m_signX * XLOG2DEVREL(width);
 492     long hh = m_signY * YLOG2DEVREL(height);
 493
 494     // CMB: handle -ve width and/or height
 495     if (ww < 0) { ww = -ww; xx = xx - ww; }
 496     if (hh < 0) { hh = -hh; yy = yy - hh; }
 497
 498     if (m_brush.GetStyle() != wxTRANSPARENT)
 499         gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, 0, 360*64 );
 500
 501     if (m_pen.GetStyle() != wxTRANSPARENT)
 502         gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, ww, hh, 0, 360*64 );
 503
 504     CalcBoundingBox( x - width, y - height );
 505     CalcBoundingBox( x + width, y + height );
 506 }
 507
 508 bool wxWindowDC::CanDrawBitmap() const
 509 {
 510     return TRUE;
 511 }
 512
 513 void wxWindowDC::DrawIcon( const wxIcon &icon, long x, long y )
 514 {
 515     DrawBitmap( icon, x, y, TRUE );
 516 }
 517
 518 void wxWindowDC::DrawBitmap( const wxBitmap &bitmap, long x, long y, bool useMask )
 519 {
 520     wxCHECK_RET( Ok(), "invalid window dc" );
 521
 522     if (!bitmap.Ok()) return;
 523
 524     /* scale/translate size and position */
 525
 526     int xx = XLOG2DEV(x);
 527     int yy = YLOG2DEV(y);
 528
 529     int w = bitmap.GetWidth();
 530     int h = bitmap.GetHeight();
 531
 532     int ww = XLOG2DEVREL(w);
 533     int hh = YLOG2DEVREL(h);
 534
 535     /* scale bitmap if required */
 536
 537     wxBitmap use_bitmap;
 538
 539     if ((w != ww) || (h != hh))
 540     {
 541         wxImage image( bitmap );
 542         image = image.Scale( ww, hh );
 543
 544         use_bitmap = image.ConvertToBitmap();
 545     }
 546     else
 547     {
 548         use_bitmap = bitmap;
 549     }
 550
 551     /* apply mask if any */
 552
 553     GdkBitmap *mask = (GdkBitmap *) NULL;
 554     if (use_bitmap.GetMask()) mask = use_bitmap.GetMask()->GetBitmap();
 555
 556     if (useMask && mask)
 557     {
 558         gdk_gc_set_clip_mask( m_penGC, mask );
 559         gdk_gc_set_clip_origin( m_penGC, xx, yy );
 560     }
 561
 562     /* draw XPixmap or XBitmap, depending on what the wxBitmap contains */
 563
 564     GdkPixmap *pm = use_bitmap.GetPixmap();
 565     if (pm)
 566     {
 567         gdk_draw_pixmap( m_window, m_penGC, pm, 0, 0, xx, yy, -1, -1 );
 568     }
 569     else
 570     {
 571         GdkBitmap *bm = use_bitmap.GetBitmap();
 572         if (bm)
 573         {
 574             gdk_draw_bitmap( m_window, m_penGC, bm, 0, 0, xx, yy, -1, -1 );
 575         }
 576     }
 577
 578     /* remove mask again if any */
 579
 580     if (useMask && mask)
 581     {
 582         gdk_gc_set_clip_mask( m_penGC, (GdkBitmap *) NULL );
 583         gdk_gc_set_clip_origin( m_penGC, 0, 0 );
 584     }
 585
 586     CalcBoundingBox( x, y );
 587     CalcBoundingBox( x + w, y + h );
 588 }
 589
 590 bool wxWindowDC::Blit( long xdest, long ydest, long width, long height,
 591        wxDC *source, long xsrc, long ysrc, int logical_func, bool useMask )
 592 {
 593    /* this is the nth try to get this utterly useless function to
 594       work. it now completely ignores the scaling or translation
 595       of the source dc, but scales correctly on the target dc and
 596       knows about possible mask information in a memory dc. */
 597
 598     wxCHECK_MSG( Ok(), FALSE, "invalid window dc" );
 599
 600     wxCHECK_MSG( source, FALSE, "invalid source dc" );
 601
 602     wxClientDC *srcDC = (wxClientDC*)source;
 603     wxMemoryDC *memDC = (wxMemoryDC*)source;
 604
 605     bool use_bitmap_method = FALSE;
 606
 607     if (srcDC->m_isMemDC)
 608     {
 609         if (!memDC->m_selected.Ok()) return FALSE;
 610
 611         /* we use the "XCopyArea" way to copy a memory dc into
 612            y different window if the memory dc BOTH
 613            a) doesn't have any mask or its mask isn't used
 614            b) it is clipped.
 615            we HAVE TO use the direct way for memory dcs
 616            that have mask since the XCopyArea doesn't know
 617            about masks and we SHOULD use the direct way if
 618            all of the bitmap in the memory dc is copied in
 619            which case XCopyArea wouldn't be able able to
 620            boost performace by reducing the area to be scaled */
 621
 622         use_bitmap_method = ( (useMask && (memDC->m_selected.GetMask())) ||
 623                                ((xsrc == 0) && (ysrc == 0) &&
 624                                 (width == memDC->m_selected.GetWidth()) &&
 625                                 (height == memDC->m_selected.GetHeight()) )
 626                             );
 627     }
 628
 629     CalcBoundingBox( xdest, ydest );
 630     CalcBoundingBox( xdest + width, ydest + height );
 631
 632     int old_logical_func = m_logicalFunction;
 633     SetLogicalFunction( logical_func );
 634
 635     if (use_bitmap_method)
 636     {
 637         /* scale/translate bitmap size */
 638
 639         long bm_width = memDC->m_selected.GetWidth();
 640         long bm_height = memDC->m_selected.GetHeight();
 641
 642         long bm_ww = XLOG2DEVREL( bm_width );
 643         long bm_hh = YLOG2DEVREL( bm_height );
 644
 645         /* scale bitmap if required */
 646
 647         wxBitmap use_bitmap;
 648
 649         if ((bm_width != bm_ww) || (bm_height != bm_hh))
 650         {
 651             wxImage image( memDC->m_selected );
 652             image = image.Scale( bm_ww, bm_hh );
 653
 654             use_bitmap = image.ConvertToBitmap();
 655         }
 656         else
 657         {
 658             use_bitmap = memDC->m_selected;
 659         }
 660
 661         /* scale/translate size and position */
 662
 663         long xx = XLOG2DEV(xdest);
 664         long yy = YLOG2DEV(ydest);
 665
 666         long ww = XLOG2DEVREL(width);
 667         long hh = YLOG2DEVREL(height);
 668
 669         /* apply mask if any */
 670
 671         GdkBitmap *mask = (GdkBitmap *) NULL;
 672         if (use_bitmap.GetMask()) mask = use_bitmap.GetMask()->GetBitmap();
 673
 674         if (useMask && mask)
 675         {
 676             gdk_gc_set_clip_mask( m_penGC, mask );
 677             gdk_gc_set_clip_origin( m_penGC, xx, yy );
 678         }
 679
 680         /* draw XPixmap or XBitmap, depending on what the wxBitmap contains */
 681
 682         GdkPixmap *pm = use_bitmap.GetPixmap();
 683         if (pm)
 684         {
 685             gdk_draw_pixmap( m_window, m_penGC, pm, 0, 0, xx, yy, ww, hh );
 686         }
 687         else
 688         {
 689             GdkBitmap *bm = use_bitmap.GetBitmap();
 690             if (bm)
 691             {
 692                 gdk_draw_bitmap( m_window, m_penGC, bm, 0, 0, xx, yy, ww, hh );
 693             }
 694         }
 695
 696         /* remove mask again if any */
 697
 698         if (useMask && mask)
 699         {
 700             gdk_gc_set_clip_mask( m_penGC, (GdkBitmap *) NULL );
 701             gdk_gc_set_clip_origin( m_penGC, 0, 0 );
 702         }
 703     }
 704     else /* use_bitmap_method */
 705     {
 706         /* scale/translate size and position */
 707
 708         long xx = XLOG2DEV(xdest);
 709         long yy = YLOG2DEV(ydest);
 710
 711         long ww = XLOG2DEVREL(width);
 712         long hh = YLOG2DEVREL(height);
 713
 714         if ((width != ww) || (height != hh))
 715         {
 716             /* draw source window into a bitmap as we cannot scale
 717                a window in contrast to a bitmap. this would actually
 718                work with memory dcs as well, but we'd lose the mask
 719                information and waste one step in this process since
 720                a memory already has a bitmap. all this is slightly
 721                inefficient as we could take an XImage directly from
 722                an X window, but we'd then also have to care that
 723                the window is not outside the screen (in which case
 724                we'd get a BadMatch or what not).
 725                Is a double XGetImage and combined XGetPixel and
 726                XPutPixel really faster? I'm not sure. look at wxXt
 727                for a different implementation of the same problem. */
 728
 729             wxBitmap bitmap( width, height );
 730             gdk_window_copy_area( bitmap.GetPixmap(), m_penGC, 0, 0,
 731                                   srcDC->GetWindow(),
 732                                   xsrc, ysrc, width, height );
 733
 734             /* scale image */
 735
 736             wxImage image( bitmap );
 737             image = image.Scale( ww, hh );
 738
 739             /* convert to bitmap */
 740
 741             bitmap = image.ConvertToBitmap();
 742
 743             /* draw scaled bitmap */
 744
 745             gdk_draw_pixmap( m_window, m_penGC, bitmap.GetPixmap(), 0, 0, xx, yy, -1, -1 );
 746
 747         }
 748         else
 749         {
 750             /* no scaling and not a memory dc with a mask either */
 751
 752             gdk_window_copy_area( m_window, m_penGC, xx, yy,
 753                                   srcDC->GetWindow(),
 754                                   xsrc, ysrc, width, height );
 755         }
 756     }
 757
 758     SetLogicalFunction( old_logical_func );
 759     return TRUE;
 760 }
 761
 762 void wxWindowDC::DrawText( const wxString &text, long x, long y, bool WXUNUSED(use16) )
 763 {
 764     wxCHECK_RET( Ok(), "invalid window dc" );
 765
 766     GdkFont *font = m_font.GetInternalFont( m_scaleY );
 767
 768     x = XLOG2DEV(x);
 769     y = YLOG2DEV(y);
 770
 771     /* CMB 21/5/98: draw text background if mode is wxSOLID */
 772     if (m_backgroundMode == wxSOLID)
 773     {
 774         long width = gdk_string_width( font, text );
 775         long height = font->ascent + font->descent;
 776         gdk_gc_set_foreground( m_textGC, m_textBackgroundColour.GetColor() );
 777         gdk_draw_rectangle( m_window, m_textGC, TRUE, x, y, width, height );
 778         gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );
 779     }
 780     gdk_draw_string( m_window, font, m_textGC, x, y + font->ascent, text );
 781
 782     /* CMB 17/7/98: simple underline: ignores scaling and underlying
 783        X font's XA_UNDERLINE_POSITION and XA_UNDERLINE_THICKNESS
 784        properties (see wxXt implementation) */
 785     if (m_font.GetUnderlined())
 786     {
 787         long width = gdk_string_width( font, text );
 788         long ul_y = y + font->ascent;
 789         if (font->descent > 0) ul_y++;
 790         gdk_draw_line( m_window, m_textGC, x, ul_y, x + width, ul_y);
 791     }
 792
 793     long w, h;
 794     GetTextExtent (text, &w, &h);
 795     CalcBoundingBox (x + w, y + h);
 796     CalcBoundingBox (x, y);
 797 }
 798
 799 bool wxWindowDC::CanGetTextExtent() const
 800 {
 801     return TRUE;
 802 }
 803
 804 void wxWindowDC::GetTextExtent( const wxString &string, long *width, long *height,
 805                      long *descent, long *externalLeading,
 806                      wxFont *theFont, bool WXUNUSED(use16) )
 807 {
 808     wxCHECK_RET( Ok(), "invalid window dc" );
 809
 810     wxFont fontToUse = m_font;
 811     if (theFont) fontToUse = *theFont;
 812
 813     GdkFont *font = fontToUse.GetInternalFont( m_scaleY );
 814     if (width) (*width) = long(gdk_string_width( font, string ) / m_scaleX);
 815     if (height) (*height) = long((font->ascent + font->descent) / m_scaleY);
 816     if (descent) (*descent) = long(font->descent / m_scaleY);
 817     if (externalLeading) (*externalLeading) = 0;  // ??
 818 }
 819
 820 long wxWindowDC::GetCharWidth()
 821 {
 822     wxCHECK_MSG( Ok(), 0, "invalid window dc" );
 823
 824     GdkFont *font = m_font.GetInternalFont( m_scaleY );
 825     return long(gdk_string_width( font, "H" ) / m_scaleX);
 826 }
 827
 828 long wxWindowDC::GetCharHeight()
 829 {
 830     wxCHECK_MSG( Ok(), 0, "invalid window dc" );
 831
 832     GdkFont *font = m_font.GetInternalFont( m_scaleY );
 833     return long((font->ascent + font->descent) / m_scaleY);
 834 }
 835
 836 void wxWindowDC::Clear()
 837 {
 838     wxCHECK_RET( Ok(), "invalid window dc" );
 839
 840     if (!m_isMemDC)
 841     {
 842         gdk_window_clear( m_window );
 843     }
 844     else
 845     {
 846         int width,height;
 847         GetSize( &width, &height );
 848         gdk_draw_rectangle( m_window, m_bgGC, TRUE, 0, 0, width, height );
 849     }
 850 }
 851
 852 void wxWindowDC::SetFont( const wxFont &font )
 853 {
 854     wxCHECK_RET( Ok(), "invalid window dc" );
 855
 856     m_font = font;
 857 }
 858
 859 void wxWindowDC::SetPen( const wxPen &pen )
 860 {
 861     wxCHECK_RET( Ok(), "invalid window dc" );
 862
 863     if (m_pen == pen) return;
 864
 865     m_pen = pen;
 866
 867     if (!m_pen.Ok()) return;
 868
 869     gint width = m_pen.GetWidth();
 870     // CMB: if width is non-zero scale it with the dc
 871     if (width <= 0)
 872     {
 873         width = 1;
 874     }
 875     else
 876     {
 877         // X doesn't allow different width in x and y and so we take
 878         // the average
 879         double w = 0.5 + (abs(XLOG2DEVREL(width)) + abs(YLOG2DEVREL(width))) / 2.0;
 880         width = (int)w;
 881     }
 882
 883     GdkLineStyle lineStyle = GDK_LINE_SOLID;
 884     switch (m_pen.GetStyle())
 885     {
 886         case wxSOLID:      { lineStyle = GDK_LINE_SOLID;       break; }
 887         case wxDOT:        { lineStyle = GDK_LINE_ON_OFF_DASH; break; }
 888         case wxLONG_DASH:  { lineStyle = GDK_LINE_ON_OFF_DASH; break; }
 889         case wxSHORT_DASH: { lineStyle = GDK_LINE_ON_OFF_DASH; break; }
 890         case wxDOT_DASH:   { lineStyle = GDK_LINE_DOUBLE_DASH; break; }
 891     }
 892
 893     GdkCapStyle capStyle = GDK_CAP_ROUND;
 894     switch (m_pen.GetCap())
 895     {
 896         case wxCAP_ROUND:      { capStyle = (width <= 1) ? GDK_CAP_NOT_LAST : GDK_CAP_ROUND; break; }
 897         case wxCAP_PROJECTING: { capStyle = GDK_CAP_PROJECTING; break; }
 898         case wxCAP_BUTT:       { capStyle = GDK_CAP_BUTT;       break; }
 899     }
 900
 901     GdkJoinStyle joinStyle = GDK_JOIN_ROUND;
 902     switch (m_pen.GetJoin())
 903     {
 904         case wxJOIN_BEVEL: { joinStyle = GDK_JOIN_BEVEL; break; }
 905         case wxJOIN_ROUND: { joinStyle = GDK_JOIN_ROUND; break; }
 906         case wxJOIN_MITER: { joinStyle = GDK_JOIN_MITER; break; }
 907     }
 908
 909     gdk_gc_set_line_attributes( m_penGC, width, lineStyle, capStyle, joinStyle );
 910
 911     m_pen.GetColour().CalcPixel( m_cmap );
 912     gdk_gc_set_foreground( m_penGC, m_pen.GetColour().GetColor() );
 913 }
 914
 915 void wxWindowDC::SetBrush( const wxBrush &brush )
 916 {
 917     wxCHECK_RET( Ok(), "invalid window dc" );
 918
 919     if (m_brush == brush) return;
 920
 921     m_brush = brush;
 922
 923     if (!m_brush.Ok()) return;
 924
 925     m_brush.GetColour().CalcPixel( m_cmap );
 926     gdk_gc_set_foreground( m_brushGC, m_brush.GetColour().GetColor() );
 927
 928     GdkFill fillStyle = GDK_SOLID;
 929     switch (m_brush.GetStyle())
 930     {
 931       case wxSOLID:
 932       case wxTRANSPARENT:
 933          break;
 934       default:
 935          fillStyle = GDK_STIPPLED;
 936     }
 937
 938     gdk_gc_set_fill( m_brushGC, fillStyle );
 939
 940     if (m_brush.GetStyle() == wxSTIPPLE)
 941     {
 942         gdk_gc_set_stipple( m_brushGC, m_brush.GetStipple()->GetPixmap() );
 943     }
 944
 945     if (IS_HATCH(m_brush.GetStyle()))
 946     {
 947         int num = m_brush.GetStyle() - wxBDIAGONAL_HATCH;
 948         gdk_gc_set_stipple( m_brushGC, hatches[num] );
 949     }
 950 }
 951
 952 void wxWindowDC::SetBackground( const wxBrush &brush )
 953 {
 954    /* CMB 21/7/98: Added SetBackground. Sets background brush
 955     * for Clear() and bg colour for shapes filled with cross-hatch brush */
 956
 957     wxCHECK_RET( Ok(), "invalid window dc" );
 958
 959     if (m_backgroundBrush == brush) return;
 960
 961     m_backgroundBrush = brush;
 962
 963     if (!m_backgroundBrush.Ok()) return;
 964
 965     if (m_owner)
 966     {
 967         m_owner->SetBackgroundColour( m_backgroundBrush.GetColour() );
 968     }
 969
 970     m_backgroundBrush.GetColour().CalcPixel( m_cmap );
 971     gdk_gc_set_background( m_brushGC, m_backgroundBrush.GetColour().GetColor() );
 972     gdk_gc_set_background( m_penGC, m_backgroundBrush.GetColour().GetColor() );
 973     gdk_gc_set_background( m_bgGC, m_backgroundBrush.GetColour().GetColor() );
 974     gdk_gc_set_foreground( m_bgGC, m_backgroundBrush.GetColour().GetColor() );
 975
 976     GdkFill fillStyle = GDK_SOLID;
 977     switch (m_backgroundBrush.GetStyle())
 978     {
 979         case wxSOLID:
 980         case wxTRANSPARENT:
 981             break;
 982         default:
 983             fillStyle = GDK_STIPPLED;
 984     }
 985
 986     gdk_gc_set_fill( m_bgGC, fillStyle );
 987
 988     if (m_backgroundBrush.GetStyle() == wxSTIPPLE)
 989     {
 990         gdk_gc_set_stipple( m_bgGC, m_backgroundBrush.GetStipple()->GetPixmap() );
 991     }
 992
 993     if (IS_HATCH(m_backgroundBrush.GetStyle()))
 994     {
 995         int num = m_backgroundBrush.GetStyle() - wxBDIAGONAL_HATCH;
 996         gdk_gc_set_stipple( m_bgGC, hatches[num] );
 997     }
 998 }
 999
1000 void wxWindowDC::SetLogicalFunction( int function )
1001 {
1002     wxCHECK_RET( Ok(), "invalid window dc" );
1003
1004     if (m_logicalFunction == function) return;
1005
1006     GdkFunction mode = GDK_COPY;
1007     switch (function)
1008     {
1009         case wxXOR:    mode = GDK_INVERT; break;
1010         case wxINVERT: mode = GDK_INVERT; break;
1011         default:       break;
1012     }
1013
1014     m_logicalFunction = function;
1015     gdk_gc_set_function( m_penGC, mode );
1016     gdk_gc_set_function( m_brushGC, mode );
1017     gdk_gc_set_function( m_textGC, mode );
1018 }
1019
1020 void wxWindowDC::SetTextForeground( const wxColour &col )
1021 {
1022     wxCHECK_RET( Ok(), "invalid window dc" );
1023
1024     if (m_textForegroundColour == col) return;
1025
1026     m_textForegroundColour = col;
1027     if (!m_textForegroundColour.Ok()) return;
1028
1029     m_textForegroundColour.CalcPixel( m_cmap );
1030     gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );
1031 }
1032
1033 void wxWindowDC::SetTextBackground( const wxColour &col )
1034 {
1035     wxCHECK_RET( Ok(), "invalid window dc" );
1036
1037     if (m_textBackgroundColour == col) return;
1038
1039     m_textBackgroundColour = col;
1040     if (!m_textBackgroundColour.Ok()) return;
1041
1042     m_textBackgroundColour.CalcPixel( m_cmap );
1043     gdk_gc_set_background( m_textGC, m_textBackgroundColour.GetColor() );
1044 }
1045
1046 void wxWindowDC::SetBackgroundMode( int mode )
1047 {
1048     wxCHECK_RET( Ok(), "invalid window dc" );
1049
1050     m_backgroundMode = mode;
1051
1052     // CMB 21/7/98: fill style of cross-hatch brushes is affected by
1053     // transparent/solid background mode
1054
1055     if (m_brush.GetStyle() != wxSOLID && m_brush.GetStyle() != wxTRANSPARENT)
1056     {
1057         gdk_gc_set_fill( m_brushGC,
1058           (m_backgroundMode == wxTRANSPARENT) ? GDK_STIPPLED : GDK_OPAQUE_STIPPLED);
1059     }
1060 }
1061
1062 void wxWindowDC::SetPalette( const wxPalette& WXUNUSED(palette) )
1063 {
1064     wxFAIL_MSG( "wxWindowDC::SetPalette not implemented" );
1065 }
1066
1067 void wxWindowDC::SetClippingRegion( long x, long y, long width, long height )
1068 {
1069     wxCHECK_RET( Ok(), "invalid window dc" );
1070
1071     wxDC::SetClippingRegion( x, y, width, height );
1072
1073     GdkRectangle rect;
1074     rect.x = XLOG2DEV(x);
1075     rect.y = YLOG2DEV(y);
1076     rect.width = XLOG2DEVREL(width);
1077     rect.height = YLOG2DEVREL(height);
1078     gdk_gc_set_clip_rectangle( m_penGC, &rect );
1079     gdk_gc_set_clip_rectangle( m_brushGC, &rect );
1080     gdk_gc_set_clip_rectangle( m_textGC, &rect );
1081     gdk_gc_set_clip_rectangle( m_bgGC, &rect );
1082 }
1083
1084 void wxWindowDC::SetClippingRegion( const wxRegion &region  )
1085 {
1086     wxCHECK_RET( Ok(), "invalid window dc" );
1087
1088     if (region.Empty())
1089     {
1090         DestroyClippingRegion();
1091         return;
1092     }
1093
1094     gdk_gc_set_clip_region( m_penGC, region.GetRegion() );
1095     gdk_gc_set_clip_region( m_brushGC, region.GetRegion() );
1096     gdk_gc_set_clip_region( m_textGC, region.GetRegion() );
1097     gdk_gc_set_clip_region( m_bgGC, region.GetRegion() );
1098 }
1099
1100 void wxWindowDC::DestroyClippingRegion()
1101 {
1102     wxCHECK_RET( Ok(), "invalid window dc" );
1103
1104     wxDC::DestroyClippingRegion();
1105
1106     gdk_gc_set_clip_rectangle( m_penGC, (GdkRectangle *) NULL );
1107     gdk_gc_set_clip_rectangle( m_brushGC, (GdkRectangle *) NULL );
1108     gdk_gc_set_clip_rectangle( m_textGC, (GdkRectangle *) NULL );
1109     gdk_gc_set_clip_rectangle( m_bgGC, (GdkRectangle *) NULL );
1110 }
1111
1112 void wxWindowDC::SetUpDC()
1113 {
1114     Destroy();
1115     m_ok = TRUE;
1116     m_logicalFunction = wxCOPY;
1117     m_penGC = gdk_gc_new( m_window );
1118     m_brushGC = gdk_gc_new( m_window );
1119     m_textGC = gdk_gc_new( m_window );
1120     m_bgGC = gdk_gc_new( m_window );
1121
1122     wxColour tmp_col( m_textForegroundColour );
1123     m_textForegroundColour = wxNullColour;
1124     SetTextForeground( tmp_col );
1125     tmp_col = m_textBackgroundColour;
1126     m_textBackgroundColour = wxNullColour;
1127     SetTextBackground( tmp_col );
1128
1129     wxPen tmp_pen( m_pen );
1130     m_pen = wxNullPen;
1131     SetPen( tmp_pen );
1132
1133     wxFont tmp_font( m_font );
1134     m_font = wxNullFont;
1135     SetFont( tmp_font );
1136
1137     wxBrush tmp_brush( m_brush );
1138     m_brush = wxNullBrush;
1139     SetBrush( tmp_brush );
1140
1141     tmp_brush = m_backgroundBrush;
1142     m_backgroundBrush = wxNullBrush;
1143     SetBackground( tmp_brush );
1144
1145     if (!hatch_bitmap)
1146     {
1147         hatch_bitmap    = hatches;
1148         hatch_bitmap[0] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, bdiag_bits, bdiag_width, bdiag_height );
1149         hatch_bitmap[1] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, cdiag_bits, cdiag_width, cdiag_height );
1150         hatch_bitmap[2] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, fdiag_bits, fdiag_width, fdiag_height );
1151         hatch_bitmap[3] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, cross_bits, cross_width, cross_height );
1152         hatch_bitmap[4] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, horiz_bits, horiz_width, horiz_height );
1153         hatch_bitmap[5] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, verti_bits, verti_width, verti_height );
1154     }
1155 }
1156
1157 void wxWindowDC::Destroy()
1158 {
1159     if (m_penGC) gdk_gc_unref( m_penGC );
1160     m_penGC = (GdkGC*) NULL;
1161     if (m_brushGC) gdk_gc_unref( m_brushGC );
1162     m_brushGC = (GdkGC*) NULL;
1163     if (m_textGC) gdk_gc_unref( m_textGC );
1164     m_textGC = (GdkGC*) NULL;
1165     if (m_bgGC) gdk_gc_unref( m_bgGC );
1166     m_bgGC = (GdkGC*) NULL;
1167 }
1168
1169 GdkWindow *wxWindowDC::GetWindow()
1170 {
1171     return m_window;
1172 }
1173
1174 // ----------------------------------- spline code ----------------------------------------
1175
1176 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
1177                          double a3, double b3, double a4, double b4);
1178 void wx_clear_stack();
1179 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
1180         double *y3, double *x4, double *y4);
1181 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
1182           double x4, double y4);
1183 static bool wx_spline_add_point(double x, double y);
1184 static void wx_spline_draw_point_array(wxDC *dc);
1185
1186 wxList wx_spline_point_list;
1187
1188 #define         half(z1, z2)    ((z1+z2)/2.0)
1189 #define         THRESHOLD       5
1190
1191 /* iterative version */
1192
1193 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
1194                  double b4)
1195 {
1196     register double  xmid, ymid;
1197     double           x1, y1, x2, y2, x3, y3, x4, y4;
1198
1199     wx_clear_stack();
1200     wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
1201
1202     while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
1203         xmid = (double)half(x2, x3);
1204         ymid = (double)half(y2, y3);
1205         if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
1206             fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
1207             wx_spline_add_point( x1, y1 );
1208             wx_spline_add_point( xmid, ymid );
1209         } else {
1210             wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
1211                  (double)half(x3, x4), (double)half(y3, y4), x4, y4);
1212             wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
1213                  (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
1214         }
1215     }
1216 }
1217
1218 /* utilities used by spline drawing routines */
1219
1220 typedef struct wx_spline_stack_struct {
1221     double           x1, y1, x2, y2, x3, y3, x4, y4;
1222 } Stack;
1223
1224 #define         SPLINE_STACK_DEPTH             20
1225 static Stack    wx_spline_stack[SPLINE_STACK_DEPTH];
1226 static Stack   *wx_stack_top;
1227 static int      wx_stack_count;
1228
1229 void wx_clear_stack()
1230 {
1231     wx_stack_top = wx_spline_stack;
1232     wx_stack_count = 0;
1233 }
1234
1235 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
1236 {
1237     wx_stack_top->x1 = x1;
1238     wx_stack_top->y1 = y1;
1239     wx_stack_top->x2 = x2;
1240     wx_stack_top->y2 = y2;
1241     wx_stack_top->x3 = x3;
1242     wx_stack_top->y3 = y3;
1243     wx_stack_top->x4 = x4;
1244     wx_stack_top->y4 = y4;
1245     wx_stack_top++;
1246     wx_stack_count++;
1247 }
1248
1249 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
1250                   double *x3, double *y3, double *x4, double *y4)
1251 {
1252     if (wx_stack_count == 0)
1253         return (0);
1254     wx_stack_top--;
1255     wx_stack_count--;
1256     *x1 = wx_stack_top->x1;
1257     *y1 = wx_stack_top->y1;
1258     *x2 = wx_stack_top->x2;
1259     *y2 = wx_stack_top->y2;
1260     *x3 = wx_stack_top->x3;
1261     *y3 = wx_stack_top->y3;
1262     *x4 = wx_stack_top->x4;
1263     *y4 = wx_stack_top->y4;
1264     return (1);
1265 }
1266
1267 static bool wx_spline_add_point(double x, double y)
1268 {
1269   wxPoint *point = new wxPoint ;
1270   point->x = (int) x;
1271   point->y = (int) y;
1272   wx_spline_point_list.Append((wxObject*)point);
1273   return TRUE;
1274 }
1275
1276 static void wx_spline_draw_point_array(wxDC *dc)
1277 {
1278   dc->DrawLines(&wx_spline_point_list, 0, 0 );
1279   wxNode *node = wx_spline_point_list.First();
1280   while (node)
1281   {
1282     wxPoint *point = (wxPoint *)node->Data();
1283     delete point;
1284     delete node;
1285     node = wx_spline_point_list.First();
1286   }
1287 }
1288
1289 void wxWindowDC::DrawSpline( wxList *points )
1290 {
1291     wxCHECK_RET( Ok(), "invalid window dc" );
1292
1293     wxPoint *p;
1294     double           cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
1295     double           x1, y1, x2, y2;
1296
1297     wxNode *node = points->First();
1298     p = (wxPoint *)node->Data();
1299
1300     x1 = p->x;
1301     y1 = p->y;
1302
1303     node = node->Next();
1304     p = (wxPoint *)node->Data();
1305
1306     x2 = p->x;
1307     y2 = p->y;
1308     cx1 = (double)((x1 + x2) / 2);
1309     cy1 = (double)((y1 + y2) / 2);
1310     cx2 = (double)((cx1 + x2) / 2);
1311     cy2 = (double)((cy1 + y2) / 2);
1312
1313     wx_spline_add_point(x1, y1);
1314
1315     while ((node = node->Next()) != NULL)
1316     {
1317         p = (wxPoint *)node->Data();
1318         x1 = x2;
1319         y1 = y2;
1320         x2 = p->x;
1321         y2 = p->y;
1322         cx4 = (double)(x1 + x2) / 2;
1323         cy4 = (double)(y1 + y2) / 2;
1324         cx3 = (double)(x1 + cx4) / 2;
1325         cy3 = (double)(y1 + cy4) / 2;
1326
1327         wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
1328
1329         cx1 = cx4;
1330         cy1 = cy4;
1331         cx2 = (double)(cx1 + x2) / 2;
1332         cy2 = (double)(cy1 + y2) / 2;
1333     }
1334
1335     wx_spline_add_point( cx1, cy1 );
1336     wx_spline_add_point( x2, y2 );
1337
1338     wx_spline_draw_point_array( this );
1339 }
1340
1341
1342 //-----------------------------------------------------------------------------
1343 // wxPaintDC
1344 //-----------------------------------------------------------------------------
1345
1346 IMPLEMENT_DYNAMIC_CLASS(wxPaintDC,wxWindowDC)
1347
1348 wxPaintDC::wxPaintDC()
1349   : wxWindowDC()
1350 {
1351 }
1352
1353 wxPaintDC::wxPaintDC( wxWindow *win )
1354   : wxWindowDC( win )
1355 {
1356 }
1357
1358 //-----------------------------------------------------------------------------
1359 // wxClientDC
1360 //-----------------------------------------------------------------------------
1361
1362 IMPLEMENT_DYNAMIC_CLASS(wxClientDC,wxWindowDC)
1363
1364 wxClientDC::wxClientDC()
1365   : wxWindowDC()
1366 {
1367 }
1368
1369 wxClientDC::wxClientDC( wxWindow *win )
1370   : wxWindowDC( win )
1371 {
1372 }
1373