src/gtk1/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            c) is not 1-bit */
 616
 617         if (useMask && (memDC->m_selected.GetMask()))
 618         {
 619            /* we HAVE TO use the direct way for memory dcs
 620               that have mask since the XCopyArea doesn't know
 621               about masks and */
 622             use_bitmap_method = TRUE;
 623         }
 624         else if (memDC->m_selected.GetDepth() == 1)
 625         {
 626            /* we HAVE TO use the direct way for memory dcs
 627               that are bitmaps because XCopyArea doesn't copy
 628               with different bit depths */
 629             use_bitmap_method = TRUE;
 630         }
 631         else if ((xsrc == 0) && (ysrc == 0) &&
 632                  (width == memDC->m_selected.GetWidth()) &&
 633                  (height == memDC->m_selected.GetHeight()))
 634         {
 635            /* we SHOULD use the direct way if all of the bitmap
 636               in the memory dc is copied in which case XCopyArea
 637               wouldn't be able able to boost performace by reducing
 638               the area to be scaled */
 639             use_bitmap_method = TRUE;
 640         }
 641         else
 642         {
 643             use_bitmap_method = FALSE;
 644         }
 645     }
 646
 647     CalcBoundingBox( xdest, ydest );
 648     CalcBoundingBox( xdest + width, ydest + height );
 649
 650     int old_logical_func = m_logicalFunction;
 651     SetLogicalFunction( logical_func );
 652
 653     if (use_bitmap_method)
 654     {
 655         /* scale/translate bitmap size */
 656
 657         long bm_width = memDC->m_selected.GetWidth();
 658         long bm_height = memDC->m_selected.GetHeight();
 659
 660         long bm_ww = XLOG2DEVREL( bm_width );
 661         long bm_hh = YLOG2DEVREL( bm_height );
 662
 663         /* scale bitmap if required */
 664
 665         wxBitmap use_bitmap;
 666
 667         if ((bm_width != bm_ww) || (bm_height != bm_hh))
 668         {
 669             printf( "scaling.\n" );
 670
 671             wxImage image( memDC->m_selected );
 672             image = image.Scale( bm_ww, bm_hh );
 673
 674             use_bitmap = image.ConvertToBitmap();
 675         }
 676         else
 677         {
 678             use_bitmap = memDC->m_selected;
 679         }
 680
 681         /* scale/translate size and position */
 682
 683         long xx = XLOG2DEV(xdest);
 684         long yy = YLOG2DEV(ydest);
 685
 686         long ww = XLOG2DEVREL(width);
 687         long hh = YLOG2DEVREL(height);
 688
 689         /* apply mask if any */
 690
 691         GdkBitmap *mask = (GdkBitmap *) NULL;
 692         if (use_bitmap.GetMask()) mask = use_bitmap.GetMask()->GetBitmap();
 693
 694         if (useMask && mask)
 695         {
 696             gdk_gc_set_clip_mask( m_penGC, mask );
 697             gdk_gc_set_clip_origin( m_penGC, xx, yy );
 698         }
 699
 700         /* draw XPixmap or XBitmap, depending on what the wxBitmap contains */
 701
 702         GdkPixmap *pm = use_bitmap.GetPixmap();
 703         if (pm)
 704         {
 705             gdk_draw_pixmap( m_window, m_penGC, pm, xsrc, ysrc, xx, yy, ww, hh );
 706         }
 707         else
 708         {
 709             GdkBitmap *bm = use_bitmap.GetBitmap();
 710             if (bm)
 711             {
 712                 /* we use the textGC here because blitting a bitmap is done
 713                    using the current text colour */
 714                 gdk_draw_bitmap( m_window, m_textGC, bm, xsrc, ysrc, xx, yy, ww, hh );
 715             }
 716         }
 717
 718         /* remove mask again if any */
 719
 720         if (useMask && mask)
 721         {
 722             gdk_gc_set_clip_mask( m_penGC, (GdkBitmap *) NULL );
 723             gdk_gc_set_clip_origin( m_penGC, 0, 0 );
 724         }
 725     }
 726     else /* use_bitmap_method */
 727     {
 728         /* scale/translate size and position */
 729
 730         long xx = XLOG2DEV(xdest);
 731         long yy = YLOG2DEV(ydest);
 732
 733         long ww = XLOG2DEVREL(width);
 734         long hh = YLOG2DEVREL(height);
 735
 736         if ((width != ww) || (height != hh))
 737         {
 738             /* draw source window into a bitmap as we cannot scale
 739                a window in contrast to a bitmap. this would actually
 740                work with memory dcs as well, but we'd lose the mask
 741                information and waste one step in this process since
 742                a memory already has a bitmap. all this is slightly
 743                inefficient as we could take an XImage directly from
 744                an X window, but we'd then also have to care that
 745                the window is not outside the screen (in which case
 746                we'd get a BadMatch or what not).
 747                Is a double XGetImage and combined XGetPixel and
 748                XPutPixel really faster? I'm not sure. look at wxXt
 749                for a different implementation of the same problem. */
 750
 751             wxBitmap bitmap( width, height );
 752             gdk_window_copy_area( bitmap.GetPixmap(), m_penGC, 0, 0,
 753                                   srcDC->GetWindow(),
 754                                   xsrc, ysrc, width, height );
 755
 756             /* scale image */
 757
 758             wxImage image( bitmap );
 759             image = image.Scale( ww, hh );
 760
 761             /* convert to bitmap */
 762
 763             bitmap = image.ConvertToBitmap();
 764
 765             /* draw scaled bitmap */
 766
 767             gdk_draw_pixmap( m_window, m_penGC, bitmap.GetPixmap(), 0, 0, xx, yy, -1, -1 );
 768
 769         }
 770         else
 771         {
 772             /* no scaling and not a memory dc with a mask either */
 773
 774             gdk_window_copy_area( m_window, m_penGC, xx, yy,
 775                                   srcDC->GetWindow(),
 776                                   xsrc, ysrc, width, height );
 777         }
 778     }
 779
 780     SetLogicalFunction( old_logical_func );
 781     return TRUE;
 782 }
 783
 784 void wxWindowDC::DrawText( const wxString &text, long x, long y, bool WXUNUSED(use16) )
 785 {
 786     wxCHECK_RET( Ok(), "invalid window dc" );
 787
 788     GdkFont *font = m_font.GetInternalFont( m_scaleY );
 789
 790     x = XLOG2DEV(x);
 791     y = YLOG2DEV(y);
 792
 793     /* CMB 21/5/98: draw text background if mode is wxSOLID */
 794     if (m_backgroundMode == wxSOLID)
 795     {
 796         long width = gdk_string_width( font, text );
 797         long height = font->ascent + font->descent;
 798         gdk_gc_set_foreground( m_textGC, m_textBackgroundColour.GetColor() );
 799         gdk_draw_rectangle( m_window, m_textGC, TRUE, x, y, width, height );
 800         gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );
 801     }
 802     gdk_draw_string( m_window, font, m_textGC, x, y + font->ascent, text );
 803
 804     /* CMB 17/7/98: simple underline: ignores scaling and underlying
 805        X font's XA_UNDERLINE_POSITION and XA_UNDERLINE_THICKNESS
 806        properties (see wxXt implementation) */
 807     if (m_font.GetUnderlined())
 808     {
 809         long width = gdk_string_width( font, text );
 810         long ul_y = y + font->ascent;
 811         if (font->descent > 0) ul_y++;
 812         gdk_draw_line( m_window, m_textGC, x, ul_y, x + width, ul_y);
 813     }
 814
 815     long w, h;
 816     GetTextExtent (text, &w, &h);
 817     CalcBoundingBox (x + w, y + h);
 818     CalcBoundingBox (x, y);
 819 }
 820
 821 bool wxWindowDC::CanGetTextExtent() const
 822 {
 823     return TRUE;
 824 }
 825
 826 void wxWindowDC::GetTextExtent( const wxString &string, long *width, long *height,
 827                      long *descent, long *externalLeading,
 828                      wxFont *theFont, bool WXUNUSED(use16) )
 829 {
 830     wxCHECK_RET( Ok(), "invalid window dc" );
 831
 832     wxFont fontToUse = m_font;
 833     if (theFont) fontToUse = *theFont;
 834
 835     GdkFont *font = fontToUse.GetInternalFont( m_scaleY );
 836     if (width) (*width) = long(gdk_string_width( font, string ) / m_scaleX);
 837     if (height) (*height) = long((font->ascent + font->descent) / m_scaleY);
 838     if (descent) (*descent) = long(font->descent / m_scaleY);
 839     if (externalLeading) (*externalLeading) = 0;  // ??
 840 }
 841
 842 long wxWindowDC::GetCharWidth()
 843 {
 844     wxCHECK_MSG( Ok(), 0, "invalid window dc" );
 845
 846     GdkFont *font = m_font.GetInternalFont( m_scaleY );
 847     return long(gdk_string_width( font, "H" ) / m_scaleX);
 848 }
 849
 850 long wxWindowDC::GetCharHeight()
 851 {
 852     wxCHECK_MSG( Ok(), 0, "invalid window dc" );
 853
 854     GdkFont *font = m_font.GetInternalFont( m_scaleY );
 855     return long((font->ascent + font->descent) / m_scaleY);
 856 }
 857
 858 void wxWindowDC::Clear()
 859 {
 860     wxCHECK_RET( Ok(), "invalid window dc" );
 861
 862     /* - we either are a memory dc or have a window as the
 863        owner. anything else shouldn't happen.
 864        - we don't use gdk_window_clear() as we don't set
 865        the window's background colour anymore. it is too
 866        much pain to keep the DC's and the window's back-
 867        ground colour in synch. */
 868
 869     if (m_owner)
 870     {
 871         int width,height;
 872         m_owner->GetSize( &width, &height );
 873         gdk_draw_rectangle( m_window, m_bgGC, TRUE, 0, 0, width, height );
 874         return;
 875     }
 876
 877     if (m_isMemDC)
 878     {
 879         int width,height;
 880         GetSize( &width, &height );
 881         gdk_draw_rectangle( m_window, m_bgGC, TRUE, 0, 0, width, height );
 882         return;
 883     }
 884 }
 885
 886 void wxWindowDC::SetFont( const wxFont &font )
 887 {
 888     wxCHECK_RET( Ok(), "invalid window dc" );
 889
 890     m_font = font;
 891 }
 892
 893 void wxWindowDC::SetPen( const wxPen &pen )
 894 {
 895     wxCHECK_RET( Ok(), "invalid window dc" );
 896
 897     if (m_pen == pen) return;
 898
 899     m_pen = pen;
 900
 901     if (!m_pen.Ok()) return;
 902
 903     gint width = m_pen.GetWidth();
 904     // CMB: if width is non-zero scale it with the dc
 905     if (width <= 0)
 906     {
 907         width = 1;
 908     }
 909     else
 910     {
 911         // X doesn't allow different width in x and y and so we take
 912         // the average
 913         double w = 0.5 + (abs(XLOG2DEVREL(width)) + abs(YLOG2DEVREL(width))) / 2.0;
 914         width = (int)w;
 915     }
 916
 917     GdkLineStyle lineStyle = GDK_LINE_SOLID;
 918     switch (m_pen.GetStyle())
 919     {
 920         case wxSOLID:      { lineStyle = GDK_LINE_SOLID;       break; }
 921         case wxDOT:        { lineStyle = GDK_LINE_ON_OFF_DASH; break; }
 922         case wxLONG_DASH:  { lineStyle = GDK_LINE_ON_OFF_DASH; break; }
 923         case wxSHORT_DASH: { lineStyle = GDK_LINE_ON_OFF_DASH; break; }
 924         case wxDOT_DASH:   { lineStyle = GDK_LINE_DOUBLE_DASH; break; }
 925     }
 926
 927     GdkCapStyle capStyle = GDK_CAP_ROUND;
 928     switch (m_pen.GetCap())
 929     {
 930         case wxCAP_ROUND:      { capStyle = (width <= 1) ? GDK_CAP_NOT_LAST : GDK_CAP_ROUND; break; }
 931         case wxCAP_PROJECTING: { capStyle = GDK_CAP_PROJECTING; break; }
 932         case wxCAP_BUTT:       { capStyle = GDK_CAP_BUTT;       break; }
 933     }
 934
 935     GdkJoinStyle joinStyle = GDK_JOIN_ROUND;
 936     switch (m_pen.GetJoin())
 937     {
 938         case wxJOIN_BEVEL: { joinStyle = GDK_JOIN_BEVEL; break; }
 939         case wxJOIN_ROUND: { joinStyle = GDK_JOIN_ROUND; break; }
 940         case wxJOIN_MITER: { joinStyle = GDK_JOIN_MITER; break; }
 941     }
 942
 943     gdk_gc_set_line_attributes( m_penGC, width, lineStyle, capStyle, joinStyle );
 944
 945     m_pen.GetColour().CalcPixel( m_cmap );
 946     gdk_gc_set_foreground( m_penGC, m_pen.GetColour().GetColor() );
 947 }
 948
 949 void wxWindowDC::SetBrush( const wxBrush &brush )
 950 {
 951     wxCHECK_RET( Ok(), "invalid window dc" );
 952
 953     if (m_brush == brush) return;
 954
 955     m_brush = brush;
 956
 957     if (!m_brush.Ok()) return;
 958
 959     m_brush.GetColour().CalcPixel( m_cmap );
 960     gdk_gc_set_foreground( m_brushGC, m_brush.GetColour().GetColor() );
 961
 962     GdkFill fillStyle = GDK_SOLID;
 963     switch (m_brush.GetStyle())
 964     {
 965       case wxSOLID:
 966       case wxTRANSPARENT:
 967          break;
 968       default:
 969          fillStyle = GDK_STIPPLED;
 970     }
 971
 972     gdk_gc_set_fill( m_brushGC, fillStyle );
 973
 974     if (m_brush.GetStyle() == wxSTIPPLE)
 975     {
 976         gdk_gc_set_stipple( m_brushGC, m_brush.GetStipple()->GetPixmap() );
 977     }
 978
 979     if (IS_HATCH(m_brush.GetStyle()))
 980     {
 981         int num = m_brush.GetStyle() - wxBDIAGONAL_HATCH;
 982         gdk_gc_set_stipple( m_brushGC, hatches[num] );
 983     }
 984 }
 985
 986 void wxWindowDC::SetBackground( const wxBrush &brush )
 987 {
 988    /* CMB 21/7/98: Added SetBackground. Sets background brush
 989     * for Clear() and bg colour for shapes filled with cross-hatch brush */
 990
 991     wxCHECK_RET( Ok(), "invalid window dc" );
 992
 993     if (m_backgroundBrush == brush) return;
 994
 995     m_backgroundBrush = brush;
 996
 997     if (!m_backgroundBrush.Ok()) return;
 998
 999     m_backgroundBrush.GetColour().CalcPixel( m_cmap );
1000     gdk_gc_set_background( m_brushGC, m_backgroundBrush.GetColour().GetColor() );
1001     gdk_gc_set_background( m_penGC, m_backgroundBrush.GetColour().GetColor() );
1002     gdk_gc_set_background( m_bgGC, m_backgroundBrush.GetColour().GetColor() );
1003     gdk_gc_set_foreground( m_bgGC, m_backgroundBrush.GetColour().GetColor() );
1004
1005     GdkFill fillStyle = GDK_SOLID;
1006     switch (m_backgroundBrush.GetStyle())
1007     {
1008         case wxSOLID:
1009         case wxTRANSPARENT:
1010             break;
1011         default:
1012             fillStyle = GDK_STIPPLED;
1013     }
1014
1015     gdk_gc_set_fill( m_bgGC, fillStyle );
1016
1017     if (m_backgroundBrush.GetStyle() == wxSTIPPLE)
1018     {
1019         gdk_gc_set_stipple( m_bgGC, m_backgroundBrush.GetStipple()->GetPixmap() );
1020     }
1021
1022     if (IS_HATCH(m_backgroundBrush.GetStyle()))
1023     {
1024         int num = m_backgroundBrush.GetStyle() - wxBDIAGONAL_HATCH;
1025         gdk_gc_set_stipple( m_bgGC, hatches[num] );
1026     }
1027 }
1028
1029 void wxWindowDC::SetLogicalFunction( int function )
1030 {
1031     wxCHECK_RET( Ok(), "invalid window dc" );
1032
1033     if (m_logicalFunction == function) return;
1034
1035     GdkFunction mode = GDK_COPY;
1036     switch (function)
1037     {
1038         case wxXOR:    mode = GDK_INVERT; break;
1039         case wxINVERT: mode = GDK_INVERT; break;
1040         default:       break;
1041     }
1042
1043     m_logicalFunction = function;
1044     gdk_gc_set_function( m_penGC, mode );
1045     gdk_gc_set_function( m_brushGC, mode );
1046     gdk_gc_set_function( m_textGC, mode );
1047 }
1048
1049 void wxWindowDC::SetTextForeground( const wxColour &col )
1050 {
1051     wxCHECK_RET( Ok(), "invalid window dc" );
1052
1053     if (m_textForegroundColour == col) return;
1054
1055     m_textForegroundColour = col;
1056     if (!m_textForegroundColour.Ok()) return;
1057
1058     m_textForegroundColour.CalcPixel( m_cmap );
1059     gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );
1060 }
1061
1062 void wxWindowDC::SetTextBackground( const wxColour &col )
1063 {
1064     wxCHECK_RET( Ok(), "invalid window dc" );
1065
1066     if (m_textBackgroundColour == col) return;
1067
1068     m_textBackgroundColour = col;
1069     if (!m_textBackgroundColour.Ok()) return;
1070
1071     m_textBackgroundColour.CalcPixel( m_cmap );
1072     gdk_gc_set_background( m_textGC, m_textBackgroundColour.GetColor() );
1073 }
1074
1075 void wxWindowDC::SetBackgroundMode( int mode )
1076 {
1077     wxCHECK_RET( Ok(), "invalid window dc" );
1078
1079     m_backgroundMode = mode;
1080
1081     // CMB 21/7/98: fill style of cross-hatch brushes is affected by
1082     // transparent/solid background mode
1083
1084     if (m_brush.GetStyle() != wxSOLID && m_brush.GetStyle() != wxTRANSPARENT)
1085     {
1086         gdk_gc_set_fill( m_brushGC,
1087           (m_backgroundMode == wxTRANSPARENT) ? GDK_STIPPLED : GDK_OPAQUE_STIPPLED);
1088     }
1089 }
1090
1091 void wxWindowDC::SetPalette( const wxPalette& WXUNUSED(palette) )
1092 {
1093     wxFAIL_MSG( "wxWindowDC::SetPalette not implemented" );
1094 }
1095
1096 void wxWindowDC::SetClippingRegion( long x, long y, long width, long height )
1097 {
1098     wxCHECK_RET( Ok(), "invalid window dc" );
1099
1100     wxDC::SetClippingRegion( x, y, width, height );
1101
1102     GdkRectangle rect;
1103     rect.x = XLOG2DEV(x);
1104     rect.y = YLOG2DEV(y);
1105     rect.width = XLOG2DEVREL(width);
1106     rect.height = YLOG2DEVREL(height);
1107     gdk_gc_set_clip_rectangle( m_penGC, &rect );
1108     gdk_gc_set_clip_rectangle( m_brushGC, &rect );
1109     gdk_gc_set_clip_rectangle( m_textGC, &rect );
1110     gdk_gc_set_clip_rectangle( m_bgGC, &rect );
1111 }
1112
1113 void wxWindowDC::SetClippingRegion( const wxRegion &region  )
1114 {
1115     wxCHECK_RET( Ok(), "invalid window dc" );
1116
1117     if (region.Empty())
1118     {
1119         DestroyClippingRegion();
1120         return;
1121     }
1122
1123     gdk_gc_set_clip_region( m_penGC, region.GetRegion() );
1124     gdk_gc_set_clip_region( m_brushGC, region.GetRegion() );
1125     gdk_gc_set_clip_region( m_textGC, region.GetRegion() );
1126     gdk_gc_set_clip_region( m_bgGC, region.GetRegion() );
1127 }
1128
1129 void wxWindowDC::DestroyClippingRegion()
1130 {
1131     wxCHECK_RET( Ok(), "invalid window dc" );
1132
1133     wxDC::DestroyClippingRegion();
1134
1135     gdk_gc_set_clip_rectangle( m_penGC, (GdkRectangle *) NULL );
1136     gdk_gc_set_clip_rectangle( m_brushGC, (GdkRectangle *) NULL );
1137     gdk_gc_set_clip_rectangle( m_textGC, (GdkRectangle *) NULL );
1138     gdk_gc_set_clip_rectangle( m_bgGC, (GdkRectangle *) NULL );
1139 }
1140
1141 void wxWindowDC::SetUpDC()
1142 {
1143     Destroy();
1144     m_ok = TRUE;
1145     m_logicalFunction = wxCOPY;
1146     m_penGC = gdk_gc_new( m_window );
1147     m_brushGC = gdk_gc_new( m_window );
1148     m_textGC = gdk_gc_new( m_window );
1149     m_bgGC = gdk_gc_new( m_window );
1150
1151     wxColour tmp_col( m_textForegroundColour );
1152     m_textForegroundColour = wxNullColour;
1153     SetTextForeground( tmp_col );
1154     tmp_col = m_textBackgroundColour;
1155     m_textBackgroundColour = wxNullColour;
1156     SetTextBackground( tmp_col );
1157
1158     wxPen tmp_pen( m_pen );
1159     m_pen = wxNullPen;
1160     SetPen( tmp_pen );
1161
1162     wxFont tmp_font( m_font );
1163     m_font = wxNullFont;
1164     SetFont( tmp_font );
1165
1166     wxBrush tmp_brush( m_brush );
1167     m_brush = wxNullBrush;
1168     SetBrush( tmp_brush );
1169
1170     tmp_brush = m_backgroundBrush;
1171     m_backgroundBrush = wxNullBrush;
1172     SetBackground( tmp_brush );
1173
1174     if (!hatch_bitmap)
1175     {
1176         hatch_bitmap    = hatches;
1177         hatch_bitmap[0] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, bdiag_bits, bdiag_width, bdiag_height );
1178         hatch_bitmap[1] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, cdiag_bits, cdiag_width, cdiag_height );
1179         hatch_bitmap[2] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, fdiag_bits, fdiag_width, fdiag_height );
1180         hatch_bitmap[3] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, cross_bits, cross_width, cross_height );
1181         hatch_bitmap[4] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, horiz_bits, horiz_width, horiz_height );
1182         hatch_bitmap[5] = gdk_bitmap_create_from_data( (GdkWindow *) NULL, verti_bits, verti_width, verti_height );
1183     }
1184 }
1185
1186 void wxWindowDC::Destroy()
1187 {
1188     if (m_penGC) gdk_gc_unref( m_penGC );
1189     m_penGC = (GdkGC*) NULL;
1190     if (m_brushGC) gdk_gc_unref( m_brushGC );
1191     m_brushGC = (GdkGC*) NULL;
1192     if (m_textGC) gdk_gc_unref( m_textGC );
1193     m_textGC = (GdkGC*) NULL;
1194     if (m_bgGC) gdk_gc_unref( m_bgGC );
1195     m_bgGC = (GdkGC*) NULL;
1196 }
1197
1198 GdkWindow *wxWindowDC::GetWindow()
1199 {
1200     return m_window;
1201 }
1202
1203 // ----------------------------------- spline code ----------------------------------------
1204
1205 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
1206                          double a3, double b3, double a4, double b4);
1207 void wx_clear_stack();
1208 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
1209         double *y3, double *x4, double *y4);
1210 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
1211           double x4, double y4);
1212 static bool wx_spline_add_point(double x, double y);
1213 static void wx_spline_draw_point_array(wxDC *dc);
1214
1215 wxList wx_spline_point_list;
1216
1217 #define         half(z1, z2)    ((z1+z2)/2.0)
1218 #define         THRESHOLD       5
1219
1220 /* iterative version */
1221
1222 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
1223                  double b4)
1224 {
1225     register double  xmid, ymid;
1226     double           x1, y1, x2, y2, x3, y3, x4, y4;
1227
1228     wx_clear_stack();
1229     wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
1230
1231     while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
1232         xmid = (double)half(x2, x3);
1233         ymid = (double)half(y2, y3);
1234         if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
1235             fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
1236             wx_spline_add_point( x1, y1 );
1237             wx_spline_add_point( xmid, ymid );
1238         } else {
1239             wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
1240                  (double)half(x3, x4), (double)half(y3, y4), x4, y4);
1241             wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
1242                  (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
1243         }
1244     }
1245 }
1246
1247 /* utilities used by spline drawing routines */
1248
1249 typedef struct wx_spline_stack_struct {
1250     double           x1, y1, x2, y2, x3, y3, x4, y4;
1251 } Stack;
1252
1253 #define         SPLINE_STACK_DEPTH             20
1254 static Stack    wx_spline_stack[SPLINE_STACK_DEPTH];
1255 static Stack   *wx_stack_top;
1256 static int      wx_stack_count;
1257
1258 void wx_clear_stack()
1259 {
1260     wx_stack_top = wx_spline_stack;
1261     wx_stack_count = 0;
1262 }
1263
1264 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
1265 {
1266     wx_stack_top->x1 = x1;
1267     wx_stack_top->y1 = y1;
1268     wx_stack_top->x2 = x2;
1269     wx_stack_top->y2 = y2;
1270     wx_stack_top->x3 = x3;
1271     wx_stack_top->y3 = y3;
1272     wx_stack_top->x4 = x4;
1273     wx_stack_top->y4 = y4;
1274     wx_stack_top++;
1275     wx_stack_count++;
1276 }
1277
1278 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
1279                   double *x3, double *y3, double *x4, double *y4)
1280 {
1281     if (wx_stack_count == 0)
1282         return (0);
1283     wx_stack_top--;
1284     wx_stack_count--;
1285     *x1 = wx_stack_top->x1;
1286     *y1 = wx_stack_top->y1;
1287     *x2 = wx_stack_top->x2;
1288     *y2 = wx_stack_top->y2;
1289     *x3 = wx_stack_top->x3;
1290     *y3 = wx_stack_top->y3;
1291     *x4 = wx_stack_top->x4;
1292     *y4 = wx_stack_top->y4;
1293     return (1);
1294 }
1295
1296 static bool wx_spline_add_point(double x, double y)
1297 {
1298   wxPoint *point = new wxPoint ;
1299   point->x = (int) x;
1300   point->y = (int) y;
1301   wx_spline_point_list.Append((wxObject*)point);
1302   return TRUE;
1303 }
1304
1305 static void wx_spline_draw_point_array(wxDC *dc)
1306 {
1307   dc->DrawLines(&wx_spline_point_list, 0, 0 );
1308   wxNode *node = wx_spline_point_list.First();
1309   while (node)
1310   {
1311     wxPoint *point = (wxPoint *)node->Data();
1312     delete point;
1313     delete node;
1314     node = wx_spline_point_list.First();
1315   }
1316 }
1317
1318 void wxWindowDC::DrawSpline( wxList *points )
1319 {
1320     wxCHECK_RET( Ok(), "invalid window dc" );
1321
1322     wxPoint *p;
1323     double           cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
1324     double           x1, y1, x2, y2;
1325
1326     wxNode *node = points->First();
1327     p = (wxPoint *)node->Data();
1328
1329     x1 = p->x;
1330     y1 = p->y;
1331
1332     node = node->Next();
1333     p = (wxPoint *)node->Data();
1334
1335     x2 = p->x;
1336     y2 = p->y;
1337     cx1 = (double)((x1 + x2) / 2);
1338     cy1 = (double)((y1 + y2) / 2);
1339     cx2 = (double)((cx1 + x2) / 2);
1340     cy2 = (double)((cy1 + y2) / 2);
1341
1342     wx_spline_add_point(x1, y1);
1343
1344     while ((node = node->Next()) != NULL)
1345     {
1346         p = (wxPoint *)node->Data();
1347         x1 = x2;
1348         y1 = y2;
1349         x2 = p->x;
1350         y2 = p->y;
1351         cx4 = (double)(x1 + x2) / 2;
1352         cy4 = (double)(y1 + y2) / 2;
1353         cx3 = (double)(x1 + cx4) / 2;
1354         cy3 = (double)(y1 + cy4) / 2;
1355
1356         wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
1357
1358         cx1 = cx4;
1359         cy1 = cy4;
1360         cx2 = (double)(cx1 + x2) / 2;
1361         cy2 = (double)(cy1 + y2) / 2;
1362     }
1363
1364     wx_spline_add_point( cx1, cy1 );
1365     wx_spline_add_point( x2, y2 );
1366
1367     wx_spline_draw_point_array( this );
1368 }
1369
1370
1371 //-----------------------------------------------------------------------------
1372 // wxPaintDC
1373 //-----------------------------------------------------------------------------
1374
1375 IMPLEMENT_DYNAMIC_CLASS(wxPaintDC,wxWindowDC)
1376
1377 wxPaintDC::wxPaintDC()
1378   : wxWindowDC()
1379 {
1380 }
1381
1382 wxPaintDC::wxPaintDC( wxWindow *win )
1383   : wxWindowDC( win )
1384 {
1385 }
1386
1387 //-----------------------------------------------------------------------------
1388 // wxClientDC
1389 //-----------------------------------------------------------------------------
1390
1391 IMPLEMENT_DYNAMIC_CLASS(wxClientDC,wxWindowDC)
1392
1393 wxClientDC::wxClientDC()
1394   : wxWindowDC()
1395 {
1396 }
1397
1398 wxClientDC::wxClientDC( wxWindow *win )
1399   : wxWindowDC( win )
1400 {
1401 }
1402