src/motif/dcclient.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dcclient.cpp
   3 // Purpose:     wxClientDC class
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "dcclient.h"
  14 #endif
  15
  16 #include "wx/dcclient.h"
  17 #include "wx/dcmemory.h"
  18 #include <math.h>
  19
  20 //-----------------------------------------------------------------------------
  21 // constants
  22 //-----------------------------------------------------------------------------
  23
  24 #define RAD2DEG 57.2957795131
  25
  26 //-----------------------------------------------------------------------------
  27 // wxPaintDC
  28 //-----------------------------------------------------------------------------
  29
  30 #if !USE_SHARED_LIBRARY
  31 //IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxDC)
  32 //IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC)
  33 IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxDC)
  34 #endif
  35
  36
  37 wxPaintDC::wxPaintDC(void)
  38 {
  39 };
  40
  41 wxPaintDC::wxPaintDC( wxWindow *window )
  42 {
  43 };
  44
  45 wxPaintDC::~wxPaintDC(void)
  46 {
  47 };
  48
  49 void wxPaintDC::FloodFill( long WXUNUSED(x1), long WXUNUSED(y1),
  50   wxColour* WXUNUSED(col), int WXUNUSED(style) )
  51 {
  52 };
  53
  54 bool wxPaintDC::GetPixel( long WXUNUSED(x1), long WXUNUSED(y1), wxColour *WXUNUSED(col) ) const
  55 {
  56   return FALSE;
  57 };
  58
  59 void wxPaintDC::DrawLine( long x1, long y1, long x2, long y2 )
  60 {
  61   if (!Ok()) return;
  62
  63 };
  64
  65 void wxPaintDC::CrossHair( long x, long y )
  66 {
  67   if (!Ok()) return;
  68
  69 };
  70
  71 void wxPaintDC::DrawArc( long x1, long y1, long x2, long y2, long xc, long yc )
  72 {
  73   if (!Ok()) return;
  74
  75   long xx1 = XLOG2DEV(x1);
  76   long yy1 = YLOG2DEV(y1);
  77   long xx2 = XLOG2DEV(x2);
  78   long yy2 = YLOG2DEV(y2);
  79   long xxc = XLOG2DEV((long)xc);
  80   long yyc = YLOG2DEV((long)yc);
  81   double dx = xx1 - xxc;
  82   double dy = yy1 - yyc;
  83   double radius = sqrt(dx*dx+dy*dy);
  84   long   r      = (long)radius;
  85   double radius1, radius2;
  86
  87   if (xx1 == xx2 && yy1 == yy2)
  88   {
  89     radius1 = 0.0;
  90     radius2 = 360.0;
  91   }
  92   else
  93   if (radius == 0.0)
  94   {
  95     radius1 = radius2 = 0.0;
  96   }
  97   else
  98   {
  99     radius1 = (xx1 - xxc == 0) ?
 100             (yy1 - yyc < 0) ? 90.0 : -90.0 :
 101             -atan2(double(yy1-yyc), double(xx1-xxc)) * RAD2DEG;
 102     radius2 = (xx2 - xxc == 0) ?
 103             (yy2 - yyc < 0) ? 90.0 : -90.0 :
 104             -atan2(double(yy2-yyc), double(xx2-xxc)) * RAD2DEG;
 105   };
 106   long alpha1 = long(radius1 * 64.0);
 107   long alpha2 = long((radius2 - radius1) * 64.0);
 108   while (alpha2 <= 0) alpha2 += 360*64;
 109   while (alpha1 > 360*64) alpha1 -= 360*64;
 110
 111   if (m_brush.GetStyle() != wxTRANSPARENT) {};
 112
 113   if (m_pen.GetStyle() != wxTRANSPARENT) {};
 114
 115 };
 116
 117 void wxPaintDC::DrawEllipticArc( long x, long y, long width, long height, double sa, double ea )
 118 {
 119   if (!Ok()) return;
 120
 121   long xx = XLOG2DEV(x);
 122   long yy = YLOG2DEV(y);
 123   long ww = m_signX * XLOG2DEVREL(width);
 124   long hh = m_signY * YLOG2DEVREL(height);
 125
 126   // CMB: handle -ve width and/or height
 127   if (ww < 0) { ww = -ww; xx = xx - ww; }
 128   if (hh < 0) { hh = -hh; yy = yy - hh; }
 129
 130   long start = long(sa * 64.0);
 131   long end = long(ea * 64.0);
 132   if (m_brush.GetStyle() != wxTRANSPARENT) {};
 133
 134   if (m_pen.GetStyle() != wxTRANSPARENT) {};
 135 };
 136
 137 void wxPaintDC::DrawPoint( long x, long y )
 138 {
 139   if (!Ok()) return;
 140
 141   if (m_pen.GetStyle() != wxTRANSPARENT) {};
 142 };
 143
 144 void wxPaintDC::DrawLines( int n, wxPoint points[], long xoffset, long yoffset )
 145 {
 146   if (!Ok()) return;
 147
 148   if (m_pen.GetStyle() == wxTRANSPARENT) return;
 149
 150   for (int i = 0; i < n-1; i++)
 151   {
 152     long x1 = XLOG2DEV(points[i].x + xoffset);
 153     long x2 = XLOG2DEV(points[i+1].x + xoffset);
 154     long y1 = YLOG2DEV(points[i].y + yoffset);     // oh, what a waste
 155     long y2 = YLOG2DEV(points[i+1].y + yoffset);
 156   };
 157 };
 158
 159 void wxPaintDC::DrawLines( wxList *points, long xoffset, long yoffset )
 160 {
 161   if (!Ok()) return;
 162
 163   if (m_pen.GetStyle() == wxTRANSPARENT) return;
 164
 165   wxNode *node = points->First();
 166   while (node->Next())
 167   {
 168     wxPoint *point = (wxPoint*)node->Data();
 169     wxPoint *npoint = (wxPoint*)node->Next()->Data();
 170     long x1 = XLOG2DEV(point->x + xoffset);
 171     long x2 = XLOG2DEV(npoint->x + xoffset);
 172     long y1 = YLOG2DEV(point->y + yoffset);    // and again...
 173     long y2 = YLOG2DEV(npoint->y + yoffset);
 174     node = node->Next();
 175   };
 176 };
 177
 178 void wxPaintDC::DrawPolygon( int WXUNUSED(n), wxPoint WXUNUSED(points)[],
 179   long WXUNUSED(xoffset), long WXUNUSED(yoffset), int WXUNUSED(fillStyle) )
 180 {
 181   if (!Ok()) return;
 182 };
 183
 184 void wxPaintDC::DrawPolygon( wxList *WXUNUSED(lines), long WXUNUSED(xoffset),
 185                              long WXUNUSED(yoffset), int WXUNUSED(fillStyle) )
 186 {
 187   if (!Ok()) return;
 188 };
 189
 190 void wxPaintDC::DrawRectangle( long x, long y, long width, long height )
 191 {
 192   if (!Ok()) return;
 193
 194   long xx = XLOG2DEV(x);
 195   long yy = YLOG2DEV(y);
 196   long ww = m_signX * XLOG2DEVREL(width);
 197   long hh = m_signY * YLOG2DEVREL(height);
 198
 199   // CMB: draw nothing if transformed w or h is 0
 200   if (ww == 0 || hh == 0) return;
 201
 202   // CMB: handle -ve width and/or height
 203   if (ww < 0) { ww = -ww; xx = xx - ww; }
 204   if (hh < 0) { hh = -hh; yy = yy - hh; }
 205
 206   if (m_brush.GetStyle() != wxTRANSPARENT) {};
 207
 208   if (m_pen.GetStyle() != wxTRANSPARENT) {};
 209 };
 210
 211 void wxPaintDC::DrawRoundedRectangle( long x, long y, long width, long height, double radius )
 212 {
 213   if (!Ok()) return;
 214
 215   if (radius < 0.0) radius = - radius * ((width < height) ? width : height);
 216
 217   long xx = XLOG2DEV(x);
 218   long yy = YLOG2DEV(y);
 219   long ww = m_signX * XLOG2DEVREL(width);
 220   long hh = m_signY * YLOG2DEVREL(height);
 221   long rr = XLOG2DEVREL((long)radius);
 222
 223   // CMB: handle -ve width and/or height
 224   if (ww < 0) { ww = -ww; xx = xx - ww; }
 225   if (hh < 0) { hh = -hh; yy = yy - hh; }
 226
 227   // CMB: if radius is zero use DrawRectangle() instead to avoid
 228   // X drawing errors with small radii
 229   if (rr == 0)
 230   {
 231     DrawRectangle( x, y, width, height );
 232     return;
 233   }
 234
 235   // CMB: draw nothing if transformed w or h is 0
 236   if (ww == 0 || hh == 0) return;
 237
 238   // CMB: adjust size if outline is drawn otherwise the result is
 239   // 1 pixel too wide and high
 240   if (m_pen.GetStyle() != wxTRANSPARENT)
 241   {
 242     ww--;
 243     hh--;
 244   }
 245
 246   // CMB: ensure dd is not larger than rectangle otherwise we
 247   // get an hour glass shape
 248   long dd = 2 * rr;
 249   if (dd > ww) dd = ww;
 250   if (dd > hh) dd = hh;
 251   rr = dd / 2;
 252
 253   if (m_brush.GetStyle() != wxTRANSPARENT)
 254   {
 255   };
 256
 257   if (m_pen.GetStyle() != wxTRANSPARENT)
 258   {
 259   };
 260 };
 261
 262 void wxPaintDC::DrawEllipse( long x, long y, long width, long height )
 263 {
 264   if (!Ok()) return;
 265
 266   long xx = XLOG2DEV(x);
 267   long yy = YLOG2DEV(y);
 268   long ww = m_signX * XLOG2DEVREL(width);
 269   long hh = m_signY * YLOG2DEVREL(height);
 270
 271   // CMB: handle -ve width and/or height
 272   if (ww < 0) { ww = -ww; xx = xx - ww; }
 273   if (hh < 0) { hh = -hh; yy = yy - hh; }
 274
 275   if (m_brush.GetStyle() != wxTRANSPARENT) {};
 276
 277   if (m_pen.GetStyle() != wxTRANSPARENT) {};
 278 };
 279
 280 bool wxPaintDC::CanDrawBitmap(void) const
 281 {
 282   return TRUE;
 283 };
 284
 285 void wxPaintDC::DrawIcon( const wxIcon &icon, long x, long y, bool useMask )
 286 {
 287   if (!Ok()) return;
 288
 289   if (!icon.Ok()) return;
 290
 291   int xx = XLOG2DEV(x);
 292   int yy = YLOG2DEV(y);
 293
 294 };
 295
 296 bool wxPaintDC::Blit( long xdest, long ydest, long width, long height,
 297        wxDC *source, long xsrc, long ysrc, int WXUNUSED(logical_func), bool WXUNUSED(useMask) )
 298 {
 299   if (!Ok()) return FALSE;
 300
 301   // CMB 20/5/98: add blitting of bitmaps
 302   if (source->IsKindOf(CLASSINFO(wxMemoryDC)))
 303   {
 304     wxMemoryDC* srcDC = (wxMemoryDC*)source;
 305     /*
 306      GdkBitmap* bmap = srcDC->m_selected.GetBitmap();
 307     if (bmap)
 308     {
 309       gdk_draw_bitmap (
 310           m_window,
 311           m_textGC,
 312           bmap,
 313           source->DeviceToLogicalX(xsrc), source->DeviceToLogicalY(ysrc),
 314           XLOG2DEV(xdest), YLOG2DEV(ydest),
 315           source->DeviceToLogicalXRel(width), source->DeviceToLogicalYRel(height)
 316           );
 317       return TRUE;
 318     }
 319     */
 320   }
 321
 322   return TRUE;
 323 };
 324
 325 void wxPaintDC::DrawText( const wxString &text, long x, long y, bool
 326 WXUNUSED(use16) )
 327 {
 328   if (!Ok()) return;
 329
 330 };
 331
 332
 333
 334 bool wxPaintDC::CanGetTextExtent(void) const
 335 {
 336   return TRUE;
 337 };
 338
 339 void wxPaintDC::GetTextExtent( const wxString &string, long *width, long *height,
 340                      long *WXUNUSED(descent), long *WXUNUSED(externalLeading),
 341                      wxFont *WXUNUSED(theFont), bool WXUNUSED(use16) )
 342 {
 343   if (!Ok()) return;
 344
 345 };
 346
 347 long wxPaintDC::GetCharWidth(void)
 348 {
 349   if (!Ok()) return 0;
 350   return 0;
 351 };
 352
 353 long wxPaintDC::GetCharHeight(void)
 354 {
 355   if (!Ok()) return 0;
 356   return 0;
 357 };
 358
 359 void wxPaintDC::Clear(void)
 360 {
 361   if (!Ok()) return;
 362
 363 };
 364
 365 void wxPaintDC::SetFont( const wxFont &font )
 366 {
 367   if (!Ok()) return;
 368
 369   m_font = font;
 370 };
 371
 372 void wxPaintDC::SetPen( const wxPen &pen )
 373 {
 374   if (!Ok()) return;
 375
 376   if (m_pen == pen) return;
 377
 378   m_pen = pen;
 379
 380   if (!m_pen.Ok()) return;
 381 };
 382
 383 void wxPaintDC::SetBrush( const wxBrush &brush )
 384 {
 385   if (!Ok()) return;
 386
 387   if (m_brush == brush) return;
 388
 389   m_brush = brush;
 390
 391   if (!m_brush.Ok()) return;
 392
 393 };
 394
 395 void wxPaintDC::SetBackground( const wxBrush &brush )
 396 {
 397   if (!Ok()) return;
 398
 399   if (m_backgroundBrush == brush) return;
 400
 401   m_backgroundBrush = brush;
 402
 403   if (!m_backgroundBrush.Ok()) return;
 404
 405 };
 406
 407 void wxPaintDC::SetLogicalFunction( int function )
 408 {
 409   if (m_logicalFunction == function) return;
 410 };
 411
 412 void wxPaintDC::SetTextForeground( const wxColour &col )
 413 {
 414   if (!Ok()) return;
 415
 416   if (m_textForegroundColour == col) return;
 417
 418   m_textForegroundColour = col;
 419   if (!m_textForegroundColour.Ok()) return;
 420 };
 421
 422 void wxPaintDC::SetTextBackground( const wxColour &col )
 423 {
 424   if (!Ok()) return;
 425
 426   if (m_textBackgroundColour == col) return;
 427
 428   m_textBackgroundColour = col;
 429   if (!m_textBackgroundColour.Ok()) return;
 430 };
 431
 432 void wxPaintDC::SetBackgroundMode( int mode )
 433 {
 434   m_backgroundMode = mode;
 435
 436   if (m_brush.GetStyle() != wxSOLID && m_brush.GetStyle() != wxTRANSPARENT)
 437   {
 438   }
 439 };
 440
 441 void wxPaintDC::SetPalette( const wxPalette& WXUNUSED(palette) )
 442 {
 443 };
 444
 445 void wxPaintDC::SetClippingRegion( long x, long y, long width, long height )
 446 {
 447   wxDC::SetClippingRegion( x, y, width, height );
 448
 449 };
 450
 451 void wxPaintDC::DestroyClippingRegion(void)
 452 {
 453   wxDC::DestroyClippingRegion();
 454
 455 };
 456
 457 // ----------------------------------- spline code ----------------------------------------
 458
 459 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
 460                          double a3, double b3, double a4, double b4);
 461 void wx_clear_stack(void);
 462 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
 463         double *y3, double *x4, double *y4);
 464 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
 465           double x4, double y4);
 466 static bool wx_spline_add_point(double x, double y);
 467 static void wx_spline_draw_point_array(wxDC *dc);
 468
 469 wxList wx_spline_point_list;
 470
 471 #define         half(z1, z2)    ((z1+z2)/2.0)
 472 #define         THRESHOLD       5
 473
 474 /* iterative version */
 475
 476 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
 477                  double b4)
 478 {
 479     register double  xmid, ymid;
 480     double           x1, y1, x2, y2, x3, y3, x4, y4;
 481
 482     wx_clear_stack();
 483     wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
 484
 485     while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
 486         xmid = (double)half(x2, x3);
 487         ymid = (double)half(y2, y3);
 488         if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
 489             fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
 490             wx_spline_add_point( x1, y1 );
 491             wx_spline_add_point( xmid, ymid );
 492         } else {
 493             wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
 494                  (double)half(x3, x4), (double)half(y3, y4), x4, y4);
 495             wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
 496                  (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
 497         }
 498     }
 499 }
 500
 501 /* utilities used by spline drawing routines */
 502
 503 typedef struct wx_spline_stack_struct {
 504     double           x1, y1, x2, y2, x3, y3, x4, y4;
 505 } Stack;
 506
 507 #define         SPLINE_STACK_DEPTH             20
 508 static Stack    wx_spline_stack[SPLINE_STACK_DEPTH];
 509 static Stack   *wx_stack_top;
 510 static int      wx_stack_count;
 511
 512 void wx_clear_stack(void)
 513 {
 514     wx_stack_top = wx_spline_stack;
 515     wx_stack_count = 0;
 516 }
 517
 518 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
 519 {
 520     wx_stack_top->x1 = x1;
 521     wx_stack_top->y1 = y1;
 522     wx_stack_top->x2 = x2;
 523     wx_stack_top->y2 = y2;
 524     wx_stack_top->x3 = x3;
 525     wx_stack_top->y3 = y3;
 526     wx_stack_top->x4 = x4;
 527     wx_stack_top->y4 = y4;
 528     wx_stack_top++;
 529     wx_stack_count++;
 530 }
 531
 532 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
 533                   double *x3, double *y3, double *x4, double *y4)
 534 {
 535     if (wx_stack_count == 0)
 536         return (0);
 537     wx_stack_top--;
 538     wx_stack_count--;
 539     *x1 = wx_stack_top->x1;
 540     *y1 = wx_stack_top->y1;
 541     *x2 = wx_stack_top->x2;
 542     *y2 = wx_stack_top->y2;
 543     *x3 = wx_stack_top->x3;
 544     *y3 = wx_stack_top->y3;
 545     *x4 = wx_stack_top->x4;
 546     *y4 = wx_stack_top->y4;
 547     return (1);
 548 }
 549
 550 static bool wx_spline_add_point(double x, double y)
 551 {
 552   wxPoint *point = new wxPoint ;
 553   point->x = (int) x;
 554   point->y = (int) y;
 555   wx_spline_point_list.Append((wxObject*)point);
 556   return TRUE;
 557 }
 558
 559 static void wx_spline_draw_point_array(wxDC *dc)
 560 {
 561   dc->DrawLines(&wx_spline_point_list, 0, 0 );
 562   wxNode *node = wx_spline_point_list.First();
 563   while (node)
 564   {
 565     wxPoint *point = (wxPoint *)node->Data();
 566     delete point;
 567     delete node;
 568     node = wx_spline_point_list.First();
 569   }
 570 }
 571
 572 void wxPaintDC::DrawOpenSpline( wxList *points )
 573 {
 574     wxPoint *p;
 575     double           cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
 576     double           x1, y1, x2, y2;
 577
 578     wxNode *node = points->First();
 579     p = (wxPoint *)node->Data();
 580
 581     x1 = p->x;
 582     y1 = p->y;
 583
 584     node = node->Next();
 585     p = (wxPoint *)node->Data();
 586
 587     x2 = p->x;
 588     y2 = p->y;
 589     cx1 = (double)((x1 + x2) / 2);
 590     cy1 = (double)((y1 + y2) / 2);
 591     cx2 = (double)((cx1 + x2) / 2);
 592     cy2 = (double)((cy1 + y2) / 2);
 593
 594     wx_spline_add_point(x1, y1);
 595
 596     while ((node = node->Next()) != NULL)
 597     {
 598         p = (wxPoint *)node->Data();
 599         x1 = x2;
 600         y1 = y2;
 601         x2 = p->x;
 602         y2 = p->y;
 603         cx4 = (double)(x1 + x2) / 2;
 604         cy4 = (double)(y1 + y2) / 2;
 605         cx3 = (double)(x1 + cx4) / 2;
 606         cy3 = (double)(y1 + cy4) / 2;
 607
 608         wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
 609
 610         cx1 = cx4;
 611         cy1 = cy4;
 612         cx2 = (double)(cx1 + x2) / 2;
 613         cy2 = (double)(cy1 + y2) / 2;
 614     }
 615
 616     wx_spline_add_point( cx1, cy1 );
 617     wx_spline_add_point( x2, y2 );
 618
 619     wx_spline_draw_point_array( this );
 620 };