src/hid/gtk/gtkhid-gdk.c

   1 #ifdef HAVE_CONFIG_H
   2 #include "config.h"
   3 #endif
   4
   5 #include <stdio.h>
   6
   7 #include "crosshair.h"
   8 #include "clip.h"
   9 #include "../hidint.h"
  10 #include "gui.h"
  11 #include "hid/common/draw_helpers.h"
  12
  13 #ifdef HAVE_LIBDMALLOC
  14 #include <dmalloc.h>
  15 #endif
  16
  17 extern HID ghid_hid;
  18 extern HID_DRAW ghid_graphics;
  19
  20 /* Sets priv->u_gc to the "right" GC to use (wrt mask or window)
  21 */
  22 #define USE_GC(gc) if (!use_gc(gc)) return
  23
  24 static enum mask_mode cur_mask = HID_MASK_OFF;
  25 static int mask_seq = 0;
  26
  27 typedef struct render_priv {
  28   GdkGC *bg_gc;
  29   GdkGC *offlimits_gc;
  30   GdkGC *mask_gc;
  31   GdkGC *u_gc;
  32   GdkGC *grid_gc;
  33   bool clip;
  34   GdkRectangle clip_rect;
  35   int attached_invalidate_depth;
  36   int mark_invalidate_depth;
  37
  38   /* Feature for leading the user to a particular location */
  39   guint lead_user_timeout;
  40   GTimer *lead_user_timer;
  41   bool lead_user;
  42   Coord lead_user_radius;
  43   Coord lead_user_x;
  44   Coord lead_user_y;
  45
  46   hidGC crosshair_gc;
  47 } render_priv;
  48
  49
  50 typedef struct gtk_gc_struct
  51 {
  52   struct hid_gc_struct hid_gc; /* Parent */
  53
  54   GdkGC *gdk_gc;
  55
  56   gchar *colorname;
  57   Coord width;
  58   gint cap, join;
  59   gchar xor_mask;
  60   gint mask_seq;
  61 } *gtkGC;
  62
  63
  64 static void draw_lead_user (render_priv *priv);
  65
  66
  67 int
  68 ghid_set_layer (const char *name, int group, int empty)
  69 {
  70   int idx = group;
  71   if (idx >= 0 && idx < max_group)
  72     {
  73       int n = PCB->LayerGroups.Number[group];
  74       for (idx = 0; idx < n-1; idx ++)
  75         {
  76           int ni = PCB->LayerGroups.Entries[group][idx];
  77           if (ni >= 0 && ni < max_copper_layer + 2
  78               && PCB->Data->Layer[ni].On)
  79             break;
  80         }
  81       idx = PCB->LayerGroups.Entries[group][idx];
  82     }
  83
  84   if (idx >= 0 && idx < max_copper_layer + 2)
  85     return /*pinout ? 1 : */ PCB->Data->Layer[idx].On;
  86   if (idx < 0)
  87     {
  88       switch (SL_TYPE (idx))
  89         {
  90         case SL_INVISIBLE:
  91           return /* pinout ? 0 : */ PCB->InvisibleObjectsOn;
  92         case SL_MASK:
  93           if (SL_MYSIDE (idx) /*&& !pinout */ )
  94             return TEST_FLAG (SHOWMASKFLAG, PCB);
  95           return 0;
  96         case SL_SILK:
  97           if (SL_MYSIDE (idx) /*|| pinout */ )
  98             return PCB->ElementOn;
  99           return 0;
 100         case SL_ASSY:
 101           return 0;
 102         case SL_PDRILL:
 103         case SL_UDRILL:
 104           return 1;
 105         case SL_RATS:
 106           return PCB->RatOn;
 107         }
 108     }
 109   return 0;
 110 }
 111
 112 void
 113 ghid_destroy_gc (hidGC gc)
 114 {
 115   gtkGC gtk_gc = (gtkGC)gc;
 116
 117   if (gtk_gc->gdk_gc)
 118     g_object_unref (gtk_gc->gdk_gc);
 119   g_free (gc);
 120 }
 121
 122 hidGC
 123 ghid_make_gc (void)
 124 {
 125   hidGC gc = (hidGC)g_new0 (struct gtk_gc_struct, 1);
 126   gtkGC gtk_gc = (gtkGC)gc;
 127
 128   gc->hid = &ghid_hid;
 129   gc->hid_draw = &ghid_graphics;
 130
 131   gtk_gc->colorname = Settings.BackgroundColor;
 132
 133   return gc;
 134 }
 135
 136 static void
 137 set_clip (render_priv *priv, GdkGC *gc)
 138 {
 139   if (gc == NULL)
 140     return;
 141
 142   if (priv->clip)
 143     gdk_gc_set_clip_rectangle (gc, &priv->clip_rect);
 144   else
 145     gdk_gc_set_clip_mask (gc, NULL);
 146 }
 147
 148 static void
 149 ghid_draw_grid (void)
 150 {
 151   static GdkPoint *points = 0;
 152   static int npoints = 0;
 153   Coord x1, y1, x2, y2, x, y;
 154   int n, i;
 155   render_priv *priv = gport->render_priv;
 156
 157   if (!Settings.DrawGrid)
 158     return;
 159   if (Vz (PCB->Grid) < MIN_GRID_DISTANCE)
 160     return;
 161   if (!priv->grid_gc)
 162     {
 163       if (gdk_color_parse (Settings.GridColor, &gport->grid_color))
 164         {
 165           gport->grid_color.red ^= gport->bg_color.red;
 166           gport->grid_color.green ^= gport->bg_color.green;
 167           gport->grid_color.blue ^= gport->bg_color.blue;
 168           gdk_color_alloc (gport->colormap, &gport->grid_color);
 169         }
 170       priv->grid_gc = gdk_gc_new (gport->drawable);
 171       gdk_gc_set_function (priv->grid_gc, GDK_XOR);
 172       gdk_gc_set_foreground (priv->grid_gc, &gport->grid_color);
 173       gdk_gc_set_clip_origin (priv->grid_gc, 0, 0);
 174       set_clip (priv, priv->grid_gc);
 175     }
 176   x1 = GridFit (SIDE_X (gport->view.x0), PCB->Grid, PCB->GridOffsetX);
 177   y1 = GridFit (SIDE_Y (gport->view.y0), PCB->Grid, PCB->GridOffsetY);
 178   x2 = GridFit (SIDE_X (gport->view.x0 + gport->view.width - 1),
 179                 PCB->Grid, PCB->GridOffsetX);
 180   y2 = GridFit (SIDE_Y (gport->view.y0 + gport->view.height - 1),
 181                 PCB->Grid, PCB->GridOffsetY);
 182   if (x1 > x2)
 183     {
 184       Coord tmp = x1;
 185       x1 = x2;
 186       x2 = tmp;
 187     }
 188   if (y1 > y2)
 189     {
 190       Coord tmp = y1;
 191       y1 = y2;
 192       y2 = tmp;
 193     }
 194   if (Vx (x1) < 0)
 195     x1 += PCB->Grid;
 196   if (Vy (y1) < 0)
 197     y1 += PCB->Grid;
 198   if (Vx (x2) >= gport->width)
 199     x2 -= PCB->Grid;
 200   if (Vy (y2) >= gport->height)
 201     y2 -= PCB->Grid;
 202   n = (x2 - x1) / PCB->Grid + 1;
 203   if (n > npoints)
 204     {
 205       npoints = n + 10;
 206       points = (GdkPoint *)realloc (points, npoints * sizeof (GdkPoint));
 207     }
 208   n = 0;
 209   for (x = x1; x <= x2; x += PCB->Grid)
 210     {
 211       points[n].x = Vx (x);
 212       n++;
 213     }
 214   if (n == 0)
 215     return;
 216   for (y = y1; y <= y2; y += PCB->Grid)
 217     {
 218       for (i = 0; i < n; i++)
 219         points[i].y = Vy (y);
 220       gdk_draw_points (gport->drawable, priv->grid_gc, points, n);
 221     }
 222 }
 223
 224 /* ------------------------------------------------------------ */
 225 static void
 226 ghid_draw_bg_image (void)
 227 {
 228   static GdkPixbuf *pixbuf;
 229   GdkInterpType interp_type;
 230   gint x, y, w, h, w_src, h_src;
 231   static gint w_scaled, h_scaled;
 232   render_priv *priv = gport->render_priv;
 233
 234   if (!ghidgui->bg_pixbuf)
 235     return;
 236
 237   w = PCB->MaxWidth / gport->view.coord_per_px;
 238   h = PCB->MaxHeight / gport->view.coord_per_px;
 239   x = gport->view.x0 / gport->view.coord_per_px;
 240   y = gport->view.y0 / gport->view.coord_per_px;
 241
 242   if (w_scaled != w || h_scaled != h)
 243     {
 244       if (pixbuf)
 245         g_object_unref (G_OBJECT (pixbuf));
 246
 247       w_src = gdk_pixbuf_get_width (ghidgui->bg_pixbuf);
 248       h_src = gdk_pixbuf_get_height (ghidgui->bg_pixbuf);
 249       if (w > w_src && h > h_src)
 250         interp_type = GDK_INTERP_NEAREST;
 251       else
 252         interp_type = GDK_INTERP_BILINEAR;
 253
 254       pixbuf =
 255         gdk_pixbuf_scale_simple (ghidgui->bg_pixbuf, w, h, interp_type);
 256       w_scaled = w;
 257       h_scaled = h;
 258     }
 259   if (pixbuf)
 260     gdk_pixbuf_render_to_drawable (pixbuf, gport->drawable, priv->bg_gc,
 261                                    x, y, 0, 0,
 262                                    w - x, h - y, GDK_RGB_DITHER_NORMAL, 0, 0);
 263 }
 264
 265 #define WHICH_GC(gtk_gc) (cur_mask == HID_MASK_CLEAR ? priv->mask_gc : (gtk_gc)->gdk_gc)
 266
 267 void
 268 ghid_use_mask (enum mask_mode mode)
 269 {
 270   static int mask_seq_id = 0;
 271   GdkColor color;
 272   render_priv *priv = gport->render_priv;
 273
 274   if (!gport->pixmap)
 275     return;
 276   if (mode == cur_mask)
 277     return;
 278   switch (mode)
 279     {
 280     case HID_MASK_OFF:
 281       gport->drawable = gport->pixmap;
 282       mask_seq = 0;
 283       break;
 284
 285     case HID_MASK_BEFORE:
 286       /* The HID asks not to receive this mask type, so warn if we get it */
 287       g_return_if_reached ();
 288
 289     case HID_MASK_CLEAR:
 290       if (!gport->mask)
 291         gport->mask = gdk_pixmap_new (0, gport->width, gport->height, 1);
 292       gport->drawable = gport->mask;
 293       mask_seq = 0;
 294       if (!priv->mask_gc)
 295         {
 296           priv->mask_gc = gdk_gc_new (gport->drawable);
 297           gdk_gc_set_clip_origin (priv->mask_gc, 0, 0);
 298           set_clip (priv, priv->mask_gc);
 299         }
 300       color.pixel = 1;
 301       gdk_gc_set_foreground (priv->mask_gc, &color);
 302       gdk_draw_rectangle (gport->drawable, priv->mask_gc, TRUE, 0, 0,
 303                           gport->width, gport->height);
 304       color.pixel = 0;
 305       gdk_gc_set_foreground (priv->mask_gc, &color);
 306       break;
 307
 308     case HID_MASK_AFTER:
 309       mask_seq_id++;
 310       if (!mask_seq_id)
 311         mask_seq_id = 1;
 312       mask_seq = mask_seq_id;
 313
 314       gport->drawable = gport->pixmap;
 315       break;
 316
 317     }
 318   cur_mask = mode;
 319 }
 320
 321
 322 typedef struct
 323 {
 324   int color_set;
 325   GdkColor color;
 326   int xor_set;
 327   GdkColor xor_color;
 328 } ColorCache;
 329
 330
 331   /* Config helper functions for when the user changes color preferences.
 332      |  set_special colors used in the gtkhid.
 333    */
 334 static void
 335 set_special_grid_color (void)
 336 {
 337   render_priv *priv = gport->render_priv;
 338
 339   if (!gport->colormap)
 340     return;
 341   gport->grid_color.red ^= gport->bg_color.red;
 342   gport->grid_color.green ^= gport->bg_color.green;
 343   gport->grid_color.blue ^= gport->bg_color.blue;
 344   gdk_color_alloc (gport->colormap, &gport->grid_color);
 345   if (priv->grid_gc)
 346     gdk_gc_set_foreground (priv->grid_gc, &gport->grid_color);
 347 }
 348
 349 void
 350 ghid_set_special_colors (HID_Attribute * ha)
 351 {
 352   render_priv *priv = gport->render_priv;
 353
 354   if (!ha->name || !ha->value)
 355     return;
 356   if (!strcmp (ha->name, "background-color") && priv->bg_gc)
 357     {
 358       ghid_map_color_string (*(char **) ha->value, &gport->bg_color);
 359       gdk_gc_set_foreground (priv->bg_gc, &gport->bg_color);
 360       set_special_grid_color ();
 361     }
 362   else if (!strcmp (ha->name, "off-limit-color") && priv->offlimits_gc)
 363     {
 364       ghid_map_color_string (*(char **) ha->value, &gport->offlimits_color);
 365       gdk_gc_set_foreground (priv->offlimits_gc, &gport->offlimits_color);
 366     }
 367   else if (!strcmp (ha->name, "grid-color") && priv->grid_gc)
 368     {
 369       ghid_map_color_string (*(char **) ha->value, &gport->grid_color);
 370       set_special_grid_color ();
 371     }
 372 }
 373
 374 void
 375 ghid_set_color (hidGC gc, const char *name)
 376 {
 377   gtkGC gtk_gc = (gtkGC)gc;
 378   static void *cache = 0;
 379   hidval cval;
 380
 381   if (name == NULL)
 382     {
 383       fprintf (stderr, "%s():  name = NULL, setting to magenta\n",
 384                __FUNCTION__);
 385       name = "magenta";
 386     }
 387
 388   gtk_gc->colorname = (char *) name;
 389   if (!gtk_gc->gdk_gc)
 390     return;
 391   if (gport->colormap == 0)
 392     gport->colormap = gtk_widget_get_colormap (gport->top_window);
 393
 394   if (strcmp (name, "erase") == 0)
 395     {
 396       gdk_gc_set_foreground (gtk_gc->gdk_gc, &gport->bg_color);
 397     }
 398   else if (strcmp (name, "drill") == 0)
 399     {
 400       gdk_gc_set_foreground (gtk_gc->gdk_gc, &gport->offlimits_color);
 401     }
 402   else
 403     {
 404       ColorCache *cc;
 405       if (hid_cache_color (0, name, &cval, &cache))
 406         cc = (ColorCache *) cval.ptr;
 407       else
 408         {
 409           cc = (ColorCache *) malloc (sizeof (ColorCache));
 410           memset (cc, 0, sizeof (*cc));
 411           cval.ptr = cc;
 412           hid_cache_color (1, name, &cval, &cache);
 413         }
 414
 415       if (!cc->color_set)
 416         {
 417           if (gdk_color_parse (name, &cc->color))
 418             gdk_color_alloc (gport->colormap, &cc->color);
 419           else
 420             gdk_color_white (gport->colormap, &cc->color);
 421           cc->color_set = 1;
 422         }
 423       if (gtk_gc->xor_mask)
 424         {
 425           if (!cc->xor_set)
 426             {
 427               cc->xor_color.red = cc->color.red ^ gport->bg_color.red;
 428               cc->xor_color.green = cc->color.green ^ gport->bg_color.green;
 429               cc->xor_color.blue = cc->color.blue ^ gport->bg_color.blue;
 430               gdk_color_alloc (gport->colormap, &cc->xor_color);
 431               cc->xor_set = 1;
 432             }
 433           gdk_gc_set_foreground (gtk_gc->gdk_gc, &cc->xor_color);
 434         }
 435       else
 436         {
 437           gdk_gc_set_foreground (gtk_gc->gdk_gc, &cc->color);
 438         }
 439     }
 440 }
 441
 442 void
 443 ghid_set_line_cap (hidGC gc, EndCapStyle style)
 444 {
 445   gtkGC gtk_gc = (gtkGC)gc;
 446   render_priv *priv = gport->render_priv;
 447
 448   switch (style)
 449     {
 450     case Trace_Cap:
 451     case Round_Cap:
 452       gtk_gc->cap = GDK_CAP_ROUND;
 453       gtk_gc->join = GDK_JOIN_ROUND;
 454       break;
 455     case Square_Cap:
 456     case Beveled_Cap:
 457       gtk_gc->cap = GDK_CAP_PROJECTING;
 458       gtk_gc->join = GDK_JOIN_MITER;
 459       break;
 460     }
 461   if (gtk_gc->gdk_gc)
 462     gdk_gc_set_line_attributes (WHICH_GC (gtk_gc),
 463                                 Vz (gtk_gc->width), GDK_LINE_SOLID,
 464                                 (GdkCapStyle)gtk_gc->cap, (GdkJoinStyle)gtk_gc->join);
 465 }
 466
 467 void
 468 ghid_set_line_width (hidGC gc, Coord width)
 469 {
 470   gtkGC gtk_gc = (gtkGC)gc;
 471   render_priv *priv = gport->render_priv;
 472
 473   gtk_gc->width = width;
 474   if (gtk_gc->gdk_gc)
 475     gdk_gc_set_line_attributes (WHICH_GC (gtk_gc),
 476                                 Vz (gtk_gc->width), GDK_LINE_SOLID,
 477                                 (GdkCapStyle)gtk_gc->cap, (GdkJoinStyle)gtk_gc->join);
 478 }
 479
 480 void
 481 ghid_set_draw_xor (hidGC gc, int xor_mask)
 482 {
 483   gtkGC gtk_gc = (gtkGC)gc;
 484
 485   gtk_gc->xor_mask = xor_mask;
 486   if (!gtk_gc->gdk_gc)
 487     return;
 488   gdk_gc_set_function (gtk_gc->gdk_gc, xor_mask ? GDK_XOR : GDK_COPY);
 489   ghid_set_color (gc, gtk_gc->colorname);
 490 }
 491
 492 static int
 493 use_gc (hidGC gc)
 494 {
 495   gtkGC gtk_gc = (gtkGC)gc;
 496   render_priv *priv = gport->render_priv;
 497   GdkWindow *window = gtk_widget_get_window (gport->top_window);
 498
 499   if (gc->hid != &ghid_hid)
 500     {
 501       fprintf (stderr, "Fatal: GC from another HID passed to GTK HID\n");
 502       abort ();
 503     }
 504
 505   if (!gport->pixmap)
 506     return 0;
 507   if (!gtk_gc->gdk_gc)
 508     {
 509       gtk_gc->gdk_gc = gdk_gc_new (window);
 510       ghid_set_color (gc, gtk_gc->colorname);
 511       ghid_set_line_width (gc, gtk_gc->width);
 512       ghid_set_line_cap (gc, (EndCapStyle)gtk_gc->cap);
 513       ghid_set_draw_xor (gc, gtk_gc->xor_mask);
 514       gdk_gc_set_clip_origin (gtk_gc->gdk_gc, 0, 0);
 515     }
 516   if (gtk_gc->mask_seq != mask_seq)
 517     {
 518       if (mask_seq)
 519         gdk_gc_set_clip_mask (gtk_gc->gdk_gc, gport->mask);
 520       else
 521         set_clip (priv, gtk_gc->gdk_gc);
 522       gtk_gc->mask_seq = mask_seq;
 523     }
 524   priv->u_gc = WHICH_GC (gtk_gc);
 525   return 1;
 526 }
 527
 528 void
 529 ghid_draw_line (hidGC gc, Coord x1, Coord y1, Coord x2, Coord y2)
 530 {
 531   gtkGC gtk_gc = (gtkGC)gc;
 532   double dx1, dy1, dx2, dy2;
 533   render_priv *priv = gport->render_priv;
 534
 535   dx1 = Vx ((double) x1);
 536   dy1 = Vy ((double) y1);
 537   dx2 = Vx ((double) x2);
 538   dy2 = Vy ((double) y2);
 539
 540   if (!ClipLine (0, 0, gport->width, gport->height,
 541                  &dx1, &dy1, &dx2, &dy2, gtk_gc->width / gport->view.coord_per_px))
 542     return;
 543
 544   USE_GC (gc);
 545   gdk_draw_line (gport->drawable, priv->u_gc, dx1, dy1, dx2, dy2);
 546 }
 547
 548 void
 549 ghid_draw_arc (hidGC gc, Coord cx, Coord cy,
 550                Coord xradius, Coord yradius, Angle start_angle, Angle delta_angle)
 551 {
 552   gint vrx, vry;
 553   gint w, h, radius;
 554   render_priv *priv = gport->render_priv;
 555
 556   w = gport->width * gport->view.coord_per_px;
 557   h = gport->height * gport->view.coord_per_px;
 558   radius = (xradius > yradius) ? xradius : yradius;
 559   if (SIDE_X (cx) < gport->view.x0 - radius
 560       || SIDE_X (cx) > gport->view.x0 + w + radius
 561       || SIDE_Y (cy) < gport->view.y0 - radius
 562       || SIDE_Y (cy) > gport->view.y0 + h + radius)
 563     return;
 564
 565   USE_GC (gc);
 566   vrx = Vz (xradius);
 567   vry = Vz (yradius);
 568
 569   if (gport->view.flip_x)
 570     {
 571       start_angle = 180 - start_angle;
 572       delta_angle = -delta_angle;
 573     }
 574   if (gport->view.flip_y)
 575     {
 576       start_angle = -start_angle;
 577       delta_angle = -delta_angle;
 578     }
 579   /* make sure we fall in the -180 to +180 range */
 580   start_angle = NormalizeAngle (start_angle);
 581   if (start_angle >= 180)  start_angle -= 360;
 582
 583   gdk_draw_arc (gport->drawable, priv->u_gc, 0,
 584                 Vx (cx) - vrx, Vy (cy) - vry,
 585                 vrx * 2, vry * 2, (start_angle + 180) * 64, delta_angle * 64);
 586 }
 587
 588 void
 589 ghid_draw_rect (hidGC gc, Coord x1, Coord y1, Coord x2, Coord y2)
 590 {
 591   gtkGC gtk_gc = (gtkGC)gc;
 592   gint w, h, lw;
 593   render_priv *priv = gport->render_priv;
 594
 595   lw = gtk_gc->width;
 596   w = gport->width * gport->view.coord_per_px;
 597   h = gport->height * gport->view.coord_per_px;
 598
 599   if ((SIDE_X (x1) < gport->view.x0 - lw
 600        && SIDE_X (x2) < gport->view.x0 - lw)
 601       || (SIDE_X (x1) > gport->view.x0 + w + lw
 602           && SIDE_X (x2) > gport->view.x0 + w + lw)
 603       || (SIDE_Y (y1) < gport->view.y0 - lw
 604           && SIDE_Y (y2) < gport->view.y0 - lw)
 605       || (SIDE_Y (y1) > gport->view.y0 + h + lw
 606           && SIDE_Y (y2) > gport->view.y0 + h + lw))
 607     return;
 608
 609   x1 = Vx (x1);
 610   y1 = Vy (y1);
 611   x2 = Vx (x2);
 612   y2 = Vy (y2);
 613
 614   if (x1 > x2)
 615     {
 616       gint xt = x1;
 617       x1 = x2;
 618       x2 = xt;
 619     }
 620   if (y1 > y2)
 621     {
 622       gint yt = y1;
 623       y1 = y2;
 624       y2 = yt;
 625     }
 626
 627   USE_GC (gc);
 628   gdk_draw_rectangle (gport->drawable, priv->u_gc, FALSE,
 629                       x1, y1, x2 - x1 + 1, y2 - y1 + 1);
 630 }
 631
 632
 633 void
 634 ghid_fill_circle (hidGC gc, Coord cx, Coord cy, Coord radius)
 635 {
 636   gint w, h, vr;
 637   render_priv *priv = gport->render_priv;
 638
 639   w = gport->width * gport->view.coord_per_px;
 640   h = gport->height * gport->view.coord_per_px;
 641   if (SIDE_X (cx) < gport->view.x0 - radius
 642       || SIDE_X (cx) > gport->view.x0 + w + radius
 643       || SIDE_Y (cy) < gport->view.y0 - radius
 644       || SIDE_Y (cy) > gport->view.y0 + h + radius)
 645     return;
 646
 647   USE_GC (gc);
 648   vr = Vz (radius);
 649   gdk_draw_arc (gport->drawable, priv->u_gc, TRUE,
 650                 Vx (cx) - vr, Vy (cy) - vr, vr * 2, vr * 2, 0, 360 * 64);
 651 }
 652
 653 void
 654 ghid_fill_polygon (hidGC gc, int n_coords, Coord *x, Coord *y)
 655 {
 656   static GdkPoint *points = 0;
 657   static int npoints = 0;
 658   int i;
 659   render_priv *priv = gport->render_priv;
 660   USE_GC (gc);
 661
 662   if (npoints < n_coords)
 663     {
 664       npoints = n_coords + 1;
 665       points = (GdkPoint *)realloc (points, npoints * sizeof (GdkPoint));
 666     }
 667   for (i = 0; i < n_coords; i++)
 668     {
 669       points[i].x = Vx (x[i]);
 670       points[i].y = Vy (y[i]);
 671     }
 672   gdk_draw_polygon (gport->drawable, priv->u_gc, 1, points, n_coords);
 673 }
 674
 675 void
 676 ghid_fill_rect (hidGC gc, Coord x1, Coord y1, Coord x2, Coord y2)
 677 {
 678   gtkGC gtk_gc = (gtkGC)gc;
 679   gint w, h, lw, xx, yy;
 680   render_priv *priv = gport->render_priv;
 681
 682   lw = gtk_gc->width;
 683   w = gport->width * gport->view.coord_per_px;
 684   h = gport->height * gport->view.coord_per_px;
 685
 686   if ((SIDE_X (x1) < gport->view.x0 - lw
 687        && SIDE_X (x2) < gport->view.x0 - lw)
 688       || (SIDE_X (x1) > gport->view.x0 + w + lw
 689           && SIDE_X (x2) > gport->view.x0 + w + lw)
 690       || (SIDE_Y (y1) < gport->view.y0 - lw
 691           && SIDE_Y (y2) < gport->view.y0 - lw)
 692       || (SIDE_Y (y1) > gport->view.y0 + h + lw
 693           && SIDE_Y (y2) > gport->view.y0 + h + lw))
 694     return;
 695
 696   x1 = Vx (x1);
 697   y1 = Vy (y1);
 698   x2 = Vx (x2);
 699   y2 = Vy (y2);
 700   if (x2 < x1)
 701     {
 702       xx = x1;
 703       x1 = x2;
 704       x2 = xx;
 705     }
 706   if (y2 < y1)
 707     {
 708       yy = y1;
 709       y1 = y2;
 710       y2 = yy;
 711     }
 712   USE_GC (gc);
 713   gdk_draw_rectangle (gport->drawable, priv->u_gc, TRUE,
 714                       x1, y1, x2 - x1 + 1, y2 - y1 + 1);
 715 }
 716
 717 static void
 718 redraw_region (GdkRectangle *rect)
 719 {
 720   int eleft, eright, etop, ebottom;
 721   BoxType region;
 722   render_priv *priv = gport->render_priv;
 723
 724   if (!gport->pixmap)
 725     return;
 726
 727   if (rect != NULL)
 728     {
 729       priv->clip_rect = *rect;
 730       priv->clip = true;
 731     }
 732   else
 733     {
 734       priv->clip_rect.x = 0;
 735       priv->clip_rect.y = 0;
 736       priv->clip_rect.width = gport->width;
 737       priv->clip_rect.height = gport->height;
 738       priv->clip = false;
 739     }
 740
 741   set_clip (priv, priv->bg_gc);
 742   set_clip (priv, priv->offlimits_gc);
 743   set_clip (priv, priv->mask_gc);
 744   set_clip (priv, priv->grid_gc);
 745
 746   region.X1 = MIN(Px(priv->clip_rect.x),
 747                   Px(priv->clip_rect.x + priv->clip_rect.width + 1));
 748   region.Y1 = MIN(Py(priv->clip_rect.y),
 749                   Py(priv->clip_rect.y + priv->clip_rect.height + 1));
 750   region.X2 = MAX(Px(priv->clip_rect.x),
 751                   Px(priv->clip_rect.x + priv->clip_rect.width + 1));
 752   region.Y2 = MAX(Py(priv->clip_rect.y),
 753                   Py(priv->clip_rect.y + priv->clip_rect.height + 1));
 754
 755   region.X1 = MAX (0, MIN (PCB->MaxWidth,  region.X1));
 756   region.X2 = MAX (0, MIN (PCB->MaxWidth,  region.X2));
 757   region.Y1 = MAX (0, MIN (PCB->MaxHeight, region.Y1));
 758   region.Y2 = MAX (0, MIN (PCB->MaxHeight, region.Y2));
 759
 760   eleft = Vx (0);
 761   eright = Vx (PCB->MaxWidth);
 762   etop = Vy (0);
 763   ebottom = Vy (PCB->MaxHeight);
 764   if (eleft > eright)
 765     {
 766       int tmp = eleft;
 767       eleft = eright;
 768       eright = tmp;
 769     }
 770   if (etop > ebottom)
 771     {
 772       int tmp = etop;
 773       etop = ebottom;
 774       ebottom = tmp;
 775     }
 776
 777   if (eleft > 0)
 778     gdk_draw_rectangle (gport->drawable, priv->offlimits_gc,
 779                         1, 0, 0, eleft, gport->height);
 780   else
 781     eleft = 0;
 782   if (eright < gport->width)
 783     gdk_draw_rectangle (gport->drawable, priv->offlimits_gc,
 784                         1, eright, 0, gport->width - eright, gport->height);
 785   else
 786     eright = gport->width;
 787   if (etop > 0)
 788     gdk_draw_rectangle (gport->drawable, priv->offlimits_gc,
 789                         1, eleft, 0, eright - eleft + 1, etop);
 790   else
 791     etop = 0;
 792   if (ebottom < gport->height)
 793     gdk_draw_rectangle (gport->drawable, priv->offlimits_gc,
 794                         1, eleft, ebottom, eright - eleft + 1,
 795                         gport->height - ebottom);
 796   else
 797     ebottom = gport->height;
 798
 799   gdk_draw_rectangle (gport->drawable, priv->bg_gc, 1,
 800                       eleft, etop, eright - eleft + 1, ebottom - etop + 1);
 801
 802   ghid_draw_bg_image();
 803
 804   hid_expose_callback (&ghid_hid, &region, 0);
 805   ghid_draw_grid ();
 806
 807   /* In some cases we are called with the crosshair still off */
 808   if (priv->attached_invalidate_depth == 0)
 809     DrawAttached (priv->crosshair_gc);
 810
 811   /* In some cases we are called with the mark still off */
 812   if (priv->mark_invalidate_depth == 0)
 813     DrawMark (priv->crosshair_gc);
 814
 815   draw_lead_user (priv);
 816
 817   priv->clip = false;
 818
 819   /* Rest the clip for bg_gc, as it is used outside this function */
 820   gdk_gc_set_clip_mask (priv->bg_gc, NULL);
 821 }
 822
 823 void
 824 ghid_invalidate_lr (int left, int right, int top, int bottom)
 825 {
 826   int dleft, dright, dtop, dbottom;
 827   int minx, maxx, miny, maxy;
 828   GdkRectangle rect;
 829
 830   dleft = Vx (left);
 831   dright = Vx (right);
 832   dtop = Vy (top);
 833   dbottom = Vy (bottom);
 834
 835   minx = MIN (dleft, dright);
 836   maxx = MAX (dleft, dright);
 837   miny = MIN (dtop, dbottom);
 838   maxy = MAX (dtop, dbottom);
 839
 840   rect.x = minx;
 841   rect.y = miny;
 842   rect.width = maxx - minx;
 843   rect.height = maxy - miny;
 844
 845   redraw_region (&rect);
 846   ghid_screen_update ();
 847 }
 848
 849
 850 void
 851 ghid_invalidate_all ()
 852 {
 853   redraw_region (NULL);
 854   ghid_screen_update ();
 855 }
 856
 857 void
 858 ghid_notify_crosshair_change (bool changes_complete)
 859 {
 860   render_priv *priv = gport->render_priv;
 861
 862   /* We sometimes get called before the GUI is up */
 863   if (gport->drawing_area == NULL)
 864     return;
 865
 866   if (changes_complete)
 867     priv->attached_invalidate_depth --;
 868
 869   if (priv->attached_invalidate_depth < 0)
 870     {
 871       priv->attached_invalidate_depth = 0;
 872       /* A mismatch of changes_complete == false and == true notifications
 873        * is not expected to occur, but we will try to handle it gracefully.
 874        * As we know the crosshair will have been shown already, we must
 875        * repaint the entire view to be sure not to leave an artaefact.
 876        */
 877       ghid_invalidate_all ();
 878       return;
 879     }
 880
 881   if (priv->attached_invalidate_depth == 0)
 882     DrawAttached (priv->crosshair_gc);
 883
 884   if (!changes_complete)
 885     {
 886       priv->attached_invalidate_depth ++;
 887     }
 888   else if (gport->drawing_area != NULL)
 889     {
 890       /* Queue a GTK expose when changes are complete */
 891       ghid_draw_area_update (gport, NULL);
 892     }
 893 }
 894
 895 void
 896 ghid_notify_mark_change (bool changes_complete)
 897 {
 898   render_priv *priv = gport->render_priv;
 899
 900   /* We sometimes get called before the GUI is up */
 901   if (gport->drawing_area == NULL)
 902     return;
 903
 904   if (changes_complete)
 905     priv->mark_invalidate_depth --;
 906
 907   if (priv->mark_invalidate_depth < 0)
 908     {
 909       priv->mark_invalidate_depth = 0;
 910       /* A mismatch of changes_complete == false and == true notifications
 911        * is not expected to occur, but we will try to handle it gracefully.
 912        * As we know the mark will have been shown already, we must
 913        * repaint the entire view to be sure not to leave an artaefact.
 914        */
 915       ghid_invalidate_all ();
 916       return;
 917     }
 918
 919   if (priv->mark_invalidate_depth == 0)
 920     DrawMark (priv->crosshair_gc);
 921
 922   if (!changes_complete)
 923     {
 924       priv->mark_invalidate_depth ++;
 925     }
 926   else if (gport->drawing_area != NULL)
 927     {
 928       /* Queue a GTK expose when changes are complete */
 929       ghid_draw_area_update (gport, NULL);
 930     }
 931 }
 932
 933 static void
 934 draw_right_cross (GdkGC *xor_gc, gint x, gint y)
 935 {
 936   GdkWindow *window = gtk_widget_get_window (gport->drawing_area);
 937
 938   gdk_draw_line (window, xor_gc, x, 0, x, gport->height);
 939   gdk_draw_line (window, xor_gc, 0, y, gport->width, y);
 940 }
 941
 942 static void
 943 draw_slanted_cross (GdkGC *xor_gc, gint x, gint y)
 944 {
 945   GdkWindow *window = gtk_widget_get_window (gport->drawing_area);
 946   gint x0, y0, x1, y1;
 947
 948   x0 = x + (gport->height - y);
 949   x0 = MAX(0, MIN (x0, gport->width));
 950   x1 = x - y;
 951   x1 = MAX(0, MIN (x1, gport->width));
 952   y0 = y + (gport->width - x);
 953   y0 = MAX(0, MIN (y0, gport->height));
 954   y1 = y - x;
 955   y1 = MAX(0, MIN (y1, gport->height));
 956   gdk_draw_line (window, xor_gc, x0, y0, x1, y1);
 957
 958   x0 = x - (gport->height - y);
 959   x0 = MAX(0, MIN (x0, gport->width));
 960   x1 = x + y;
 961   x1 = MAX(0, MIN (x1, gport->width));
 962   y0 = y + x;
 963   y0 = MAX(0, MIN (y0, gport->height));
 964   y1 = y - (gport->width - x);
 965   y1 = MAX(0, MIN (y1, gport->height));
 966   gdk_draw_line (window, xor_gc, x0, y0, x1, y1);
 967 }
 968
 969 static void
 970 draw_dozen_cross (GdkGC *xor_gc, gint x, gint y)
 971 {
 972   GdkWindow *window = gtk_widget_get_window (gport->drawing_area);
 973   gint x0, y0, x1, y1;
 974   gdouble tan60 = sqrt (3);
 975
 976   x0 = x + (gport->height - y) / tan60;
 977   x0 = MAX(0, MIN (x0, gport->width));
 978   x1 = x - y / tan60;
 979   x1 = MAX(0, MIN (x1, gport->width));
 980   y0 = y + (gport->width - x) * tan60;
 981   y0 = MAX(0, MIN (y0, gport->height));
 982   y1 = y - x * tan60;
 983   y1 = MAX(0, MIN (y1, gport->height));
 984   gdk_draw_line (window, xor_gc, x0, y0, x1, y1);
 985
 986   x0 = x + (gport->height - y) * tan60;
 987   x0 = MAX(0, MIN (x0, gport->width));
 988   x1 = x - y * tan60;
 989   x1 = MAX(0, MIN (x1, gport->width));
 990   y0 = y + (gport->width - x) / tan60;
 991   y0 = MAX(0, MIN (y0, gport->height));
 992   y1 = y - x / tan60;
 993   y1 = MAX(0, MIN (y1, gport->height));
 994   gdk_draw_line (window, xor_gc, x0, y0, x1, y1);
 995
 996   x0 = x - (gport->height - y) / tan60;
 997   x0 = MAX(0, MIN (x0, gport->width));
 998   x1 = x + y / tan60;
 999   x1 = MAX(0, MIN (x1, gport->width));
1000   y0 = y + x * tan60;
1001   y0 = MAX(0, MIN (y0, gport->height));
1002   y1 = y - (gport->width - x) * tan60;
1003   y1 = MAX(0, MIN (y1, gport->height));
1004   gdk_draw_line (window, xor_gc, x0, y0, x1, y1);
1005
1006   x0 = x - (gport->height - y) * tan60;
1007   x0 = MAX(0, MIN (x0, gport->width));
1008   x1 = x + y * tan60;
1009   x1 = MAX(0, MIN (x1, gport->width));
1010   y0 = y + x / tan60;
1011   y0 = MAX(0, MIN (y0, gport->height));
1012   y1 = y - (gport->width - x) / tan60;
1013   y1 = MAX(0, MIN (y1, gport->height));
1014   gdk_draw_line (window, xor_gc, x0, y0, x1, y1);
1015 }
1016
1017 static void
1018 draw_crosshair (render_priv *priv)
1019 {
1020   GdkWindow *window = gtk_widget_get_window (gport->drawing_area);
1021   GtkStyle *style = gtk_widget_get_style (gport->drawing_area);
1022   gint x, y;
1023   static GdkGC *xor_gc;
1024   static GdkColor cross_color;
1025
1026   if (gport->crosshair_x < 0 || ghidgui->creating || !gport->has_entered)
1027     return;
1028
1029   if (!xor_gc)
1030     {
1031       xor_gc = gdk_gc_new (window);
1032       gdk_gc_copy (xor_gc, style->white_gc);
1033       gdk_gc_set_function (xor_gc, GDK_XOR);
1034       gdk_gc_set_clip_origin (xor_gc, 0, 0);
1035       set_clip (priv, xor_gc);
1036       /* FIXME: when CrossColor changed from config */
1037       ghid_map_color_string (Settings.CrossColor, &cross_color);
1038     }
1039
1040   gdk_gc_set_foreground (xor_gc, &cross_color);
1041
1042   x = DRAW_X (gport->crosshair_x);
1043   y = DRAW_Y (gport->crosshair_y);
1044
1045   draw_right_cross (xor_gc, x, y);
1046   if (Crosshair.shape == Union_Jack_Crosshair_Shape)
1047     draw_slanted_cross (xor_gc, x, y);
1048   if (Crosshair.shape == Dozen_Crosshair_Shape)
1049     draw_dozen_cross (xor_gc, x, y);
1050 }
1051
1052 void
1053 ghid_init_renderer (int *argc, char ***argv, GHidPort *port)
1054 {
1055   /* Init any GC's required */
1056   port->render_priv = g_new0 (render_priv, 1);
1057   port->render_priv->crosshair_gc = hid_draw_make_gc (&ghid_graphics);
1058 }
1059
1060 void
1061 ghid_shutdown_renderer (GHidPort *port)
1062 {
1063   render_priv *priv = port->render_priv;
1064
1065   hid_draw_destroy_gc (priv->crosshair_gc);
1066   ghid_cancel_lead_user ();
1067   g_free (port->render_priv);
1068   port->render_priv = NULL;
1069 }
1070
1071 void
1072 ghid_init_drawing_widget (GtkWidget *widget, GHidPort *port)
1073 {
1074 }
1075
1076 void
1077 ghid_drawing_area_configure_hook (GHidPort *port)
1078 {
1079   static int done_once = 0;
1080   render_priv *priv = port->render_priv;
1081
1082   if (!done_once)
1083     {
1084       priv->bg_gc = gdk_gc_new (port->drawable);
1085       gdk_gc_set_foreground (priv->bg_gc, &port->bg_color);
1086       gdk_gc_set_clip_origin (priv->bg_gc, 0, 0);
1087
1088       priv->offlimits_gc = gdk_gc_new (port->drawable);
1089       gdk_gc_set_foreground (priv->offlimits_gc, &port->offlimits_color);
1090       gdk_gc_set_clip_origin (priv->offlimits_gc, 0, 0);
1091       done_once = 1;
1092     }
1093
1094   if (port->mask)
1095     {
1096       g_object_unref (port->mask);
1097       port->mask = gdk_pixmap_new (0, port->width, port->height, 1);
1098     }
1099 }
1100
1101 void
1102 ghid_screen_update (void)
1103 {
1104   render_priv *priv = gport->render_priv;
1105   GdkWindow *window = gtk_widget_get_window (gport->drawing_area);
1106
1107   if (gport->pixmap == NULL)
1108     return;
1109
1110   gdk_draw_drawable (window, priv->bg_gc, gport->pixmap,
1111                      0, 0, 0, 0, gport->width, gport->height);
1112   draw_crosshair (priv);
1113 }
1114
1115 gboolean
1116 ghid_drawing_area_expose_cb (GtkWidget *widget,
1117                              GdkEventExpose *ev,
1118                              GHidPort *port)
1119 {
1120   render_priv *priv = port->render_priv;
1121   GdkWindow *window = gtk_widget_get_window (gport->drawing_area);
1122
1123   gdk_draw_drawable (window, priv->bg_gc, port->pixmap,
1124                      ev->area.x, ev->area.y, ev->area.x, ev->area.y,
1125                      ev->area.width, ev->area.height);
1126   draw_crosshair (priv);
1127   return FALSE;
1128 }
1129
1130 void
1131 ghid_port_drawing_realize_cb (GtkWidget *widget, gpointer data)
1132 {
1133 }
1134
1135 gboolean
1136 ghid_pinout_preview_expose (GtkWidget *widget,
1137                             GdkEventExpose *ev)
1138 {
1139   GhidPinoutPreview *pinout = GHID_PINOUT_PREVIEW (widget);
1140   GdkWindow *window = gtk_widget_get_window (widget);
1141   GdkDrawable *save_drawable;
1142   GtkAllocation allocation;
1143   view_data save_view;
1144   int save_width, save_height;
1145   Coord save_max_width;
1146   Coord save_max_height;
1147   double xz, yz;
1148   render_priv *priv = gport->render_priv;
1149
1150   /* Setup drawable and zoom factor for drawing routines
1151    */
1152   save_drawable = gport->drawable;
1153   save_view = gport->view;
1154   save_width = gport->width;
1155   save_height = gport->height;
1156   save_max_width = PCB->MaxWidth;
1157   save_max_height = PCB->MaxHeight;
1158
1159   gtk_widget_get_allocation (widget, &allocation);
1160   xz = (double) pinout->x_max / allocation.width;
1161   yz = (double) pinout->y_max / allocation.height;
1162   if (xz > yz)
1163     gport->view.coord_per_px = xz;
1164   else
1165     gport->view.coord_per_px = yz;
1166
1167   gport->drawable = window;
1168   gport->width = allocation.width;
1169   gport->height = allocation.height;
1170   gport->view.width = allocation.width * gport->view.coord_per_px;
1171   gport->view.height = allocation.height * gport->view.coord_per_px;
1172   gport->view.x0 = (pinout->x_max - gport->view.width) / 2;
1173   gport->view.y0 = (pinout->y_max - gport->view.height) / 2;
1174   PCB->MaxWidth =  pinout->x_max;
1175   PCB->MaxHeight = pinout->y_max;
1176
1177   /* clear background */
1178   gdk_draw_rectangle (window, priv->bg_gc, TRUE,
1179                       0, 0, allocation.width, allocation.height);
1180
1181   /* call the drawing routine */
1182   hid_expose_callback (&ghid_hid, NULL, pinout->element);
1183
1184   gport->drawable = save_drawable;
1185   gport->view = save_view;
1186   gport->width = save_width;
1187   gport->height = save_height;
1188   PCB->MaxWidth = save_max_width;
1189   PCB->MaxHeight = save_max_height;
1190
1191   return FALSE;
1192 }
1193
1194 GdkPixmap *
1195 ghid_render_pixmap (int cx, int cy, double zoom, int width, int height, int depth)
1196 {
1197   GdkPixmap *pixmap;
1198   GdkDrawable *save_drawable;
1199   view_data save_view;
1200   int save_width, save_height;
1201   BoxType region;
1202   render_priv *priv = gport->render_priv;
1203
1204   save_drawable = gport->drawable;
1205   save_view = gport->view;
1206   save_width = gport->width;
1207   save_height = gport->height;
1208
1209   pixmap = gdk_pixmap_new (NULL, width, height, depth);
1210
1211   /* Setup drawable and zoom factor for drawing routines
1212    */
1213
1214   gport->drawable = pixmap;
1215   gport->view.coord_per_px = zoom;
1216   gport->width = width;
1217   gport->height = height;
1218   gport->view.width = width * gport->view.coord_per_px;
1219   gport->view.height = height * gport->view.coord_per_px;
1220   gport->view.x0 = gport->view.flip_x ? PCB->MaxWidth - cx : cx;
1221   gport->view.x0 -= gport->view.height / 2;
1222   gport->view.y0 = gport->view.flip_y ? PCB->MaxHeight - cy : cy;
1223   gport->view.y0 -= gport->view.width  / 2;
1224
1225   /* clear background */
1226   gdk_draw_rectangle (pixmap, priv->bg_gc, TRUE, 0, 0, width, height);
1227
1228   /* call the drawing routine */
1229   region.X1 = MIN(Px(0), Px(gport->width + 1));
1230   region.Y1 = MIN(Py(0), Py(gport->height + 1));
1231   region.X2 = MAX(Px(0), Px(gport->width + 1));
1232   region.Y2 = MAX(Py(0), Py(gport->height + 1));
1233
1234   region.X1 = MAX (0, MIN (PCB->MaxWidth,  region.X1));
1235   region.X2 = MAX (0, MIN (PCB->MaxWidth,  region.X2));
1236   region.Y1 = MAX (0, MIN (PCB->MaxHeight, region.Y1));
1237   region.Y2 = MAX (0, MIN (PCB->MaxHeight, region.Y2));
1238
1239   hid_expose_callback (&ghid_hid, &region, NULL);
1240
1241   gport->drawable = save_drawable;
1242   gport->view = save_view;
1243   gport->width = save_width;
1244   gport->height = save_height;
1245
1246   return pixmap;
1247 }
1248
1249 HID_DRAW *
1250 ghid_request_debug_draw (void)
1251 {
1252   /* No special setup requirements, drawing goes into
1253    * the backing pixmap. */
1254   return ghid_hid.graphics;
1255 }
1256
1257 void
1258 ghid_flush_debug_draw (void)
1259 {
1260   ghid_screen_update ();
1261   gdk_flush ();
1262 }
1263
1264 void
1265 ghid_finish_debug_draw (void)
1266 {
1267   ghid_flush_debug_draw ();
1268   /* No special tear down requirements
1269    */
1270 }
1271
1272 bool
1273 ghid_event_to_pcb_coords (int event_x, int event_y, Coord *pcb_x, Coord *pcb_y)
1274 {
1275   *pcb_x = EVENT_TO_PCB_X (event_x);
1276   *pcb_y = EVENT_TO_PCB_Y (event_y);
1277
1278   return true;
1279 }
1280
1281 bool
1282 ghid_pcb_to_event_coords (Coord pcb_x, Coord pcb_y, int *event_x, int *event_y)
1283 {
1284   *event_x = DRAW_X (pcb_x);
1285   *event_y = DRAW_Y (pcb_y);
1286
1287   return true;
1288 }
1289
1290
1291 #define LEAD_USER_WIDTH           0.2          /* millimeters */
1292 #define LEAD_USER_PERIOD          (1000 / 5)   /* 5fps (in ms) */
1293 #define LEAD_USER_VELOCITY        3.           /* millimeters per second */
1294 #define LEAD_USER_ARC_COUNT       3
1295 #define LEAD_USER_ARC_SEPARATION  3.           /* millimeters */
1296 #define LEAD_USER_INITIAL_RADIUS  10.          /* millimetres */
1297 #define LEAD_USER_COLOR_R         1.
1298 #define LEAD_USER_COLOR_G         1.
1299 #define LEAD_USER_COLOR_B         0.
1300
1301 static void
1302 draw_lead_user (render_priv *priv)
1303 {
1304   GdkWindow *window = gtk_widget_get_window (gport->drawing_area);
1305   GtkStyle *style = gtk_widget_get_style (gport->drawing_area);
1306   int i;
1307   Coord radius = priv->lead_user_radius;
1308   Coord width = MM_TO_COORD (LEAD_USER_WIDTH);
1309   Coord separation = MM_TO_COORD (LEAD_USER_ARC_SEPARATION);
1310   static GdkGC *lead_gc = NULL;
1311   GdkColor lead_color;
1312
1313   if (!priv->lead_user)
1314     return;
1315
1316   if (lead_gc == NULL)
1317     {
1318       lead_gc = gdk_gc_new (window);
1319       gdk_gc_copy (lead_gc, style->white_gc);
1320       gdk_gc_set_function (lead_gc, GDK_XOR);
1321       gdk_gc_set_clip_origin (lead_gc, 0, 0);
1322       lead_color.pixel = 0;
1323       lead_color.red   = (int)(65535. * LEAD_USER_COLOR_R);
1324       lead_color.green = (int)(65535. * LEAD_USER_COLOR_G);
1325       lead_color.blue  = (int)(65535. * LEAD_USER_COLOR_B);
1326       gdk_color_alloc (gport->colormap, &lead_color);
1327       gdk_gc_set_foreground (lead_gc, &lead_color);
1328     }
1329
1330   set_clip (priv, lead_gc);
1331   gdk_gc_set_line_attributes (lead_gc, Vz (width),
1332                               GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER);
1333
1334   /* arcs at the approrpriate radii */
1335
1336   for (i = 0; i < LEAD_USER_ARC_COUNT; i++, radius -= separation)
1337     {
1338       if (radius < width)
1339         radius += MM_TO_COORD (LEAD_USER_INITIAL_RADIUS);
1340
1341       /* Draw an arc at radius */
1342       gdk_draw_arc (gport->drawable, lead_gc, FALSE,
1343                     Vx (priv->lead_user_x - radius),
1344                     Vy (priv->lead_user_y - radius),
1345                     Vz (2. * radius), Vz (2. * radius),
1346                     0, 360 * 64);
1347     }
1348 }
1349
1350 gboolean
1351 lead_user_cb (gpointer data)
1352 {
1353   render_priv *priv = data;
1354   Coord step;
1355   double elapsed_time;
1356
1357   /* Queue a redraw */
1358   ghid_invalidate_all ();
1359
1360   /* Update radius */
1361   elapsed_time = g_timer_elapsed (priv->lead_user_timer, NULL);
1362   g_timer_start (priv->lead_user_timer);
1363
1364   step = MM_TO_COORD (LEAD_USER_VELOCITY * elapsed_time);
1365   if (priv->lead_user_radius > step)
1366     priv->lead_user_radius -= step;
1367   else
1368     priv->lead_user_radius = MM_TO_COORD (LEAD_USER_INITIAL_RADIUS);
1369
1370   return TRUE;
1371 }
1372
1373 void
1374 ghid_lead_user_to_location (Coord x, Coord y)
1375 {
1376   render_priv *priv = gport->render_priv;
1377
1378   ghid_cancel_lead_user ();
1379
1380   priv->lead_user = true;
1381   priv->lead_user_x = x;
1382   priv->lead_user_y = y;
1383   priv->lead_user_radius = MM_TO_COORD (LEAD_USER_INITIAL_RADIUS);
1384   priv->lead_user_timeout = g_timeout_add (LEAD_USER_PERIOD, lead_user_cb, priv);
1385   priv->lead_user_timer = g_timer_new ();
1386 }
1387
1388 void
1389 ghid_cancel_lead_user (void)
1390 {
1391   render_priv *priv = gport->render_priv;
1392
1393   if (priv->lead_user_timeout)
1394     g_source_remove (priv->lead_user_timeout);
1395
1396   if (priv->lead_user_timer)
1397     g_timer_destroy (priv->lead_user_timer);
1398
1399   if (priv->lead_user)
1400     ghid_invalidate_all ();
1401
1402   priv->lead_user_timeout = 0;
1403   priv->lead_user_timer = NULL;
1404   priv->lead_user = false;
1405 }