git.cworth.org Git - grrobot/blob - src/grr_board_view.c

   1 /* grr_board_view - GTK+ widget for displaying an rr_board
   2  *
   3  * Copyright © 2003 Carl Worth
   4  *
   5  * Permission to use, copy, modify, distribute, and sell this software
   6  * and its documentation for any purpose is hereby granted without
   7  * fee, provided that the above copyright notice appear in all copies
   8  * and that both that copyright notice and this permission notice
   9  * appear in supporting documentation, and that the name of Carl Worth
  10  * not be used in advertising or publicity pertaining to distribution
  11  * of the software without specific, written prior permission.
  12  * Carl Worth makes no representations about the suitability of this
  13  * software for any purpose.  It is provided "as is" without express
  14  * or implied warranty.
  15  *
  16  * CARL WORTH DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  17  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
  18  * NO EVENT SHALL CARL WORTH BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  19  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
  20  * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
  21  * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  22  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  23  *
  24  * Author: Carl Worth <carl@theworths.org>
  25  */
  26
  27 #include <math.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #include <cairo.h>
  33 #include <xsvg.h>
  34
  35 #include <gtk/gtkmain.h>
  36 #include <gtk/gtksignal.h>
  37 #include <gdk/gdkx.h>
  38
  39 #include "grr_board_view.h"
  40 #include "grr_icon.h"
  41 #include "grr_util.h"
  42
  43 #define SCROLL_DELAY_LENGTH  300
  44 #define GRR_BOARD_VIEW_DEFAULT_SIZE 100
  45
  46 #define GRR_SVG_ASSUMED_WIDTH 32.0
  47 #define GRR_SVG_ASSUMED_HEIGHT 32.0
  48
  49 /* Forward declarations */
  50
  51 static void grr_board_view_class_init               (grr_board_view_class_t    *klass);
  52 static void grr_board_view_init                     (grr_board_view_t         *view);
  53 static void grr_board_view_destroy                  (GtkObject        *object);
  54 static void grr_board_view_realize                  (GtkWidget        *widget);
  55 static void grr_board_view_size_request             (GtkWidget      *widget,
  56                                                      GtkRequisition *requisition);
  57 static void grr_board_view_size_allocate            (GtkWidget     *widget,
  58                                                      GtkAllocation *allocation);
  59 static gint grr_board_view_expose                   (GtkWidget        *widget,
  60                                                      GdkEventExpose   *event);
  61 static gint grr_board_view_button_press             (GtkWidget        *widget,
  62                                                      GdkEventButton   *event);
  63 static gint grr_board_view_button_release           (GtkWidget        *widget,
  64                                                      GdkEventButton   *event);
  65 static gint grr_board_view_motion_notify            (GtkWidget        *widget,
  66                                                      GdkEventMotion   *event);
  67
  68 static void grr_board_view_update_mouse             (grr_board_view_t *view, gint x, gint y);
  69
  70 /* Local data */
  71
  72 static GtkWidgetClass *parent_class = NULL;
  73
  74 GType
  75 grr_board_view_get_type ()
  76 {
  77   static GType view_type = 0;
  78
  79   if (!view_type)
  80     {
  81       static const GTypeInfo view_info =
  82       {
  83         sizeof (grr_board_view_class_t),
  84         NULL,
  85         NULL,
  86         (GClassInitFunc) grr_board_view_class_init,
  87         NULL,
  88         NULL,
  89         sizeof (grr_board_view_t),
  90         0,
  91         (GInstanceInitFunc) grr_board_view_init,
  92       };
  93
  94       view_type = g_type_register_static (GTK_TYPE_WIDGET, "grr_board_view", &view_info, 0);
  95     }
  96
  97   return view_type;
  98 }
  99
 100 static void
 101 grr_board_view_class_init (grr_board_view_class_t *class)
 102 {
 103     GtkObjectClass *object_class;
 104     GtkWidgetClass *widget_class;
 105
 106     object_class = (GtkObjectClass*) class;
 107     widget_class = (GtkWidgetClass*) class;
 108
 109     parent_class = gtk_type_class (gtk_widget_get_type ());
 110
 111     object_class->destroy = grr_board_view_destroy;
 112
 113     widget_class->realize = grr_board_view_realize;
 114     widget_class->expose_event = grr_board_view_expose;
 115     widget_class->size_request = grr_board_view_size_request;
 116     widget_class->size_allocate = grr_board_view_size_allocate;
 117     widget_class->button_press_event = grr_board_view_button_press;
 118     widget_class->button_release_event = grr_board_view_button_release;
 119     widget_class->motion_notify_event = grr_board_view_motion_notify;
 120 }
 121
 122 static void
 123 grr_board_view_init (grr_board_view_t *view)
 124 {
 125     int i;
 126     rr_robot_t robot;
 127     rr_target_t target;
 128
 129     view->board = NULL;
 130     view->client = NULL;
 131
 132     view->button = 0;
 133
 134     view->time = 60.0;
 135     view->drift_correct = 0.0;
 136     view->timer = 0;
 137
 138     view->cell_width = 0;
 139     view->cell_height = 0;
 140
 141     view->cell1_icon = grr_icon_create ("cell1");
 142     view->cell2_icon = grr_icon_create ("cell2");
 143     view->wall_icon = grr_icon_create ("wall");
 144
 145     for (i=0; i < RR_NUM_ROBOTS; i++) {
 146         robot = rr_robot_from_idx (i);
 147         view->robot_icon[i] = grr_icon_create (grr_icon_robot_name (robot));
 148     }
 149
 150     for (i=0; i < RR_NUM_TARGETS; i++) {
 151         target = rr_target_from_idx (i);
 152         view->target_icon[i] = grr_icon_create (grr_icon_target_name (target));
 153     }
 154 }
 155
 156 grr_board_view_t *
 157 grr_board_view_new (rr_board_t *board)
 158 {
 159     grr_board_view_t *view;
 160     int x, y;
 161
 162     view = g_object_new (grr_board_view_get_type (), NULL);
 163
 164     view->board = board;
 165     rr_board_get_size (board, &view->board_width, &view->board_height);
 166
 167     view->damaged = malloc (view->board_height * sizeof (int *));
 168     for (y = 0; y < view->board_height; y++) {
 169         view->damaged[y] = malloc (view->board_width * sizeof (int));
 170         for (x = 0; x< view->board_width; x++) {
 171             view->damaged[y][x] = 1;
 172         }
 173     }
 174
 175     gtk_widget_queue_draw (GTK_WIDGET (view));
 176
 177     return view;
 178 }
 179
 180 void
 181 grr_board_view_set_client (grr_board_view_t *view, rr_client_t *client)
 182 {
 183     g_return_if_fail (view != NULL);
 184
 185     view->client = client;
 186 }
 187
 188 void
 189 grr_board_view_set_active_robot (grr_board_view_t *view, rr_robot_t robot)
 190 {
 191     g_return_if_fail (view != NULL);
 192
 193     view->active_robot = robot;
 194 }
 195
 196 void
 197 grr_board_view_move_active (grr_board_view_t *view, rr_direction_t dir)
 198 {
 199     if (view->client) {
 200         rr_client_move (view->client, view->active_robot, dir);
 201     } else {
 202         rr_board_move (view->board, view->active_robot, dir);
 203         gtk_widget_queue_draw (GTK_WIDGET (view));
 204     }
 205 }
 206
 207 void
 208 grr_board_view_undo (grr_board_view_t *view)
 209 {
 210     if (view->client) {
 211         rr_client_undo (view->client);
 212     } else {
 213         rr_board_undo (view->board);
 214         gtk_widget_queue_draw (GTK_WIDGET (view));
 215     }
 216 }
 217
 218 static void
 219 grr_board_view_destroy (GtkObject *object)
 220 {
 221     grr_board_view_t *view;
 222
 223     g_return_if_fail (object != NULL);
 224     g_return_if_fail (GRR_IS_BOARD_VIEW (object));
 225
 226     view = GRR_BOARD_VIEW (object);
 227
 228     view->board = NULL;
 229     view->client = NULL;
 230
 231     if (GTK_OBJECT_CLASS (parent_class)->destroy)
 232         (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
 233 }
 234
 235 static void
 236 grr_board_view_realize (GtkWidget *widget)
 237 {
 238     grr_board_view_t *view;
 239     GdkWindowAttr attributes;
 240     gint attributes_mask;
 241
 242     g_return_if_fail (widget != NULL);
 243     g_return_if_fail (GRR_IS_BOARD_VIEW (widget));
 244
 245     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 246     view = GRR_BOARD_VIEW (widget);
 247
 248     attributes.x = widget->allocation.x;
 249     attributes.y = widget->allocation.y;
 250     attributes.width = widget->allocation.width;
 251     attributes.height = widget->allocation.height;
 252     attributes.wclass = GDK_INPUT_OUTPUT;
 253     attributes.window_type = GDK_WINDOW_CHILD;
 254     attributes.event_mask = gtk_widget_get_events (widget) |
 255         GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK |
 256         GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK |
 257         GDK_POINTER_MOTION_HINT_MASK;
 258     attributes.visual = gtk_widget_get_visual (widget);
 259     attributes.colormap = gtk_widget_get_colormap (widget);
 260
 261     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 262     widget->window = gdk_window_new (widget->parent->window, &attributes, attributes_mask);
 263
 264     widget->style = gtk_style_attach (widget->style, widget->window);
 265
 266     gdk_window_set_user_data (widget->window, widget);
 267
 268     gtk_style_set_background (widget->style, widget->window, GTK_STATE_ACTIVE);
 269 }
 270
 271 static void
 272 grr_board_view_size_request (GtkWidget      *widget,
 273                        GtkRequisition *requisition)
 274 {
 275     requisition->width = GRR_BOARD_VIEW_DEFAULT_SIZE;
 276     requisition->height = GRR_BOARD_VIEW_DEFAULT_SIZE;
 277 }
 278
 279 static void
 280 grr_board_view_size_allocate (GtkWidget     *widget,
 281                         GtkAllocation *allocation)
 282 {
 283     grr_board_view_t *view;
 284
 285     g_return_if_fail (widget != NULL);
 286     g_return_if_fail (GRR_IS_BOARD_VIEW (widget));
 287     g_return_if_fail (allocation != NULL);
 288
 289     widget->allocation = *allocation;
 290     view = GRR_BOARD_VIEW (widget);
 291
 292     if (GTK_WIDGET_REALIZED (widget)) {
 293         gdk_window_move_resize (widget->window,
 294                                 allocation->x, allocation->y,
 295                                 allocation->width, allocation->height);
 296     }
 297 }
 298
 299 static void
 300 grr_board_view_draw_walls (grr_board_view_t     *view,
 301                            cairo_t              *xrs,
 302                            rr_wall_t            wall)
 303 {
 304     if (wall == RR_WALL_NONE)
 305         return;
 306
 307     if (wall & RR_WALL_ABOVE) {
 308         grr_icon_draw (view->wall_icon, xrs);
 309     }
 310     if (wall & RR_WALL_LEFT) {
 311         cairo_save (xrs);
 312         cairo_rotate (xrs, M_PI_2);
 313         grr_icon_draw (view->wall_icon, xrs);
 314         cairo_restore (xrs);
 315     }
 316     if (wall & RR_WALL_RIGHT) {
 317         cairo_save (xrs);
 318         cairo_translate (xrs, GRR_SVG_ASSUMED_WIDTH, 0);
 319         cairo_rotate (xrs, M_PI_2);
 320         grr_icon_draw (view->wall_icon, xrs);
 321         cairo_restore (xrs);
 322     }
 323     if (wall & RR_WALL_BELOW) {
 324         cairo_save (xrs);
 325         cairo_translate (xrs, 0, GRR_SVG_ASSUMED_HEIGHT);
 326         grr_icon_draw (view->wall_icon, xrs);
 327         cairo_restore (xrs);
 328     }
 329 }
 330
 331 static gint
 332 grr_board_view_expose (GtkWidget      *widget,
 333                        GdkEventExpose *event)
 334 {
 335     grr_board_view_t *view;
 336     rr_board_t *board;
 337     Display *dpy;
 338     Drawable drawable;
 339     cairo_t *xrs;
 340     GdkDrawable *real_drawable;
 341     gint x_off, y_off;
 342     int i, j;
 343     rr_target_t goal_target;
 344     int new_cell_width, new_cell_height;
 345
 346     g_return_val_if_fail (widget != NULL, FALSE);
 347     g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
 348     g_return_val_if_fail (event != NULL, FALSE);
 349
 350     view = GRR_BOARD_VIEW (widget);
 351     board = view->board;
 352
 353     /* Unabstract X from GTK+ */
 354     gdk_window_get_internal_paint_info (widget->window, &real_drawable, &x_off, &y_off);
 355     dpy = gdk_x11_drawable_get_xdisplay (real_drawable);
 356     drawable = gdk_x11_drawable_get_xid (real_drawable);
 357
 358     /* Ignore GTK+ and use Cairo for drawing. */
 359     xrs = cairo_create ();
 360     cairo_set_target_drawable (xrs, dpy, drawable);
 361
 362     new_cell_width = widget->allocation.width / view->board_width;
 363     if (new_cell_width == 0)
 364         new_cell_width = 1;
 365     new_cell_height = widget->allocation.height / view->board_height;
 366     if (new_cell_height == 0)
 367         new_cell_height = 1;
 368
 369     if (new_cell_width != view->cell_width
 370         || new_cell_height != view->cell_height) {
 371         int i;
 372         rr_robot_t robot;
 373         rr_target_t target;
 374
 375         view->cell_width = new_cell_width;
 376         view->cell_height = new_cell_height;
 377
 378         cairo_save (xrs);
 379         cairo_scale (xrs,
 380                  view->cell_width / GRR_SVG_ASSUMED_WIDTH,
 381                  view->cell_height / GRR_SVG_ASSUMED_HEIGHT);
 382
 383         grr_icon_predraw (view->cell1_icon, xrs,
 384                           view->cell_width, view->cell_height);
 385         grr_icon_predraw (view->cell2_icon, xrs,
 386                           view->cell_width, view->cell_height);
 387
 388         grr_icon_predraw (view->wall_icon, xrs,
 389                           view->cell_width, view->cell_height);
 390
 391         for (i=0; i < RR_NUM_ROBOTS; i++) {
 392             robot = rr_robot_from_idx (i);
 393             grr_icon_predraw (view->robot_icon[i], xrs,
 394                               view->cell_width, view->cell_height);
 395         }
 396
 397         for (i=0; i < RR_NUM_TARGETS; i++) {
 398             target = rr_target_from_idx (i);
 399             grr_icon_predraw (view->target_icon[i], xrs,
 400                               view->cell_width, view->cell_height);
 401         }
 402
 403         cairo_restore (xrs);
 404     }
 405
 406     view->cell_width = new_cell_width;
 407     view->cell_height = new_cell_height;
 408
 409     if (event->area.width) {
 410         int x_start, y_start;
 411         int x, y;
 412         int x_stop, y_stop;
 413         grr_board_view_transform_pixel_to_cell (view,
 414                                                 event->area.x, event->area.y,
 415                                                 &x_start, &y_start);
 416         grr_board_view_transform_pixel_to_cell (view,
 417                                                 event->area.x + event->area.width - 1,
 418                                                 event->area.y + event->area.height - 1,
 419                                                 &x_stop, &y_stop);
 420         for (y = y_start; y <= y_stop; y++)
 421             for (x = x_start; x <= x_stop; x++)
 422                 view->damaged[y][x] = 1;
 423     }
 424
 425     if (event->count > 0)
 426         return FALSE;
 427
 428     cairo_translate (xrs, -x_off, -y_off);
 429
 430     view->board_pad_x = (widget->allocation.width - view->board_width * view->cell_width) / 2;
 431     view->board_pad_y = (widget->allocation.height - view->board_height * view->cell_height) / 2;
 432
 433     cairo_translate (xrs, view->board_pad_x, view->board_pad_y);
 434
 435     goal_target = rr_board_get_goal_target (board);
 436
 437     /* Draw cell contents */
 438     for (j=0; j < view->board_height; j++) {
 439         for (i=0; i < view->board_width; i++) {
 440             if (! view->damaged[j][i])
 441                 continue;
 442             rr_cell_t cell = rr_board_get_cell (board, i, j);
 443             rr_target_t target = RR_CELL_GET_TARGET (cell);
 444             rr_robot_t robot = RR_CELL_GET_ROBOT (cell);
 445
 446             cairo_save (xrs);
 447             cairo_translate (xrs, i * view->cell_width, j * view->cell_height);
 448
 449             if ((i+j) % 2 == 0)
 450                 grr_icon_draw_predrawn (view->cell1_icon, xrs);
 451             else
 452                 grr_icon_draw_predrawn (view->cell2_icon, xrs);
 453
 454             if (target) {
 455                 if (target && target != goal_target) {
 456                     cairo_save (xrs);
 457                     cairo_set_alpha (xrs, 0.25);
 458                     grr_icon_draw_predrawn (view->target_icon[rr_target_idx (target)], xrs);
 459                     cairo_restore (xrs);
 460                 } else {
 461                     grr_icon_draw_predrawn (view->target_icon[rr_target_idx (target)], xrs);
 462                 }
 463             }
 464
 465             if (robot)
 466                 grr_icon_draw_predrawn (view->robot_icon[rr_robot_idx (robot)], xrs);
 467
 468             cairo_restore (xrs);
 469         }
 470     }
 471
 472     /* Draw goal target in center of board */
 473     /* XXX: Not a perfect heuristic. Should check for the vacant box too. */
 474     if (view->board_width == 16 && view->board_height == 16) {
 475         cairo_save (xrs);
 476         cairo_translate (xrs,
 477                      (view->board_width / 2 - 1) * view->cell_width,
 478                      (view->board_height / 2 - 1) * view->cell_height);
 479         cairo_scale (xrs,
 480                      2 * view->cell_width / GRR_SVG_ASSUMED_WIDTH,
 481                      2 * view->cell_height / GRR_SVG_ASSUMED_HEIGHT);
 482         cairo_rectangle (xrs, 0, 0, GRR_SVG_ASSUMED_WIDTH, GRR_SVG_ASSUMED_HEIGHT);
 483         cairo_set_rgb_color (xrs, 1, 1, 1);
 484         cairo_fill (xrs);
 485         grr_icon_draw (view->target_icon[rr_target_idx (goal_target)], xrs);
 486         cairo_restore (xrs);
 487
 488         /* Draw clock */
 489         if (view->time < 60.0) {
 490             cairo_save (xrs);
 491             cairo_new_path (xrs);
 492             cairo_move_to (xrs,
 493                            (double) view->board_width / 2 * view->cell_width,
 494                            (double) view->board_height / 2 * view->cell_height);
 495             cairo_arc (xrs,
 496                        (double) view->board_width / 2 * view->cell_width,
 497                        (double) view->board_height / 2 * view->cell_height,
 498                        .9 * view->cell_width,
 499                        - M_PI_2,
 500                        2 * M_PI * (60.0 - view->time) / 60.0 - M_PI_2);
 501             cairo_close_path (xrs);
 502
 503             cairo_set_rgb_color (xrs, 0.0, 0.0, 0.0);
 504             cairo_set_alpha (xrs, 0.5);
 505             cairo_fill (xrs);
 506
 507             cairo_restore (xrs);
 508         }
 509     }
 510
 511     /* Draw walls */
 512     for (j=0; j < view->board_height; j++) {
 513         for (i=0; i < view->board_width; i++) {
 514             if (! view->damaged[j][i])
 515                 continue;
 516             view->damaged[j][i] = 0;
 517             cairo_save (xrs);
 518             cairo_translate (xrs, i * view->cell_width, j * view->cell_height);
 519             cairo_scale (xrs,
 520                      view->cell_width / GRR_SVG_ASSUMED_WIDTH,
 521                      view->cell_height / GRR_SVG_ASSUMED_HEIGHT);
 522             grr_board_view_draw_walls (view, xrs, RR_CELL_GET_WALLS (rr_board_get_cell(board, i, j)));
 523             cairo_restore (xrs);
 524         }
 525     }
 526
 527     cairo_destroy (xrs);
 528
 529     return FALSE;
 530 }
 531
 532 void
 533 grr_board_view_transform_pixel_to_cell (grr_board_view_t *view,
 534                                         int pixel_x, int pixel_y,
 535                                         int *cell_x, int *cell_y)
 536 {
 537     int x, y;
 538     x = (pixel_x - view->board_pad_x) / view->cell_width;
 539     y = (pixel_y - view->board_pad_y) / view->cell_height;
 540     if (x < 0)
 541         x = 0;
 542     if (x >= view->board_width)
 543         x = view->board_width - 1;
 544     if (y < 0)
 545         y = 0;
 546     if (y >= view->board_height)
 547         y = view->board_height - 1;
 548     *cell_x = x;
 549     *cell_y = y;
 550 }
 551
 552 void
 553 grr_board_view_transform_cell_to_pixel (grr_board_view_t *view,
 554                                         int cell_x, int cell_y,
 555                                         int *pixel_x, int *pixel_y)
 556 {
 557     *pixel_x = view->cell_width * cell_x + view->board_pad_x;
 558     *pixel_y = view->cell_height * cell_y + view->board_pad_y;
 559 }
 560
 561 static gint
 562 grr_board_view_button_press (GtkWidget      *widget,
 563                              GdkEventButton *event)
 564 {
 565     grr_board_view_t *view;
 566     rr_cell_t cell;
 567     int x, y;
 568
 569     g_return_val_if_fail (widget != NULL, FALSE);
 570     g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
 571     g_return_val_if_fail (event != NULL, FALSE);
 572
 573     view = GRR_BOARD_VIEW (widget);
 574
 575     grr_board_view_transform_pixel_to_cell (view,
 576                                             event->x, event->y,
 577                                             &x, &y);
 578
 579     cell = rr_board_get_cell (view->board, x, y);
 580     if (!view->button && RR_CELL_GET_ROBOT (cell)) {
 581
 582         gtk_grab_add (widget);
 583
 584         view->button = event->button;
 585         grr_board_view_set_active_robot (view, RR_CELL_GET_ROBOT (cell));
 586
 587         grr_board_view_update_mouse (view, event->x, event->y);
 588     }
 589
 590     return FALSE;
 591 }
 592
 593 static gint
 594 grr_board_view_button_release (GtkWidget      *widget,
 595                                GdkEventButton *event)
 596 {
 597     grr_board_view_t *view;
 598     rr_direction_t dir;
 599     int x, y;
 600     int robot_x, robot_y;
 601     int dx, dy;
 602
 603     g_return_val_if_fail (widget != NULL, FALSE);
 604     g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
 605     g_return_val_if_fail (event != NULL, FALSE);
 606
 607     view = GRR_BOARD_VIEW (widget);
 608
 609     if (view->button == event->button) {
 610       gtk_grab_remove (widget);
 611       view->button = 0;
 612     }
 613
 614     grr_board_view_transform_pixel_to_cell (view, event->x, event->y, &x, &y);
 615
 616     rr_board_find_robot (view->board, view->active_robot, &robot_x, &robot_y);
 617     dx = x - robot_x;
 618     dy = y - robot_y;
 619     if (dx == 0 && dy == 0)
 620         return FALSE;
 621
 622     if (abs(dx) > abs(dy))
 623         if (x > robot_x)
 624             dir = RR_DIRECTION_EAST;
 625         else
 626             dir = RR_DIRECTION_WEST;
 627     else
 628         if (y > robot_y)
 629             dir = RR_DIRECTION_SOUTH;
 630         else
 631             dir = RR_DIRECTION_NORTH;
 632
 633     grr_board_view_move_active (view, dir);
 634
 635     return FALSE;
 636 }
 637
 638 static gint
 639 grr_board_view_motion_notify (GtkWidget      *widget,
 640                          GdkEventMotion *event)
 641 {
 642     grr_board_view_t *view;
 643     GdkModifierType mods;
 644     gint x, y, mask;
 645
 646     g_return_val_if_fail (widget != NULL, FALSE);
 647     g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
 648     g_return_val_if_fail (event != NULL, FALSE);
 649
 650     view = GRR_BOARD_VIEW (widget);
 651
 652     if (view->button != 0) {
 653         x = event->x;
 654         y = event->y;
 655
 656         if (event->is_hint || (event->window != widget->window))
 657             gdk_window_get_pointer (widget->window, &x, &y, &mods);
 658
 659         switch (view->button) {
 660         case 1:
 661             mask = GDK_BUTTON1_MASK;
 662             break;
 663         case 2:
 664             mask = GDK_BUTTON2_MASK;
 665             break;
 666         case 3:
 667             mask = GDK_BUTTON3_MASK;
 668             break;
 669         default:
 670             mask = 0;
 671             break;
 672         }
 673
 674         if (mods & mask)
 675             grr_board_view_update_mouse (view, x,y);
 676     }
 677
 678     return FALSE;
 679 }
 680
 681 static void
 682 grr_board_view_update_mouse (grr_board_view_t *view, gint x, gint y)
 683 {
 684     g_return_if_fail (view != NULL);
 685     g_return_if_fail (GRR_IS_BOARD_VIEW (view));
 686
 687     /* XXX: Perhaps should draw a robot here */
 688 }
 689
 690 void
 691 grr_board_view_mark_damage (grr_board_view_t *view, int i, int j)
 692 {
 693     int x, y;
 694
 695     grr_board_view_transform_cell_to_pixel (view, i, j, &x, &y);
 696     gtk_widget_queue_draw_area (GTK_WIDGET (view), x, y, view->cell_width, view->cell_height);
 697 }
 698
 699 #define TIMER_INTERVAL_MS 100
 700
 701 static void
 702 grr_board_view_refresh_timer (grr_board_view_t *view)
 703 {
 704     int x, y;
 705
 706     grr_board_view_transform_cell_to_pixel (view,
 707                                             view->board_width / 2 - 1,
 708                                             view->board_height / 2 -1,
 709                                             &x, &y);
 710     gtk_widget_queue_draw_area (GTK_WIDGET (view),
 711                                 x, y,
 712                                 2 * view->cell_width,
 713                                 2 * view->cell_height);
 714 }
 715
 716 static gboolean
 717 grr_board_view_decrement_timer (void *widget)
 718 {
 719     grr_board_view_t *view = widget;
 720
 721     view->time -= TIMER_INTERVAL_MS / 1000.0;
 722     view->time += view->drift_correct;
 723
 724     grr_board_view_refresh_timer (view);
 725
 726     return TRUE;
 727 }
 728
 729 void
 730 grr_board_view_start_timer (grr_board_view_t *view, double time)
 731 {
 732     /* XXX: It would be good to adjust the clock for latency somewhere... */
 733     /* Correct any drift within the next 10 seconds, or half the
 734        remaining time --- whichever is less. */
 735     if (view->timer) {
 736         double correction_time;
 737         if (time >= 20.0)
 738             correction_time = 10.0;
 739         else
 740             correction_time = time / 2.0;
 741         view->drift_correct = (time - view->time) / (correction_time * TIMER_INTERVAL_MS);
 742     } else {
 743         view->time = time;
 744
 745         view->timer = gtk_timeout_add (TIMER_INTERVAL_MS, grr_board_view_decrement_timer, view);
 746     }
 747 }
 748
 749 void
 750 grr_board_view_stop_timer (grr_board_view_t *view)
 751 {
 752     if (view->timer == 0)
 753         return;
 754
 755     gtk_timeout_remove (view->timer);
 756     view->timer = 0;
 757     view->time = 0.0;
 758
 759     grr_board_view_refresh_timer (view);
 760 }
 761
 762 void
 763 grr_board_view_reset_timer (grr_board_view_t *view)
 764 {
 765     grr_board_view_stop_timer (view);
 766
 767     view->time = 60.0;
 768     view->drift_correct = 0.0;
 769 }