]> git.cworth.org Git - grrobot/blobdiff - src/grr_board_view.c
* configure.in:
[grrobot] / src / grr_board_view.c
index eaa4db4fa48979ae3442c468170dad2cef8e3801..1c918f2a23744594ad850227890edcdaeff17fe9 100644 (file)
  * Author: Carl Worth <carl@theworths.org>
  */
 
-#include <Xr.h>
-#include <xsvg.h>
-
 #include <math.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <cairo.h>
+#include <svg-cairo.h>
+
 #include <gtk/gtkmain.h>
 #include <gtk/gtksignal.h>
 #include <gdk/gdkx.h>
 
 #include "grr_board_view.h"
+#include "grr_icon.h"
+#include "grr_util.h"
 
 #define SCROLL_DELAY_LENGTH  300
 #define GRR_BOARD_VIEW_DEFAULT_SIZE 100
 #define GRR_SVG_ASSUMED_WIDTH 32.0
 #define GRR_SVG_ASSUMED_HEIGHT 32.0
 
-#define GRR_CELL_SVG "svg/cell.svg"
-#define GRR_WALL_SVG "svg/wall.svg"
-
-#define GRR_ROBOT_BLUE_SVG "svg/robot_blue.svg"
-#define GRR_ROBOT_GREEN_SVG "svg/robot_green.svg"
-#define GRR_ROBOT_RED_SVG "svg/robot_red.svg"
-#define GRR_ROBOT_YELLOW_SVG "svg/robot_yellow.svg"
-
-#define GRR_TARGET_BLUE_CIRCLE_SVG "svg/target_blue_circle.svg"
-#define GRR_TARGET_BLUE_OCTAGON_SVG "svg/target_blue_octagon.svg"
-#define GRR_TARGET_BLUE_SQUARE_SVG "svg/target_blue_square.svg"
-#define GRR_TARGET_BLUE_TRIANGLE_SVG "svg/target_blue_triangle.svg"
-
-#define GRR_TARGET_GREEN_CIRCLE_SVG "svg/target_green_circle.svg"
-#define GRR_TARGET_GREEN_OCTAGON_SVG "svg/target_green_octagon.svg"
-#define GRR_TARGET_GREEN_SQUARE_SVG "svg/target_green_square.svg"
-#define GRR_TARGET_GREEN_TRIANGLE_SVG "svg/target_green_triangle.svg"
-
-#define GRR_TARGET_RED_CIRCLE_SVG "svg/target_red_circle.svg"
-#define GRR_TARGET_RED_OCTAGON_SVG "svg/target_red_octagon.svg"
-#define GRR_TARGET_RED_SQUARE_SVG "svg/target_red_square.svg"
-#define GRR_TARGET_RED_TRIANGLE_SVG "svg/target_red_triangle.svg"
-
-#define GRR_TARGET_YELLOW_CIRCLE_SVG "svg/target_yellow_circle.svg"
-#define GRR_TARGET_YELLOW_OCTAGON_SVG "svg/target_yellow_octagon.svg"
-#define GRR_TARGET_YELLOW_SQUARE_SVG "svg/target_yellow_square.svg"
-#define GRR_TARGET_YELLOW_TRIANGLE_SVG "svg/target_yellow_triangle.svg"
-
-#define GRR_TARGET_WHIRL_SVG "svg/target_whirl.svg"
-
-
 /* Forward declarations */
 
 static void grr_board_view_class_init               (grr_board_view_class_t    *klass);
@@ -79,21 +53,19 @@ static void grr_board_view_init                     (grr_board_view_t         *v
 static void grr_board_view_destroy                  (GtkObject        *object);
 static void grr_board_view_realize                  (GtkWidget        *widget);
 static void grr_board_view_size_request             (GtkWidget      *widget,
-                                              GtkRequisition *requisition);
+                                                    GtkRequisition *requisition);
 static void grr_board_view_size_allocate            (GtkWidget     *widget,
-                                              GtkAllocation *allocation);
+                                                    GtkAllocation *allocation);
 static gint grr_board_view_expose                   (GtkWidget        *widget,
-                                               GdkEventExpose   *event);
+                                                    GdkEventExpose   *event);
 static gint grr_board_view_button_press             (GtkWidget        *widget,
-                                               GdkEventButton   *event);
+                                                    GdkEventButton   *event);
 static gint grr_board_view_button_release           (GtkWidget        *widget,
-                                               GdkEventButton   *event);
+                                                    GdkEventButton   *event);
 static gint grr_board_view_motion_notify            (GtkWidget        *widget,
-                                               GdkEventMotion   *event);
-static gint grr_board_view_timer                    (grr_board_view_t         *view);
+                                                    GdkEventMotion   *event);
 
 static void grr_board_view_update_mouse             (grr_board_view_t *view, gint x, gint y);
-static void grr_board_view_update                   (grr_board_view_t *view);
 
 /* Local data */
 
@@ -128,651 +100,692 @@ grr_board_view_get_type ()
 static void
 grr_board_view_class_init (grr_board_view_class_t *class)
 {
-  GtkObjectClass *object_class;
-  GtkWidgetClass *widget_class;
+    GtkObjectClass *object_class;
+    GtkWidgetClass *widget_class;
 
-  object_class = (GtkObjectClass*) class;
-  widget_class = (GtkWidgetClass*) class;
+    object_class = (GtkObjectClass*) class;
+    widget_class = (GtkWidgetClass*) class;
 
-  parent_class = gtk_type_class (gtk_widget_get_type ());
+    parent_class = gtk_type_class (gtk_widget_get_type ());
 
-  object_class->destroy = grr_board_view_destroy;
+    object_class->destroy = grr_board_view_destroy;
 
-  widget_class->realize = grr_board_view_realize;
-  widget_class->expose_event = grr_board_view_expose;
-  widget_class->size_request = grr_board_view_size_request;
-  widget_class->size_allocate = grr_board_view_size_allocate;
-  widget_class->button_press_event = grr_board_view_button_press;
-  widget_class->button_release_event = grr_board_view_button_release;
-  widget_class->motion_notify_event = grr_board_view_motion_notify;
+    widget_class->realize = grr_board_view_realize;
+    widget_class->expose_event = grr_board_view_expose;
+    widget_class->size_request = grr_board_view_size_request;
+    widget_class->size_allocate = grr_board_view_size_allocate;
+    widget_class->button_press_event = grr_board_view_button_press;
+    widget_class->button_release_event = grr_board_view_button_release;
+    widget_class->motion_notify_event = grr_board_view_motion_notify;
 }
 
 static void
 grr_board_view_init (grr_board_view_t *view)
 {
+    int i;
+    rr_robot_t robot;
+    rr_target_t target;
+
     view->board = NULL;
-    view->owns_board = 0;
+    view->client = NULL;
     
     view->button = 0;
-    view->policy = GTK_UPDATE_CONTINUOUS;
+
+    view->time = 60.0;
+    view->drift_correct = 0.0;
     view->timer = 0;
-    view->radius = 0;
-    view->pointer_width = 0;
-    view->angle = 0.0;
-    view->old_value = 0.0;
-    view->old_lower = 0.0;
-    view->old_upper = 0.0;
+    view->zap_time = 0.0;
+
+    view->cell_width = 0;
+    view->cell_height = 0;
+
+    view->cell1_icon = grr_icon_create ("cell1");
+    view->cell2_icon = grr_icon_create ("cell2");
+    view->wall_icon = grr_icon_create ("wall");
+
+    for (i=0; i < RR_NUM_ROBOTS; i++) {
+       robot = rr_robot_from_idx (i);
+       view->robot_icon[i] = grr_icon_create (grr_icon_robot_name (robot));
+    }
+
+    for (i=0; i < RR_NUM_TARGETS; i++) {
+       target = rr_target_from_idx (i);
+       view->target_icon[i] = grr_icon_create (grr_icon_target_name (target));
+    }
 }
 
-GtkWidget*
+grr_board_view_t *
 grr_board_view_new (rr_board_t *board)
 {
     grr_board_view_t *view;
+    int x, y;
     
     view = g_object_new (grr_board_view_get_type (), NULL);
 
-    if (board == NULL) {
-       board = rr_board_create (16, 16);
-       view->owns_board = 1;
+    view->board = board;
+    rr_board_get_size (board, &view->board_width, &view->board_height);
+
+    view->damaged = malloc (view->board_height * sizeof (int *));
+    for (y = 0; y < view->board_height; y++) {
+       view->damaged[y] = malloc (view->board_width * sizeof (int));
+       for (x = 0; x< view->board_width; x++) {
+           view->damaged[y][x] = 1;
+       }
     }
 
-    grr_board_view_set_board (view, board);
+    gtk_widget_queue_draw (GTK_WIDGET (view));
 
-    return GTK_WIDGET (view);
+    return view;
 }
 
-static void
-grr_board_view_destroy (GtkObject *object)
+void
+grr_board_view_set_client (grr_board_view_t *view, rr_client_t *client)
 {
-    grr_board_view_t *view;
+    g_return_if_fail (view != NULL);
 
-    g_return_if_fail (object != NULL);
-    g_return_if_fail (GRR_IS_BOARD_VIEW (object));
+    view->client = client;
+}
 
-    view = GRR_BOARD_VIEW (object);
+void
+grr_board_view_set_active_robot (grr_board_view_t *view, rr_robot_t robot)
+{
+    g_return_if_fail (view != NULL);
 
-    rr_board_destroy (view->board);
+    view->active_robot = robot;
+}
 
-    if (view->board && view->owns_board) {
-       rr_board_destroy (view->board);
-       view->board = NULL;
+void
+grr_board_view_move_active (grr_board_view_t *view, rr_direction_t dir)
+{
+    if (view->client) {
+       rr_client_move (view->client, view->active_robot, dir);
+    } else {
+       rr_board_move (view->board, view->active_robot, dir);
+       gtk_widget_queue_draw (GTK_WIDGET (view));
     }
-    
-    if (GTK_OBJECT_CLASS (parent_class)->destroy)
-       (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
 }
 
 void
-grr_board_view_set_board (grr_board_view_t      *view,
-                         rr_board_t *board)
+grr_board_view_undo (grr_board_view_t *view)
 {
-    g_return_if_fail (view != NULL);
-    g_return_if_fail (GRR_IS_BOARD_VIEW (view));
-
-    view->board = board;
-
-    grr_board_view_update (view);
+    if (view->client) {
+       rr_client_undo (view->client);
+    } else {
+       rr_board_undo (view->board);
+       gtk_widget_queue_draw (GTK_WIDGET (view));
+    }
 }
 
 static void
-grr_board_view_realize (GtkWidget *widget)
+grr_board_view_destroy (GtkObject *object)
 {
-  grr_board_view_t *view;
-  GdkWindowAttr attributes;
-  gint attributes_mask;
+    grr_board_view_t *view;
 
-  g_return_if_fail (widget != NULL);
-  g_return_if_fail (GRR_IS_BOARD_VIEW (widget));
+    g_return_if_fail (object != NULL);
+    g_return_if_fail (GRR_IS_BOARD_VIEW (object));
 
-  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
-  view = GRR_BOARD_VIEW (widget);
+    view = GRR_BOARD_VIEW (object);
 
-  attributes.x = widget->allocation.x;
-  attributes.y = widget->allocation.y;
-  attributes.width = widget->allocation.width;
-  attributes.height = widget->allocation.height;
-  attributes.wclass = GDK_INPUT_OUTPUT;
-  attributes.window_type = GDK_WINDOW_CHILD;
-  attributes.event_mask = gtk_widget_get_events (widget) | 
-    GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK | 
-    GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK |
-    GDK_POINTER_MOTION_HINT_MASK;
-  attributes.visual = gtk_widget_get_visual (widget);
-  attributes.colormap = gtk_widget_get_colormap (widget);
+    view->board = NULL;
+    view->client = NULL;
+    
+    if (GTK_OBJECT_CLASS (parent_class)->destroy)
+       (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
+}
 
-  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
-  widget->window = gdk_window_new (widget->parent->window, &attributes, attributes_mask);
+static void
+grr_board_view_realize (GtkWidget *widget)
+{
+    grr_board_view_t *view;
+    GdkWindowAttr attributes;
+    gint attributes_mask;
 
-  widget->style = gtk_style_attach (widget->style, widget->window);
+    g_return_if_fail (widget != NULL);
+    g_return_if_fail (GRR_IS_BOARD_VIEW (widget));
+  
+    GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
+    view = GRR_BOARD_VIEW (widget);
 
-  gdk_window_set_user_data (widget->window, widget);
+    attributes.x = widget->allocation.x;
+    attributes.y = widget->allocation.y;
+    attributes.width = widget->allocation.width;
+    attributes.height = widget->allocation.height;
+    attributes.wclass = GDK_INPUT_OUTPUT;
+    attributes.window_type = GDK_WINDOW_CHILD;
+    attributes.event_mask = gtk_widget_get_events (widget) | 
+       GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK | 
+       GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK |
+       GDK_POINTER_MOTION_HINT_MASK;
+    attributes.visual = gtk_widget_get_visual (widget);
+    attributes.colormap = gtk_widget_get_colormap (widget);
+    
+    attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
+    widget->window = gdk_window_new (widget->parent->window, &attributes, attributes_mask);
+    
+    widget->style = gtk_style_attach (widget->style, widget->window);
+    
+    gdk_window_set_user_data (widget->window, widget);
 
-  gtk_style_set_background (widget->style, widget->window, GTK_STATE_ACTIVE);
+    gtk_style_set_background (widget->style, widget->window, GTK_STATE_ACTIVE);
 }
 
 static void 
 grr_board_view_size_request (GtkWidget      *widget,
                       GtkRequisition *requisition)
 {
-  requisition->width = GRR_BOARD_VIEW_DEFAULT_SIZE;
-  requisition->height = GRR_BOARD_VIEW_DEFAULT_SIZE;
+    requisition->width = GRR_BOARD_VIEW_DEFAULT_SIZE;
+    requisition->height = GRR_BOARD_VIEW_DEFAULT_SIZE;
 }
 
 static void
 grr_board_view_size_allocate (GtkWidget     *widget,
                        GtkAllocation *allocation)
 {
-  grr_board_view_t *view;
-
-  g_return_if_fail (widget != NULL);
-  g_return_if_fail (GRR_IS_BOARD_VIEW (widget));
-  g_return_if_fail (allocation != NULL);
-
-  widget->allocation = *allocation;
-  view = GRR_BOARD_VIEW (widget);
-
-  if (GTK_WIDGET_REALIZED (widget))
-    {
-
-      gdk_window_move_resize (widget->window,
-                             allocation->x, allocation->y,
-                             allocation->width, allocation->height);
+    grr_board_view_t *view;
 
-    }
-  view->radius = MIN (allocation->width, allocation->height) * 0.45;
-  view->pointer_width = view->radius / 5;
-}
+    g_return_if_fail (widget != NULL);
+    g_return_if_fail (GRR_IS_BOARD_VIEW (widget));
+    g_return_if_fail (allocation != NULL);
 
-static void
-grr_svg_draw (XrState *xrs, char *svg)
-{
-    xsvg_status_t status;
-    xsvg_t *xsvg;
+    widget->allocation = *allocation;
+    view = GRR_BOARD_VIEW (widget);
 
-    status = xsvg_create (&xsvg);
-    if (status) {
-       fprintf (stderr, "xsvg_create error\n");
-       return;
+    if (GTK_WIDGET_REALIZED (widget)) {
+       gdk_window_move_resize (widget->window,
+                               allocation->x, allocation->y,
+                               allocation->width, allocation->height);
     }
-    status = xsvg_parse_file (xsvg, svg);
-    if (status) {
-       fprintf (stderr, "xsvg_parse_file error parsing %s\n", svg);
-       return;
-    }
-    xsvg_render (xsvg, xrs);
-    if (status) {
-       fprintf (stderr, "xsvg_render error\n");
-       return;
-    }
-    xsvg_destroy (xsvg);
 }
 
 static void
-grr_wall_draw (XrState *xrs, rr_wall_t wall)
+grr_board_view_draw_walls (grr_board_view_t    *view,
+                          cairo_t              *xrs,
+                          rr_wall_t            wall)
 {
-    char *wall_svg = GRR_WALL_SVG;
-
     if (wall == RR_WALL_NONE)
        return;
 
     if (wall & RR_WALL_ABOVE) {
-       grr_svg_draw (xrs, wall_svg);
+       grr_icon_draw (view->wall_icon, xrs);
     }
     if (wall & RR_WALL_LEFT) {
-       XrSave (xrs);
-       XrRotate (xrs, M_PI_2);
-       grr_svg_draw (xrs, wall_svg);
-       XrRestore (xrs);
+       cairo_save (xrs);
+       cairo_rotate (xrs, M_PI_2);
+       grr_icon_draw (view->wall_icon, xrs);
+       cairo_restore (xrs);
     }
     if (wall & RR_WALL_RIGHT) {
-       XrSave (xrs);
-       XrTranslate (xrs, GRR_SVG_ASSUMED_WIDTH, 0);
-       XrRotate (xrs, M_PI_2);
-       grr_svg_draw (xrs, wall_svg);
-       XrRestore (xrs);
+       cairo_save (xrs);
+       cairo_translate (xrs, GRR_SVG_ASSUMED_WIDTH, 0);
+       cairo_rotate (xrs, M_PI_2);
+       grr_icon_draw (view->wall_icon, xrs);
+       cairo_restore (xrs);
     }
     if (wall & RR_WALL_BELOW) {
-       XrSave (xrs);
-       XrTranslate (xrs, 0, GRR_SVG_ASSUMED_HEIGHT);
-       grr_svg_draw (xrs, wall_svg);
-       XrRestore (xrs);
+       cairo_save (xrs);
+       cairo_translate (xrs, 0, GRR_SVG_ASSUMED_HEIGHT);
+       grr_icon_draw (view->wall_icon, xrs);
+       cairo_restore (xrs);
     }
 }
 
-static void
-grr_target_draw (XrState *xrs, rr_target_t target)
-{
-    char *target_svg;
-
-    if (target == RR_TARGET_NONE)
-       return;
-
-    switch (target) {
-    case RR_TARGET_BLUE_CIRCLE:
-       target_svg = GRR_TARGET_BLUE_CIRCLE_SVG;
-       break;
-    case RR_TARGET_BLUE_OCTAGON:
-       target_svg = GRR_TARGET_BLUE_OCTAGON_SVG;
-       break;
-    case RR_TARGET_BLUE_SQUARE:
-       target_svg = GRR_TARGET_BLUE_SQUARE_SVG;
-       break;
-    case RR_TARGET_BLUE_TRIANGLE:
-       target_svg = GRR_TARGET_BLUE_TRIANGLE_SVG;
-       break;
-    case RR_TARGET_GREEN_CIRCLE:
-       target_svg = GRR_TARGET_GREEN_CIRCLE_SVG;
-       break;
-    case RR_TARGET_GREEN_OCTAGON:
-       target_svg = GRR_TARGET_GREEN_OCTAGON_SVG;
-       break;
-    case RR_TARGET_GREEN_SQUARE:
-       target_svg = GRR_TARGET_GREEN_SQUARE_SVG;
-       break;
-    case RR_TARGET_GREEN_TRIANGLE:
-       target_svg = GRR_TARGET_GREEN_TRIANGLE_SVG;
-       break;
-    case RR_TARGET_RED_CIRCLE:
-       target_svg = GRR_TARGET_RED_CIRCLE_SVG;
-       break;
-    case RR_TARGET_RED_OCTAGON:
-       target_svg = GRR_TARGET_RED_OCTAGON_SVG;
-       break;
-    case RR_TARGET_RED_SQUARE:
-       target_svg = GRR_TARGET_RED_SQUARE_SVG;
-       break;
-    case RR_TARGET_RED_TRIANGLE:
-       target_svg = GRR_TARGET_RED_TRIANGLE_SVG;
-       break;
-    case RR_TARGET_YELLOW_CIRCLE:
-       target_svg = GRR_TARGET_YELLOW_CIRCLE_SVG;
-       break;
-    case RR_TARGET_YELLOW_OCTAGON:
-       target_svg = GRR_TARGET_YELLOW_OCTAGON_SVG;
-       break;
-    case RR_TARGET_YELLOW_SQUARE:
-       target_svg = GRR_TARGET_YELLOW_SQUARE_SVG;
-       break;
-    case RR_TARGET_YELLOW_TRIANGLE:
-       target_svg = GRR_TARGET_YELLOW_TRIANGLE_SVG;
-       break;
-    case RR_TARGET_WHIRL:
-       target_svg = GRR_TARGET_WHIRL_SVG;
-       break;
-    default:
-       return;
-    }
-
-    grr_svg_draw (xrs, target_svg);
-}
-
-static void
-grr_robot_draw (XrState *xrs, rr_robot_t robot)
-{
-    char *robot_svg;
-
-    if (robot == RR_ROBOT_NONE)
-       return;
-
-    switch (robot) {
-    case RR_ROBOT_BLUE:
-       robot_svg = GRR_ROBOT_BLUE_SVG;
-       break;
-    case RR_ROBOT_GREEN:
-       robot_svg = GRR_ROBOT_GREEN_SVG;
-       break;
-    case RR_ROBOT_RED:
-       robot_svg = GRR_ROBOT_RED_SVG;
-       break;
-    case RR_ROBOT_YELLOW:
-       robot_svg = GRR_ROBOT_YELLOW_SVG;
-       break;
-    default:
-       return;
-    }
-
-    grr_svg_draw (xrs, robot_svg);
-}
-
-static void
-grr_cell_draw (XrState *xrs, rr_cell_t cell, rr_target_t goal,
-              int width, int height)
-{
-    int xpad, ypad;
-    rr_target_t target;
-
-    XrSave (xrs);
-    XrScale (xrs,
-            width / GRR_SVG_ASSUMED_WIDTH,
-            height / GRR_SVG_ASSUMED_HEIGHT);
-    grr_svg_draw (xrs, GRR_CELL_SVG);
-    grr_wall_draw (xrs, RR_CELL_GET_WALLS (cell));
-    XrRestore (xrs);
-
-    xpad = width / 5;
-    ypad = width / 5;
-
-    XrSave (xrs);
-    XrTranslate (xrs, xpad, ypad);
-    XrScale (xrs,
-            (width - 2*xpad)  / GRR_SVG_ASSUMED_WIDTH,
-            (height - 2*ypad) / GRR_SVG_ASSUMED_HEIGHT);
-
-    target = RR_CELL_GET_TARGET (cell);
-    grr_target_draw (xrs, target);
-    XrRestore (xrs);
-
-    /* This is a hack, (it obscures the cell background in addition to
-       the target). The real way to do this is to draw the target
-       itself with less opacity. */
-    if (target && target != goal) {
-       XrSave (xrs);
-       XrScale (xrs,
-                width / GRR_SVG_ASSUMED_WIDTH,
-                height / GRR_SVG_ASSUMED_HEIGHT);
-       XrRectangle (xrs, 0, 0,
-                    GRR_SVG_ASSUMED_WIDTH,
-                    GRR_SVG_ASSUMED_HEIGHT);
-       XrSetRGBColor (xrs, 1, 1, 1);
-       XrSetAlpha (xrs, 0.75);
-       XrFill (xrs);
-       XrRestore (xrs);
-    }
-
-    XrSave (xrs);
-    XrTranslate (xrs, xpad, ypad);
-    XrScale (xrs,
-            (width - 2*xpad)  / GRR_SVG_ASSUMED_WIDTH,
-            (height - 2*ypad) / GRR_SVG_ASSUMED_HEIGHT);
-
-    grr_robot_draw (xrs, RR_CELL_GET_ROBOT (cell));
-
-    XrRestore (xrs);
-
-}
-
 static gint
 grr_board_view_expose (GtkWidget      *widget,
                       GdkEventExpose *event)
 {
     grr_board_view_t *view;
+    rr_board_t *board;
     Display *dpy;
     Drawable drawable;
-    XrState *xrs;
+    cairo_t *xrs;
     GdkDrawable *real_drawable;
     gint x_off, y_off;
     int i, j;
     rr_target_t goal_target;
+    int new_cell_width, new_cell_height;
 
     g_return_val_if_fail (widget != NULL, FALSE);
     g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
     g_return_val_if_fail (event != NULL, FALSE);
 
-    if (event->count > 0)
-       return FALSE;
-
     view = GRR_BOARD_VIEW (widget);
+    board = view->board;
 
     /* Unabstract X from GTK+ */
     gdk_window_get_internal_paint_info (widget->window, &real_drawable, &x_off, &y_off);
     dpy = gdk_x11_drawable_get_xdisplay (real_drawable);
     drawable = gdk_x11_drawable_get_xid (real_drawable);
 
-    /* Ignore GTK+ and use Xr for drawing. */
-    xrs = XrCreate ();
-    XrSetTargetDrawable (xrs, dpy, drawable);
-    XrTranslate (xrs, -x_off, -y_off);
+    /* Ignore GTK+ and use Cairo for drawing. */
+    xrs = cairo_create ();
+    cairo_set_target_drawable (xrs, dpy, drawable);
+
+    new_cell_width = widget->allocation.width / view->board_width;
+    if (new_cell_width == 0)
+       new_cell_width = 1;
+    new_cell_height = widget->allocation.height / view->board_height;
+    if (new_cell_height == 0)
+       new_cell_height = 1;
+
+    if (new_cell_width != view->cell_width
+       || new_cell_height != view->cell_height) {
+       int i;
+       rr_robot_t robot;
+       rr_target_t target;
+
+       view->cell_width = new_cell_width;
+       view->cell_height = new_cell_height;
+
+       cairo_save (xrs);
+       cairo_scale (xrs,
+                view->cell_width / GRR_SVG_ASSUMED_WIDTH,
+                view->cell_height / GRR_SVG_ASSUMED_HEIGHT);
+
+       grr_icon_predraw (view->cell1_icon, xrs,
+                         view->cell_width, view->cell_height);
+       grr_icon_predraw (view->cell2_icon, xrs,
+                         view->cell_width, view->cell_height);
+
+       grr_icon_predraw (view->wall_icon, xrs,
+                         view->cell_width, view->cell_height);
+
+       for (i=0; i < RR_NUM_ROBOTS; i++) {
+           robot = rr_robot_from_idx (i);
+           grr_icon_predraw (view->robot_icon[i], xrs,
+                             view->cell_width, view->cell_height);
+       }
 
-    rr_board_get_size (view->board, &view->board_width, &view->board_height);
+       for (i=0; i < RR_NUM_TARGETS; i++) {
+           target = rr_target_from_idx (i);
+           grr_icon_predraw (view->target_icon[i], xrs,
+                             view->cell_width, view->cell_height);
+       }
 
-    view->cell_width = widget->allocation.width / view->board_width;
-    if (view->cell_width == 0)
-       view->cell_width = 1;
-    view->cell_height = widget->allocation.height / view->board_height;
-    if (view->cell_height == 0)
-       view->cell_height = 1;
+       cairo_restore (xrs);
+    }
+
+    view->cell_width = new_cell_width;
+    view->cell_height = new_cell_height;
+
+    if (event->area.width) {
+       int x_start, y_start;
+       int x, y;
+       int x_stop, y_stop;
+       grr_board_view_transform_pixel_to_cell (view,
+                                               event->area.x, event->area.y,
+                                               &x_start, &y_start);
+       grr_board_view_transform_pixel_to_cell (view,
+                                               event->area.x + event->area.width - 1,
+                                               event->area.y + event->area.height - 1,
+                                               &x_stop, &y_stop);
+       for (y = y_start; y <= y_stop; y++)
+           for (x = x_start; x <= x_stop; x++)
+               view->damaged[y][x] = 1;
+    }
+
+    if (event->count > 0)
+       return FALSE;
+
+    cairo_translate (xrs, -x_off, -y_off);
 
     view->board_pad_x = (widget->allocation.width - view->board_width * view->cell_width) / 2;
     view->board_pad_y = (widget->allocation.height - view->board_height * view->cell_height) / 2;
 
-    XrTranslate (xrs, view->board_pad_x, view->board_pad_y);
+    cairo_translate (xrs, view->board_pad_x, view->board_pad_y);
 
-    goal_target = rr_board_get_goal_target (view->board);
+    goal_target = rr_board_get_goal_target (board);
 
-    /* Draw cell targets */
+    /* Draw cell contents */
     for (j=0; j < view->board_height; j++) {
        for (i=0; i < view->board_width; i++) {
-           XrSave (xrs);
-           XrTranslate (xrs, i * view->cell_width, j * view->cell_height);
-           grr_cell_draw (xrs,
-                          rr_board_get_cell (view->board, i, j),
-                          goal_target,
-                          view->cell_width, view->cell_height);
-           XrRestore (xrs);
-       }
-    }
+           if (! view->damaged[j][i])
+               continue;
+           rr_cell_t cell = rr_board_get_cell (board, i, j);
+           rr_target_t target = RR_CELL_GET_TARGET (cell);
+           rr_robot_t robot = RR_CELL_GET_ROBOT (cell);
+
+           cairo_save (xrs);
+           cairo_translate (xrs, i * view->cell_width, j * view->cell_height);
+
+           if ((i+j) % 2 == 0)
+               grr_icon_draw_predrawn (view->cell1_icon, xrs);
+           else
+               grr_icon_draw_predrawn (view->cell2_icon, xrs);
+
+           if (target) {
+               if (target && target != goal_target) {
+                   cairo_save (xrs);
+                   cairo_set_alpha (xrs, 0.25);
+                   grr_icon_draw_predrawn (view->target_icon[rr_target_idx (target)], xrs);
+                   cairo_restore (xrs);
+               } else {
+                   grr_icon_draw_predrawn (view->target_icon[rr_target_idx (target)], xrs);
+               }
+           }
 
-    /* Draw grid. */
-    XrSave (xrs);
-    XrSetRGBColor (xrs, .75, .75, 1);
-    XrSetLineWidth (xrs, 1);
-    for (j=0; j < view->board_height; j++) {
-       XrMoveTo (xrs, 0, j * view->cell_height + 0.5);
-       XrRelLineTo (xrs, view->board_width * view->cell_width, 0);
-    }
-    for (i=0; i < view->board_width; i++) {
-       XrMoveTo (xrs, i * view->cell_width + 0.5, 0);
-       XrRelLineTo (xrs, 0, view->board_height * view->cell_height);
+           if (robot)
+               grr_icon_draw_predrawn (view->robot_icon[rr_robot_idx (robot)], xrs);
+
+           cairo_restore (xrs);
+       }
     }
-    XrStroke (xrs);
-    XrRestore (xrs);
 
     /* Draw goal target in center of board */
-    XrSave (xrs);
-    XrTranslate (xrs,
-                (view->board_width / 2 - 1) * view->cell_width,
-                (view->board_height / 2 - 1) * view->cell_height);
-    grr_cell_draw (xrs, goal_target, goal_target,
-                  view->cell_width * 2, view->cell_height * 2);
-    XrRestore (xrs);
+    /* XXX: Not a perfect heuristic. Should check for the vacant box too. */
+    if (view->board_width == 16 && view->board_height == 16) {
+       cairo_save (xrs);
+       cairo_translate (xrs,
+                    (view->board_width / 2 - 1) * view->cell_width,
+                    (view->board_height / 2 - 1) * view->cell_height);
+       cairo_scale (xrs,
+                    2 * view->cell_width / GRR_SVG_ASSUMED_WIDTH,
+                    2 * view->cell_height / GRR_SVG_ASSUMED_HEIGHT);
+       cairo_rectangle (xrs, 0, 0, GRR_SVG_ASSUMED_WIDTH, GRR_SVG_ASSUMED_HEIGHT);
+       cairo_set_rgb_color (xrs, 1, 1, 1);
+       cairo_fill (xrs);
+       grr_icon_draw (view->target_icon[rr_target_idx (goal_target)], xrs);
+       cairo_restore (xrs);
+
+       /* Draw clock */
+       if (view->time < 60.0) {
+           cairo_save (xrs);
+           cairo_new_path (xrs);
+           cairo_move_to (xrs,
+                          (double) view->board_width / 2 * view->cell_width,
+                          (double) view->board_height / 2 * view->cell_height);
+           cairo_arc (xrs,
+                      (double) view->board_width / 2 * view->cell_width,
+                      (double) view->board_height / 2 * view->cell_height,
+                      .9 * view->cell_width,
+                      - M_PI_2,
+                      2 * M_PI * (60.0 - view->time) / 60.0 - M_PI_2);
+           cairo_close_path (xrs);
+
+           cairo_set_rgb_color (xrs, 0.0, 0.0, 0.0);
+           cairo_set_alpha (xrs, 0.5);
+           cairo_fill (xrs);
+
+           cairo_restore (xrs);
+       }
+    }
 
     /* Draw walls */
     for (j=0; j < view->board_height; j++) {
        for (i=0; i < view->board_width; i++) {
-           XrSave (xrs);
-           XrTranslate (xrs, i * view->cell_width, j * view->cell_height);
-           XrScale (xrs,
+           if (! view->damaged[j][i])
+               continue;
+           view->damaged[j][i] = 0;
+           cairo_save (xrs);
+           cairo_translate (xrs, i * view->cell_width, j * view->cell_height);
+           cairo_scale (xrs,
                     view->cell_width / GRR_SVG_ASSUMED_WIDTH,
                     view->cell_height / GRR_SVG_ASSUMED_HEIGHT);
-           grr_wall_draw (xrs, RR_CELL_GET_WALLS (rr_board_get_cell(view->board, i, j)));
-           XrRestore (xrs);
+           grr_board_view_draw_walls (view, xrs, RR_CELL_GET_WALLS (rr_board_get_cell(board, i, j)));
+           cairo_restore (xrs);
        }
     }
     
-    XrDestroy (xrs);
+    cairo_destroy (xrs);
 
     return FALSE;
 }
 
-/*
-static void
-grr_board_view_pointer_coords_to_grid (grr_board_view_t *view,
-                                      int pointer_x, int pointer_y,
-                                      int *grid_x, af
-*/
+void
+grr_board_view_transform_pixel_to_cell (grr_board_view_t *view,
+                                       int pixel_x, int pixel_y,
+                                       int *cell_x, int *cell_y)
+{
+    int x, y;
+    x = (pixel_x - view->board_pad_x) / view->cell_width;
+    y = (pixel_y - view->board_pad_y) / view->cell_height;
+    if (x < 0)
+       x = 0;
+    if (x >= view->board_width)
+       x = view->board_width - 1;
+    if (y < 0)
+       y = 0;
+    if (y >= view->board_height)
+       y = view->board_height - 1;
+    *cell_x = x;
+    *cell_y = y;
+}
+
+void
+grr_board_view_transform_cell_to_pixel (grr_board_view_t *view,
+                                       int cell_x, int cell_y,
+                                       int *pixel_x, int *pixel_y)
+{
+    *pixel_x = view->cell_width * cell_x + view->board_pad_x;
+    *pixel_y = view->cell_height * cell_y + view->board_pad_y;
+}
+
 static gint
 grr_board_view_button_press (GtkWidget      *widget,
-                      GdkEventButton *event)
+                            GdkEventButton *event)
 {
-  grr_board_view_t *view;
-
-  g_return_val_if_fail (widget != NULL, FALSE);
-  g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
-  g_return_val_if_fail (event != NULL, FALSE);
+    grr_board_view_t *view;
+    rr_cell_t cell;
+    int x, y;
 
-  view = GRR_BOARD_VIEW (widget);
+    g_return_val_if_fail (widget != NULL, FALSE);
+    g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
+    g_return_val_if_fail (event != NULL, FALSE);
+    
+    view = GRR_BOARD_VIEW (widget);
 
-/*
-  grr_board_view_pointer_coords_to_grid (view, event->x, event->y, &i, &j);
-*/
+    grr_board_view_transform_pixel_to_cell (view,
+                                           event->x, event->y,
+                                           &x, &y);
   
-/*
-  if (!view->button &&
-      rr_board_has_robot (view->board, i, j))
-    {
-      gtk_grab_add (widget);
+    cell = rr_board_get_cell (view->board, x, y);
+    if (!view->button && RR_CELL_GET_ROBOT (cell)) {
+
+       gtk_grab_add (widget);
 
-      view->button = event->button;
+       view->button = event->button;
+       grr_board_view_set_active_robot (view, RR_CELL_GET_ROBOT (cell));
 
-      grr_board_view_update_mouse (view, event->x, event->y);
+       grr_board_view_update_mouse (view, event->x, event->y);
     }
-  */
 
-  return FALSE;
+    return FALSE;
 }
 
 static gint
 grr_board_view_button_release (GtkWidget      *widget,
-                         GdkEventButton *event)
+                              GdkEventButton *event)
 {
-  grr_board_view_t *view;
+    grr_board_view_t *view;
+    rr_direction_t dir;
+    int x, y;
+    int robot_x, robot_y;
+    int dx, dy;
 
-  g_return_val_if_fail (widget != NULL, FALSE);
-  g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
-  g_return_val_if_fail (event != NULL, FALSE);
+    g_return_val_if_fail (widget != NULL, FALSE);
+    g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
+    g_return_val_if_fail (event != NULL, FALSE);
 
-  view = GRR_BOARD_VIEW (widget);
+    view = GRR_BOARD_VIEW (widget);
 
-  if (view->button == event->button) {
-/*
+    if (view->button == event->button) {
       gtk_grab_remove (widget);
-*/
-
       view->button = 0;
+    }
+
+    grr_board_view_transform_pixel_to_cell (view, event->x, event->y, &x, &y);
 
-/*
-      grr_board_view_pointer_coords_to_grid (view, event->x, event->y, &i, &j);
-*/
+    rr_board_find_robot (view->board, view->active_robot, &robot_x, &robot_y);
+    dx = x - robot_x;
+    dy = y - robot_y;
+    if (dx == 0 && dy == 0)
+       return FALSE;
 
-      /* XXX: Need to compute direction based on (i, j) and old (i, j) */
-/*
-      rr_client_move (view->client, view->robot, direction);
-*/
+    if (abs(dx) > abs(dy))
+       if (x > robot_x)
+           dir = RR_DIRECTION_EAST;
+       else
+           dir = RR_DIRECTION_WEST;
+    else
+       if (y > robot_y)
+           dir = RR_DIRECTION_SOUTH;
+       else
+           dir = RR_DIRECTION_NORTH;
 
-  }
+    grr_board_view_move_active (view, dir);
 
-  return FALSE;
+    return FALSE;
 }
 
 static gint
 grr_board_view_motion_notify (GtkWidget      *widget,
                         GdkEventMotion *event)
 {
-  grr_board_view_t *view;
-  GdkModifierType mods;
-  gint x, y, mask;
-
-  g_return_val_if_fail (widget != NULL, FALSE);
-  g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
-  g_return_val_if_fail (event != NULL, FALSE);
-
-  view = GRR_BOARD_VIEW (widget);
-
-  if (view->button != 0)
-    {
-      x = event->x;
-      y = event->y;
-
-      if (event->is_hint || (event->window != widget->window))
-       gdk_window_get_pointer (widget->window, &x, &y, &mods);
-
-      switch (view->button)
-       {
+    grr_board_view_t *view;
+    GdkModifierType mods;
+    gint x, y, mask;
+    
+    g_return_val_if_fail (widget != NULL, FALSE);
+    g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
+    g_return_val_if_fail (event != NULL, FALSE);
+    
+    view = GRR_BOARD_VIEW (widget);
+    
+    if (view->button != 0) {
+       x = event->x;
+       y = event->y;
+
+       if (event->is_hint || (event->window != widget->window))
+           gdk_window_get_pointer (widget->window, &x, &y, &mods);
+       
+       switch (view->button) {
        case 1:
-         mask = GDK_BUTTON1_MASK;
-         break;
+           mask = GDK_BUTTON1_MASK;
+           break;
        case 2:
-         mask = GDK_BUTTON2_MASK;
-         break;
+           mask = GDK_BUTTON2_MASK;
+           break;
        case 3:
-         mask = GDK_BUTTON3_MASK;
-         break;
+           mask = GDK_BUTTON3_MASK;
+           break;
        default:
-         mask = 0;
-         break;
+           mask = 0;
+           break;
        }
 
-      if (mods & mask)
-       grr_board_view_update_mouse (view, x,y);
+       if (mods & mask)
+           grr_board_view_update_mouse (view, x,y);
     }
 
-  return FALSE;
+    return FALSE;
 }
 
-static gint
-grr_board_view_timer (grr_board_view_t *view)
+static void
+grr_board_view_update_mouse (grr_board_view_t *view, gint x, gint y)
 {
-    g_return_val_if_fail (view != NULL, FALSE);
-    g_return_val_if_fail (GRR_IS_BOARD_VIEW (view), FALSE);
+    g_return_if_fail (view != NULL);
+    g_return_if_fail (GRR_IS_BOARD_VIEW (view));
 
-    return FALSE;
+    /* XXX: Perhaps should draw a robot here */
 }
 
+void
+grr_board_view_mark_damage (grr_board_view_t *view, int i, int j)
+{
+    int x, y;
+
+    grr_board_view_transform_cell_to_pixel (view, i, j, &x, &y);
+    gtk_widget_queue_draw_area (GTK_WIDGET (view), x, y, view->cell_width, view->cell_height);
+}
+
+#define TIMER_INTERVAL_MS 100.0
+
 static void
-grr_board_view_update_mouse (grr_board_view_t *view, gint x, gint y)
+grr_board_view_refresh_timer (grr_board_view_t *view)
 {
-    gint xc, yc;
-    gfloat old_value;
+    int x, y;
+
+    grr_board_view_transform_cell_to_pixel (view,
+                                           view->board_width / 2 - 1,
+                                           view->board_height / 2 -1,
+                                           &x, &y);
+    gtk_widget_queue_draw_area (GTK_WIDGET (view),
+                               x, y,
+                               2 * view->cell_width,
+                               2 * view->cell_height);
+}
 
-    g_return_if_fail (view != NULL);
-    g_return_if_fail (GRR_IS_BOARD_VIEW (view));
+static gboolean
+grr_board_view_decrement_timer (void *widget)
+{
+    grr_board_view_t *view = widget;
 
-    xc = GTK_WIDGET(view)->allocation.width / 2;
-    yc = GTK_WIDGET(view)->allocation.height / 2;
+    view->time -= TIMER_INTERVAL_MS / 1000.0;
+    view->time += view->drift_correct;
 
-    old_value = view->adjustment->value;
-    view->angle = atan2(yc-y, x-xc);
+    if (view->zap_time) {
+       view->time -= view->zap_time;
+       view->zap_time += 1.0;
+    }
 
-    if (view->angle < -G_PI/2.)
-       view->angle += 2*G_PI;
-    
-    if (view->angle < -G_PI/6)
-       view->angle = -G_PI/6;
+    grr_board_view_refresh_timer (view);
 
-    if (view->angle > 7.*G_PI/6.)
-       view->angle = 7.*G_PI/6.;
-    
-    view->adjustment->value = view->adjustment->lower + (7.*G_PI/6 - view->angle) *
-       (view->adjustment->upper - view->adjustment->lower) / (4.*G_PI/3.);
-    
-    if (view->adjustment->value != old_value)
-       {
-           if (view->policy == GTK_UPDATE_CONTINUOUS)
-               {
-                   g_signal_emit_by_name (GTK_OBJECT (view->adjustment), "value_changed");
-               }
-      else
-         {
-             gtk_widget_queue_draw (GTK_WIDGET (view));
-             
-             if (view->policy == GTK_UPDATE_DELAYED)
-                 {
-                     if (view->timer)
-                         gtk_timeout_remove (view->timer);
-                     
-                     view->timer = gtk_timeout_add (SCROLL_DELAY_LENGTH,
-                                                    (GtkFunction) grr_board_view_timer,
-                                                    (gpointer) view);
-                 }
-         }
-       }
+    if (view->time < 0) {
+       grr_board_view_stop_timer (view);
+       return FALSE;
+    }
+
+    return TRUE;
 }
 
-static void
-grr_board_view_update (grr_board_view_t *view)
+void
+grr_board_view_set_timer (grr_board_view_t *view, double time)
+{
+    /* XXX: It would be good to adjust the clock for latency somewhere... */
+    if (view->timer) {
+       double correction_time;
+       /* Correct any drift within the next 10 seconds, or half the
+          remaining time --- whichever is less. */
+       if (time >= 20.0)
+           correction_time = 10.0;
+       else
+           correction_time = time / 2.0;
+       view->drift_correct = (time - view->time) / (correction_time * TIMER_INTERVAL_MS);
+    } else {
+       view->time = time;
+       view->drift_correct = 0.0;
+       view->zap_time = 0.0;
+    }
+}
+
+void
+grr_board_view_start_timer (grr_board_view_t *view)
+{
+    if (view->timer)
+       return;
+
+    view->timer = gtk_timeout_add (TIMER_INTERVAL_MS, grr_board_view_decrement_timer, view);
+}
+
+void
+grr_board_view_stop_timer (grr_board_view_t *view)
+{
+    if (view->timer == 0)
+       return;
+
+    gtk_timeout_remove (view->timer);
+    view->timer = 0;
+    view->time = 0.0;
+    view->drift_correct = 0.0;
+    view->zap_time = 0.0;
+
+    grr_board_view_refresh_timer (view);
+}
+
+void
+grr_board_view_zap_timer (grr_board_view_t *view)
 {
-  g_return_if_fail (view != NULL);
-  g_return_if_fail (GRR_IS_BOARD_VIEW (view));
+    view->zap_time = 4;
 
-  gtk_widget_queue_draw (GTK_WIDGET (view));
+    grr_board_view_refresh_timer (view);
 }
+