Add touch support to Snake game by dividing the screen into Up/Down/Left/Right zones

Apps/Snake/main/Source/SnakeUi.c

@@ -245,6 +245,41 @@ static void game_play_event(lv_event_t* e) {
             default:
                 break;
         }
+    } else if (code == LV_EVENT_CLICKED) {
+        lv_indev_t* indev = lv_indev_active();
+        if (indev) {
+            lv_point_t point;
+            lv_indev_get_point(indev, &point);
+
+            lv_area_t coords;
+            lv_obj_get_coords(game->container, &coords);
+
+            lv_coord_t w = coords.x2 - coords.x1 + 1;
+            lv_coord_t h = coords.y2 - coords.y1 + 1;
+            lv_coord_t cx = coords.x1 + w / 2;
+            lv_coord_t cy = coords.y1 + h / 2;
+
+            lv_coord_t rx = point.x - cx;
+            lv_coord_t ry = point.y - cy;
+
+            if (rx != 0 || ry != 0) {
+                if (abs(rx) * h > abs(ry) * w) {
+                    // Horizontal touch
+                    if (rx > 0) {
+                        snake_set_direction(game, SNAKE_DIR_RIGHT);
+                    } else {
+                        snake_set_direction(game, SNAKE_DIR_LEFT);
+                    }
+                } else {
+                    // Vertical touch
+                    if (ry > 0) {
+                        snake_set_direction(game, SNAKE_DIR_DOWN);
+                    } else {
+                        snake_set_direction(game, SNAKE_DIR_UP);
+                    }
+                }
+            }
+        }
     } else if (code == LV_EVENT_KEY) {
         uint32_t key = lv_event_get_key(e);
         // Arrow keys, WASD, and punctuation keys for cardputer
@@ -394,6 +429,7 @@ lv_obj_t* snake_create(lv_obj_t* parent, uint16_t cell_size, bool wall_collision
     // Add event callbacks for touch gestures and keyboard
     lv_obj_add_event_cb(game->container, game_play_event, LV_EVENT_GESTURE, obj);
     lv_obj_add_event_cb(game->container, game_play_event, LV_EVENT_KEY, obj);
+    lv_obj_add_event_cb(game->container, game_play_event, LV_EVENT_CLICKED, obj);
     lv_obj_add_event_cb(obj, delete_event, LV_EVENT_DELETE, NULL);
 
     // Set up keyboard focus if available