use ObjectPool for food items

visualization/static/visualization/FoodSprite.js

-function FoodSprite(texture, decay_rate, food_id, pos_x, pos_y, value)
+function FoodSprite(texture)
 {
     PIXI.Sprite.call(this, texture);
-    this.food_value = value;
-    this.item_id = food_id;
-    this.decay_rate = decay_rate;
-    this.textureRadius = texture.width / 2;
+    this.food_value = 0;
+    this.decay_rate = 0;
+    this.item_id = 0;
     this.anchor.set(0.5);
-    this.x = pos_x;
-    this.y = pos_y;
+    this.textureRadius = 32;
     this.tint = this.GetRandomTint();
-    this.UpdateSize();
 }
 
 FoodSprite.prototype = Object.create(PIXI.Sprite.prototype);
 
+FoodSprite.prototype.SetData = function(decay_rate, food_id, pos_x, pos_y, value)
+{
+    this.decay_rate = decay_rate;
+    this.food_value = value;
+    this.item_id = food_id;
+    this.x = pos_x;
+    this.y = pos_y;
+    this.UpdateSize();
+};
+
 FoodSprite.prototype.UpdateSize = function()
 {
     let size = Math.sqrt(this.food_value) / this.textureRadius;

visualization/static/visualization/GameVisualization.js

@@ -37,6 +37,10 @@ function GameVisualization(assets, snakeMoveStrategy, container)
     this.segmentPool = new ObjectPool(function() {
         return new SnakeSegment(this.txBody);
     }, this, 10000);
+
+    this.foodItemPool = new ObjectPool(function() {
+        return new FoodSprite(this.txFood);
+    }, this, 10000);
 }
 
 GameVisualization.prototype.Run = function()
@@ -80,6 +84,7 @@ GameVisualization.prototype.RemoveSnake = function(id)
     if (id in this.snakes)
     {
         this.mainStage.removeChild(this.snakes[id].Container);
+        this.snakes[id].Destroy();
         delete this.snakes[id];
     }
 };
@@ -114,12 +119,13 @@ GameVisualization.prototype.HandleTickMessage = function(frame_id)
     {
         for (let food_id in this.foodItems)
         {
-            if (!this.foodItems[food_id].visible)
+            let item = this.foodItems[food_id];
+            if (!item.visible)
             {
                 delete this.foodItems[food_id];
+                this.foodItemPool.free(item);
             }
         }
-
         this.foodMap.CleanUp();
     }
 
@@ -155,7 +161,8 @@ GameVisualization.prototype.HandleWorldUpdateMessage = function(data)
 
 GameVisualization.prototype.AddFood = function(food_id, pos_x, pos_y, value)
 {
-    let sprite = new FoodSprite(this.txFood, this.food_decay_rate, food_id, pos_x, pos_y, value);
+    let sprite = this.foodItemPool.get();
+    sprite.SetData(this.food_decay_rate, food_id, pos_x, pos_y, value);
     this.foodItems[food_id] = sprite;
     this.foodMap.AddSprite(sprite);
 };
@@ -180,7 +187,16 @@ GameVisualization.prototype.HandleFoodConsumedMessage = function(food_id, consum
     if (food_id in this.foodItems)
     {
         let sprite = this.foodItems[food_id];
-        this.snakes[consumer_id].Eat(sprite);
+        if (consumer_id in this.snakes)
+        {
+            this.snakes[consumer_id].Eat(sprite);
+        }
+        else
+        {
+            this.foodItems[food_id].visible = false;
+            delete this.foodItems[food_id];
+            this.foodItemPool.free(sprite);
+        }
     }
 };
 

visualization/static/visualization/Snake.js

@@ -29,6 +29,27 @@ function Snake(headTexture, segmentPool, name, colorScheme, world_size_x, world_
     this.Container.addChild(this._nameSprite);
 }
 
+Snake.prototype.Destroy = function()
+{
+    while (this._segments.length>0)
+    {
+        let segment = this._segments.pop();
+        this._segmentContainer.removeChild(segment.GetSprite());
+        this._segmentPool.free(segment);
+    }
+
+    while (this._foodContainer.children.length>0)
+    {
+        let foodItem = this._foodContainer.children[0];
+        foodItem.visible = false; // will be removed with decayed food
+        this._foodContainer.removeChild(foodItem);
+    }
+
+    this._foodContainer.destroy();
+    this._segmentContainer.destroy();
+    this.Container.destroy();
+};
+
 Snake.prototype.SetData = function(data)
 {
     this.heading = data.heading;
@@ -163,8 +184,7 @@ Snake.prototype.AnimateEat = function()
         if (dist < radius)
         {
             food.visible = false;
-            this._foodContainer.removeChildAt(i);
-            return; // FIXME this aborts eating for this animation cycle
+            this._foodContainer.removeChild(food);
         }
 
         let factor = (dist-food.speed) / dist;