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history/016b_twoinput_unfinish/src/main/java/com/gitee/drinkjava2/frog/objects/Food.java

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+/* Copyright 2018-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
+ * applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
+ * OF ANY KIND, either express or implied. See the License for the specific
+ * language governing permissions and limitations under the License.
+ */
+package com.gitee.drinkjava2.frog.objects;
+
+import static com.gitee.drinkjava2.frog.Env.ENV_HEIGHT;
+import static com.gitee.drinkjava2.frog.Env.ENV_WIDTH;
+import static com.gitee.drinkjava2.frog.Env.FOOD_QTY;
+
+import java.awt.Graphics;
+
+import com.gitee.drinkjava2.frog.Env;
+import com.gitee.drinkjava2.frog.objects.EnvObject.DefaultEnvObject;
+import com.gitee.drinkjava2.frog.util.RandomUtils;
+
+/**
+ * Food randomly scatter on Env
+ * 食物
+ * 
+ * @author Yong Zhu
+ * @since 1.0
+ */
+public class Food extends DefaultEnvObject {//食物除了被吃，它自己没有什么活动,所以没有重写active方法
+    static Food FOOD = new Food(); //FOOD是一个单例，整个环境只允许有一个FOOD实例
+
+    public static int food_ated = 0;
+
+    @Override
+    public void build(Graphics g) {
+        food_ated = 0;
+        for (int i = 0; i < FOOD_QTY; i++) { // 随机位置生成食物
+            int x = RandomUtils.nextInt(ENV_WIDTH);
+            int y = RandomUtils.nextInt(ENV_HEIGHT);
+            if (!Env.hasMaterial(x, y, Material.FOOD)) {
+                Env.setMaterial(x, y, Material.FOOD); //在环境里标记上FOOD
+            }
+        }
+    }
+
+    @Override
+    public void destory(Graphics g) {
+        food_ated = 0;
+        for (int x = 0; x < ENV_WIDTH; x++) // 清除食物
+            for (int y = 0; y < ENV_HEIGHT; y++) {
+                Env.clearMaterial(x, y, Material.FOOD);
+            }
+    }
+
+    public static boolean foundAndAteFood(int x, int y) {// 如果x,y有食物，将其清0，返回true
+        if (Env.hasMaterial(x, y, Material.FOOD)) {
+            food_ated++;
+            Env.clearMaterial(x, y, Material.FOOD);//在环境里清除FOOD
+            return true;
+        }
+        return false;
+    }
+}