food.java

希望大家多多交流

package food;

import java.awt.*;
import javax.swing.*;
import java.util.*;//使用其中的Random类

import system.*;
import snake.*;

//食物类
public class Food{
  private MainFrame mainFrame;
  private Image[] images;//食物的图片数组
  private Image current_image;//食物当前的图片
  //食物的位置
  private int x;
  private int y;
  //用于产生食物的随机位置，分别为x,y坐标的最大值
  private int iX;
  private int iY;

  //食物的大小
  public static final int WIDTH = 20;
  public static final int HEIGHT = 20;
  //图片总数量
  public static final int AMOUNT = 16;

  public Food(MainFrame frame){
    this.mainFrame = frame;

    this.iX = 25;
    this.iY = 25;

    this.images = new Image[Food.AMOUNT];
    //取得食物图片
    for(int i = 1; i <= this.images.length; i++){
      this.images[i - 1] = this.loadImage(Config.URL_FOOD+"Food_"+i+".gif");
    }
    //初始化食物图片和位置
    this.changeLocation();
  }

  //加载图片
  public Image loadImage(String fileName){
    return new ImageIcon(fileName).getImage();
  }

  //设置食物的位置
  public void setLocation(int x, int y){
    this.x = x;
    this.y = y;
  }

  //给食物设置一个随机位置
  public void changeLocation(){
    do{
      Random r = new Random();
      this.x = r.nextInt(this.iX) * 20;
      this.y = r.nextInt(this.iY) * 20;
    }
    //当食物产生在蛇身上时，重新产生
    while(this.isOnSnake());

    this.changeImage();//更新食物的图片
  }

  //食物是否产生在了贪吃蛇的身上
  public boolean isOnSnake(){
    Snake s = this.mainFrame.getSnake();
    for(int i = 0; i < s.size(); i++){
      Block b = (Block)s.get(i);
      if(this.x == b.getX() && this.y == b.getY()){
        return true;
      }
    }
    return false;
  }

  //返回食物的图片
  public Image getImage(){
    return this.current_image;
  }

  //改变食物的图片为一个随机图片
  public void changeImage() {
    Random r = new Random();
    int i = r.nextInt(Food.AMOUNT);

    this.current_image = this.images[i];
  }

  public int getX(){
    return this.x;
  }

  public int getY(){
    return this.y;
  }
}//:~zj