Java之Eclipse实现——在海绵宝宝的比基尼海滩里投喂鱼食

背景图片可以在自己的电脑任意选取一张大小合适的图片，重命名为backround.jpg，把之前的backround.jpg删除，然后直接粘贴进去

抓取图片展示：

AquariumSimulator类

/** File: BlankClass.java* -*--------------------* This class is a blank one that you can change at will. Remember, if you change* the class name, you'll need to change the filename so that it matches.* Then you can extend GraphicsProgram, ConsoleProgram, or DialogProgram as you like.*/
import acm.program.*;public class AquariumSimulator extends Program {// The animation constant.private static final double DELAY = 1000.0 / 50;/*引入fish*/private Tank fishTank = new Tank();public void run() {/*设置屏幕大小*/setSize(Tank.SCREEN_WIDTH, Tank.SCREEN_HEIGHT);// adds the fishtank (which is a GCanvas) to the screenadd(fishTank);fishTank.init();// animates the fishTankwhile(true) {fishTank.heartbeat();pause(DELAY);}}
}

Fish类

import acm.graphics.*;
import acm.util.RandomGenerator;public class Fish{private static final double MOVE_AMT = 3.0;//移动速度private GImage img = null;//鱼图也决定鱼private GPoint goal = null;//鱼饵private boolean isLeftImgShown = false;//是否朝左public Fish() {img = new GImage("blueFishRight.png");isLeftImgShown = false;}public void heartbeat() {//没鱼食了加，把鱼食打印到鱼的目标上if(goal == null) {setGoal();}moveTowardsGoal();}public GImage getImage() {//传出鱼的图return img;}private void moveTowardsGoal() {//决定游泳朝向double dy = goal.getY() - img.getY()-60;double dx = goal.getX() - img.getX()-100;double dist = Math.sqrt(dx * dx + dy * dy);if(dist > MOVE_AMT) {//距离大于游泳速度// move MOVE_AMT pixels towards the goaldouble moveX = MOVE_AMT / dist * dx;double moveY = MOVE_AMT / dist * dy;img.move(moveX, moveY);} else {//吃掉了鱼饵goal = null;Tank.fishfood.beichi();}makeImageMatchDirection(dx);}private void makeImageMatchDirection(double dx) {//转换方向boolean shouldFaceLeft = dx < 0;if(shouldFaceLeft != isLeftImgShown) {//是否与原方向相同if(shouldFaceLeft) {img.setImage("blueFishLeft.png");} else {img.setImage("blueFishRight.png");}isLeftImgShown = shouldFaceLeft;}}private void setGoal() {//随机设立鱼饵RandomGenerator rg = RandomGenerator.getInstance();double maxX = Tank.SCREEN_WIDTH - img.getWidth();double maxY = Tank.SCREEN_HEIGHT - img.getHeight();double goalX = rg.nextDouble(0, maxX);double goalY = rg.nextDouble(0, maxY);goal = new GPoint(goalX,goalY);}public void findfood(double x,double y){goal = new GPoint(x,y);}
}

Tank类

//Tank
/** File: BlankClass.java* ---------------------* This class is a blank one that you can change at will. Remember, if you change* the class name, you'll need to change the filename so that it matches.* Then you can extend GraphicsProgram, ConsoleProgram, or DialogProgram as you like.*/
import java.util.ArrayList;
import acm.graphics.*;public class Tank extends GCanvas {//鱼缸public static final int SCREEN_WIDTH = 800;public static final int SCREEN_HEIGHT = 600;private ArrayList<Fish> fishes = new ArrayList<Fish>();public static final Fishfood fishfood = new Fishfood();public void init() {//设立背景和鱼addBackground();addFishes();}private void addBackground() {//设立背景GImage img = new GImage("background.jpg");img.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);add(img);fishfood.Initfishfood();//                            1}private void addFishes() {//设立鱼for(int i = 0; i < 3; i++) {Fish fish = new Fish();//加鱼add(fish.getImage());fishes.add(fish);}}public void heartbeat() {for(Fish fish : fishes) {fish.heartbeat();if(!fishfood.exit){if(System.currentTimeMillis()>fishfood.startTime){fishfood.exit = true;fishfood.Initfishfood();fish.findfood(fishfood.x, fishfood.y);fishfood.fishfod.setFilled(true);add(fishfood.fishfod,fishfood.x,fishfood.y);}}else {fish.findfood(fishfood.x, fishfood.y);}}}
}

Fishfood类

import acm.util.RandomGenerator;
import java.awt.Color;
import acm.graphics.*;public class Fishfood {boolean exit;public GOval fishfod;public double x,y;public long Sleptime;public long startTime;Fishfood(){this.exit = false;this.x = 0;this.y = 0;this.Sleptime = 2000;this.startTime = System.currentTimeMillis()+this.startTime;fishfod = new GOval(20,20);fishfod.setFilled(false);fishfod.setFillColor(Color.yellow);}public void Initfishfood(){RandomGenerator rg = RandomGenerator.getInstance();this.x = rg.nextDouble(0, Tank.SCREEN_WIDTH);this.y = rg.nextDouble(0, Tank.SCREEN_HEIGHT);}public void beichi(){this.exit = false;fishfod.setFilled(false);this.startTime = System.currentTimeMillis()+this.Sleptime;}
}

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Java之Eclipse实现——在海绵宝宝的比基尼海滩里投喂鱼食

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