Java太阳系小游戏分析和源代码
-20150809
近期看了面向对象的一些知识。然后跟着老师的解说做了一个太阳系各行星绕太阳转的小游戏，来练习巩固一下近期学的知识：
用到知识点：类的继承、方法的重载与重写、多态、封装等
分析：
1.须要载入图片、绘图
2.建一个面板。主页面
3.行星类
。
。
。
效果图：
先看一下源代码结构图：
如今逐步分析各个类的功能：
1)工具类—–util包中
–Constant类 封装了游戏中用到的常量
–GameUtil类 封装了游戏的图片载入功能
–MyFrame类 封装了游戏面板的构造。用于各面板的父类
——之所以这样做。目的是为了封装数据。便于程序的扩充
Constant.java
package util;public class Constant {
public static final int GAME_WIDTH = 800;
public static final int GAME_HEIGHT = 600;}
GameUtil.java
package util;import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;import javax.imageio.ImageIO;/**
* 工具类（载入图片）
* @author long
*
*/
public class GameUtil {private GameUtil(){ } //工具类通常将构造方法私有public static Image getImage(String path){
URL u = GameUtil.class.getClassLoader().getResource(path);
BufferedImage img = null;
try {
img = ImageIO.read(u);
} catch (IOException e) {
e.printStackTrace();
}
return img;
}
}
MyFrame.java
package util;import javax.swing.JFrame;
import javax.swing.JPanel;/**
* 游戏面板的父类
* @author long
*
*/
public class MyFrame extends JPanel{/**
* 载入Frame的方法
*/
public void launchFrame(){
JFrame frame = new JFrame("MyGame");
frame.add(this);
frame.setSize(Constant.GAME_WIDTH,Constant.GAME_HEIGHT);
frame.setAlwaysOnTop(true); // 设置其总在最上
frame.setLocationRelativeTo(null); // 设置窗口初始位置
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);new PaintThread().start();
}/**
* 定义一个重画窗口的线程类。是一个内部类
* @author dell
*
*/
class PaintThread extends Thread {public void run(){
while(true){
repaint();
try {
Thread.sleep(40); //1s = 1000ms
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}}public static void main(String[] args) {
new MyFrame().launchFrame();
}}
2)基本的事件处理类—solar包中
–Planet类 行星类继承至Star类
–SolarFrame类 游戏主面板类继承至MyFrame类
–Star类 星球类，各个星球的父类
–Test类 測试类。不须要说明
Planet.java
package solar;import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;import util.GameUtil;/**
* 行星类，继承至Star类
* @author long
*
*/
public class Planet extends Star{
//除了图片、坐标，行星沿着椭圆执行：长轴、短轴、移动速度、旋转角度。绕着某个star执行
double longAxis; //椭圆长轴
double shortAxis; //椭圆短轴
double speed; //飞行速度
double degree; //旋转角度
Star center; //环绕行星public void draw(Graphics g){
//g.drawImage(img, (int)x, (int)y, null);
super.draw(g);
drawTrace(g);
move();
}public void drawTrace(Graphics g){
double traceX,traceY,traceWidth,traceHeight;
traceX = (center.x+center.w/2)-longAxis;
traceY = (center.y+center.h/2)-shortAxis;
traceWidth = 2*longAxis;
traceHeight = 2*shortAxis;Color c = g.getColor();
g.setColor(Color.blue);
g.drawOval((int)traceX, (int)traceY, (int)traceWidth, (int)traceHeight);
g.setColor(c);
}public void move(){
//沿着椭圆轨迹飞行
x = center.x + longAxis * Math.cos(degree);
y = center.y + shortAxis * Math.sin(degree);
degree += speed;
}public Planet(Image img,double x,double y){
super(img,x,y);
}
public Planet(String imgpath,double x,double y){
super(imgpath,x,y);
}
public Planet( Star center,Image img,double longAxis,
double shortAxis,double speed) {
super();
this.x = (center.x+center.w/2) + longAxis;
this.y = (center.y+center.h/2) + shortAxis;
this.img = img;
this.longAxis = longAxis;
this.shortAxis = shortAxis;
this.speed = speed;
this.center = center;
}
public Planet( Star center,String imgPath,double longAxis,
double shortAxis,double speed) {
this(center,GameUtil.getImage(imgPath),longAxis,shortAxis,speed);
}}
SolarFrame.java
package solar;import java.awt.Graphics;
import java.awt.Image;import util.Constant;
import util.GameUtil;
import util.MyFrame;public class SolarFrame extends MyFrame{int width = Constant.GAME_WIDTH/2;
int height = Constant.GAME_HEIGHT/2;Image bg=GameUtil.getImage("images/bg.png");Star sun = new Star("images/sun.jpg",width,height);
Planet earth = new Planet(sun,"images/earth.png",100,60,0.1);
Planet mars = new Planet(sun,"images/mars.png",180,100,0.15);@Override
public void paint(Graphics g) {
g.drawImage(bg, 0, 0, null);
sun.draw(g);
earth.draw(g);
mars.draw(g);
}public static void main(String[] args) {
new SolarFrame().launchFrame();
}}
Star.java
package solar;import java.awt.Graphics;
import java.awt.Image;import util.GameUtil;public class Star {
public Image img;
public double x,y;
int w,h;public void draw(Graphics g){
g.drawImage(img, (int)x, (int)y, null);
}public Star(){
}
public Star(Image img){
this.img = img;
this.w = img.getWidth(null);
this.h = img.getHeight(null);
}
public Star(Image img,double x,double y){
this(img);
this.x = x;
this.y = y;
}
public Star(String imgPath,double x,double y){
this(GameUtil.getImage(imgPath),x,y);
}}
———————————————————————————————–
总结：该小游戏对代码的封装处理的比較好，便于程序的扩充。体现了面向对象的强大，不同的功能封装在不同的类与方法中。把类的公共的部分封装在父类中，提高代码的重用性。前期各个类写的过程中会有各种小问题与细节，但处理完这些后，后期想扩充行星的个数就比較简单了，new一个行星对象，然后画的面板上就可以。面向对象水太深，这仅仅是初步小涉猎，仍需继续努力专研。！！
