Java太阳系小游戏分析和源码详解

最近看了面向对象的一些知识&＃xff0c;然后跟着老师的讲解做了一个太阳系各行星绕太阳转的小游戏&＃xff0c;来练习巩固一下最近学的知识&＃xff1a;

用到知识点&＃xff1a;类的继承、方法的重载与重写、多态、封装等

分析&＃xff1a;

1.需要加载图片、画图

2.建一个面板&＃xff0c;主页面

3.行星类

效果图&＃xff1a;

先看一下源码结构图&＃xff1a;

现在逐步分析各个类的功能&＃xff1a;

1)工具类-----util包中

--Constant类   封装了游戏中用到的常量

--GameUtil类  封装了游戏的图片加载功能

--MyFrame类  封装了游戏面板的构造&＃xff0c;用于各面板的父类

------之所以这样做&＃xff0c;目的是为了封装数据&＃xff0c;便于程序的扩充

Constant.java

package util;

public class Constant {

public static final int GAME_WIDTH &＃61; 800;

public static final int GAME_HEIGHT &＃61; 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(加载图片)

* &＃64;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 &＃61; GameUtil.class.getClassLoader().getResource(path);

BufferedImage img &＃61; null;

try {

img &＃61; 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

* &＃64;author long

*

*/

public class MyFrame extends JPanel{

/**

* 加载Frame的方法

*/

public void launchFrame(){

JFrame frame &＃61; 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); // 设置窗体初始位置

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

new PaintThread().start();

}

/**

* 定义一个重画窗口的线程类&＃xff0c;是一个内部类

* &＃64;author dell

*

*/

class PaintThread extends Thread {

public void run(){

while(true){

repaint();

try {

Thread.sleep(40); //1s &＃61; 1000ms

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

public static void main(String[] args) {

new MyFrame().launchFrame();

}

}

2)主要的事件处理类---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&＃xff0c;各个星球的父类

--Test类  测试类&＃xff0c;不需要说明

Planet.java

package solar;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Image;

import util.GameUtil;

/**

* 行星类&＃xff0c;继承至Star类

* &＃64;author long

*

*/

public class Planet extends Star{

//除了图片、坐标&＃xff0c;行星沿着椭圆运行&＃xff1a;长轴、短轴、移动速度、旋转角度。绕着某个star运行

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; //围绕行星

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 &＃61; (center.x&＃43;center.w/2)-longAxis;

traceY &＃61; (center.y&＃43;center.h/2)-shortAxis;

traceWidth &＃61; 2*longAxis;

traceHeight &＃61; 2*shortAxis;

Color c &＃61; 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 &＃61; center.x &＃43; longAxis * Math.cos(degree);

y &＃61; center.y &＃43; shortAxis * Math.sin(degree);

degree &＃43;&＃61; 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 &＃61; (center.x&＃43;center.w/2) &＃43; longAxis;

this.y &＃61; (center.y&＃43;center.h/2) &＃43; shortAxis;

this.img &＃61; img;

this.longAxis &＃61; longAxis;

this.shortAxis &＃61; shortAxis;

this.speed &＃61; speed;

this.center &＃61; 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 &＃61; Constant.GAME_WIDTH/2;

int height &＃61; Constant.GAME_HEIGHT/2;

Image bg&＃61;GameUtil.getImage("images/bg.png");

Star sun &＃61; new Star("images/sun.jpg",width,height);

Planet earth &＃61; new Planet(sun,"images/earth.png",100,60,0.1);

Planet mars &＃61; new Planet(sun,"images/mars.png",180,100,0.15);

&＃64;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 &＃61; img;

this.w &＃61; img.getWidth(null);

this.h &＃61; img.getHeight(null);

}

public Star(Image img,double x,double y){

this(img);

this.x &＃61; x;

this.y &＃61; y;

}

public Star(String imgPath,double x,double y){

this(GameUtil.getImage(imgPath),x,y);

}

}

总结&＃xff1a;该小游戏对代码的封装处理的比较好&＃xff0c;便于程序的扩充&＃xff0c;体现了面向对象的强大&＃xff0c;不同的功能封装在不同的类与方法中&＃xff0c;把类的公共的部分封装在父类中&＃xff0c;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&＃xff0c;但处理完这些后&＃xff0c;后期想扩充行星的个数就比较简单了&＃xff0c;new一个行星对象&＃xff0c;然后画的面板上即可。面向对象水太深&＃xff0c;这只是初步小涉猎&＃xff0c;仍需继续努力专研&＃xff01;&＃xff01;&＃xff01;

以上就是Java太阳系小游戏分析和源码详解&＃xff0c;希望对大家学习java语言有所帮助。