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。
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