82.游戏项目-椭圆轨迹的实现
1 package test; 2 3 import java.awt.Frame; 4 import java.awt.event.WindowAdapter; 5 import java.awt.event.WindowEvent; 6 7 public class MyFrame extends Frame { 8 9 public void launchFrame(){ 10 setSize(Constant.GAME_WIDTH,Constant.GAME_HEIGHT); 11 setLocation(300,150); 12 setVisible(true); 13 14 new PaintThread().start(); 15 16 addWindowListener(new WindowAdapter(){ 17 public void windowClosing(WindowEvent e) { 18 System.exit(0); 19 } 20 }); 21 } 22 23 class PaintThread extends Thread{ 24 public void run(){ 25 while(true){ 26 repaint(); 27 try { 28 Thread.sleep(40); 29 } catch (InterruptedException e) { 30 e.printStackTrace(); 31 } 32 } 33 } 34 } 35 36 }
--------------继承 MyFrame的类 减少代码量
1 package test; 2 import java.awt.Color; 3 import java.awt.Font; 4 import java.awt.Frame; 5 import java.awt.Graphics; 6 import java.awt.Image; 7 import java.awt.event.WindowAdapter; 8 import java.awt.event.WindowEvent; 9 /** 10 * 椭圆轨迹的实现 11 * @author Nicholas 12 * 13 */ 14 public class GameFrame4 extends MyFrame { 15 16 Image img = GameUtil.getImage("picture/test3.jpg"); 17 18 private double x = 100, y = 100; 19 private double degree = 3.14/3;// [0,2pi]; 20 21 public void paint(Graphics g) { 22 g.drawImage(img, (int)x, (int)y, null); 23 x = 250 + 100* Math.cos(degree); 24 y = 200 + 50* Math.sin(degree); 25 degree += 0.1; 26 } 27 28 public static void main(String[] args) { 29 GameFrame4 gf=new GameFrame4(); 30 gf.launchFrame(); 31 } 32 }
补：
经常用到的常量可以用一个类封装存储起来
1 package test; 2 /** 3 * 游戏项目中用到的常量 4 * @author Nicholas 5 * 6 */ 7 public class Constant { 8 9 public static final int GAME_WIDTH=500; 10 public static final int GAME_HEIGHT=500; 11 12 }
