• 81.游戏项目-物体任意角度飞行和停止


     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  * 测试物体沿着任意角度飞行 和停止
    11  * @author Nicholas
    12  * 
    13  */
    14 public class GameFrame3 extends Frame {
    15     Image img = GameUtil.getImage("picture/test3.jpg");
    16 
    17     public void launchFrame(){
    18         setSize(500,500);
    19         setLocation(300,150);
    20         setVisible(true);
    21         
    22         new PaintThread().start();
    23         
    24         addWindowListener(new WindowAdapter(){
    25             public void windowClosing(WindowEvent e) {
    26                 System.exit(0);
    27             }
    28         });
    29     }
    30     
    31     private double x = 100, y = 100;
    32     private double degree = 3.14/3;// 弧度:[0,2*pi];
    33     private double speed = 10;//控制速率
    34     
    35     public void paint(Graphics g) {
    36         g.drawImage(img, (int)x, (int)y, null);
    37         x +=speed * Math.cos(degree);
    38         y +=speed * Math.sin(degree);
    39         if(speed > 0){
    40             speed -= 0.05;
    41         }else {
    42             speed = 0;
    43         }
    44         if(y > 500-50 || y < 30){
    45             degree=-degree;
    46         }
    47         if(x < 0 || x >= 500-50){
    48             degree=Math.PI-degree;
    49         }
    50     }
    51     
    52     class PaintThread extends Thread{
    53         public void run(){
    54             while(true){
    55                 repaint();
    56                 try {
    57                     Thread.sleep(40);
    58                 } catch (InterruptedException e) {
    59                     e.printStackTrace();
    60                 }
    61             }
    62         }
    63     }
    64     public static void main(String[] args) {
    65         GameFrame3 gf=new GameFrame3();
    66         gf.launchFrame();
    67     }    
    68 }

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  • 原文地址:https://www.cnblogs.com/shixinzei/p/8006947.html
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