example9_9.java

《Java程序设计与应用》-张仕斌-源程序 《Java程序设计与应用》-张仕斌-源程序

/*
 * Example9_9.java
 *
 * Created on 2006年10月19日, 下午12:17
 */

package example9_9;
import java.awt.*;
/**
 
 * @author  Administrator
 */
public class Example9_9 extends java.applet.Applet implements Runnable{
    
    /** Initializes the applet Example9_9 */
  /*  public void init() {
        try {
            java.awt.EventQueue.invokeAndWait(new Runnable() {
                public void run() {
                    initComponents();
                }
            });
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }*/
    int frame;int delay;Thread animator;
	// 初始化界面，定义帧刷新频率
	public void init() {
		String str = getParameter("fps");
		int fps = (str!=null) ? Integer.parseInt(str) : 10;  // fps表示每秒的帧数
		delay = (fps>0) ? (1000 / fps) : 100;
	}
	// 创建一个新线程并使之开始运行
	public void start() {
		animator = new Thread(this); animator.start();
	}
	// 在run方法中实现主要的动画循环
	public void run() {
		long tm = System.currentTimeMillis();
		while (Thread.currentThread() == animator) {      
			repaint();   // 显示下一帧      
			try {
				tm += delay;   // 等待一定的时间
				Thread.sleep(Math.max(0,tm -System.currentTimeMillis()));
			}
			catch(InterruptedException e) {break;} 
			frame ++;   // 切换到下一帧
		}
	}
	// 当applet不再可见时停止操作
	public void stop() {animator = null;}
	//画图
	public void paint(Graphics g) 
        {
		g.setColor(Color.black);
		g.drawString("Frame" + frame, 0 , 30);
	}

    /** This method is called from within the init() method to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc=" Generated Code ">//GEN-BEGIN:initComponents
    private void initComponents() {
        
        setLayout(new java.awt.BorderLayout());
        
    }
    // </editor-fold>//GEN-END:initComponents
    
    
    // Variables declaration - do not modify//GEN-BEGIN:variables
    // End of variables declaration//GEN-END:variables
    
}