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标题: 【分享】Java编程实例:javaApplet聚光灯 [打印本页]

作者: 小七哥    时间: 2009-9-7 00:40     标题: 【分享】Java编程实例:javaApplet聚光灯

代码如下:



 

  import java.applet.*;

  import java.awt.*;

  import java.awt.event.*;

  import java.awt.font.*;

  import java.awt.image.*;

  public class SpotLight extends Applet implements Runnable{

  private String myText;

  boolean stop=false;

  private Font font;

  private int fontSize;

  private Thread mythread;

  private int spotPosition=50;

  private int myTextSize=20;

  private int myTextWidth=0;

  private int fontHeight,baseLine,w;

  public void init(){

  String fonts,temp;

  myText=this.getParameter("text");

  if(myText==null)

  myText="你好!";

  fonts=this.getParameter("fontSize");

  if(fonts==null)

  fontSize=20;

  else

  fontSize=Integer.parseInt(fonts);

  font=new Font("TimesRoman",Font.BOLD,fontSize);

  FontMetrics fm=getFontMetrics(font);

  fontHeight=fm.getHeight();

  baseLine=this.getSize().height/2+fontHeight/3;

  myTextWidth=fm.stringWidth(myText);

  w=fm.stringWidth(myText);

  w=(getSize().width-w)/2;

  spotPosition=w;

  this.setBackground(Color.black);

  }

  public void start(){

  if(stop) stop=false;

  if(mythread==null)

  {

  mythread=new Thread(this);

  mythread.start();

  }

  }

  public void stop(){

  stop=true;

  mythread=null;

  }

  public void update(Graphics g){

  paint(g);

  }

  public void paint(Graphics g){

  g.setFont(font);

  g.setColor(Color.blue);

  g.drawString(myText,w,baseLine);

  g.clipRect(spotPosition,0,myTextSize,getSize().height);

  g.setColor(Color.white);

  g.drawString(myText,w,baseLine);

  spotPosition=(spotPosition+1)%(myTextWidth+100);

  }

  public void run(){

  while(!stop)

  {

  repaint();

  try

  {

  mythread.sleep(50);

  }

  catch(Exception e)

  {

  e.printStackTrace();

  }

  }

  }

  }
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