Java设计图形与多媒体处理

时间:2022-03-22 10:15:57

本文实现了两个效果:

第一种,同心圆效果图:

Java设计图形与多媒体处理

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/**
 *程序要求:新建一个600*600像素的应用程序窗口,并在窗口中绘制5个不同颜色的同心圆,
 *所有圆心都是屏幕的中心点,相邻两个圆直接的半径相差50像素
 *效果图如下图所示(颜色随机设置),源程序保存为Ex7_1.java。
 *作者:wwj
 *日期:2012/4/25
 *功能:显示一个有5个不同颜色的同心圆
 **/
 
 import javax.swing.*;
 import java.awt.*;
 import java.awt.Color;
 public class Ex7_1 extends JFrame
 {
   int red,green,blue;
   Color color;
 
   public Ex7_1()
   {
     super("一个有5个不同颜色的同心圆");  //显示窗口名称
     setSize(600,600);           //设置窗口大小
     setVisible(true);           //设置为可见
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置窗口关闭动作
   
   }
 
   
   public void paint(Graphics g)
   {
     //第一个圆
    red=(int)(Math.random()*255);
    green=(int)(Math.random()*255);
    blue=(int)(Math.random()*255);
    color=new Color(red,green,blue);
    g.setColor(color);
    g.fillOval(175,175,250,250);
    //第二个圆
    red=(int)(Math.random()*255);
    green=(int)(Math.random()*255);
    blue=(int)(Math.random()*255);
    color=new Color(red,green,blue);
    g.setColor(color);
    g.fillOval(200,200,200,200);
    //第三个圆
    red=(int)(Math.random()*255);
    green=(int)(Math.random()*255);
    blue=(int)(Math.random()*255);
    color=new Color(red,green,blue);
    g.setColor(color);
    g.fillOval(225,225,150,150);
    //第四个圆
    red=(int)(Math.random()*255);
    green=(int)(Math.random()*255);
    blue=(int)(Math.random()*255);
    color=new Color(red,green,blue);
    g.setColor(color);
    g.fillOval(250,250,100,100);
    //第五个圆
    red=(int)(Math.random()*255);
    green=(int)(Math.random()*255);
    blue=(int)(Math.random()*255);
    color=new Color(red,green,blue);
    g.setColor(color);
    g.fillOval(275,275,50,50);
 
   }    
   
   public static void main(String[] args)
   {
     Ex7_1 e = new Ex7_1();   
   }
 
 }

第二种,播放音乐和切换图片的小程序效果图:

Java设计图形与多媒体处理

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/**
 *程序要求:编写一个Applet的小程序,准备5幅图片和三个音乐文件,绘制到Applet中,
 *并增加几个按钮,控制图片的切换、放大、缩小和音乐文件的播放。
 *作者:wwj
 *日期:2012/4/29
 *参考:neicole
 *功能:能进行图片和歌曲的选择变换的applet小程序
 **/
 
 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.*;
 import java.applet.Applet;
 import java.applet.AudioClip;
 
  
 public class Ex7_2 extends Applet implements ActionListener,ItemListener
 {
 
   //创建两个面板
   JPanel p1=new JPanel();
   JPanel p2=new JPanel();
   JPanel p3=new JPanel();
   //声音对象
   AudioClip[] sound=new AudioClip[3];
   int playingSong=0;
   //切换图片的按钮
   JButton lastPic=new JButton("上一张");
   JButton setLarge=new JButton("放大");
   JButton setLittle=new JButton("缩小");
   JButton nextPic=new JButton("下一张");
   //切换歌曲的按钮
   JButton lastSound=new JButton("上一首");
   JButton play=new JButton("播放");
   JButton loop=new JButton("连续");
   JButton stop=new JButton("停止");
   JButton nextSound=new JButton("下一首");
   //曲目下拉列表
   JComboBox xx;
   String names[]={ "曲目1.wav","曲目2.wav","曲目3.wav"};
   
  //创建画布对象
  MyCanvasl showPhotos;
 
    
 
   public void init()
   {
     //窗口布局
     this.setLayout(new BorderLayout());
 
     //为图片控制按钮注册监听器
     lastPic.addActionListener(this);
     setLarge.addActionListener(this);
     setLittle.addActionListener(this);
     nextPic.addActionListener(this);
 
     //向面板p1添加组件
     p1.add(lastPic);
     p1.add(setLarge);
     p1.add(setLittle);
     p1.add(nextPic);
     p1.repaint();
   
    //实例化下拉列表对象
    xx = new JComboBox(names);
    xx.addItemListener(this);
 
    //为控制播放音乐按钮注册监听器
    lastSound.addActionListener(this);
    play.addActionListener(this);
    loop.addActionListener(this);
    stop.addActionListener(this);
    nextSound.addActionListener(this);
 
    for(int i=0;i<3;i++)
     {
      sound[i]=getAudioClip(getCodeBase(),"music/"+"曲目"
          +Integer.toString(i+1)+".wav");
     }
     
 
     
    //向面板p2添加组件
     p2.add(xx);
     p2.add(lastSound);
     p2.add(play);
     p2.add(loop);
     p2.add(stop);
     p2.add(nextSound);
     p2.repaint();
     
    showPhotos = new MyCanvasl();
    p3.add(showPhotos);
     p3.repaint();
 
    //把面板p1和p2分别布置到窗口的北部和南部 
     add(p1,BorderLayout.NORTH);
     add(p2,BorderLayout.SOUTH);
     add(p3,BorderLayout.CENTER);
 
     this.repaint();
 
   }
 
 
   //按钮的事件处理
   public void actionPerformed(ActionEvent e)
   {
 
     
    if(e.getSource() == lastPic){
      showPhotos.changePhotoShow('P');
    }
    else if(e.getSource() == nextPic){
      showPhotos.changePhotoShow('N');
    }
    else if(e.getSource() == setLarge){
      showPhotos.changePhotoSize('B');
    }
    else if(e.getSource() == setLittle){
      showPhotos.changePhotoSize('S');
    }
   
    else if(e.getSource()==lastSound){ //上一首
      sound[playingSong].stop();
      playingSong=(playingSong-1+3)%3;
      xx.setSelectedIndex(playingSong);
      sound[playingSong].play();
 
    }
    else if(e.getSource()==play){    //按下播放按钮
      sound[playingSong].play();
    }
    else if(e.getSource()==loop){    //按下循环按钮
      sound[playingSong].loop();
    }
    else if(e.getSource()==stop){    //按下停止按钮
      sound[playingSong].stop();
    }
    else{                //下一首
      sound[playingSong].stop();
      playingSong=(playingSong+1)%3;
      xx.setSelectedIndex(playingSong);
      sound[playingSong].play();
 
    }  
   }
 
 
   //下拉列表的事件处理
   public void itemStateChanged(ItemEvent e)
   {
      
     sound[playingSong].stop();
     sound[playingSong]=getAudioClip(getCodeBase(),"music/"+xx.getSelectedItem());
   }
 
  class MyCanvasl extends Canvas
  {
     
    public Image[] img=new Image[5];
 
    int MaxWidth = 600;
    int MaxHeight = 500;
    int nowImageIndex = 0;
    int coordinateX = 0;
    int coordinateY = 0;
    int currentWidth = MaxWidth;
    int currentHeight = MaxHeight;
 
     
    MyCanvasl(){
     setSize(MaxWidth,MaxHeight);
     //获取当前目录下的图片
     for(int i=0;i<5;i++){
       img[i]=getImage(getCodeBase(),"image/"+Integer.toString(i+1)+".jpg");
     }
    }
 
 
    private void changePhotoIndex(int index){
      nowImageIndex = index;
      changePhotoSize('M');
    }
 
 
 
    public void changePhotoShow(char command){
      if('P' == command){
        changePhotoIndex((nowImageIndex + 5 - 1 ) % 5);
      }
      else if('N' == command){
        changePhotoIndex((nowImageIndex + 1) % 5);
      }
    }
     
 
 
     public void changePhotoSize(char command){
      if ('M' == command){
        currentWidth = MaxWidth;
        currentHeight = MaxHeight;
      }
      else if ('B' == command){
        if(MaxWidth >= (currentWidth + 100) && MaxHeight >= (currentHeight + 100)){
          currentWidth += 100;
          currentHeight += 100;
        }
      }
      else if('S' == command){
        if((0 < (currentWidth - 100)) && (0 < (currentHeight - 100))){
          currentWidth = currentWidth - 100;
          currentHeight = currentHeight - 100;
        }
      }
      coordinateX = (MaxWidth - currentWidth) / 2;
      coordinateY = (MaxHeight - currentHeight) / 2;
      repaint();
    }
      //paint方法用来在窗口显示图片
   public void paint(Graphics g){
      g.drawImage(img[nowImageIndex],coordinateX,coordinateY,currentWidth,currentHeight,this);
 
   }
  }
 }

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