Java design graphics and multimedia processing _java

This article has achieved two effects:

The first, concentric circle effect diagram:

/** * Program requirements: Create a new 600*600 pixel application window, and in the window to draw 5 different colors of concentric circles, * All centers are the center of the screen, the adjacent two Circle direct radius of 50 pixels * effect Diagram as shown below (color randomly set), the source program saved as Ex7_1. 
 Java. 
 * Author: WWJ * Date: 2012/4/25 * Function: Display a concentric round **/import javax.swing.* with 5 different colors; 
 Import java.awt.*; 
 Import Java.awt.Color; 
   public class Ex7_1 extends JFrame {int red,green,blue; 
 
   Color color;  Public Ex7_1 () {super ("a concentric circle with 5 different colors");           Display window name SetSize (600,600);           Sets the window size setvisible (TRUE); 
   Set to Visible setdefaultcloseoperation (jframe.exit_on_close);/Set window close action} public void Paint (Graphics g) 
    {///First round 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); 
    The second circular 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); 
    The third circular 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); 
    Fourth round 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); 
    Fifth round 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 ();  } 
 
 }

Second, the small program effect chart that plays music and toggles pictures:

/** * Program Requirements: Write a small applet program, prepare 5 pictures and three music files, draw into the applet, * and add a few buttons to control the image of the switch, zoom in, zoom out and music file playback. 
 * Author: WWJ * Date: 2012/4/29 * Reference: Neicole * Function: can carry out pictures and songs of the selection of Small applet program **/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 {//Create two Panels JPanel p1=new (); 
   JPanel p2=new JPanel (); 
   JPanel p3=new JPanel (); 
   Sound Object audioclip[] sound=new audioclip[3]; 
   int playingsong=0; 
   Toggle the picture button JButton lastpic=new JButton ("previous"); 
   JButton setlarge=new JButton ("enlarge"); 
   JButton setlittle=new JButton ("shrink"); 
   JButton nextpic=new JButton ("next sheet"); 
   Toggle the song button JButton lastsound=new JButton ("previous"); 
   JButton play=new JButton ("Play"); 
   JButton loop=new JButton ("continuous"); 
   JButton stop=new JButton ("Stop"); 
   JButton nextsound=new JButton ("next song"); 
   Track dropdown list JComboBox xx; String names[]={"Track 1.wav", "Track 2.wav ", Track 3.wav"}; 
 
    
 
   Create Canvas object MYCANVASL Showphotos; 
 
     public void init () {//Window layout this.setlayout (new BorderLayout ()); 
     Register the Listener Lastpic.addactionlistener for the Picture control button (this); 
     Setlarge.addactionlistener (this); 
     Setlittle.addactionlistener (this); 
 
     Nextpic.addactionlistener (this); 
     Add components to the Panel P1 P1.add (lastpic); 
     P1.add (Setlarge); 
     P1.add (Setlittle); 
     P1.add (Nextpic); 
   
    P1.repaint (); 
    Instantiate the Drop-down List object xx = new JComboBox (names); 
 
    Xx.additemlistener (this); 
    Register listener Lastsound.addactionlistener for control play Music button (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/+ tracks +integer.tostring (i+1) 
     + ". wav"); 
     ////Add component to panel P2 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 (); 
     The panel p1 and P2 are respectively arranged to the north and south of the window Add (P1,borderlayout.north); 
     Add (P2,borderlayout.south); 
 
     Add (P3,borderlayout.center); 
 
   This.repaint (); 
      }//button event handling 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) {//previous sound[playingsong].stop (); 
      playingsong= (playingsong-1+3)%3; 
      Xx.setselectedindex (Playingsong); 
 
    Sound[playingsong].play (); else if (E.GETSOURCE () ==play) {//Press the play button Sound[playingsong].play (); 
    else if (E.getsource () ==loop) {//press the Loop button Sound[playingsong].loop (); 
    else if (E.getsource () ==stop) {//Press stop button sound[playingsong].stop (); 
      } else{//Next sound[playingsong].stop (); 
      playingsong= (playingsong+1)%3; 
      Xx.setselectedindex (Playingsong); 
 
    Sound[playingsong].play (); 
     The event handling of the//dropdown list is 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); Gets the currentPicture for (int i=0;i<5;i++) {img[i]=getimage (GetCodeBase (), "image/" +integer.tostring (i+1) + ". jpg") in the directory 
      } private void Changephotoindex (int index) {nowimageindex = index; 
    Changephotosize (' M '); The public void changephotoshow (char command) {if (' P ' = = command) {changephotoindex (Nowimageinde 
      x + 5-1)% 5); 
      else if (' N ' = command) {changephotoindex (Nowimageindex + 1)% 5); } public void Changephotosize (char command) {if (' M ' = = command) {currentwidth = Ma 
        Xwidth; 
      Currentheight = MaxHeight; else if (' B ' = command) {if (MaxWidth >= (currentwidth +) && maxheight >= (Currentheig 
          HT +) {currentwidth + + 100; 
        Currentheight + 100; ' Else if ' (' S ' = command) {if ((0 < (currentWidth-100)) && (0 < CurrentHeight-1 
   00))) {       Currentwidth = currentWidth-100; 
        Currentheight = currentHeight-100; 
      } Coordinatex = (maxwidth-currentwidth)/2; 
      Coordinatey = (maxheight-currentheight)/2; 
    Repaint (); The//paint method is used to display the picture in the window public void paint (Graphics g) {G.drawimage (Img[nowimageindex],coordinatex,coordinat 
 
   Ey,currentwidth,currentheight,this);  } 
  } 
 }

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