Ball Applet
i would like to do that the Ball object can
move inside the applet area and
bounce back when boundary is reached.
When the mouse is clicked within the applet,
the co-ordinates are display one the Java console.
However , i don't know how to
1)Display Total time taken when the game is finished
2)The time passed when a ball is killed at the applet's bottom
here is my current code
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import javax.swing.JApplet;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.lang.String;
publicclass BallAppletextends JAppletimplements Runnable{
staticfinalint INC_X = 5;//define x increment
staticfinalint INC_Y = 5;//define y increment
staticfinalint BALL_WIDTH = 15;//define ball oval width
staticfinalint BALL_HEIGHT = 15;//define ball oval height
staticfinalint TOTAL_NUMBER = 10;//define total number of balls
staticfinalint MSG_SIZE = 18;//define the font size of message
intintBallKill = 0;//number of balls killed
longlngBeginTime;//begin time for playing game
longlngEndTime;//end time for playing game
boolean blnBeginGame =false;//whether game is begun
intintMaxX, intMaxY;//applet size
Lab54_Ball[] ball;//ball array
publicvoid init(){
this.getContentPane().setBackground(Color.BLACK);
intMaxX = getSize().width;//obtain applet width
intMaxY = getSize().height-MSG_SIZE-2;//obtain applet height
/* Prepare for mouse click action */
addMouseListener(new MouseListener(){
publicvoid mouseClicked( MouseEvent e ){
handleMouseClicked( e );
}
/* Override the mouse click event */
publicvoid mousePressed( MouseEvent e ){}
publicvoid mouseReleased( MouseEvent e ){}
publicvoid mouseEntered( MouseEvent e ){}
publicvoid mouseExited( MouseEvent e ){}
});
/* Create the Ball threads */
/*Create all the balls */
for (int i=0;i<11;i++){
ball[i] =new Lab54_Ball(intMaxX, intMaxY, BALL_WIDTH, BALL_HEIGHT, INC_X, INC_Y);
}
Thread thread =new Thread(this);
thread.start();
}
publicvoid paint(Graphics g){
super.paint(g);//ensure display is cleaned in each repaint()
Graphics2D g2d = (Graphics2D) g;//casting g to Graphics2D
g2d.setPaint( Color.MAGENTA );
for (int i=0;i<11;i++){
g2d.fill(new Ellipse2D.Double(INC_X, INC_Y, ball[i].intWidth, ball[i].intHeight) );//fill an ellipse
}
/* Display the game messages */
g2d.setPaint(Color.WHITE);
g2d.setFont(new Font("Courier", Font.BOLD, MSG_SIZE) );
if( !blnBeginGame ){
g2d.drawString("Click to Start", 0, intMaxY+MSG_SIZE);
}else{
Display message at the applet's bottom
- Total time taken when the game is finished
- The time passed when a ball is killed */
}
}
publicvoid run(){
while(true){//infinite loop
try{
repaint();//update display
Thread.currentThread().sleep(50);//refresh display in 50ms
}catch(InterruptedException e){
e.printStackTrace();
}
}
}
publicvoid handleMouseClicked(MouseEvent e){
int intX, intY;
intX = e.getX();//mouse x-coordinate
intY = e.getY();//mouse y-coordinate
/* Send mouse coordinates (x,y) to java console */
System.out.println("Mouse at (" + intX +"," + intY +")");
if(blnBeginGame){//game is running
/* Check whether ball is hit */
for(int i=0; i<TOTAL_NUMBER; i++){
if(ball[i] !=null){//for the ball still exists
synchronized( ball[i] ){
IF the ball is hit,
- Kill the ball
- Record the time
- Count the number of balls killed */
ball[i] =null;
}
}
}
}else{
blnBeginGame =true;
lngBeginTime = System.currentTimeMillis();
}
}
}
Message was edited by:
benjaminCcc
Message was edited by:
benjaminCcc>
