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Multiple
Falling Balls
Complete Source
Code
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class MultipleFalling {
private static MultipleListener
listener;
private static JFrame myFrame;
private static MultiplePanel
myPanel;
private static Ball[] ball;
private static int index = -1;
public static class
MultiplePanel extends
JPanel {
public void
drawRules(Graphics g, int panelHeight) {
Font plainFont = new Font("TimesRoman",Font.PLAIN,14);
Font boldFont = new Font("TimesRoman",Font.BOLD,14);
g.setColor(Color.BLACK);
g.setFont(boldFont);
g.drawString("To Create a ball:",5,panelHeight-40);
g.setFont(plainFont);
g.drawString("Right-Click anywhere on the panel.",120,panelHeight-40);
g.setFont(boldFont);
g.drawString("To Start/Stop a ball:",5,panelHeight-25);
g.setFont(plainFont);
g.drawString("Left-Click on the ball.",140,panelHeight-25);
g.setFont(boldFont);
g.drawString("To Destroy a ball:",5,panelHeight-10);
g.setFont(plainFont);
g.drawString("CTRL + Left-Click on the ball while it is not
moving.",125,panelHeight-10);
}
public void
paintComponent(Graphics g) {
super.paintComponent(g);
for (int i = 0; i <= index; i++) ball[i].draw(g);
g.setColor(Color.LIGHT_GRAY);
g.fillRect(0,getHeight()-60,getWidth(),60);
drawRules(g,getHeight());
if (index + 1 < 10) g.setColor(Color.BLACK);
else g.setColor(Color.RED);
g.setFont(new Font("Courier",Font.BOLD,30));
g.drawString(Integer.toString(index+1),getWidth()-40,getHeight()-20);
}
}
public static class
MultipleListener implements
MouseListener,
ActionListener {
public void
mousePressed(MouseEvent e) {
if (!e.isMetaDown() && !e.isControlDown() && e.getY() < myPanel.getHeight()-60)
{
for (int i = index; i >= 0; i--) {
if (e.getX() > ball[i].x && e.getX() < ball[i].x+50 &&
e.getY() > ball[i].y &&
e.getY() < ball[i].y+50) {
if (ball[i].falling) ball[i].freeze();
else ball[i].fall();
break;
}
}
}
if (e.isMetaDown() && index < ball.length-1 && e.getY() <
myPanel.getHeight()-60) {
index++;
ball[index] = new
Ball(e.getX(),e.getY(),myPanel.getWidth(),myPanel.getHeight());
myPanel.repaint();
}
if (!e.isMetaDown() && e.isControlDown() && e.getY() < myPanel.getHeight()-60)
{
for (int i = index; i >= 0; i--) {
if (e.getX() > ball[i].x && e.getX() < ball[i].x+50 &&
e.getY() > ball[i].y && e.getY() < ball[i].y+50) {
if (!ball[i].falling) {
ball[i] = null;
for (int k = i; k < index; k++) ball[k] = ball[k+1];
ball[index] = null;
index--;
}
break;
}
}
myPanel.repaint();
}
}
public void
mouseReleased(MouseEvent e) {}
public void
mouseClicked(MouseEvent e) {}
public void
mouseEntered(MouseEvent e) {}
public void
mouseExited(MouseEvent e) {}
public void
actionPerformed(ActionEvent e) {
for (int i = 0; i <= index; i++) {
if (ball[i].falling) ball[i].motion();
}
myPanel.repaint();
}
}
public static class
Ball {
Timer timer;
Color color;
int x, y, r, g,
b, panelWidth, panelHeight;
boolean falling;
public Ball(int
x, int y, int panelWidth, int panelHeight) {
timer = new Timer(100, listener);
r = (int)(255*Math.random());
g = (int)(255*Math.random());
b = (int)(255*Math.random());
color = new Color(r,g,b);
this.x = x;
this.y = y;
this.panelWidth = panelWidth;
this.panelHeight = panelHeight;
falling = false;
}
public void
motion() {
if (y < panelHeight-60) y++;
else y = -50;
}
public void
draw(Graphics g) {
g.setColor(color);
g.fillOval(x,y,50,50);
g.setColor(Color.BLACK);
g.drawString(Integer.toString(y),x+17,y+30);
}
public void
freeze() {
timer.stop();
falling = false;
}
public void
fall() {
timer.start();
falling = true;
}
}
public static void
main(String[] args) {
listener = new
MultipleListener();
myPanel = new
MultiplePanel();
myFrame = new
JFrame("Multiple Falling Balls");
ball = new
Ball[10];
myPanel.setBackground(Color.WHITE);
myPanel.addMouseListener(listener);
myFrame.add(myPanel);
myFrame.setSize(516,538);
myFrame.setLocation(100,100);
myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myFrame.setVisible(true);
}
} |