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- import java.awt.*;
- import javax.swing.*;
- import java.awt.event.*;
- /**
- * Class TrafficLights - At the click of a button, change the traffic lights
- *
- * @author Mickey Mouse
- * @version JDK 8
- * @course CSCI 1130-01
- * @date 10-2-15
- */
- public class TrafficLights extends JApplet implements ActionListener {
- private JButton WAIT, STOP, GO;
- private boolean clickWAIT = false;
- private boolean clickSTOP = false;
- private boolean clickGO = false;
- private int carX = 200;
- /**
- * Called by the browser or applet viewer to inform this JApplet that it
- * has been loaded into the system. It is always called before the first
- * time that the start method is called.
- */
- public void init()
- {
- setLayout( new FlowLayout()); // changes the layout from BorderLayout to FlowLayout
- WAIT = new JButton ("WAIT"); //adds WAIT label to button
- WAIT.setForeground(Color.yellow); //changes the label to yellow
- //adds the WAIT JButton to the screen
- add (WAIT);
- WAIT.addActionListener(this);
- GO = new JButton ("GO"); //adds GO label to button
- GO.setForeground(Color.green); //changes the label to green
- //adds the button to the screen
- add (GO);
- GO.addActionListener(this);
- STOP = new JButton ("STOP"); //adds STOP label to button
- STOP.setForeground(Color.red); //changes the label to red
- //adds STOP JButton to screen
- add (STOP);
- STOP.addActionListener(this);
- }
- /**
- * Called by the browser or applet viewer to inform this JApplet that it
- * should start its execution. It is called after the init method and
- * each time the JApplet is revisited in a Web page.
- */
- public void start()
- {
- // provide any code requred to run each time
- // web page is visited
- }
- /**
- * Called by the browser or applet viewer to inform this JApplet that
- * it should stop its execution. It is called when the Web page that
- * contains this JApplet has been replaced by another page, and also
- * just before the JApplet is to be destroyed.
- */
- public void stop()
- {
- // provide any code that needs to be run when page
- // is replaced by another page or before JApplet is destroyed
- }
- /**
- * Paint method for applet.
- *
- * @param g the Graphics object for this applet
- */
- public void paint(Graphics g)
- {
- super.paint(g);
- //declares and retrieves the images from their file locations
- Image img = getImage(getDocumentBase(), "stoplights.png");
- Image img2 = getImage(getDocumentBase(), "car.jpg");
- g.drawImage( img, 50, 100, 300, 350, 0, 0, 5000, 5000, this ); //draws and resizes the stoplights image
- g.drawImage( img2, carX, 400, 1000, 1000, 0, 0, 5000, 5000, this); //draws and resizes the car image
- //draw and fill an oval red for the STOP stoplight when STOP is pressed
- if (clickSTOP == true);
- {
- g.drawOval(63, 112, 30, 30);
- g.setColor(Color.red);
- g.fillOval(63, 112, 30, 30);
- clickSTOP = false;
- }
- //draw and fill an oval yellow for the WAIT stoplight when WAIT is pressed
- if (clickWAIT == true);
- {
- g.setColor(Color.black);
- g.drawOval(63, 148, 30, 30);
- g.setColor(Color.orange);
- g.fillOval(63, 148, 30, 30);
- clickWAIT = false;
- }
- //draw and fill an oval green for the GO stoplight when GO is pressed
- if (clickGO == true);
- {
- g.setColor(Color.black);
- g.drawOval(63, 184, 30, 30);
- g.setColor(Color.green);
- g.fillOval(63, 184, 30, 30);
- clickGO = false;
- }
- }
- public void actionPerformed(ActionEvent event)
- {
- /*
- * Links the JButtons and the graphic sequences to display the lights
- *
- */
- if(event.getSource() == GO) //display green if GO is clicked
- {
- clickGO = true;
- carX -=15;
- repaint();
- }
- if (event.getSource() == WAIT) //display yellow if WAIT is clicked
- {
- clickWAIT = true;
- repaint();
- }
- if (event.getSource() == STOP) //display red if STOP is clicked
- {
- clickSTOP = true;
- repaint();
- }
- }
- /**
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