import java.awt.*; import javax.swing.*; import java.awt.event.*; /** * Class TrafficLights - At the click of a button, change the traffic lights * * @author Chase Conner * @version JDK 8 * @course CSCI 1130-01 * @date 10-2-15 */ public class TrafficLights extends JApplet implements ActionListener { private JButton GO, STOP, WAIT ; private int carX = 200; private boolean clickGO = false; private boolean clickSTOP = false; private boolean clickWAIT = false; /** * 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 It is called when the Web page that * contains this JApplet has been replaced by another page, and also * just before the JApplet is to be destroyed.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 /* * Statement to activate the squence of instructions when GO is clicked. * Turns on the green light and * switches off the red or the yellow light. */ if (clickGO == true) { // instructions to draw and fill in the circle to display the green light when GO is pressed g.setColor(Color.black); g.drawOval(63, 184, 30, 30); g.setColor(Color.green); g.fillOval(63, 184, 30, 30); //switches off the red and yellow light when GO is pressed clickSTOP = false; clickWAIT= false; } /* * Statement to activate the squence of instructions when STOP is clicked. * Turns on the red light and * switches off the green or the yellow light. */ if (clickSTOP == true) { //instructions to draw and fill in the circle for the red light when STOP is clicked g.drawOval(63, 112, 30, 30); g.setColor(Color.red); g.fillOval(63, 112, 30, 30); //switches off the green and yellow light when STOP is pressed clickGO = false; clickWAIT = false; } /* * Statement to activate the sequence of instructions when WAIT is clicked. * turns on the yellow light for wait and * turns off the red or the green light. */ if (clickWAIT == true) { //instructions to draw and fill in the circle for the yellow light when WAIT is clicked g.setColor(Color.black); g.drawOval(63, 148, 30, 30); g.setColor(Color.orange); g.fillOval(63, 148, 30, 30); //switches off the green and red light when WAIT is pressed clickGO = false; clickSTOP = false; } } public void actionPerformed(ActionEvent event) { if (event.getSource() == GO) { clickGO = true; //turns on the green light clickWAIT = false; //switches off the yellow light if it was on clickSTOP = false; //switches off the red light if it was on carX -= 15; //moves the car to the left repaint(); //redraws and refill the oval for the green light } if (event.getSource() == STOP) { clickSTOP = true; //turns on the red light clickGO = false; //switches off the green light if it was on clickWAIT = false; //switches off the yellow light if it was on repaint(); //redraw and refill the the oval for the red light } if (event.getSource() == WAIT) { clickWAIT = true; //turns on the yellow light clickSTOP = false; // switches off the red light if it was on clickGO = false; // switches off the green light if it was on repaint(); //redraw and refill the oval for the yellow light } } /** * Called by the browser or applet viewer to inform this JApplet that it * is being reclaimed and that it should destroy any resources that it * has allocated. The stop method will always be called before destroy. */ { // provide code to be run when JApplet is about to be destroyed. } /** * Returns information about this applet. * An applet should override this method to return a String containing * information about the author, version, and copyright of the JApplet. * * @return a String representation of information about this JApplet */ public String getAppletInfo() { // provide information about the applet return "Title: Traffic Lights \nAuthor: Chase Conner \n At the click of a button, change the traffic lights"; } /** * Returns parameter information about this JApplet. * Returns information about the parameters than are understood by this JApplet. * An applet should override this method to return an array of Strings * describing these parameters. * Each element of the array should be a set of three Strings containing * the name, the type, and a description. * * @return a String[] representation of parameter information about this JApplet */ public String[][] getParameterInfo() { // provide parameter information about the applet String paramInfo[][] = { {"firstParameter", "1-10", "description of first parameter"}, {"status", "boolean", "description of second parameter"}, {"images", "url", "description of third parameter"} }; return paramInfo; } }