1. Drawing in Java

2. Create a new JFrame JFrame frame = new JFrame("My Drawing");
public static void main(String[] args) {
JFrame frame = new JFrame("My Drawing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new MySaver()); //class name here!
frame.setSize(600, 600);
frame.setLocationRelativeTo(null);
frame.setVisible(true); }

3. Extend & Implement
public class MySaver extends JPanel implements ActionListener {
//rest of class/main go here

4. public void actionPerformed(ActionEvent e) { // the events to occur }

5. Try your program out
Should have a basic frame drawn to the dimensions you chose
Now let’s add some drawing

6. public void paint(Graphics g) { Graphics2D g2 = (Graphics2D) g; //set a random size Random randy = new Random(); int mySize = randy.nextInt(100); g2.fillOval(0,0, mySize, mySize); g2.fillRect(50, 100, 25,mySize ); }

7. Try your program out
Should have a random oval and rectangle drawn
Now let’s make it redraw different random shapes

8. Create a timer Timer timer; //create a timer
public MySaver() { //constructor – same name as class
timer = new Timer(500, this); //create a timer
timer.setInitialDelay(1000); // just to show a pause at start
timer.start(); //start the timer }

9. public void actionPerformed(ActionEvent e) { // add in repaint repaint(); }

10. public void paint(Graphics g) { //add in super to erase the screen super.paint(g); Graphics2D g2 = (Graphics2D) g; //set a random size Random randy = new Random(); int mySize = randy.nextInt(100); g2.fillOval(0,0, mySize, mySize); g2.fillRect(50, 100, 25,mySize ); }

11. Try your program out
Should have a random oval and rectangle drawn at intervals
Next --- Explore the different things you can draw with strokes; opacity; fill etc. Create a screen saver