MoveTheCircle/MoveTheCircle2.java at master · chrchung/MoveTheCircle · GitHub

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import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.Timer;
import javax.swing.JPanel;
import java.awt.event.KeyListener;
import java.applet.*;

//program description: moves a circle around a scren
//arrow keys to moves around screen, space bar to stop moving

public class MoveTheCircle2{

	/**
	 *
	 */
	private static final long serialVersionUID = 1L;

	public MoveTheCircle2 () {
		JFrame f = new JFrame ();
		f.setSize(500, 500);
		f.setResizable (false);
		f.add (new DrawCircle());
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setVisible(true);
	}


	public class DrawCircle extends JPanel implements KeyListener, ActionListener {
		/**
		 *
		 */
		private static final long serialVersionUID = 1L;
		int x = 100;
		int y = 100;
		int dx = 0;
		int dy = 0;
		Timer t = new Timer (1, this);

		public DrawCircle (){
			t.start ();
			setBackground(Color.BLACK);
			setFocusTraversalKeysEnabled(false);
			addKeyListener(this);
			setFocusable (true);
		}

		public void paintComponent (Graphics g){
			Graphics2D g2d = (Graphics2D) g;
			g2d.setRenderingHint(
			    RenderingHints.KEY_ANTIALIASING,
			    RenderingHints.VALUE_ANTIALIAS_ON);

			super.paintComponent(g);
			g.setColor(Color.WHITE);
			g.fillOval(x, y, 50, 50);
		}

		public void actionPerformed(ActionEvent e) {
			if (x + dx <= 0){
				x = 500;
			}
			if (x + dx >= 500){
				x = 0;
			}
			if (y + dy <= 0){
				y = 478;
			}
			if (y + dy >= 478){
				y = 0;
			}
				x +=dx;
				y +=dy;

			repaint();
		}

		//set movement
		public void keyPressed(KeyEvent e) {
			int event = e.getKeyCode();

			if (event == KeyEvent.VK_RIGHT){
					dx = 1;
					dy = 0;
			}
			if (event == KeyEvent.VK_LEFT){
					dx = -1;
					dy = 0;
			}
			if (event == KeyEvent.VK_DOWN){
					dx = 0;
					dy = 1;
			}
			if (event == KeyEvent.VK_UP){
					dx = 0;
					dy = -1;
			}
			if (event == KeyEvent.VK_SPACE){
					dx = 0;
					dy = 0;
			}
		}


		public void keyReleased(KeyEvent e) {
			// TODO Auto-generated method stub

		}


		public void keyTyped(KeyEvent e) {
			// TODO Auto-generated method stub

		}

	}

	public static void main(String[] args) {
		new MoveTheCircle2 ();
	}

}