import java.awt.*;					// make the graphics libraries available
import java.applet.*;				// make the applet libraries available

public class MovingCircle1 extends Applet // make a new applet
{
	private int xCoord = 0;			// distance from left hand side
	private int yCoord = 0;			// distance from the top
	private int diameter = 40;		// circle diameter
	private int width  = diameter;		// width for fillOval call
	private int depth  = diameter; 		// depth for fillOval call
	private int xChange = 20;			// amount to add to xCoord
	private int appletWidth = 300;		// width of the applet window
			

	public void paint(Graphics g)  // this does the drawing
	{

		g.setColor(Color.blue);		// set the pen colour blue
		g.fillOval(xCoord, yCoord, width, depth); // draw the rectangle
		g.drawString("Hello World", xCoord, yCoord + depth + 20); // write the string
											// if the next drawing position would
											// move the ball off the right hand side
											// of the applet window make the xChange
											// negative
											
						// now check that the ball is within the right side 
		if ((xCoord + diameter + xChange) > appletWidth)
			xChange  = -xChange;
			          // now check that the ball is within the bottom
		             
		             // now check that the ball is within the left side
		             
		             //now check that the ball is within the top


						// now change the values held in xCoord and yCoord
		xCoord = xCoord + xChange;		// move in xChange pixels from the left
		yCoord = yCoord + 20;		// move down 20 pixels from the top

	}
	
}