Drawing Circles

The previous applets in this chapter have only printed text. Here is an applet that draws a circle.

import java.applet.Applet;
import java.awt.*;

// assume that the drawing area is 150 by 150
public class JustOneCircle extends Applet
{
  final int radius = 25;

  public void paint ( Graphics gr )
  { 
    setBackground( Color.lightGray );
    gr.drawOval( (150/2 - radius), (150/2 - radius), radius*2, radius*2 );
   }
}

Here is what the applet paints:

Not all browsers can run applets. If you see this, yours can not.

The method drawOval() is one of the methods of the Graphics object gr. It looks like this:

drawOval( int X, int Y, int width, int height )

This draws a circle or an oval that fits within the rectangle specified by the x, y, width and height arguments. The oval is drawn inside a rectangle whose upper left hand corner is at (X, Y), and whose width and height are as specified.