Ten Red Circles Applet

Here is the completed applet. Look over how the named values (constants and variables) were used in computing the values for X and Y.

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

// Assume that the drawing area is 300 by 150.
// Draw ten red circles side-by-side across the drawing area.
public class tenCircles extends Applet
{
  final int width = 300, height = 150;

  public void paint ( Graphics gr )
  { 
    gr.setColor( Color.red );

    int count =  0 ;
    while (  count < 10  )
    {
      int radius = (width/10)/2;      // the diameter is width/10

      int X      = count*(width/10);  // the left edge of each of 10
                                      // squares across the area
      int Y      = height/2 - radius; // the top edge of the squares

      gr.drawOval( X, Y, 2*radius, 2*radius );
      count = count + 1; 
    }

  }
}

Here is what the applet does:

Not all browsers can run applets. If you see this, yours can not. You should be able to continue reading these lessons, however.

The arithmetic used in this applet is a bit tedious. If you got lost, go back a few pages. Or just move on. Although arithmetic like this is typical of graphics programming it is not important that you work through every detail.