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From: Jeff Higgins <jeff@invalid.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: Whats the error in my program-creating overlapping GOval objects using GraphicsProgram
Date: Fri, 20 Jan 2012 21:52:39 -0500
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On 01/20/2012 08:05 PM, student wrote:
> I am trying to create three concentric circles of different color
> using GraphicsProgram. However the circles never appear to be
> concentric..they appear to be pushed off on the sides of each other as
> if trying to show another dimension.

Reread the GOval documentation.
<http://jtf.acm.org/javadoc/student/acm/graphics/GOval.html#GOval(double,%20double,%20double,%20double)>

I am simply creating and adding
> the GOval objects. May be I am missing something. Is there a way to
> set transparency of the circles?
>
> Adding code below:
>
> import acm.graphics.*;
> import acm.program.*;
> import java.awt.*;
>
> public class Target extends GraphicsProgram {
>
>      final static double radiusOuterCircle = 72.0;
>      final static double radiusMiddleCircle = 47.0;
>      final static double radiusInnerCircle = 22.0;
>
>
>      public void run() {
>
>
>          final double centerX = this.getWidth() / 2.0;
>          final double centerY = this.getHeight() / 2.0;
>
>
>          GOval g = makeCircle(centerX, centerY,radiusOuterCircle ,
> Color.RED);
>          add(g);
>
>
>          g = makeCircle(centerX, centerY,radiusMiddleCircle ,
> Color.WHITE);
>          add(g);
>
>
>          g = makeCircle(centerX, centerY,radiusInnerCircle ,
> Color.RED);
>          add(g);
>
>
>      }
>
>
>
>      private GOval makeCircle(double centerX, double centerY, double
> radius, Color color)
>      {
>
>          GOval g = new GOval(centerX, centerY, radius, radius);
>          g.setFillColor(color);
>          g.setFilled(true);
>
>          return g;
>
>      }
> }