Oval draws differently. Why?

Question

Hi, I'm writing a rather simple program for my course at the moment that uses a class called DrawingCanvas. I find DrawingCanvas a pain in the behind to use, so I just make my classes extend JComponent, and have a BufferedImage and associated Graphics object to store the image.
paintComponent just draws the image.
When I run my code, I get rather horrible looking ovals, but when I run the same code, using DrawingCanvas they look fine.
I've looked in the code for drawing canvas and I can't see anything that would make a difference...
Excerpts from my code:
private BufferedImage image;
private Graphics graphics;
image = new BufferedImage(600, 400, BufferedImage.TYPE_INT_RGB);
graphics = image.createGraphics();
public void paintComponent(Graphics g) {
     g.drawImage(image, 0, 0, this);
graphics.fillOval(x, y, width, width / 4);
...The code for DrawingCanvas can be found at [http://ecs.victoria.ac.nz/twiki/pub/Courses/COMP102_2009T2/JavaResources/DrawingCanvas.java]
An image of the ovals (my code, then DrawingCanvas) can be found at [http://i30.tinypic.com/rvlhcg.png]

Answer 1

Which version of jdk did you use?
If it's jdk6, you might want to try
g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);to change behavior of rendering algorithms in software rendering pipeline that is used in BufferedImage.