Why cant I draw an ellipse ontop of a MemoryImageSource?

Hi,
I'm using MemoryImageSource source to animate a background, but I want to draw some shapes on top. Below is my update() method, and I try to draw an ellipse, and it simply doesn't show up. Why is this? How can I draw on top of this screen?
public void update(Graphics g) {
source.newPixels(); //Source is of type MemoryImageSource
g.drawImage(img, 0, 0, width, height, null); // img was constructed from MemoryImageSource
g.setColor(Color.GREEN);
g.fillOval(20, 20, 10,10); //Not displayed?
Cheers,
Lloyd

Sorry, I could draw an ellipse it just wasn't visible on screen due to the co-ordinates!

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Why cant I draw an ellipse?

Hi,
I'm using MemoryImageSource source to animate a background, but I want to draw some shapes on top. Below is my update() method, and I try to draw an ellipse, and it simply doesn't show up. Why is this? How can I draw on top of this screen?
public void update(Graphics g) {
source.newPixels(); //Source is of type MemoryImageSource
g.drawImage(img, 0, 0, width, height, null); // img was constructed from MemoryImageSource
g.setColor(Color.GREEN);
g.fillOval(20, 20, 10,10); //Not displayed?
Cheers,
Lloyd

Sorry, I could draw an ellipse it just wasn't visible on screen due to the co-ordinates!

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Why cant I draw an ellipse ontop of a MemoryImageSource?

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