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Moving block

You can click on "Show" to see the full program.

The method drawFrame is called 20 times; frame is a different value each time, the graphics object is new each time. Draws a yellow rectangle at coordinates (50,8*frame-20) which is (50,-20), (50,-12), (50,-2), (50,6) ... (50,172) So the yellow box appears at the top of the image and moves down a little with each frame.

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Shooting Star

In this example both the x and the y coordinates change at each frame and so the star moves diagonally.

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Rotating Star

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Lots of squares - one is a different colour

We draw 20 squares.

Each of them is yellow - except one.

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Lots of squares - lots of colours

More is more.

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You can include images from other gifs in your output. DrawImage

The animations here rely on Gif89Encoder available from developed by JMG Elliot. That, in turn was developed using Jef Poskanzer's Read Me from Gif89Encoder