Animation

The animations here rely on Gif89Encoder available from http://jmge.net/java/gifenc/ developed by JMG Elliot.

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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static void drawFrame(Graphics2D g, int frame){ g.setColor(Color.green); g.fillRect(0,0,150,100); g.setColor(Color.yellow); g.fillRect(50,8*frame-20,50,20); }

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test text

 

 

 

 

Shooting Star

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static void drawFrame(Graphics2D g, int frame){ int r = 20; Polygon star = new Polygon( new int[]{0,22,95,36,59,0,-59,-36,-95,-22}, new int[]{-100,-31,-31,12,81,38,81,12,-31,-31},10); g.setColor(Color.red); g.fillRect(0,0,300,200); g.setColor(Color.yellow); g.translate(10*frame,10*frame); g.scale(r/100.0,r/100.0); g.fillPolygon(star); g.scale(100.0/r,100.0/r); g.translate(-frame*10,-frame*10); }

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test text