Another oldschool effect done using Actionscript3. Somebody complained about the speed? It was not me :-). That demo is very fast and the best thing is that I am using again a ByteArray. Some calculations are done using shifting operators and the tunnel is only 128×128px large. I am using a second BitmapData object to scale everything up to 400×400px and this is very fast now.
The animation is done using the getTimer() so it does not depend on the framerate (which is set to 120). The texture is a simple array of colors which is generated at the start using the XOR operator. It is very nice to have a simple texture for testing and developing.
Another thing is the for vs. while battle. I did some speed tests here. while using i++ < n was slower than the for equivalent. Using --i > -1 has the same speed as for.
[as]
// the for loop (~40ms)
for ( var i: int = 0; i < 600000; i++ )
x += 1.25;
// same speed as for (~40ms)
var i: int = 600000;
while ( --i > -1 )
x += 1.25
// slower (~110ms)
var i: int = 0;
while ( i++ < 600000 )
x += 1.25
[/as]
Maybe it was me doing something wrong but this would be nice because I like the for-oneliners.
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