Boom! is a particle explosion simulation. It simulates explosions composed of many individual elastic pieces. Each piece also has a shadow, which has a very nice effect when the explosion occurs over a detailed background graphic.
Boom! is a fun little side project that I devised while looking for a quick way to put explosions into another game I'm writing. It turned out well enough to warrant a GUI so that the user can tweak the particle properties. There is also a 'multiball' feature, so that you can start up several explosions at once!
In this simulation, each particle is an instance of the same class. I used this approach to show how easy it is to create an array of similar objects, each with dynamic property values. It makes for very concise and understandable code!
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Just a quick note: I updated this on 10/25/99. I fixed a bonehead bug that was causing the screen to get updated 200 times each scan instead of 1. You'll notice that it's a *lot* faster now. I also minimized the number of class property accesses and added a speed control. Enjoy! (If this comment was disrespectful, please report it.)
Another update 10/26/99. I fixed a bug in the ballistics model that was making the ball elasticity not work quite right. Now the balls will never bounce forever. I also cleaned up the display routine: Now the EraseBall function is no longer used, and all of the shadows are drawn first so that shadows don't overlap balls. The 3-D effect is much better as a result. This will be the last update, promise! (If this comment was disrespectful, please report it.)
Thanks for a lovely progie, that's truly addictive. However, looking through the code I have found several minor errors, such as passing values to nowhere etc. Is there any chance you could correct these? Many thanks. (If this comment was disrespectful, please report it.)
ASV, you seem to have plenty of time on your hands, want to analyse a couple of programes of mine for me ? (If this comment was disrespectful, please report it.)
2Mb for a little explosion effect? Shocking optimization (or lack of), but otherwise nice effect. (If this comment was disrespectful, please report it.)
NOTE: Fracas version 1.1, which uses this code, is available at www.smozzie.com for free download. (If this comment was disrespectful, please report it.)
This is fun and very attractive! I can't stop playing it... (If this comment was disrespectful, please report it.)
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10/25/1999 11:34:00 AM: 
