PARTICLE System / GRAVITY Simulator - Updated!

This is a trigonometry / physics based particle system which can also simulate friction, bouncing and gravity wells. Several cool effects are possible by this. PLEASE DOWNLOAD IT! The screenshot can't really do it justice. It looks cool. You will also be pleasantly surprised by how short and well-commented the code is. UPDATE: One new example added (Black Hole), improved existing examples, improved colors for visibility. This code is easily capable of handling 3000+ particles and the effects of various gravity sources on them. COMPILE FOR BEST PERFORMANCE. Please vote if you like it!