@momochow, unfortunately that was on a computer on which the mother (f) board fried. No source is available for me to update. Sorry :(

Not really useful unless you use it properly. Notice how your slower moving flakes only go horizontally and vertically and slightly faster ones might go diagonally (along multiples of 45 degrees). This is caused by hardware constraints (pixel locations on the screen). Better use of the class would allow any angle at any speed.

Much can be done to make this run a lot quicker. (1) convert PointVector class to a Flake class (which is already what it really is -- with the imaging and acting) (2) resetting a flake (to be a new flake) instead of removing and adding a new flake. The second part can be done in the act method of the actor class, thus eliminating the need to iterate through all flakes in the world act method.

Actually, you are setting deltaX to -fallspeed using "=-" where you should be adjusting its value with "+=". Also, when jumping, you need to set deltaX to jumpHeight using "= -".