说明：  The Fountain Simulation Here I ll explain Some basic physical things (simulation of a water drop) How to get antialiased points How to use blending Some basic physics... The movement of a drop contains two factors: The direction, how the drop gets out of the fountain and the gravity. The position of a drop is pretty easy to compute if you know, how much time has passed since the drop has leaved the fountain. You have to multiplicate the vector of the constant moving (how the drop leaves the fountain) with the time and then subtract the squared time multiplicated with an acceleration factor. This acceleration factor contains the weight of a drop and the power of gravity. This is all. You now have to know the direction, how the drop comes out of the fountain, but this is just a bit calculating with sine and cosine. You can look at my code.