Simulation-Boid

模拟鱼群的游动。

首先随机生成一定（可更改）数量的鱼，然后进行wander，当发现视野内（120）有其他鱼，会进行cohesion，过程中会进行separation，velocity match等，直到组成鱼群，以鱼群的形态进行移动。

Simulate the cohesion of fish.

First randomly generate a certain (changeable) number of fish, and then perform wandering. When other fish are found in the field of vision (120), cohesion will be performed, move in the group.