func NewSheepleNode(t lib.Torus) *lib.SimNode {
sh := &Sheeple{}
sh.D = lib.Vec2(1.0, 0)
sh.S = 1.0
n := lib.EmptyNode()
n.Entity = sh
n.Name = "sheeple"
n.P = randPlace(t)
sh.LastP = lib.Vec2(0, 0)
sh.wander(n, t)
sh.wander(n, t)
return n
}
func randPlace(t lib.Torus) *m.Vector {
x := tmap(rand.Float64(), t.W)
y := tmap(rand.Float64(), t.H)
return lib.Vec2(x, y)
}