def lowerlimit(vct, speed):
if vct.Length >= speed:
pass
else:
vct.Unitize()
vct = PVector.Multiply(vct, speed)
return vct
def gettarget_2d(self, eddies):
target_2d = PVector(0, 0, 0)
for i in xrange(len(eddies)):
v = PVector.Subtract(eddies[i].loc, self.loc)
v2d = PVector(
v.X, v.Y,
0) # 2d planer target, X Y are the most important factors
dist2d = v2d.Length
# compute the sum of the arraction vector / distance
v2d.Unitize()
v2d = PVector.Multiply(v2d,
float(eddies[i].gravity / pow(dist2d, 1.0)))
# add vector to attraction vector collection
target_2d = PVector.Add(target_2d, v2d)
#Limit the target length
target_2d = toplimit(target_2d, self.toplimit)
target_2d = lowerlimit(target_2d, self.lowerlimit)
self.target = target_2d
