def cohesion(self, others):
''' Return acceleration towards center of mass of nearby birds
'''
count = 0
steerx = 0
steery = 0
xavg = 0
yavg = 0
for n in range(0, len(others)):
dist = self.distance(others[n])
sx, sy = self.distanceVector(others[n])
# Add acceleration for any birds within the cone of vision
if dist < self.nd and dist > 0.0 and \
(sx*self.vx+sy*self.vy)/(self.vx**2+self.vy**2) > self.alpha:
count = count + 1
xavg = xavg + others[n].x
yavg = yavg + others[n].y
if count > 0:
xavg = xavg / count
yavg = yavg / count
# Create ghost boid representing the center of mass of the others
ghost = Boid()
ghost.x = xavg
ghost.y = yavg
steerx, steery = self.distanceVector(ghost)
length = sqrt(steerx**2+steery**2)
steerx = steerx/length*self.maxforce
steery = steery/length*self.maxforce
steerx = steerx - self.vx
steery = steery - self.vy
return steerx, steery
def cohesion(self, others):
''' Return acceleration towards center of mass of nearby birds
'''
count = 0
steerx = 0
steery = 0
xavg = 0
yavg = 0
for n in range(0, len(others)):
dist = self.distance(others[n])
sx, sy = self.distanceVector(others[n])
# Add acceleration for any birds within the cone of vision
if dist < self.nd and dist > 0.0 and \
(sx*self.vx+sy*self.vy)/(self.vx**2+self.vy**2) > self.alpha:
count = count + 1
xavg = xavg + others[n].x
yavg = yavg + others[n].y
if count > 0:
xavg = xavg / count
yavg = yavg / count
# Create ghost boid representing the center of mass of the others
ghost = Boid()
ghost.x = xavg
ghost.y = yavg
steerx, steery = self.distanceVector(ghost)
length = sqrt(steerx**2 + steery**2)
steerx = steerx / length * self.maxforce
steery = steery / length * self.maxforce
steerx = steerx - self.vx
steery = steery - self.vy
return steerx, steery
def cohesion(self, others):
''' Returns acceleration towards center of mass of nearby others
'''
count = 0
steerx = 0
steery = 0
xavg = 0
yavg = 0
for n in range(0, len(others)):
dist = self.distance(others[n])
if dist < self.nd and dist > 0.0:
count = count + 1
xavg = xavg + others[n].x
yavg = yavg + others[n].y
if count > 0:
xavg = xavg / count
yavg = yavg / count
# Create ghost boid representing the others
ghost = Boid()
ghost.x = xavg
ghost.y = yavg
steerx, steery = self.distanceVector(ghost)
length = sqrt(steerx**2+steery**2)
steerx = steerx/length*self.maxforce
steery = steery/length*self.maxforce
steerx = steerx - self.vx
steery = steery - self.vy
return steerx, steery
