def generateCollidingPair(x, y, z, name1, name2, tcollision):
"""Create a set of airplanes which will collide at position x, y, z in tcollision seconds"""
crashpos = vector.recvec(x, y, z)
phi1 = -math.pi + random.random_sample() * 2.0 * math.pi
phi2 = -math.pi + random.random_sample() * 2.0 * math.pi
v = airplane.ControllableAirplane.vcruise
v1 = vector.sphvec(v, math.pi / 2.0, phi1)
v2 = vector.sphvec(v, math.pi / 2.0, phi2)
pos1 = crashpos - v1 * tcollision
pos2 = crashpos - v2 * tcollision
airplane1 = airplane.ControllableAirplane(name1, pos1, v1)
airplane2 = airplane.ControllableAirplane(name2, pos2, v2)
return airplane1, airplane2
def generateRandomPlane(name,altitude):
phi = -math.pi+random.random_sample()*2.0*math.pi
dir_flight = phi+3.0*math.pi/4.0+random.random_sample()*math.pi/2.0
position = vector.cylvec(70000.0,phi,altitude)
velocity = vector.sphvec(airplane.ControllableAirplane.vcruise,math.pi/2.0,dir_flight)
return airplane.ControllableAirplane(name,position,velocity)