def resultant_collision_velocity(self, other, e):
""" Return the resultant velocity of current coin on collision with the other coin,
elasticity of the collision is determined the the co-efficient of restitution 'e'."""
""" If they overlap fully then no collision, handle division by zero exception """
if Vector2.length(self.position - other.position) == 0:
return self.velocity
return self.velocity - ((1 + e) * other.mass / (self.mass + other.mass)) * \
Vector2.dot(self.velocity - other.velocity, self.position - other.position) / \
Vector2.length_squared(self.position - other.position) * (self.position - other.position)
def resultant_collision_velocity(self, other, e):
if Vector2.length(self.position - other.position) == 0:
return self.velocity
return self.velocity - ((1 + e) * other.mass / (self.mass + other.mass)) * \
Vector2.dot(self.velocity - other.velocity, self.position - other.position) / \
Vector2.length_squared(self.position - other.position) * (self.position - other.position)
