print __name__
from vector import Vector
import pygame

#a = Vector(1,2)
#print a.eye()
class Circle(object):
	def __init__ (self, pos, vel, rad, color):
		# pos, vel - 2D-vectors
		# rad - float
		# color - tuple (r, g, b)
		self.pos = pos
		self.vel = vel
		self.rad = rad
		self.color = color

	def show(self, screen):
		pygame.draw.circle(screen, self.color, (self.pos.x, self.pos.y), self.rad)

	def updateState(self):
		self.pos += self.vel

2.
 clock = pygame.time.Clock()
    while not done:
        screen.fill((0, 0, 0))
        done = key_handle(objects)
        for obj in objects:
            obj.updateState()
            obj.show(screen)
        pygame.display.flip()
        clock.tick(TICK_COUNT)
        #pygame.draw.rect(screen, (0, 128, 255), pygame.Rect(30, 30, 60, 60))

def main():
    #quad = Quad((255, 255, 255), 80, 80, 30, 30, 0, 0)
    c1 = Circle(Vector(50,50), Vector(1,1), 20, (255, 0, 0))
    shower([c1])
    #shower(get_action([quad]))

if __name__ == "__main__":
	main()

3.
from math import sqrt
print __name__
class Vector(object):
    def __init__(self,x,y):
        self.x=x
        self.y=y
    def length(self):
        return sqrt(self.x * self.x + self.y * self.y)
    def __add__ (self,other):
        return Vector(self.x+other.x,self.y+other.y)
    def __repr__ (self):
        return str(self.x) + " " + str(self.y)
    def dot(self,other):
        return self.x*other.x+self.y*other.y
    def __mul__ (self, c):
        return Vector(c*(self.x),c*(self.y))
    def __rmul__ (self, c):
        return Vector(c*(self.x),c*(self.y))
    def __div__ (self, c):
        return self*(1.0 / c)
    def eye(self):
        return self/self.length()


def main():
    a=Vector(1,2)
    b=Vector(3,4)
    print a
    print b
    c=a.dot(b)
    print c
    c=b.__add__(a)
    print c
    print c.eye()
    i = Vector(1, 1)
    print i.eye()

if __name__ == "__main__":
    main()

4
from vector import Vector

def intersect(ball_1, ball_2):
	pass

def collide(ball_1, ball_2, options = None):
	pass