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Can someone help me with this?

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I'm trying this out. Basically, what I want to happen is make the square move and stop where I clicked. So far here's what I've done)got some of the code(like the vector class from a book btw):

import pygame,os,sys,math
from pygame.locals import*

white=(255,255,255)
green=(0,255,0)
blue=(0,0,255)
red=(255,0,0)
black=(0,0,0)


class Creep:

def __init__(self,x,y):
self.x=x
self.y=y
self.clicked=0 # creep is not activate
self.speed=100
self.location=(self.x,self.y)
self.image=pygame.draw.rect(screen,white,[self.x,self.y,10,10])
self.image.center=(self.x,self.y)




def draw(self):
self.x=position.x
self.y=position.y
self.image=pygame.draw.rect(screen,white,[self.x,self.y,10,10])
self.image.center=(self.x,self.y)




class Vector2(object):

def __init__(self,x=0,y=0):
self.x=x
self.y=y

def __str__(self):
return "(%s,%s)"%(self.x,self.y)

@classmethod
def from_points(cls,p1,p2):
return cls( p2[0]-p1[0],p2[1]-p1[1])

def get_magnitude(self):
return math.sqrt(self.x**2+self.y**2)

def normalize(self):
magnitude=self.get_magnitude()
self.x/=magnitude
self.y/=magnitude

def __add__(self,rhs):
return Vector2(self.x+rhs.x,self.y+rhs.y)

def __sub__(self,rhs):
return Vector2(self.x-rhs.x,self.y-rhs.y)

def __neg__(self):
return Vector2(-self.x,-self.y)

def __mul__(self,scalar):
return Vector2(self.x*scalar,self.y*scalar)

def __div__(self,scalar):
return Vector2(self.x*scalar,self.y*scalar)







pygame.init()

screen=pygame.display.set_mode((640,480))
clock=pygame.time.Clock()
creep1=Creep(320.,240.)
position=Vector2(creep1.x,creep1.y)
heading=Vector2()

final=None

while True:

for event in pygame.event.get():
if event.type==KEYDOWN:
if event.key==K_ESCAPE:
pygame.quit()
sys.exit()

if event.type==MOUSEBUTTONDOWN:
destination=Vector2(*event.pos)
final=(destination.x,destination.y)
heading=Vector2.from_points((position.x,position.y),(destination.x,destination.y))
heading.normalize()


time_passed=clock.tick()
time_passed_seconds=time_passed/1000.


distance_moved=creep1.speed*time_passed_seconds

screen.fill(black)
creep1.draw()
if creep1.image.center!=final:
position+=heading*distance_moved







pygame.display.flip()

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