MoverDemo

from math import sqrt
import pygame
from pygame.locals import *
pygame.init()

screen = pygame.display.set_mode((640,480))
pygame.display.set_caption('demo')

red = pygame.Color(255,0,0)
green = pygame.Color(0,255,0)
blue = pygame.Color(0,0,255)
whiteColor = pygame.Color(255,255,255)

click = 1
p1 = (-5,-5)
p2 = (-5,-5)

movers = []

class Mover:



    def __init__(self, x, y):
        self.canMove = False
        self.xStart = x
        self.yStart = y
        self.xPos = x
        self.yPos = y

    def finalPoint(self, x, y):
        MOVE_SPEED = 4
        self.xEnd = x
        self.yEnd = y
        distance = sqrt((self.xStart-self.xEnd)*(self.xStart-self.xEnd)+(self.yStart-self.yEnd)*(self.yStart-self.yEnd)) #Distance formula

        self.xChange = ((self.xStart-self.xEnd)*(MOVE_SPEED))/(distance)
        self.yChange = ((self.yStart-self.yEnd)*(MOVE_SPEED))/(distance)
        self.canMove = True

    def move(self):
        self.xPos -= self.xChange
        self.yPos -= self.yChange


while True:
    screen.fill(whiteColor)

    pygame.draw.circle(screen, blue, (p1[0],p1[1]),5,0)
    pygame.draw.circle(screen, red, (p2[0],p2[1]),5,0)

    for mover in movers:
        if mover.canMove:
            mover.move()
            pygame.draw.circle(screen, green, (mover.xPos,mover.yPos),5,0)

    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
        elif event.type == MOUSEMOTION:
            mousex, mousey = event.pos
        elif event.type == MOUSEBUTTONUP:
            mousex, mousey = event.pos
            if event.button in (1,2,3):
                if click == 1:
                    movers.append(Mover(mousex,mousey))
                    p2 = (-5,-5)
                    p1 = (mousex,mousey)
                    click = 2
                elif click == 2:
                    p2 = (mousex,mousey)
                    movers[len(movers)-1].finalPoint(mousex,mousey)
                    click = 1

        elif event.type == KEYDOWN:
            if event.key == K_ESCAPE:
                pygame.event.post(pygame.event.Event(QUIT))

    pygame.display.update()