Question

I Have Been Trying for days on how to do this. Basically You Control A Player, And zombies follow you.
Problem Is, I Cant Seem To Get The Zombies To Follow! I Tried If Statements For Example

    if playerx > zombiex:
        zombiex=zombiex - 2
        screen.blit(zombie,(zombiex,zombiey))

aaaaaand That Didnt Work…. :/
Any Ideas?

Answer 1

Maybe this is what you searched for.

def length(x, y):
    return (x ** 2 + y ** 2) ** .5

def norm(x, y):
    _len    = length(x, y)
    return x / _len, y / _len

class ZombieController(object):

    def __init__(self, zombie_view_range):
        self._zombs = []
        self.append = self._zombs.append
        self._range = zombie_view_range

    def NextFrame(self, player_pos):
        px, py      = player_pos
        _range      = self._range
        for zombie in self._zombs:
            x, y    = zombie.position
            dx, dy  = px - x, py - y
            _len    = length(dx, dy)
            if _len <= _range:
                speed       = zombie.speed
                direction   = norm(dx, dy)
                zombie.positon  = x + direction[0] * speed, y + direction[1] * speed