# plane 0

name = 'plane0'
type = 'gif'

from baseairobj import *
image = None

import random
DY_CHANGE_INTERVAL = 20
DY     = 0.2
TOP    = game.arena.top
BOTTOM = game.arena.bottom-70

def load_game_resources():
    global image, name
    image = gfx.load('%s.%s' % (name,type))


class Plane0(AirObj):
    def __init__(self):
        global name,image
        AirObj.__init__(self,name,image)
        self.dx = -3 * game.groundspeed
        self.timer = 0

    def tick(self, speedadjust):
        self.x += self.dx * speedadjust
        if self.x < 0 - self.rect.width:
            self.dead = 1

        self.timer += 1
        if self.timer % DY_CHANGE_INTERVAL == 0:
            sign = random.randrange(0,3) - 1
            self.dy += DY * sign

        self.y += self.dy * speedadjust
        if self.y < TOP:
            self.y = TOP
        elif self.y > BOTTOM: 
            self.y = BOTTOM

        self.rect.topleft = [self.x,self.y]