# balloon

name = 'balloon'
type = 'gif'

from baseairobj import *
images = []

import random
DY_CHANGE_INTERVAL = 20
DY     = 0.2

WIND = -0.05

TOP    = game.arena.top
BOTTOM = game.arena.bottom

IMAGE_CHANGE_INTERVAL = 30
MAX_BALLOONS = 5
BALLOON_SPEED = -1.5 * game.groundspeed

def load_game_resources():
    global image, name
    for index in xrange(0,4):
        images.append(gfx.load('%s%d.%s' % (name,index,type)))


class Balloon(AirObj):

    # Class variables
    max = MAX_BALLOONS
    count = 0
    xspeed = BALLOON_SPEED
    
    def __init__(self,x,y,dx,dy): 
        global name,images

        self.images = images
        self.image = images[0]        

        AirObj.__init__(self,name,self.image)
        self.x = x
        self.y = y
        self.rect.topleft = self.x,self.y
        self.dx = Balloon.xspeed
        sign = random.randrange(0,3) - 1
        self.dy = DY * sign
        self.timer = 0
        
        self.index = 0
        self.lastimage = len(self.images) - 1



    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 % IMAGE_CHANGE_INTERVAL == 0:
            self.index += 1
            if self.index > self.lastimage:
                self.index = self.lastimage
            self.image = self.images[self.index]

        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.rect.height:
            self.dead = 1

        if self.y > BOTTOM: 
            self.y = BOTTOM
            self.dy = 0

        self.dx += WIND
        if self.dx < Balloon.xspeed:
            self.dx = Balloon.xspeed

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