# demo of animation using asteroid sprite sheet

import simplegui

# load 64 frame sprite sheer for asteroid - image source is opengameart, artist is warspawn

ROCK_CENTER = [64, 64]

ROCK_SIZE = [128, 128]

ROCK_DIM = 64

rock_image = simplegui.load_image("http://commondatastorage.googleapis.com/codeskulptor-assets/asteroid1.opengameart.warspawn.png")

# global time for animation

time = 0

# draw handler

def draw(canvas):

global time

current_rock_index = (time % ROCK_DIM) // 1

current_rock_center = [ROCK_CENTER[0] + current_rock_index * ROCK_SIZE[0], ROCK_CENTER[1]]

canvas.draw_image(rock_image, current_rock_center, ROCK_SIZE, ROCK_CENTER, ROCK_SIZE)

time += 0.2

# create frame and size frame based on 128x128 pixel sprite

frame = simplegui.create_frame("Asteroid sprite", ROCK_SIZE[0], ROCK_SIZE[1])

# set draw handler and canvas background using custom HTML color

frame.set_draw_handler(draw)

frame.set_canvas_background("Blue")

# start animation

frame.start()