#ZZZ bouncing_square.py

# bouncing_square.py <<< ZZZ ? flickers

from appuifw import *
import e32
from graphics import *

running = 1
def quit():
    global running
    running = 0
app.exit_key_handler = quit

def draw(rect):
    try: canvas.blit(img)
    except: pass

img = None
app.screen = 'large'
app.orientation = 'portrait'
app.directional_pad = False
app.body = canvas = Canvas(redraw_callback=draw)
img = Image.new(canvas.size)
res_x, res_y = canvas.size

dy = 1
dx = 1
x1 = 0
y1 = 0

while running:
    x1 = x1 + dx
    y1 = y1 + dy
    x2 = x1 + 100
    y2 = y1 + 100
    if (x1 < -50):
        dx = -1 * dx
    elif (x1 > res_x - 50):
        dx = -1 * dx
    if (y1 < -50):
        dy = -1 * dy
    elif (y1 > res_y - 50):
        dy = -1 * dy
    img.clear(0x000000)
    img.rectangle((x1, y1, x2, y2), fill=0xff0000)
    draw(())
    e32.ao_yield()