# -*- coding: utf-8 -*-

# keyboard echo

from SimpleGUICS2Pygame import simpleguics2pygame as simplegui

# initialize state

WIDTH = 200

HEIGHT = 200

ball_radius = 20

ball_pos = [WIDTH/2, HEIGHT/2]

color = "White"

velocity = [0.01, 0.02]

# event handlers

def key_down(key):

global color, ball_radius

offset = 3

if key == simplegui.KEY_MAP["left"]:

ball_pos[0] = (ball_pos[0] + WIDTH - offset) % WIDTH

elif key == simplegui.KEY_MAP["right"]:

ball_pos[0] = (ball_pos[0] + offset) % WIDTH

elif key == simplegui.KEY_MAP["up"]:

ball_pos[1] = (ball_pos[1] + HEIGHT - offset) % HEIGHT

elif key == simplegui.KEY_MAP["down"]:

ball_pos[1] = (ball_pos[1] + offset) % HEIGHT

elif key == simplegui.KEY_MAP["b"]:

if ball_radius < 35:

ball_radius += offset

elif key == simplegui.KEY_MAP["s"]:

if ball_radius > 5:

ball_radius -= offset

color = "Gray"

def key_up(key):

global color

color = 'White'

def draw(canvas):

ball_pos[0] += velocity[0]

ball_pos[1] += velocity[1]

canvas.draw_circle(ball_pos, ball_radius, 2, "Red", color)

# create a frame

frame = simplegui.create_frame("echo", WIDTH, HEIGHT)

# register event handlers

frame.set_keydown_handler(key_down)

frame.set_keyup_handler(key_up)

frame.set_draw_handler(draw)

# start frame

frame.start()