#!/usr/bin/env python

# based on:
# http://svn.openmoko.org/developers/tick/touchtest/touch_test.py

import evas
import ecore
import ecore.evas
import sys
import thread
import struct
from math import sqrt
import time
import os

acc_x = 0
acc_y = 0
lock = thread.allocate_lock()

pool = []
def cleaner_cb(cell, ev, *a, **ka):
	lock.acquire()
	global pool
	for p in pool:
		p.delete()
	pool = []
	lock.release()

def mousedown_cb(cell, ev, *a, **ka):
	x = ev.position.canvas.x
	y = ev.position.canvas.y
	dot = canvas.Rectangle(size=(5,5), pos=(x,y), color=(0, 255, 0, 255))
	dot.pass_events_set(True)
	#print "Down: ("+str(x)+", "+str(y)+")"
	lock.acquire()
	dot.show()
	pool.append(dot)
	lock.release()
	return True

def update():
    while True:
	lock.acquire()
	global pool
	for p in pool:
		p.hide()
		p.pos = (p.pos[0] + acc_x, p.pos[1] + acc_y)
		#print p.pos
		p.show()
	lock.release()
	time.sleep(0.2)

def try_to_put_a_screen(ee, filename):
	screen = canvas.Image()
	screen.file_set(filename)
	w,h = ee.size
	screen.move(0,0)
	screen.resize(w,h)
	screen.fill_set(0,0,w, h)
	screen.pass_events_set(True)
	return screen

def query_accel():
	"""runs in separate thread"""
	global acc_x
	global acc_y
	file = os.open('/dev/input/event3', os.O_RDONLY)
	while True:
		x = 0
		y = 0
		event = os.read(file, 16)
		while event:
			(time1,time2, type, code, value) = \
				struct.unpack('iihhi', event) 
			if type == 3:
				if code == 0:
					x = value
				if code == 1:
					y = value
			if type == 0 and code == 0:
				sum = int(sqrt(x*x + y*y)) / 5
				if sum:
					x /= sum
					y /= sum
				else:
					x = 0
					y = 0
				acc_x = x
				acc_y = -y
			event = os.read(file, 16)

if __name__ == '__main__':
	ee = ecore.evas.SoftwareX11(w=480, h=590)
	ee.title_set("Touch Test")
	canvas = ee.evas
	bg = canvas.Rectangle(color=(0, 0, 0, 255))
	bg.size = canvas.size
	bg.propagate_events = True
	bg.on_mouse_down_add(mousedown_cb)
	if len(sys.argv) >= 2:                                               
		screen = try_to_put_a_screen(ee, sys.argv[1])                
		screen.show()
	cleaner = canvas.Rectangle(size=(50,50), pos=(50,0), color=(255, 255, 255, 255))
	cleaner.on_mouse_down_add(cleaner_cb)
	bg.show()
	cleaner.show()
	ee.show()
	thread.start_new_thread(query_accel, ())
	thread.start_new_thread(update, ())
	ecore.main_loop_begin()