import kivy
kivy.require('1.1.1')

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.properties import NumericProperty, ReferenceListProperty, ObjectProperty
from kivy.vector import Vector
from kivy.factory import Factory
from kivy.clock import Clock
from kivy.graphics import Color
from kivy.base import EventLoop
from kivy.graphics import *
class PongPaddle(Widget):
    score = NumericProperty(0)
    def build(self):
        print 'builded'
    def bounce_ball(self, ball):
        if self.collide_widget(ball):
            vx, vy = ball.velocity
            offset = (ball.center_y-self.center_y)/(self.height/2)
            bounced = Vector(-1*vx, vy)
            vel = bounced * 1.1
            ball.velocity = vel.x, vel.y + offset


class PongBall(Widget):
    velocity_x = NumericProperty(0)
    velocity_y = NumericProperty(0)
    velocity = ReferenceListProperty(velocity_x, velocity_y)

    def move(self):
        self.pos = Vector(*self.velocity) + self.pos


class PongGame(Widget):
    ball = ObjectProperty(None)
    player1 = ObjectProperty(None)
    player2 = ObjectProperty(None)

    def serve_ball(self, vel=(4,0)):
        self.ball.center = self.center
        self.ball.velocity = vel
        self.background_color = (255, 255, 0, 0)
    def update(self, *args):
        self.ball.move()

        #bounce of paddles
        self.player1.bounce_ball(self.ball)
        self.player2.bounce_ball(self.ball)

        #bounce ball off bottom or top
        if (self.ball.y < self.y) or (self.ball.top > self.top):
            self.ball.velocity_y *= -1

        #went of to a side to score point?
        if self.ball.x < self.x:
            self.player2.score += 1
            self.serve_ball(vel=(4,0))
        if self.ball.x > self.width:
            self.player1.score += 1
            self.serve_ball(vel=(-4,0))


    def on_touch_move(self, touch):
        if touch.x < self.width/3:
            self.player1.center_y = touch.y
        if touch.x > self.width - self.width/3:
            self.player2.center_y = touch.y


Factory.register("PongBall", PongBall)
Factory.register("PongPaddle", PongPaddle)
Factory.register("PongGame", PongGame)


class PongApp(App):
    def build(self):
        game = PongGame()
        with game.canvas:
            Color(100,0,0, 1)
            Rectangle(pos=(0,0), size=game.size)
        game.serve_ball()
        Clock.schedule_interval(game.update, 1.0/60.0)
        return game



if __name__ == '__main__':
    PongApp().run()