"""Very simple example that does not depend on any third party library such 
as pygame or pyglet like the other examples. 
"""

import pymunk
import pymunk.util
from pymunk import Vec2d
import math, sys, random

def main():
              
    space = pymunk.Space()
    space.gravity = (0.0, -900.0)
    
    ## Balls
    balls = []
          
    ticks_to_next_ball = 10
    for x in range(5000):            
        ticks_to_next_ball -= 1
        if ticks_to_next_ball <= 0:
            ticks_to_next_ball = 10000
            mass = 10
            radius = 25
            inertia = pymunk.moment_for_circle(mass, 0, radius, (0,0))
            body = pymunk.Body(mass, inertia)
            x = random.randint(115,350)
            body.position = x, 400
            shape = pymunk.Circle(body, radius, Vec2d(0,0))
            space.add(body, shape)
            balls.append(shape)
        
        
        balls_to_remove = []
        
        for ball in balls:
            if ball.body.position.y < 0: balls_to_remove.append(ball)
        for ball in balls_to_remove:
            space.remove(ball, ball.body)
            balls.remove(ball)

        if len(balls) >= 1:
           v = balls[0].body.position
           print("(in on_draw): point = %.2f, %.2f" % (v.x,v.y))

        ### Update physics
        for x in range(1):
            space.step(1/50.0)
        

if __name__ == '__main__':
    sys.exit(main())
