# physics

import pippy, pygame, sys, math
from pygame.locals import *
from pippy import physics

# initialize pygame first thing
pygame.init()
screen = pygame.display.set_mode((1200,900))
clock = pygame.time.Clock()
 
# set up the physics world (instance of Elements)
world = physics.Elements(screen.get_size())
world.renderer.set_surface(screen)
        
# set up initial physics objects
world.add.ground()
world.add.ball((600,0), 50)
world.add.rect((500,0), 25, 300, dynamic=True, density=1.0, restitution=0.16, friction=0.5)

# add 20 more balls
balls = 0
while(balls<20):
    world.add.ball((balls*5+200,balls*5), 50)
    balls+=1

# begin physics simulation
world.run_physics = True

while pippy.pygame.next_frame():
        while world.run_physics:
               
            for event in pygame.event.get():
                if event.type == QUIT:
                    sys.exit()

                elif event.type == KEYDOWN:
                    sys.exit()            

            # clear display with a color
            # (r,g,b), where 0<=value<256
            screen.fill((80,160,240)) 

            # update & draw physics world
            world.update()
            world.draw()

            # update the display
            pygame.display.flip()  
            
            # try to stay at 30 frames per second
            clock.tick(30)