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# -*- coding: utf-8 -*-
"""
Manages balls collisions
Created on Fri Sep 20 19:57:22 2013
@author: laurent-bernabe
"""
from math import sqrt
from random import randint
def are_colliding_balls(ball_1, ball_2):
"""
Says whether two balls collides.
ball_1 : ball to test => Ball
ball_2 : ball to test => Ball
=> Boolean
"""
b1_x, b1_y = ball_1.get_center()
b2_x, b2_y = ball_2.get_center()
x_dist = abs(b1_x - b2_x)
y_dist = abs(b1_y - b2_y)
b1_radius = ball_1.get_diameter() / 2
b2_radius = ball_2.get_diameter() / 2
centers_dist = sqrt(x_dist ** 2 + y_dist ** 2)
return centers_dist <= (b1_radius + b2_radius)
def manage_colliding_balls(balls_list):
"""
Detects all colliding balls couples of balls_list,
and, for each colliding balls couple, alter both ball
velocity and make a move for both.
balls_list : list of balls => List of Ball
"""
for fst_ball_index in range(len(balls_list[:-1])):
fst_ball = balls_list[fst_ball_index]
inner_range = range(fst_ball_index + 1, len(balls_list))
for snd_ball_index in inner_range:
snd_ball = balls_list[snd_ball_index]
if (are_colliding_balls(fst_ball, snd_ball)):
fst_ball.oppose_velocity_and_move()
snd_ball.oppose_velocity_and_move()
def place_balls(balls_list, balls_area):
"""
Places all the balls of balls_list, randomly, within balls_area
but assuring that balls don't collide each other.
balls_list : list of balls => List of Ball
balls_area : space where ball is allowed to be => Tuple of 4 integers (
left side x, top side y, right side x, bottom side y)
"""
placed_balls = []
for ball in balls_list:
while True:
ball_x = randint(balls_area[0], balls_area[2] + 1)
ball_y = randint(balls_area[1], balls_area[3] + 1)
ball.move_to((ball_x, ball_y))
collides = False
for placed_ball in placed_balls:
curr_collision_state = are_colliding_balls(ball, placed_ball)
collides = collides or curr_collision_state
if not collides:
placed_balls.append(ball)
break
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