bgneal@47: """Chapter 7, exercise 2 in Allen Downey's Think Complexity book.
bgneal@47: 
bgneal@47: Start with an r-pentomino as an initial condition and confirm that the results
bgneal@47: are consistent with the description above. You might have to adjust the size of
bgneal@47: the grid and the boundary behavior.
bgneal@47: 
bgneal@47: """
bgneal@47: import Life
bgneal@47: 
bgneal@47: 
bgneal@47: class RPentomino(Life.Life):
bgneal@47: 
bgneal@47:     def __init__(self, n):
bgneal@47:         super(RPentomino, self).__init__(n, mode='constant', cval=0, random=False)
bgneal@47: 
bgneal@47:         i, j = n / 2, n / 2
bgneal@47:         self.array[i, j] = 1
bgneal@47:         self.array[i, j - 1] = 1
bgneal@47:         self.array[i, j + 1] = 1
bgneal@47:         self.array[i - 1, j] = 1
bgneal@47:         self.array[i + 1, j - 1] = 1
bgneal@47: 
bgneal@47: if __name__ == '__main__':
bgneal@47:     life = RPentomino(150)
bgneal@47:     viewer = Life.LifeViewer(life, delay=1)
bgneal@47:     viewer.animate(steps=1200)