class Topographer(object):
    def __init__(self, size, **kwargs):
        for key, value in kwargs.iteritems():
            setattr(self, key, value)

        self.size = size

    def boundary(self):
        lx = self.size[0] - 1
        ly = self.size[1] - 1
        hx = 0
        hy = 0

        for x in range(self.size[0]):
            for y in range(self.size[1]):
                c = self.get(x, y)

                if c is None:
                    continue

                if lx > x: lx = x
                if ly > y: ly = y
                if hx < x: hx = x
                if hy < y: hy = y

        return ((lx, ly), (hx + 1, hy + 1))

    def render(self):
        low, high = self.boundary()
        x = low[0]

        print '+%s+' % ('-' * (high[1] - low[1]))

        while x < high[0]:
            line, y = '|', low[1]
            while y < high[1]:
                c = self.get(x, y)
                if c is None:
                    c = ' '
                line += str(c)
                y += 1
            print line + '|'
            x += 1

        print '+%s+' % ('-' * (high[1] - low[1]))

    def get(self, x, y):
        for z in range(self.height):
            if self.volume[x, y, z] != 0:
                return '@'