from __future__ import division


#--------------------------------------
class TagMosaic(object):
#--------------------------------------
	"""
	The tag mosaic for the 36h11 family consists of 587 tags
	laid out in 25 rows and 24 columns.

	Without loss of generality, we assume that the center of
	tag 0 lies at (0, 0).
	"""
	def __init__(self, tag_spacing_meters):
		self.scale = tag_spacing_meters

	def get_position_meters(self, id):
		row, col = id % 24, -(id // 24)
		return row*self.scale, col*self.scale

	def get_row(self, id):
		return id // 24

	def get_col(self, id):
		return id % 24