## brickwork
## a simple test
e2.
angleunit(deg)
# 1's are edge lengths, and 0s and 90s are external angles, given in angleunits (i.e. degrees)
tile(1,180,1,90,1,90,1,180,1,90,1,90)
# consecutive edges in 'tile' description are numbered: 0, 1, 2, 3, 4, 5
# consecutive tile types are numbered: 0, 1, 2, ... (here there is just one type)
# the last 0 means that there is no mirroring
c(0,0,0,3,0)
c(0,1,0,4,0)
c(0,2,0,5,0)