def close_loop_example():
# one more example, originally not a closed loop curve
F = Formex(pattern('11')).replic(2,1,1) + Formex(pattern('2')).replic(2,2,0)
M = F.toMesh()
draw(M,color='green')
drawNumbers(M,color=red)
drawNumbers(M.coords,color=blue)
print "Original elements:",M.elems
conn = connectivity.connectedLineElems(M.elems)
if len(conn) > 1:
message("This curve is not a closed circumference")
return None
sorted = conn[0]
print "Sorted elements:",sorted
showInfo('Click to continue')
clear()
M = Mesh(M.coords,sorted)
drawNumbers(M)
return M.toFormex()
