Hi Pilou,

load for example Torolf's image into MoI, which Pierre has posted, and redraw some cells with polylines. Then use your method were you showed to click on point 1 and 2. You will see that the closed line will not match. Now do the same with clicking in each corner of a cell and you will have the same closed line(s) as Torolf shows. :-)

BTW. i overlaid your right example with the left example in Photoshop and there is also a difference... :-)

Best regards
Stefan