You're right Roy... It's message, but in my simply example this function is used, because of not correct results with "_tan" and "_per" snaps... I thought I could imitate (_snap) but from origin point and not from read point of (grread)... Unfortunately this is impossible as aperture can't be so large and never mind that for all other snaps my firstly posted example of c:myline works correct... So still I did conversion of my routines to accept new snap markers...
As always, your observation is excellent, thanks Roy...