Hi, I did an alternative ladder symbol like this for my own purposes, which I can post - tho not till Monday. It is a public Holiday and I am off for 4 days caving/surveying with no network connectivity. ----- Original Message ----- From: "List for Therion users" To:"List for Therion users" Cc:"Benedikt Hallinger" Sent:Wed, 25 Jan 2017 00:51:02 +0200 Subject:[Therion] Symbol for fixed ladder Hello, i get gray hair with metapost while i want to make a line symbol for ladders, so i can nicely draw them in my maps as the cave have alot of them. The basic idea i had was, t define a symbol of one "rung" segment (rung and a little of either sides, like the letter "H") as a symbol picture. Then i wanted to apply this image seamlessly over the length of the given path (straight lines) What i have for now is the following, however it does not show at all (still shows a red line with symbol set AUT in effect), so i have no clue how to even debug this. I tried to start with the example from thbook salted a little with peeks to the internal metapost codes. Can someone assist please? Thank you very much! # Symbol for fixed ladder def l_fixedladder_SKBB (expr P) = T:=identity; cas := 0; dlzka := arclength P; mojkrok:=adjust_step(dlzka, 1.0u); pickup PenC; sideL := (-.20u,0)--(-.20u,0.20u); sideR := (.20u,0)--(.20u,0.20u); rung := (-.20u,0.10u)--(.20u,0.10u); picture symbol,test_symbol; symbol:= image ( thdraw sideL; thdraw sideR; thdraw rung; ); forever: t := arctime cas of P; thdraw symbol shifted (point t of P) withcolor black; cas := cas + mojkrok; exitif cas > dlzka + (mojkrok / 3); % for rounding errors endfor; enddef; _______________________________________________ Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion