Hi I'm wondering if there is a way to scale the size of line ornamentation with the -scale option? I am thinking about arrows (and map-connections) as in a previous post. I notice that I can apply -scale to a line wall Eg line wall -scale xs subtype debris <list of coordinates> endline and the line will plot, but at always at normal scale. I can see why that might be, as there seems to be no way to pass the scale value into the metapost definition of the wall (or arrow) line object. However if I put in a layout. min-symbol-scale m then the wall (or arrow) that has a scale of s or xs will not plot (as I think is expected). So there is some crude on/off control, but I have not found where it is done. So I am wondering, is there some way that we can have more refined control of the scale of line ornamentation (wall debris, blocks, arrow heads)? I notice line arrow takes the special argument -head [both | none | begin]. Somewhere between the th2 file and the metapost arrow definition, the argument -head gets changed to the variable Q that is parsed to the metapost code, that controls which ends of the arrow line get arrow heads. I have copied the code below. Whereabouts is the code that tells Therion that -head is parsed to the metapost definition as Q? Bruce In th2 file. line arrow -head both <coordinates> endline In thline.mp or in a layout file. code metapost % Q = 0 -- no arrows % 1 -- end % 2 -- begin % 3 -- both def l_arrow (expr P, Q) = T:=identity; pickup PenB; thdraw P; p := (-.1u,-.5u)--(0,0)--(.1u,-.5u)--cycle; % 0.25 changed to .5 and close end to get nicer arrowhead if odd Q: thfilldraw p rotated (angle(thdir(P,0))+90) shifted (point 0 of P); fi; if Q>1: thfilldraw p rotated (angle(thdir(P,length P))-90) shifted (point infinity of P); fi; enddef;