I figured it out with the following command: "scantokens ATTR_color;\n" + Scantokens evaluates the string it is applied to, so I just had to change ATTR_color to "color col; col:=red" for example. Carl On Sep 11, 2009, at 3:35 PM, Carl Magnuson wrote:
I am attempting to color the walls of different systems with different colors using the -attr flag and a user defined wall:
portion of code in scrap: line u:wall -attr color "(0.1, 0.2, 0.8);" 1392.9359853260457 -71.62435442682576 1395.5759853260456 125.20564557317425 endline
portion of code in layout: def l_u_wall (expr P)= T:=identity; if known(ATTR__color): pickup PenA; draw P withpen PenA withcolor ATTR__color\n fi; enddef;
initsymbol(\"l_u_wall\");
I am not having any success however. Is it possible to set and read attributes from lines as I am trying to do? Is somebody aware of an alternate way to pass in a color argument to the metapost definition (instead of defining separate walls for each different colored system)?
Thanks,
Carl