On 19/02/2025 15:58, Bill Gee wrote:
I would also like a way to produce a map which has SOME (not all) cross- sections. Right now it is all or nothing. You either get every cross- section or you get no cross-sections. This might be done by using PDF layers and letting the cross-section scrap specify the layer it goes on.
You can sort of do this with -attr <name> <value>. <name> Then use this in metapost p36 thbook You can test presence of such a variable using if known ATTR_<name>: ... fi. However, my metapost was not good enough and I kept getting bugs. So I used python to pull them out, then removed the ones I wanted. I thought I had put the code online, but cannot find it! However, the use of attr would work better if symbol-hide worked for it. Unfortunately I do not think that it does. You could abuse the system by abusing the -context option and setting it to a symbol you do not use then turn that off with symbol-hide. Andrew