On Sun, Oct 18, 2009 at 9:11 PM, Aurelien Giraud < aureliengiraud@googlemail.com> wrote:

Hello,

I am new to ConTeXt and I have looked on the internet for a way to do something special. Unfortunately I have not found any solution.

I hope this is the right place for such a question. I apologise otherwise.

I would like to highlight (e.g. put in bold, or change the color...) any character on a page which sits on a chosen path. I would like to be able to position for instance an invisible circle on a page and have all the characters "in contact" with this circle change color so that the circle become visible via these characters. Is it something I could do with ConTeXt?

Thanks in advance.

I think yes,but now I have not time to try. Something with metapost, maybe. -- luigi

On Sun, Oct 18, 2009 at 21:11, Aurelien Giraud wrote:

Hello,

I am new to ConTeXt and I have looked on the internet for a way to do something special. Unfortunately I have not found any solution.

I hope this is the right place for such a question. I apologise otherwise.

I would like to highlight (e.g. put in bold, or change the color...) any character on a page which sits on a chosen path. I would like to be able to position for instance an invisible circle on a page and have all the characters "in contact" with this circle change color so that the circle become visible via these characters. Is it something I could do with ConTeXt?

This won't be of any help to you ... ... but I remember seeing one of early luatex showcases with characters colored in the shape of circular wave (smoothly varying color - really impressive), but I have no idea if that has ever been published anywhere. (I'm writing this because I'm also interested to see that masterpiece again.) Mojca I don't know how to do it, but I would bet that it is possible to misuse luatex for it (before printing out a character you check its position on page, do some basic math and output the desired color). It's usually done by overwriting some lua function. Just a tiny warning if you do get a solution from someone: LuaTeX might not be absolutely stable in this respect yet, so you need to take in account some slight possibility that the low level interface undergoes some changes in future. In that case you might need to adapt your code after a while. You should not worry about it now, it's just good to keep it in mind.