Text-on-path with cairo
Cairotwisted is the name a piece of code I wrote using pangocairo to lay text on a path. Over the years many people have found it useful, so here is a public post to make sure it's easier to find on the interwebs.
The code is shipped in Pango tarball under examples/cairotwisted.c and can be browsed here
. Click on the thumbnail to see the full size image output.
At the core of it there is a function to map one path onto
another one. This is done by parameterizing the second path and computing it's gradient (see the code
Parameterizing a Bezier curve uniformly is not easy though. I currently flatten curves to lines and use that, but that has its own down sides as the error introduced in the gradient can magnify out of bound. Any ideas?
Labels: cairo, cairotwisted, pango, pangocairo