[cairo] The Qahirah Notebooks Project

Lawrence D'Oliveiro ldo at geek-central.gen.nz
Sat Nov 28 00:18:06 PST 2015

I wrote:

> So here is the current collection of Qahirah notebooks:
> <https://github.com/ldo/qahirah_notebooks>. I have done one on cubic
> B├ęzier curves, and another on matrices.

I have added another one on text and fonts. This one illustrates the
meanings of the font-metrics and text-metrics fields (confused about
which way the ascent and y-bearing go?) and derives the formulas for
vertically centring text according to the different metrics.

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