It's been a while since I added support for constellation boundaries. I've now added support for drawing constellations and asterisms, along with their names.
Since there are no 'official' definitions of constellation patterns, I've followed the constellations defined by the International Astronomical Union.
I've initially placed names at the average position of the component stars. I may add support for a manual position if this results in too many overlapping labels.
Figure 1. Constellations and names.
Figure 2. Constellations, boundaries and names.
