rmjarvis
commented
2 years ago The test suite has some pretty crazy WCS's with very non-square pixels. One was distorted enough that I had to put the |g| < 0.8 guard in for hsm, since the image was coming back as practically a straight line and hsm couldn't do anything useful with it. But yeah, a number of the others were quite non-trivial tests of the math.
This is a quick feature addition requested by @beckermr. It's actually code that I have copied around a few places when I needed to do this, and he pointed out that it is probably widely useful enough to be put into GalSim.
Basically,
wcs.toWorld(shear)will now return the equivalent shear in world coordinates when the input is the measured shear in image coordinates (e.g. from HSM).