New plot overlay capability

The latest version of SkyView has a new capability for drawing overlays on SkyView images. One major use of this will be to allow us to provide templates of the fields of view of various telescopes. E.g., in the image below we’ve overlaid information on the fields of view of two of the instruments of the Swift observatory on a simple DSS image of the region around 3c273. The X-ray Telescope (XRT) field of view has calibration sources (C1-4) marked in the corners, while the UltraViolet-Optical Telescope (UVOT) has a large rotation (and small offset) with respect to the satellite’s nominal pointing.

XRT and UVOT Fields of View over 3c273

The overlays use simple ‘Draw’ files that describe the fields of view. E.g., the draw file for the XRT part of the overlay above is just:

reset
scale 2.36"

thick 2
color cyan

-300 -301
300 -301
300 301
-300 301
-300 -301

text 0 270 0 XRT FOV
text 0 -290 0 XRT FOV
text 290 0 90 XRT FOV
text -270 0 90 XRT FOV

thick 1
color pink
circle -265 269 47
circle 273 260 48
circle -264 -274 47
circle 276 -281 44

text -265 269 0 C0
text 273 260 0 C1
text -264 -274 0 C2
text 276 -281 0 C3

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