Enable Astrotrac 360 driver guide pulse (#2054)
* Astrotrac 360 driver guide feature update
This is an intermediate commit
* Astrotrac 360 driver guide pulse
Unguided dithering in Ekos does not work with the Astrotrac 360 when
Astrotrac is selected with "Guide via" in the Kstars optical train. List
of changes to potentially enable this feature and some possibly bug
fixes:
- initialize the GuideRate property (currently not initialized). The new
default is set to 0.1x, which is the default rate for the mount
according to the author of the X2 plugin. However, users might need to
set a longer guide pulse to see movement at the default rate. Note, I'm
not sure if the missing initialization is a bug or was omitted by
design.
- check if the mount is tracking before issuing a guide pulse
- use the current tracking rates rather than custom rates to calculate
the mount movement in arcseconds. The custom rates will only be used if
the track mode is set to "Custom".
- if the DEC tracking rate is 0, which is the normal case, then the
velocity for a south guide pulse is set to negative. This ensures that
DEC guide pulses are not always in the same direction as RA when the DEC
rate is 0.
- reset tracking when the guide pulse is finished
I have tested the changes with my mount but the test coverage is very
limited. I don't use a guide camera (hence unguided dithering) so I
don't know what effects, if any, these changes might have on guided
dithering or guiding in general.
