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Add sync with az/alt coordinates

Fabrizio Pollastri requested to merge fabrizio/kstars:sync_azalt into master

Overview

Add the capability to perform sync specifying azimuth/altitude coordinates. This capability is mainly intended for mount drivers using the INDI Alignment Subsystem. Previously, only sync with celestial coordinates (RA/DEC) was present.

This added capability is particularly useful at telescope power on when a first coarse alignment is needed. In this case, the telescope axes are first set to some initial position with respect to horizontal coordinates. Then a sync to the azimuth/altitude coordinates corresponding to the telescope initial position is done. After this step, the precise alignment procedures offered by Ekos can be used as usual.

Usage

To sync with azimuth/altitude coordinates, from Ekos Mount tab, open Mount Control window (Mount Control upper right button). In Mount Control window set Type radio button to AZ/AL, input azimuth/altitude coordinates values into RA/AZ and DE/AL boxes. Finally, click SYNC button.

Details

All changes are in .../kstars/ekos/mount/mount.cpp . Since GOTO method already honored the Type switch, working with both RA/DE and AZ/AL coordinates, its code managing the Type switch is copied to the sync method as is.

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