D26218: Improve Linear Focus Algorithm by adding extra outward motion then moving back in.

[Hy Murveit]

murveit created this revision.
murveit added a reviewer: mutlaqja.
Herald added a project: KDE Edu.
Herald added a subscriber: kde-edu.
murveit requested review of this revision.

REVISION SUMMARY
  At the start of its first and 2nd passes, the linear focuser moves out to
  some position N. Now it will move to N+M and then move back in to N before
  starting its inward capture sweep. This is done to remove backlash effects
  inside the capture sweep, and to make sure the last motion was inward
  to solify the focuser's position. There is also a small fix to a log message
  and a bug-fix change to the way maxTravel was implemented in the linear focus
  algorithm.

TEST PLAN
  Main thing to see is that at the start, instead of moving out to a certain
  focus position, it moves further out (by 5 focus steps), and then moves back
  in (by the same 5 focus steps) before being to capture focus images.

REPOSITORY
  R321 KStars

BRANCH
  improve-linear-backlash (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D26218

AFFECTED FILES
  kstars/ekos/focus/focus.cpp
  kstars/ekos/focus/focus.h
  kstars/ekos/focus/focusalgorithms.cpp

To: murveit, mutlaqja
Cc: kde-edu, narvaez, apol
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