stella.adapter

Class OffAxisTracker.GuiderLoop

java.lang.Object

java.util.TimerTask

stella.adapter.OffAxisTracker.GuiderLoop

All Implemented Interfaces:

Runnable

Enclosing class:

OffAxisTracker

private class OffAxisTracker.GuiderLoop
extends TimerTask

The timer task that does the actual guiding. If the guider mode was automatic, we are allowed to send back guider-mode change request, which are normal error events. The master mind will as a response stop the guiding in the master mind, thus we do not stop the guiding in this case.

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	cancel If cancel was called lately.
private long	lastsent The time of the last PID query.
private long	start The starting time of the guider loop.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	GuiderLoop() Start a new guider loop and records the start time.

Method Summary

Modifier and Type	Method and Description
private Vector2D	averageAzAltShift(List<Vector2D> shifts) Averages a list of az/alt offsets stored as two-dimensional vectors.
boolean	cancel() Also allow immediate exits in our loop.
private boolean	check(Value v, double above) Check, if the value is non-null, its value is non-null and if this value is higher than the supplied double.
private Vector2D	fromPinholeFits(File fitsfile, GuiderMode mode, Object objid, Point2D shift) Before reducing the entire star field, we try to see if enough signal can be extracted from around the pinhole.
private Vector2D	fromStarField(List<Guiding.RawStar> found, Object objid, Point2D shift)
void	run() First, check if we are running.
private void	writeRecord(DataOutputStream record, double az, double alt) If the record file is non null, write the two doubles as floats into it.

Methods inherited from class java.util.TimerTask

scheduledExecutionTime

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

start

private long start

The starting time of the guider loop.

lastsent

private long lastsent

The time of the last PID query.

cancel

private boolean cancel

If cancel was called lately.

Constructor Detail

GuiderLoop

protected GuiderLoop()

Start a new guider loop and records the start time.

Method Detail

cancel

public boolean cancel()

Also allow immediate exits in our loop.

Overrides:

cancel in class TimerTask

run

public void run()

First, check if we are running. In that case exit immediately. Otherwise take a guider frame, interpret it and apply an offset.

Specified by:

run in interface Runnable

Specified by:

run in class TimerTask

fromPinholeFits

private Vector2D fromPinholeFits(File fitsfile,
                                 GuiderMode mode,
                                 Object objid,
                                 Point2D shift)

Before reducing the entire star field, we try to see if enough signal can be extracted from around the pinhole.

Parameters:

fitsfile -

mode -

objid -

shift -

Returns:

fromStarField

private Vector2D fromStarField(List<Guiding.RawStar> found,
                               Object objid,
                               Point2D shift)

check

private final boolean check(Value v,
                            double above)

Check, if the value is non-null, its value is non-null and if this value is higher than the supplied double.

averageAzAltShift

private Vector2D averageAzAltShift(List<Vector2D> shifts)

Averages a list of az/alt offsets stored as two-dimensional vectors.

writeRecord

private void writeRecord(DataOutputStream record,
                         double az,
                         double alt)

If the record file is non null, write the two doubles as floats into it.