void construct(PlanningSegment seg, WorldLocation origin, HiResDate date) {
// check we have some data
if (date == null || origin == null) return;
double timeTravelledMillis = getSecsTravelled(seg) * 1000;
// ditch the existing items
seg.removeAllElements();
// ok build for this segment
double courseDegs = seg.getCourse();
double courseRads = MWC.Algorithms.Conversions.Degs2Rads(courseDegs);
long timeMillis = date.getDate().getTime();
final long timeStepMillis;
final long ONE_MIN = 60 * 1000;
final long ONE_HOUR = 60 * ONE_MIN;
final long ONE_DAY = 24 * ONE_HOUR;
// use a time step appropriate to how long we're generating the track for
if (timeTravelledMillis <= 4 * ONE_HOUR) timeStepMillis = ONE_MIN;
else if (timeTravelledMillis <= 12 * ONE_HOUR) timeStepMillis = 10 * ONE_MIN;
else if (timeTravelledMillis <= 2 * ONE_DAY) timeStepMillis = 30 * ONE_MIN;
else timeStepMillis = ONE_HOUR;
// now work out how far he will have travelled in a time step
double distPerMinute = getMinuteDelta(seg);
double distPerStep = distPerMinute * (timeStepMillis / ONE_MIN);
WorldVector vec =
new WorldVector(courseRads, new WorldDistance(distPerStep, WorldDistance.METRES), null);
for (long tNow = timeMillis;
tNow <= timeMillis + timeTravelledMillis;
tNow += timeStepMillis) {
HiResDate thisDtg = new HiResDate(tNow);
// ok, do this fix
Fix thisF =
new Fix(thisDtg, origin, courseRads, seg.getSpeed().getValueIn(WorldSpeed.ft_sec) / 3);
// override the depth
thisF.getLocation().setDepth(seg.getDepth().getValueIn(WorldDistance.METRES));
FixWrapper fw = new FixWrapper(thisF);
fw.setColor(seg.getColor());
// and store it
seg.add(fw);
// reset the name, we're not going to use a human generated one
fw.resetName();
// produce a new position
origin = origin.add(vec);
}
}
@Override
double getMinuteDelta(PlanningSegment seg) {
// how far will we travel in time?
double metresPerSec = seg.getSpeed().getValueIn(WorldSpeed.M_sec);
double metresPerMin = metresPerSec * 60d;
double distanceM = metresPerSec * getSecsTravelled(seg);
WorldDistance wd = new WorldDistance(distanceM, WorldDistance.METRES);
seg.setDistanceSilent(new WorldDistance(wd.getValueIn(WorldDistance.NM), WorldDistance.NM));
return metresPerMin;
}
@Override
protected double getSecsTravelled(PlanningSegment seg) {
// how long does it take to travel this distance?
double secsTaken =
seg.getDistance().getValueIn(WorldDistance.METRES)
/ seg.getSpeed().getValueIn(WorldSpeed.M_sec);
// sort out the leg length
seg.setDurationSilent(new Duration(secsTaken, Duration.SECONDS));
return secsTaken;
}
@Override
double getMinuteDelta(PlanningSegment seg) {
// find out how far it travels
double distPerMinute = seg.getSpeed().getValueIn(WorldSpeed.M_sec) * 60d;
return distPerMinute;
}
