public abstract class SpeedCalculator
{
/**
- * Calculate the speed value of the track at the specified index
+ * Calculate the horizontal speed value of the track at the specified index
* @param inTrack track object
* @param inIndex index of point to calculate speed for
* @param inValue object in which to place result of calculation
*/
public static void calculateSpeed(Track inTrack, int inIndex, SpeedValue inValue)
{
- if (inTrack == null || inIndex < 0 || inValue == null) {
+ if (inValue != null)
+ {
+ inValue.setInvalid();
+ }
+ if (inTrack == null || inIndex < 0 || inValue == null)
+ {
System.err.println("Cannot calculate speed for index " + inIndex);
return;
}
- inValue.setInvalid();
DataPoint point = inTrack.getPoint(inIndex);
if (point == null) {return;}
double speedValue = 0.0;
// First, see if point has a speed value already
- // FIXME: How do we know what units this speed is in? m/s or mph or km/h or what?
- String speedStr = point.getFieldValue(Field.SPEED);
- try {
- speedValue = Double.parseDouble(speedStr);
+ if (point.hasHSpeed()) {
+ speedValue = point.getHSpeed().getValue(Config.getUnitSet().getSpeedUnit());
pointHasSpeed = true;
}
- catch (Exception e) {} // ignore, leave pointHasSpeed false
// otherwise, see if we can calculate it from the timestamps
if (!pointHasSpeed && point.hasTimestamp() && !point.isWaypoint())
do
{
p = inTrack.getPoint(index);
- boolean timeOk = p != null && p.hasTimestamp() && !p.getTimestamp().isAfter(point.getTimestamp());
+ boolean timeOk = p != null && p.hasTimestamp() && p.getTimestamp().isBefore(point.getTimestamp());
boolean pValid = timeOk && !p.isWaypoint();
if (pValid) {
totalRadians += DataPoint.calculateRadiansBetween(p, q);
earlyStamp = p.getTimestamp();
}
- stop = (p == null) || (p.hasTimestamp() && !p.getTimestamp().isEqual(point.getTimestamp())
- || p.getSegmentStart());
+
+ stop = (p == null) || p.getSegmentStart() || hasSufficientTimeDifference(p, point);
index--;
if (p != null && !p.isWaypoint()) {
q = p;
totalRadians += DataPoint.calculateRadiansBetween(p, q);
lateStamp = p.getTimestamp();
}
- stop = (p == null) || (p.hasTimestamp() && !p.getTimestamp().isEqual(point.getTimestamp())
- || p.getSegmentStart());
+
+ stop = (p == null) || p.getSegmentStart() || hasSufficientTimeDifference(point, p);
index++;
if (p != null && !p.isWaypoint()) {
q = p;
double speedValue = 0.0;
// First, see if point has a speed value already
- if (point != null)
+ if (point != null && point.hasVSpeed())
{
- // FIXME: Can we assume m/s or ft/s?
- String speedStr = point.getFieldValue(Field.VERTICAL_SPEED);
- try {
- speedValue = Double.parseDouble(speedStr);
- pointHasSpeed = true;
- }
- catch (Exception e) {} // ignore, leave pointHasSpeed false
+ speedValue = point.getVSpeed().getValue(Config.getUnitSet().getVerticalSpeedUnit());
+ pointHasSpeed = true;
}
// otherwise, see if we can calculate it from the heights and timestamps
if (!pointHasSpeed
do
{
p = inTrack.getPoint(index);
- boolean timeOk = p != null && p.hasTimestamp() && !p.getTimestamp().isAfter(point.getTimestamp());
+ boolean timeOk = p != null && p.hasTimestamp() && p.getTimestamp().isBefore(point.getTimestamp());
boolean pValid = timeOk && !p.isWaypoint();
if (pValid) {
earlyStamp = p.getTimestamp();
if (p.hasAltitude()) firstAlt = p.getAltitude();
}
- stop = (p == null) || (p.hasTimestamp() && !p.getTimestamp().isEqual(point.getTimestamp())
- || p.getSegmentStart());
+
+ stop = (p == null) || p.getSegmentStart() || hasSufficientTimeDifference(p, point);
index--;
}
while (!stop);
lateStamp = p.getTimestamp();
if (p.hasAltitude()) lastAlt = p.getAltitude();
}
- stop = (p == null) || (p.hasTimestamp() && !p.getTimestamp().isEqual(point.getTimestamp())
- || p.getSegmentStart());
+
+ stop = (p == null) || p.getSegmentStart() || hasSufficientTimeDifference(point, p);
index++;
}
while (!stop);
inValue.setValue(speedValue);
}
}
+
+ /**
+ * Check whether the time difference between P1 and P2 is sufficiently large
+ * @param inP1 earlier point
+ * @param inP2 later point
+ * @return true if we can stop looking now, found a point early/late enough
+ */
+ private static boolean hasSufficientTimeDifference(DataPoint inP1, DataPoint inP2)
+ {
+ if (inP1 == null || inP2 == null)
+ return true; // we have to give up now
+ if (!inP1.hasTimestamp() || !inP2.hasTimestamp())
+ return false; // keep looking
+ final long MIN_TIME_DIFFERENCE_MS = 1000L;
+ return inP2.getTimestamp().getMillisecondsSince(inP1.getTimestamp()) >= MIN_TIME_DIFFERENCE_MS;
+ }
}