use of com.graphhopper.routing.util.tour.TourStrategy in project graphhopper by graphhopper.
the class RoundTripRoutingTemplate method lookup.
@Override
public List<QueryResult> lookup(List<GHPoint> points, FlagEncoder encoder) {
if (points.isEmpty())
throw new IllegalStateException("For round trip calculation one point is required");
final double distanceInMeter = ghRequest.getHints().getDouble(RoundTrip.DISTANCE, 10000);
final long seed = ghRequest.getHints().getLong(RoundTrip.SEED, 0L);
final double initialHeading = ghRequest.getHints().getDouble(RoundTrip.HEADING, Double.NaN);
final int roundTripPointCount = Math.min(20, ghRequest.getHints().getInt(Algorithms.ROUND_TRIP + ".points", 2 + (int) (distanceInMeter / 50000)));
final GHPoint start = ghRequest.getPoints().get(0);
TourStrategy strategy = new MultiPointTour(new Random(seed), distanceInMeter, roundTripPointCount, initialHeading);
queryResults = new ArrayList<>(2 + strategy.getNumberOfGeneratedPoints());
EdgeFilter edgeFilter = new DefaultEdgeFilter(encoder);
QueryResult startQR = locationIndex.findClosest(start.lat, start.lon, edgeFilter);
if (!startQR.isValid())
throw new PointNotFoundException("Cannot find point 0: " + start, 0);
queryResults.add(startQR);
GHPoint last = points.get(0);
for (int i = 0; i < strategy.getNumberOfGeneratedPoints(); i++) {
double heading = strategy.getHeadingForIteration(i);
QueryResult result = generateValidPoint(last, strategy.getDistanceForIteration(i), heading, edgeFilter);
if (result == null) {
ghResponse.addError(new IllegalStateException("Could not find a valid point after " + maxRetries + " tries, for the point:" + last));
return Collections.emptyList();
}
last = result.getSnappedPoint();
queryResults.add(result);
}
queryResults.add(startQR);
return queryResults;
}
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