public Coordinate getCoordOnEdge(Vector obsPoint) {
if (this == InferredEdge.emptyEdge) return null;
final Coordinate revObsPoint = new Coordinate(obsPoint.getElement(1), obsPoint.getElement(0));
final LinearLocation here = locationIndexedLine.project(revObsPoint);
final Coordinate pointOnLine = locationIndexedLine.extractPoint(here);
final Coordinate revOnLine = new Coordinate(pointOnLine.y, pointOnLine.x);
return revOnLine;
}
/** Splits the input geometry into two LineStrings at a fraction of the distance covered. */
public static P2<LineString> splitGeometryAtFraction(Geometry geometry, double fraction) {
LineString empty = new LineString(null, gf);
Coordinate[] coordinates = geometry.getCoordinates();
CoordinateSequence sequence = gf.getCoordinateSequenceFactory().create(coordinates);
LineString total = new LineString(sequence, gf);
if (coordinates.length < 2) return new P2<LineString>(empty, empty);
if (fraction <= 0) return new P2<LineString>(empty, total);
if (fraction >= 1) return new P2<LineString>(total, empty);
double totalDistance = total.getLength();
double requestedDistance = totalDistance * fraction;
// An index in JTS can actually refer to any point along the line. It is NOT an array index.
LocationIndexedLine line = new LocationIndexedLine(geometry);
LinearLocation l = LengthLocationMap.getLocation(geometry, requestedDistance);
LineString beginning = (LineString) line.extractLine(line.getStartIndex(), l);
LineString ending = (LineString) line.extractLine(l, line.getEndIndex());
return new P2<LineString>(beginning, ending);
}
/**
* Calculates the width of a point if it is not set in the gaf file.<br>
* For PP points, it is just the distance to the first point.<br>
* For non-pp points, it is the station of the point projected to the pp-line.
*/
private BigDecimal getOrCalculatePoint(
final GafPart gafPart, final GafPoint gafPoint, final GafPart projectionPart) {
final BigDecimal width = gafPoint.getWidth();
if (width != null) return width;
final com.vividsolutions.jts.geom.Point location = gafPoint.getPoint();
if (GafKind.P.equals(gafPart.getKind()) || projectionPart == null) {
return calculateWidthFromDistance(gafPart, location);
} else {
final Geometry line = projectionPart.getLine(m_dbType);
if (!(line instanceof LineString) || line.getNumPoints() < 2)
return calculateWidthFromDistance(gafPart, location);
final LineString ls = (LineString) line;
final LocationIndexedLine lineRef = new LocationIndexedLine(line);
final LinearLocation loc = lineRef.project(location.getCoordinate());
final Coordinate closestPt = loc.getCoordinate(line);
final double distance = ls.getCoordinateN(0).distance(closestPt);
return new BigDecimal(distance).setScale(3, BigDecimal.ROUND_HALF_UP);
}
}
/** Splits the input geometry into two LineStrings at the given point. */
public static P2<LineString> splitGeometryAtPoint(Geometry geometry, Coordinate nearestPoint) {
// An index in JTS can actually refer to any point along the line. It is NOT an array index.
LocationIndexedLine line = new LocationIndexedLine(geometry);
LinearLocation l = line.indexOf(nearestPoint);
LineString beginning = (LineString) line.extractLine(line.getStartIndex(), l);
LineString ending = (LineString) line.extractLine(l, line.getEndIndex());
return new P2<LineString>(beginning, ending);
}
/**
* Get the snapped location in projected/euclidean coordinates for the given obsPoint (in
* lat/lon).
*
* @param obsPoint
* @return
*/
public Vector getPointOnEdge(Coordinate obsPoint) {
if (this == InferredEdge.emptyEdge) return null;
final LinearLocation here = locationIndexedLine.project(obsPoint);
final Coordinate pointOnLine = locationIndexedLine.extractPoint(here);
return VectorFactory.getDefault().createVector2D(pointOnLine.x, pointOnLine.y);
}
