/**
* Compute the projection of a point onto the line determined by this line segment.
*
* <p>Note that the projected point may lie outside the line segment. If this is the case, the
* projection factor will lie outside the range [0.0, 1.0].
*/
public Coordinate project(Coordinate p) {
if (p.equals(p0) || p.equals(p1)) return new Coordinate(p);
double r = projectionFactor(p);
Coordinate coord = new Coordinate();
coord.x = p0.x + r * (p1.x - p0.x);
coord.y = p0.y + r * (p1.y - p0.y);
return coord;
}
/**
* Computes the {@link Coordinate} that lies a given fraction along the line defined by this
* segment. A fraction of <code>0.0</code> returns the start point of the segment; a fraction of
* <code>1.0</code> returns the end point of the segment. If the fraction is < 0.0 or > 1.0 the
* point returned will lie before the start or beyond the end of the segment.
*
* @param segmentLengthFraction the fraction of the segment length along the line
* @return the point at that distance
*/
public Coordinate pointAlong(double segmentLengthFraction) {
Coordinate coord = new Coordinate();
coord.x = p0.x + segmentLengthFraction * (p1.x - p0.x);
coord.y = p0.y + segmentLengthFraction * (p1.y - p0.y);
return coord;
}