JTS Vividsolutions API: compute First (direct) geodetic problem

Question

I'm using the popular JTS Vividsolutions API for Java. I'm struggling to find if I can perform calculation of the First (direct) geodetic problem with the API. Is there a way to calculate this with this API? It seems that simple one method not exist, but maybe using some combinations of existing methods of that API.

Note - I'm not looking for solutions of implementing the First (direct) geodetic problem algorithm using Java+JTS suite.

Answer 1

I would much rather suggest doing it manually since the math is simple. This will be much faster than using so many potentially complex methods.

public static Point createPointInDistanceAtAngle(Point anchor, 
                                      double distance, double angle) {

    double dx = distance * Math.cos(Math.toRadians(angle));
    double dy = distance * Math.sin(Math.toRadians(angle));

    double x = anchor.getX() + dx;
    double y = anchor.getY() + dy;

    GeometryFactory geometryFactory = new GeometryFactory(); // maybe pass one
    Point point = geometryFactory.createPoint(new Coordinate(x, y));

    return point;
}

Answer 2

Ok, so I found by myself the solution thanks to @user30184 comment.

The key principal is using JTS rotation via Math Transformation.

//my base point
Coordinate ancorPoint = placeCoordinate;
//create orthogonal point in distance of 0.001 arc degrees
Coordinate endingCoordinate = new Coordinate(placeCoordinate.x+0.001, placeCoordinate.y);
//rotate by 90 degrees = pi/2 = 1.57 (radians)
AffineTransform affineTransform = AffineTransform.getRotateInstance(1.57, ancorPoint.x, ancorPoint.y);
MathTransform mathTransform = new AffineTransform2D(affineTransform);
try {
    //save the result "in place" - modify endingCoordinate to save memory
    JTS.transform(endingCoordinate, endingCoordinate, mathTransform);
} catch (Exception e) {}