Java Geometry Algorithm nearestColinearPoint(final Line2D segment, final Point2D point)

Description

nearest Colinear Point

License

Open Source License

Declaration

public static Point2D nearestColinearPoint(final Line2D segment, final Point2D point) 

Method Source Code

//package com.java2s;
/*//from   w  w  w  . jav  a 2s  . c  o  m
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 * 
 *    (C) 2001-2008, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 */

import java.awt.geom.Line2D;

import java.awt.geom.Point2D;

public class Main {

    public static Point2D nearestColinearPoint(final Line2D segment, final Point2D point) {
        return nearestColinearPoint(segment.getX1(), segment.getY1(), segment.getX2(), segment.getY2(),
                point.getX(), point.getY());
    }

    public static Point2D nearestColinearPoint(final double x1, final double y1, final double x2, final double y2,
            double x, double y) {
        final double slope = (y2 - y1) / (x2 - x1);
        if (!Double.isInfinite(slope)) {
            final double y0 = (y2 - slope * x2);
            x = ((y - y0) * slope + x) / (slope * slope + 1);
            y = x * slope + y0;
        } else {
            x = x2;
        }
        if (x1 <= x2) {
            if (x < x1)
                x = x1;
            if (x > x2)
                x = x2;
        } else {
            if (x > x1)
                x = x1;
            if (x < x2)
                x = x2;
        }
        if (y1 <= y2) {
            if (y < y1)
                y = y1;
            if (y > y2)
                y = y2;
        } else {
            if (y > y1)
                y = y1;
            if (y < y2)
                y = y2;
        }
        return new Point2D.Double(x, y);
    }
}

Related

1. makeLine(Point2D.Double center, Point2D.Double north, Point2D.Double east)
2. makeNeighbor(Point theHex, int direction)
3. manhattanDistance(Point a, Point b)
4. mirrorMoveVertically(Point move, int size)
5. nearestColinearPoint(final double x1, final double y1, final double x2, final double y2, double x, double y)
6. nearestPointOnLine(Line2D l, Point2D p, boolean clampToSegment, Point2D dest)
7. newZeroPoint()
8. oneThirdPoint(@Nonnull Point2D pA, @Nonnull Point2D pB)
9. parabolaByFocusAndDirectrix(Point2D.Double focus, double directrix)