Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/** A collection of machine learning utility functions.
 * <p>
 * Copyright (c) 2008 Eric Eaton
 * <p>
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * <p>
 * This program 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 General Public License for more details.
 * <p>
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 * 
 * @author Eric Eaton (EricEaton@umbc.edu) <br>
 *         University of Maryland Baltimore County
 * 
 * @version 0.1
 *
 */

import java.awt.geom.Line2D;
import java.awt.geom.Point2D;

public class Main {
    /** Computes the intersection between two lines. The calculated point is approximate, 
     * since integers are used. If you need a more precise result, use doubles everywhere.
     * Modified from original version (by Alexander Hristov) by Eric Eaton. 
     * (c) 2007 Alexander Hristov. Use Freely (LGPL license). http://www.ahristov.com
     *
     * @param lineA the first line
     * @param lineB the second line
     * @return point where the segments intersect, or null if they don't
     */
    public static Point2D intersection(Line2D lineA, Line2D lineB) {

        Point2D lineAPt1 = lineA.getP1();
        Point2D lineAPt2 = lineA.getP2();
        Point2D lineBPt1 = lineB.getP1();
        Point2D lineBPt2 = lineB.getP2();

        double x1 = lineAPt1.getX();
        double y1 = lineAPt1.getY();
        double x2 = lineAPt2.getX();
        double y2 = lineAPt2.getY();
        double x3 = lineBPt1.getX();
        double y3 = lineBPt1.getY();
        double x4 = lineBPt2.getX();
        double y4 = lineBPt2.getY();

        double d = (x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4);
        if (d == 0)
            return null;

        double xi = ((x3 - x4) * (x1 * y2 - y1 * x2) - (x1 - x2) * (x3 * y4 - y3 * x4)) / d;
        double yi = ((y3 - y4) * (x1 * y2 - y1 * x2) - (y1 - y2) * (x3 * y4 - y3 * x4)) / d;

        return new Point2D.Double(xi, yi);
    }
}