Java Distance Calculate distAlongRaySquared(double px, double py, double qx, double qy, double rx, double ry)

Description

dist Along Ray Squared

License

Apache License

Declaration

public static double distAlongRaySquared(double px, double py, double qx, double qy, double rx, double ry) 

Method Source Code

//package com.java2s;
/*/*from www. j  a  v a2  s  .  c  o m*/
 * Copyright 2011 Mark McKay
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    public static double distAlongRaySquared(double px, double py, double qx, double qy, double rx, double ry) {
        double sx = px - qx;
        double sy = py - qy;

        double num = dot(sx, sy, rx, ry);
        return num * num / dot(rx, ry, rx, ry);
    }

    public static double dot(double ax, double ay, double bx, double by) {
        return ax * bx + ay * by;
    }

    public static int dot(int ax, int ay, int bx, int by) {
        return ax * bx + ay * by;
    }
}

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