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

Description

Points to right of line segment have negative distance.

License

Apache License

Declaration

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

Method Source Code

//package com.java2s;
/*// w  w w .ja va 2  s.  c  om
 * 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 {
    /**
     * Points to right of line segment have negative distance.
     */
    public static double distPointLineSigned(double px, double py, double qx, double qy, double rx, double ry) {
        //Calc eqn of line in Cartesian form

        //Get normal of line
        double magI = 1 / Math.sqrt(rx * rx + ry * ry);
        double nx = -ry * magI;
        double ny = rx * magI;

        double c = -(qx * nx + qy * ny);

        //Eqn of line is a * x + b * y + c = 0, where a == nx and b == ny
        return px * nx + py * ny + c;
    }
}

Related

1. distinctFrom(String string, String other)
2. distL1(double[] h1, double[] h2)
3. distL1(int[] h1, int[] h2)
4. distortion(double[] xvalues, double[] yvalues, int[] include)
5. distpl(double A, double B, double C, double x, double y)
6. distPointLineSquared(double px, double py, double qx, double qy, double rx, double ry)
7. distPointSegmentSquared(double px, double py, double qx, double qy, double rx, double ry)
8. distribution(int[] values)
9. distsimFeaturesException()