Calculates the squared length of a vector. - Java java.lang

Java examples for java.lang:Math Vector

  1. HOME
  2. Java
  3. java.lang
  4. Math Vector

Description

Calculates the squared length of a vector.

Demo Code


//package com.java2s;

import java.awt.geom.Point2D;

public class Main {
    /**//from w  w  w. j  a v a2s  . c  o  m
     * Calculates the squared length of a vector. This method is much cheaper than
     * {@link #vecLength(Point2D)}.
     * 
     * @param v The vector.
     * @return The squared length.
     */
    public static double vecLengthSqr(final Point2D v) {
        return dot(v, v);
    }

    /**
     * Calculates the dot product of two vectors.
     * 
     * @param a The first vector.
     * @param b The second vector.
     * @return The dot product.
     */
    public static double dot(final Point2D a, final Point2D b) {
        return a.getX() * b.getX() + a.getY() * b.getY();
    }
}

Related Tutorials