MathUtils.java

package utils;

import java.util.Random;

/**
 * Created by egor on 19.04.15.
 */
public class MathUtils {
    public static Random rand = new Random();

    public static double distance(double x1, double y1, double x2, double y2) {
        return length(x2 - x1, y2 - y1);
    }

    public static double length(double dx, double dy) {
        return squareSqrt(dx, dy);
    }

    public static boolean isAngleBetween(double alpha, double lim1, double lim2) {
        return (lim2 >= lim1) == ((alpha > lim1) != (alpha > lim2));
    }

    public static double normAngle(double x) {
        while (x >= 2 * Math.PI) x -= 2 * Math.PI;
        while (x < 0) x += 2 * Math.PI;
        return x;
    }

    public static double shortDouble(double a) {
        return Math.floor(16 * a) / 16;
    }

    public static double squareSqrt(double... values) {
        double result = 0;
        for (double value : values) {
            result += Math.pow(value, 2);
        }
        return Math.sqrt(result);
    }
}