Example usage for java.lang Math acos

Introduction

In this page you can find the example usage for java.lang Math acos.

Prototype

public static double acos(double a)

Source Link

Document

Returns the arc cosine of a value; the returned angle is in the range 0.0 through pi.

Usage

From source file:Main.java

public static void main(String[] args) {

    double x = Math.PI / 2;

    x = Math.toRadians(x);/*from   ww  w.ja v a2  s .c  o m*/

    System.out.println("Math.acos(" + x + ")=" + Math.acos(x));
}

From source file:TrigonometricDemo.java

public static void main(String[] args) {
    double degrees = 45.0;
    double radians = Math.toRadians(degrees);

    System.out.format("The value of pi is %.4f%n", Math.PI);
    System.out.format("The sine of %.1f degrees is %.4f%n", degrees, Math.sin(radians));
    System.out.format("The cosine of %.1f degrees is %.4f%n", degrees, Math.cos(radians));
    System.out.format("The tangent of %.1f degrees is %.4f%n", degrees, Math.tan(radians));
    System.out.format("The arcsine of %.4f is %.4f degrees %n", Math.sin(radians),
            Math.toDegrees(Math.asin(Math.sin(radians))));
    System.out.format("The arccosine of %.4f is %.4f degrees %n", Math.cos(radians),
            Math.toDegrees(Math.acos(Math.cos(radians))));
    System.out.format("The arctangent of %.4f is %.4f degrees %n", Math.tan(radians),
            Math.toDegrees(Math.atan(Math.tan(radians))));

}

From source file:TrigonometricDemo.java

public static void main(String[] args) {
    double degrees = 45.0;
    double radians = Math.toRadians(degrees);

    System.out.println("The value of pi is " + Math.PI);
    System.out.println("The sine of " + degrees + " is " + Math.sin(radians));
    System.out.println("The cosine of " + degrees + " is " + Math.cos(radians));
    System.out.println("The tangent of " + degrees + " is " + Math.tan(radians));
    System.out.println("The arc sine of " + Math.sin(radians) + " is "
            + Math.toDegrees(Math.asin(Math.sin(radians))) + " degrees");
    System.out.println("The arc cosine of " + Math.cos(radians) + " is "
            + Math.toDegrees(Math.acos(Math.cos(radians))) + " degrees");
    System.out.println("The arc tangent of " + Math.tan(radians) + " is "
            + Math.toDegrees(Math.atan(Math.tan(radians))) + " degrees");
}

From source file:Main.java

public static float acos(double value) {
    return (float) Math.toDegrees(Math.acos(value));
}

From source file:Main.java

public static float acos(float x) {
    return (float) Math.acos(x);
}

From source file:Main.java

public static Map<Double, Double> findAngles(double a, double b, double c) {
    Map<Double, Double> sideToAngleMap = new HashMap<Double, Double>();

    sideToAngleMap.put(a, Math.toDegrees(Math.acos((b * b + c * c - a * a) / (2 * b * c))));
    sideToAngleMap.put(b, Math.toDegrees(Math.acos((a * a + c * c - b * b) / (2 * a * c))));
    sideToAngleMap.put(c, 180 - sideToAngleMap.get(a) - sideToAngleMap.get(b));

    return sideToAngleMap;
}

From source file:Main.java

public static double distance(double lat1, double lon1, double lat2, double lon2) {

    Double theta = lon1 - lon2;/*from  www  .  java  2 s.  co  m*/
    Double dist = (Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2)))
            + (Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.cos(deg2rad(theta)));

    dist = Math.acos(dist);
    dist = rad2deg(dist);
    dist = dist * 60 * 1.1515; // M

    // dist = dist * 1.609344 * 1000; // m
    dist = dist * 1.609344; // km
    // dist = dist * 0.8684; //n

    return dist;
}

From source file:Main.java

public static double GetDistance(double pLatitude1, double pLongitude1, double pLatitude2, double pLongitude2) {
    double vDist = Math.sin(deg2rad(pLatitude1)) * Math.sin(deg2rad(pLatitude2)) + Math.cos(deg2rad(pLatitude1))
            * Math.cos(deg2rad(pLatitude2)) * Math.cos(deg2rad(pLongitude1 - pLongitude2));
    vDist = Math.acos(vDist);
    vDist = rad2deg(vDist);//w ww .  j  ava 2  s .  c  om
    vDist = vDist * 111189.57696;// * 60 * 1.1515 * 1.609344 * 1000;
    return vDist;
}

From source file:Main.java

/**
 * Calculates the angle between two points on a cartesian plane
 */// ww  w. j a v a 2 s  .  c  o  m
public static float getAngle(float center_x, float center_y, float post_x, float post_y) {
    float tmpv_x = post_x - center_x;
    float tmpv_y = post_y - center_y;
    float d = (float) Math.sqrt(tmpv_x * tmpv_x + tmpv_y * tmpv_y);
    float cos = tmpv_x / d;
    float angle = (float) Math.toDegrees(Math.acos(cos));

    angle = (tmpv_y < 0) ? angle * -1 : angle;

    return angle;
}

From source file:Main.java

private static double getDistanceFromXtoY(double lat_a, double lng_a, double lat_b, double lng_b) {
    double pk = 180 / 3.14169;
    double a1 = lat_a / pk;
    double a2 = lng_a / pk;
    double b1 = lat_b / pk;
    double b2 = lng_b / pk;
    double t1 = Math.cos(a1) * Math.cos(a2) * Math.cos(b1) * Math.cos(b2);
    double t2 = Math.cos(a1) * Math.sin(a2) * Math.cos(b1) * Math.sin(b2);
    double t3 = Math.sin(a1) * Math.sin(b1);
    double tt = Math.acos(t1 + t2 + t3);
    return 6366000 * tt;
}