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:org.getspout.commons.util.FastVector.java

public float angle(Vector other) {
    double dot = dot(other) / (length() * other.length());
    return (float) Math.acos(dot);
}

From source file:com.duy.pascal.interperter.libraries.math.MathLib.java

@PascalMethod(description = "Return inverse cosine")
public double ArcCos(double x) {
    return Math.acos(x);
}

From source file:edu.csun.ecs.cs.multitouchj.ui.utility.PointUtility.java

public static float getAngle(Point point, boolean isCartesianCoordinateSystem) {
    Point targetPoint = new Point(point);
    if (!isCartesianCoordinateSystem) {
        targetPoint.setY((-1 * targetPoint.getY()));
    }/*www  .j a v a2s . c o  m*/

    Point origin = new Point(0.0f, 0.0f);
    float distance = PointUtility.getDistance(origin, targetPoint);
    float deltaX = Math.abs(targetPoint.getX());
    float angle = (float) Math.toDegrees(Math.acos((deltaX / distance)));

    if (targetPoint.getX() > 0.0f) {
        if (targetPoint.getY() > 0.0f) {
            // nothing to do
        } else {
            angle = (360.0f - angle);
        }
    } else {
        if (targetPoint.getY() > 0.0f) {
            angle = (180.0f - angle);
        } else {
            angle = (180.0f + angle);
        }
    }

    return angle;
}

From source file:com.autodomum.daylight.algorithm.DaylightAlgorithm.java

/**
 * Calculate length of the day for a specific day
 * //from   w  w  w  .  j  a v  a 2  s . com
 * @param latitude
 *            the latitude
 * @param day
 *            the day
 * @return time in hours
 */
public double length(double latitude, int day) {

    final double p = Math
            .asin(.39795 * Math.cos(.2163108 + 2 * Math.atan(.9671396 * Math.tan(.00860 * (day - 186)))));

    return (24.0d - (24.0d / Math.PI) * Math
            .acos((Math.sin(0.8333d * Math.PI / 180d) + Math.sin(latitude * Math.PI / 180.0d) * Math.sin(p))
                    / (Math.cos(latitude * Math.PI / 180.0d) * Math.cos(p))));
}

From source file:org.apache.bigtop.bigpetstore.datagenerator.datamodels.inputs.ZipcodeRecord.java

public double distance(ZipcodeRecord other) {
    if (other.getZipcode().equals(zipcode))
        return 0.0;

    Pair<Double, Double> otherCoords = other.getCoordinates();

    double dist = Math.sin(Math.toRadians(coordinates.getLeft()))
            * Math.sin(Math.toRadians(otherCoords.getLeft()))
            + Math.cos(Math.toRadians(coordinates.getLeft())) * Math.cos(Math.toRadians(otherCoords.getLeft()))
                    * Math.cos(Math.toRadians(coordinates.getRight() - otherCoords.getRight()));
    dist = Math.toDegrees(Math.acos(dist)) * 69.09;

    return dist;//  www. j  ava 2  s  .c  om
}

From source file:org.moeaframework.util.tree.NodeTest.java

@Test
public void testAcos() {
    Node node = new Acos().setArgument(0, new Constant(Math.PI / 4.0));

    Assert.assertTrue(//from   w ww  .j  a  v  a2s  .c  o  m
            NumberArithmetic.equals(Math.acos(Math.PI / 4.0), (Number) node.evaluate(new UnusedEnvironment())));
}

From source file:org.apache.bigtop.datagenerators.locations.Location.java

public double distance(Pair<Double, Double> otherCoords) {
    if (Math.abs(coordinates.getLeft() - otherCoords.getLeft()) < 1e-5
            || Math.abs(coordinates.getRight() - otherCoords.getRight()) < 1e-5)
        return 0.0;

    double dist = Math.sin(Math.toRadians(coordinates.getLeft()))
            * Math.sin(Math.toRadians(otherCoords.getLeft()))
            + Math.cos(Math.toRadians(coordinates.getLeft())) * Math.cos(Math.toRadians(otherCoords.getLeft()))
                    * Math.cos(Math.toRadians(coordinates.getRight() - otherCoords.getRight()));
    dist = Math.toDegrees(Math.acos(dist)) * 69.09;

    return dist;//from w  w  w  . ja v  a  2s  .  c om
}

From source file:org.jcurl.model.PathSegment.java

protected PathSegment(boolean isRockCoordinates, double t0, Point2D x0, Point2D v0, final R1R1Function[] c) {
    super(c);//w w w  .  j  av  a2  s.c om
    if (c.length != 3)
        throw new IllegalArgumentException("rock path curve must have 3 dimensions, but had " + c.length);
    this.isRockCoordinates = isRockCoordinates;
    this.rc2wc = new AffineTransform();
    final double vabs = v0.distance(0, 0);
    if (vabs != 0.0)
        rc2wc.rotate(-Math.acos((v0.getX() * 0 + v0.getY() * 1) / vabs), x0.getX(), x0.getY());
    rc2wc.translate(x0.getX(), x0.getY());
    this.t0 = t0;
}

From source file:org.apache.bigtop.bigpetstore.datagenerator.generators.locations.Location.java

public double distance(Pair<Double, Double> otherCoords) {
    double eps = 1e-3;
    if (Math.abs(coordinates.getLeft() - otherCoords.getLeft()) < eps
            && Math.abs(coordinates.getRight() - otherCoords.getRight()) < eps)
        return 0.0;

    double dist = Math.sin(Math.toRadians(coordinates.getLeft()))
            * Math.sin(Math.toRadians(otherCoords.getLeft()))
            + Math.cos(Math.toRadians(coordinates.getLeft())) * Math.cos(Math.toRadians(otherCoords.getLeft()))
                    * Math.cos(Math.toRadians(coordinates.getRight() - otherCoords.getRight()));
    dist = Math.toDegrees(Math.acos(dist)) * 69.09;

    return dist;//from w ww.j a  v  a2 s  . c o m
}

From source file:com.jh.blockcanarydemo.DemoFragment.java

private double compute() {
    double result = 0;
    for (int i = 0; i < 1000000; ++i) {
        result += Math.acos(Math.cos(i));
        result -= Math.asin(Math.sin(i));
    }//from   w w w  .j  a  v  a2  s.co m
    return result;
}