Example usage for java.lang Math atan2

List of usage examples for java.lang Math atan2

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Introduction

In this page you can find the example usage for java.lang Math atan2.

Prototype

@HotSpotIntrinsicCandidate
public static double atan2(double y, double x)

Source Link

Document

Returns the angle theta from the conversion of rectangular coordinates ( x ,  y ) to polar coordinates (r, theta).

Usage

From source file:Main.java

/**
 * Rotate a set of coordinates by a given angle
 * @param c_x//from w  w w  . j  a va  2s .  c  o m
 * @param c_y
 * @param thetab
 * @param x
 * @param y
 * @return
 */
public static double[] rotateCoord(double c_x, double c_y, double thetab, double x, double y) {
    double prc_x = x - c_x;
    double prc_y = y - c_y;
    double r = Math.sqrt(prc_x * prc_x + prc_y * prc_y);
    double theta = Math.atan2(prc_y, prc_x);
    theta = theta + thetab * Math.PI / 180.0;
    double pc_x = r * Math.cos(theta);
    double pc_y = r * Math.sin(theta);
    double p[] = new double[2];
    p[0] = pc_x + c_x;
    p[1] = pc_y + c_y;
    return p;
}

From source file:Main.java

public static double distFrom(double lat1, double lng1, double lat2, double lng2) {
    double earthRadius = 3958.75;
    double dLat = Math.toRadians(lat2 - lat1);
    double dLng = Math.toRadians(lng2 - lng1);
    double a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.cos(Math.toRadians(lat1))
            * Math.cos(Math.toRadians(lat2)) * Math.sin(dLng / 2) * Math.sin(dLng / 2);
    double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
    double dist = earthRadius * c;

    int meterConversion = 1609;

    return dist * meterConversion;
}

From source file:Main.java

public static double distance(double lat1, double lng1, double lat2, double lng2) {
    double earthRadius = 6371000; //meters
    double dLat = Math.toRadians(lat2 - lat1);
    double dLng = Math.toRadians(lng2 - lng1);
    double a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.cos(Math.toRadians(lat1))
            * Math.cos(Math.toRadians(lat2)) * Math.sin(dLng / 2) * Math.sin(dLng / 2);
    double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
    double distance = (double) (earthRadius * c);

    return distance;
}

From source file:Main.java

public static double distFrom(double lat1, double lng1, double lat2, double lng2) {
    double earthRadius = 3958.75;
    double dLat = Math.toRadians(lat2 - lat1);
    double dLng = Math.toRadians(lng2 - lng1);
    double sindLat = Math.sin(dLat / 2);
    double sindLng = Math.sin(dLng / 2);
    double a = Math.pow(sindLat, 2)
            + Math.pow(sindLng, 2) * Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2));
    double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
    double dist = earthRadius * c;

    if (dist >= 1000) {
        int distInInt = (int) dist;
        dist = (int) distInInt;
    } else if (dist >= 100) {
        dist = (((int) (dist * 10)) / 10.0);
    } else {/*from   ww  w .  j ava  2s  .  com*/
        dist = (((int) (dist * 100)) / 100.0);
    }
    return dist;
}

From source file:Main.java

public static void untransformBaidu(double wgLat, double wgLon, double[] latlng) {
    double x = wgLon - 0.0065, y = wgLat - 0.006;
    double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
    double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
    double gg_lon = z * Math.cos(theta);
    double gg_lat = z * Math.sin(theta);
    untransform(gg_lat, gg_lon, latlng);
}

From source file:Main.java

public static Double getDistance(double lat1, double lat2, double lon1, double lon2, double el1, double el2) {

    final int R = 6371; // Radius of the earth

    Double latDistance = Math.toRadians(lat2 - lat1);
    Double lonDistance = Math.toRadians(lon2 - lon1);
    Double a = Math.sin(latDistance / 2) * Math.sin(latDistance / 2) + Math.cos(Math.toRadians(lat1))
            * Math.cos(Math.toRadians(lat2)) * Math.sin(lonDistance / 2) * Math.sin(lonDistance / 2);
    Double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
    double distance = R * c; // convert to meters

    double height = el1 - el2;

    distance = Math.pow(distance, 2) + Math.pow(height, 2);

    return Math.sqrt(distance);
}

From source file:Main.java

public static double getBearing(double lat1, double lng1, double lat2, double lng2) {
    double dLat = Math.toRadians(lat2 - lat1);

    double dLng = Math.toRadians(lng2 - lng1);

    lat1 = Math.toRadians(lat1);//from  w ww  .ja v a2s. c  o  m
    lat2 = Math.toRadians(lat2);

    lng1 = Math.toRadians(lng1);
    lng2 = Math.toRadians(lng2);

    double y = Math.sin(dLng) * Math.cos(lat2);
    double x = Math.cos(lat1) * Math.sin(lat2) - Math.sin(lat1) * Math.cos(lat2) * Math.cos(dLng);
    double brng = Math.toDegrees(Math.atan2(y, x));

    return brng;
}

From source file:Main.java

public static void transformBaidu(double wgLat, double wgLon, double[] latlng) {
    double d[] = new double[2];
    transform(wgLat, wgLon, d);//from ww w. j a v a2  s  .  c  o  m
    double x = d[1], y = d[0];
    double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
    double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
    latlng[1] = z * Math.cos(theta) + 0.0065;
    latlng[0] = z * Math.sin(theta) + 0.006;
}

From source file:Main.java

/**
 * Calculates the distance between two locations in KM
 *///from   w w w .  ja  va  2 s .c om
public static double checkDistance(double lat1, double lng1, double lat2, double lng2) {
    double earthRadius = 6371;

    double dLat = Math.toRadians(lat2 - lat1);
    double dLng = Math.toRadians(lng2 - lng1);

    double sindLat = Math.sin(dLat / 2);
    double sindLng = Math.sin(dLng / 2);

    double a = Math.pow(sindLat, 2)
            + Math.pow(sindLng, 2) * Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2));

    double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));

    double dist = earthRadius * c * 1000;

    return dist; // in meter
}

From source file:Main.java

public static double distanceFrom(double lat1, double lng1, double lat2, double lng2) {
    // Implementation of the Haversine distance formula
    lat1 = Math.toRadians(lat1);//  w  w w. ja v  a  2  s  .  co  m
    lng1 = Math.toRadians(lng1);
    lat2 = Math.toRadians(lat2);
    lng2 = Math.toRadians(lng2);

    double dlon = lng2 - lng1;
    double dlat = lat2 - lat1;

    double a = Math.pow((Math.sin(dlat / 2)), 2)
            + Math.cos(lat1) * Math.cos(lat2) * Math.pow(Math.sin(dlon / 2), 2);
    double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
    return 3958.75 * c; // 3958: Earth radius in miles
}