Example usage for java.lang Math cos

Introduction

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

Prototype

@HotSpotIntrinsicCandidate
public static double cos(double a)

Source Link

Document

Returns the trigonometric cosine of an angle.

Usage

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[] bd_encrypt(double gg_lat, double gg_lon) {

    double x = gg_lon, y = gg_lat;
    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 bd_lon = z * Math.cos(theta) + 0.0065;
    double bd_lat = z * Math.sin(theta) + 0.006;

    return new double[] { bd_lon, bd_lat };
}

From source file:Main.java

public static double[] getGaoDePos(double[] baiDu) {
    double X_PI = 3.14159265358979324 * 3000.0 / 180.0;
    double x = baiDu[0] - 0.0065, y = baiDu[1] - 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[] gaode = new double[2];
    gaode[0] = z * Math.cos(theta);
    gaode[1] = z * Math.sin(theta);
    return gaode;
}

From source file:Main.java

public static double[] bd_decrypt(double bd_lat, double bd_lon) {
    double x = bd_lon - 0.0065, y = bd_lat - 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);
    return new double[] { gg_lon, gg_lat };
}

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;
}

From source file:Main.java

public static PointF rotatePoint(PointF point, PointF centerPoint, float rotate) {
    float x = point.x;
    float y = point.y;
    float sinA = (float) Math.sin(Math.toRadians(rotate));
    float cosA = (float) Math.cos(Math.toRadians(rotate));
    float newX = centerPoint.x + (x - centerPoint.x) * cosA - (y - centerPoint.y) * sinA;
    float newY = centerPoint.y + (y - centerPoint.y) * cosA + (x - centerPoint.x) * sinA;
    return new PointF(newX, newY);
}

From source file:Main.java

/**
 * conmputes hann window for given size//from   w  w  w .  j av a  2 s. c om
 *
 * @param n the length of the window
 * @return a Hann window as double[]
 */
public static double[] getHannWindow(int n) {

    double[] hann = new double[n];
    for (int i = 0; i < n; i++) {
        hann[i] = 0.5 * (1 - Math.cos((2.0 * Math.PI * i) / (n - 1)));
    }
    return hann;

}

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);//  w  w w .  j  ava2s .  co 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;
}