Example usage for java.lang Math PI

Introduction

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

Prototype

double PI

To view the source code for java.lang Math PI.

Click Source Link

Document

The double value that is closer than any other to pi, the ratio of the circumference of a circle to its diameter.

Usage

From source file:Main.java

public static double getAngleByTwoPostion(float[] startPoints, float[] endPoint) {
    double result = 0;

    float xDistance = endPoint[0] - startPoints[0];
    float yDistance = endPoint[1] - startPoints[1];

    result = Math.atan2((double) yDistance, (double) xDistance) * 180 / Math.PI;

    result += 270;// w w  w. ja v  a 2  s . c  o  m

    return result;
}

---

From source file:Main.java

public static void setRotateM(float[] rm, float a, float x, float y, float z) {
    rm[3] = 0;/*from   www. j  a va 2  s . com*/
    rm[7] = 0;
    rm[11] = 0;
    rm[12] = 0;
    rm[13] = 0;
    rm[14] = 0;
    rm[15] = 1;
    a *= (float) (Math.PI / 180.0f);
    float s = (float) Math.sin(a);
    float c = (float) Math.cos(a);
    if (1.0f == x && 0.0f == y && 0.0f == z) {
        rm[5] = c;
        rm[10] = c;
        rm[6] = s;
        rm[9] = -s;
        rm[1] = 0;
        rm[2] = 0;
        rm[4] = 0;
        rm[8] = 0;
        rm[0] = 1;
    } else if (0.0f == x && 1.0f == y && 0.0f == z) {
        rm[0] = c;
        rm[10] = c;
        rm[8] = s;
        rm[2] = -s;
        rm[1] = 0;
        rm[4] = 0;
        rm[6] = 0;
        rm[9] = 0;
        rm[5] = 1;
    } else if (0.0f == x && 0.0f == y && 1.0f == z) {
        rm[0] = c;
        rm[5] = c;
        rm[1] = s;
        rm[4] = -s;
        rm[2] = 0;
        rm[6] = 0;
        rm[8] = 0;
        rm[9] = 0;
        rm[10] = 1;
    } else {
        float len = length(x, y, z);
        if (1.0f != len) {
            float recipLen = 1.0f / len;
            x *= recipLen;
            y *= recipLen;
            z *= recipLen;
        }
        float nc = 1.0f - c;
        float xy = x * y;
        float yz = y * z;
        float zx = z * x;
        float xs = x * s;
        float ys = y * s;
        float zs = z * s;
        rm[0] = x * x * nc + c;
        rm[4] = xy * nc - zs;
        rm[8] = zx * nc + ys;
        rm[1] = xy * nc + zs;
        rm[5] = y * y * nc + c;
        rm[9] = yz * nc - xs;
        rm[2] = zx * nc - ys;
        rm[6] = yz * nc + xs;
        rm[10] = z * z * nc + c;
    }
}

---

From source file:Main.java

/**************************************
 * Math relevant/*from  w ww .j a  v a  2  s  . c o  m*/
 *************************************/

public static double calculatePDFOfNormalDistribution(double mean, double std, double value) {
    double prob = Math.pow(Math.E, -Math.pow(value - mean, 2) / 2 / Math.pow(std, 2))
            / (Math.sqrt(Math.PI * 2) * std);
    if (prob > 1)
        System.out.println(mean + " " + std + " " + value);
    return prob;
}

---

From source file:Main.java

/**
 * conmputes hann window for given size/*from   w ww.ja v  a2  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:fr.ritaly.dungeonmaster.audio.SoundSystem.java

public static void main(String[] args) throws Exception {
    // simpleTest();
    // testClip();

    SoundSystem.getInstance().init(new File("src\\main\\resources\\sound"));

    for (int i = 0; i < 72; i++) {
        SoundSystem.getInstance().play((i * 5.0f / 180.0f) * Math.PI, 1, AudioClip.GLOUPS);

        Thread.sleep(500);/*ww  w .j  a  v a 2s .c  o  m*/
    }

    for (int i = 0; i < 10; i++) {
        SoundSystem.getInstance().play(0, i, AudioClip.GLOUPS);

        Thread.sleep(250);
    }

    // SoundSystem.getInstance().setListener(new AudioListener() {
    // @Override
    // public Position getPosition() {
    // return new Position(0, 2, 0);
    // }
    //
    // @Override
    // public Direction getDirection() {
    // return Direction.NORTH;
    // }
    //
    // @Override
    // public void setDirection(Direction direction) {
    // }
    // });
    //
    // for (int x = 0; x < 4; x++) {
    // for (int y = 0; y < 6; y++) {
    // if (((x == 0) || (x == 1))
    // && ((y == 0) || (y == 5) || (y == 4))) {
    // continue;
    // }
    //
    // if (log.isDebugEnabled()) {
    // log.debug("(x,y) = (" + x + "," + y + ")");
    // }
    //
    // SoundSystem.getInstance().play(new Position(x, y, 0),
    // AudioClip.GLOUPS);
    //
    // Thread.sleep(2000);
    // }
    // }

    // for (int i = 0; i < 10; i++) {
    // switch (RandomUtils.nextInt(3) + 1) {
    // case 1:
    // SoundSystem.getInstance().play(AudioClip.GLOUPS);
    // break;
    // case 2:
    // SoundSystem.getInstance().play(AudioClip.FIRE_BALL);
    // break;
    // case 3:
    // SoundSystem.getInstance().play(AudioClip.CHAMPION_DIED);
    // break;
    // default:
    // break;
    // }
    //
    // Thread.sleep(1000);
    // }

    while (true) {
        /* sleep for 1 second. */
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            // Ignore the exception.
        }

        SoundSystem.getInstance().dispose();
    }
}

---

From source file:Main.java

public static double tile2lat(int y, int aZoom) {

    final double MerkElipsK = 0.0000001;
    final long sradiusa = 6378137;
    final long sradiusb = 6356752;
    final double FExct = (double) Math.sqrt(sradiusa * sradiusa - sradiusb * sradiusb) / sradiusa;
    final int TilesAtZoom = 1 << aZoom;
    double result = (y - TilesAtZoom / 2) / -(TilesAtZoom / (2 * Math.PI));
    result = (2 * Math.atan(Math.exp(result)) - Math.PI / 2) * 180 / Math.PI;
    double Zu = result / (180 / Math.PI);
    double yy = ((y) - TilesAtZoom / 2);

    double Zum1 = Zu;
    Zu = Math.asin(1 - ((1 + Math.sin(Zum1)) * Math.pow(1 - FExct * Math.sin(Zum1), FExct))
            / (Math.exp((2 * yy) / -(TilesAtZoom / (2 * Math.PI)))
                    * Math.pow(1 + FExct * Math.sin(Zum1), FExct)));
    while (Math.abs(Zum1 - Zu) >= MerkElipsK) {
        Zum1 = Zu;//from  ww  w.  j a  v a  2 s  . c om
        Zu = Math.asin(1 - ((1 + Math.sin(Zum1)) * Math.pow(1 - FExct * Math.sin(Zum1), FExct))
                / (Math.exp((2 * yy) / -(TilesAtZoom / (2 * Math.PI)))
                        * Math.pow(1 + FExct * Math.sin(Zum1), FExct)));
    }

    result = Zu * 180 / Math.PI;

    return result;

}

---

From source file:Main.java

public static double distanceTo(double fromLat, double fromLng, double toLat, double toLng) {

    double fromLatRad = calculateRadian(fromLat);
    double fromLngRad = calculateRadian(fromLng);
    double toLatRad = calculateRadian(toLat);
    double toLngRad = calculateRadian(toLng);

    return EARTH_RADIUS * (Math.PI / 2 - Math.asin(Math.sin(fromLatRad) * Math.sin(toLatRad)
            + Math.cos(fromLngRad - toLngRad) * Math.cos(toLatRad) * Math.cos(fromLatRad)));
}

---

From source file:Main.java

/**
 * Converts XY point from Spherical Mercator EPSG:900913 to lat/lon in WGS84
 * Datum/*www  . j  av a2 s  .co  m*/
 * 
 * @return
 */
public static double[] MetersToLatLon(double mx, double my) {

    double lon = (mx / originShift) * 180.0;
    double lat = (my / originShift) * 180.0;

    lat = 180 / Math.PI * (2 * Math.atan(Math.exp(lat * Math.PI / 180.0)) - Math.PI / 2.0);
    return new double[] { lat, lon };
}

---

From source file:Main.java

public static double pixelYToLatitude(int pixelY, double zoomLevel, int tileSize) {
    int mapSize = getMapSize(zoomLevel, tileSize);
    if (pixelY < 0 || pixelY > mapSize) {
        throw new IllegalArgumentException(
                "invalid pixelY coordinate at zoom level " + zoomLevel + ": " + pixelY);
    }/*www  .  j  a  va2s  . co m*/
    double y = .5d - ((double) pixelY / mapSize);
    return 90d - 360d * Math.atan(Math.exp(-y * (2d * Math.PI))) / Math.PI;
}

---

From source file:Main.java

/**
 * Rotate a set of coordinates by a given angle
 * @param c_x/*ww w . j ava2s . 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;
}

---

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