Example usage for java.lang Math sqrt

Introduction

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

Prototype

@HotSpotIntrinsicCandidate
public static double sqrt(double a)

Source Link

Document

Returns the correctly rounded positive square root of a double value.

Usage

From source file:Main.java

public static float dist(float x1, float y1, float x2, float y2) {
    final float x = (x2 - x1);
    final float y = (y2 - y1);
    return (float) Math.sqrt(x * x + y * y);
}

From source file:Main.java

public static double squareRoot(double val, int n) {
    double retVal = Math.sqrt(val);

    if (n > 1) {
        //recursion
        retVal = squareRoot(retVal, n - 1);
    }//ww  w  . j  a  v  a2 s.c  om

    return retVal;
}

From source file:Snippet134.java

static int[] circle(int r, int offsetX, int offsetY) {
    int[] polygon = new int[8 * r + 4];
    // x^2 + y^2 = r^2
    for (int i = 0; i < 2 * r + 1; i++) {
        int x = i - r;
        int y = (int) Math.sqrt(r * r - x * x);
        polygon[2 * i] = offsetX + x;/*w w  w.j  av  a2  s  .c o m*/
        polygon[2 * i + 1] = offsetY + y;
        polygon[8 * r - 2 * i - 2] = offsetX + x;
        polygon[8 * r - 2 * i - 1] = offsetY - y;
    }
    return polygon;
}

From source file:Main.java

public static float mag(float a, float b, float c) {
    return (float) Math.sqrt(a * a + b * b + c * c);
}

From source file:Main.java

private static double transformLon(double x, double y) {
    double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
    ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
    ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
    ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;

    return ret;//from   ww  w .  j  a  v  a2s .com
}

From source file:Main.java

private static double transformLat(double x, double y) {
    double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
    ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
    ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
    ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;

    return ret;//from w w w . ja  va2  s .c om
}

From source file:Main.java

public static double transformlng(double lng, double lat) {
    double ret = 300.0 + lng + 2.0 * lat + 0.1 * lng * lng + 0.1 * lng * lat + 0.1 * Math.sqrt(Math.abs(lng));
    ret += (20.0 * Math.sin(6.0 * lng * pi) + 20.0 * Math.sin(2.0 * lng * pi)) * 2.0 / 3.0;
    ret += (20.0 * Math.sin(lng * pi) + 40.0 * Math.sin(lng / 3.0 * pi)) * 2.0 / 3.0;
    ret += (150.0 * Math.sin(lng / 12.0 * pi) + 300.0 * Math.sin(lng / 30.0 * pi)) * 2.0 / 3.0;
    return ret;//from  www  .j  a v a 2 s .  c  om
}

From source file:Main.java

public static float easeInOut(float n) {
    double q = 0.48f - n / DURATION / 1.04f, Q = Math.sqrt(0.1734f + q * q), x = Q - q,
            X = Math.pow(Math.abs(x), 1 / 3) * (x < 0 ? -1 : 1), y = -Q - q,
            Y = Math.pow(Math.abs(y), 1 / 3) * (y < 0 ? -1 : 1), t = X + Y + 0.5f;
    return (float) (DOMAIN * ((1 - t) * 3 * t * t + t * t * t) + START);
}

From source file:Main.java

public static double distanceSquared(int x1, int y1, int x2, int y2) {
    int dx = x1 - x2;
    int dy = y1 - y2;

    return Math.sqrt((dx * dx) + (dy * dy));
}

From source file:Main.java

private static int computeInitialSampleSize(BitmapFactory.Options options, int minSideLength,
        int maxNumOfPixels) {
    double w = options.outWidth;
    double h = options.outHeight;
    int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math.sqrt(w * h / maxNumOfPixels));
    int upperBound = (minSideLength == -1) ? 128
            : (int) Math.min(Math.floor(w / minSideLength), Math.floor(h / minSideLength));
    if (upperBound < lowerBound) {
        // return the larger one when there is no overlapping zone.
        return lowerBound;
    }/*from  ww w.ja va  2  s .  c  o m*/
    if ((maxNumOfPixels == -1) && (minSideLength == -1)) {
        return 1;
    } else if (minSideLength == -1) {
        return lowerBound;
    } else {
        return upperBound;
    }
}