Example usage for java.lang StrictMath atan2

Introduction

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

Prototype

public static native 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

public static void main(String[] args) {

    double d1 = 0.6, d2 = 90.00;

    System.out.println("arc tangent value after conversion = " + StrictMath.atan2(d1, d2));

    System.out.println("arc tangent value after conversion = " + StrictMath.atan2(d2, d1));
}

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From source file:org.esa.beam.util.math.FastMathPerformance.java

public void testAtan2() {
    System.gc();//  w  w w . j  a  v  a 2s  .c o m
    double x = 0;
    long time = System.nanoTime();
    for (int i = 0; i < RUNS; i++)
        x += StrictMath.atan2(i * F1, i * F1);
    long strictTime = System.nanoTime() - time;

    System.gc();
    double y = 0;
    time = System.nanoTime();
    for (int i = 0; i < RUNS; i++)
        y += FastMath.atan2(i * F1, i * F1);
    long fastTime = System.nanoTime() - time;

    System.gc();
    double z = 0;
    time = System.nanoTime();
    for (int i = 0; i < RUNS; i++)
        z += Math.atan2(i * F1, i * F1);
    long mathTime = System.nanoTime() - time;

    report("atan2", x + y + z, strictTime, fastTime, mathTime);
}

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