The ES1en. atan2 of method in JavaScript USES a detailed explanation

2020-06-15 07:40:12
OfStack

This method returns the inverse tangent of its parameter quotient. The ATAN2 method returns the value between -pi and PI (x,y) points of Angle theta.
grammar


Math.atan2( x, y ) ;

Here is the details of the parameters:

x and y: one number.

The return value:

Returns the inverse tangent of 1 number of radians


Math.atan2(  Plus or minus 0, -0 ) returns  Plus or minus PI.
Math.atan2(  Plus or minus 0, +0 ) returns  Plus or minus 0.
Math.atan2(  Plus or minus 0, -x ) returns  Plus or minus PI for x < 0.
Math.atan2(  Plus or minus 0, x ) returns  Plus or minus 0 for x > 0.
Math.atan2( y,  Plus or minus 0 ) returns -PI/2 for y > 0.
Math.atan2(  Plus or minus y, -Infinity ) returns  Plus or minus PI for finite y > 0.
Math.atan2(  Plus or minus y, +Infinity ) returns  Plus or minus 0 for finite y > 0.
Math.atan2(  Plus or minus Infinity, +x ) returns  Plus or minus PI/2 for finite x.
Math.atan2(  Plus or minus Infinity, -Infinity ) returns  Plus or minus 3*PI/4.
Math.atan2(  Plus or minus Infinity, +Infinity ) returns  Plus or minus PI/4.

Example:


<html>
<head>
<title>JavaScript Math atan2() Method</title>
</head>
<body>
<script type="text/javascript">

var value = Math.atan2(90,15);
document.write("First Test Value : " + value ); 
 
var value = Math.atan2(15,90);
document.write("<br />Second Test Value : " + value ); 

var value = Math.atan2(0, -0);
document.write("<br />Third Test Value : " + value ); 

var value = Math.atan2(+Infinity, -Infinity);
document.write("<br />Fourth Test Value : " + value ); 
</script>
</body>
</html>

This will produce the following results:


First Test Value : 1.4056476493802698
Second Test Value : 0.16514867741462683
Third Test Value : 3.141592653589793
Fourth Test Value : 2.356194490192345