Calculate Angle Between Two Points JavaScript

Find angle between two points javascript

In this blog post I will share angle between two points formula in JavaScript. Let say we have two latitude and longitude points and need to get angle between 2 points. Find the javascript code snippet below :- 

calculate angle between 2 points

<script type="text/javascript">         

            function CalculateAngle() {

           

                var latA='28.998532'; var lngA='77.705612'; //Point A

                var latB='28.685166'; var lngB='77.453613'; //Point B            

             

                var e = Math, ra = e.PI / 180; deg = 180 / e.PI;    

                var x = lngB - lngA;

                var y = lngB - lngA;

                var f = 0;

               

                if (x >= 0 && y >= 0) {

                    y = y * ra; x = x * ra;

                    f = 90 - e.atan(y / x) * deg;

                   

                } else if (x >= 0 && y <= 0) {

                    y = y * ra; x = x * ra;

                    f = 90 + e.abs(e.atan(y / x) * deg);

                   

                } else if (x <= 0 && y <= 0) {

                    y = y * ra; x = x * ra;

                    f = 270 - e.atan(y / x) * deg;

                   

                } else if (x <= 0 && y >= 0) {

                    y = y * ra; x = x * ra;

                    f = 270 + e.abs(e.atan(y / x) * deg);

                }       

                alert("Angle :" + f + " degree" );

            }           

    </script>