Two very simple operations that you may have to deal with if writing a JavaScript that deals with trigonometry are Math.degrees()
and Math.radians()
. These function can be easily defined as follows:
// Converts from degrees to radians.
Math.radians = function(degrees) {
return degrees * Math.PI / 180;
};
// Converts from radians to degrees.
Math.degrees = function(radians) {
return radians * 180 / Math.PI;
};
The name of these functions indicates the end result. Using the above definitions, you could run code such as the following to get the results indicated in the comments:
alert(Math.radians(90)); // 1.5707963267948966
alert(Math.radians(180)); // 3.141592653589793
alert(Math.degrees(1.5707963267948966)); // 90
alert(Math.degrees(3.141592653589793)); // 180
These two functions are now available in YourJS:
I figured if it is available in a language like Python, it might as well be available in the best scripting language, JavaScript!!! 😎
7 Comments
Javier Roman · May 24, 2014 at 3:29 PM
I thought I had this down, but I had the ratio multipliers flipped. Thanks for clarifying this so simply! I bookmarked ya.
idk · June 25, 2014 at 4:29 AM
maybe,
Math.prototype.radians = function(degrees) {}
?
Les · September 1, 2015 at 5:46 PM
Thanks for that, not the math but so obvious thing like adding it to the Math object once, then use forever 🙂
Tori · April 18, 2016 at 6:00 AM
Thank you for clarifying this for me. Everywhere else I looked made it sound so complicated and confusing.
Noitidart · April 23, 2016 at 6:45 AM
Very useful. I am making a html5 drawing application so was drawing triangles and arrows and other shapes. This came in handy! Thank you!
Frank · June 8, 2016 at 12:55 PM
This helped me out with something I was working on… thank you!
Jacob · October 23, 2018 at 7:49 PM
This turned out to be much simpler than expected.
Thank you!