find center point of a polygon in js

Question

I have found a nice example how to find the center point of a polygon (and here in JS):

-> See this jsfiddle example

So, with this polygon

var polygon = [
     {'x':770, 'y':400},
     {'x':529, 'y':643},
     {'x':320, 'y':494},
     {'x':424, 'y':381},
     {'x':459, 'y':369}
];

I should find the center point like so:

var con = new Contour();
    con.pts = polygon;
    document.write(con.centroid)

But con.centroid is undefined.

What am I doing wrong? Thanks in advance!

Answer 1

Here's fixed version: jsfiddle

You've made few mistakes - first of all you've declared Contour and Point after calling them - thus you weren't able to use it. - you called centroid as if it was property and it was a function thus you were missing brackets () after centroid - in return value of centroid function you passed x and y as an Object where function point takes x and y as separate values