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

You call the Contour constructor way before the Contour prototype has been defined. In the said jsfiddle, move your document.write to the end, and all will go… better.

Also, you need to actually call the centroid function you defined:

var c = con.centroid();
document.write( c.x );
document.write( c.y );