[CS4/JS]: Draw three touching circles

Question

This little javascript just might be useful; perhaps not for everyone, though 
Select a triangle (either closed or open, doesn't matter; as long as it has exactly 3 anchor points) and run this script. It'll draw three thin-lined circles with their centers on the triangle points, and their radii adjusted so all three of them touch each other.
Copy, paste into a plain text editor -- Adobe's own ESTK Editor is good -- and save into Illustrator's Scripts folder, or anywhere else (but then you'd have to browse for it every time you want to run it). Save as "draw3circles.jsx" -- when saved in Illy's Scripts folder, it'll be visible next time you restart Illustrator.
Select a triangle, run the script. If you don't have a valid selection, it'll do nothing at all.
//DESCRIPTION:Draw Three Touching Circles on a Triangle
// A Jongware Script, 30-Sep-2010
if (app.documents.length > 0 && app.selection.length == 1 && app.selection[0].hasOwnProperty("pathPoints") && app.selection[0].pathPoints.length == 3)
     p1 = new point (app.selection[0].pathPoints[0].anchor);
     p2 = new point (app.selection[0].pathPoints[1].anchor);
     p3 = new point (app.selection[0].pathPoints[2].anchor);
     dc = p1.distance(p2);
     da = p2.distance(p3);
     db = p3.distance(p1);
     ra = da - (da + db + dc)/2;
     rb = db - (da + db + dc)/2;
     rc = dc - (da + db + dc)/2;
     black = new GrayColor(); black.gray = 100;
     if (ra)
          e = app.activeDocument.pathItems.ellipse (p1.y+ra,p1.x-ra,2*ra,2*ra); e.strokeWidth = 0.1; e.strokeColor = black; e.fillColor = NoColor;
     if (rb)
          e = app.activeDocument.pathItems.ellipse (p2.y+rb,p2.x-rb,2*rb,2*rb); e.strokeWidth = 0.1; e.strokeColor = black; e.fillColor = NoColor;
     if (rc)
          e = app.activeDocument.pathItems.ellipse (p3.y+rc,p3.x-rc,2*rc,2*rc); e.strokeWidth = 0.1; e.strokeColor = black; e.fillColor = NoColor;
function point (arr)
     this.x = arr[0];
     this.y = arr[1];
     this.distance = function (pt) { return Math.sqrt ( (this.x-pt.x)*(this.x-pt.x) + (this.y-pt.y)*(this.y-pt.y) ) };

Answer 1

I don't know yet what I might use it for, but it's fun! Give me a couple of hours...
Thanks,
Peter