Particles should converge to the center of the rectangle

import haxepunk.Entity;
import haxepunk.HXP;
import haxepunk.Scene;
import haxepunk.graphics.Image;
import haxepunk.graphics.Graphiclist;
import haxepunk.graphics.emitter.StaticEmitter;
import haxepunk.utils.Ease;

class MainScene extends Scene
{
    private var se:StaticEmitter;
    private var e:Entity;

    override public function begin()
    {
        e = new Entity();
        se = new StaticEmitter("graphics/particle.png");
        se.newType("tell");
        se.setMotion("tell", 0, 50, 0.2, 360, 10, 0.1, Ease.sineIn, true);
        var i = Image.createRect(100, 50, 0xff0000);
        i.centerOrigin();
        var g = new Graphiclist();
        g.add(i);
        g.add(se);
        e.graphic = g;

        add(e);
    }

    override public function update()
    {
        super.update();
        se.emit("tell");
        e.x = Math.cos(haxe.Timer.stamp()) * 100 + HXP.halfWidth;
        e.y = Math.sin(haxe.Timer.stamp()) * 100 + HXP.halfHeight;
    }
}