[flashmaestro] EXPRESION QUE NO ENTIENDO

[Jesus Alonso]

HOLA, EN ESTE CODIGO.......


        onClipEvent (load) {
                 x = _x;
                 y = _y;
                 f = 0.8;
                 r = 0.3;
                 fscommand ("allowscale", 0);
        }
        onClipEvent (enterFrame) {
                 if (!drag) {
                        this._x += (xvel=xvel*f+(x-_x)*r);
                                this._y += (yvel=yvel*f+(y-_y)*r);
                }
        }


�QUIEN ME PODRIA EXPLICAR LAS EXPRESIONES

                this._x += (xvel=xvel*f+(x-_x)*r);
                this._y += (yvel=yvel*f+(y-_y)*r); ?
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