A brief example on how to attach a AutoCAD 2006 Field to a Hatch object. This will result in a Field that will update when the Hatch boundary is modified. It is a perfect way to keep track of areas of rooms, brick, pavement, or perhaps the surface area of a heating surface of a heat exchanger.
In this example I show how to attach the Field to the brick hatch for a patio.
Now in the Field dialog select Object and then use the Select option to select the Hatch. After selecting the Hatch set the property to Area and then your desired precision. Now place the Field text where you want it to display the area.
I like to set the Field (which is really just some dynamic Mtext) to have a background mask the same color as the drawing background for a nice clean look.
You can use this same technique for attaching fields to other objects such as showing the length of a polyline.