Create a Polygon Handler.
Parameters
| control | {OpenLayers.Control} The control that owns this handler |
| callbacks | {Object} An object with a properties whose values are functions. Various callbacks described below. |
| options | {Object} An optional object with properties to be set on the handler |
Named callbacks
| create | Called when a sketch is first created. Callback called with the creation point geometry and sketch feature. |
| modify | Called with each move of a vertex with the vertex (point) geometry and the sketch feature. |
| point | Called as each point is added. Receives the new point geometry. |
| done | Called when the point drawing is finished. The callback will recieve a single argument, the polygon geometry. |
| cancel | Called when the handler is deactivated while drawing. The cancel callback will receive a geometry. |