redraw
The list of callbacks to call immediately before and immediately after performing a redrawn. The callbacks have two arguments: this WorldWindow and the redraw stage, e.g., redrawCallback(worldWindow, stage);. The stage will be either WorldWind.BEFORE_REDRAW or WorldWind.AFTER_REDRAW indicating whether the callback has been called either immediately before or immediately after a redrawn, respectively. Applications may add functions to this array or remove them.