src/viewer.js
function( element, location, placement ) {
        var i;

        element = $.getElement( element );
        i = getOverlayIndex( this.currentOverlays, element );

        if ( i >= 0 ) {
            this.currentOverlays[ i ].update( location, placement );
            THIS[ this.hash ].forceRedraw = true;
            /**
             * Raised when an overlay's location or placement changes
             * (see {@link OpenSeadragon.Viewer#updateOverlay}).
             *
             * @event update-overlay
             * @memberof OpenSeadragon.Viewer
             * @type {object}
             * @property {OpenSeadragon.Viewer} eventSource - A reference to the
             * Viewer which raised the event.
             * @property {Element} element
             * @property {OpenSeadragon.Point|OpenSeadragon.Rect} location
             * @property {OpenSeadragon.Placement} placement
             * @property {?Object} userData - Arbitrary subscriber-defined object.
             */
            this.raiseEvent( 'update-overlay', {
                element: element,
                location: location,
                placement: placement
            });
        }
        return this;
    }
function( element, location, placement ) {
        var i;

        element = $.getElement( element );
        i = getOverlayIndex( this.currentOverlays, element );

        if ( i >= 0 ) {
            this.currentOverlays[ i ].update( location, placement );
            THIS[ this.hash ].forceRedraw = true;
            /**
             * Raised when an overlay's location or placement changes
             * (see {@link OpenSeadragon.Viewer#updateOverlay}).
             *
             * @event update-overlay
             * @memberof OpenSeadragon.Viewer
             * @type {object}
             * @property {OpenSeadragon.Viewer} eventSource - A reference to the
             * Viewer which raised the event.
             * @property {Element} element
             * @property {OpenSeadragon.Point|OpenSeadragon.Rect} location
             * @property {OpenSeadragon.Placement} placement
             * @property {?Object} userData - Arbitrary subscriber-defined object.
             */
            this.raiseEvent( 'update-overlay', {
                element: element,
                location: location,
                placement: placement
            });
        }
        return this;
    }
function ( element , location , placement ) { var i ; element = $ . getElement ( element ) ; i = getOverlayIndex ( this . currentOverlays , element ) ; if ( i >= 0 ) { this . currentOverlays [ i ] . update ( location , placement ) ; THIS [ this . hash ] . forceRedraw = true ; /**
             * Raised when an overlay's location or placement changes
             * (see {@link OpenSeadragon.Viewer#updateOverlay}).
             *
             * @event update-overlay
             * @memberof OpenSeadragon.Viewer
             * @type {object}
             * @property {OpenSeadragon.Viewer} eventSource - A reference to the
             * Viewer which raised the event.
             * @property {Element} element
             * @property {OpenSeadragon.Point|OpenSeadragon.Rect} location
             * @property {OpenSeadragon.Placement} placement
             * @property {?Object} userData - Arbitrary subscriber-defined object.
             */ this . raiseEvent ( 'update-overlay' , { element : element , location : location , placement : placement } ) ; } return this ; }
Updates the overlay represented by the reference to the element or
element id moving it to the new location, relative to the new placement.
@method
@param {Element|String} element - A reference to an element or an id for
the element which is overlaid.
@param {OpenSeadragon.Point|OpenSeadragon.Rect} location - The point or
rectangle which will be overlaid. This is a viewport relative location.
@param {OpenSeadragon.Placement} placement - The position of the
viewport which the location coordinates will be treated as relative
to.
@return {OpenSeadragon.Viewer} Chainable.
@fires OpenSeadragon.Viewer.event:update-overlay
Updates the overlay represented by the reference to the element or element id moving it to the new location relative to the new placement .