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I have implemented zoom in by box selection using openlayers 4 , like this

$('#zoomin').click(function () {
        // var currentZoomLevel = map.getView().getZoom();
        //map.getView().setZoom(currentZoomLevel + 1);
        dragBoxInteraction = new ol.interaction.DragBox({
            // condition: ol.events.condition.platformModifierKeyOnly
        });
        map.addInteraction(dragBoxInteraction);
        dragBoxInteraction.on('boxend', function () {           
            var extent = dragBoxInteraction.getGeometry().getExtent();
            map.getView().fit(extent, map.getSize());
            //source.forEachFeatureIntersectingExtent(extent, function (feature) {
            //    console.log(feature);
            //});
        })

    });

I need to implement zoom out by box , i've searched a lot , but no luck with openlayers , by box selection i need to zoom out to the area which user selects

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