How to finds draw extents includes my point extent in openlayers3

i draw a DragBox on openlayers map and when i use drawend event, i can see thats extent. and i have some point on my map. my point is selected in EXTENT want to check whether with using openlayers3 api

draw = new ol.interaction.DragBox({ /* dragbox interaction is active only if alt key is pressed */ condition:, /* style the box */ style: new{ stroke: new{ color: [0, 0, 255, 1] }) }) }); /* add the DragBox interaction to the map */ map.addInteraction(draw); draw.on('boxend', function (evt) { //if(**.isContains(MYPOINT.extent)**) });