In OpenLayers 2, I could easily create a Control to draw an ellipse like this:

           new OpenLayers.Control.DrawFeature(layer, OpenLayers.Handler.RegularPolygon, {
                handlerOptions: {
                    sides: 40,
                    irregular: true


In OpenLayers 4, as I assume, it must be done like this:

            new ol.interaction.Draw({
                source: source,
                type: 'Circle',
                geometryFunction: geometryFunctionThatCreatesEllipse

Am I right and if yes, how does the geometryFunctionThatCreatesEllipse look like?

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