How to use the vott-ct/lib/js/CanvasTools/Interface/ISelectorSettings.SelectionMode.POLYGON function in vott-ct

private onToolbarItemSelected = async (toolbarItem: ToolbarItem): Promise => {
        switch (toolbarItem.props.name) {
            case ToolbarItemName.DrawRectangle:
                this.setState({
                    selectionMode: SelectionMode.RECT,
                    editorMode: EditorMode.Rectangle,
                });
                break;
            case ToolbarItemName.DrawPolygon:
                this.setState({
                    selectionMode: SelectionMode.POLYGON,
                    editorMode: EditorMode.Polygon,
                });
                break;
            case ToolbarItemName.CopyRectangle:
                this.setState({
                    selectionMode: SelectionMode.COPYRECT,
                    editorMode: EditorMode.CopyRect,
                });
                break;
            case ToolbarItemName.SelectCanvas:
                this.setState({
                    selectionMode: SelectionMode.NONE,
                    editorMode: EditorMode.Select,
                });
                break;
            case ToolbarItemName.PreviousAsset: