                 var cellHeight = params.coordSys.cellHeight;

                    var value = api.value(1);
                    var events = value && value.split('|');

                    if (isNaN(cellPoint[0]) || isNaN(cellPoint[1])) {
                        return;
                    }

                    if (!events) {
                        return {
                            type: 'image',
                            style: {
                                image: './data/hill-Qomolangma.png',
