echarts/lib/component/axisPointer/findPointFromSeries.js

A powerful charting and visualization library for browser

    var zrUtil = require('zrender/lib/core/util');
    var modelUtil = require('../../util/model');

    /**
     * @param {Object} finder contains {seriesIndex, dataIndex, dataIndexInside}
     * @param {module:echarts/model/Global} ecModel
     * @return {Object} {point: [x, y], el: ...} point Will not be null.
     */
    module.exports = function (finder, ecModel) {
        var point = [];
        var seriesIndex = finder.seriesIndex;
        var seriesModel;
        if (seriesIndex == null || !(
            seriesModel = ecModel.getSeriesByIndex(seriesIndex)
        )) {
            return {point: []};
        }

        var data = seriesModel.getData();
        var dataIndex = modelUtil.queryDataIndex(data, finder);
        if (dataIndex == null || zrUtil.isArray(dataIndex)) {
            return {point: []};
        }

        var el = data.getItemGraphicEl(dataIndex);
        var coordSys = seriesModel.coordinateSystem;

        if (seriesModel.getTooltipPosition) {
            point = seriesModel.getTooltipPosition(dataIndex) || [];
        }
        else if (coordSys && coordSys.dataToPoint) {
            point = coordSys.dataToPoint(
                data.getValues(
                    zrUtil.map(coordSys.dimensions, function (dim) {
                        return seriesModel.coordDimToDataDim(dim)[0];
                    }), dataIndex, true
                )
            ) || [];
        }
        else if (el) {
            // Use graphic bounding rect
            var rect = el.getBoundingRect().clone();
            rect.applyTransform(el.transform);
            point = [
                rect.x + rect.width / 2,
                rect.y + rect.height / 2
            ];
        }

        return {point: point, el: el};
    };