markerHelper.js

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

import * as zrUtil from 'zrender/src/core/util';
import * as numberUtil from '../../util/number';
import {isDimensionStacked} from '../../data/helper/dataStackHelper';

var indexOf = zrUtil.indexOf;

function hasXOrY(item) {
    return !(isNaN(parseFloat(item.x)) && isNaN(parseFloat(item.y)));
}

function hasXAndY(item) {
    return !isNaN(parseFloat(item.x)) && !isNaN(parseFloat(item.y));
}

// Make it simple, do not visit all stacked value to count precision.
// function getPrecision(data, valueAxisDim, dataIndex) {
//     var precision = -1;
//     var stackedDim = data.mapDimension(valueAxisDim);
//     do {
//         precision = Math.max(
//             numberUtil.getPrecision(data.get(stackedDim, dataIndex)),
//             precision
//         );
//         var stackedOnSeries = data.getCalculationInfo('stackedOnSeries');
//         if (stackedOnSeries) {
//             var byValue = data.get(data.getCalculationInfo('stackedByDimension'), dataIndex);
//             data = stackedOnSeries.getData();
//             dataIndex = data.indexOf(data.getCalculationInfo('stackedByDimension'), byValue);
//             stackedDim = data.getCalculationInfo('stackedDimension');
//         }
//         else {
//             data = null;
//         }
//     } while (data);

//     return precision;
// }

function markerTypeCalculatorWithExtent(
    mlType, data, otherDataDim, targetDataDim, otherCoordIndex, targetCoordIndex
) {
    var coordArr = [];

    var stacked = isDimensionStacked(data, targetDataDim, otherDataDim);
    var calcDataDim = stacked
        ? data.getCalculationInfo('stackResultDimension')
        : targetDataDim;

    var value = numCalculate(data, calcDataDim, mlType);

    var dataIndex = data.indicesOfNearest(calcDataDim, value)[0];
    coordArr[otherCoordIndex] = data.get(otherDataDim, dataIndex);
    coordArr[targetCoordIndex] = data.get(targetDataDim, dataIndex);

    // Make it simple, do not visit all stacked value to count precision.
    var precision = numberUtil.getPrecision(data.get(targetDataDim, dataIndex));
    precision = Math.min(precision, 20);
    if (precision >= 0) {
        coordArr[targetCoordIndex] = +coordArr[targetCoordIndex].toFixed(precision);
    }

    return coordArr;
}

var curry = zrUtil.curry;
// TODO Specified percent
var markerTypeCalculator = {
    /**
     * @method
     * @param {module:echarts/data/List} data
     * @param {string} baseAxisDim
     * @param {string} valueAxisDim
     */
    min: curry(markerTypeCalculatorWithExtent, 'min'),
    /**
     * @method
     * @param {module:echarts/data/List} data
     * @param {string} baseAxisDim
     * @param {string} valueAxisDim
     */
    max: curry(markerTypeCalculatorWithExtent, 'max'),

    /**
     * @method
     * @param {module:echarts/data/List} data
     * @param {string} baseAxisDim
     * @param {string} valueAxisDim
     */
    average: curry(markerTypeCalculatorWithExtent, 'average')
};

/**
 * Transform markPoint data item to format used in List by do the following
 * 1. Calculate statistic like `max`, `min`, `average`
 * 2. Convert `item.xAxis`, `item.yAxis` to `item.coord` array
 * @param  {module:echarts/model/Series} seriesModel
 * @param  {module:echarts/coord/*} [coordSys]
 * @param  {Object} item
 * @return {Object}
 */
export function dataTransform(seriesModel, item) {
    var data = seriesModel.getData();
    var coordSys = seriesModel.coordinateSystem;

    // 1. If not specify the position with pixel directly
    // 2. If `coord` is not a data array. Which uses `xAxis`,
    // `yAxis` to specify the coord on each dimension

    // parseFloat first because item.x and item.y can be percent string like '20%'
    if (item && !hasXAndY(item) && !zrUtil.isArray(item.coord) && coordSys) {
        var dims = coordSys.dimensions;
        var axisInfo = getAxisInfo(item, data, coordSys, seriesModel);

        // Clone the option
        // Transform the properties xAxis, yAxis, radiusAxis, angleAxis, geoCoord to value
        item = zrUtil.clone(item);

        if (item.type
            && markerTypeCalculator[item.type]
            && axisInfo.baseAxis && axisInfo.valueAxis
        ) {
            var otherCoordIndex = indexOf(dims, axisInfo.baseAxis.dim);
            var targetCoordIndex = indexOf(dims, axisInfo.valueAxis.dim);

            item.coord = markerTypeCalculator[item.type](
                data, axisInfo.baseDataDim, axisInfo.valueDataDim,
                otherCoordIndex, targetCoordIndex
            );
            // Force to use the value of calculated value.
            item.value = item.coord[targetCoordIndex];
        }
        else {
            // FIXME Only has one of xAxis and yAxis.
            var coord = [
                item.xAxis != null ? item.xAxis : item.radiusAxis,
                item.yAxis != null ? item.yAxis : item.angleAxis
            ];
            // Each coord support max, min, average
            for (var i = 0; i < 2; i++) {
                if (markerTypeCalculator[coord[i]]) {
                    coord[i] = numCalculate(data, data.mapDimension(dims[i]), coord[i]);
                }
            }
            item.coord = coord;
        }
    }
    return item;
}

export function getAxisInfo(item, data, coordSys, seriesModel) {
    var ret = {};

    if (item.valueIndex != null || item.valueDim != null) {
        ret.valueDataDim = item.valueIndex != null
            ? data.getDimension(item.valueIndex) : item.valueDim;
        ret.valueAxis = coordSys.getAxis(dataDimToCoordDim(seriesModel, ret.valueDataDim));
        ret.baseAxis = coordSys.getOtherAxis(ret.valueAxis);
        ret.baseDataDim = data.mapDimension(ret.baseAxis.dim);
    }
    else {
        ret.baseAxis = seriesModel.getBaseAxis();
        ret.valueAxis = coordSys.getOtherAxis(ret.baseAxis);
        ret.baseDataDim = data.mapDimension(ret.baseAxis.dim);
        ret.valueDataDim = data.mapDimension(ret.valueAxis.dim);
    }

    return ret;
}

function dataDimToCoordDim(seriesModel, dataDim) {
    var data = seriesModel.getData();
    var dimensions = data.dimensions;
    dataDim = data.getDimension(dataDim);
    for (var i = 0; i < dimensions.length; i++) {
        var dimItem = data.getDimensionInfo(dimensions[i]);
        if (dimItem.name === dataDim) {
            return dimItem.coordDim;
        }
    }
}

/**
 * Filter data which is out of coordinateSystem range
 * [dataFilter description]
 * @param  {module:echarts/coord/*} [coordSys]
 * @param  {Object} item
 * @return {boolean}
 */
export function dataFilter(coordSys, item) {
    // Alwalys return true if there is no coordSys
    return (coordSys && coordSys.containData && item.coord && !hasXOrY(item))
        ? coordSys.containData(item.coord) : true;
}

export function dimValueGetter(item, dimName, dataIndex, dimIndex) {
    // x, y, radius, angle
    if (dimIndex < 2) {
        return item.coord && item.coord[dimIndex];
    }
    return item.value;
}

export function numCalculate(data, valueDataDim, type) {
    if (type === 'average') {
        var sum = 0;
        var count = 0;
        data.each(valueDataDim, function (val, idx) {
            if (!isNaN(val)) {
                sum += val;
                count++;
            }
        });
        return sum / count;
    }
    else if (type === 'median') {
        return data.getMedian(valueDataDim);
    }
    else {
        // max & min
        return data.getDataExtent(valueDataDim, true)[type === 'max' ? 1 : 0];
    }
}