wwbsr/node_modules/highcharts/es-modules/Stock/Indicators/WMAIndicator.js

/* *
 *
 *  (c) 2010-2020 Kacper Madej
 *
 *  License: www.highcharts.com/license
 *
 *  !!!!!!! SOURCE GETS TRANSPILED BY TYPESCRIPT. EDIT TS FILE ONLY. !!!!!!!
 *
 * */
'use strict';
import U from '../../Core/Utilities.js';
var isArray = U.isArray, seriesType = U.seriesType;
/* eslint-disable valid-jsdoc */
// Utils:
/**
 * @private
 */
function accumulateAverage(points, xVal, yVal, i, index) {
    var xValue = xVal[i], yValue = index < 0 ? yVal[i] : yVal[i][index];
    points.push([xValue, yValue]);
}
/**
 * @private
 */
function weightedSumArray(array, pLen) {
    // The denominator is the sum of the number of days as a triangular number.
    // If there are 5 days, the triangular numbers are 5, 4, 3, 2, and 1.
    // The sum is 5 + 4 + 3 + 2 + 1 = 15.
    var denominator = (pLen + 1) / 2 * pLen;
    // reduce VS loop => reduce
    return array.reduce(function (prev, cur, i) {
        return [null, prev[1] + cur[1] * (i + 1)];
    })[1] / denominator;
}
/**
 * @private
 */
function populateAverage(points, xVal, yVal, i) {
    var pLen = points.length, wmaY = weightedSumArray(points, pLen), wmaX = xVal[i - 1];
    points.shift(); // remove point until range < period
    return [wmaX, wmaY];
}
/* eslint-enable valid-jsdoc */
/**
 * The SMA series type.
 *
 * @private
 * @class
 * @name Highcharts.seriesTypes.wma
 *
 * @augments Highcharts.Series
 */
seriesType('wma', 'sma', 
/**
 * Weighted moving average indicator (WMA). This series requires `linkedTo`
 * option to be set.
 *
 * @sample stock/indicators/wma
 *         Weighted moving average indicator
 *
 * @extends      plotOptions.sma
 * @since        6.0.0
 * @product      highstock
 * @requires     stock/indicators/indicators
 * @requires     stock/indicators/wma
 * @optionparent plotOptions.wma
 */
{
    params: {
        index: 3,
        period: 9
    }
}, 
/**
 * @lends Highcharts.Series#
 */
{
    getValues: function (series, params) {
        var period = params.period, xVal = series.xData, yVal = series.yData, yValLen = yVal ? yVal.length : 0, range = 1, xValue = xVal[0], yValue = yVal[0], WMA = [], xData = [], yData = [], index = -1, i, points, WMAPoint;
        if (xVal.length < period) {
            return;
        }
        // Switch index for OHLC / Candlestick
        if (isArray(yVal[0])) {
            index = params.index;
            yValue = yVal[0][index];
        }
        // Starting point
        points = [[xValue, yValue]];
        // Accumulate first N-points
        while (range !== period) {
            accumulateAverage(points, xVal, yVal, range, index);
            range++;
        }
        // Calculate value one-by-one for each period in visible data
        for (i = range; i < yValLen; i++) {
            WMAPoint = populateAverage(points, xVal, yVal, i);
            WMA.push(WMAPoint);
            xData.push(WMAPoint[0]);
            yData.push(WMAPoint[1]);
            accumulateAverage(points, xVal, yVal, i, index);
        }
        WMAPoint = populateAverage(points, xVal, yVal, i);
        WMA.push(WMAPoint);
        xData.push(WMAPoint[0]);
        yData.push(WMAPoint[1]);
        return {
            values: WMA,
            xData: xData,
            yData: yData
        };
    }
});
/**
 * A `WMA` series. If the [type](#series.wma.type) option is not specified, it
 * is inherited from [chart.type](#chart.type).
 *
 * @extends   series,plotOptions.wma
 * @since     6.0.0
 * @product   highstock
 * @excluding dataParser, dataURL
 * @requires  stock/indicators/indicators
 * @requires  stock/indicators/wma
 * @apioption series.wma
 */
''; // adds doclet above to the transpiled file