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

/* *
 *
 *  License: www.highcharts.com/license
 *
 *  !!!!!!! SOURCE GETS TRANSPILED BY TYPESCRIPT. EDIT TS FILE ONLY. !!!!!!!
 *
 * */
'use strict';
import H from '../../Core/Globals.js';
import U from '../../Core/Utilities.js';
var correctFloat = U.correctFloat, isArray = U.isArray, seriesType = U.seriesType;
import requiredIndicator from '../../Mixins/IndicatorRequired.js';
var EMAindicator = H.seriesTypes.ema;
/**
 * The DEMA series Type
 *
 * @private
 * @class
 * @name Highcharts.seriesTypes.dema
 *
 * @augments Highcharts.Series
 */
seriesType('dema', 'ema', 
/**
 * Double exponential moving average (DEMA) indicator. This series requires
 * `linkedTo` option to be set and should be loaded after the
 * `stock/indicators/indicators.js` and `stock/indicators/ema.js`.
 *
 * @sample {highstock} stock/indicators/dema
 *         DEMA indicator
 *
 * @extends      plotOptions.ema
 * @since        7.0.0
 * @product      highstock
 * @excluding    allAreas, colorAxis, compare, compareBase, joinBy, keys,
 *               navigatorOptions, pointInterval, pointIntervalUnit,
 *               pointPlacement, pointRange, pointStart, showInNavigator,
 *               stacking
 * @requires     stock/indicators/indicators
 * @requires     stock/indicators/ema
 * @requires     stock/indicators/dema
 * @optionparent plotOptions.dema
 */
{}, 
/**
 * @lends Highcharts.Series#
 */
{
    init: function () {
        var args = arguments, ctx = this;
        requiredIndicator.isParentLoaded(EMAindicator, 'ema', ctx.type, function (indicator) {
            indicator.prototype.init.apply(ctx, args);
            return;
        });
    },
    getEMA: function (yVal, prevEMA, SMA, index, i, xVal) {
        return EMAindicator.prototype.calculateEma(xVal || [], yVal, typeof i === 'undefined' ? 1 : i, this.chart.series[0].EMApercent, prevEMA, typeof index === 'undefined' ? -1 : index, SMA);
    },
    getValues: function (series, params) {
        var period = params.period, doubledPeriod = 2 * period, xVal = series.xData, yVal = series.yData, yValLen = yVal ? yVal.length : 0, index = -1, accumulatePeriodPoints = 0, SMA = 0, DEMA = [], xDataDema = [], yDataDema = [], EMA = 0, 
        // EMA(EMA)
        EMAlevel2, 
        // EMA of previous point
        prevEMA, prevEMAlevel2, 
        // EMA values array
        EMAvalues = [], i, DEMAPoint;
        series.EMApercent = (2 / (period + 1));
        // Check period, if bigger than EMA points length, skip
        if (yValLen < 2 * period - 1) {
            return;
        }
        // Switch index for OHLC / Candlestick / Arearange
        if (isArray(yVal[0])) {
            index = params.index ? params.index : 0;
        }
        // Accumulate first N-points
        accumulatePeriodPoints =
            EMAindicator.prototype.accumulatePeriodPoints(period, index, yVal);
        // first point
        SMA = accumulatePeriodPoints / period;
        accumulatePeriodPoints = 0;
        // Calculate value one-by-one for each period in visible data
        for (i = period; i < yValLen + 2; i++) {
            if (i < yValLen + 1) {
                EMA = this.getEMA(yVal, prevEMA, SMA, index, i)[1];
                EMAvalues.push(EMA);
            }
            prevEMA = EMA;
            // Summing first period points for EMA(EMA)
            if (i < doubledPeriod) {
                accumulatePeriodPoints += EMA;
            }
            else {
                // Calculate DEMA
                // First DEMA point
                if (i === doubledPeriod) {
                    SMA = accumulatePeriodPoints / period;
                }
                EMA = EMAvalues[i - period - 1];
                EMAlevel2 = this.getEMA([EMA], prevEMAlevel2, SMA)[1];
                DEMAPoint = [
                    xVal[i - 2],
                    correctFloat(2 * EMA - EMAlevel2)
                ];
                DEMA.push(DEMAPoint);
                xDataDema.push(DEMAPoint[0]);
                yDataDema.push(DEMAPoint[1]);
                prevEMAlevel2 = EMAlevel2;
            }
        }
        return {
            values: DEMA,
            xData: xDataDema,
            yData: yDataDema
        };
    }
});
/**
 * A `DEMA` series. If the [type](#series.ema.type) option is not
 * specified, it is inherited from [chart.type](#chart.type).
 *
 * @extends   series,plotOptions.ema
 * @since     7.0.0
 * @product   highstock
 * @excluding allAreas, colorAxis, compare, compareBase, dataParser, dataURL,
 *            joinBy, keys, navigatorOptions, pointInterval, pointIntervalUnit,
 *            pointPlacement, pointRange, pointStart, showInNavigator, stacking
 * @requires  stock/indicators/indicators
 * @requires  stock/indicators/ema
 * @requires  stock/indicators/dema
 * @apioption series.dema
 */
''; // adds doclet above to the transpiled file