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/* *
*
* License: www.highcharts.com/license
*
* */
'use strict';
import H from '../parts/Globals.js';
import '../parts/Utilities.js';
import requiredIndicatorMixin from '../mixins/indicator-required.js';
var isArray = H.isArray,
EMAindicator = H.seriesTypes.ema,
requiredIndicator = requiredIndicatorMixin,
correctFloat = H.correctFloat;
/**
* The DEMA series Type
*
* @private
* @class
* @name Highcharts.seriesTypes.dema
*
* @augments Highcharts.Series
*/
H.seriesType(
'dema',
'ema',
/**
* Normalized average true range indicator (NATR). 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
* @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);
}
);
},
getEMA: function (
yVal,
prevEMA,
SMA,
index,
i,
xVal
) {
return EMAindicator.prototype.calculateEma(
xVal || [],
yVal,
i === undefined ? 1 : i,
this.chart.series[0].EMApercent,
prevEMA,
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 false;
}
// 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
* @apioption series.dema
*/