highcharts
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JavaScript charting framework
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JavaScript
/* *
*
* License: www.highcharts.com/license
*
* !!!!!!! SOURCE GETS TRANSPILED BY TYPESCRIPT. EDIT TS FILE ONLY. !!!!!!!
*
* */
;
import SeriesRegistry from '../../../Core/Series/SeriesRegistry.js';
const { ema: EMAIndicator } = SeriesRegistry.seriesTypes;
import U from '../../../Core/Utilities.js';
const { correctFloat, isArray, merge } = U;
/* *
*
* Class
*
* */
/**
* The TEMA series type.
*
* @private
* @class
* @name Highcharts.seriesTypes.tema
*
* @augments Highcharts.Series
*/
class TEMAIndicator extends EMAIndicator {
/* *
*
* Functions
*
* */
getEMA(yVal, prevEMA, SMA, index, i, xVal) {
return super.calculateEma(xVal || [], yVal, typeof i === 'undefined' ? 1 : i, this.EMApercent, prevEMA, typeof index === 'undefined' ? -1 : index, SMA);
}
getTemaPoint(xVal, tripledPeriod, EMAlevels, i) {
const TEMAPoint = [
xVal[i - 3],
correctFloat(3 * EMAlevels.level1 -
3 * EMAlevels.level2 + EMAlevels.level3)
];
return TEMAPoint;
}
getValues(series, params) {
const period = params.period, doubledPeriod = 2 * period, tripledPeriod = 3 * period, xVal = series.xData, yVal = series.yData, yValLen = yVal ? yVal.length : 0, tema = [], xDataTema = [], yDataTema = [],
// EMA values array
emaValues = [], emaLevel2Values = [],
// This object contains all EMA EMAlevels calculated like below
// EMA = level1
// EMA(EMA) = level2,
// EMA(EMA(EMA)) = level3,
emaLevels = {};
let index = -1, accumulatePeriodPoints = 0, sma = 0,
// EMA of previous point
prevEMA, prevEMAlevel2, i, temaPoint;
this.EMApercent = (2 / (period + 1));
// Check period, if bigger than EMA points length, skip
if (yValLen < 3 * period - 2) {
return;
}
// Switch index for OHLC / Candlestick / Arearange
if (isArray(yVal[0])) {
index = params.index ? params.index : 0;
}
// Accumulate first N-points
accumulatePeriodPoints = super.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 + 3; i++) {
if (i < yValLen + 1) {
emaLevels.level1 = this.getEMA(yVal, prevEMA, sma, index, i)[1];
emaValues.push(emaLevels.level1);
}
prevEMA = emaLevels.level1;
// Summing first period points for ema(ema)
if (i < doubledPeriod) {
accumulatePeriodPoints += emaLevels.level1;
}
else {
// Calculate dema
// First dema point
if (i === doubledPeriod) {
sma = accumulatePeriodPoints / period;
accumulatePeriodPoints = 0;
}
emaLevels.level1 = emaValues[i - period - 1];
emaLevels.level2 = this.getEMA([emaLevels.level1], prevEMAlevel2, sma)[1];
emaLevel2Values.push(emaLevels.level2);
prevEMAlevel2 = emaLevels.level2;
// Summing first period points for ema(ema(ema))
if (i < tripledPeriod) {
accumulatePeriodPoints += emaLevels.level2;
}
else {
// Calculate tema
// First tema point
if (i === tripledPeriod) {
sma = accumulatePeriodPoints / period;
}
if (i === yValLen + 1) {
// Calculate the last ema and emaEMA points
emaLevels.level1 = emaValues[i - period - 1];
emaLevels.level2 = this.getEMA([emaLevels.level1], prevEMAlevel2, sma)[1];
emaLevel2Values.push(emaLevels.level2);
}
emaLevels.level1 = emaValues[i - period - 2];
emaLevels.level2 = emaLevel2Values[i - 2 * period - 1];
emaLevels.level3 = this.getEMA([emaLevels.level2], emaLevels.prevLevel3, sma)[1];
temaPoint = this.getTemaPoint(xVal, tripledPeriod, emaLevels, i);
// Make sure that point exists (for TRIX oscillator)
if (temaPoint) {
tema.push(temaPoint);
xDataTema.push(temaPoint[0]);
yDataTema.push(temaPoint[1]);
}
emaLevels.prevLevel3 = emaLevels.level3;
}
}
}
return {
values: tema,
xData: xDataTema,
yData: yDataTema
};
}
}
/* *
*
* Static Properties
*
* */
/**
* Triple exponential moving average (TEMA) indicator. This series requires
* `linkedTo` option to be set and should be loaded after the
* `stock/indicators/indicators.js`.
*
* @sample {highstock} stock/indicators/tema
* TEMA 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/tema
* @optionparent plotOptions.tema
*/
TEMAIndicator.defaultOptions = merge(EMAIndicator.defaultOptions);
SeriesRegistry.registerSeriesType('tema', TEMAIndicator);
/* *
*
* Default Export
*
* */
export default TEMAIndicator;
/* *
*
* API Options
*
* */
/**
* A `TEMA` series. If the [type](#series.tema.type) option is not
* specified, it is inherited from [chart.type](#chart.type).
*
* @extends series,plotOptions.tema
* @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/tema
* @apioption series.tema
*/
''; // To include the above in the js output