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/**
* @license Highcharts JS v7.1.1 (2019-04-09)
*
* Indicator series type for Highstock
*
* (c) 2010-2019 Sebastian Bochan
*
* License: www.highcharts.com/license
*/
'use strict';
(function (factory) {
if (typeof module === 'object' && module.exports) {
factory['default'] = factory;
module.exports = factory;
} else if (typeof define === 'function' && define.amd) {
define('highcharts/indicators/ema', ['highcharts', 'highcharts/modules/stock'], function (Highcharts) {
factory(Highcharts);
factory.Highcharts = Highcharts;
return factory;
});
} else {
factory(typeof Highcharts !== 'undefined' ? Highcharts : undefined);
}
}(function (Highcharts) {
var _modules = Highcharts ? Highcharts._modules : {};
function _registerModule(obj, path, args, fn) {
if (!obj.hasOwnProperty(path)) {
obj[path] = fn.apply(null, args);
}
}
_registerModule(_modules, 'indicators/ema.src.js', [_modules['parts/Globals.js']], function (H) {
/* *
*
* License: www.highcharts.com/license
*
* */
var isArray = H.isArray,
seriesType = H.seriesType,
correctFloat = H.correctFloat;
/**
* The EMA series type.
*
* @private
* @class
* @name Highcharts.seriesTypes.ema
*
* @augments Highcharts.Series
*/
seriesType(
'ema',
'sma',
/**
* Exponential moving average indicator (EMA). This series requires the
* `linkedTo` option to be set.
*
* @sample stock/indicators/ema
* Exponential moving average indicator
*
* @extends plotOptions.sma
* @since 6.0.0
* @product highstock
* @optionparent plotOptions.ema
*/
{
params: {
/**
* The point index which indicator calculations will base. For
* example using OHLC data, index=2 means the indicator will be
* calculated using Low values.
*
* By default index value used to be set to 0. Since Highstock 7
* by default index is set to 3 which means that the ema
* indicator will be calculated using Close values.
*/
index: 3,
period: 9 // @merge 14 in v6.2
}
},
/**
* @lends Highcharts.Series#
*/
{
accumulatePeriodPoints: function (
period,
index,
yVal
) {
var sum = 0,
i = 0,
y = 0;
while (i < period) {
y = index < 0 ? yVal[i] : yVal[i][index];
sum = sum + y;
i++;
}
return sum;
},
calculateEma: function (
xVal,
yVal,
i,
EMApercent,
calEMA,
index,
SMA
) {
var x = xVal[i - 1],
yValue = index < 0 ? yVal[i - 1] : yVal[i - 1][index],
y;
y = calEMA === undefined ?
SMA : correctFloat((yValue * EMApercent) +
(calEMA * (1 - EMApercent)));
return [x, y];
},
getValues: function (series, params) {
var period = params.period,
xVal = series.xData,
yVal = series.yData,
yValLen = yVal ? yVal.length : 0,
EMApercent = 2 / (period + 1),
sum = 0,
EMA = [],
xData = [],
yData = [],
index = -1,
SMA = 0,
calEMA,
EMAPoint,
i;
// Check period, if bigger than points length, skip
if (yValLen < period) {
return false;
}
// Switch index for OHLC / Candlestick / Arearange
if (isArray(yVal[0])) {
index = params.index ? params.index : 0;
}
// Accumulate first N-points
sum = this.accumulatePeriodPoints(
period,
index,
yVal
);
// first point
SMA = sum / period;
// Calculate value one-by-one for each period in visible data
for (i = period; i < yValLen + 1; i++) {
EMAPoint = this.calculateEma(
xVal,
yVal,
i,
EMApercent,
calEMA,
index,
SMA
);
EMA.push(EMAPoint);
xData.push(EMAPoint[0]);
yData.push(EMAPoint[1]);
calEMA = EMAPoint[1];
}
return {
values: EMA,
xData: xData,
yData: yData
};
}
}
);
/**
* A `EMA` series. If the [type](#series.ema.type) option is not
* specified, it is inherited from [chart.type](#chart.type).
*
* @extends series,plotOptions.ema
* @since 6.0.0
* @product highstock
* @excluding dataParser, dataURL
* @apioption series.ema
*/
});
_registerModule(_modules, 'masters/indicators/ema.src.js', [], function () {
});
}));