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. !!!!!!!
*
* */
;
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
import SeriesRegistry from '../../../Core/Series/SeriesRegistry.js';
var SMAIndicator = SeriesRegistry.seriesTypes.sma;
import U from '../../../Core/Utilities.js';
var isArray = U.isArray, merge = U.merge;
/* eslint-disable require-jsdoc */
// Utils:
function toFixed(a, n) {
return parseFloat(a.toFixed(n));
}
/* eslint-enable require-jsdoc */
/**
* The RSI series type.
*
* @private
* @class
* @name Highcharts.seriesTypes.rsi
*
* @augments Highcharts.Series
*/
var RSIIndicator = /** @class */ (function (_super) {
__extends(RSIIndicator, _super);
function RSIIndicator() {
var _this = _super !== null && _super.apply(this, arguments) || this;
/* *
*
* Properties
*
* */
_this.data = void 0;
_this.points = void 0;
_this.options = void 0;
return _this;
}
/* *
*
* Functions
*
* */
RSIIndicator.prototype.getValues = function (series, params) {
var period = params.period, xVal = series.xData, yVal = series.yData, yValLen = yVal ? yVal.length : 0, decimals = params.decimals,
// RSI starts calculations from the second point
// Cause we need to calculate change between two points
range = 1, RSI = [], xData = [], yData = [], index = 3, gain = 0, loss = 0, RSIPoint, change, avgGain, avgLoss, i;
// RSI requires close value
if ((xVal.length < period) || !isArray(yVal[0]) ||
yVal[0].length !== 4) {
return;
}
// Calculate changes for first N points
while (range < period) {
change = toFixed(yVal[range][index] - yVal[range - 1][index], decimals);
if (change > 0) {
gain += change;
}
else {
loss += Math.abs(change);
}
range++;
}
// Average for first n-1 points:
avgGain = toFixed(gain / (period - 1), decimals);
avgLoss = toFixed(loss / (period - 1), decimals);
for (i = range; i < yValLen; i++) {
change = toFixed(yVal[i][index] - yVal[i - 1][index], decimals);
if (change > 0) {
gain = change;
loss = 0;
}
else {
gain = 0;
loss = Math.abs(change);
}
// Calculate smoothed averages, RS, RSI values:
avgGain = toFixed((avgGain * (period - 1) + gain) / period, decimals);
avgLoss = toFixed((avgLoss * (period - 1) + loss) / period, decimals);
// If average-loss is equal zero, then by definition RSI is set
// to 100:
if (avgLoss === 0) {
RSIPoint = 100;
// If average-gain is equal zero, then by definition RSI is set
// to 0:
}
else if (avgGain === 0) {
RSIPoint = 0;
}
else {
RSIPoint = toFixed(100 - (100 / (1 + (avgGain / avgLoss))), decimals);
}
RSI.push([xVal[i], RSIPoint]);
xData.push(xVal[i]);
yData.push(RSIPoint);
}
return {
values: RSI,
xData: xData,
yData: yData
};
};
/**
* Relative strength index (RSI) technical indicator. This series
* requires the `linkedTo` option to be set and should be loaded after
* the `stock/indicators/indicators.js` file.
*
* @sample stock/indicators/rsi
* RSI indicator
*
* @extends plotOptions.sma
* @since 6.0.0
* @product highstock
* @requires stock/indicators/indicators
* @requires stock/indicators/rsi
* @optionparent plotOptions.rsi
*/
RSIIndicator.defaultOptions = merge(SMAIndicator.defaultOptions, {
params: {
period: 14,
decimals: 4
}
});
return RSIIndicator;
}(SMAIndicator));
SeriesRegistry.registerSeriesType('rsi', RSIIndicator);
/* *
*
* Default Export
*
* */
export default RSIIndicator;
/**
* A `RSI` series. If the [type](#series.rsi.type) option is not
* specified, it is inherited from [chart.type](#chart.type).
*
* @extends series,plotOptions.rsi
* @since 6.0.0
* @product highstock
* @excluding dataParser, dataURL
* @requires stock/indicators/indicators
* @requires stock/indicators/rsi
* @apioption series.rsi
*/
''; // to include the above in the js output