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static/lib/Highcharts-10.2.1/es-modules/Stock/Indicators/EMA/EMAIndicator.js

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+/* *
+ *
+ *  License: www.highcharts.com/license
+ *
+ *  !!!!!!! SOURCE GETS TRANSPILED BY TYPESCRIPT. EDIT TS FILE ONLY. !!!!!!!
+ *
+ * */
+'use strict';
+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 (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
+        return extendStatics(d, b);
+    };
+    return function (d, b) {
+        if (typeof b !== "function" && b !== null)
+            throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
+        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 correctFloat = U.correctFloat, isArray = U.isArray, merge = U.merge;
+/* *
+ *
+ *  Class
+ *
+ * */
+/**
+ * The EMA series type.
+ *
+ * @private
+ * @class
+ * @name Highcharts.seriesTypes.ema
+ *
+ * @augments Highcharts.Series
+ */
+var EMAIndicator = /** @class */ (function (_super) {
+    __extends(EMAIndicator, _super);
+    function EMAIndicator() {
+        /* *
+         *
+         *  Static Properties
+         *
+         * */
+        var _this = _super !== null && _super.apply(this, arguments) || this;
+        /* *
+         *
+         *  Properties
+         *
+         * */
+        _this.data = void 0;
+        _this.options = void 0;
+        _this.points = void 0;
+        return _this;
+    }
+    /* *
+     *
+     *  Functions
+     *
+     * */
+    EMAIndicator.prototype.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;
+    };
+    EMAIndicator.prototype.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 = typeof calEMA === 'undefined' ?
+            SMA : correctFloat((yValue * EMApercent) +
+            (calEMA * (1 - EMApercent)));
+        return [x, y];
+    };
+    EMAIndicator.prototype.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;
+        }
+        // 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
+        };
+    };
+    /**
+     * 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
+     * @requires     stock/indicators/indicators
+     * @optionparent plotOptions.ema
+     */
+    EMAIndicator.defaultOptions = merge(SMAIndicator.defaultOptions, {
+        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
+             * Highcharts Stock 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
+        }
+    });
+    return EMAIndicator;
+}(SMAIndicator));
+SeriesRegistry.registerSeriesType('ema', EMAIndicator);
+/* *
+ *
+ *  Default Export
+ *
+ * */
+export default EMAIndicator;
+/* *
+ *
+ *  API Options
+ *
+ * */
+/**
+ * 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
+ * @requires  stock/indicators/indicators
+ * @apioption series.ema
+ */
+''; // adds doclet above to the transpiled file