@amcharts/amcharts5/.internal/charts/stock/indicators/StochasticOscillator.js

amCharts 5

import { OverboughtOversold } from "./OverboughtOversold";
import { LineSeries } from "../../xy/series/LineSeries";
import * as $array from "../../../core/util/Array";
import * as $type from "../../../core/util/Type";
/**
 * An implementation of a [[StockChart]] indicator.
 *
 * @see {@link https://www.amcharts.com/docs/v5/charts/stock/indicators/} for more info
 */
export class StochasticOscillator extends OverboughtOversold {
    _afterNew() {
        this._themeTags.push("stochastic");
        super._afterNew();
        this._editableSettings.unshift({
            key: "period",
            name: this.root.language.translateAny("Period"),
            type: "number",
            minValue: 2,
            maxValue: 50,
            step: 1
        }, {
            key: "seriesColor",
            name: this.root.language.translateAny("Period"),
            type: "color"
        }, {
            key: "kSmoothing",
            name: this.root.language.translateAny("K period"),
            type: "number",
            minValue: 1,
            maxValue: 20,
            step: 1
        }, {
            key: "dSmoothing",
            name: this.root.language.translateAny("SMA period"),
            type: "number",
            minValue: 1,
            maxValue: 20,
            step: 1
        }, {
            key: "slowColor",
            name: this.root.language.translateAny("SMA period"),
            type: "color"
        });
        this._setEditableSettingBounds("overBought", 70, 95, 1);
        this._setEditableSettingBounds("overSold", 5, 30, 1);
        this.yAxis.setAll({ min: 0, max: 100, strictMinMax: true });
        const slowSeries = this.panel.series.push(LineSeries.new(this._root, {
            valueXField: "valueX",
            valueYField: "slow",
            xAxis: this.xAxis,
            yAxis: this.yAxis,
            groupDataDisabled: true,
            themeTags: ["indicator", "slow"]
        }));
        this.slowSeries = slowSeries;
    }
    _updateChildren() {
        if (this.isDirty("kSmoothing") || this.isDirty("dSmoothing")) {
            this.markDataDirty();
            this.setCustomData("dSmoothing", this.get("dSmoothing"));
            this.setCustomData("kSmoothing", this.get("kSmoothing"));
        }
        super._updateChildren();
        if (this.isDirty("slowColor")) {
            this._updateSeriesColor(this.slowSeries, this.get("slowColor"), "slowColor");
        }
    }
    /**
     * @ignore
     */
    prepareData() {
        if (this.series) {
            const dataItems = this.get("stockSeries").dataItems;
            let period = this.get("period", 14);
            let data = [];
            let index = 0;
            $array.each(dataItems, (dataItem) => {
                const valueX = dataItem.get("valueX");
                let k;
                if (index >= period - 1) {
                    let value = this._getValue(dataItem);
                    if (value != null) {
                        let lp = Infinity;
                        let hp = -lp;
                        for (let j = index; j > index - period; j--) {
                            let h = dataItems[j].get("highValueY");
                            let l = dataItems[j].get("lowValueY");
                            if (h != null && l != null) {
                                if (l < lp) {
                                    lp = l;
                                }
                                if (h > hp) {
                                    hp = h;
                                }
                            }
                        }
                        k = (value - lp) / (hp - lp) * 100;
                    }
                }
                if (k == null || $type.isNaN(k)) {
                    data.push({ valueX: valueX });
                }
                else {
                    data.push({ valueX: valueX, value_y: k });
                }
                index++;
            });
            period = this.get("kSmoothing", 1);
            this._sma(data, period, "value_y", "valueS");
            period = this.get("dSmoothing", 3);
            this._sma(data, period, "valueS", "slow");
            this.series.updateData(data);
            this.slowSeries.updateData(data);
        }
    }
}
StochasticOscillator.className = "StochasticOscillator";
StochasticOscillator.classNames = OverboughtOversold.classNames.concat([StochasticOscillator.className]);
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