@amcharts/amcharts5
Version:
amCharts 5
74 lines • 2.66 kB
JavaScript
import { ChartIndicator } from "./ChartIndicator";
import { LineSeries } from "../../xy/series/LineSeries";
/**
* An implementation of a [[StockChart]] indicator.
*
* @see {@link https://www.amcharts.com/docs/v5/charts/stock/indicators/} for more info
*/
export class OnBalanceVolume extends ChartIndicator {
constructor() {
super(...arguments);
this._editableSettings = [{
key: "seriesColor",
name: this.root.language.translateAny("Color"),
type: "color"
}];
}
_afterNew() {
this._themeTags.push("onbalancevolume");
super._afterNew();
this.yAxis.set("numberFormat", "#.###a");
}
_createSeries() {
return this.panel.series.push(LineSeries.new(this._root, {
themeTags: ["indicator"],
xAxis: this.xAxis,
yAxis: this.yAxis,
valueXField: "valueX",
valueYField: "obv",
stroke: this.get("seriesColor"),
fill: undefined
}));
}
/**
* @ignore
*/
prepareData() {
if (this.series) {
this.setRaw("field", "close");
const dataItems = this.get("stockSeries").dataItems;
const volumeSeries = this.get("volumeSeries");
let data = this._getDataArray(dataItems);
let previous = 0;
let len = data.length;
if (volumeSeries && len > 1) {
let cy = data[0].value_y;
for (let i = 1; i < len; i++) {
const dataItem = data[i];
let c = dataItem.value_y;
if (c != null) {
const volumeDI = volumeSeries.dataItems[i];
let volume = 0;
if (volumeDI) {
volume = volumeDI.get("valueY", 1);
}
let obv = previous;
if (c > cy) {
obv += volume;
}
else if (c < cy) {
obv -= volume;
}
dataItem.obv = obv;
previous = obv;
cy = c;
}
}
}
this.series.updateData(data);
}
}
}
OnBalanceVolume.className = "OnBalanceVolume";
OnBalanceVolume.classNames = ChartIndicator.classNames.concat([OnBalanceVolume.className]);
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