JavaScript Chart with Vertically Stacked Axes

1import { appTheme } from "../../../theme";
2
3import { EWrapTo, NativeTextAnnotation, TSciChart } from "scichart";
4
5import {
6    EAxisAlignment,
7    ECoordinateMode,
8    EExecuteOn,
9    EHorizontalAnchorPoint,
10    EXyDirection,
11    FastLineRenderableSeries,
12    LeftAlignedOuterVerticallyStackedAxisLayoutStrategy,
13    MouseWheelZoomModifier,
14    NumberRange,
15    NumericAxis,
16    RubberBandXyZoomModifier,
17    SciChartSurface,
18    TextAnnotation,
19    XAxisDragModifier,
20    XyDataSeries,
21    YAxisDragModifier,
22    ZoomExtentsModifier,
23} from "scichart";
24
25export const drawExample = async (rootElement: string | HTMLDivElement) => {
26    const { sciChartSurface, wasmContext } = await SciChartSurface.create(rootElement, {
27        theme: appTheme.SciChartJsTheme,
28    });
29
30    sciChartSurface.layoutManager.leftOuterAxesLayoutStrategy =
31        new LeftAlignedOuterVerticallyStackedAxisLayoutStrategy();
32
33    sciChartSurface.xAxes.add(new NumericAxis(wasmContext, { axisTitle: "X Axis" }));
34
35    // Add title annotation
36    sciChartSurface.annotations.add(
37        new NativeTextAnnotation({
38            text: "Vertically Stacked Axis: Custom layout of axis to allow traces to overlap. Useful for ECG charts",
39            fontSize: 16,
40            textColor: appTheme.ForegroundColor,
41            x1: 0.5,
42            y1: 0,
43            opacity: 0.77,
44            horizontalAnchorPoint: EHorizontalAnchorPoint.Center,
45            xCoordinateMode: ECoordinateMode.Relative,
46            yCoordinateMode: ECoordinateMode.Relative,
47            wrapTo: EWrapTo.ViewRect,
48        })
49    );
50
51    const seriesCount: number = 10;
52    for (let i = 0; i < seriesCount; i++) {
53        const range = 10 / seriesCount;
54        const yAxis = new NumericAxis(wasmContext, {
55            id: "Y" + i,
56            visibleRange: new NumberRange(-range, range),
57            axisAlignment: EAxisAlignment.Left,
58            zoomExtentsToInitialRange: true,
59            maxAutoTicks: 5,
60            drawMinorGridLines: false,
61            axisBorder: { borderTop: 5, borderBottom: 5 },
62            axisTitle: `Y ${i}`,
63        });
64        sciChartSurface.yAxes.add(yAxis);
65
66        const lineSeries = new FastLineRenderableSeries(wasmContext, {
67            yAxisId: yAxis.id,
68            stroke: "auto",
69            strokeThickness: 2,
70        });
71        lineSeries.dataSeries = getRandomSinewave(wasmContext, 0, Math.random() * 3, Math.random() * 50, 10000, 10);
72        sciChartSurface.renderableSeries.add(lineSeries);
73    }
74
75    // Optional: Add some interactivity modifiers to enable zooming and panning
76    sciChartSurface.chartModifiers.add(
77        new YAxisDragModifier(),
78        new XAxisDragModifier(),
79        new RubberBandXyZoomModifier({
80            xyDirection: EXyDirection.XDirection,
81            executeCondition: { button: EExecuteOn.MouseRightButton },
82        }),
83        new MouseWheelZoomModifier({ xyDirection: EXyDirection.YDirection }),
84        new ZoomExtentsModifier()
85    );
86
87    return { sciChartSurface, wasmContext };
88};
89
90function getRandomSinewave(
91    wasmContext: TSciChart,
92    pad: number,
93    amplitude: number,
94    phase: number,
95    pointCount: number,
96    freq: number
97) {
98    const dataSeries = new XyDataSeries(wasmContext);
99
100    for (let i = 0; i < pad; i++) {
101        const time = (10 * i) / pointCount;
102        dataSeries.append(time, 0);
103    }
104
105    for (let i = pad, j = 0; i < pointCount; i++, j++) {
106        amplitude = Math.min(3, Math.max(0.1, amplitude * (1 + (Math.random() - 0.5) / 10)));
107        freq = Math.min(50, Math.max(0.1, freq * (1 + (Math.random() - 0.5) / 50)));
108
109        const time = (10 * i) / pointCount;
110        const wn = (2 * Math.PI) / (pointCount / freq);
111
112        const d = amplitude * Math.sin(j * wn + phase);
113        dataSeries.append(time, d);
114    }
115
116    return dataSeries;
117}
118