JavaScript Chart with Central Axes

1import { appTheme } from "../../../theme";
2import {
3    CentralAxesLayoutManager,
4    EAnimationType,
5    EAxisAlignment,
6    ECoordinateMode,
7    EHorizontalAnchorPoint,
8    EInnerAxisPlacementCoordinateMode,
9    ELineDrawMode,
10    FastLineRenderableSeries,
11    ICentralAxesLayoutManagerOptions,
12    MouseWheelZoomModifier,
13    NumericAxis,
14    NumberRange,
15    PinchZoomModifier,
16    SciChartSurface,
17    TextAnnotation,
18    TSciChart,
19    XyDataSeries,
20    ZoomExtentsModifier,
21    ZoomPanModifier,
22} from "scichart";
23
24export const drawExample = async (rootElement: string | HTMLDivElement) => {
25    const { sciChartSurface, wasmContext } = await SciChartSurface.create(rootElement, {
26        theme: appTheme.SciChartJsTheme,
27    });
28
29    // Optional parameters to control exact placement of the axis
30    // These are defaults: which fix the axes in the center of the chart
31    // Relative coordinate mode and 0.5 means 'place half way'
32    // const options: ICentralAxesLayoutManagerOptions = {
33    //     horizontalAxisPositionCoordinateMode: EInnerAxisPlacementCoordinateMode.Relative,
34    //     verticalAxisPositionCoordinateMode: EInnerAxisPlacementCoordinateMode.Relative,
35    //     horizontalAxisPosition: 0.5,
36    //     verticalAxisPosition: 0.5
37    // };
38
39    // These options keep the axes crossing at (0,0), so the axes pan with the chart
40    const options: ICentralAxesLayoutManagerOptions = {
41        horizontalAxisPositionCoordinateMode: EInnerAxisPlacementCoordinateMode.DataValue,
42        verticalAxisPositionCoordinateMode: EInnerAxisPlacementCoordinateMode.DataValue,
43        horizontalAxisPosition: 0,
44        verticalAxisPosition: 0,
45    };
46
47    // Control the placement of the axis by specifying CentralAxesLayoutManager
48    // and isInnerAxis property
49    sciChartSurface.layoutManager = new CentralAxesLayoutManager(options);
50
51    // Configure x,y axis with central layout - oscilloscope style
52    sciChartSurface.xAxes.add(
53        new NumericAxis(wasmContext, {
54            visibleRange: new NumberRange(-5, 5),
55            isInnerAxis: true, // required for central axis
56            axisAlignment: EAxisAlignment.Top,
57            labelStyle: {
58                color: appTheme.PaleSkyBlue,
59            },
60            axisBorder: {
61                borderTop: 1,
62                color: appTheme.VividSkyBlue,
63            },
64        })
65    );
66
67    sciChartSurface.yAxes.add(
68        new NumericAxis(wasmContext, {
69            visibleRange: new NumberRange(-5, 5),
70            isInnerAxis: true, // required for central axis
71            axisAlignment: EAxisAlignment.Left,
72            labelStyle: {
73                color: appTheme.PaleSkyBlue,
74            },
75            axisBorder: {
76                borderLeft: 1,
77                color: appTheme.VividSkyBlue,
78            },
79        })
80    );
81
82    // Add a line series
83    sciChartSurface.renderableSeries.add(
84        new FastLineRenderableSeries(wasmContext, {
85            drawNaNAs: ELineDrawMode.PolyLine,
86            dataSeries: getButterflyCurve(wasmContext, 20000),
87            isDigitalLine: false,
88            stroke: appTheme.VividTeal,
89            animation: { type: EAnimationType.Fade, options: { duration: 500 } },
90        })
91    );
92
93    // Add title annotation
94    sciChartSurface.annotations.add(
95        new TextAnnotation({
96            text: "SciChart.js allows axis layout customisation including Central axis",
97            fontSize: 16,
98            textColor: appTheme.ForegroundColor,
99            x1: 0,
100            xCoordShift: 10,
101            y1: 0,
102            yCoordShift: 10,
103            opacity: 0.77,
104            horizontalAnchorPoint: EHorizontalAnchorPoint.Left,
105            xCoordinateMode: ECoordinateMode.Relative,
106            yCoordinateMode: ECoordinateMode.Relative,
107        })
108    );
109
110    // Add some interaction modifiers
111    sciChartSurface.chartModifiers.add(
112        new ZoomPanModifier({ enableZoom: true }),
113        new MouseWheelZoomModifier(),
114        new ZoomExtentsModifier()
115    );
116
117    return { sciChartSurface, wasmContext };
118};
119
120function getButterflyCurve(wasmContext: TSciChart, count: number = 2000) {
121    const temp = 0.01;
122    const dataSeries = new XyDataSeries(wasmContext);
123    for (let i = 0; i < count; i++) {
124        const t = i * temp;
125
126        const multiplier = Math.pow(Math.E, Math.cos(t)) - 2 * Math.cos(4 * t) - Math.pow(Math.sin(t / 12), 5);
127
128        const x = Math.sin(t) * multiplier;
129        const y = Math.cos(t) * multiplier;
130        dataSeries.append(x, y);
131    }
132    return dataSeries;
133}
134