SciChart® the market leader in Fast WPF Charts, WPF 3D Charts, iOS Chart, Android Chart and JavaScript Chart Components

0 votes


I have a fast column renderable series where a column is added each hour. When the first column is added, it renders approximately half the graph (regardless of zoom), which is unintended. Once the data point for the second hour is added, the column collapses down to the space of the hour (as we would want). Why is the first column rendering too wide? Am I failing to set a parameter that is required?

Below is my series setup:

 val uoColumnSeries =
        generateColumnRenderableSeries(LABEL_ID_UO, uoColumnDataSeries, SolidBrushStyle(uoColumnColor))
    uoColumnSeries.dataPointWidth = .95

Attached is how the data renders with 1 point (zoomed in and out), and data render once second point (of height 0) is added. The graph in question is the column graph at the top in yellow.


0 votes

Is there an efficient way to append a subset of an array to a DataSeries? Manually looping with Append is slow (as expected). Iterating over an IEnumerable introduces overhead. I’ve read in the performance tips and tricks section that “Arrays have the biggest impact as these can be indexed using unsafe code”. The help documentation doesn’t list an Append overload specifically for an array so I assume the type is checked within the method.

I am reusing arrays whenever possible; however, my arriving data is not always the same length. In order to reduce allocations and garbage collection, I make use of Memory, Span, and ArraySegment elsewhere in my project. This allows me to pool and reuse memory. I have not found any DataSeries.Append overloads that would accept any of these types or otherwise allow me to specify the usable range of the array. Please let me know if I’ve overlooked something.

Thank you.

0 votes

I want to build a column chart but I got the following error:

ERROR TypeError: Cannot read property ‘append’ of undefined

The error happened in line #42.

My code:

export class OutputAmplitudeComponent implements OnInit, OnDestroy {

constructor(@Inject(SETTING_SERVICE) private settingService: SettingService, private cdr: ChangeDetectorRef) {}

ngOnInit() {        
                this.settingService.registerSetting(HarmonicAmpSetting).pipe(takeUntil(this.ngUnsubHarmonicData)).subscribe(setting => {
                    const OutputAmplitudeData = setting.value;

                    for (let x = 1; x < this.numberOfOutput; x++) {
                        if (this.OutputMode === 'Voltage') {
                            if (phaseNum === 1) {
                      [x-1].voltage1 = OutputAmplitudeData[x];
                            } else if (phaseNum === 2) {
                      [x-1].voltage2 = OutputAmplitudeData[x];
                            } else if (phaseNum === 3) {
                      [x-1].voltage3 = OutputAmplitudeData[x]; 
                        } else if (this.OutputMode === 'Current') {
                            if (phaseNum === 1) {
                      [x-1].current1 = OutputAmplitudeData[x];
                            } else if (phaseNum === 2) {
                      [x-1].current2 = OutputAmplitudeData[x];
                            } else if (phaseNum === 3) {
                      [x-1].current3 = OutputAmplitudeData[x];


    var phaseNum1 = [];
    var xData = [];
    for (let x = 1; x < this.numberOfOutput; x++) {
        if ( != null &&[x-1] != null) {
            phaseNum1[x - 1] = parseFloat([x - 1].voltage1);
            xData[x - 1] = x;
            if (!isNaN(phaseNum1[x - 1])) {
            } else {
                console.log("No num");

async sciChartInit() {

    const { wasmContext, sciChartSurface } = await SciChartSurface.create("chart");

    var phaseNum1 = [];
    var xData = [];
    this.dataSeries1 = new XyDataSeries(wasmContext);
    for (let x = 1; x < this.numberOfOutput; x++) {
        this.dataSeries1.append(x, x);

    const xAxis = new NumericAxis(wasmContext);
    const yAxis = new NumericAxis(wasmContext);

    const rendSeries1 = new StackedColumnRenderableSeries(wasmContext);
    rendSeries1.fill = "#dc443f";
    rendSeries1.stroke = "green";
    rendSeries1.strokeThickness = 1;
    rendSeries1.dataSeries = this.dataSeries1;
    rendSeries1.stackedGroupId = "one";

    const verticallyStackedColumnCollection = new StackedColumnCollection(wasmContext);
    verticallyStackedColumnCollection.dataPointWidth = 0.5;
    verticallyStackedColumnCollection.animation = new ScaleAnimation({ duration: 1000, fadeEffect: true });

    sciChartSurface.chartModifiers.add(new ZoomExtentsModifier(), new ZoomPanModifier(), new MouseWheelZoomModifier());

        new LegendModifier({
            placement: ELegendPlacement.TopRight,
            orientation: ELegendOrientation.Horizontal,
            showLegend: true,
            showCheckboxes: true,
            showSeriesMarkers: true
    return { wasmContext, sciChartSurface };

I don’t understand what is undefined and why.

Thank you.

  • ETS Ong asked 1 year ago
  • last active 1 year ago
Showing 3 results
This template supports the sidebar's widgets. Add one or use Full Width layout.