Web Components for Insights Hub and Industrial IoT
Time Series Chart

The TimeSeries Chart displays a line graph of aggregated or raw time series data for the variables of a selected aspect during a specific date/time range. Based on the component's configuration (e.g. zoomDisabled, wheelZoom), the user can change the selected range interactively by dragging or zooming in and out.

A developer can select a data provider Aggregates or Raw. Furthermore he can select Auto, which switches automatically between the two modes depending on the timerange.

In Aggregates mode, the chart displays the first value, last value, minimum, and maximum sorted by timestamp for each aggregate and connects them by one line per variable.

In Raw mode, the chart displays the last 2000 values. If there are more data points available in the selected time range, it is indicated by using a dotted line.

The TimeSeries Chart supports the following:

• Data types long, double, int, boolean
• Simultaneous display of variables from different assets and different aspects
• String variables are shown with a symbol in the chart. The related value can be shown in the tooltip.
• [Experimental] Manipulating the chart for your custom needs by using the chartOptionsFormatter

Example¶

Interface¶

Models¶

interface TimeZoneDateRange {
    from: Date;
    to: Date;
    isAllDay: boolean;
    timeZone: TimeZone;
}

interface IDataModel {
  // forces reload of data, e.g. re-loading the chart
  refresh(): void;
}

interface IViewModel {
  refresh(): void;
}

interface IChartViewModel extends IViewModel {
    readonly chartInstance: ECharts;
    chartOptionsFormatter: (chartOptions: EChartsCustomOptions) => {};
}

interface AggregationLevelInfo {
  level?: string;
  levelTranslated?: string;
  value?: number;
}

enum ChartLineMode {
    linear = 'linear',
    noLine = 'noLine',
    stepStart = 'stepStart',
    stepMiddle = 'stepMiddle',
    stepEnd = 'stepEnd',
    smooth = 'smooth',
}

enum ChartSymbol {
    circle = 'circle',
    rectangle = 'rectangle',
    triangle = 'triangle',
    diamond = 'diamond',
    emptyCircle = 'emptyCircle',
    emptyRectangle = 'emptyRectangle',
    emptyTriangle = 'emptyTriangle',
    emptyDiamond = 'emptyDiamond',
}

enum TimeZone {
    Local = 'Local',
    UTC = 'UTC',
}

Remarks¶

• For performance reasons, it is recommended to limit the number of variables displayed in the TimeSeries Chart to 10.

Roles¶

• mdsp:core:iot.tsaUser (IoT Aggregates API V4 is used)
• mdsp:core:iot.timUser (IoT TimeSeries API is used)

Snippets¶

Display all Variables of an Aspect¶

You can either pass an object to specify the aspect or provide the full path.

timeSeriesChart.variablePaths = [
   // Show all variables of a given aspect
   {
      assetId: '89bba0c1e19c4884bce75d8bcc3773e5',
      aspectName: 'AspectNameX'
   }
];

timeSeriesChart.variablePaths = [
   // Convenient Syntax: write the path to the assetId/aspect
   '89bba0c1e19c4884bce75d8bcc3773e5/AspectNameX'
];

Display Specific Variables¶

You can either pass an object to specify the variables to be displayed or provide the full path.

timeSeriesChart.variablePaths = [
   // Show specific variables of an aspect
   {
      assetId: 'f9f1ff3ccaa1401a98cf37d0c9144c7e',
      aspectName: 'AspectNameX',
      variables: ['VariableName1', ...,'VariableNameN']
   }
];

timeSeriesChart.variablePaths = [
   // Convenient Syntax: write the path to the assetId/aspect/variableName1&variableName2.. etc.
   'f9f1ff3ccaa1401a98cf37d0c9144c7e/AspectNameX/VariableName1&...&VariableNameN'
];

Update the Variables using an Aspect Variable Selector¶

Use the event triggered by an Aspect Variable Selector to update the variables to be displayed in the Time Series Chart. A more detailed code sample is given here.

aspectVariableSelectorComp.addEventListener('selectedAspectsAndVariablesChanged', function (eventParams) {
            timeSeriesChart.variablePaths = eventParams.detail;
        });

Change the Timestamp Format in the Overlay¶

const timeSeriesChart = document.querySelector('mdsp-time-series-chart');
const localeSettings = chartComp.localeManager.getLocaleSettings();
localeSettings.tooltipTimestampFormat = "DD MM YY HH:mm:ss.SSS";
timeSeriesChart.localeManager.addLocale("en-custom", localeSettings);
timeSeriesChart.locale = "en-custom";

Change the variable name in the chart using an alias for a variable¶

const timeSeriesChart = document.querySelector('mdsp-time-series-chart');
timeSeriesChart.variablePaths = [{
   assetId: '730540babbb44fe58f24cc71c04fd1fc',
   aspectName: 'aspect_pump',
   variables: [{
      name: 'MotorCurrent',
      alias: 'Motor current which needs a very special alias name'
   }]
}]

Change the drag mode of the Time Series Chart¶

<mdsp-time-series-chart drag-mode="Select"></mdsp-time-series-chart>

Drag mode Select allows the user to drag and select an area in order to zoom into the chart. Drag mode Move will move the chart while dragging.

Select the data provider of the Time Series Chart¶

The Time Series Chart supports 3 different modes for the data providers

1. Auto: Switches automatically to TimeSeries mode if the date range is less then 2 minutes
2. Aggregates: Shows data of IoT Aggregates V4 API. The aggregation level is currently chosen depending on the selected time range.
3. TimeSeries: Shows data of IoT TimeSeries V3 API. Due to performance reasons, only the last 2000 values in the selected time range. If there is more data detected, the line will be displayed in a dotted style to indicate that a user can zoom in to get more data.

<mdsp-time-series-chart data-provider="TimeSeries"></mdsp-time-series-chart>

Manipulating the chart¶

You need more and want for example manipulating the chart to draw a separate line or change the look of the chart? The chartOptionsFormatter can be used to achieve that. Via this property you get access to the ECharts functionality which is used in the background.

In the following example a simple trend line is added to the chart, which just draw a separate line from the first to the last value of a given series.
About the different attributes and their possibilities you can learn in the official ECharts-documentation.

document.querySelector('mdsp-time-series-chart').view.chartOptionsFormatter = (c) => {

    console.log(c);
    // Example:
    // - push to series property a new entry like the following
    // - adjust id to be unique from the already existing ids
    // - define the name
    c.series.push({
        "id": "840d8a440128428eb16fc7bed9fcc40d/All/Long_SIMPLE_Trendline",
        "name": "SIMPLE_Trendline",
        "type": "line",
        "showSymbol": true,
        "hoverAnimation": true,
        "xAxisIndex": 0,
        "data": [
            c.series[0].data[0],
            c.series[0].data[c.series[0].data.length - 1]
        ],
        "animation": true,
        "animationDuration": 0,
        "color": "rgb(255,0,0)",
        "seriesType": "line",
        "itemStyle": {
            "normal": {
                "lineStyle": {},
                "color": "rgb(255,0,0)"
            }
        },
        "yAxisIndex": 0
    });
    c.legend.data = ["Inside", "SIMPLE_Trendline"];
};

Using different line modes in the chart¶

With the following snippet the time-series-chart can be changed to use a step line. Also other different line mode can be used.

    var chartComponent = document.querySelector('mdsp-time-series-chart');
    chartComponent.variableStyleOptions = [{
        variablePath: 'myAssetId/myAspectName/myVariableName', // to be replaced
        lineMode: 'stepStart',
    }];

Using symbols in the chart without a line and different color¶

Sometimes only the data points are interesting without drawing a line - also the color can be adapted using variableStyleOptions.

    var chartComponent = document.querySelector('mdsp-time-series-chart');
    chartComponent.variableStyleOptions = [{
        variablePath: 'myAssetId/myAspectName/myVariableName',  // to be replaced
        lineMode: 'noLine',
        symbol: 'emptyDiamond',
        symbolSize: 10,
        color: {red: 125, green: 0, blue: 0}
    }];

Using custom limits for the y-axis¶

By default, the y-axis are scaling to the min and max values of the current loaded data. In case you need custom limits, e.g. to avoid scaling of the chart in case of high peaks, you can configure the limits of the chart.

    var chartComponent = document.querySelector('mdsp-time-series-chart');
    chartComponent.chartStyleOptions = {
        viewMode: "Stacked",
        crossRuler: true,
        scaleOptions: {
            "scale_1": {
                valueRange: {
                    min: -100,
                    max: 100,
                },
            },
            "scale_2": {
                valueRange: {
                    min: -10,
                    max: 10,
                }
            }
        }
    };

If there is only on scale (y-axis), you can configure the limit of the default y-axis like this:

    var chartComponent = document.querySelector('mdsp-time-series-chart');
    chartComponent.valueRange = {
        min: -100,
        max: 100,
    };

Highlight variables while hovering¶

Differentiate between multiple lines in the chart by hovering over a specific line:

    var chartComponent = document.querySelector('mdsp-time-series-chart');
    chartComponent.highlightMode = true;

Switch to raw time series data¶

In some cases aggregates are not built yet, e.g if you're looking on 1 hour aggregates, but the data was injected in the last seconds. In this case the charts shows an empty state No aggregated data for selected variables or given variables. You can enable a button in this empty state, to switch to raw time series data.

    var chartComponent = document.querySelector('mdsp-time-series-chart');
    chartComponent.showSwitchToRawButton = true;

If you provide an UI element like a dropdown for selecting the mode, you can use the dataProviderChanged event to update the used data provider.

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