Line Chart

This content item displays data in a line chart. Analog, digital/discrete, and string stream types are supported.

Note: This section describes the line chart content item in the Visualization category. For details on the line chart content item in the Event Visualization category, see Line Chart in the Event Visualization section.

Configure the following properties for this content item:

• In the Basic tab:

  • Follow asset context - When this is enabled:

    • If this content is in a dashboard, it uses the dashboard's asset context as the asset for asset stream ref data. For details, see Create a new dashboard.

    • If this content is in an experience, it uses the navigation item's asset reference as the asset for asset stream ref data. For details, see the Add content to a pane section in Add content to panes in your navigation items.

      This property only affects asset stream ref data; it has no effect if the content item is configured with stream data.

  • Follow time context - When this is enabled:

    • If this content is in a dashboard, it uses the dashboard's time context as the time range for the data it displays. For details, see Create a new dashboard.

    • If this content is in an experience, it uses the time selected in the time selector content item as the time range for the data it displays. For details, see Add a time selector.

  • Time - If Follow time context is disabled, select the time range for the data displayed in the content item.

  • Add Data - Select data items to include in this content item. You can search for data items by name, by filter, or both.

    • To search by name, enter a value in the Search for data field.

    • To apply filters, select to view and select filters. Select to accept your selected filters and return to the previous search panel.

    • To add a single data item, select that item's name. To add multiple data items, check the box for each, then select Add Data.

• In the Advanced tab:

  • Title - The title that displays for this content item. This property is only available in grid dashboards; content items do not display titles in canvas dashboards or experiences.

  • Show legend - Display the legend. Only available with Single and Multi Y-Axis types.

  • Y-Axis - The chart's y-axis representation. Select from:

    • Single - Display selected data items in a single y-axis.

    • Multi - Display each selected data item on a different y-axis, where each axis denotes the maximum and minimum value of the selected item.

    • Stacked - Display each of the selected data item on the y-axis, stacked vertically or horizontally (depending on the chart type selection).

• If start and end cursors have been placed with the Add Cursor tool, the Cursor tab shows calculations for the data between the start and end cursor. See Use Dual Cursors on Line Charts for details.

Scale the y-axis

You can use the Scale fields to manually scale the y-axis to better represent the data on display. This option is available if y-axis type is set to Stacked or Multi.

To set the Scale:

1. Select the Basic tab, then select a stream.

2. In the Scale section, select Manual. Enter the desired Min and Max.

   

Override stream interpolation

You can override the interpolation settings defined with streams using the Interpolation field.

To override the default interpolation:

3. Select the Basic tab, then select a stream.

4. In the Interpolation section, select the dropdown, then select the interpolation type:

   Note: (Default) is used to indicate the default interpolation setting of the stream.

   • Linear: Show a smooth line. The value between two points is extrapolated in a linear line.

   • StairStep: Show a step line. The horizontal part of the right-angle is drawn from the previous value, and the vertical part indicates the next value.

     

Edit, hide, or remove data

After a stream or asset stream ref has been added to the content item, use the buttons to the right of it to edit, hide, or remove it.

• Edit: Change the name that displays in the content item for the stream or asset stream ref.

• Hide/Unhide: Hide or unhide the stream or asset stream ref.

• Remove: Remove the stream or asset stream ref from the content item.

Missing data

Line charts show missing data by using an alternate line style. The alternate line style appears when an interval has a null value or when there is no newer data after the last valid value.

When you hover over the alternate segment, the tooltip shows the last known valid value and its timestamp.