Skip to content

Panel: Simple Line Chart

Overview

A simple representation of data over time, with buttons to quickly define scope of time displayed. Configurable time quick selects and thresholds. Limited to one number-type signal.

This panel provides the ability to visualize signal history (time series) on a line chart. The line chart is intentionally a basic view of the data that updates as new data is received.

For more complex views of time series data and showing multiple signals, the Panel: Complex Line Chart should be used.

__

Example simple line chart with a signal showing a gap.

Configuration options

The simple line chart supports 1 signal which can be selected on the Signal Selection step.

Default View Options

Option Default Description
Panel Title Name of Signal Text on the dashboard panel header
Default View Live Mode The default time period shown
Live Mode Time & Points

30 Minutes

1000 Reported Data Points

In Live Mode time view, specify the max number of minutes or hours and max number of points to show. Note that the max is 8 hours and 1000 points. These are configurable based on the fact different signals have different report rates.
Display Horizontal Gridlines Off When enabled, shows horizontal grid lines.
Display Legend Off When enabled, shows a legend for the signals on the chart.
Data Gaps Off When enabled, will show gaps in lines when the data points are greater than the number of times the report rate set. For example, if set to 3 times the report rate and the report rate is 60 seconds, a gap will be shown if two data points are greater than 180 seconds apart.
Show Timeline Navigator Off Show a timeline navigation panel at the bottom of the chart.
Display Min/Max Off For all Time Modes except Live, data is down-sampled. If turned on, this will show the minimum and maximum values during the down sampled periods in addition to the average.
Highlight Key Signal On Will show a specific signal's last value and optionally units at the top of the chart. Optionally can hide if signal is past its timeout setting.

Time Navigation

Allows setting up to 5 selectable time periods in the chart in addition to Live mode.

Default Time Selectable Periods

Data Types

Allows setting options for specific signals on the chart.

Option Default Description
Thresholds Allows showing one signal's thresholds for one rule on the chart. If there is a threshold for a signal when the chart is created, the threshold will automatically be turned on. (see Condition Rules)
Display Units Default Unit of Signal Allows converting the units in the panels.
Axis Range Allows setting the Y Axis range. If a threshold rule is available when the chart is created, it will default to Auto-Generate the Y axis range, otherwise defaults to 0 to 100.

Baselines

Allows setting a baseline horizontal line for the chart, for one signal, if any of the signals have a baseline property set.

Line Gaps

Line gaps will be shown if the signal has a set report rate. The chart uses 3x multiplier of the signal's report rate property to determine if a gap will be shown. By default the Simple Line panel will not connect data points with an unexpected gap.

Line gaps in a simple line chart

Timeout Handling

If the signal being displayed has a timeout property set, the chart will grey out if the last reported value is longer than the set timeout property value.

Two charts with signals with the same timeout property value.  One chart with the hide current value set.


Last update: April 7, 2021