The History Line Chart Viewlet is used to plot values for multiple similar variables over time. For each interval over the selected time period, the Viewlet can plot the maximum, minimum, average, or sum of the variable. One of the most informative history viewlets, the peaks and valleys seen in a History Line Chart can give the user an instant view of energy consumption and efficiency over time.
This example shows temperature kWh trends from several two locations over a specific time period.
History Line Chart Configuration
The History Line Chart can be configured to plot a multitude of lines, chosen by checking the standard set of selection boxes based upon locations imported from Periscope’s configuration menu. Corresponding color selection helps avoid confusion when displaying numerous locations on one graph. Options include selecting a time range to be graphed, and specifying a rollup period and value type. New viewlet functionality allows the user to manually drag a marquee over a section of the line or lines to zoom in and view any particular range, and then use the horizontal pan bar along the top of the viewlet to scroll across the line. Checking “Rotate” will position the graph rotated 90 degrees vertically on the Y axis. Selecting “show all” will revert back to displaying the entire time range indicated in the configuration menu.
