Area chart widgets

[ 1 About area chart widgets ] [ 2 What data do I need for this widget? ] [ 3 Widget settings ] [ 4 Tips for using an area chart ] [ 5 Query example ]

About area chart widgets

The area chart widget draws a line chart where the x-axis is always time. Use this to plot one or several series of data points over the same time period to create a line or lines. The area below the line or lines drawn is shaded by default.

These are useful when you want to analyze how a single entity has changed over time, or to compare the evolution of similar groups over time.

What data do I need for this widget?

If the source query groups events, it must also contain an aggregated value for each group (count, average, maximum, mean, etc.). Events grouped by time and a second or third grouping element will be capable of plotting multiple series over the selected time range.

If the source query does not group events, the metric for the y-axis will be automatically selected using the first of the numeric fields in the query. You can change this in the widget's visual settings.

Widget settings

To edit the widget settings, you must first activate the Edit mode.

Click the widget title bar to open its settings. Alternatively, the settings are accessible via the Ellipsis icon → Properties. The widget settings are contained in three tabs: Data, Visual, and Raw.

The settings in the Data and Raw tabs are described in the Create a widget article. These are the Visual settings for the area chart:

Category	Setting	Description

Category	Setting	Description
Fields	X-axis	This will default to the eventdate field making the x-axis a timeline. You can change this by selecting a different field. If the query used contains more than one field, you can select them in the same dropdown to represent their sets of unique values together in the same axis. Multi-axis: You can also select fields in the dropdown immediately below (Select…) to represent their sets of unique values separately in a separate axis. An extra dropdown will keep appearing below for additional axes as long as there are fields remaining to select (axes can contain several fields but each field can be used only once).
	Y-axis (Number)	The values of this field are used to plot the y-axis and must be metrics. If the query used contains more than one suitable field for this axis, you can select them in the same dropdown to represent their values as a unified scale in the same axis. Multi-axis: You can also select fields in the dropdown immediately below (Select…) to represent their values as a separate scale in a separate axis. An extra dropdown will keep appearing below for additional axes as long as there are suitable fields remaining to select (axes can contain several fields but each field can be used only once).
	Series	Choose fields to correlate their values with those of the fields chosen for the axes. This plots multiple lines in the chart to generate data partitioning and show data distribution. When plotting multiple series, use the Max series setting below to specify a maximum number of them (see below for the setting).
Time gaps	Exclude boundary periods	If your query has a grouping clause, there might be incomplete periods at the beginning or end of the graph depending on the selected time range. To prevent any possible misinterpretation derived from that, you can decide what to do with them: None: neither of the periods will be hidden, allowing you to see the real situation with incomplete periods in your time range. Both periods: both the first and last periods will be hidden, allowing you to focus only on the full periods in your time range. First period: only the first period will be hidden, allowing you to see exactly where your meaningful data starts. Last period: only the last period will be hidden, allowing you to see exactly where your meaningful data ends.
Time gaps	Fill gaps	If your query has a grouping clause, there will be periods of time where no data is received. You can decide how to draw this point: as null - leaves the empty values as null and they do not have nodes representing them on the chart as zero - plots the empty values as zero and they have nodes representing them on the chart connected - represents on the chart a line that connects each of the nodes with values, bypassing those without them.
General	Inverted	Toggle to invert the X- and Y-axes.
	Max series	This is the maximum number of lines to plot on the chart. This is done to avoid overcrowding and to maintain readability. Max series - specify a maximum number of series. Ascending/descending - select whether to sort from ascending or descending order. Maximum values - to avoid overcrowding and improve appearance, you can select different options to display data on the chart: Maximum values Minimum values Number of events Sum of events
	Default type	This is the style of line chart to apply. The list of options includes Line, Spline, Column, Area, and Area + Spline. All of these chart types are plotted using an X and Y axis and this setting lets you switch between different styles to apply the one that best suits your data. Area is selected by default when you create this type of widget.
Axis properties	X-axis	For each field that contributes to the x-axis, enter a Title and data Type. The Title is simply a label to display for the axis. The Type that you select here will be applied to the values used for the x-axis. In a datetime axis, the numbers are given in milliseconds, and tick marks are placed on appropriate values like full hours or days. In a category axis, the point names of the chart's series are used for categories. Linear is useful in situations where there is a direct correlation between variables. With this option, the x-axis displays a scale with a uniform distribution of its values. Logarithmic is useful when there are enormous differences in group values making it difficult to display the data. This changes the scale of the x-axis so that the ticks from left to right represent larger value jumps.
	Y-axis	For each field that contributes to the y-axis, enter a Title and data Type. The Title is simply a label to display for the axis. The Type that you select here will be applied to the values used for the y-axis. In a datetime axis, the numbers are given in milliseconds, and tick marks are placed on appropriate values like full hours or days. In a category axis, the point names of the chart's series are used for categories. Logarithmic is useful when there are enormous differences in group values making it difficult to display the data. This changes the scale of the y-axis so that the ticks from bottom to top represent larger value jumps. You can decide the maximum and minimum values to be displayed in the y-axis in the Max displayed and Min displayed fields. If you don't enter any value, the limits will be automatically calculated.
Series	For each data series, this group of settings enable you to customize their individual characteristics.
	ID	Unique, internal identifier for this data series.
	Name	The label for the series. This will appear in the tooltip and in the chart legend.
	Marker	Enabled: when the toggle is activated, the data points on the line will become visible, enabling you to observe their exact positions.
	Marker	Radius: write the size of the data points in pixels, or use the arrows to increase or decrease it.
	Color	Select the color for the data series.
	Line width	This is the width of the line in pixels.
	Dash style	Choose a dashed line style for the selected data series.
	Type	Select display style for the selected series. Choose from Line, Spline, Column, Area, and Area + Spline.
	Stack Group	This is an adapted version of the stacking capability offered by the stacked area chart widgets. You can transform the widget as explained here to get the stacked version of this widget and enjoy the full capability. Use this option to group series that belong together for the context of your analysis and show them stacked on the chart. Series will be shown as part of the group assigned, while series that are not assigned to a group will be shown inside the Default stack group. You can either select an existing group or create a new one. A group is available to select as long as it is used for at least one series. To create a new one, simply click inside the field, write the desired name, and press the Enter key or click the Create ”Name” field that appears right below.
Legend	Horizontal alignment	Select the horizontal alignment of the legend that indicates the different series. Choose center, right or left.
	Vertical alignment	Select the vertical alignment of the legend. Choose bottom, top or middle.
	Legend layout	Select the layout alignment of the legend. Choose horizontal or vertical.
	Size (px)	Select the font size, ranging from 16px to 320px.

Tips for using an area chart

Here are a few tips to get the most out of your area chart.

Move your mouse over the chart to display a tooltip that contains detailed information about the series plotted in the chart.
Click and drag across a section of the chart to zoom to the time period in the chart. Click Reset zoom to go back to the default view.
Hover over a data series in the chart legend to dim the rest of them down in the chart or click it to hide it or show it. You can also click the Hide all Series / Show all series button at the top right corner to hide / show all the series in the chart.

Query example

This is the source query used and the fields mapped to generate the widget shown above:

query(
from demo.ecommerce.data
group every 1h by str(statusCode), method, protocol 
select count() as count 
)

X-axis	eventdate
Y-axis	count
Series	statusCode