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Radar Line Chart - Dashboard Control

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Modified on Wed, 14 Aug 2013 02:37 PM Categorized as Chart, Data Controls, Design
Click to return to: Documentation | Designing Dashboards | DV Controls | Chart | Types of Charts

A Radar Line Chart and a Legend.

A Radar Line Chart and a Legend.



Overview

The Radar Line Chart is a type of circular graph that plots metric values along radial axes originating from the center of the graph. A data point is plotted on each axis, with the distance along the axis representing the metric value.

Data points belonging to the same chart series are connected by a radar line. You can control the Stroke Thickness or Fill brush of a radar line by configuring the properties of its corresponding series.

The grid lines in the plotting area can be displayed as polygons or circles. Other notes:


Radar charts typically have a category scale but using a numeric or date/time dimension is also possible.

Features

Toolbox

You can access the Radar Line Chart type from the Dashboard Designer Toolbox, under the Data Controls\Charts folder.

Radar Line Chart from the toolbox.

Radar Line Chart from the toolbox.


Comparing multiple KPIs

Radar charts are often used to compare metrics. For example, the dashboard in the top-right corner was created by adding two KPIs to a radar line chart as follows.

KPI - Sales of Audio products.

KPI - Sales of Audio products.

 
KPI - Sales of Video products.

KPI - Sales of Video products.


Circular versus polygon style

The grid lines in the plotting area can be displayed as polygons or circles. For example, to display circular grid lines (instead of polygons), set the Plotting Area Style of the first circular chart series to Circular. This is an advanced property.

Plotting Area Style advanced property.

Plotting Area Style advanced property.


A Radar Line Chart with a Circular plotting area style.

A Radar Line Chart with a Circular plotting area style.


When the plotting area style is set to Polygon, X axis line and Y axis grid lines are drawn as polygonal sectors based on the position of all major grid lines. However, the display will revert to the circular style under these conditions:

  • The X axis or major grid is not visible.
  • There are less than 3 sectors.

The polygon style should only be used when you have a small number of data points or categories because there is a limit to the number of polygonal sectors that can be displayed. If there are more data points than the number of sectors, comparing off-axis data points against grid lines will be meaningless. In this case, switch to the circular style, or choose a different type of chart such as line.

Radar Size

Use the Radar Size property to control the size of the radar graph relative to the overall plotting area. The default value is 100%.

This is an advanced property that must be set for the first circular chart series.

Radar Size advanced property.

Radar Size advanced property.


The Minimum Radar Size property specifies the smallest size of the radar chart once the X axis labels are accommodated, relative to the radar size. If the labels do not fit they will be cropped. The default value is 60%.

Choosing a smaller minimum radar size helps to ensure that X axis labels are still visible even as the chart is being resized smaller (e.g. due to the dashboard being resized smaller).

Start Angle

Use the Start Angle advanced property to set the starting angle of the radar plot. This angle is measured in a clockwise direction from the 12 o'clock position. The default value is 0 degrees.

Start Angle of 45 degrees.

Start Angle of 45 degrees.


Limitations

Due to the nature of circular charts, the following chart features do not apply or are unsupported for all radar chart types:

  • Animations
  • Axis settings
    • Auto Margins (HasAutoMargins)
    • Crossing value/position
    • Data table (IsDataTableEnabled)
    • Labels autofit
    • Marks next to axis (applicable only for quadrant charts)
    • Switch X & Y Axes (AxesAreTransposed)
    • Title
    • X Axis Label Groupings (XAxisLabelGroupings)
  • Chart cursor
  • Large dataset optimizations for rendering
  • Multiple axes (only primary X axis and primary Y axis is supported)
  • Scale breaks
  • Zooming

Related topics


Click to return to: Documentation | Designing Dashboards | DV Controls | Chart | Types of Charts

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