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Radar Line Plot

Radar Line plots are useful to display ordinal measurements of one or more variables across a range of categories. A radar line plot arranges categories on a circle and connects the corresponding points with straight lines. Data values are represented by shapes called Symbols laid out along radial lines and connected with straight or curved lines.

Radar Line Plot with Multiple Values

A radar line plot could visualize measurements of one or more variables across a range of categories.

For example, the Radar Line Plot with Multiple Values Demo displays two types of average ratings for several movie genres.

Radar Line Plot with Multiple Lines

A multiple-line radar plot allows you to split data values into subcategories for more granular analysis. For instance, The Radar Line Plot with Multiple Lines Demo displays average movie ratings per country for several movie genres.

You can configure all these types using the Radar Line plot template and its properties described in the following sections.

You can use the following demos to explore plot properties - open a link, toggle the Report explorer, select the Plot - Plot 1 node and use the Properties panel to modify the configuration.

You could also download the report files listed below and open them in the Standalone Report Designer.

Data Values

The Radar Line plot's Values collection determines data values that are displayed by data points connected by lines. The collection items consist of two properties:

  • The Value is usually a bound field reference. Note: This property is the collection, but the Radar Line plot takes the first item only.
  • The Aggregate is an optional function, such as Count or Average, that reduces many field values into a single one.

Multiple data values generate multiple lines, as in the Radar Line Plot with Multiple Values Demo. You can switch the Show Values Names In Legend flag to supply the plot with a color legend that matches line colors and corresponding data value names.

Category Encoding

The Category Encoding of a Radar Line plot is a set of properties that determine categories for which the plot generates connected data points representing those above Data Values.

  • The Category is usually a bound field reference. Bound DataSet Records with the same value of that field fall into the same category. For instance, the Radar Line Plot with Multiple Values Demo is bound to the Ratings DataSet containing several fields, including the Genre field, for each data record. The plot's Category is set to {Genre} expression. Therefore the plot goes through the Ratings DataSet finds the distinct Genre values and generates one category per genre. If you preview the demo output, you can see seven genres.
  • The Category Sorting configuration determines the order of the category values appearance.

Details Encoding

The Details Encoding allows you to break down those above Data Values into subcategories for more granular analysis of changes.

The Details property of a Radar Line plot is the collection of items that determine these subcategories. Each item includes several properties:

  • The Values is usually one or more bound field references. Bound DataSet Records with the same values of these fields fall into the same subcategory. For instance, in the Radar Line Plot with Multiple Lines Demo the Details value is {Country}. Consequently, the Average Rating of each genre splits into the USA and South Korea subcategories that generate a data point.
  • The Exclude Nulls flag indicates whether DataSet Records with an undefined Details Value should be excluded from the visualization.
  • The Sorting configuration determines the order of categories appearance.

Colors Encoding

The Colors Encoding enables the color legend of the Category Encoding or Details Encoding and includes the Color expression and the optional Color Aggregate function that reduces many Color values into a single one.

Suppose the Details Encoding is empty. In that case, a Radar Line plot calculates distinct Color Encoding results for the categories produced by the Category Encoding and converts them to the background color of the corresponding symbols.

Otherwise, the plot calculates distinct Color Encoding results for the subcategories produced by the Details Encoding and converts them to the color of the corresponding lines.

In both cases, the plot picks up colors from the Chart Palette and displays the match between colors and encoding results in the legend.

For instance, the colors encoding in the Radar Line Plot with Multiple Lines Demo uses the {Country} expression. Consequently, the report output shows the colors legend that matches Countries with corresponding line colors.

Note: The Color property is the collection, but the Radar Line plot takes the first item only.

Shape Encoding

The Shape Encoding enables the shape legend of the Category Encoding or Details Encoding and includes the Shape expression and the optional Shape Aggregate function that reduces many Shape values into a single one.

Suppose the Details Encoding is empty. In that case, a Line plot calculates distinct Shape Encoding results for the categories produced by the Category Encoding and converts them to the shape of the corresponding symbol.

Otherwise, the plot calculates distinct Shape Encoding results for the subcategories produced by the Details Encoding and converts them to the corresponding symbols' shape.

You can try setting the Shape expression to {Genre} for the Radar Line Plot with Multiple Lines Demo. Consequently, the plot will use a unique symbol for each genre.

Shape Encoding Example

Note: Set the Symbol Shape property of the Line Plot to Auto to get the Shape Encoding worked.

Note: The Shape property is the collection, but the Radar Line plot takes the first item only.

Size Encoding

The Size Encoding configuration enables the size legend and includes the Size expression and the optional Size Aggregate function that reduces many Size values into a single one. Size Encoding works only with numeric values and breaks down data values into ranges that determine the size of symbols. It allows you to encode additional information in a line chart.

You can try setting the Size expression to {Budget} and the Size Aggregate to Average for the Radar Line Plot with Multiple Values Demo so that the plot would visualize the average budget for each genre using the size of the symbols.

Size Encoding Example

Note: The Size property is the collection, but the Line plot takes the first item only.

Line and Symbols look-and-feel

The following properties allow you to fine-tune the outfit of symbols and lines that form a Radar Line plot. You can see their effect in action by modifying the configuration of any radar line demo.

The Opacity and Symbol Opacity are numbers in percentage that determine the opacity of the line and symbols, respectively. Thus, 100% means they are opaque, and 0% means that they are entirely transparent.

The Line Aspect property determines the style of the line that connects data points.

  • Default means the straight line
  • Spline means the bezier curve
  • Step Center, Step Left and Step Right are not applicable for a Radar Line plot.

The Show Nulls property indicates the arrangement of data points for Null values.

  • Gaps means that the plot will not draw line segments between a null data point and its previous and next points
  • Zero means that null data points will be considered to have 0 value
  • Connected means that the plot will connect the previous and the following points of a null point

The Clipping Mode indicates the manner that the plot area draws a plot:

  • Fit value means that the plot area should use all the available space to fit the plot
  • Clip value means that the plot area cuts off the plot on the edge of its right or bottom padding
  • None value equals to Fit

The line properties in the Style section overwrite any other line color settings, including the Color Encoding that we described earlier.

The line properties, the Background Color expression, the Symbol Shape and the Show Symbols flag allow you to set up the appearance of symbols. For example, if the Symbol Shape is Auto, then the plot either picks the default value or applies the Shape Encoding that we described earlier.

The Start Angle is a number in arcdegree that defines the rotation of the plot clockwise. Full rotation is 360 degrees.

Tooltip and Labels Template

The data point symbols can display tooltips and labels with the following content that you can set up using the Tooltip Template and Label Text Template expressions, respectively.

You can choose one of the following values in the drop-down list.

  • Value Field Name usually means the field name bound to a Data Value.
  • Value Field Value means the current Data Value within the containing Category or Details.
  • Percentage In Details means the percentage share of the current Data Value among all the values with the same Details.
  • Percentage In Category means the percentage share of the current Data Value among all the values with the same Category.
  • Category Field Name usually means the field name bound to the Category Encoding.
  • Category Field Value means the current Category Encoding value.
  • Details Field Name usually means the field name bound to the Details Encoding.
  • Details Field Value means the current Details Encoding value.
  • Color Field Name usually means the field name bound to the Color Encoding.
  • Color Field Value means the current Color Encoding value.
  • Shape Field Name usually means the field name bound to the Shape Encoding.
  • Shape Field Value means the current Shape Encoding value.
  • Size Field Name usually means the field name bound to the Size Encoding.
  • Size Field Value means the current Size Encoding value.

Also, you could use the template's Expression Editor to set the formatting for these values using the interpolation syntax and supported format strings. For instance, you can set the Label Text Template to {valueField.value:N2} in the Radar Line Plot with Multiple Lines Demo to display the average rating with two decimal places.

Labels Appearance

A subset of text properties in the Label Text section and the line properties in the Label Border section allow you to set up the corresponding visual parameters of the plot labels.

The Label Position and an optional Offset in pixels determine the location of labels relative to a parent data point symbol:

  • Inside - inside the area formed by lines connecting data points
  • Outside - outside of the area formed by lines connecting data points
  • Center - near the data point
  • Auto - equals to Outside

The Overlapping Labels property indicates the handling of overlapping labels. Possible values are:

  • Auto - hides some labels to prevent the overlapping
  • Show - shows all labels even if the overlapping persists

The line properties in the Label Line section allows you to add the connecting lines between labels and their parent data points. The Label Line Position determines the connection point of a label's bounding box and the line:

  • Auto - selected automatically
  • Center - on the center of the bounding box side

Dynamic Rules

The Rules configuration allows you to create if this then that rules based on one or more data conditions to apply to the plot appearance. A condition is an expression that may refer to one of the following values:

  • Chart!CurrentData - the current Data Value
  • Chart!PreviousData - the previous Data Value
  • Chart!NextData - the next Data Value
  • Chart!CurrentCategory - the current Category Encoding value
  • Chart!PreviousCategory - the previous Category Encoding value
  • Chart!NextCategory - the next Category Encoding value
  • Chart!CurrentDetail - the current Details Encoding value
  • Chart!PreviousDetail - the previous Details Encoding value
  • Chart!NextDetail - the next Details Encoding value

A condition expression can also include references to report parameters and standard operators. The easiest way to build a condition is to use the expression editor that you can open by click on the box on the right side of the Condition property.

The following visual properties of a Radar Line plot can be applied when a condition is met:

  • The background color of a data point symbol
  • The border color of a data point symbol
  • The border width of a data point symbol
  • The border style of a data point symbol
  • The tooltip and label template

For instance, you can set the following rules for the plot in the Radar Line Plot with Multiple Lines Demo to apply a custom background color to the data points that have a value greater than 50.

As a result, the output of the chart will be like this:

Action

This group of properties determine the Interactive Action when a report reader clicks a data point symbol. You can use bound field references to pass parameters in a drill-through report or configure a dynamic bookmark or URL. The field value is evaluated in the scope of the current detail or category. Visit the Drill-Through Reports Walkthrough for more information. It explains how to set up the drill-through column plot, but the same technique applies to a radar line plot.