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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.
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.
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.
If you add a chart into a report, set the plot type to Radar Line
on the first page of the Chart Wizard
, and click the Next
button, the wizard shows the Radar Line Settings
page that looks like the following:
The Data Values
section allows you to add one or more Data Values.
The Data Categories
section allows you to set the Category Encoding.
The Data Subcategories
section allows you to configure the Details Encoding.
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. The Properties Panel displays the Value
as the collection, but Radar Line
plots take the first item only. The Chart Wizard displays the Value
as Field
.
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. You can set the displayed name by using the Caption
property of a data value item.
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.
The Chart Wizard
offers the simplified editor of the Category Encoding
in the Data Categories
section where a single Category Expression
displayed as Field
is available. The Sorting
configuration of the Category Encoding
displays the Sort direction
property only. The Sort Expression
is automatically set to the Field
value.
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.
The Chart Wizard
offers the simplified editor of the Details Encoding
in the Data Subcategories
section:
A single Details Encoding
item is available.
A single Value
item displayed as Field
is available.
The Sorting
configuration of the Details Encoding
displays the Sort direction
property only. The Sort Expression
is automatically set to the Field
value.
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.
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.
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.
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.
Note: The Size
property is the collection, but the Line
plot takes the first item only.
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.
The Text Encoding
collection offers a way to configure radar line plots to display customized labels and tooltips on the data point symbols. Each item within this collection has the following properties:
Values
: This is an expression that can reference the values of the bound fields.
Aggregate
: This optional function, such as Count
or Average
, can condense multiple field values into a single value, evaluated within the current detail or category context.
Template Key
: A string used within the Labels or Tooltip template to represent the text encoding item.
Target
: This property specifies whether the text encoding item is meant for the plot's labels or tooltips.
Adding items to the Text Encoding
collection allows automatic display of configured values in Labels or Tooltips, based on the Target
value of each item. To further customize the text of the labels and tooltips, you can employ the Tooltip Template
and Label Text Template
expressions.
Apart from Text Encoding items referenced by their keys, you can utilize the following pre-defined values:
{valueField.name}
: Represents the field name bound to a Data Value.
{valueField.value}
: Represents the current Data Value within the containing Category or Details.
{PercentageDetail}
: Represents the percentage share of the current Data Value among all values within the same Details.
{PercentageCategory}
: Represents the percentage share of the current Data Value among all values within the same Category.
{categoryField.name}
: Represents the field name bound to the Category Encoding.
{categoryField.value}
: Represents the current Category Encoding value.
{detailFields.name}
: Represents the field name bound to the Details Encoding.
{detailFields.value}
: Represents the current Details Encoding value.
{colorField.name}
: Represents the field name bound to the Color Encoding.
{colorField.value}
: Represents the current Color Encoding value.
{shapeField.name}
Represents the field name bound to the Shape Encoding.
{shapeField.value}
Represents the current Shape Encoding value.
{sizeField.name}
Represents the field name bound to the Size Encoding.
{sizeField.name}
Represents the current Size Encoding value.
These values can be combined and formatted using the interpolation syntax and supported format strings that are also used for the TextBox Report Item.
For example, the plot in the Radar Line Plot with Multiple Lines Demo uses an advanced tooltip configuration:
The Text Encoding
contains the SalesQuantity
element that displays the number of sold items:
Aggregate
= Max
Value
= {RottenTomatoesRating}
Target
= Tooltip
TemplateKey
= MaxRating
The Tooltip Template
is configured with the following expression:
Max Rating: {MaxRating}
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
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:
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.