Nightingale rose chart

info

Charts are available with Avalonia Pro.

The Nightingale rose chart is a polar area chart with equal angles and variable radii. It is useful when you want a circular alternative to a bar chart while keeping one value per category.

When to use

• Seasonal summaries: Comparing one measurement across months or quarters.
• Category comparison: Showing relative magnitude without using Cartesian axes.
• Circular dashboards: Using a radial layout when the categories form a cycle.

Code example

XAML

<charts:NightingaleRoseChart Name="NightingaleRoseSample"
                               Title="Monthly Sales"
                               Height="350"
                               ShowLabels="True"
                               ItemsSource="{Binding NightingaleData}"
                               ValuePath="Value"
                               LabelPath="Label" />

Data model (C#)

public record RadialPoint(string Label, double Value);

public ObservableCollection<RadialPoint> NightingaleData { get; } = new()
{
    new("Jan", 120.0), new("Feb", 180.0), new("Mar", 160.0),
    new("Apr", 200.0), new("May", 280.0), new("Jun", 350.0),
    new("Jul", 380.0), new("Aug", 340.0), new("Sep", 250.0),
    new("Oct", 180.0), new("Nov", 140.0), new("Dec", 160.0)
};

Common properties

Property	Description	Default
ItemsSource	The collection of segments.	null
ValuePath	Radius magnitude of each segment.	null
LabelPath	Category label for each segment.	null
InnerRadiusFactor	Inner radius ratio, where 0.0 creates a solid rose chart.	0.0
ShowLabels	Whether to display segment labels.	true
ShowValues	Whether to display numeric values with the labels.	false
IsHighlightEnabled	Enables hover highlighting for segments.	false