Parliament chart

info

Charts are available with Avalonia Pro.

Parliament charts arrange seats in a semicircle so party representation can be read as both totals and spatial balance.

When to use

• Legislative composition: Show seat distribution by party or bloc.
• Board representation: Visualize committee or council membership.
• Proportional allocation: Present seat-based outcomes with a familiar hemicycle layout.

Code example

XAML

<charts:ParliamentChart Title="Parliament seats"
                                  Height="320"
                                  TotalSeats="120"
                                  Parties="{Binding Parties}" />

Data model (C#)

public ObservableCollection<ParliamentParty> Parties { get; } = new()
{
    new() { Name = "Alliance", Seats = 46, Color = Colors.SteelBlue },
    new() { Name = "Coalition", Seats = 38, Color = Colors.OrangeRed },
    new() { Name = "Green", Seats = 22, Color = Colors.ForestGreen },
    new() { Name = "Independent", Seats = 14, Color = Colors.Gray }
};

Common properties

Property	Description	Default
TotalSeats	Total number of seats to draw.	100
Rows	Number of concentric seat rows.	4
InnerRadiusFactor	Inner radius factor for the hemicycle.	0.4
SeatGap	Gap between seats.	2.0
StartAngle	Start angle in degrees for the left edge of the hemicycle.	180.0
EndAngle	End angle in degrees for the right edge of the hemicycle.	0.0
Parties	Collection of ParliamentParty items that define seat allocation.	null

Common properties (ParliamentParty)

Property	Description	Default
Name	Party or bloc name.	string.Empty
Seats	Number of seats assigned to the party.	0
Color	Color used to draw the party's seats.	Gray

See also

• Pie chart
• Mekko chart