Cassowary constraint solver and WPF panel allowing for constraint-based layout
C#
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README.md

CassowaryNET

A pure .NET implementation of the Cassowary incremental linear constraint solver. See this link.

Incremental solving results in signficantly better performance than fully re-solving all constraints every time, making UI layout an ideal application for this solver.

This library makes use of operator overloading to allow for simple expression of complex constraints.

Example

var x = new Variable(20d);
var y = new Variable(10d);

var solver = new CassowarySolver();
    
solver.AddConstraint(x <= 5d);
solver.AddConstraint(x == y);

solver.Solve();
    
// x.Value == 5d
// y.Value == 5d

LayoutNET

A WPF control (AutoLayoutPanel) that allows you to add child controls and define their layout in terms of linear relationships and constraints with other controls.

Constraints can be created between Left, HCenter, Right, Top, VCenter, Bottom, Width and Height properties of controls.

Example

<layout:AutoLayoutPanel
    x:Name="MainPanel">
        
    <!-- Horizontally and vertically centered in the panel. Width is between 100 and 300. -->
    <Button 
        x:Name="Button1"
        Content="Button1"
        layoutNet:AutoLayoutPanel.Constraints="
            [VCenter] equalto [MainPanel.VCenter];
            [HCenter] equalto [MainPanel.HCenter];
            [Width] greaterthan [100];
            [Width] lessthan [300];"/>

    <!-- Horizontally centred with Button1. Top is 10 below the bottom of Button1. -->
    <Button 
        x:Name="Button2"
        Content="Button2"
        layoutNet:AutoLayoutPanel.Constraints="
            [Top] equalto [Button1.Bottom + 10];
            [HCenter] equalto [Button1.HCenter];"/>

</layout:AutoLayoutPanel>