IntervalGraph

IntervalGraph is a library that allows you to create interval graphs from mathematics. With this library, you can create graphs like the following:

X ∈ (−∞, 7] U (14, 21)

Installation

You can either follow this link to download the NuGet package or use the package manager in Visual Studio.

For use in XAML code, specify:

xmlns:gi="clr-namespace:IntervalGraph.Components;assembly=IntervalGraph"

Example Usage

Let's consider the same example with the interval: X ∈ (−∞, 7] U (14, 21)

First, create your control element:

<gi:IntervalGraph Height="200" Width="600" HorizontalAlignment="Left" VerticalAlignment="Top"
                 MajorStep="2" MajorThickness="1" MinorStep="0"
                 GraphIntervals="{Binding GraphIntervals}" >

    <c:IntervalGraph.IntAxis>
        <c:IntAxis FontSize="13" NumStep="2" CirclesRadius="3"/>
    </c:IntervalGraph.IntAxis>

</gi:IntervalGraph>

The most important property here is GraphIntervals. The intervals will be created based on the contents of this property.

(For more information about IntervalGraph, you can learn more here).

To create our interval, we need to split it into two parts:

1. (−∞, 7]
2. (14, 21)

Next, in your ViewModel, create an ObservableCollection<GraphInterval> and populate it with intervals:

List<GraphInterval> intervals = new List<GraphInterval>()
{
    new GraphInterval()
    {
        LastPoint = new IntervalPoint()
        {
            X = 7,
            IsInclusive = true
        },

        StrokeBrush = Brushes.Red,
        FillBrush = new SolidColorBrush(Color.FromArgb(30,255,0,0))
    },

    new GraphInterval()
    {
        FirstPoint = new IntervalPoint()
        { 
            X = 14 
        },

        LastPoint = new IntervalPoint()
        { 
            X = 21
        },

        StrokeBrush = Brushes.Red,
        FillBrush = new SolidColorBrush(Color.FromArgb(30,255,0,0))
    },
};

GraphIntervals = new ObservableCollection<GraphInterval>(intervals);

To create intervals, you will use the GraphInterval class, which has properties FirstPoint and LastPoint of type IntervalPoint.

• FirstPoint == null => (−∞ , ...
• LastPoint == null => ... ; +∞)

Documentation Links

• IntervalGraph
• IntAxis
• Interval
• GraphInterval
• IntervalPoint