POC to draw XY axis diagram using MVVM pattern


I am evaluating this library for WPF.
I want to implement a POC which shows nodes & links with X and Y axis using MVVM pattern.
X Axis -> Distance
Y Axis -> Name

Please provide me a sample application which implements this basic functionality to proceed.


Sure, here’s the start of your kind of diagram:

<!-- Copyright © Northwoods Software Corporation, 2008-2016. All Rights Reserved. -->

<UserControl x:Class="XYChart.XYChart"

    <!-- Node DataTemplates -->
    <go:DataTemplateDictionary x:Key="DTD">

      <!-- the default template -->
      <DataTemplate x:Key="">
        <go:SpotPanel go:Node.Location="{Binding Path=Data.Location}"
          <Ellipse x:Name="myCircle"
                   Fill="{Binding Path=Data.Color}" Stroke="{x:Null}"
                   Width="8" Height="8" />
          <TextBlock Text="{Binding Path=Data.Text}"
                     go:SpotPanel.Spot="MiddleTop" go:SpotPanel.Alignment="MiddleBottom">
              <RotateTransform Angle="-45" />
      <!-- templates for axis labels -->
      <DataTemplate x:Key="LabelY">
        <TextBlock Text="{Binding Path=Data.Text}"
                   go:Node.Location="{Binding Path=Data.Location}"
                   go:Node.LocationSpot="MiddleRight" />
      <DataTemplate x:Key="LabelX">
        <TextBlock Text="{Binding Path=Data.Text}"
                   go:Node.Location="{Binding Path=Data.Location}"
                   go:Node.LocationSpot="MiddleTop" />

    <DataTemplate x:Key="LinkTemplate">
        <go:LinkShape Stroke="{Binding Path=Link.FromNode.Data.Color}" />

    <go:Diagram x:Name="myDiagram"
                NodeTemplateDictionary="{StaticResource DTD}"
                LinkTemplate="{StaticResource LinkTemplate}"
        <go:GridPattern CellSize="50 100">
          <!-- vertical lines -->
          <Path Stroke="LightGray" StrokeThickness="1"
                go:GridPattern.Figure="VerticalLine" />
          <!-- horizontal lines -->
          <Path Stroke="LightGray" StrokeThickness="1"
                go:GridPattern.Figure="HorizontalLine" />
      <!-- the vertical axis -->
        <Line go:Node.Location="0 0"
              X1="0" Y1="0" X2="0" Y2="300"
              go:Part.Selectable="False" />
      <!-- the horizontal axis -->
        <Line go:Node.Location="0 300"
              X1="0" Y1="0" X2="300" Y2="0"
              go:Part.Selectable="False" />

And here’s how the model was built in code:

/* Copyright © Northwoods Software Corporation, 2008-2016. All Rights Reserved. */

using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
using Northwoods.GoXam.Model;

namespace XYChart {
  public partial class XYChart : UserControl {
    public XYChart() {

      // create the diagram's data model
      var model = new GraphModel<Dot, int>();
      model.NodesSource = new ObservableCollection<Dot>() {
        // don't use Key==0
        new Dot() { Category="LabelY", Location=new Point(0, 100), Text="VDV\nTLP" },
        new Dot() { Key=1, Location=new Point(10, 100), Text="1" },
        new Dot() { Key=2, Location=new Point(20, 100), Text="2" },
        new Dot() { Key=3, Location=new Point(30, 100), Text="3" },
        new Dot() { Key=4, Location=new Point(50, 100), Text="4" },
        new Dot() { Key=5, Location=new Point(130, 100), Text="5" },
        new Dot() { Key=6, Location=new Point(150, 100), Text="6" },
        new Dot() { Key=101, Location=new Point(50, 50), ToKeys=new ObservableCollection<int>() { 1, 2, 3, 4 } },
        new Dot() { Key=102, Location=new Point(150, 50), ToKeys=new ObservableCollection<int>() { 5, 6 } },

        new Dot() { Category="LabelY", Location=new Point(0, 200), Text="Stopping\nPoint" },
        new Dot() { Key=11, Location=new Point(40, 200), Text="SP(1)", ToKeys=new ObservableCollection<int>() { 12 }, Color="Green" },
        new Dot() { Key=11, Location=new Point(90, 200), Text="SP(2)", ToKeys=new ObservableCollection<int>() { 13 }, Color="Green" },
        new Dot() { Key=11, Location=new Point(120, 200), Text="SP(3)", ToKeys=new ObservableCollection<int>() { 14 }, Color="Green" },
        new Dot() { Key=11, Location=new Point(160, 200), Text="SP(4)", ToKeys=new ObservableCollection<int>() { }, Color="Green" },

        new Dot() { Category="LabelX", Location=new Point(50, 300), Text="500" },
        new Dot() { Category="LabelX", Location=new Point(100, 300), Text="1000" },
        new Dot() { Category="LabelX", Location=new Point(150, 300), Text="1500" },
        new Dot() { Category="LabelX", Location=new Point(200, 300), Text="2000" },
        new Dot() { Category="LabelX", Location=new Point(250, 300), Text="2500" }
      myDiagram.Model = model;
      //this.DataContext = model;

  // the data for each node
  public class Dot : GraphModelNodeData<int> {
    public Dot() {
      this.Location = new Point(0, 0);

    public string Color
      get { return _Color; }
        if (_Color != value) {
          string old = _Color;
          _Color = value;
          RaisePropertyChanged("Critical", old, value);
    private string _Color = "Black";

The above code produces this diagram:

Hello Walter,

Thanks for your quick response. It really helped to start up.

I also need the further assistance to extend in the same example by adding other properties of ‘Dot’ class like Image, tooltiptext and so on to cover the following further requirements:

  1. Only Y axis nodes should be allowed to move (to change only Y location, no change in X location) & accordingly all other nodes on the same Y location, should automatically be moved accordingly. Ex: If you move ‘VDV\nTLP’ along y axis, then all nodes 1,2,3,4,5,6 along with connection lines should be moved automatically.

  2. Different images for different nodes. Ex: SP(1) & SP(2) with different image (.jpg)

  3. Tooltip on mouse move for nodes & connection lines

  4. Labels on connecting lines of nodes. (Ex: Text on connection line b/w SP(1) and (SP(2) and so on…)

  5. Zoom in / out function to zoom only along X axis, means scale should be applied on X location, but not on Y location.

  6. Print function

Please provide me the solution as soon as possible.


For images and tooltips, as a .NET developer you should already know how to do those in XAML.

For link labels and printing, please read the GoXam Introduction PDF document.

For “zooming” along only one axis, please read Controlling element sizes when zooming

For your first requirement, I suggest that you change the implementation of those Y axis labels to be Groups rather than regular Nodes. Then if you assign all of those nodes (1, 2, 3, …) to be members of the desired groups, by setting GraphModelNodeData.SubGraphKey, when the user drags the group, all of its member nodes will move too. You will probably want to define a DataTemplate that does not use a GroupPanel. Read the GoXamIntro.pdf file for more information.

To permit users from manipulating the diagram, you’ll want to turn off Diagram.IsReadOnly. You may want to set other properties to control what users may do. Read the GoXamIntro.pdf file for more information about permissions.

To prevent them from moving Groups sideways, but only up and down, set go.Node.MinLocation and go.Node.MaxLocation to Point values that have NaN as the X value.