C

C#•2y ago

clover

msgal null refernce exeption

Im using Msgal to print show a graph thats used in my Program. I'm trying to setup a simple graph for testing but when the line graphViewer.Graph = graph; is called I get the exeption in the picture. The code is on startup of the panel where my graph should be displayed in


public partial class Graph : Page
{
public Graph()
{
InitializeComponent();

DockPanel graphViewerPanel = new DockPanel();


Microsoft.Msagl.Drawing.Graph graph = new Microsoft.Msagl.Drawing.Graph("graph");

graph.AddEdge("A", "B");
graph.AddEdge("B", "C");
graph.AddEdge("A", "C").Attr.Color = Microsoft.Msagl.Drawing.Color.Green;
graph.FindNode("A").Attr.FillColor = Microsoft.Msagl.Drawing.Color.Magenta;
graph.FindNode("B").Attr.FillColor = Microsoft.Msagl.Drawing.Color.MistyRose;
Microsoft.Msagl.Drawing.Node c = graph.FindNode("C");
c.Attr.FillColor = Microsoft.Msagl.Drawing.Color.PaleGreen;
c.Attr.Shape = Microsoft.Msagl.Drawing.Shape.Diamond;
GraphViewer graphViewer = new GraphViewer();
graph.Attr.LayerDirection = LayerDirection.LR;
//graph.LayoutAlgorithmSettings.EdgeRoutingSettings.EdgeRoutingMode = EdgeRoutingMode.Rectilinear;

var global = (SugiyamaLayoutSettings)graph.LayoutAlgorithmSettings;
var local = (SugiyamaLayoutSettings)global.Clone();
local.Transformation = PlaneTransformation.Rotation(Math.PI / 2);
graph.LayoutAlgorithmSettings = local;


graphViewer.Graph = graph;
graphViewer.BindToPanel(graphViewerPanel);
Main.Children.Add(graphViewerPanel);


}
}