public partial class Main : Form

{

/// <summary>

/// The routing system class provides a wrapper for the system.

/// 1 Create Instance

/// 2 Pass vector layer

/// 3 Pass point for the source

/// 4 Pass point for the destination

/// 5 Call calcualte method. 2 MUST be done before 3,4,5 or the mayans will be proved right.

/// </summary>

RoutingSystem.RoutingSystem TheRoutingEngine;

public static string BASEMAPLAYERNAME = "BASEMAP";

public Main()

{

InitializeComponent();

TheRoutingEngine = new RoutingSystem.RoutingSystem();

}

/// <summary>

/// Opens a shape file. Hopefully.

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void btnOpenShapeFile_Click(object sender, EventArgs e)

{

try

{

OpenFileDialog OfD = new OpenFileDialog();

OfD.InitialDirectory = Application.StartupPath + "\\TestData\\";

OfD.Filter = "Shape Files (*.shp)|*.shp";

if (OfD.ShowDialog() == System.Windows.Forms.DialogResult.OK)

{

if (OfD.CheckFileExists)

{

// The file should be there so we create a new layer with the name

if (!LoadTheBasicLayerIntoSharpMap(OfD.FileName))

{

MessageBox.Show("Something Went Very Very Wrong.", "Unable To Load The Shape File.", MessageBoxButtons.OK, MessageBoxIcon.Error);

return;

}

}

}

}

catch (Exception)

{

MessageBox.Show("Danger, Will Robinson, Danger.", "Cant open the shape file", MessageBoxButtons.OK, MessageBoxIcon.Information);

return;

}

}

private bool LoadTheBasicLayerIntoSharpMap(string p)

{

try

{

SharpMap.Layers.VectorLayer temp = null;

foreach (SharpMap.Layers.VectorLayer tLayer in mapBox1.Map.Layers)

{

if (tLayer.LayerName == Main.BASEMAPLAYERNAME)

temp = tLayer;

}

mapBox1.Map.Layers.Remove(temp);

SharpMap.Layers.VectorLayer TheLayer = new SharpMap.Layers.VectorLayer(Main.BASEMAPLAYERNAME);

TheLayer.DataSource = new SharpMap.Data.Providers.ShapeFile(p);

mapBox1.Map.Layers.Add(TheLayer);

mapBox1.Map.ZoomToExtents();

mapBox1.Refresh();

mapBox1.Update();

// The Routing Engine needs a copy of the layer.

TheRoutingEngine.AnalysisLayer = TheLayer;

return true;

}

catch (Exception)

{

return false;

}

}

private void button1_Click(object sender, EventArgs e)

{

var theShortestPath = TheRoutingEngine.PerformShortestPathAnalysis(false);

if (theShortestPath == null)

{

label4.Text = "No Path Found.";

System.Diagnostics.Debug.WriteLine("Either a problem occured or there was no connecting path.");

}

else

{

// THIS NEXT BIT ONLY DISPLAYS THE PATH ON THE MAP, AND SOME PATH LENGTH INFORMATION

RemoveShortestPathLineFromMapIfPresent();

SharpMap.Layers.VectorLayer GraphicsLayer = GetGraphicsLayer(theShortestPath);

mapBox1.Map.Layers.Add(GraphicsLayer);

mapBox1.Refresh();

mapBox1.Update();

label4.Text = "Shortest Path Length: " + Math.Round(theShortestPath.Length, 2);

}

// END OF MAP DISPLAY BIT

}

/// <summary>

/// This method just takes a linestring representing a shortest path and turns into a vector layer

/// </summary>

/// <param name="TheShortestPath">The Line string of the shortest path</param>

/// <returns>The Vector Layer</returns>

private static VectorLayer GetGraphicsLayer(ILineString TheShortestPath)

{

try

{

Collection<IGeometry> GeomCollection = new Collection<IGeometry>();

GeomCollection.Add(TheShortestPath);

VectorLayer VLayer = new VectorLayer("SPGL");

VLayer.DataSource = new SharpMap.Data.Providers.GeometryProvider(GeomCollection);

VLayer.Style.Line = new Pen(Color.Red, 3);

return VLayer;

}

catch (Exception)

{

return null;

}

}

/// <summary>

/// removes the shortest path from the map if already present.

/// </summary>

private void RemoveShortestPathLineFromMapIfPresent()

{

var tempLayer = new VectorLayer("SPGL");

foreach (VectorLayer VL in mapBox1.Map.Layers)

if (VL.LayerName == "SPGL")

{

tempLayer = VL;

}

mapBox1.Map.Layers.Remove(tempLayer);

}

private void mapBox1_MouseDown(Coordinate worldPos, MouseEventArgs imagePos)

{

if (imagePos.Button == System.Windows.Forms.MouseButtons.Left)

TheRoutingEngine.UserSource = worldPos;

if (imagePos.Button == System.Windows.Forms.MouseButtons.Right)

TheRoutingEngine.UserDestination = worldPos;

}

}