wmsclient.aspx.cs

GIS WEB系统

using System;
using System.Data;
using System.Drawing;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class WmsClient : System.Web.UI.Page
{
	private double Zoom;
	private SharpMap.Geometries.Point Center;

	protected void Page_Load(object sender, EventArgs e)
	{
		if (Page.IsPostBack) 
		{
			//Page is post back. Restore center and zoom-values from viewstate
			Center = (SharpMap.Geometries.Point)ViewState["mapCenter"];
			Zoom = (double)ViewState["mapZoom"];
		}
		else
		{
			Center = new SharpMap.Geometries.Point(0,0);
			Zoom = 360;
			//Create the map
			GenerateMap();
		}
		PrintWmsInfo();
	}

	private void PrintWmsInfo()
	{
		
		SharpMap.Layers.WmsLayer layWms = MapHelper.GetWmsLayer();
		//Get request url for WMS
		hlWmsImage.NavigateUrl = layWms.GetRequestUrl(
			new SharpMap.Geometries.BoundingBox(Center.X - Zoom * 0.5, Center.Y - Zoom * 0.25,
			Center.X + Zoom * 0.5, Center.Y + Zoom * 0.25), new Size((int)imgMap.Width.Value, (int)imgMap.Height.Value));

		litLayers.Text = "<p><b>WMS Title</b>: " + layWms.ServiceDescription.Title + "<br/>Abstract: <i>"+layWms.ServiceDescription.Abstract + "</i>";
		litLayers.Text += "<br/><b>WMS Layers:</b><br/>";
		
		foreach (SharpMap.Web.Wms.Client.WmsServerLayer layer in layWms.RootLayer.ChildLayers)
			PrintLayers(layer, layWms);
		litLayers.Text += "</ul></p>";
	}
	/// <summary>
	/// Recursive function for retriving layer names
	/// </summary>
	/// <param name="layer"></param>
	/// <param name="layWms"></param>
	private void PrintLayers(SharpMap.Web.Wms.Client.WmsServerLayer layer, SharpMap.Layers.WmsLayer layWms)
	{
		litLayers.Text += "<li>" + layer.Name;
		if (layWms.LayerList.Contains(layer.Name))
			litLayers.Text += " (Enabled)";
		litLayers.Text += "</li>";

		if (layer.ChildLayers != null && layer.ChildLayers.Length > 0)
		{
			litLayers.Text += "<ul>";
			foreach (SharpMap.Web.Wms.Client.WmsServerLayer childlayer in layer.ChildLayers)
				PrintLayers(childlayer,layWms);
			litLayers.Text += "</ul>";
		}
	}
	protected void imgMap_Click(object sender, ImageClickEventArgs e)
	{
		//Set center of the map to where the client clicked
		//We set up a simple empty map so we can use the ImageToWorld() method for easy conversion from Image to World coordinates
		SharpMap.Map myMap = new SharpMap.Map(new Size(Convert.ToInt32(imgMap.Width.Value), Convert.ToInt32(imgMap.Height.Value)));
		myMap.Center = Center; myMap.Zoom = Zoom;
		Center = myMap.ImageToWorld(new System.Drawing.Point(e.X, e.Y));

		//Set zoom value if any of the zoom tools were selected
		if (rblMapTools.SelectedValue == "0") //Zoom in
			Zoom = Zoom * 0.5;
		else if (rblMapTools.SelectedValue == "1") //Zoom out
			Zoom = Zoom * 2;
		//Create the map
		GenerateMap();
	}
  
	/// <summary>
	/// Creates the map, inserts it into the cache and sets the ImageButton Url
	/// </summary>
	private void GenerateMap()
	{
		//Save the current mapcenter and zoom in the viewstate
		ViewState.Add("mapCenter", Center);
		ViewState.Add("mapZoom", Zoom);
		string ResponseFormat = "maphandler.ashx?MAP=WmsClient&Width=[WIDTH]&Height=[HEIGHT]&Zoom=[ZOOM]&X=[X]&Y=[Y]";
		System.Globalization.NumberFormatInfo numberFormat_EnUS = new System.Globalization.CultureInfo("en-US", false).NumberFormat;
		imgMap.ImageUrl = ResponseFormat.Replace("[WIDTH]", imgMap.Width.Value.ToString()).
									  Replace("[HEIGHT]", imgMap.Height.Value.ToString()).
									  Replace("[ZOOM]", Zoom.ToString(numberFormat_EnUS)).
									  Replace("[X]", Center.X.ToString(numberFormat_EnUS)).
									  Replace("[Y]", Center.Y.ToString(numberFormat_EnUS));
		hlCurrentImage.NavigateUrl = imgMap.ImageUrl;
	}
}