MapInfo MapXtreme 2005 WebGIS上实现简单鹰眼设计！

Posted on 2006-10-17 12:28 东人EP 阅读(6620) 评论(7) 编辑收藏引用所属分类: MapInfo

我在2005上研究了好长时间，才弄出来个简单的鹰眼，与大家分享，我的设计思路是将后台设置两个map ，map1和map2，map1为主地图，map2为鹰眼地图，但是map2没有MapControl，定义一个实现类继承于MapBaseCommand，将map1.Bounds的矩形在map2上转换为System.Drawing.Rectangle，之后将这个Rectangle的左上坐标和width，height传到客户端，应用JS进行客户端绘图，在客户端加入一个Div，Div里放置一个IMG，如下为部分代码：
自定义类：

using System;
2

using System.Collections;
3

using System.Drawing;
4

using System.IO;
5

using System.Web;
6

using System.Web.UI.WebControls;
7

using System.Web.UI;
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using MapInfo.Mapping;
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using MapInfo.Data;
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using MapInfo.WebControls;
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namespace CustomWebTools
14

{
15

/// <summary>
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/// Info command for InfoWebTool.
17

/// </summary>
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[Serializable]
19

public class Info : MapInfo.WebControls.MapBaseCommand
20

{
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/// <summary>
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/// Key to be used to get the pixel tolerance parameter value from the URL.
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/// </summary>
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protected const string PixelToleranceKey = "PixelTolerance";
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protected const string InfoCommand = "Info";
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/// <summary>
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/// Constructor for Info class
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/// </summary>
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public Info()
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{
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Name = InfoCommand;
34

}
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/// <summary>
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/// Override the Execute method in MapBasicCommand class to not save state, because
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/// for info tool, which does not change map state, so there is no need to save map state.
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/// </summary>
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public override void Execute()
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{
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StateManager sm = StateManager.GetStateManagerFromSession();
44

if (sm == null)
45

{
46

if(StateManager.IsManualState())
47

{
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throw new NullReferenceException("Cannot find instance of StateManager in the ASP.NET session.");
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}
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}
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ParseContext();
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if(sm != null)
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{
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PrepareStateManagerParamsDictionary(sm);
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sm.RestoreState();
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}
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Process();
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}
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/// <summary>
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/// method to do the real server side process for info tool.
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/// </summary>
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public override void Process()
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{
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//get pixel tolerance from url of client side.
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int pixelTolerance = System.Convert.ToInt32(HttpContext.Current.Request[PixelToleranceKey]);
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MapControlModel model = MapControlModel.GetModelFromSession();
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model.SetMapSize(MapAlias, MapWidth, MapHeight);
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//extract points from url of client side.
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System.Drawing.Point[] points = ExtractPoints(DataString);
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//do searching and get results back
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MultiResultSetFeatureCollection mrfc = RetrieveInfo(points, pixelTolerance);
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IEnumerator resultEnum = mrfc.GetEnumerator();
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//retrieve the selected feature from collection
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while(resultEnum.MoveNext())
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{
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IResultSetFeatureCollection irfc = (IResultSetFeatureCollection)resultEnum.Current;
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IFeatureEnumerator ftrEnum = irfc.GetFeatureEnumerator();
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while(ftrEnum.MoveNext())
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{
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Feature ftr = (Feature)ftrEnum.Current;
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//create a html table to display feature info and stream back to client side.
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CreateInfoTable(ftr);
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irfc.Close();
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mrfc.Clear();
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break;
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}
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break;
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}
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}
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/// <summary>
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/// Creates html table to hold passed in feature info, and stream back to client.
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/// </summary>
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/// <param name="ftr">feature object</param>
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private void CreateInfoTable(Feature ftr)
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{
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//create a table control and populat it with the column name/value(s) from the feature returned and
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// and the name of the layer where the feature belong
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System.Web.UI.WebControls.Table infoTable = new System.Web.UI.WebControls.Table();
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//set table attribute/styles
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infoTable.CellPadding = 4;
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infoTable.Font.Name = "Arial";
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infoTable.Font.Size = new FontUnit(8);
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infoTable.BorderWidth = 1;
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//infoTable.BorderStyle = BorderStyle.Outset;
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115

System.Drawing.Color backColor = Color.Bisque;
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117

//add the first row, the layer name/value where the selected feature belongs
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TableRow r = new TableRow();
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r.BackColor = backColor;
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121

TableCell c = new TableCell();
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c.Font.Bold = true;
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c.ForeColor = Color.Indigo;
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c.Text = "Layer Name";
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r.Cells.Add(c);
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128

c = new TableCell();
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130

//the feature returned is from a resultset table whose name is got from appending _2
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//to the real table name, so below is to get the real table name.
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string alias = ftr.Table.Alias;
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c.Text = alias.Substring(0, alias.Length-2);
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c.Font.Bold = true;
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r.Cells.Add(c);
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137

infoTable.Rows.Add(r);
138

139

foreach(Column col in ftr.Columns)
140

{
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String upAlias = col.Alias.ToUpper();
142

//don't display obj, MI_Key or MI_Style columns
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if(upAlias != "OBJ" && upAlias != "MI_STYLE" && upAlias != "MI_KEY")
144

{
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r = new TableRow();
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r.BackColor = backColor;
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148

r.Cells.Clear();
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c = new TableCell();
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c.Text = col.Alias;
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c.Font.Bold = true;
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c.ForeColor = Color.RoyalBlue;
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154

r.Cells.Add(c);
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c = new TableCell();
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c.Text = ftr[col.Alias].ToString();
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r.Cells.Add(c);
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infoTable.Rows.Add(r);
159

}
160

}
161

162

//stream the html table back to client
163

StringWriter sw = new StringWriter();
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HtmlTextWriter hw = new HtmlTextWriter(sw);
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infoTable.RenderControl(hw);
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String strHTML = sw.ToString();
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HttpContext.Current.Response.Output.Write(strHTML);
168

}
169

170

/// <summary>
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/// Get a MultiFeatureCollection containing features in all layers falling into the tolerance of the point.
172

/// </summary>
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/// <param name="points">points array</param>
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/// <param name="pixelTolerance">pixel tolerance used when searching</param>
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/// <returns>Returns a MultiResultSetFeatureCollection object</returns>
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protected MultiResultSetFeatureCollection RetrieveInfo(Point[] points, int pixelTolerance)
177

{
178

if(points.Length != 1)
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return null;
180

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MapControlModel model = MapControlModel.GetModelFromSession();
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//get map object from map model
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MapInfo.Mapping.Map map = model.GetMapObj(MapAlias);
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if(map == null) return null;
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187

//creat a layer filter to include normal visible layers for searching
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IMapLayerFilter layerFilter = MapLayerFilterFactory.FilterForTools(
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map, MapLayerFilterFactory.FilterByLayerType(LayerType.Normal), MapLayerFilterFactory.FilterVisibleLayers(true),
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"MapInfo.Tools.MapToolsDefault.SelectLayers", null);
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ITableEnumerator tableEnum = map.Layers.GetTableEnumerator(layerFilter);
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194

//return if there is no valid layer to search
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if(tableEnum == null) return null;
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System.Drawing.Point center = points[0];
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199

//create a SearchInfo with a point and tolerance
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SearchInfo si = MapInfo.Mapping.SearchInfoFactory.SearchNearest(map, center, pixelTolerance);
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(si.SearchResultProcessor as ClosestSearchResultProcessor).Options = ClosestSearchOptions.StopAtFirstMatch;
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//retrieve all columns
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si.QueryDefinition.Columns = null;
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205

MapInfo.Geometry.Distance d = MapInfo.Mapping.SearchInfoFactory.ScreenToMapDistance(map, pixelTolerance);
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(si.SearchResultProcessor as ClosestSearchResultProcessor).DistanceUnit=d.Unit;
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(si.SearchResultProcessor as ClosestSearchResultProcessor).MaxDistance = d.Value;
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209

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//do search
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MultiResultSetFeatureCollection mrfc = MapInfo.Engine.Session.Current.Catalog.Search(tableEnum, si);
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return mrfc;
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214

}
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}
216

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/// <summary>
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/// ZoomValue command to write current zoom value to client for display.
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/// </summary>
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[Serializable]
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public class ZoomValue : MapInfo.WebControls.MapBaseCommand
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{
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/// <summary>
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/// Constructor for ZoomValue class
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/// </summary>
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public ZoomValue()
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{
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Name = "ZoomValue";
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}
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/// <summary>
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/// Override the Execute method in MapBasicCommand class to NOT save state, because
233

/// for this command, which does not change map state, so there is no need to save map state.
234

/// </summary>
235

public override void Execute()
236

{
237

238

StateManager sm = StateManager.GetStateManagerFromSession();
239

if (sm == null)
240

{
241

if(StateManager.IsManualState())
242

{
243

throw new NullReferenceException("Cannot find instance of StateManager in the ASP.NET session.");
244

}
245

}
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ParseContext();
247

if(sm != null)
248

{
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PrepareStateManagerParamsDictionary(sm);
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sm.RestoreState();
251

}
252

253

Process();
254

}
255

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public override void Process()
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{
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MapControlModel model = MapControlModel.GetModelFromSession();
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//get map object from map model
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MapInfo.Mapping.Map map = model.GetMapObj(MapAlias);
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MapInfo.Mapping.Map map2 = model.GetMapObj("Map2");
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System.Drawing.Rectangle rect;
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map2.DisplayTransform.ToDisplay(map.Bounds, out rect);
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HttpContext.Current.Response.Output.Write(rect.X);
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HttpContext.Current.Response.Output.Write(',');
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HttpContext.Current.Response.Output.Write(rect.Y);
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HttpContext.Current.Response.Output.Write(',');
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HttpContext.Current.Response.Output.Write(rect.Width);
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HttpContext.Current.Response.Output.Write(',');
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HttpContext.Current.Response.Output.Write(rect.Height);
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}
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}
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}
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客户端JS代码：

//client info command to control client behavior for info tool.
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function InfoCommand(name, interaction)
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{
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if (arguments.length > 0) {
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this.Init(name, interaction);
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}
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}
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InfoCommand.prototype = new MapCommand();
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InfoCommand.prototype.constructor = InfoCommand;
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InfoCommand.superclass = MapCommand.prototype;
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InfoCommand.prototype.Execute = function()
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{
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this.CreateUrl();
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this.AddParamToUrl("PixelTolerance", this.pixelTolerance);
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//create an XMLHttp obj to send request to server
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var xmlHttp = CreateXMLHttp();
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xmlHttp.open("GET", this.url, false);
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xmlHttp.send(null);
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//get response back
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this.result = xmlHttp.responseText;
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var div = FindElement("Info");
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if(div.style.visibility != "visible")
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div.style.visibility = "visible";
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//display the response at client html
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div.innerHTML = "<font size=2 face=Arial><b>Selected Feature Info:</b></font><p>" + this.result;
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};
29

//function to update zoom label
30

function getZoomValue()
31

{
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//create url to send to server, server command name is "ZoomValue"
33

var url = "MapController.ashx?Command=ZoomValue&Ran=" + Math.random();
34

var mapImage = document.getElementById("MapControl1_Image");
35

if (mapImage.mapAlias)
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url += "&MapAlias=" + mapImage.mapAlias;
37

var xmlHttp = CreateXMLHttp();
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xmlHttp.open("GET", url, false);
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xmlHttp.send(null);
40

var result = xmlHttp.responseText;
41

var div = FindElement("ZoomValue");
42

div.innerHTML = "<font size=2 face=Arial><b>Zoom: <font color=Indigo>" + result + "</font></b></font>";
43

var arr = new Array();
45

arr = result.split(',');
46

var left = 1*arr[0];
47

var top = 1*arr[1];
48

var width = 1*arr[2];
49

var height = 1*arr[3];
50

if (left < 0) left = 0;
51

if (top < 0) top = 0;
52

if (width > 232) width = 232;
53

if (height > 210) height = 210;
54

//alert(left+","+top+","+width+","+height);
55

myDrawFunction(left, top, width, height);
56

};
57

后台HTML文件代码：

<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="InfoToolWeb.WebForm1_temp" %>
2

<%@ Register TagPrefix="mapinfowebuiwebcontrols" Namespace="MapInfo.WebControls" Assembly="MapInfo.WebControls, Version=4.0.0.362, Culture=neutral, PublicKeyToken=0a9556cc66c0af57" %>
3

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
4

<HTML xmlns:v="urn:schemas-microsoft-com:vml">
5

<HEAD>
6

<title>WebForm1</title>
7

</style>
13

</HEAD>
15

<body bgColor="#ffefd5" MS_POSITIONING="GridLayout">
16

<form id="Form1" method="post" runat="server">
17

18

<!-- zoom label used to display current zoom value ->
20

<DIV id="ZoomValue" style="DISPLAY: inline; Z-INDEX: 124; LEFT: 120px; WIDTH: 872px; POSITION: absolute; TOP: 88px; HEIGHT: 19px"
21

ms_positioning="FlowLayout"><STRONG><FONT face="Arial" size="2">Zoom:</FONT></STRONG></DIV>
22

<mapinfowebuiwebcontrols:mapcontrol id="MapControl1" style="Z-INDEX: 101; LEFT: 88px; POSITION: absolute; TOP: 128px"
23

runat="server" MapAlias="Map1" Height="600px" Width="600px"></mapinfowebuiwebcontrols:mapcontrol><mapinfowebuiwebcontrols:southnavigationtool id="SouthNavigationTool2" style="Z-INDEX: 102; LEFT: 640px; POSITION: absolute; TOP: 944px"
24

runat="server" MapControlID="MapControl1"></mapinfowebuiwebcontrols:southnavigationtool><mapinfowebuiwebcontrols:northnavigationtool id="NorthNavigationTool2" style="Z-INDEX: 104; LEFT: 224px; POSITION: absolute; TOP: 112px"
25

runat="server" MapControlID="MapControl1"></mapinfowebuiwebcontrols:northnavigationtool><mapinfowebuiwebcontrols:eastnavigationtool id="EastNavigationTool2" style="Z-INDEX: 105; LEFT: 912px; POSITION: absolute; TOP: 552px"
26

runat="server" MapControlID="MapControl1"></mapinfowebuiwebcontrols:eastnavigationtool><mapinfowebuiwebcontrols:westnavigationtool id="WestNavigationTool2" style="Z-INDEX: 106; LEFT: 72px; POSITION: absolute; TOP: 280px"
27

runat="server" MapControlID="MapControl1"></mapinfowebuiwebcontrols:westnavigationtool><mapinfowebuiwebcontrols:northeastnavigationtool id="NorthEastNavigationTool1" style="Z-INDEX: 108; LEFT: 840px; POSITION: absolute; TOP: 112px"
28

runat="server" MapControlID="MapControl1"></mapinfowebuiwebcontrols:northeastnavigationtool><mapinfowebuiwebcontrols:southwestnavigationtool id="SouthWestNavigationTool1" style="Z-INDEX: 109; LEFT: 64px; POSITION: absolute; TOP: 616px"
29

runat="server" MapControlID="MapControl1"></mapinfowebuiwebcontrols:southwestnavigationtool><mapinfowebuiwebcontrols:southeastnavigationtool id="SouthEastNavigationTool1" style="Z-INDEX: 110; LEFT: 952px; POSITION: absolute; TOP: 848px"
30

runat="server" MapControlID="MapControl1"></mapinfowebuiwebcontrols:southeastnavigationtool><mapinfowebuiwebcontrols:northwestnavigationtool id="NorthWestNavigationTool1" style="Z-INDEX: 111; LEFT: 72px; POSITION: absolute; TOP: 112px"
31

runat="server" MapControlID="MapControl1"></mapinfowebuiwebcontrols:northwestnavigationtool><mapinfowebuiwebcontrols:zoombartool id="ZoomBarTool1" style="Z-INDEX: 112; LEFT: 24px; POSITION: absolute; TOP: 216px"
32

runat="server" Height="8px" MapControlID="MapControl1" ZoomLevel="12500"></mapinfowebuiwebcontrols:zoombartool><mapinfowebuiwebcontrols:zoombartool id="ZoomBarTool2" style="Z-INDEX: 113; LEFT: 24px; POSITION: absolute; TOP: 240px"
33

runat="server" Height="8px" MapControlID="MapControl1" ZoomLevel="6500"></mapinfowebuiwebcontrols:zoombartool><mapinfowebuiwebcontrols:zoombartool id="ZoomBarTool3" style="Z-INDEX: 114; LEFT: 24px; POSITION: absolute; TOP: 264px"
34

runat="server" Height="8px" MapControlID="MapControl1" ZoomLevel="3550"></mapinfowebuiwebcontrols:zoombartool><mapinfowebuiwebcontrols:zoombartool id="ZoomBarTool4" style="Z-INDEX: 115; LEFT: 24px; POSITION: absolute; TOP: 288px"
35

runat="server" MapControlID="MapControl1" ZoomLevel="1500"></mapinfowebuiwebcontrols:zoombartool><mapinfowebuiwebcontrols:zoombartool id="ZoomBarTool5" style="Z-INDEX: 116; LEFT: 24px; POSITION: absolute; TOP: 312px"
36

runat="server" MapControlID="MapControl1" ZoomLevel="500"></mapinfowebuiwebcontrols:zoombartool><asp:image id="Image1" style="Z-INDEX: 117; LEFT: 32px; POSITION: absolute; TOP: 336px" runat="server"
37

ImageUrl="/MapXTremeWebResources 6_5/ZoomInToolControlActive.gif"></asp:image><asp:image id="Image2" style="Z-INDEX: 118; LEFT: 32px; POSITION: absolute; TOP: 192px" runat="server"
38

ImageUrl="/MapXTremeWebResources 6_5/ZoomOutToolControlActive.gif"></asp:image>
39

<div id="Info" style="Z-INDEX: 119; LEFT: 712px; VISIBILITY: hidden; POSITION: absolute; TOP: 16px">Div element
40

to display selected feature information in html table.</div>
41

<mapinfowebuiwebcontrols:pantool id="PanTool1" style="Z-INDEX: 120; LEFT: 984px; POSITION: absolute; TOP: 464px"
42

runat="server" MapControlID="MapControl1" ClientCommand="MapCommand"></mapinfowebuiwebcontrols:pantool><mapinfowebuiwebcontrols:zoomintool id="ZoomInTool1" style="Z-INDEX: 121; LEFT: 904px; POSITION: absolute; TOP: 464px"
43

runat="server" MapControlID="MapControl1"></mapinfowebuiwebcontrols:zoomintool><mapinfowebuiwebcontrols:zoomouttool id="ZoomOutTool1" style="Z-INDEX: 122; LEFT: 944px; POSITION: absolute; TOP: 464px"
44

runat="server" MapControlID="MapControl1"></mapinfowebuiwebcontrols:zoomouttool><mapinfowebuiwebcontrols:centertool id="CenterTool1" style="Z-INDEX: 123; LEFT: 1024px; POSITION: absolute; TOP: 464px"
45

runat="server" MapControlID="MapControl1"></mapinfowebuiwebcontrols:centertool><mapinfowebuiwebcontrols:pointselectiontool id="InfoWebTool1" style="Z-INDEX: 125; LEFT: 1072px; POSITION: absolute; TOP: 464px"
46

runat="server" MapControlID="MapControl1" ClientInteraction="ClickInteraction" ActiveImageUrl="/MapXtremeWebResources 6_5/InfoToolControlActive.gif" InactiveImageUrl="/MapXtremeWebResources 6_5/InfoToolControlInActive.gif"
47

CursorImageUrl="/MapXtremeWebResources 6_5/MapInfoWebInfo.cur" Command="Info" ClientCommand="InfoCommand"></mapinfowebuiwebcontrols:pointselectiontool><asp:label id="Label1" style="Z-INDEX: 107; LEFT: 72px; POSITION: absolute; TOP: 16px" runat="server"
48

Height="48px" Width="712px" Font-Size="X-Large" ForeColor="Navy" BorderColor="MediumTurquoise">InfoTool Web Sample </asp:label><asp:textbox id="TextBox1" style="Z-INDEX: 103; LEFT: 64px; POSITION: absolute; TOP: 64px" runat="server"
49

Height="8px" Width="806px" BackColor="DarkBlue"></asp:textbox><mapinfowebuiwebcontrols:rectangleselectiontool id="RectangleSelectionTool1" style="Z-INDEX: 126; LEFT: 1104px; POSITION: absolute; TOP: 464px"
50

runat="server" MapControlID="MapControl1" Command="RectangleSelection" ClientCommand="MapCommand" Active="True"></mapinfowebuiwebcontrols:rectangleselectiontool>
51

<div id="myCanvas" style="LEFT:896px;WIDTH:230px;POSITION:absolute;TOP:120px;HEIGHT:230px"><IMG src="file:///C:\Program Files\MapInfo\MapXtreme\6.5\Samples\Web\Features\InfoToolWeb\cs\eyemap.GIF"
52

height="230" width="230"></div>
53

<INPUT style="Z-INDEX: 128; LEFT: 896px; POSITION: absolute; TOP: 416px" type="button"
55

value="Button" onclick="myDrawFunction()">
56

//first time when page loads, at this point, maybe the image is already loaded, so
58

//alway call getZoomValue when the page loads first time.
59

getZoomValue();
60

//hook up map image onload event with getZoomValue method.
62

var mapimage = document.getElementById("MapControl1_Image");
63

mapimage.onload = getZoomValue;
64

</script>
65

</form>
66

</body>
67

</HTML>
68

Feedback

# re: MapInfo MapXtreme 2005 WebGIS上实现简单鹰眼设计！回复 更多评论

2006-10-17 14:33 by 李珍宝

借鉴你的思路。

# re: MapInfo MapXtreme 2005 WebGIS上实现简单鹰眼设计！回复 更多评论

2006-10-19 11:58 by DELL网站

好文，学习中...

# re: MapInfo MapXtreme 2005 WebGIS上实现简单鹰眼设计！回复 更多评论

2007-03-29 10:53 by Aaron.Lee

# re: MapInfo MapXtreme 2005 WebGIS上实现简单鹰眼设计！回复 更多评论

2007-04-27 15:45 by ff

太保守了把~~·

<script src="drawfunction.js" type="text/javascript"></script>
这个是最核心的代码，但是没有贴出来啊

# re: MapInfo MapXtreme 2005 WebGIS上实现简单鹰眼设计！回复 更多评论

2007-07-15 21:48 by ss

这是自带的范例吧

# re: MapInfo MapXtreme 2005 WebGIS上实现简单鹰眼设计！回复 更多评论

2007-10-30 16:19 by 辅导

没有什么好说的了

# re: MapInfo MapXtreme 2005 WebGIS上实现简单鹰眼设计！回复 更多评论

2008-07-27 18:43 by sweet

var mapimage = document.getElementById("MapControl1_Image");
mapimage.onload = getZoomValue;
onload事件 pan（平移工具）并不捕获，当使用pan 工具时，没响应
望解决

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