since i can't find way to edit the vertex using built-in function, i decided
to allow user to draw multiple polygons. the selected polygons can later be
used to be combined, or clear polygons that it overlaps with.
here's the sample code:
<html>
<head>
</head>
<body class="AppFrame" onLoad="InitDocument()">
<%
bool mapUpdated = false;
string returnStat = "";
string mgSessionId = GetParameters()["SESSION"];
Uri MyUrl = Request.Url;
Response.Write("URL: " + MyUrl.AbsoluteUri+ "<br><br>");
try
{
string selXml = GetParameters()["selXml"];
string selCmd = GetParameters()["command"];
Response.Write(selCmd + "<br>");
Response.Write(selXml);
if(selCmd=="remove")
ClearPolygon(selXml, mgSessionId);
if(selCmd=="combine")
returnStat = CombinePolygon(selXml,
mgSessionId);
if(selCmd=="removeall")
ClearPolygon(mgSessionId);
if(selCmd=="combineall")
returnStat = CombinePolygon(mgSessionId);
if(returnStat=="")
mapUpdated = true;
}
catch (MgException mge)
{
Response.Write(mge.GetExceptionMessage());
Response.Write(mge.GetDetails());
}
%>
</body>
</html>
<script language="c#" runat="server">
void ClearPolygon(string mgSessionId)
{
Clear("ID > 0", mgSessionId);
}
void ClearPolygon(string selectionXml, string mgSessionId)
{
MgUserInformation userInfo = new MgUserInformation(mgSessionId);
MgSiteConnection siteConnection = new MgSiteConnection();
siteConnection.Open(userInfo);
MgMap map = new MgMap(siteConnection);
map.Open(WORLD_MAP);
MgLayer polyLayer = GetLayerByName(map, "PolyMarker");
MgSelection selection = new MgSelection (map, selectionXml);
Clear(selection.GenerateFilter(polyLayer,"PolyMarker"), mgSessionId);
}
void Clear(string selectionFilter, string mgSessionId)
{
try
{
InitializeWebTier ();
MgUserInformation userInfo = new MgUserInformation(mgSessionId);
MgSiteConnection siteConnection = new MgSiteConnection();
siteConnection.Open(userInfo);
MgResourceService resourceService =
siteConnection.CreateService(MgServiceType.ResourceService) as
MgResourceService;
MgFeatureService featureService =
siteConnection.CreateService(MgServiceType.FeatureService) as
MgFeatureService;
MgResourceIdentifier FeatureSourceId = new
MgResourceIdentifier("Session:"
+ mgSessionId + "//PolyMarker.FeatureSource");
MgFeatureCommandCollection Commands = new
MgFeatureCommandCollection();
MgMap map = new MgMap(siteConnection);
map.Open(WORLD_MAP);
MgLayer polyLayer = GetLayerByName(map, "PolyMarker");
if (polyLayer != null)
{
Response.Write("<br/>" + selectionFilter);
Commands.Add(new MgDeleteFeatures("PolyMarker",
selectionFilter));
//featureService.UpdateFeatures(FeatureSourceId,
Commands, false);
ReleaseReader(featureService.UpdateFeatures(FeatureSourceId, Commands,
false), Commands);
polyLayer.SetVisible(true);
polyLayer.ForceRefresh();
map.Save(resourceService);
}
}
catch (MgException mge)
{
Response.Write(mge.GetExceptionMessage());
Response.Write(mge.GetDetails());
}
}
string CombinePolygon(string mgSessionId)
{
return Combine("ID > 0", mgSessionId);
}
string CombinePolygon(string selectionXml, string mgSessionId)
{
MgUserInformation userInfo = new MgUserInformation(mgSessionId);
MgSiteConnection siteConnection = new MgSiteConnection();
siteConnection.Open(userInfo);
MgMap map = new MgMap(siteConnection);
map.Open(WORLD_MAP);
MgLayer polyLayer = GetLayerByName(map, "PolyMarker");
MgSelection selection = new MgSelection (map, selectionXml);
return Combine(selection.GenerateFilter(polyLayer,"PolyMarker"),
mgSessionId);
}
string Combine(string selectionFilter,string mgSessionId)
{
bool flag = true;
DateTime startTime = DateTime.Now;
try
{
InitializeWebTier ();
MgUserInformation userInfo = new MgUserInformation(mgSessionId);
MgSiteConnection siteConnection = new MgSiteConnection();
siteConnection.Open(userInfo);
MgResourceService resourceService =
siteConnection.CreateService(MgServiceType.ResourceService) as
MgResourceService;
MgFeatureService featureService =
siteConnection.CreateService(MgServiceType.FeatureService) as
MgFeatureService;
MgResourceIdentifier FeatureSourceId = new
MgResourceIdentifier("Session:"
+ mgSessionId + "//PolyMarker.FeatureSource");
MgFeatureCommandCollection Commands = new
MgFeatureCommandCollection();
MgMap map = new MgMap(siteConnection);
map.Open(WORLD_MAP);
MgLayer polyLayer = GetLayerByName(map, "PolyMarker");
if (polyLayer != null)
{
Response.Write("<br/>" + selectionFilter);
MgFeatureQueryOptions selQuery = new
MgFeatureQueryOptions();
selQuery.SetFilter(selectionFilter);
MgFeatureReader featureReader =
polyLayer.SelectFeatures(selQuery);
MgGeometryCollection geometries = new
MgGeometryCollection();
MgAgfReaderWriter geometryReaderWriter = new
MgAgfReaderWriter();
MgGeometryFactory geometryFactory = new
MgGeometryFactory();
MgPolygon newPolygon;
while(featureReader.ReadNext())
{
MgByteReader temp =
featureReader.GetGeometry("GEOM");
MgGeometry tempGeo =
geometryReaderWriter.Read(temp);
geometries.Add(tempGeo);
}
for(int i=0; i<geometries.GetCount(); i++) //
check if geometries
intersects with each other
{
bool onceIntersect = false;
for(int j=0; j<geometries.GetCount(); j++)
{
if(i!=j)
if(geometries.GetItem(i).Intersects(geometries.GetItem(j)))
onceIntersect = true;
}
if(!onceIntersect)
{
flag = false;
return "Not all polygon intersects with
each other";
}
}
if(flag)
{
MgGeometry newGeometry = geometries.GetItem(0);
for(int i=1; i<geometries.GetCount(); i++)
// combine the geometries
{
newGeometry =
newGeometry.Union(geometries.GetItem(i));
}
MgByteReader geom =
geometryReaderWriter.Write(newGeometry);
MgPropertyCollection properties = new
MgPropertyCollection();
properties.Add(new MgGeometryProperty("GEOM",
geom));
properties.Add(new MgStringProperty("Text",
""));
Commands.Add(new MgDeleteFeatures("PolyMarker",
selectionFilter));
Commands.Add(new MgInsertFeatures("PolyMarker",
properties));
//featureService.UpdateFeatures(FeatureSourceId, Commands, false);
ReleaseReader(featureService.UpdateFeatures(FeatureSourceId, Commands,
false), Commands);
map.Save(resourceService);
polyLayer.SetVisible(true);
polyLayer.ForceRefresh();
}
}
}
catch (MgException mge)
{
Response.Write(mge.GetExceptionMessage());
Response.Write(mge.GetDetails());
}
return "";
}
--
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