Associated with my previous post I have a list of target points that I need to get the distance to. In all cases I have a single origin and multiple targets. I am getting the distance by creating a distance and backlink array and calling CostDistanceWithPolylineThe problem is that with each successive call all I get is the polyline from the origin to the first target. Why????My code:
for (int index = 0; index < targets.Count; index++)
{
IFeatureClass targetClass = (IFeatureClass) targets[index].Class;
IPoint targetPoint = (IPoint) targets[index].ShapeCopy;
if (!GPUtilities.CheckCoincidence(targetPoint, holdLayer, messages))
{
messages.AddMessage("Target is not coincident with the waterways and will be relocated.");
IFeature targetFeature = targets[index];
if (!RelocateToWaterway(ref targetFeature, rasterDataset, messages))
{
CreatePlaceholder(outputCursor, outputClass, messages);
continue;
}
targets[index] = targetFeature;
targetClass = (IFeatureClass)targetFeature.Class;
targetPoint = (IPoint) targetClass;
}
messages.AddMessage("Target is coincident with the hydrography map.");
IGeoDataset[] costSets = ComputeFullRaster(
targetClass, (RasterDataset) rasterDataset, messages);
// ** Temporary code for adding cost array to the map TOC
IApplication baseApp = (IApplication)Activator.CreateInstance(Type.GetTypeFromProgID("esriFramework.AppRef"));
IMxDocument doc = (IMxDocument) (baseApp.Document);
IMap activeMap = doc.ActiveView.FocusMap;
RasterLayer layer = new RasterLayerClass();
IRaster ds = (IRaster) costSets[0];
layer.CreateFromRaster(ds);
layer.Name = "Cost Array";
layer.Visible = true;
activeMap.AddLayer(layer);
IPointCollection points = new MultipointClass();
points.AddPoint(origin);
points.AddPoint(targetPoint);
messages.AddMessage(string.Format("Computing distance from origin to target {0}", index + 1));
IGeometryCollection result = distanceComputer.CostPathAsPolyline(points, costSets[0], costSets[1]);
if (result == null)
{
messages.AddMessage("No result was returned for this target.");
CreatePlaceholder(outputCursor, outputClass, messages);
continue;
}
for (int subindex = 0; subindex < result.GeometryCount; subindex++)
{
Polyline data = (Polyline) result.Geometry[subindex];
IPolyline idata = (IPolyline) data;
messages.AddMessage(string.Format("Their are {0} points on geometry {1} with length of {2}", data.PointCount, subindex, idata.Length));
messages.AddMessage("Saving geometry as new feature.");
IFeatureBuffer featureBuffer = outputClass.CreateFeatureBuffer();
IFeatureCursor cursor = outputClass.Insert(true);
featureBuffer.Shape = result.Geometry[subindex];
cursor.InsertFeature(featureBuffer);
cursor.Flush();
Marshal.FinalReleaseComObject(cursor);
}
}
