Latest Contributions by CarstenSchumann

Hey around, I have a two featureClasses of type Polygon where the slave-class depends on the master-class. Having said this I want to reshape some portions of the slave-class (I call them Candidates within my code) by the appropriate paths within the master-class. So I start up querying the slaves that belong to a given master-features by using a spatial query (intersect). Now I loop every point within the slave and compare them to the points within the master. I assume the following condition for my candidate: The from-point and the to-point of the Candidate coincide the master-geometry. So I calculate the distance of the points within the slave-geometry to the master-geometry using the IProximityOperator-interface (with master-geom as proxy). A distance of 0 indicates that the point is on the master-geometry. So I build up the candidates as ICurve-members by adding all the points that do NOT coincide the master-geometry and finally append the from- and to-point (which DO coincide). Now I have a set of candidates that represent ICurve-members. The following code retrieves the candidates: IPointCollection4 points = (IPointCollection4)slave.Feature.Shape; // the points of the slave-feature IPoint fromPoint = null;     // fromPoint of the candidate IPoint toPoint = null;     // toPoint of the candidate IPolyline curve = new PolylineClass();   // the geometry of the candidate to add to the result-list IPointCollection curvePoints = (IPointCollection)curve; for (int j = 19; j < 22; j++)    // consider only these three points { // iterate through the points of the slave-geometry IPoint point = points.get_Point(j); double distance = proxy.ReturnDistance(point); // distance from every point within the slave to the master-geometry if (distance > TestClass.Tolerance) // point is totally outside {       // does not happen in our test-case   // ... } else if (distance < TestClass.Tolerance && distance > 0) // point is within the tolerance so it might be a candidate {    curvePoints.AddPoint(point); } else {   // point touches the outline of the feature. These touching points form the borders of the correction   if (fromPoint == null) fromPoint = point; // set the fromPoint if not exists   toPoint = point;    // set the toPoint   // terminate the candidate and append it to the result   IRelationalOperator relOp = (IRelationalOperator)fromPoint;   if (!relOp.Equals(toPoint))   {    // terminate the current curve    // add the fromPoint to the curve    object before = (object)0;    object after = Type.Missing;    curvePoints.AddPoint(fromPoint, ref before, ref after);    // add the toPoint to the curve    curvePoints.AddPoint(toPoint);    fromPoint = point;  // make the current toPoint the next fromPoint    toPoint = null;           Candidate candidate = new Candidate(curve);// build a new (temporary) candidate from the curve    result.Add(candidate);   } } } What I do next is getting the actual reshaper-geometry from the master-feature. Therefor I extract the portion of the master-geometry that fits from- and to-point of my candidate using this code: IPoint fromPoint = this.Geometry.FromPoint; // "this" is the candidate we retrieved in the previos code IPoint toPoint = this.Geometry.ToPoint; double fromDistance = 0, toDistance = 0;   // distances along the curve // if these variables are not equal 0 the given point does not belong to the curve double fromAcrossDistance = 0, toAcrossDistance = 0; // distances across the curve // get the ring that forms the masterGeometry in order to access the methods for querying near points IRing ring = new RingClass(); ((ISegmentCollection) ring).AddSegmentCollection((ISegmentCollection) masterGeometry); // calculate the distance of the fromPoint to the master-geometries along its curve ring.QueryPointAndDistance(esriSegmentExtension.esriNoExtension, fromPoint, false, null, ref fromDistance, ref fromAcrossDistance, false); // calculate the distance of the toPoint to the master-geometries along its curve ring.QueryPointAndDistance(esriSegmentExtension.esriNoExtension, toPoint, false, null, ref toDistance, ref toAcrossDistance, false); // when either the from- or the toPoint does not coincide with the geometry we return an empty curve    // obviously here is the problem // although we got the from- and toPoints of the candidate (this) by checking if their distance to the masterGeometry is 0 we get some (quite small) // difference to 0 in the distances accross the curve if (fromAcrossDistance > 0 || toAcrossDistance > 0) return (ICurve) new Path(); What is strange in here is that for the same candidate (whose from- and to-point are on the master-geometry, compare condition) we get from/toAcrossDistances that are not exactly 0 but sth. around 0.0000009 or so. why do IRing#QueryPointAndDistance and IProximityOperator#ReturnDistance behave so different and how can I avoid this? I hope that you can follow my thoughts and help me finding out the issue behind. I append two shape-files with the mentioned features also. Bye ... View more

Hey there, after being glad to have solved my last problem I just come up with a new one which I can´t figure out. When reshaping a polygon I use Ring#Reshape(IPath), which gives me a boolean if all worked fine. Unfortunelty it won´t give me any return-value but an exception which is -2147220936. I just looked the codes and found NETWORK_E_EDIT_SESSION_IN_PROGRESS but as the last problem wasn´t related with any Network-features (since I do not use them at all) I´ll bet this error has also nothing to do with this confusing message. So I googled for the error-code and found out that the actual error-message to this code is "The coordinates or measures are out of bounds." (which I cannot conform again as I do not receive any error-message). But as the concerned feature is located in the centre of my featureClass I cannot imagine this is really the clue. So which error is right and what exactly does it have to do with my problem of reshaping an IRing? ... View more