Latest Contributions by ShenglinXu

‎06-24-2011

I have tested the following code, works fine. Basically, I added a polygon drawing points to a point collection and draw them again. If I use a UI element, a textbox for example, the polygon will shift to right to some extent. However, I found this works great. var ps = e.GetPosition(null); Point aPnt = this.TransformToVisual(Map).Transform(ps); ESRI.ArcGIS.Client.Geometry.MapPoint mapPoint = Map.ScreenToMap(aPnt); _measurPntCol.Add(mapPoint);

‎12-08-2010

I have used my own code to get the snap point and draw a blue circle onMousrMove. Seems works fine but not as that good as ESRI's one. For example, ESRI's little blue marker is transparent and the selected feature does not flashing.

‎09-22-2010

I have implemented IEngineEditSketch in a custom tool. In the OnMouseDown event handler, I can add a point to the edit sketch: engineEditSketch.AddPoint(pPoint,true); However, I don???t know how to invoke ESRI???s code to draw that blue circle in OnMouseMove event handler. Is it possible? In another word, it is possible to invoke ESRI snap function in a custom tool programmatically? The key point is how to find out a snap point?

‎06-07-2010

I found ConstructUnion method some time returning an empty geometry even all the geometries added are not empty. Could you help to find out why? Is it a known issue? // Sample code IGeometry pGeomBag = null; IGeometryCollection geometryCollection = null; pGeomBag = new GeometryBagClass(); pGeomBag.SpatialReference = objFeature.ShapeCopy.SpatialReference; geometryCollection = (IGeometryCollection)pGeomBag; //buffer each selected roads and add to geometryCollection geometryCollection.AddGeometry(objBufferResult, ref missing, ref missing); //Do construct union IPolygon polygon = new PolygonClass(); ITopologicalOperator2 objTopo = polygon as ITopologicalOperator2; if (objTopo != null) { objTopo.ConstructUnion((IEnumGeometry)pGeomBag); objTopo.IsKnownSimple_2 = false; objTopo.Simplify(); IGeometry objExclusion = new PolygonClass(); objExclusion = (IGeometry)objTopo; }

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Date Last Visited	‎02-17-2022 09:03 AM

My Ideas

Latest Contributions by ShenglinXu

Re: ScreenToMap() retuning wrong values

Re: Invoke snapping in IEngineEditSketch

Invoke snapping in IEngineEditSketch

ConstructUnion method some time returning an empty geometry