topic Add multipoint to graphics container in ArcObjects SDK Questions

Add multipoint to graphics container

forestknutsen1 — Sat, 11 Dec 2021 13:55:39 GMT

How can I draw a multipoint with a graphic?

I am working on C#.NET ArcObjects add in for ArcGIS desktop 10.0/10.1. The bellow code works fine for adding a one of the points when I set the element.Geometry = points[0] in line 32. But I do not know the right pattern when add a group of points to a graphic container. I have looked around but could not find an example.

Thanks for any help!

            RgbColor color = new RgbColorClass();
            color.Blue = 255;
            color.Red = 0;
            color.Green = 0;
            RgbColor colorOutline = new RgbColorClass();
            ISimpleMarkerSymbol simpleMarkerSymbol = new SimpleMarkerSymbolClass();
            simpleMarkerSymbol.Color = color;
            simpleMarkerSymbol.Outline = true;
            simpleMarkerSymbol.OutlineColor = colorOutline;
            simpleMarkerSymbol.Size = 9;
            simpleMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSDiamond;
            IMarkerElement markerElement = new MarkerElementClass();
            markerElement.Symbol = simpleMarkerSymbol;
            List<IPoint> points = new List<IPoint>();
            int numberOfPoints = pipeOids.Count;
            for (int i = 0; i < numberOfPoints; i++)
            {
                IPoint point = new PointClass();
                point = MeasureToPoint(pipeOids, measures);
                points.Add(point);
            }
            
            Multipoint multipoint = new MultipointClass();
            foreach (IPoint point in points)
            {
                multipoint.AddPoint(point);
            }


            IElement element = null;
            element = (IElement) markerElement;
            element.Geometry = (IGeometry) multipoint;
            graphicsContainer.AddElement(element, 0);

Re: Add multipoint to graphics container

DanPatterson_Retired — Mon, 23 Nov 2015 00:18:16 GMT

Is part of your post missing? I just see the code?

Re: Add multipoint to graphics container

forestknutsen1 — Mon, 23 Nov 2015 01:04:39 GMT

Well there is a little bit of text at the start:

"How can I draw a multipoint with a graphic?"

The above code works fine for adding a one of the points when I set the element.Geometry = points[0] in line 32. But I do not know the right pattern when add a group of points to a graphic container. I have looked around but could not find an example. Sorry, I should have given a little more info upfront.

Re: Add multipoint to graphics container

forestknutsen1 — Sat, 11 Dec 2021 13:55:42 GMT

OK, so first off I have discovered that I should not be using a mulitpoint object, but just point objects. Which in my defense is what I was trying to do at first. When it did not work I thought maybe if I try some other object. So, I now think that the problem is coming from repeated calls to graphicsContainer.DeleteAllElements(); I am getting extra calls because the ShowResultPoints method is called by the selection changed event from a data grid three times when loading the data grid. By placing some boolean flags in the form class I have prevented it from running extra times on loading.

The below code is working for adding the points.

        internal static void ShowResultPoints(List<Int64> pipeOids, List<double> measures)
        {
            IGraphicsContainer graphicsContainer = null;
            IMap map = null;
            map = (IMap)ArcMap.Document.FocusMap;
            graphicsContainer = (IGraphicsContainer)map;
            RgbColor color = new RgbColorClass();
            color.Blue = 255;
            color.Red = 0;
            color.Green = 0;
            RgbColor colorOutline = new RgbColorClass();
            colorOutline.Red = 255;
            ISimpleMarkerSymbol simpleMarkerSymbol = new SimpleMarkerSymbolClass();
            simpleMarkerSymbol.Color = color;
            simpleMarkerSymbol.Outline = true;
            simpleMarkerSymbol.OutlineColor = colorOutline;
            simpleMarkerSymbol.Size = 9;
            simpleMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSDiamond;
            IMarkerElement markerElement = new MarkerElementClass();
            markerElement.Symbol = simpleMarkerSymbol;
            List<IPoint> points = new List<IPoint>();
            int numberOfPoints = pipeOids.Count;


            for (int i = 0; i < numberOfPoints; i++)
            {
                IPoint point = new PointClass();
                point = MeasureToPoint(pipeOids, measures);
                points.Add(point);
                IElement element = new MarkerElementClass();
                element = (IElement)markerElement;
                element.Geometry = point;
                graphicsContainer.AddElement(element, 0);
            }
            ArcMap.Document.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
        }