C# – How to Draw a Rectangle on a Map Using ArcObjects

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I have two points, Ipoint upperRight; and Ipoint lowerLeft; points.

from the previous points i can get the height and the width for the rectangle.

How can i draw a rectangle on the map?.

I think i should use IGraphicsContainer.AddElement Method, but i don't know how, i searched through the internet but didn't find any useful example.

Best Answer

This is the code to draw a rectangle to page layout view.

IEnvelope env = element.Geometry.Envelope;

if (env != null) {
IPageLayout pLayout = activeView as IPageLayout;
IGraphicsContainer graphicsContainer = pageLayout as IGraphicsContainer;
graphicsContainer.Reset();
IRectangleElement rectangleElement = new RectangleElementClass();
IElement elem = rectangleElement as IElement;
elem.Geometry = env;
graphicsContainer .AddElement(elem, 0);
activeView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
}

Related Solutions

[GIS] How to loop through an array of point features

Okay, based on the additional information in the comments, I am proposing another way to go about reaching the actual goal which is identifying the coincident points in a point feature class. I will now perform this feat with zero programming (cue Europe's "The Final Countdown").

In ArcMap, add the point feature class in question as a layer.
Use Find Identical (Data Management) on the feature layer containing the coincident points. Select the SHAPE field since we are only interested in comparing the geometry. Enter appropriate XY and Z tolerances or accept the defaults. This will produce a standalone table containing a record for each feature in the input feature class, with columns for each feature's original ObjectID (IN_FID), and a sequential value (FEAT_SEQ) that will be the same for all features that were determined to be identical.
Use Frequency (Analysis) on the resulting Find Identical table. Select the FEAT_SEQ field as the frequency field. This will create another standalone table with the a field containing the count of the number of times each sequential value occured.
Join the Find Identical table to the point feature layer on the OBJECTID field in the points layer and FID field in the table.
Join the Frequency table to the point feature layer on the FEAT_SEQ field in the joined Find Identical table, and the FEAT_SEQ field in the Frequency table.
Select by Attributes on the point feature layer all those records where FREQUENCY > 1. Congratulations, you have now identified all the coincident points! Now do something with them.

Tips: You might use the in-memory workspace ("in_memory\someData") for the two stand-alone tables since they are only needed temporarily and the number of features is small. You could also script this easily with Python!

[GIS] How two add line from point A to B

The CreateLineString method only takes one argument - an array of Coordinate (strictly speaking an IEnumerable<ICoordinate> or an ICoordinateSequence). You can see this in the examples:

//Add a LineString with 2 Points
GeoAPI.Geometries.Coordinate[] points = new GeoAPI.Geometries.Coordinate 
    {
        new GeoAPI.Geometries.Coordinate(10, 10), 
        new GeoAPI.Geometries.Coordinate(20, 20), 
    };

geomColl.Add(gf.CreateLineString(points));

Note that there are some API differences across versions, so next time, posting exact version information might be useful.

Best Answer

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[GIS] How to loop through an array of point features

[GIS] How two add line from point A to B

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