Zoom to selection

Question

I am trying to create an application, where in I want to zoom to selected features. Basically, I want to zoom to the extent of a selected point or polygon.

I am trying to do this in javascript. – shipi Mar 02 '12 at 18:55 — shipi, Mar 02 '12 at 18:55

Jagadesh · Answer 1 · 2013-03-12T13:37:28.840

6

Try this will work for you

function ZoomToSelection() {
      graphics = new esri.Graphic();
      var taxLotExtent;
  graphics = featureLayer.getSelectedFeatures();
      taxLotExtent = graphics[0].geometry.getExtent();
  map.setExtent(taxLotExtent);
  }

edited Mar 12 '13 at 13:37

answered Mar 12 '13 at 11:27

Jagadesh

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3
13

The above one is for single feature for multiple features use esri.geometry.Extent(pass the individual geometry extent by iterating). You will get the resultant Extent of the selected fetures. – Jagadesh Mar 12 '13 at 13:40
You can't just iterate since you will then zoom to each individual feature in succession. You need to merge all the extents then zoom to the resulting extent. – NenadK Feb 26 '16 at 01:03

score 2 · Answer 2 · edited Mar 02 '12 at 18:59

I suspect the java is not far from this (this is C#) but the principles are the same. Query the selection extents, union them, bump the result by a factor, and show it.

// passing in ActiveView 
// passing in targetLayer
// ZOOM_FACTOR = 1.5 
// ensure we have selected features
IFeatureSelection featureSelection = targetLayer as IFeatureSelection;
if (featureSelection == null) return;

ISelectionSet selectionSet = featureSelection.SelectionSet;

using (ComReleaser comReleaser = new ComReleaser())
{
    // search for each selection
    ICursor cursor;
    selectionSet.Search(null, true, out cursor);
    comReleaser.ManageLifetime(cursor);

    // build an envelope containing a union of the selections
    IFeatureCursor featureCursor = cursor as IFeatureCursor;
    IFeature feature;
    IEnvelope envelope = new EnvelopeClass();
    while ((feature = featureCursor.NextFeature()) != null)
    {
        IGeometry geometry = feature.Shape;
        IEnvelope featureExtent = geometry.Envelope;
        envelope.Union(featureExtent);
    }

    if (!envelope.IsEmpty)
    {
        // set the extent
        envelope.Expand(ZOOM_FACTOR, ZOOM_FACTOR, true);
        view.Extent = envelope;
        view.Refresh();
    }
}

Sam007 · Answer 3 · 2015-04-14T18:22:38.047

1

Why not use graphicUtils.graphicsExtent

Simply pass in the array of graphics and you will get the extent.

edited Apr 14 '15 at 18:22

answered Apr 13 '15 at 22:48

Sam007

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score 1 · Answer 4 · answered May 31 '12 at 22:29

You should be able to do this by calling getSelectedFeatures() on your Feature Layer (big assumption that this is a graphics or feature layer, am i correct here?) and then iterating through the returned array of Graphic objects. If the features are polygons, then the geometry property will have a getExtent() method. Just keep track of the extreme lat/lng values and set the map extent to these once you've checked all of the selected features. I'm a little confused by your mention of 'point and polygon' because I thought feature classes had to be one type or the other. Are you trying to zoom in on a group of features selected from two different sets? This would be a little trickier but should still be achievable by a similar method.

score 0 · Answer 5 · edited Jan 12 '21 at 09:12

0

To zoom at particular feature, you need a geometry of the feature.

var geometry = selectedFeature.geometry;
zoomToFeature: function (geometry) {
  this.map.setExtent(geometry.getExtent());
};

Esri documentation of extent

edited Jan 12 '21 at 09:12

Kadir Şahbaz

76,800
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answered Jan 12 '21 at 06:03

Kanhaya Tyagi

1

Zoom to selection

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