topic coincident points - extent in ArcGIS JavaScript Maps SDK Questions

coincident points - extent

PeggyCorey — Tue, 10 Mar 2015 14:15:54 GMT

I need to check for coincident points being returned from a FindTask, in order to zoom to the proper extent. I am currently zooming using a centerAndZoom for single points, and using a setExtent for lines, polygons and multiple points. But this will not work properly if the results set is a pair of coincident points, for example. Below is a sample of my current zoom code, but I need a solution for this coincident point scenario.

Anyone solved this kind of problem?

Thanks!

if (graphictype == "point" && map.graphics.graphics.length == 1) {

map.centerAndZoom(map.graphics.graphics[0].geometry,20);

}

else {

var extent = esri.graphicsExtent(map.graphics.graphics);

map.setExtent(extent.expand(2), true);

}

Re: coincident points - extent

RobertScheitlin__GISP — Tue, 10 Mar 2015 14:41:06 GMT

Peggy,

So does the coincident points produce an extent using graphicsExtent? if they do then you can check the width of the extent and if it does not return a predetermined size then fallback to using centerAndZoom. If the coincident points do not produce an extent using graphicsExtent then same thing fallback to centerAndZoom.

Re: coincident points - extent

PeggyCorey — Tue, 10 Mar 2015 15:02:29 GMT

Thanks for the suggestions Robert.

No, the coincident points do not produce and extent using graphicsExtent.

I know how to use centerAndZoom to zoom to 1 graphic. But how do I use it to zoom to multiples?

How do I check for coincidence?

Thanks!

Re: coincident points - extent

RobertScheitlin__GISP — Sun, 12 Dec 2021 02:19:42 GMT

Peggy,

Try something like this:

if (graphictype == "point" && map.graphics.graphics.length == 1) {
  map.centerAndZoom(map.graphics.graphics[0].geometry,20);
} else if (graphictype == "point" && map.graphics.graphics.length > 1 && !esri.graphicsExtent(map.graphics.graphics)){
  map.centerAndZoom(map.graphics.graphics[0].geometry,20);
} else {
  var extent = esri.graphicsExtent(map.graphics.graphics);
  map.setExtent(extent.expand(2), true);
}

Re: coincident points - extent

PeggyCorey — Tue, 10 Mar 2015 17:10:08 GMT

Robert,

Thanks... that worked perfectly!