topic Re: Zoom to Point... in ArcGIS JavaScript Maps SDK Questions

Zoom to Point...

GISAdmin1 — Wed, 09 Nov 2011 16:50:00 GMT

Is this still the method to zoom to a point using the ESRI Javascript API?

 var PointExtent = new esri.geometry.Extent();
 PointExtent.xmin = selectedAddress.geometry.x - .001;
 PointExtent.ymin = selectedAddress.geometry.y - .001;
 PointExtent.xmax = selectedAddress.geometry.x + .001;
 PointExtent.ymax = selectedAddress.geometry.y + .001;
 map.setExtent(PointExtent);

Or, is there a new method?

Thanks in advance,

M

Re: Zoom to Point...

JeffPace — Fri, 10 Dec 2021 21:51:32 GMT

Is this still the method to zoom to a point using the ESRI Javascript API?

 var PointExtent = new esri.geometry.Extent();
 PointExtent.xmin = selectedAddress.geometry.x - .001;
 PointExtent.ymin = selectedAddress.geometry.y - .001;
 PointExtent.xmax = selectedAddress.geometry.x + .001;
 PointExtent.ymax = selectedAddress.geometry.y + .001;
 map.setExtent(PointExtent);

Or, is there a new method?

Thanks in advance,

M

Since its a point, I prefer

map.centerAndZoom(selectedAddress.geometry,19); // 19 or whatever zoom scale you prefer.

Re: Zoom to Point...

Mete_ErcanPakdil1 — Sat, 12 Nov 2011 21:33:53 GMT

Since its a point, I prefer

map.centerAndZoom(selectedAddress.geometry,19); // 19 or whatever zoom scale you prefer.

Jeff, I don't agree with you since it zooms more than current every time when it is called by user.

Re: Zoom to Point...

JeffPace — Mon, 14 Nov 2011 11:41:32 GMT

Jeff, I don't agree with you since it zooms more than current every time when it is called by user.

Well since by default a point does not have an extent, you have to assume one. If you want to stay at the current, you are not zooming, you are panning, in which case just call map.centerAt(pt).

Re: Zoom to Point...

derekswingley1 — Fri, 10 Dec 2021 21:51:35 GMT

Another option is to calculate a new extent from the map's current extent and use that to zoom. It's similar to the original code that was posted in this thread but instead of using a hard coded value, the value used to pad the point is calculated on the fly. Something like this:

var tolerance = 5,
    pxWidth = map.extent.getWidth() / map.width,
    padding = tolerance * pxWidth,
    newExtent = new esri.geometry.Extent({
      'xmin': evt.mapPoint.x - padding,
      'ymin': evt.mapPoint.y - padding,
      'xmax': evt.mapPoint.x + padding,
      'ymax': evt.mapPoint.y + padding,
      'spatialReference': evt.mapPoint.spatialReference
    });
map.setExtent(newExtent);