topic Re: polygon.contains and polygon.getExtent()? in ArcGIS JavaScript Maps SDK Questions

polygon.contains and polygon.getExtent()?

ShaningYu — Fri, 09 Mar 2018 19:47:14 GMT

I created a polygon from ar2D.

var polygon_ = new esri.geometry.Polygon({

"rings": ar2D,

"spatialReference": {

"wkid": 102100

}

});

var extent = polygon_.getExtent();

console.log("polygonExtent", extent);

var bContains = polygon_.contains(new esri.geometry.Point( ar2D[0] ));

------------------

However, the Results show:

the values of extent.xmax,extent.xmin,extent.ymax,extent.ymin are NaN

bContains = false

Unknwon why? Thanks if you can help.

Re: polygon.contains and polygon.getExtent()?

RobertScheitlin__GISP — Fri, 09 Mar 2018 21:57:00 GMT

Shaning,

Do your points in your array have a spatial reference assigned?

Re: polygon.contains and polygon.getExtent()?

DanPatterson_Retired — Fri, 09 Mar 2018 22:10:44 GMT

Vince Angelo‌ asked a similar question about one of Shaning's other posts with no response yet

https://community.esri.com/thread/211013-polygoncontans-point-returns-false

Re: polygon.contains and polygon.getExtent()?

JohnGrayson — Fri, 09 Mar 2018 22:30:22 GMT

If ar2D[0] represents a point, then it wouldn't make sense to use ar2D as the 'rings' of a polygon. Considering that the extent coordinates are NaN, my guess is that ar2D needs to be wrapped up in an array like so:

var polygon_ = new esri.geometry.Polygon({

"rings": [ar2D],

"spatialReference": {

"wkid": 102100

}

});

...but just guessing as we have no idea what ar2D is...

Re: polygon.contains and polygon.getExtent()?

ShaningYu — Mon, 12 Mar 2018 13:03:00 GMT

Revised the code as

var ar2D = new Array();

for (var j = 0; j < p_.length; j++) {

var ar1D = [p_[0], p_[1]];

ar2D.push(ar1D);

} var polygon = new esri.geometry.Polygon(new esri.SpatialReference( { wkid: 102100 } ) );

polygon.addRing( ar2D );

var pt = new esri.geometry.Point(ar2D[0], new esri.SpatialReference({ wkid: 102100 }));

Then polygon.contains(pt) returns true.

Thanks to Robert, Dan and John.

Re: polygon.contains and polygon.getExtent()?

RobertScheitlin__GISP — Wed, 14 Mar 2018 13:57:38 GMT

Shaning,

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