I'm trying to use CQL, but it doesn't work:
synbolizer.setGeometry(ECQL.toExpression("point(" + strXAttributeName + "," +
strYAttributeName + ")"));
The error is: encountered X when expecting ...
This doesn't work either:
synbolizer.setGeometry(ECQL.toExpression("geomFromWKT(point(" +
strXAttributeName + "," + strYAttributeName + "))"));
Ron
________________________________
From: Jody Garnett <[email protected]>
To: Ron Lindhoudt <[email protected]>
Cc: "[email protected]"
<[email protected]>
Sent: Wednesday, November 7, 2012 2:26 PM
Subject: Re: [Geotools-gt2-users] Construct Geometry from X, Y attribute (using
geomFromWKT?)
We have a range of functions that are able to create a geometry, including a
"point" function:
final Expression pointExpression = ff.function("point, ff.properaty("X"),
ff.property("Y") );
Point point = pointExpression.evaulate( feature, Point.class );
Or CQL: point( X, Y )
However my statement still stands, you can use a geometry factory, while
visiting a feature collection to create points.
final Expression xpath = ff.property("X");
final Expression ypath = ff.property("Y");
featureCollection.accepts( new FeatureVisitor(){
public void visit( Feature feature ){
Double x = xpath.evaualte( feature, Double.class );
Double y = ypath.evaualte( feature, Double.class );
Point pt = gf.createPoint( x,y );
}
}, null );
--
Jody Garnett
On Wednesday, 7 November 2012 at 5:28 PM, Ron Lindhoudt wrote:
Hi Jody,
>
>I mean dynamically, based on a column attribute in a table. Like in an
>ExternalGraphic where you can reference an attribute ${ATT_NAME}.png for the
>URL
>
>
>
>Ron
>
>
>
>
>________________________________
> From: Jody Garnett <[email protected]>
>To: Ron Lindhoudt <[email protected]>
>Cc: "[email protected]"
><[email protected]>
>Sent: Wednesday, November 7, 2012 2:46 AM
>Subject: Re: [Geotools-gt2-users] Construct Geometry from X, Y attribute
>(using geomFromWKT?)
>
>
>Use a GeometryFactory directly?
>
>
>The documentation has many examples of how t o create a point, including with
>WKT:
>
>
>- http://docs.geotools.org/latest/userguide/library/jts/geometry.html#creating-a-point
>
>
>--
>Jody Garnett
>
>
>
>On Tuesday, 6 November 2012 at 5:55 PM, Ron Lindhoudt wrote:
>Hello,
>>
>>
>>Is it possible to construct a Geometry from X, Y attribute in a table?
>>I tried some function expressions for setGeometry, but they don't work:
>>
>>
>>String strExpression = "geomFromWKT('Point(X Y)')";
>>// or
>>
>>String strExpression = "geomFromWKT('Point(${X} ${Y})')";
>>
>>
>>rule.getSymbolizers()[0].setGeometry(ECQL.toExpression(strExpression));
>>
>>
>>Thanks for any input.
>>
>>Ron
>>
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>
>
>
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