Hi Mikhael, take a look at a question from few days ago here on the list, named "How to display polygon length dimensions". Javier Mamano replied with a link to one of his libs that displays the length of a line in the middle of it: http://jorix.github.io/OL-DynamicMeasure/examples/measure-dynamic.html Maybe you could take a look at his code =] Att. Cláudio
2013/8/1 Mikhaél Santos <[email protected]> > Hi guys,**** > > I wanted to know if it’s possible to dynamically set a linestrings label > to the center of the linestring. **** > > Currently I have something like this:**** > > labelDeltaPixels: function (feature) {**** > > var vert = feature.geometry.getVertices();**** > > var startPoint = vert[0],**** > > middlePoint;**** > > //If more than 1 point get a middle point**** > > //else calculate the middle coordenate**** > > if(vert.length > 2){**** > > middlePoint = vert[Math.floor(vert.length / 2)];**** > > }else {**** > > middlePoint = new OpenLayers.Geometry.Point((vert[0].x + > vert[1].x)/2, (vert[0].y + vert[1].y)/2)**** > > }**** > > //This is where I am having problems the values obtain from > pixelStart and PixelMiddle don’t coincide with the middle of the > linestring, it’s not close at all, the label continues at the start point. > **** > > var pixelStart = feature.layer.map.getPixelFromLonLat(new > OpenLayers.LonLat(startPoint.x.toFixed(5) , startPoint.y.toFixed(5) ));*** > * > > var pixelMiddle = feature.layer.map.getPixelFromLonLat(new > OpenLayers.LonLat(middlePoint.x.toFixed(5) , middlePoint.y.toFixed(5) ));* > *** > > var deltaX = pixelMiddle.x- pixelStart.x;**** > > var deltaY = pixelStart.y - pixelMiddle.y;**** > > return {**** > > x: deltaX,**** > > y: deltaY**** > > };**** > > }**** > > ** ** > > Any help is appreciated.**** > > Thanks**** > > _______________________________________________ > Users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/openlayers-users > >
_______________________________________________ Users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/openlayers-users
