topic Re: Label Polygon Vertices in ArcGIS JavaScript Maps SDK Questions

Label Polygon Vertices

JamesCrandall — Sat, 11 Dec 2021 19:36:32 GMT

Can anyone point me to an example/sample of labeling polygon geometry at each vertex?

I have a requirement to label each vertex with coordinate info.

Javascript 3.x

Update: I've attempted to implement the Points for Labeling method on the Geometry service, as seen in this example but I'm getting an error

init.js:114 TypeError: Cannot read property '0' of undefined
at Object.labelPoints (init.js:2548)

getLabelPoints: function (geom) {
            var geometryService = new GeometryService("https://utility.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");
            var geographicGeometries = [];
            geographicGeometries.push(esri.geometry.webMercatorToGeographic(geom));

            if (geom.rings.length > 0) {
                geometryService.labelPoints(this.geom, function(labelPoints) { 
                    var font = new Font("20px", Font.STYLE_NORMAL, Font.VARIANT_NORMAL, Font.WEIGHT_BOLDER);
                    array.forEach(this.labelPoints, function (labelPoint) {
                        // create a text symbol
                        var textSymbol = new TextSymbol(
                          "X: " + number.format(labelPoint.x) + ", Y: " + number.format(this.labelPoint.y),
                          font, new Color([0, 0, 0]));

                        var labelPointGraphic = new Graphic(this.labelPoint, textSymbol);

                        // add the label point graphic to the map
                        map.graphics.add(labelPointGraphic);
                    });
                });
            }
           },‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Label Polygon Vertices

RobertScheitlin__GISP — Fri, 20 Apr 2018 19:41:09 GMT

James,

The only way I can think of is to create a GraphicsLayer that uses a text symbol and loop through the polygons ring array to get the points and use those points as the geometry for the graphic.

Re: Label Polygon Vertices

JamesCrandall — Fri, 20 Apr 2018 19:59:00 GMT

That makes sense. This should be fun and infuriating... I can tell already.

Thanks again!

Re: Label Polygon Vertices

JamesCrandall — Mon, 23 Apr 2018 15:08:36 GMT

I won't be able to implement this until finished up another requirement. Seems like your answer will be the way to go and I'll go ahead and mark as the answer.