topic Re: Adding Polygon in ArcGIS JavaScript Maps SDK Questions

Adding Polygon

JulieBiju — Mon, 12 Oct 2015 05:28:25 GMT

Hi all, Thank U.

I am trying to add a polygon in a button click.The below code wrote in button click.But the polygon not showing. If I will pass some points direct like this then it is working perfect.Where is the problem??

polygon1.addRing([[58.4245719470205, 23.582511030118049], [58.423799470824214, 23.594545845196812],[58.44002147094627, 23.5743298721676], [58.443798021239232, 23.578735174416867], [58.4245719470205, 23.582511030118049]]);

while (CMt <= (list.d.length - 1))
{

                                    if (Points1 != "") {
                                        Points1 = Points1 + ",";
                                    }
                                    Points1 = Points1 + "[" + list.d[CMt].EPolyLong + "," + list.d[CMt].EPolyLat + "]";
                                    gname = list.d[CMt].EPolyGname;
                                    GDesc = list.d[CMt].EPolyGDesc;
                                    CMt = CMt + 1;
                                };
                                if( Points1 != "")
                                {
                                    AddPolygonGraphics(Points1, gname, GDesc);
                                    Points1 = "";
                                }

            function AddPolygonGraphics(Points1, gname, GDesc) {
                Points1 = "[" + Points1 + "]"
                var polygon1 = new Polygon(new SpatialReference({ wkid: 4326 }));
                 //polygon1.addRing([[58.4245719470205, 23.582511030118049], [58.423799470824214, 23.594545845196812],[58.44002147094627, 23.5743298721676], [58.443798021239232, 23.578735174416867], [58.4245719470205, 23.582511030118049]]);
                polygon1.addRing(Points1);
//                alert(polygon1.rings[0].length);
                // map is in web mercator so transform the geometry
                var poly_wm = webMercatorUtils.geographicToWebMercator(polygon1);
                var symbol = new SimpleFillSymbol();
                var strhotspot = (gname.trim());
                if (GDesc != "")
                {
                    strhotspot = strhotspot + "," + (GDesc.trim());
                }
                var infoTemplate = new InfoTemplate();
                infoTemplate.content = strhotspot;
                var graphic = new Graphic(poly_wm, symbol);
                graphic.setInfoTemplate(infoTemplate);
                MyGraphicsLayerGL.add(graphic);
                mapDiv.style.visibility = "visible";
                DivesriLogoImage.style.visibility = "hidden";

            }

Re: Adding Polygon

thejuskambi — Sat, 11 Dec 2021 09:31:29 GMT

The addRing Method in the Polygon takes either a Point[] or Number[][]. whereas, you are providing it with a string value. That might be the cause of the problem. Try below code

Points1= [];
while (CMt <= (list.d.length - 1)){
    ar newPoint = new Point(list.d[CMt].EPolyLong, list.d[CMt].EPolyLat ,new SpatialReference({ wkid: 4326 }));
    gname = list.d[CMt].EPolyGname;
    GDesc = list.d[CMt].EPolyGDesc;
    Points1.push(newPoint);
    CMt = CMt + 1;
};

Points1= [];
while (CMt <= (list.d.length - 1)){
    Point1.push([list.d[CMt].EPolyLong, list.d[CMt].EPolyLat]);
    gname = list.d[CMt].EPolyGname;
    GDesc = list.d[CMt].EPolyGDesc;
    CMt = CMt + 1;
};

Re: Adding Polygon

JulieBiju — Sat, 11 Dec 2021 09:31:32 GMT

Thank u. Here I tried in the below way. But when I add "[" character and when it reach to AddPolygonGraphics again the same wrong result

Can u help me?

Points1 = [];
while (CMt <= (list.d.length - 1))
{
Points1.push("["+[list.d[CMt].EPolyLong, list.d[CMt].EPolyLat]+"]");
     gname = list.d[CMt].EPolyGname;
    GDesc = list.d[CMt].EPolyGDesc;
     CMt = CMt + 1;
   }
alert(Points1.length);
if(Points1.length>0)
   {
   AddPolygonGraphics(Points1, gname, GDesc);
   Points1 = [];
}

function AddPolygonGraphics(Points1, gname, GDesc) {
                alert(Points1);
                Points1 = "[" + Points1 + "]"
                var polygon1 = new Polygon(new SpatialReference({ wkid: 4326 }));
                 //polygon1.addRing([[58.4245719470205, 23.582511030118049], [58.423799470824214, 23.594545845196812],[58.44002147094627, 23.5743298721676], [58.443798021239232, 23.578735174416867], [58.4245719470205, 23.582511030118049]]);
                polygon1.addRing(Points1);
//                alert(polygon1.rings[0].length);
                // map is in web mercator so transform the geometry
                var poly_wm = webMercatorUtils.geographicToWebMercator(polygon1);
                var symbol = new SimpleFillSymbol();
                var strhotspot = (gname.trim());
                if (GDesc != "")
                {
                    strhotspot = strhotspot + "," + (GDesc.trim());
                }
                var infoTemplate = new InfoTemplate();
                infoTemplate.content = strhotspot;
                var graphic = new Graphic(poly_wm, symbol);
                graphic.setInfoTemplate(infoTemplate);
                MyGraphicsLayerGL.add(graphic);

            }

Re: Adding Polygon

thejuskambi — Mon, 12 Oct 2015 17:28:14 GMT

you dont need "[". Just use Points1.push([list.d[CMt].EPolyLong, list.d[CMt].EPolyLat]);

doesn't it work?

again in AddPolygonGraphics you dont need to add "[" you are simply converting an array into string.

Re: Adding Polygon

JulieBiju — Mon, 12 Oct 2015 18:50:04 GMT

Yes dear friend,

Works well...Thank u so much....