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Merge several polygon in Javascript

rsharma

I want to merge random polygons placed on a graphics layer make a single polygon with only one boundary. Also how to unmerge them.

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Accepted answers

rsharma

I think this function works for only intersected boundaries: i used the solution below, and it is working fine.

merge.addEventListener('click',function(){
var updatedGeometry=new Array();
graphicsLayer.graphics.map(function(gra){
updatedGeometry.push(new Polygon((gra.geometry)));
});

var joinedPolygons = geometryEngine.union(updatedGeometry);
graphicsLayer.removeAll();
joinedPolygons.rings.forEach(function(ring)
{
resultpolygon={type:"polygon",rings:[ring]};
var resultgraphic =new Graphic({
geometry: resultpolygon,
symbol: resultsymbol
});

graphicsLayer.add(resultgraphic);
// console.log(ring);
});
});

All comments

rsharma

jQuery('#main').on('click','.merge_boundary',function(){
var updatedGeometry=new Array();
graphicsLayer.graphics.map(function(gra){
updatedGeometry.push(webMercatorUtils.webMercatorToGeographic(gra.geometry));
});
var joinedPolygons = geometryEngine.union(updatedGeometry);//it returned all polygons as it is, do not merge to make it one
console.log(joinedPolygons.rings);
addGraphics(joinedPolygons.rings);
});

RobertScheitlin__GISP

Correct. The Union works with the actual geometry not the layer.

rsharma

hi robert,

long time to hear from your side... how are you, well thanks for the reply, i already get the union link, but couldn't find any example, if u have any link then pls send..

like i have found this

Merge Polygons in JavaScript API 4.14

Do, i need to to loop through all the polygons of a layer, to get its graphics geomtrry

RobertScheitlin__GISP

Merge/Union: https://developers.arcgis.com/javascript/latest/api-reference/esri-geometry-geometryEngine.html#union

To un-merge you loop though the Polygons rings and copy those ring arrays to another Polygon class.

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