JSAPI Buffer Code Not Measuring Up?

BrianO_keefe — Tue, 18 Oct 2016 14:27:39 GMT

So I have put together a rudimentary widget that allows an internal department to generate Buffers around a point based on precise requirements that they have. They need to click a point on the map and generate a 1,000 and a 3,000 foot buffer.

Assistance Building First Widget : Buffer Points?

So I've got it working.

ArcGIS Web Application

However, when you measure from the center to the edge of the buffers you don't get 1,000 nor 3,000 feet buffers on screen. The buffer that is supposed to be 1,000 feet is 800 feet and the 3,000 is more like 2,500 feet?!

Any ideas? Robert Scheitlin, GISP‌?

Re: JSAPI Buffer Code Not Measuring Up?

RobertScheitlin__GISP — Sun, 12 Dec 2021 09:42:34 GMT

Brain,

You need to specify the buffers spatial reference (line 17, 44, 67):

define([
    'dojo/_base/declare',
    'jimu/BaseWidget',
    'dijit/_WidgetsInTemplateMixin',
    "dojo/dom",
    "dojo/_base/array",
    "dojo/parser",
    "dojo/query",
    "dojo/on",
    "dojo/_base/lang",
    "esri/Color",
    "esri/config",
    "esri/map",
    "esri/graphic",
    "esri/geometry/normalizeUtils",
    "esri/tasks/GeometryService",
    "esri/SpatialReference",
    "esri/tasks/BufferParameters",
    "jimu/dijit/DrawBox",
    "esri/symbols/SimpleMarkerSymbol",
    "esri/symbols/SimpleLineSymbol",
    "esri/symbols/SimpleFillSymbol",
    "dijit/layout/BorderContainer",
    "dijit/layout/ContentPane",
    "dijit/form/Button",
    "dojo/domReady!"
  ],
  function(
    declare,
    BaseWidget,
    _WidgetsInTemplateMixin,
    dom,
    array,
    parser,
    query,
    on,
    lang,
    Color,
    esriConfig,
    Map,
    Graphic,
    normalizeUtils,
    GeometryService,
    SpatialReference,
    BufferParameters,
    DrawBox,
    SimpleMarkerSymbol,
    SimpleLineSymbol,
    SimpleFillSymbol
) {

.....

      createCOTBuffers: function(evtObj) {
        this.drawBox.deactivate();
        var geometry = evtObj.geometry,
            symbol;
        symbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_SQUARE, 10, new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, new Color([255, 0, 0]), 1), new Color([0, 255, 0, 0.25]));
        var graphic = new Graphic(geometry, symbol);
        this.map.graphics.add(graphic);
        this.drawBox.clear();
        //setup the buffer parameters
        var params = new BufferParameters();
        params.distances = [this.firstDistance.value, this.secondDistance.value];
        params.outSpatialReference = this.map.spatialReference;
        params.unit = GeometryService[this.unit.value];
        params.bufferSpatialReference = new SpatialReference({wkid: 102003})
        //normalize the geometry
        normalizeUtils.normalizeCentralMeridian([geometry]).then(lang.hitch(this, function(normalizedGeometries) {
          var normalizedGeometry = normalizedGeometries[0];
          params.geometries = [normalizedGeometry];
          esriConfig.defaults.geometryService.buffer(params, lang.hitch(this, this.showCOTBuffers));
        }));
      },‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

topic Re: JSAPI Buffer Code Not Measuring Up? in Web AppBuilder Custom Widgets Questions

JSAPI Buffer Code Not Measuring Up?

Re: JSAPI Buffer Code Not Measuring Up?