topic geometryService.lengths() is not working on the 4.8 in ArcGIS JavaScript Maps SDK Questions

geometryService.lengths() is not working on the 4.8

RN — Thu, 20 Sep 2018 14:57:23 GMT

Hello,

I've take the code from here :

And i've added this code

var lengthParamsCliped = new LengthsParameters();
lengthParamsCliped.calculationType = 'geodesic';
lengthParamsCliped.geodesic = true;
lengthParamsCliped.lengthUnit = 'METER';
lengthParamsCliped.polylines = [polyline];

geometryService.lengths(lengthParamsCliped).then(calculatedClippedLength);

function calculatedClippedLength(res)
{
console.info(res);
}

The code stop with the message "a.toJSON is not a function"

Where a is the polyline who looks like that:

a: Object
paths: Array(3)
0: Array(2)
0: -111.3
1: 52.68
length: 2
__proto__: Array(0)
1: Array(2)
0: -98
1: 49.5
length: 2
__proto__: Array(0)
2: Array(2)
0: -93.94
1: 29.89
length: 2
__proto__: Array(0)
length: 3
__proto__: Array(0)
spatialReference:
wkid: 4326
__proto__: Object
type: "polyline"
__proto__: Object

I will be grateful if someone could help me to find a solution.

Thanks in advance

Best regards

#geometryService

#lengths()

#4.8

#4.x

#a.toJSON

Re: geometryService.lengths() is not working on the 4.8

RobertScheitlin__GISP — Fri, 10 Dec 2021 23:02:13 GMT

RN,

The LengthsParameters class does not autoCast the values of the polylines property to actual PolyLines. So you have to give it an array of ACTUAL polylines, not json representing Polylines.

      // First create a line geometry (this is the Keystone pipeline)
      var polyline = new Polyline({
        type: "polyline",
        paths: [
          [-111.30, 52.68],
          [-98, 49.5],
          [-93.94, 29.89]
        ]
      });‍‍‍‍‍‍‍‍‍

Re: geometryService.lengths() is not working on the 4.8

RN — Fri, 21 Sep 2018 06:05:01 GMT

Ok i've done that and its better because i dont have any errors but unfortunaly i dont have any result at all.

Im using a simple code like that just to understand how i can mesure the lenght of a polyline.

Please take a look here:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<title>Intro to graphics - 4.8</title>
<link rel="stylesheet" href="https://js.arcgis.com/4.8/esri/css/main.css">
<script src="https://js.arcgis.com/4.8/"></script>
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<script>
require([
"esri/Map",
"esri/views/MapView",
"esri/tasks/GeometryService",
"esri/tasks/support/LengthsParameters",
"esri/geometry/SpatialReference",
"esri/geometry/Polyline",
"esri/Graphic",
"dojo/domReady!"
], function(
Map, MapView, GeometryService, LengthsParameters, SpatialReference, Polyline, Graphic
) {
var map = new Map({
basemap: "topo"
});
var view = new MapView({
center: [-80, 35],
container: "viewDiv",
map: map,
zoom: 3
});
var geometryService = new GeometryService('http://sampleserver6.arcgisonline.com/arcgis/rest/services/Utilities/Geometry/GeometryServer');
/****************************
* Create a polyline graphic
****************************/
// First create a line geometry (this is the Keystone pipeline)
var polyline = new Polyline({
type: "polyline",
paths: [
[-111.30, 52.68],
[-98, 49.5],
[-93.94, 29.89]
],
spatialReference: { wkid: 4326 }
});
// Create a symbol for drawing the line
var lineSymbol = {
type: "simple-line", // autocasts as SimpleLineSymbol()
color: [226, 119, 40],
width: 4
};
var polylineGraphic = new Graphic({
geometry: polyline,
symbol: lineSymbol
});
view.graphics.add(polylineGraphic);
// try to find the lenght of a polyline
var myLongueur;
var lengthParamsCliped = new LengthsParameters();
lengthParamsCliped.calculationType = 'geodesic';
lengthParamsCliped.geodesic = true;
lengthParamsCliped.lengthUnit = 'METER';
lengthParamsCliped.polylines = [polyline];

geometryService.lengths(lengthParamsCliped).then(function (calculatedClippedLength) {
if (calculatedClippedLength.lengths.length > -1) {
myLongueur = calculatedClippedLength.lengths[0];
console.info(myLongueur);
}
});
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>

Re: geometryService.lengths() is not working on the 4.8

RobertScheitlin__GISP — Fri, 21 Sep 2018 13:05:59 GMT

R N,

The doc is not very clear when it say a string or number for the length unit it is expecting the numeric value of the unit as a number or a string. METER = 9001

lengthParamsCliped.lengthUnit = 9001;‍

Re: geometryService.lengths() is not working on the 4.8

RN — Fri, 21 Sep 2018 13:54:12 GMT

You have make my weekend better, i've tried so hard to find a solution and i've knew it was something little to find.

Best regards