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geometryService.lengths() is not working on the 4.8

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09-20-2018 07:57 AM
RN
by
New Contributor II
‎09-20-2018 07:57 AM

Hello,

I've take the code from here :

ArcGIS API for JavaScript Sandbox 

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:

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

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

Thanks in advance

Best regards

RN

#geometryService

#lengths()

#4.8

#4.x

#a.toJSON

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Accepted Solutions
RobertScheitlin__GISP
by MVP Emeritus
MVP Emeritus
‎09-21-2018 06:05 AM

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;‍

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4 Replies
RobertScheitlin__GISP
by MVP Emeritus
MVP Emeritus
‎09-20-2018 08:33 AM

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]
        ]
      });‍‍‍‍‍‍‍‍‍
RN
by
New Contributor II
‎09-20-2018 11:05 PM

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>

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RobertScheitlin__GISP
by MVP Emeritus
MVP Emeritus
‎09-21-2018 06:05 AM

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;‍
RN
by
New Contributor II
‎09-21-2018 06:54 AM

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

RN

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