Get each polygon Id!

ArcGISG_I_S · ‎12-15-2014

Dear All,

I create a prototype which add a group of point to the map and create the drive time polygon around each point (Based on service area sample). The prototype is creating the polygons in the same time but i cannot control each polygon separately, i would like to create an Id for each polygon created around each point so i can use them for other query like polygon intersect ...

Below the code i create if anyone can help i will be grateful:

<!DOCTYPE html>

<html>

<head>

<!--The viewport meta tag is used to improve the presentation and behavior of the samples

on iOS devices-->

<title>Dispatch Algorithm Implementation</title>

<style>

body,html,#main{margin:0;padding:0;height:100%;width:100%;}

</style>

dojo.require("esri.map");

dojo.require("esri.tasks.servicearea");

dojo.require("dijit.dijit");

dojo.require("dijit.layout.BorderContainer");

dojo.require("dijit.layout.ContentPane");

dojo.require("dijit.form.HorizontalSlider");

dojo.require("dijit.form.HorizontalRuleLabels");

dojo.require("dijit.form.HorizontalRule");

dojo.require("dijit.form.Button");

dojo.require("esri.graphic");

dojo.require("esri.tasks.geometry");

dojo.require("esri.layers.graphics");

dojo.require("esri.Color");

var map, serviceAreaTask, params, clickpoint, gsvc;

function init() {

esri.config.defaults.io.proxyUrl = "/proxy";

map = new esri.Map("map", {

basemap: "streets",

center: [-122.447, 37.781],

zoom: 14

});

params = new esri.tasks.ServiceAreaParameters();

params.defaultBreaks= [1];

params.outSpatialReference = map.spatialReference;

params.returnFacilities = false;

serviceAreaTask = new esri.tasks.ServiceAreaTask("http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Network/USA/NAServer/Service Area");

gsvc = new esri.tasks.GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");

dojo.connect(dijit.byId("hslider"), "onChange", updateHorizontalLabel);

updateHorizontalLabel();

}

// Create function that updates label when changed

function updateHorizontalLabel() {

// Get access to nodes/widgets we need to get/set values

var hSlider = dijit.byId("hslider");

var label = dojo.byId("decValue");

// Update label

label.innerHTML = hSlider.get("value");

params.defaultBreaks = [hSlider.value/60];

// if (typeof clickpoint != 'undefined') {

// AddDT(clickpoint);

// };

}

//Clears DTP

function ClearDTP() {

map.graphics.clear();

}

function AddDTP() {

map.graphics.clear(); //clear existing graphics

//define the symbology used to display the results and input point

var pointSymbol = new esri.symbol.PictureMarkerSymbol({

"angle":0,

"xoffset":0,

"yoffset":10,

"type":"esriPMS",

"url":"http://icons.iconarchive.com/icons/aha-soft/standard-transport/256/police-car-icon.png",

"contentType":"image/png",

"width":30,

"height":30

});

var m_mapPoint = [];

m_mapPoint[1] = new esri.geometry.Point([-122.447, 37.781],new esri.SpatialReference({ wkid:4326 }));

m_mapPoint[2] = new esri.geometry.Point([-122.457, 37.791],new esri.SpatialReference({ wkid:4326 }));

m_mapPoint[3] = new esri.geometry.Point([-122.450, 37.785],new esri.SpatialReference({ wkid:4326 }));

m_mapPoint[4] = new esri.geometry.Point([-122.452, 37.775],new esri.SpatialReference({ wkid:4326 }));

m_mapPoint[5] = new esri.geometry.Point([-122.452, 37.791],new esri.SpatialReference({ wkid:4326 }));

m_mapPoint[6] = new esri.geometry.Point([-122.450, 37.777],new esri.SpatialReference({ wkid:4326 }));

var location1 = new esri.Graphic(m_mapPoint[1],pointSymbol);

var location2 = new esri.Graphic(m_mapPoint[2],pointSymbol);

var location3 = new esri.Graphic(m_mapPoint[3],pointSymbol);

var location4 = new esri.Graphic(m_mapPoint[4],pointSymbol);

var location5 = new esri.Graphic(m_mapPoint[5],pointSymbol);

var location6 = new esri.Graphic(m_mapPoint[6],pointSymbol);

map.graphics.add(location1);

map.graphics.add(location2);

map.graphics.add(location3);

map.graphics.add(location4);

map.graphics.add(location5);

map.graphics.add(location6);

var features = [];

features.push(location1);

features.push(location2);

features.push(location3);

features.push(location4);

features.push(location5);

features.push(location6);

var facilities = new esri.tasks.FeatureSet();

facilities.features = features;

params.facilities = facilities;

//solve

serviceAreaTask.solve(params,function(solveResult){

var result = solveResult;

var serviceAreaSymbol = new esri.symbol.SimpleFillSymbol(

esri.symbol.SimpleFillSymbol.STYLE_SOLID,

new esri.symbol.SimpleLineSymbol(

esri.symbol.SimpleLineSymbol.STYLE_SOLID,

new dojo.Color([232,104,80]), 2

),

new dojo.Color([232,104,80,0.25])

);

var polygonSymbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID,

new dojo.Color([232,104,80]), 2),new dojo.Color([232,104,80,0.25]));

dojo.forEach(solveResult.serviceAreaPolygons, function(serviceArea){

serviceArea.setSymbol(polygonSymbol);

map.graphics.add(serviceArea);

});

},function(err){

console.log(err.message);

});

}

dojo.ready(init);

</script>

</head>

<b>Choose your threshold to find the appropriate dispatch:</b>

<ol data-dojo-type="dijit.form.HorizontalRuleLabels"

data-dojo-props="

container: 'topDecoration',

style: 'height: 1.2em; font-weight: bold; margin: 0 12px;'">

</ol>

<div data-dojo-type="dijit.form.HorizontalRule"

data-dojo-props="

container: 'topDecoration',

count: 7,

style: 'height: 5px; margin: 0 12px;'">

</div>

<input id="hslider" value="60" type="range"

data-dojo-type="dijit.form.HorizontalSlider"

data-dojo-props="

minimum: 0,

maximum: 120,

showButtons: false,

discreteValues: 25">

<div style="padding-top: 10px; text-align: center;">Travel time: <strong id="decValue"></strong> Seconds</div>

<label class="form_col" for="NumberPC">Please Enter a Number of Patrol Car:</label>

<option value="none">Select your zone</option>

</select>

<button onclick="AddDTP();">Dispatch</button>

<button onclick="ClearDTP();">Clear Dispatch</button>

</div>

</div>

</body>

</html>

Thanks a lot for your support.

MahtabAlam1 · ‎12-16-2014

Each polygon graphic is having attributes information that gives the FacilityID. Which is nothing but the id of the point that you are adding in the facilities. You can add attribute information in point and use that to query it's polygon.

Thanks,

Mahtab

ArcGISG_I_S · ‎12-17-2014

Thank you for you replay

But can i check if two polygon (Drive time polygon) intersect if i use point ID?

OwenEarley · ‎12-16-2014

Check this reference - Working with Objects

In Javascript you can just add your ID property to each graphic as you are adding them to your map:

        var id = 0;

        dojo.forEach(solveResult.serviceAreaPolygons, function(serviceArea){
         
          // Add a custom id property and value:
          serviceArea.customId = id;
          id += 1; // increment the ID value

          serviceArea.setSymbol(polygonSymbol);
          map.graphics.add(serviceArea);
        });

If you log the results to the console you can see your new property values:

Just make sure not use existing object property names for your new property.

ArcGISG_I_S · ‎12-17-2014

Dear Mr Owen,

Thank you very much for your replay.

Your answer is very helpful. Can i have a control of that Polygon Id because i have to keep only points when polygon do not intersect.

Exemple

I will keep the first point polygon and add the second one if the polygon of the second one intersect with the first one i delete the second one and go to the other one.

Now in the console i am having the same result but i don't know if i can do intersect query on that polygon ?

OwenEarley · ‎12-17-2014

In regards to the custom polygon id value - you have full control over the name of the property and its value.

To do an intersect query on the polygon you would need to use a GeometryService.

Then you can use the intersect() method to test if the polygons overlap. If you just want the combined area of all polygons then you could use the union() method.

You would need to pass in each serviceArea.geometry to the intersect or union methods.

ArcGISG_I_S · ‎12-21-2014

Sorry for the delay of my answer i was sick

I am already using a geometry service, and now i know that each polygon have a Id.

What i want to do is to keep the first polygon and check the second one if it intersect with the first one i will keep it otherwise i will delete that polygon and go to the next one.

This task i really don't know how to proceed if some you can help i will be very greatfull

ArcGISG_I_S · ‎12-24-2014

Dear Owen,

I tried this code to verify if two polygons intersect or not?

I changed this part dojo.forEach(solveResult.serviceAreaPolygons, function(serviceArea){ by the code below.

It's not working you can have a look on it please.

var polys = solveResult.serviceAreaPolygons;

for(var i=0; i<polys.length; i++)

{

// Collect point of the first polygon from the feature list

pointPoly = features[polys["attributes"]["facilityId"] - 1]

for(var j=i+1; j<polys.length; j++)

{

// Verify if the polygon polys intersect pointPoly

var test = intersect(polys, pointPoly);

function intersectionPolygons(polys, pointPoly)

{

// if yes

if(test = true)

{

// Deleate the polygon from the list

polys.splice(j,1);

// Reduce the values due to size change in the index table

j--;

i--;

}

// else go to the next iteration

}

I really need it urgent thanks a lot for your support

ArcGISG_I_S · ‎12-24-2014

Below the new code i create but still not working

<!DOCTYPE html>

<html>

<head>

<!--The viewport meta tag is used to improve the presentation and behavior of the samples

on iOS devices-->

<title>Dispatch Algorithm Implementation</title>

<style>

body,html,#main{margin:0;padding:0;height:100%;width:100%;}

</style>

dojo.require("esri.map");

dojo.require("esri.tasks.servicearea");

dojo.require("dijit.dijit");

dojo.require("dijit.layout.BorderContainer");

dojo.require("dijit.layout.ContentPane");

dojo.require("dijit.form.HorizontalSlider");

dojo.require("dijit.form.HorizontalRuleLabels");

dojo.require("dijit.form.HorizontalRule");

dojo.require("dijit.form.Button");

dojo.require("esri.graphic");

dojo.require("esri.tasks.geometry");

dojo.require("esri.layers.graphics");

dojo.require("esri.Color");

var map, serviceAreaTask, params, clickpoint, gsvc;

function init() {

esri.config.defaults.io.proxyUrl = "/proxy";

map = new esri.Map("map", {

basemap: "streets",

center: [-122.447, 37.781],

zoom: 14

});

params = new esri.tasks.ServiceAreaParameters();

params.defaultBreaks= [1];

params.outSpatialReference = map.spatialReference;

params.returnFacilities = true;