topic Re: Drawing line with polyline.addPath in ArcGIS JavaScript Maps SDK Questions

Drawing line with polyline.addPath

MikeKillion — Fri, 23 Jul 2010 13:47:51 GMT

Hello,
I'm trying to draw a line on the map using the addPath method. Here's the code snippet (using v1.6):

var line = new esri.geometry.Polyline(new esri.SpatialReference( {wkid:102100} ));
var path = new Array();
   
for (i=0; i<xPoints.length; i++)
{
    coords = '[' + xPoints + ',' + yPoints + ']';
    path.push(coords);
}
   
alert(path);
   
line.addPath(path);

alert(line.paths);

The first alert shows the path formatted like this:
[-10993319,4632566],[-10907471,4612961]
which seems correct to me.

However, the second alert (after the path is added to the polyline) only shows 3 commas (,,,) so the path doesn't get added and the line doesn't draw.

Any ideas appreciated.
Mike

Re: Drawing line with polyline.addPath

KellyHutchins — Sat, 11 Dec 2021 23:58:35 GMT

It looks like you are creating a string that looks like an array from your x,y values. You should be able to do something like this instead:

         
var coords = [];
 var polyline = new esri.geometry.Polyline(new esri.SpatialReference({wkid:102100}));
    for (i=0;i < xPoints.length -1;i++){
        coords.push([xPoints, yPoints]);            
     }
 polyline.addPath(coords);

Re: Drawing line with polyline.addPath

MikeKillion — Mon, 26 Jul 2010 12:36:17 GMT

Thanks Kelly, that did it.

Re: Drawing line with polyline.addPath

deleted-user-0W0-oLHxDjCX — Thu, 31 Jan 2019 14:04:37 GMT

It is possible to add a midpoint without having the coordinate (only having the first and last point)?