how to get the point of polygon

[yanli]

how  to  get  four  point  of  Rectangle   polygon  with   arcgis server  for  js

[__Rich_]

Label Points?

[__Rich_]

Polygons are made up of rings, rings are made up of points.

This same 'path' can be used following, for example, an Identify operation to get the points of a feature.

[yanli]

Polygons are made up of rings, rings are made up of points.

This same 'path' can be used following, for example, an Identify operation to get the points of a feature.

thank  you , can  you  give me    a  example  with  code?
thank  you  very  much

[__Rich_]

can  you  give me    a  example  with  code?

I'm not going to do it all for you 🙂

But here's one approach, assume you've got a polygon (thePoly), perhaps it's the geometry property of a Graphic:

for(var i=0;i<thePoly.rings.length;i++){
    console.log("Getting points from ring #" + i);
    for(var j=0;j<thePoly.rings.length;j++){
        console.log("Point #" + j + " x=" + thePoly.rings[0] + " y=" + thePoly.rings[1] + " (using array access)");
        console.log("Point #" + j + " x=" + thePoly.getPoint(i, j).x + " y=" + thePoly.getPoint(i, j).y + " (using getPoint())");
    }
}
//Could replace the  access with a call to thePoly.getPoint(i,j) if you like which would return a copy of the Point rather than a reference to the actual Point

(haven't tested the code, just typed straight into this post, should be roughly right though)

[yanli]

I'm not going to do it all for you 🙂

But here's one approach, assume you've got a polygon (thePoly), perhaps it's the geometry property of a Graphic:

for(var i=0;i<thePoly.rings.length;i++){
    console.log("Getting points from ring #" + i);
    for(var j=0;j<thePoly.rings.length;j++){
        console.log("Point #" + j + " x=" + thePoly.rings.x + " y=" + thePoly.rings.y);
    }
}
//Could replace the  access with a call to thePoly.getPoint(i,j) if you like which would return a copy of the Point rather than a reference to the actual Point

(haven't tested the code, just typed straight into this post, should be roughly right though)

thank you ,
i have test the code 
it  is  failse  to get  x =thePoly.rings.x

it is ok  like  var pt=thePoly.getPoint(i,j); var x=pt.x;

[__Rich_]

it  is  failse  to get  x =thePoly.rings.x

Told you I hadn't tested it 🙂

I assumed that the points in the ring would be stored as Point objects whereas they're actually stored internally as simple arrays - have changed the code above.

Presumably this has answered your question?