Drawing a circle around a point

[TomRauch]

Hi, I would like some help understanding how to draw a circle showing the perceived radius of an earthquake (from a value held in my database) with the epicenter at the center of the circle.  For example, an earthquake with a magnitude of 4.6 could have a perceived radius of 50+ miles.  I would like to show that radius as a colored circle with no fill, if that makes sense.

Thanks, Tom

[RobertScheitlin__GISP]

Tom,

   Look at the buffer sample:

http://resources.arcgis.com/en/help/flex-api/samples/01nq/01nq0000002q000000.htm

[TomRauch]

Hi Robert, I did look at the buffer sample but am still stumped.  I am not sure what the 'polylines' refer to in the buffer.geometries lines, I suspect these are important but not sure how to use them to drive a circle with a radius that comes from a variable I set.

Thanks, Tom

[RobertScheitlin__GISP]

Tom,

   If you look at the sample it is buffering polylines, that is what the lines are about. There is not a specific sample that buffers points. But the concept is identical just feed the project function MapPoint geometry instead of a polyline. You can also download and look at specific code for buffering point geometries from my point buffer widget.

http://www.arcgis.com/home/item.html?id=a950162cd17a4acc985132d40adfe38f

[AndyGup]

Tom,

Not sure if this is exactly what you need, but attached is an ActionScript library that shows various methods for drawing a circle on the client using radius as an input property.


-Andy

[stevemclaughlin]

This is great, thanks Andy!