topic draw circles on the graphics layer in ArcGIS Runtime SDK for WPF (Retired) Questions

draw circles on the graphics layer

RussellEgypt — Thu, 07 Feb 2013 16:09:57 GMT

Hi

I'm new to ArcGIS Runtime. Just looking for a solution to programmatically draw circles on the map within the graphics layer, having a file with center points and the circle radius.

Thanks

Re: draw circles on the graphics layer

norie — Fri, 10 Dec 2021 20:35:06 GMT

Since you have the center and radius, you can derive the points along the circumference and produce a polygon.

private ESRI.ArcGIS.Client.Geometry.Polygon DrawCircle(ESRI.ArcGIS.Client.Geometry.MapPoint center, double radius, int pointsCount = 360) {
 ESRI.ArcGIS.Client.Geometry.Polygon p = new ESRI.ArcGIS.Client.Geometry.Polygon();
 ESRI.ArcGIS.Client.Geometry.PointCollection pcol = new ESRI.ArcGIS.Client.Geometry.PointCollection();
 double slice = 2 * Math.PI / pointsCount;
 for (int i = 0; i <= pointsCount; i++) {
  double rad = slice * i;
  double px = center.X + radius * Math.Cos(rad);
  double py = center.Y + radius * Math.Sin(rad);
  pcol.Add(new ESRI.ArcGIS.Client.Geometry.MapPoint(px, py));
 }
 p.Rings.Add(pcol);
 return p;
}

Re: draw circles on the graphics layer

dotMorten_esri — Fri, 08 Feb 2013 15:54:42 GMT

Here's a slightly different approach, which is done by subclassing Polygon:http://forums.esri.com/Thread.asp?c=213&f=2455&t=289039#898885

Basically allows you to write :
var polygon = new Circle() { Center=new MapPoint(-117,34), Radius = 2 };

Re: draw circles on the graphics layer

RussellEgypt — Mon, 11 Feb 2013 04:50:14 GMT

Thankyou for the response and your working solutions!

I've used Aaron Noriega solution!