title: How do I create an array of the objects that are on the outside of a cluster?
body: <p>Hello dear programmer,</p>
  
  <p>I am working on a little program (in C#) where some objects are clustered. The clusters can change shape in the program but I always want a line between (or even around) the outer objects (a little bit like a cell wall in biology). My approach is trying to get the coordinates of the outer objects in an array and draw a polygon between the coordinates. Can anyone give me a suggestion on how I can achieve this or show me an example of how it is done elsewhere?</p>
  
  <p>Thanks for your help!</p>
  
  <p>A</p>