Insert PointCollection Problem

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C#

WPF

Hi all,

I have a list of points created during design time. when I run my program a shape is created according to the order in which the points have been added. When I then click on the shape , a new point is created according to the position of the mouse relative to the drawing area in my application. My problem is , my list is already in a specific order and I am having trouble figuring out a proper method to work out if the new point is before or after the current point already drawn on the shape.

Here is an illustration of my problem

This is the Shape ive drawn when the app starts:

 150,150
 270, 150
 270, 270
 150, 270
 150, 150


150,150  o-----------o 270, 150
         |           | 
         |           | 
         |           |
150, 270 o-----------o 270, 270

And this is what I want to do

 150,150
 270, 150
 270, 270
 265 ,270  #inserted here dynamically
 150, 270
 150, 150


150,150  o-----------o 270, 150
         |           | 
         |           | 
         |           |
150, 270 o-----o-----o 270, 270
            265,270