title: how can i draw a line between two points on a grid in WPF
body: <p>I have a grid with 100 columns and 100 rows. I want to draw a line between the centre of one of those grid squares and another, say 45,25 to 75,38.</p>
  
  <p>I am happy with being able to draw a line, but how can i find the x and y pos of the centre of the two grid squares? Or is there a better approach i have missed</p>