title: find out if long/lat within rectangle
body: <p>Given a top-left long/lat and a bottom-right long/lat how can i find out if a given long/lat falls within the rectangle ?</p>
  
  <p>Ideally i would be looking at something like</p>
  
  <pre><code>bool IsWithinArea(float topLeftLat,float topLeftLong,
     float bottomRightLat,float bottomRightLong,float testLat,float testLong)
  </code></pre>
  
  <p><strong>Update</strong></p>
  
  <p>The one problem is that the rectangle created from the long/lat may be from a rotated map, so bottom right will not always be greater than top left...</p>