demos/droppable-custom-overlap.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>jquery.pep droppable w/ custom overlap</title>

    <!-- Load local jQuery.  -->
    <script src="../libs/jquery/jquery.js"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/modernizr/2.6.2/modernizr.min.js"></script>

    <!-- Load local lib and tests. -->
    <script src="../src/jquery.pep.js"></script>

    <script type="text/javascript">
      $(document).ready(function(){
        $('.pep').pep({
          droppable: ".droppable",
          overlapFunction: function($a, $b){
            var rect1 = $a[0].getBoundingClientRect();
            var rect2 = $b[0].getBoundingClientRect();

            return (  rect2.left    > rect1.left  && 
                      rect2.right   < rect1.right && 
                      rect2.top     > rect1.top   && 
                      rect2.bottom  < rect1.bottom  );
          },
          useCSSTranslation: false
        });
      });
    </script>

    <style type="text/css">
      .pep{ width: 40px; height: 40px; background: blue; z-index: 10; }
      .droppable{   width: 100px; height: 100px; 
                    position: absolute; 
                    border: 5px solid #ccc; }

      .droppable.m  { top: 50%; left:50%; margin-left: -50px; margin-top: -50px; }
      .droppable.tr { right:  30px; bottom:  30px; }
      .droppable.br { top:    30px; right:   30px;}
      .droppable.bl { top:    30px; left:    30px;}
      .droppable.tl { bottom: 30px; left:    30px;}
      .pep-dpa      { border-color: blue; background: yellow }
    </style>

  </head>


  <body>
    <div class="pep"></div>
    <div class="droppable m"></div>
    <div class="droppable tr"></div>
    <div class="droppable br"></div>
    <div class="droppable bl"></div>
    <div class="droppable tl"></div>
  </body>


</html>