f;
  }
  #draw {
    margin-left: 100px;
  }
  svg {
    border: 1px solid black;
  }
  </style>
  
  <script type="application/javascript">
    
    var W = 600, H = 600;
    var d3line = null;
    var d3agent = null;
    var d3target = null;
    var d3target2 = null;
    var d3target2_radius = null;
    var initDraw = function() {
      var d3elt = d3.select('#draw');
      d3elt.html('');

      var w = 600;
      var h = 600;
      svg = d3elt.append('svg').attr('width', w).attr('height', h)
        .ap