create fabricjs custom bounding box -


i used fabric.circle create semi circle. not able set bounding box. how can set bounding box cover whole semi circle.

$(document).ready(function() {      //getting canvas      var canvas = new fabric.canvas("canvas");      var pointarray = [];      var semicircle, ismousedown = false;      $('#selection').click(function() {          canvas.selection = true;          changestatus(true);          //remove mouse event          canvas.off('mouse:down', onmousedown);          canvas.off('mouse:move', onmousemove);          canvas.off('mouse:up', onmouseup);      })        function changestatus(value) {          canvas.foreachobject(function(obj) {              obj.selectable = value;          })          canvas.renderall();      }      $('#semicircle').click(function() {          canvas.selection = false;          changestatus(false);          //register mouse event          canvas.on('mouse:down', onmousedown);          canvas.on('mouse:move', onmousemove);          canvas.on('mouse:up', onmouseup);      });        function onmousedown(event) {          //defining procedure          ismousedown = true;          var pointer = canvas.getpointer(event.e);          //creating semicircle object          if (pointarray.length < 1)              pointarray.push(pointer);          if (pointarray.length == 1) {              semicircle = new fabric.circle({                  radius: 0,                  stroke:'magenta',                  fill: '',                  left: pointer.x,                  top: pointer.y,                  originx: 'center',                  originy: 'center',                  selectable: false,              });              canvas.add(semicircle);          }      }        function onmousemove(options) {          // defining procedure          if (!ismousedown) {              return;          }          if (semicircle != null) {              var pointer = canvas.getpointer(options.e);              pointarray[1] = pointer;              var radius = parseint(math.sqrt(math.pow((pointarray[1].x - pointarray[0].x), 2) + math.pow((pointarray[1].y - pointarray[0].y), 2)));              var centerx = (pointarray[1].x + pointarray[0].x) / 2;              centery = (pointarray[1].y + pointarray[0].y) / 2,                  dx1 = pointarray[1].x - pointarray[0].x,                  dy1 = pointarray[1].y - pointarray[0].y,                  firstangle = math.atan2(dy1, dx1),                  secondangle = firstangle + math.pi;                semicircle.set({                  left: centerx,                  top: centery,                  radius: radius / 2,                  startangle: firstangle,                  endangle: secondangle,                  endpoint: pointer              });              semicircle.setcoords();              canvas.renderall();          }      }        function onmouseup() {          //alert("mouse up!");          ismousedown = false;          if (pointarray.length == 2) {              semicircle = null;              canvas.renderall();              pointarray = [];          }      }  });
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/1.7.18/fabric.js" charset="utf-8"></script>  <script src="https://code.jquery.com/jquery-3.2.1.js" charset="utf-8"></script>  <input type="button" id="semicircle" value="semicircle">  <input type="button" id="selection" value="selection"><br>  <canvas id="canvas" width=500 height=500 style="height:500px;width:500px;"></canvas>


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