title: fabricjs can works for a donout chart?
body: <p>i try to make this with circle and use startAnge and endAngle but when i want to draw filled part with one color and other color for outside not let me ..or at least not found a way..i try to make groups..one circle for filled part and other circle in same position for outfilled part ..seems not work for me..
  any ideas?
  here the demo <a href="https://jsfiddle.net/mavirroco/on0xg64k/" rel="nofollow">https://jsfiddle.net/mavirroco/on0xg64k/</a></p>
  
  <pre><code>    var canvas = new fabric.Canvas('c');
  
  var circle = new fabric.Circle({
          radius: 40,
          left: 100,
          top: 300,
          angle: -90,
          startAngle: 0,
          endAngle: 1.5*Math.PI,
          stroke: '#000',
          strokeWidth: 25,
          fill: ''
  });
  
  var circle2 = new fabric.Circle({
          radius: 40,
          left: 100,
          top: 300,
          angle: -90,
          startAngle: 0,
          endAngle: 1.5*Math.PI,
          stroke: '#000',
          strokeWidth: 25,
          fill: ''
  });
  
  var circle3 = new fabric.Circle({
          radius: 40,
          left: 100,
          top: 300,
          angle: -90,
          startAngle: 0,
          endAngle: 1.5*Math.PI,
          stroke: '#000',
          strokeWidth: 25,
          fill: ''
  });
  canvas.add(circle);
  </code></pre>
  
  <p>regards</p>