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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <title>Cropper.js</title>
  <link rel="stylesheet" href="../dist/cropper.css">
  <style>
    .container {
      max-width: 640px;
      margin: 20px auto;
    }

    img {
      max-width: 100%;
    }

    .cropper-view-box,
    .cropper-face {
      border-radius: 50%;
    }
  </style>
</head>
<body>

  <div class="container">
    <h1>Crop a round image</h1>
    <h3>Image</h3>
    <div>
      <img id="image" src="../docs/images/picture.jpg" alt="Picture">
    </div>
    <h3>Result</h3>
    <p>
      <button type="button" id="button">Crop</button>
    </p>
    <div id="result"></div>
  </div>

  <script src="../dist/cropper.js"></script>
  <script>
    (function () {

      function getRoundedCanvas(sourceCanvas) {
        var canvas = document.createElement('canvas');
        var context = canvas.getContext('2d');
        var width = sourceCanvas.width;
        var height = sourceCanvas.height;

        canvas.width = width;
        canvas.height = height;

        context.imageSmoothingEnabled = true;
        context.drawImage(sourceCanvas, 0, 0, width, height);
        context.globalCompositeOperation = 'destination-in';
        context.beginPath();
        context.arc(width / 2, height / 2, Math.min(width, height) / 2, 0, 2 * Math.PI, true);
        context.fill();

        return canvas;
      }

      window.addEventListener('DOMContentLoaded', function () {
        var image = document.getElementById('image');
        var button = document.getElementById('button');
        var result = document.getElementById('result');
        var croppable = false;
        var cropper = new Cropper(image, {
          aspectRatio: 1,
          viewMode: 1,
          ready: function () {
            croppable = true;
          }
        });

        button.onclick = function () {
          var croppedCanvas;
          var roundedCanvas;
          var roundedImage;

          if (!croppable) {
            return;
          }

          // Crop
          croppedCanvas = cropper.getCroppedCanvas();

          // Round
          roundedCanvas = getRoundedCanvas(croppedCanvas);

          // Show
          roundedImage = document.createElement('img');
          roundedImage.src = roundedCanvas.toDataURL()
          result.innerHTML = '';
          result.appendChild(roundedImage);
        };

      });

    })();
  </script>
</body>
</html>