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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 {
      background-color: black;
      opacity: 1;
    }

  </style>
</head>

<body>

  <div class="container">
    <h1>Mask an image (Redaction)</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">Mask</button></p>
    <div id="result"></div>
  </div>

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

      function getMaskedCanvas(sourceCanvas, sourceImage, cropper) {
        var canvas = document.createElement('canvas');
        var context = canvas.getContext('2d');

        var maskWidth = cropper.getData().width;
        var maskHeight = cropper.getData().height;
        var maskTop =  cropper.getData().y;
        var maskLeft =  cropper.getData().x;

        var imageWidth = cropper.getImageData().naturalWidth;
        var imageHeight = cropper.getImageData().naturalHeight;
        var imageLeft = cropper.getImageData().left;
        var imageTop = cropper.getImageData().top;
        var imageAspect = cropper.getImageData().aspectRatio;

        canvas.width = imageWidth;
        canvas.height = imageHeight;

        // debug
        console.log('Image Width: ' + imageWidth  + ' Image Height: ' + imageHeight + ' Image Aspect Ratio: ' + imageAspect );
        console.log('Image Left: ' + imageLeft  + ' Image Top: ' + imageTop );
        console.log('Mask Width: ' + maskWidth + ' Mask Height: ' + maskHeight + ' Mask Left: ' + maskLeft + ' Mask Top: ' + maskTop);

        context.imageSmoothingEnabled = true;
        context.drawImage(image, 0, 0, imageWidth, imageHeight);
        context.fillRect(maskLeft, maskTop, maskWidth, maskHeight);

        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, {
          viewMode: 0,
          guides: true,
          center: true,
          highlight: true,
          cropBoxMovable: true,
          cropBoxResizable: true,
          ready: function () {
            croppable = true;
          }
        });

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

          if (!croppable) {
            return;
          }

          // Crop
          croppedCanvas = cropper.getCroppedCanvas();

          // Mask
          maskedCanvas = getMaskedCanvas(croppedCanvas, image, cropper);

          // Show
          maskedImage = document.createElement('img');
          maskedImage.src = maskedCanvas.toDataURL()
          result.innerHTML = '';
          result.appendChild(maskedImage);

        };

      });

    })();

  </script>
</body>

</html>