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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="../css/cropper.css">
+ <style>
+ .container {
+ margin: 20px auto;
+ max-width: 640px;
+ }
+
+ 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="../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="../js/cropper.js"></script>
+ <script>
+ 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 maskedCanvas;
+ var maskedImage;
+
+ 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>