RepositorySys/wwwroot/cropperjs-main/docs/examples/crop-on-canvas.html

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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%;
    }
  </style>
</head>
<body>
  <div class="container">
    <h1>Crop on canvas with Cropper</h1>
    <h3>Image</h3>
    <div class="img-container">
      <img id="image" src="../images/picture.jpg" alt="Picture">
    </div>
    <h3>Canvas</h3>
    <div class="img-container">
      <canvas id="canvas"></canvas>
    </div>
  </div>

  <script src="../js/cropper.js"></script>
  <script>
    function start() {
      var width = this.offsetWidth;
      var height = this.offsetHeight;
      var cropper;

      canvas.width = width;
      canvas.height = height;
      canvas.getContext('2d').drawImage(
        this,
        0, 0, this.naturalWidth, this.naturalHeight,
        0, 0, width, height
      );
      cropper = new Cropper(canvas);
    }

    window.addEventListener('DOMContentLoaded', function () {
      var canvas = document.getElementById('canvas');
      var image = document.getElementById('image');

      if (image.complete) {
        start.call(image);
      } else {
        image.onload = start;
      }
    });
  </script>