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/home/platinum/www/media/plg_media-action_rotate/js/rotate.js

/**
 * @copyright  (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */
let activated = false;

// Update image
const rotate = (angle, image) => {
  // The canvas where we will rotate the image
  let canvas = document.createElement('canvas');

// Pseudo rectangle calculation
  if (angle >= 0 && angle < 45 || angle >= 135 && angle < 225 || angle >= 315 && angle <= 360) {
    canvas.width = image.naturalWidth;
    canvas.height = image.naturalHeight;
  } else {
    // swap
    canvas.width = image.naturalHeight;
    canvas.height = image.naturalWidth;
  }
  const ctx = canvas.getContext('2d');
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  ctx.translate(canvas.width / 2, canvas.height / 2);
  ctx.rotate(angle * Math.PI / 180);
  ctx.drawImage(image, -image.naturalWidth / 2, -image.naturalHeight / 2);

// The format
  const format = Joomla.MediaManager.Edit.original.extension === 'jpg' ? 'jpeg' : 'jpg';

// The quality
  const quality = document.getElementById('jform_rotate_quality').value;

// Creating the data from the canvas
  Joomla.MediaManager.Edit.current.contents = canvas.toDataURL(`image/${format}`, quality);

// Updating the preview element
  image.width = canvas.width;
  image.height = canvas.height;
  image.src = '';
  requestAnimationFrame(() => requestAnimationFrame(() => {
    image.src = Joomla.MediaManager.Edit.current.contents;
  }));

// Update the angle input box
  document.getElementById('jform_rotate_a').value = angle;

// Notify the app that a change has been made
  window.dispatchEvent(new Event('mediaManager.history.point'));
  canvas = null;
};
const initRotate = image => {
  if (!activated) {
    // The number input listener
    document.getElementById('jform_rotate_a').addEventListener('change', ({
      target
    }) => {
      rotate(parseInt(target.value, 10), image);
      target.value = 0;
      // Deselect all buttons
      [].slice.call(document.querySelectorAll('#jform_rotate_distinct label')).forEach(element => {
        element.classList.remove('active');
        element.classList.remove('focus');
      });
    });

// The 90 degree rotate buttons listeners
    [].slice.call(document.querySelectorAll('#jform_rotate_distinct [type=radio]')).forEach(element => {
      element.addEventListener('click', ({
        target
      }) => {
        rotate(parseInt(target.value, 10), image);

// Deselect all buttons
        [].slice.call(document.querySelectorAll('#jform_rotate_distinct label')).forEach(el => {
          el.classList.remove('active');
          el.classList.remove('focus');
        });
      });
    });
    activated = true;
  }
};
window.addEventListener('media-manager-edit-init', () => {
  // Register the Events
  Joomla.MediaManager.Edit.plugins.rotate = {
    Activate(image) {
      return new Promise(resolve => {
        // Initialize
        initRotate(image);
        resolve();
      });
    },
    Deactivate( /* image */
    ) {
      return new Promise(resolve => {
        resolve();
      });
    }
  };
}, {
  once: true
});