Here's a quick-n-dirty demo with image loaded from a file: https://codepen.io/helb/full/LmVjjG/ https://codepen.io/helb/full/LmVjjG/ Code is mostly taken from

Here's a quick-n-dirty demo with image loaded from a file: https://codepen.io/helb/full/LmVjjG/ https://codepen.io/helb/full/LmVjjG/ Code is mostly taken from the project's github, i just added file selection and image resizing to fit canvas.