Just open the html file in a html5 compatible browser with javascript enabled.
You are allowed to do whatever you want with this code, except:
- You may not take this software without modifications, and claim it as your own.
- Any modifications made by you must be shared on request, as long as your project is active.
I have never done anything in HTML5 and canvas, and JavaScript was years and years ago, until I started this. Thank you, Mark Erickson, for your code example. I learned a lot from it.
https://stackoverflow.com/questions/23451267/how-to-make-drawing-draggable-on-canvas-in-html5