Scratch Pad

[MartinSpasov]

Implement a scratch pad on which students can join and solve problems together real time.

• Draw on white board using mouse
• Have multiple color pens
• Ability to erase what was drawn
• Possibility to save the scratch pad and reuse it, if to complicated save it as an image and store it within the file system

• Can use a library for this if any are available for free

[simon-bourque]

For front end this should be no problem to implement (just use <canvas>) the main issue would be figuring out an effecient way to synch everyones canvases.

I was thinking everytime someone draws a new line segment, it sends that back to the server and replicates it back to everyone else. Doing it this way would avoid us having to send the canvas's buffer everytime something new is drawn. The only issue is that if someone wasnt connected at the time the line was drawn they wont see it drawn. Does anyone have any ideas of how we could solve this? perhaps send the whole buffer when someone connects and then after that only send new line segments?

[MartinSpasov]

Great Idea @simon-bourque