Multiple users draw simultaneous

[neoneye]

Until 9mar2021 the TriangleDraw app have assumed that it's just a single user interacting with the app.

I have noticed when multiple kids are interacting with an iPad, they try to draw at the same time.

When multiple kids are touching the screen it causes major havoc. Two kids drawing at the same time may be interpreted as a pinch to zoom gesture. It freaks out the gesture recognizer code. So the drawing is not happening, causing confusion for the kids.

Allowing for multiple users to draw may complicate the UI. Two finger gestures are not possible, so this impacts zoom and scroll.

• Pinch to zoom will not be possible.
• Scrolling will not be possible.

Perhaps introduce a lock/unlock button, that toggles two finger gestures.