Improve navigation for mind maps

[BenHerbst]

I can easily navigate via arrow keys, but on big projects, things get more complicated...
Zooming doesnt works that well, i always end up being at an other position instead of the one I wanted to be.

How to improve this:

• Move around via mouse pressed scroll wheel and moving mouse ( like in Minder, Godot, Blender )
• Zoom first collects the current mouse position, then just moves to that one until user presses other key then zoom
• Smooth zoom
• Smooth movement

[swiftech]

I'm afraid the performance is hard to improve for drawing on Swing canvas, especially the case you have many topics in a map.

[BenHerbst]

But please implement moving around via middle mouse press, every app has that, also some swing ones like Geogebra 4

[swiftech]

@BenHerbst try https://github.com/mindolph/Mindolph, should be better

[raydac]

@swiftech I don't see any sources of that project