hills near the boundary of the view

[DanielBruegmann]

wrap around graphics or slightly move the view? wrap around graphics could make ant movement look nicer, too (not sure if one can tell, one might if there would be interpolation between ticks)

[PascalCremer]

wrap around graphics could be misinterpreted as two units instead of one. For hills this is different. Movable view by Keyboard with zoom should be a long term goal.