Allow rotating the map from the GUI

[sleske]

Navit can rotate the map which it displays. This is used for rotating the map in the direction of movement during navigation (if "northing" is disabled) - but there's no way for the user to rotate the map manually using the GUI.

There used to be code in Navit to enable map rotation via the mouse (introduced in ​rev. 1856) however it had a problematic UI (see below) and had always been commented out, so I removed it (​rev. 5252)).

I'm entering this feature request so this piece of code is not forgotten. If someone feels a way to rotate the map from the GUI would be useful, please comment here, and maybe someone will feel like implementing / completing this feature.

Problems with the removed implementation:

• Dragging the map both moves and rotates it - this makes it difficult to only drag or only rotate, and is rather confusing for the user. This is made worse by the fact that most of the time users only want to drag, so rotation gets in the way.
• While there is visual feedback for the map movement during dragging, there is no feedback for the rotation part. This makes the experience even more confusing: During dragging the map only seems to move, but once you release, it also rotates.

We'd probably need some way to switch between moving and rotating the map, but I'm not sure about the best UI.

[usul]

Can you please give us more details on your scenario and why you request this feature? I think I never saw such feature on any other navigtion too (but that doesn't matter). Also please give us ideas, how we can realize an appropriate control? (amybe a joggdial or slider?)

[sleske]

Since in over two years no one has expressed any interest in this feature, it's probably not worth it. Closing.