map navigation
Widget gallery Zooming
Scrollbar
Almost unreal: scroll to zoom in or out, not to pan around.
Moving the scrollbar from left to right, the map scale smoothly changes, contrary to the established behaviour of the scrollbar widget: to move the view of an area that is too large to be entirely visible in its display region. Vertical scrollbars typically move the map up and down, and horizontal scrollbars move the map left and right within the view. Scroll arrows at either end of the widget cause the view to be shifted incrementally in one direction at a time. The scrollbox (also called a thumb or elevator) allows the user to move to a specific region.
The Theban Mapping Project develops and maintains two atlases: the Atlas of the Valley of the Kings and the Atlas of the Theban Necropolis. The first atlas features a horizontal scrollbar widget, the second atlas features a vertical scrollbar widget. In both cases, the scroll box confusingly enables users to zoom in at the map centre. The scroll arrows incrementally change the zoom factor.
To overcome the confusion, the widget had better be redesigned to take away any similarity to the scrollbar widget that users may experience, for example by using the slider widget instead.