Zooming

Problem:

In a scene with varying numbers of levels it is possible to forget what zoom level you are on and become lost.

Rationale: 

Some method of knowing how "deep" you are could be helpful, thus a physical indicator in the UI that shows/controls zoom level is a good idea.  Often this is optimal for very large/deep scenes such as a map.

Variants:

• Simple slider in the UI to indicate zoom level. 
• Another variant allows the user to control the zoom level with the slider.
  

Known Uses:

Google Maps has a UI Slider that both indicates and controls zoom level, zooming the scene around the center of the screen.

Bing Maps has a UI Slider that both indicates and controls zoom level and provides hot links to various useful zoom level.

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