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In graphics applications there is often a feature that allows one to flip or mirror objects like images or shapes around the horizontal or vertical axis.

In an application I use the action will be labled and work like this:

  • Flip horizontal: Flip around the vertical axis.
  • Flip vertical: Flip around the horizontal axis.

So my question is, why is this inverted? I think I can remember that I saw it the other way round at least once. But I am not sure if there was additional information that they were referring to the axes.

Is it obvious what is going to happen when the user chooses either of the options (without an additional icon or text)?

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up vote 3 down vote accepted

I would say the way you have it set up is the expected and natural experience. Users likely will not be thinking about which axis the object is rotating around, instead which direction the object itself will be rotating/flipping.

Take Flipboard, for example. Swiping left or right technically flips the cover around the vertical axis, but the user sees the cover being flipped left or right, i.e. horizontally.

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Exactly, it is easier for the general user to think of the direction something is flipping, rather than how it works on an axis. If you try and imagine other ways of saying the same thing, i.e. flip up, flip over, flip tall etc, horizontal and vertical seem to equate to the best user experience. –  Brad Hutchison Mar 2 '12 at 15:41
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Yep, agreed. Photoshop, for example, uses "Flip horizontal" and "Flip vertical" as the original poster, while Illustrator uses "Refelct along axis". I'm using both on a regular basis, and Illustrator's behaviour is just unnatural, I get the axis wrong every now and then and it is very, very annoying. –  Christian Mar 2 '12 at 19:05
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