Convert arbitrary length to a value between -1.0 a 1.0?

Posted by TheDarkIn1978 on Stack Overflow See other posts from Stack Overflow or by TheDarkIn1978
Published on 2010-06-18T03:23:26Z Indexed on 2010/06/18 3:43 UTC
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math

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convert

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range

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length

How can I convert a length into a value in the range -1.0 to 1.0?

Example: my stage is 440px in length and accepts mouse events. I would like to click in the middle of the stage, and rather than an output of X = 220, I'd like it to be X = 0. Similarly, I'd like the real X = 0 to become X = -1.0 and the real X = 440 to become X = 1.0.

I don't have access to the stage, so i can't simply center-register it, which would make this process a lot easier. Also, it's not possible to dynamically change the actual size of my stage, so I'm looking for a formula that will translate the mouse's real X coordinate of the stage to evenly fit within a range from -1 to 1.

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