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Editorial Team
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Asked: 2026-05-18T21:29:50+00:00

Very simple math question. Say I have an image with a point being tracked

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Very simple math question.

Say I have an image with a point being tracked in it. Here are my variables:

Image Height
Image Width
Point (pixles from left) coordinate X
Point (pixles from top) coordinate Y

For example the width, I want it to return a value of -0.5, which represents the distance from the center, such that 1 would be the total right, and -1 would be the total left.

So, how would I calculate so that

The point was (width) a quarter way across the entire frame, or a half way across the left SIDE of the frame. The variables would equal:

Image width: 40
Point X: 10

I know this is basic, but I seriously am having a mind cramp right now O_o.

Thanks,
Christian

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1 Answer

  1. Editorial Team
    Xnew = 2*X/Width - 1
Ynew = 2*Y/Height - 1

    Explanation:

    X/Width gives you value from 0 (total left) to 1 (total right). 2*X/Width then gives a value from 0 (total left) to 2 (total right). Subtract 1 to get a value from -1 (total left) to 1 (total right).

    The same for Y.

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