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Asked: 2026-06-05T05:12:53+00:00

I assume this is would be a basic question however, my math skills are

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I assume this is would be a basic question however, my math skills are lacking.

I am working on an iphone game where people draw their own platform to bounce an egg up.

The game consists of a platform connecting 2 nodes each of these nodes has an x and y value this platform can be at any angle depending on how the user draws it, when something hits this platform I need it to hit off perpendicularly. I know how much total power I need, how would I break it down between X and Y. I drew a picture to better explain…

Two examples of my problem each for a different direction

Here are two examples the info I have about the problem is the X & Y coordinate of the nodes, and the length of the dotted perpendicular line. What I need to find is the length of the X and Y lines and if the X is going in a positive or negative direction.

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1 Answer

  1. Editorial Team

    If you have two nodes, N1 and N2, and line length of L, then:

    ndx = N1.x - N2.x
ndy = N1.y - N2.y
ndist = sqrt(ndx*ndx + ndy*ndy)
x = ndy * L / ndist
y = ndx * L / ndist
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