[TUTORIAL] Getting Hit Position from testSegment

[Kuromeku]

I struggled at first, and then I found this:

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http://www.box2d.org/wiki/index.php?title=TestSegment

This link basically says that to find the point of intersection, you do:

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b2Vec2 intersectionPoint = (1 - lambda) * segment.p1 + lambda * segment.p2;

Where 'lambda' is the impactTime and where the 'segment' values are both vectors.

To do this tutorial correctly you'll either want to use kudoLib (LÖVE Library)'s vector library or the one that comes with ËNVY (LÖVE Framework).

ËNVY (LÖVE Framework): http://love2d.org/forum/viewtopic.php?f=5&t=172
kudoLib (LÖVE Library) : http://love2d.org/forum/viewtopic.php?f=5&t=160

Once you have either one of them vector libraries, or you have your own that supports doing arithmetic to vectors, you do the following code.

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local hitPosition = (1 - impactTime) * startVector + impactTime * finishVector;

I hope this helps.