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44

answers:

1
+2  Q: 

How do i map points from one grid to another?

+3  A: 

You might want to read up on Affine transformations. There isn't much magic going on here, just a little translation and shearing. This is all done just with a matrix multiplication for the coordinate pairs (in homogenous coordinates), so it's very easy to do. But can be a little hard to understand :-)

Joey  2009-10-25 10:14:24
It's quite possible that the deformed points could be in extremely unusual configurations, will it work for those cases? (such as the lower right point being very close to and/or on the other side of the upper left)
RCIX  2009-10-25 10:26:55
Well, as long as you can represent it with scaling, shearing, rotation, it should be possible. Also there are perspective transformations which are a little harder to calculate but have pretty much the same underlying mathematics.
Joey  2009-10-25 10:29:10

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