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#1
February 27th, 2007, 10:43 PM
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Trapezoid 2d Affine Transform
Hi,
I'm trying to get an affine transform that will turn a square image into a trapezoid like this: original Code:
+----+ | | | | +----+ transformed Code:
+--+ / \ / \ +--------+ I understand that the transform matrix has a row for each axis and that each axis has a scale and a skew, but that's about it. Sometimes the numbers get together behind the scenes and hold a seance where they do inexplicable things like boil frogs and rotate entire images. So if there's a good resource on that, I'd like to know about it. Thanks for any help Neal
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#2
February 27th, 2007, 11:02 PM
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Here is the matrix for 2D transformations:
1 2 3 4 5 6 7 8 9 You will want to mess with values 7 and 8. They are usually 0. EDIT: I agree matrixes are magical in nature at first, but after you use them long enough then they loose their magic and gain ingenuity.
__________________
There are none so blind as those who will not see. — Jonathan Swift My 2D Physics Engine. My Remake of UQM. Both are written in C#. Last edited by BioSlayer : February 27th, 2007 at 11:06 PM.
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#3
February 27th, 2007, 11:47 PM
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Do you know how to do it in Java? It looks to me like they don't want you playing with the bottom row.
Here's the javadoc for AffineTransform
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#4
February 28th, 2007, 01:10 AM
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You might be confused here: an affine transformation can never map a square to a trapezoid, only to a parallelogram. What you really want is a projective transformation.
Some background.
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#5
February 28th, 2007, 02:44 AM
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Quote:
Since that bottom row is implied (not really there) you can't do what you want.
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