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Index › Discussion › Exhibition › Projection of rotating shapes.
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Projection of rotating shapes. (Read 1132 times)
Bejoscha
Projection of rotating shapes.
Mar 2nd, 2010, 10:31am  
Just another little sketch (my second). I was interested in plotting the "shadow" of a 2D-shape as a function of rotation.

ProjectionPlot
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yconst
Re: Projection of rotating shapes.
Reply #1 - Mar 2nd, 2010, 10:47am  
Interesting.

does it work for convex shapes or any shape at all?

have you or do you plan on releasing the source?
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Yiannis Chatzikonstantinou
volatile prototypes
 
Bejoscha
Re: Projection of rotating shapes.
Reply #2 - Mar 3rd, 2010, 1:25am  
Hi, it does only work with straight lines for the vertices, as the algorithm is rather simple. For each rotation find the x-value of the left-most vertex and the right-most vertex, which - under the constraint of straight lines connecting the vertices - should give you the "maxium width" as if projected from top (or bottom).
If you're interested in the code, I can share it, but it was too messy at the moment to put it online right away. (All my projects "grow" and quite often unneccessary leftovers make it bigger than nieeded etc.)
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Bejoscha
Re: Projection of rotating shapes.
Reply #3 - Mar 3rd, 2010, 5:25am  
I've put the code online at http://www.openprocessing.org/visuals/?visualID=8022 now.
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