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PORotating Multi-Dimensional Arrays
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2012-07-04T16:00:38.110
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2012-07-05T02:57:23.400
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2012-07-05T02:57:23.400
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So I want to compare one 2-dimensional array with another 2-dimensional array (acctually portion of another larger 2-dimensional arrays). What I need to do is to compare the first array with the second, but I also need to compare it from multiple angles, rotating one of them if you will. I'm writing this in c++ and I'm using vectors (in case there is a specific algorithm or function for these that would help) Here's an example of what I need to be able to do with this: <pre><code>Take this map: 0001000 0001000 0001000 0001111 0000000 Compare it to this (which means if 1 is road and 0 is grass, this would help me find 'turns' in the road): 010 110 000 Comparing it like that won't yield any results, BUT, if I rotate it to 180 degrees: 010 011 000 It fits. </code></pre> More specifally I will compare a whole bunch of small arrays to the large array. I will not compare every location on the large array, only pick a location at random and a small array at random, rotate the small array to all 4 sides and see if they match. I will repeat this a few hundred times to find a decent sample of locations where a random selected sample of small maps compare positively to the large map. Basically... :) Atm I'm trying to figure it out, but I don't want to reinvent a wheel if I can help it. (UPDATE: Close to solving this! I realised that I acctually need to rotate the lesser grid 8 times, I need to match every mirror! UPDATE2: lol I solved it wtf. Will post as soon as I understand what the code acctually does, might as well. 5 AM I'm crazy like this!)
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<multidimensional-array>
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Rotating Multi-Dimensional Arrays
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