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How do I recognize patterns (like in TwoDots)?

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Hi guys,


I am new here, so I hope that's the right part of the forum.


I currently working on a "small" mobile game. Not a clone of TwoDots(!) but I need to recognize patterns like they do. I can think of several ways to do it, but none of them are actually really smart... especially when it comes to non-squares/rectangles.




My idea was to store the players touch directions. For the blue square this would mean {1,2,3,4} if you start bottom left and move counterclockwise. Then I could simply check the number of elements in the array (=4). 4 means a possible square and if all numbers are different it is a square. To simplify this I could just check if the start- and end-dots ([3|3] = [3|3]) are the same and if there are 4 elements in the array it is a square.


The problems start with the purple square. Starting bottom left and counterclockwise again there would be the following sequence {1,1,1,2,2,2,3,3,3,4,4,4}. If start- and end-dots are the same there might be an rectangle/square. But what do I do now? I can count all numbers (3x1, 3x2, 3x3, 3x4) and see that all numbers appear 3 times. But sadly that doesn't qualify for a square because [1,2,1,2,1,2,3,3,3,4,4,4] would also close the pattern but is not a square. To solve this I could divide the sequence by numbers {[111],[222],[333],[444]} and if all appear equally then I have a square. To check for rectangle I can just count opposite sites. If 1 and 3 appear equally and same goes for 2 and 4 then I have a rectangle or square.


Well... the green one really makes my brain hurt because I want to know if the pattern encloses any dots. Green is definitely not a rectangle nor a square. I know that there might be any dots enclosed because there are more than 4 elements stored in the array and the start- and end-dot are the same but how do I get the three question marks? Same goes for the blue dots which are enclosed by the purple square.


I am totally lost at the green question marks and I don't think that my approach for the blue and purple square are the best solution. It would be great if someone had an advice for me.




Edited by Proudcastle

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