Finding outline of connected rectangles

Comments

• totebo Member

  February 2016

  I've now managed to get all the points of the outline, but they're in random order. Next step would be to order them in clockwise order to draw the shape. Still listening for other solutions!

  My Gideros games: www.totebo.com

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• SinisterSoft Maintainer

  February 2016

  With that kind of complex shape, it might be faster for box2d to process collision with them as the 4 boxes rather than the new shape?

  Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
  https://deluxepixel.com

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• antix Member

  February 2016

  Will their edges overlap at any stage or will they just touch edges?

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• totebo Member

  February 2016

  @sinistersoft: The boxes are individual objects in Box2D already, I'm just looking to fill the "cookie cutter" holes (actually a road) with a background that tiles nicely.
  
  @antix: The edges should never overlap, but I find that the conversion from Rube sometimes isn't as exact as I'd like, so there are small overlaps sometimes.
  
  In other news, I miraculously managed to find Lua code to sort the points clockwise. Initial tests appear to indicate it works! Code here: http://stackoverflow.com/Questions/6989100/sort-points-in-clockwise-order
  
  

  My Gideros games: www.totebo.com

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• totebo Member

  February 2016

  Short lived happiness: The sorting doesn't seem to handle concave cases. Time for bed.

  My Gideros games: www.totebo.com

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• totebo Member

  February 2016

  Wow. I got it to work, but it makes no sense. I fill each individual rectangle with a shape with a tiled pattern. For some reason it tiles perfectly, even though the rectangles (and therefore shapes) are in arbitrary places. I shall accept this magic and move on.

  My Gideros games: www.totebo.com

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• antix Member

  February 2016

  @totebo, dang
  
  Generally most systems breakdown concave shapes into multiple convex ones for processing (or so it seems).

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• antix Member

  February 2016 edited February 2016

  Wow. I got it to work, but it makes no sense. I fill each individual rectangle with a shape with a tiled pattern. For some reason it tiles perfectly, even though the rectangles (and therefore shapes) are in arbitrary places. I shall accept this magic and move on.

  Thats how shapes work. If you set your tiling pattern it automatically does that

  Likes: totebo

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• totebo Member

  February 2016 edited February 2016

  Incredible. I'll stop this rebuilding the wheel nonsense, then.

  My Gideros games: www.totebo.com

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