New answers tagged cocos2d
It looks like it is probably based on curves - like maybe piecewise Bezier curves, or maybe B-splines. Internally in the code they could also be using hermite splines, catmul-rom splines or some other variant but without seeing the code its nearly impossible to tell what specific curve is being used since many of the above are visually equivalent, but are ...
Maybe you forgot to preload the tileset image? Besides preloading "res/farm.tmx", you may have to preload, say, "res/farm.png". I had the same problem, and that solved it for me.
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