참고 사이트 [충돌처리때문에 검색하다가]

https://www.raywenderlich.com/15230/how-to-make-a-platform-game-like-super-mario-brothers-part-1

https://www.raywenderlich.com/15267/how-to-make-a-platform-game-like-super-mario-brothers-part-2

https://www.raywenderlich.com/29458/how-to-make-a-tile-based-game-with-cocos2d-2-x

http://info.sonicretro.org/SPG:Solid_Tiles

http://higherorderfun.com/blog/2012/05/20/the-guide-to-implementing-2d-platformers/

http://www.metanetsoftware.com/technique/tutorialA.html

https://wildbunny.co.uk/blog/2011/12/14/how-to-make-a-2d-platform-game-part-2-collision-detection/

https://wildbunny.co.uk/blog/2011/03/25/speculative-contacts-an-continuous-collision-engine-approach-part-1/