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안녕하세요.^^/ 기억하실런지~ 저번에 알려주신 공간검색 알고리즘 문서 잘 보았습니다. 도움 많이 되었어요. 요즘에는 OGC표준안에 맞춰서 Geometry를 구성해보고 있는데 알고리즘 게시판이 도움이 많이 되고 있습니다.^^ 올려주신 프로그램과 글을 보고 헷갈리던게 많이 해소됐어요~ 그런데 글을 보다가 궁금한게 생겨서요! Buffer라는 것인데, 이게 크기를 늘리는 것 같긴 한데 똑같이 늘어나는건 아니고 좀 둥글둥글하게 늘어나더라구요. 이게 어떤 함수인지 궁금해서 표준안을 봤더니 해당 기하의 경계에서 일정거리만큼 떨어져 있는 점들의 집합을 기하로 리턴하는 거더라구요. 근데 한 점에서 일정거리로 떨어진 점의 집합은 원이잖아요? 경계는 많은 점들로 구성되어 있는데, 일일이 그 각각의 점들로부터 떨어진 원들을 구해서 그 원들의 합집합이 리턴되는건가요? 이 Buffer라는 함수가 어떤 알고리즘으로 구현되는지 궁금합니다~ 간략하게나마 설명해주실 수 없을까요?

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글로 설명하기가 참 애매합니다만... 일단 기본 개념은 원(Circle)에 의한 확장이나 축소입니다. ^^; 그러니깐.. 구성 좌표에서 늘이거나 줄일 만큼의 거리값(원의 반지름)으로 원을 구성하고.. 이 구성된 원들을 연결해주는 방식입니다.... 기본은 이렇답니다.

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