American Foundation for the Blind York City headquarters. Louis Braille was the Frenchman who invented the raised dot code that bears his name. On January 4, 2009, the 200th anniversary of his birth, AFB created an online gallery that includes pictures of him and digitized books and articles. AFB's main headquarters is in Arlington, Virginia. Other offices include New York City; Dallas, Texas; and Huntington, West Virginia. In 2012, AFB added VisionAware to its family of sites in partnership with the "Reader's Digest" Partners for Sight Foundation. The site folded in content from AFB's Senior Site, with new information and resources for adults of all
Point in polygon polygon overlaps itself. The point in polygon problem may be considered in the general repeated geometric query setting: given a single polygon and a sequence of query points, quickly find the answers for each query point. Clearly, any of the general approaches for planar point location may be used. Simpler solutions are available for some special polygons. Simpler algorithms are possible for monotone polygons, star-shaped polygons, convex polygons and triangles. The triangle case can be solved easily by use of a barycentric coordinate system, parametric equation or dot product. The dot product method extends naturally to any convex polygon. Point