Your list of links is missing my favorite Web site.
Answer
We would be pleased to add your favorite site to our Web links
if it fits into one of the general categories of interest to users
of The Compleat Botanica.
Mouse algorithmHover polygon shapesDetecting irregularDetecting Mouse Hover over Irregular Shapes W. Randolph Franklin's "point inclusion in polygon test" algorithm weighs in at just seven lines of C code; is fast enough to work with sophisticated GIS datasets; and is one of those gems that every advanced programmer should know.