National Center for Biotechnology Information (NCBI)

National Library of Medicine (NLM)

Indicates the coordinates that define a hot spot location on an image map for a graphic

Each hot spot shape requires a slightly different set of coordinates. All coordinates are relative
to `0,0`, which is the upper left corner of the
graphic. Coordinate numbers are listed in the order described below, without parentheses, with
commas between the numbers:

- For a rectangle,
this attribute holds the (x,y) coordinates for the top left
followed by the (x,y) coordinates for the bottom right of the rectangle. For example, the x1,y1,x2,y2
for one rectangle could be:
“
`67,178,132,205`” - For a
circle, this attribute holds the (x,y) coordinates of the center of the circle, and the radius value,
for example, “
`67,178,40`” - For any other regular polygon, this attribute holds the (x,y) coordinates of each corner, clockwise from the top left point.