7.6 MAP Element
Netscape, Microsoft (Version 2.0 and later) and Spyglass browsers all
support the client-side image map element MAP. MAP specifies the
regions of a mapped image and the associated URLs within a structure
of the form:
<MAP NAME="string" >
<AREA SHAPE="rect" COORDS="x1, y1, x2, y2" HREF="url_for_region">
..... more shapes ...
</MAP>
where (x1,y1) are the upper-left hand coordinates and (x2,y2) the lower
right-hand coordinates for the rectangle. Other possible shapes are
<AREA SHAPE="circle" COORDS="x1, y1, r" HREF="url_for_region">
<AREA SHAPE="polygon" COORDS="x1, y1, x2, y2 ... xn, yn" HREF="url_for_region">
With the circle, (x1,y1) is the center and r is the radius. All
coordinates are in pixels.
According to
the spec, you should be able to specify SHAPE="circle" giving two
point cordinates: the ecenter and an edge, using the form
COORDS="x1, y1, x2, y2". This form, however, does not work.
7.6.1 Referencing the MAP
You reference the map from within an IMG element using the new USEMAP
attribute. For example:
<IMG SRC="blobby.gif" USEMAP="#string">
references the map named "string" listed above. YOu could also put
an ISMAP inside this IMG element, and surround the IMG by an anchor
pointing to a server=side imagemap program -- if the browesr understands
USEMAP it will ignore the ISMAP and use the client-side map found in
the MAP element. If it does not understand USEMAP it will default
to the regular behaviour.
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© Ian Graham 1994-1995
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Page Last Updated: 16 July 1996
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