On Sun Apr 22, 2007, Viktoras Didziulis viktoras at ekoinf.net wrote:
Is there a "standard" method of setting irregularly shaped invisible
hotspots on images displayed on a stack ?
I have a few images with lots of fish on them. Need to highlight each fish
and display its name on mouseEnter. Now I am drawing a polygon around each
fish, setting its tool tip to fish name and putting a script that
passes the
long id of the polygon to a handler to change polygon's ink from noop to
blend. And vice versa on mouseLeave. Additionally it displays contents of
polygon's tooltip in a separate field (in case the tooltip does not appear
immediately on mousenter).
The drawback of this approach is that while highlights are irregular,
hotspots are still rectangular and sometimes hotspot of a large fish
blocks
all the small fishes around. So I have to adjust ordering of polygons
sending larger to back and bringing the smallest to front to avoid
blocking.
Are there other alternative techniques ?
Best!
Viktoras
Your approach should indeed work even with older versions of Rev and
Metacard, I just tested in Rev 2.6.1 and Metacard 2.6.6.
The rectangle of the irregular graphic is *not* relevant, only the
(filled) shape of the graphic will trigger the tooltip.
An alternative approach would be not to use tooltips, but to name the
graphics and to show and hide the names on mouseenter and mouseleave. I
have implemented a similar way in stack "Image and Words"
(<http://www.sanke.org/Software/ImageAndWords.zip>), created a couple of
years ago.
Regards,
Wilhelm Sanke
<http://www.sanke.org/MetaMedia>
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