Re: Irregularly shaped hotspots on image

[Wilhelm Sanke]

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" 
(), created a couple of 
years ago.


Regards,

Wilhelm Sanke


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Re: Irregularly shaped hotspots on image

[Scott Rossi]

Recently, Viktoras Didziulis 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 ?

What version of Rev are you using?  If I understand what you're doing, the
technique you describe *should* work in Rev 2.7 and later because mouse
detection in graphic objects was changed to use the real pixels occupied by
the graphics, as opposed to their rects.

If you're using Rev 2.6, you'll need to use images that contain transparency
to define your hotspots (PNG or GIF) as the mouse will be detected on the
non-transparent pixels.

Regards,

Scott Rossi
Creative Director
Tactile Media, Multimedia & Design


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Irregularly shaped hotspots on image

[Viktoras Didziulis]

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
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