best way to define clickable areas with irregular shapes ?

[Eric Chatonet]

Hi JB,

As png images with transparency (alpha channel) receive mouse  
messages only in non transparent areas, here is a way to do the trick:
Open your original image in PhotoShop or any image editor you use and  
erase all non hotspots places then save this modified image as a png.
Hotspots are now very precise :-)
Put both images onto a card, the modified one on top:
Now mousedowns, mouseUps, etc. will only bee sent when done in hot  
spots.
If you have many hot spots, you can ensure the process by adding  
rough invisible graphics including each hotspot and test in addition  
in which graphic the mouse is within.
Note that you can set the blendlevel of the modified image to 100, it  
will be invisible but all will go on to work :-)

Le 25 mai 07 à 15:21, jbv a écrit :

>
> What is the best way to define clickable maps / areas with irregular
> shapes
> on a large background image ?
> I've tried transparent graphics, and also a "mousemove" handler in the
> card
> script, but nothing seems to work really well...
>
> thanks,
> JB

Best regards from Paris,
Eric Chatonet.
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