scratchcard problem

[me2222]

Hi.

I want to code a "scratchcard". Something like this:
http://flashden.net/item/scratch-me-off/34545

No problem...
...but I need to know how much of the area in per cent is being scratched free.

Is this possible?

Any ideas welcome.

Thanks

[samac1068]

Not sure what you're asking. You can use just about any percentage that you see fit. In the example you provided, it looks like 33.3% of the coin dimension is being used for the scratching surface. Also it looks like only the left edge is being recognized. It would have been better if they provided a little more of an angle on the coin to give the appears of the edge scratching the surface.

[me2222]

Thanks for reply.

It's no matter of the shape of the surface being scratched off.

My question was if there is ANY way to calculate the amount of surface that was scratched off.

However, I got an acceptable solution from someone in another flash forum.
He told me to divide the surface into squares that I can use to check if the mouse rolled over yet.

Not very accurate, but better than nothing.

Thanks