Re: gamegrid.el and some games

[Oliver Scholz <alkibiades@gmx.de>]

Miles Bader <miles@lsi.nec.co.jp> writes:

> Oliver Scholz <alkibiades@gmx.de> writes:
>> I know nothing about graphical black&white displays. I assume -- but
>> this is just a wild guess -- that on such a display _every_ coloured
>> pixel appears as black.
>
> I'm not sure what that means.  On a B&W display, there are two colors,
> black, and white.
>
> If you ignore the fact that you're on a B&W display, and try to use
> _other_ colors, then Gerd says it will try to pick the `nearest'
> supported color instead; I guess this means that `dark looking' colors
> will show up as black, and `light looking' colors will show up as
> white.  For pictures this will probably end up looking awful, but for
> simple high-contrast stuff, it may work quite well.

I was thinking  of the tiles that gamegrid provides  and that are used
by pong, tetris and snake. They are _low_ contrast. I am afraid -- but
I have  not made sure -- that  they would appear as  black squares (or
maybe white squares in case of light colours as yellow, for example).

[using ascii on b/w-displays]
>
> That seems unnecessarily conservative, but whatever, you're doing the work...
[...]

Now that I know that the XPM format allows to specify what to do with
the image in such cases, I prefer to use this mechanism. In fact, it
seems that the differences between colour, grayscale and b/w displays
were a part of the reasons to invent XPM. 

It is easy to change the image `gamegrid-xpm' accordingly. (It may not
be so easy to make sure that gamegrid uses this, but it seems like the
Right Thing (tm) and I find it challenging to implement it.)

    -- Oliver

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