Subject:
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Re: #define-ing stuff for Chibots
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Newsgroups:
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lugnet.org.us.laflrc
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Date:
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Sat, 8 Oct 2005 18:51:26 GMT
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Viewed:
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1331 times
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In lugnet.org.us.laflrc, Steve Hassenplug wrote:
> Talking about Chibots Maze event, Davis, Brian L. wrote:
>
> > Oh, and of course the real kicker for event day - I'm developing on a black maze
> > on white background, flagging everything that should matter to make a "negative
> > copy" of the software for later. Ugh.
>
> I'm not totally sure about this, but try playing around with #define
>
> In one language I use, the compiler will totally take out the variable, and put in
> the defined value, before compiling the program. I assume that's how it should work
> in C and NQC.
>
> So, you can do this:
>
>
> ---
> #define UseColor >
> // '>' is black line
> // '<' is white line
>
> ...
>
> if (s1 UseColor threshold1)
> {
> // s1 is on line
> }
> else
> {
> // s1 is off line
> }
Or a different way
#define BLACKLINE 1
#if BLACKLINE
#define SEELINE(reading,threshold) reading < threshold
#else
#define SEELINE(reading,threshold) reading > threshold
#endif
if (SEELINE(s1,threshold1)) {
// s1 is on the line
} else {
// s1 is off the line
}
This way is what I see done by my coworkers and myself at work. By
encapselating the entire comparison in the macro, then the macro name helps make
the code more self documenting.
You simply change the #define of BLACKLINE to 0 instead of 1 for white lines on
black background.
Kev
> ----
>
> > What is the maximum incline in the advanced maze? I've got the sensor head
> > pivoting now, and I think ground clearence will be OK, but we'll see.
>
> For Chibots advanced line, they usually have a hump that's about 2 inches high, in
> the middle, and 6 to 8 inches long.
>
> Steve
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Message is in Reply To:
 | | #define-ing stuff for Chibots
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| (...) I'm not totally sure about this, but try playing around with #define In one language I use, the compiler will totally take out the variable, and put in the defined value, before compiling the program. I assume that's how it should work in C (...) (19 years ago, 3-Oct-05, to lugnet.org.us.laflrc)
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