Op 30-3-2012 12:17, Pierpaolo Bernardi schreef:
On Fri, Mar 30, 2012 at 11:53, Roelof Wobben<r.wob...@home.nl> wrote:
Op 30-3-2012 9:46, Pierpaolo Bernardi schreef:
Hello Roelof,
On Fri, Mar 30, 2012 at 09:32, Roelof Wobben<r.wob...@home.nl> wrote:
(define (show-ufo ufo)
(place-image BLU (ufo-loc u) MTS))
But still I can't get the show-ufo work.
Check carefully the name of your variables!
Doesn't DrRacket give you an explicative error message in this case?
P.
Oke, I will do that.
Yes, The error that variable u is not known.
I didn't want to tease you. I thought that you would see it if I
pointed you at it. 8^)
(define (show-ufo ufo)
(place-image BLU (ufo-loc u) MTS))
See that the variables ufo and u should actually the same variable.
So, either you rename u to ufo, or rename ufo to u.
There may be other errors, I have not checked further.
Cheers
P.
Roelof
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Are you sure ?
I thought that the position of the ufo can be find at (posn-y p) and
(posn-x) because the postition is a struct of Posn.
Roelof
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