ATn2 from Tools

Re: ATn2() from Tools

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Re: ATn2() from Tools

Author: dlzc
Date: Jun 11, 2008 14:39

Dear AUGE_OHR:

On Jun 11, 10:54 am, "AUGE_OHR" wrote:

> im looking for equivalent to ATn2() from "Tools".
> *** snip ***
> Purpose
>
> Calculates the radiant of an angle from sine
> and cosine
>
> Syntax
>
> Atn2( , ;
> ;
> ) --> nRadiant
>
> *** eof ***
>
> can someone show me how to do it with
> "pure" Cl*pper ?

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3 Comments

Re: ATn2() from Tools

Date: Jun 11, 2008 18:17

hi,

>http://www.the-oasis.net/ftpmaster.php3?content=ftpgenrl.htm
>... down to trig.zip. (I do not know if he chose "ATAN" for the
>name... that is VFP-syntax.)

i have look at the-oasis and found that file but they do not have ATn2().

from German Xbase++ Forum (http://www.xbaseforum.de/) i got:

*** snip ***
FUNCTION ATN2(nSin,nCos)
LOCAL nPi := PI()
LOCAL nAngle := 0

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Re: ATn2() from Tools

Date: Jun 11, 2008 18:26

hi,

i just saw a small differenz

my:

> nAngle:=nPi-aTan(nSin/-nCos)

your:

> RETURN PI() + ATAN(delta_y/delta_x)

hm ... i will test it again
... both give me same result ... funny

greetings by OHR
Jimmy

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Re: ATn2() from Tools

Author: N:dlzc D:aol T:com (dlzc)
Date: Jun 12, 2008 06:10

Dear AUGE_OHR:

"AUGE_OHR" wrote in message
news:g2q6p2$5g6$00$1@news.t-online.com...
...

> my:

>> nAngle:=nPi-aTan(nSin/-nCos)

Note the minus sign inside the aTan() function, in the
denominator.

> your:

>> RETURN PI() + ATAN(delta_y/delta_x)

>
> hm ... i will test it again
> ... both give me same result ... funny

No need. Roughly, 1 = -1 * ( -1 ). Trig can be a sneaky
ba*tard.

David A.Smith

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