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Dark GDK / dbATANFULL() Question.

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OceanJeff
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Joined: 5th Jan 2009
Location: Ocean Shores, WA
Posted: 9th Jan 2009 11:45
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Ok, so I'm using dbATANFULL() to figure the angle between two points.

I tried simply sending it this.

dbATANFULL ( x1 - x2, y1 - y2 );

this returned results from -135+ to +100+, or should I say - on the first one...anyways, I didn't get the results 0 to 360...

then I decided maybe it wants the distance, so that should be any negative values.

dbATANFULL ( dbABS ( x1 - x2 ), dbABS ( y1 - y2 ) );

that only returned values from 0 to 90...

HELP, am I missing something here?

looking forward to responses,

jeff


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AndrewT
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Joined: 11th Feb 2007
Location: MI, USA
Posted: 9th Jan 2009 12:32 Edited at: 9th Jan 2009 12:36
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The problem is you're using the absolute value of the distance. Try this code:



It should return values from -180 to 180.


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Matty H
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Location: England
Posted: 9th Jan 2009 18:55
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Give this a try also, Ive remembered it from another thread,
the fact that the second value is opposite sign to what you had makes a difference.

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OceanJeff
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Posted: 9th Jan 2009 21:54
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I'll have to take another look, but the documentation doesn't say that...

thanks,

jeff

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OceanJeff
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Posted: 11th Jan 2009 09:36
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Wow, I found the dbAtanfull() function in the camera demo.

Pretty cool.

I just went ahead and added 180 to the result it gave me, and that works...!!

later all,

jeff

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jason p sage
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Joined: 10th Jun 2007
Location: Ellington, CT USA
Posted: 13th Jan 2009 04:25
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Note that the dbAtanFull is really atan2

dbAtanFull uses degrees

atan2 uses radians to my knowledge.

--jason


http://www.jasonpetersage.com/?PAGE=ironinfantry&SECTION=ironinfantry
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