A silly little question about orbit and years

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Daryn Alsup

16

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Joined: 5th Jul 2008

Location: In your head... dun dun DUN!!!!!!!!

Posted: 27th Feb 2010 00:25

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I have an object orbiting another. Every time it completes a full orbit, how would I increment a year value. now I have tried the

+ Code Snippet

If int(Angle#)=>358
Year=Year+1
endif

method, but because the angle is a float (So the object rotation appears smooth) the remaining values, or 359.01... up to 359.99999 bar cause the year value to increment more then it should. So I am really looking for a way to increment a year value via some form of equation related to orbit rather than a process such as the one above. Any ideas or help is greatly appreciated.

-D

Jack and Jill went up a hill to fetch a pale of water... but Jill got tired of his s#%& so she shot him.

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D Ogre

21

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Joined: 19th Nov 2003

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Posted: 27th Feb 2010 06:03

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Are you limiting the range of Angle# from 0 to 360 degrees somewhere in your code?
Otherwise any values beyond what your checking will increment the year continuously..

Example:

+ Code Snippet

Angle# = 0.0
Year = 0

Do
   Cls
   Angle# = Angle# + 0.05

   If Angle# >= 360.0
      Year = year + 1 : Angle# = 0.0
   EndIf

   Print Angle#
   Print Year
Loop

I would normally suggest using the WRAPVALUE() function to limit the range to within
360 degrees, but for some reason it was acting quite strangely on my internet PC.
So, that is why I my example here doesn't make use of it.

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Rudolpho

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Joined: 28th Dec 2005

Location: Sweden

Posted: 27th Feb 2010 09:51

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In the loop:

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oldAngle# = angle#
angle# = wrapvalue(angle# + angleIncrement#)

` When the angle wraps around (from 360 to 0), the below statement 
` will evaluate to true. In the next loop, oldAngle# will once again 
` be set to a lower value than angle#, which will keep being the case 
` until angle# wraps around again.
if angle# < oldAngle#
   inc year
endif

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D Ogre

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Joined: 19th Nov 2003

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Posted: 28th Feb 2010 04:02

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@ Rudolpho

That was pretty much what I was going to post, but the WRAPVALUE() was causing the year to increment by tens on my internet PC. Very odd behavior. I thought I stumbled on a bug in 7.4. I haven't tried the code again since my last post. Have to look at it again later. Thanks for posting a more preferred way.

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