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Dwood15
 Post subject: Calculate angles with Java
PostPosted: Sat May 30, 2009 5:52 pm 
Northwood
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Joined: Sun Jul 15, 2007 6:37 pm
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Hey, I'm doing a simple trajectory calculation in Java and it seems that the Math.sin method is giving me a negative number. Not only that but the number i'm looking for is all wrong.
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xxmainframexpxx
 Post subject: Re: Calculate angles with Java
PostPosted: Sat May 30, 2009 6:16 pm 
Little Foot
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Joined: Sat Feb 11, 2006 11:04 am
Posts: 174
Dwood15 wrote:
Hey, I'm doing a simple trajectory calculation in Java and it seems that the Math.sin method is giving me a negative number. Not only that but the number i'm looking for is all wrong.


maybe your algorithm is wrong. Post your code here for people can see it.
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Quertior
 Post subject:
PostPosted: Sat May 30, 2009 6:23 pm 
Little Foot
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Also remember that all Java's trig functions work in radians. If you're doing degrees, then it won't work.
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Dwood15
 Post subject:
PostPosted: Sat May 30, 2009 6:49 pm 
Northwood
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Quertior wrote:
Also remember that all Java's trig functions work in radians. If you're doing degrees, then it won't work.


it's just Math.sin(angle) so how do I get it into degrees? Math.toDegrees();?
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Quertior
 Post subject:
PostPosted: Sat May 30, 2009 8:00 pm 
Little Foot
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Dwood15 wrote:
it's just Math.sin(angle) so how do I get it into degrees? Math.toDegrees();?


Wait, let me clarify. Math.sin() will NOT work correctly with an angle in degrees. If you are using radians, you should be FINE.

However, if not:
Code:
double angleInDegrees = /*some angle in degrees*/ ;
double sineOfAngle = Math.sin(Math.toRadians(angleInDegrees));

Hope that helps.
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