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DarkBASIC Professional Discussion / atanfull for dummies

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adr
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Posted: 15th Jul 2003 14:42
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What does atanfull full do? I mean, I can read the documentation for the function, and I can read up on the maths behind it, but I don't understand in which circumstances it would be useful.

Thanks in advance,
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Fallout
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Posted: 15th Jul 2003 16:04 Edited at: 15th Jul 2003 16:07
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Ok, say you want to figure out what direction your mum is travelling if she starts at x1,y1 and moves to x2,y2 .... you do this ...

AngleOfTravel = atanfull(x2-x1,y2-y1)

And hey presto, you know your mum is travelling in a 45 degree direction, for example.

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adr
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Posted: 15th Jul 2003 16:37
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Don't you be talkin bout my momma

Seriously though - cheers. Sounds like a handy function

Bender:Blackmail’s such an ugly word. I prefer extortion. The x makes it sound cool.
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Philip
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Posted: 15th Jul 2003 17:28
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As I understand it its basically a short cut function that saves having to work out vectors before calculating the angle with asin or acos.

Useful, although in a 3d world you still need to be able to work out what direction your ship is pointing, rather than just the angle.

Phil

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JamesBlond
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Posted: 15th Jul 2003 18:09
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Question: What is the difference between atanfull and atan?
I can only see two differences, the spelling and instead of writing "," you write "/" ( ie. angle=atan(4/2)=atanfull(4,2)=63.4349 ).

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IanM
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Posted: 15th Jul 2003 20:39
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They're not the same. Using ATAN() in that way only gives you angles from -90 to +90, where ATANFULL() gives you a full 360 degree range of -180 to +180.

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Fallout
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Posted: 16th Jul 2003 01:38
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I HATE THE 360 degree turn left right threshhold barrier thing thing thing. For example, if I'm making a game with an A.I. that turns from one angle to another, turning left or right depending on which is quickest, you have to consider the 360->0 jump. Everytime I work it out and get it working in my program, I forget it again, and then have to work it out all over again for my next program.

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