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Author Topic: [Request / Solved] (C++) Atan2  (Read 2400 times)

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Ben
[Request / Solved] (C++) Atan2
« on: April 18, 2006, 06:44:07 pm »
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Does anyone know where 0 of this is? (North, East, South, West)
And what direction does it go in (clock, anti-clock).
« Last Edit: February 24, 2012, 12:18:50 pm by Niek »
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Re: (C++) Atan2
« Reply #1 on: April 18, 2006, 07:42:38 pm »
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Normally 0 is on the right (East) and it goes counter-clockwise.
0 - East
90 - North
180 - West
270 - South
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Ben
Re: (C++) Atan2
« Reply #2 on: April 18, 2006, 07:45:21 pm »
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Oddly enough it goes clockwise :S.
I just tried it, lol.
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aab

^ Evolved from a Hobbit
Re: (C++) Atan2
« Reply #3 on: April 19, 2006, 10:52:07 pm »
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lol. Mathematics is all anti-clockwise, its just that because the screen your drawing to is vertically flipped it ends up differently: It would be an easy mistake to make.
Revolve the x axis towards the y axis, and that is your positive angle or rotation. When your working in 3d, x to y == yaw, y to z == pitch, z to x==roll, so its always positive when moving one along ...xyzxyzxyzxyzxyz... and negative the other way. Just remmember that.
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Ben
Re: (C++) Atan2
« Reply #4 on: April 21, 2006, 01:01:02 pm »
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Yeh I know that it should work anti-clockwise, and along cartesian axes it does work anti-clockwise but unfortunately some idiot (tcha who's stupid idea was that) decided that we should have the x min and the y min as the top left hand corner.

It's bloody annoying doing all your math on a cartesian plane and then doing your computer drawing with an inverted y axis.
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aab

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Re: (C++) Atan2
« Reply #5 on: April 21, 2006, 03:29:10 pm »
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Well, its the way the scanline moves, and the way we write: And all this started out with (well..boxes..but then moved onto) text.
It is weird though...You always have to think of your math upside down lol.
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