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  Rotating towards a point  (Read 684 times)
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Offline Mads

JGO Ninja


Medals: 26
Projects: 3
Exp: 6 years


One for all!


« Posted 2012-07-11 18:48:01 »

Hi!

I'm trying to rotate my dibily, so it's facing the point I specify. Currently, when it's facing north it's at 90 degrees.
I ran a test using this code, with very inaccurate results.
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dibily.setRotation((float)Math.toDegrees(Math.atan2(input.getMouseX(), input.getMouseY())));


This is a fairly simple problem on these forums - I have lost my reference for trig and the likes in a hardware error, and I can't recall the exact procedure.

Thanks guys!

Skål!  Cool

Offline Vladiedoo
« Reply #1 - Posted 2012-07-11 19:31:29 »

Try this
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dibily.setRotation((float)(Math.atan((input.getMouseY() - dibily.getY())/(input.getMouseX() - dibily.getX())));

That's what I use to rotate to my mouse, if that doesn't work there are other things to try.
Offline Mads

JGO Ninja


Medals: 26
Projects: 3
Exp: 6 years


One for all!


« Reply #2 - Posted 2012-07-11 20:07:11 »

Try this
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dibily.setRotation((float)(Math.atan((input.getMouseY() - dibily.getY())/(input.getMouseX() - dibily.getX())));

That's what I use to rotate to my mouse, if that doesn't work there are other things to try.

Nope, didn't work. You forgot degrees too. This is what I executed.
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public void facePoint(int x, int y) {
      setRotation((float)Math.toDegrees(Math.atan((y - getY())/(x - getY()))));
   }

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Offline Mads

JGO Ninja


Medals: 26
Projects: 3
Exp: 6 years


One for all!


« Reply #3 - Posted 2012-07-11 20:47:07 »

Got it working!
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public void facePoint(int x, int y) {
      setRotation((float)Math.toDegrees(Math.atan2((y - getY()), (x - getY()))));
   }


EDIT: Did not. Read further.

Offline Vladiedoo
« Reply #4 - Posted 2012-07-11 20:54:37 »

Got it working!
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public void facePoint(int x, int y) {
      setRotation((float)Math.toDegrees(Math.atan2((y - getY()), (x - getY()))));
   }


Yay : D! Sorry if I wasn't much help, I was away when you replied.
Offline Mads

JGO Ninja


Medals: 26
Projects: 3
Exp: 6 years


One for all!


« Reply #5 - Posted 2012-07-11 21:38:41 »

Got it working!
1  
2  
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public void facePoint(int x, int y) {
      setRotation((float)Math.toDegrees(Math.atan2((y - getY()), (x - getY()))));
   }


Yay : D! Sorry if I wasn't much help, I was away when you replied.

I have now used the code a little further and it turns out it's still not entirely accurate. It works, but the margin of error is big (something close to 50 degrees). If anyone has further input it is much appriciated.

Offline Mads

JGO Ninja


Medals: 26
Projects: 3
Exp: 6 years


One for all!


« Reply #6 - Posted 2012-07-11 21:48:24 »

Alright. Finally this is working out!  Smiley
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public void facePoint(int x, int y) {
      setRotation((float)Math.toDegrees(Math.atan2(y - getY(), x - getX())));
}


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