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  [SOLVED] Libgdx - Rotate The whole Particle Emitter  (Read 521 times)
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Online Andre Lopes
« Posted 2014-02-21 19:32:55 »

Hi Guys.. Im making a particle emitter that should work as a "missile" , or so to speak...

But i just noticed that theres no method to setRotation / Set angle but

i found this :

""
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for (int i = 0; i < particleEffect.getEmitters().size; i++) { //get the list of emitters - things that emit particles
            particleEffect.getEmitters().get(i).getAngle().setLow(angle); //low is the minimum rotation
            particleEffect.getEmitters().get(i).getAngle().setHigh(angle); //high is the max rotation
         }


My question is.. How do i rotate this properly? I dont get this setLow, setHigh?


Can anyone give me a tip?
Offline Jimmt
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« Reply #1 - Posted 2014-02-21 19:41:12 »

Oh, that's my tutorial isn't it?
Basically, particle emitters emit particles in an angle. Low and high determine the maximum and minimum bounds of what angle a particle is emitted at. If you want just a straight beam of particles, just set the low/high angle the same; if you want particles to be emitted all around, set low to 0 and high to 360.
Online Andre Lopes
« Reply #2 - Posted 2014-02-21 20:02:59 »

Hey Jimmt Tongue

So if i want it to go to the Left <-------------:::: 
I just use Degrees º : 90º

set(90)

to both of them.. Correct?

Thanks for the tutorial by the way Tongue
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Offline Jimmt
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« Reply #3 - Posted 2014-02-21 21:36:09 »

Hey Jimmt Tongue

So if i want it to go to the Left <-------------:::: 
I just use Degrees º : 90º

set(90)

to both of them.. Correct?

Thanks for the tutorial by the way Tongue
90 degrees would be straight up, because we start from the positive x axis and then rotate counter clockwise. To the left would be 180º
Online Andre Lopes
« Reply #4 - Posted 2014-02-22 02:56:06 »

Hey Jimmt Tongue

So if i want it to go to the Left <-------------:::: 
I just use Degrees º : 90º

set(90)

to both of them.. Correct?

Thanks for the tutorial by the way Tongue
90 degrees would be straight up, because we start from the positive x axis and then rotate counter clockwise. To the left would be 180º

Ah, got it.
Btw, why do they work like that? I mean.. Isnt the common-sense to start 0º at the north?
Offline Jimmt
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Medals: 136
Projects: 4
Exp: 3 years



« Reply #5 - Posted 2014-02-22 03:00:47 »

In standard mathematics (trigonometry) you start from the positive x axis, and same with polar coordinates/equations.
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