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  Distance formula in Java?  (Read 2272 times)
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Offline SkyAphid
« Posted 2012-06-03 23:45:36 »

I don't know if it has something to do with OpenGL or it's just Java in general but..

1  
distance = (int) Math.sqrt(((ent.getX() - x) ^ 2) + ((ent.getY() - y) ^ 2));


I sometimes get NaN from that.

Although, if I move it around like this..

1  
distance = (int) Math.sqrt(((x - ent.getX()) ^ 2) + ((y - ent.getY()) ^ 2));


Instances where it would NaN would return normal numbers, but on the otherhand the instances where it returns a normal number is now NaN.

What did I do wrong? Both X/Y's are on concurrent matrices, so what is it?


it just werks
Offline Riven
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« Reply #1 - Posted 2012-06-03 23:54:34 »

1  
value ^ 2
means XOR



you either need:
1  
return (int) Math.sqrt(Math.pow(x - ent.getX()), 2.0) + Math.pow(y - ent.getY(), 2.0));


or more readable and much faster:
1  
2  
3  
dx = x - ent.getX();
dy = y - ent.getY();
return (int)Math.sqrt(dx*dx + dy*dy);

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Offline SkyAphid
« Reply #2 - Posted 2012-06-04 00:20:55 »

Thanks!!

it just werks
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Offline ReBirth
« Reply #3 - Posted 2012-06-04 03:10:59 »

Also there's distance method on... Point/Point2D.

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