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  basic forumula help?  (Read 1087 times)
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Offline CyanPrime
« Posted 2010-05-08 16:49:14 »

Some reason this formula doesn't guide "angle" to "(float) Math.toDegrees(Math.atan2(x - target.x, -(y - target.y)))"
Can someone tell me what I'm doing wrong?

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if(angle > (float) Math.toDegrees(Math.atan2(x - target.x, -(y - target.y))) && 
            angle <= -((float) Math.toDegrees(Math.atan2(x - target.x, -(y - target.y)))))
            angle -= handleing;
         
         else if(angle < (float) Math.toDegrees(Math.atan2(x - target.x, -(y - target.y))) &&
               angle > -((float) Math.toDegrees(Math.atan2(x - target.x, -(y - target.y)))))
               angle += handleing;
         
         x -= Math.sin(Math.toRadians(angle)) * speed;
         y += Math.cos(Math.toRadians(angle)) * speed;
Online Riven
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Hand over your head.


« Reply #1 - Posted 2010-05-08 17:26:09 »

it's atan2(y, x) not atan2(x, y)

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Offline Hansdampf

Senior Devvie


Projects: 3


too offending?


« Reply #2 - Posted 2010-05-08 17:32:57 »

besides the x/y swap,  your code hurts my eyes. Why don't you just write

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      float a = (float) Math.toDegrees(Math.atan2(x - target.x, -(y - target.y)));
      if (angle > a && angle <= -a)
         angle -= handleing;
      else if (angle < a && angle > -a)
         angle += handleing;
      x -= Math.sin(Math.toRadians(angle)) * speed;
      y += Math.cos(Math.toRadians(angle)) * speed;

lots of sillystupid games: http://www.emaggame.com
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