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SetMagnitude trouble
http://45.55.195.193/viewtopic.php?f=73&t=16245		 Page 1 of 1
Author:  Areku [ Sun Aug 16, 2009 4:55 pm ]
Post subject:  SetMagnitude trouble
Once again, my Lua stuff gets errors for no apparent reason. I made a simple script to push stuff around with particles, and yet it doesn't work. I mean, at least not the way I wanted it to. Here's the thing:

Code:
function Create(self)
   self.timer = Timer();
   self.newmag = 0
end


function Update(self)

 
      for actor in MovableMan.Actors do
            local avgx = actor.Pos.X - self.Pos.X;
            local avgy = actor.Pos.Y - self.Pos.Y;
            local dist = math.sqrt(avgx ^ 2 + avgy ^ 2);
            if dist < 20 and self.timer:IsPastRealMS(10) then
               self.newmag = self.Vel.Magnitude + actor.Vel.Magnitude - (((actor.Pos.X - self.Pos.X) + (actor.Pos.Y - self.Pos.Y))/2) - (actor.Mass/2);
               actor.Vel = actor.Vel + self.Vel;
               print (self.newmag);
               actor.Vel:SetMagnitude(self.newmag);
            end
      end
end


So, basically, I wanted it to set the actor's vel magnitude based on several parameters, such as mass, previous vel, etc. The "print" line returns a number based on such parameters. And yet, the console doesn't accept that as a SetMagnitude command, and keeps returning "no overload of actor:setmagnitude matches parameters...". I fear that something weird and unbeknownst to me is happening there. Anyone knows why?
Author:  Grif [ Sun Aug 16, 2009 5:32 pm ]
Post subject:  Re: SetMagnitude trouble
Make a local vector, then set magnitude on that, then set the actor's Vel to that local vector.

Basically, actor.Vel is a property which happens to be a vector; it's not a strict Vector class vector. So you duplicate it to a straight up vector vector and then use SetMagnitude on that.
Author:  Areku [ Sun Aug 16, 2009 10:28 pm ]
Post subject:  Re: SetMagnitude trouble
Egad, it works! Thanks a lot.

Yet, another problem has been found. When the particles hit stuff, it tends to go on the wrong direction, like this:
Image

And no, mutiplying the actor's vel by -1 doesn't solve the problem.
Author:  Grif [ Sun Aug 16, 2009 10:33 pm ]
Post subject:  Re: SetMagnitude trouble
Well you're not accounting for hflipped, that's why. Vectors are absolute left to right, and obviously your code is returning positive X velocity. Try dividing (yeah, dividing) the vector by -1 if hflipped = true. (if you're facing right hflipped is false).

Also, is this being run on the actor or the gun?
Author:  Areku [ Sun Aug 16, 2009 11:51 pm ]
Post subject:  Re: SetMagnitude trouble
I don't think so. I'm dealing with MOParticles, and they don't even have a HFlipped variable. But I get your point, though. I'll try making the script check if actor.Pos.X - self.Pos.X is negative, and, if so, divide the actor's vel by -1.
Author:  Geti [ Mon Aug 17, 2009 3:41 am ]
Post subject:  Re: SetMagnitude trouble
Code:
local dist = (actor.Pos - self.Pos).Magnitude;
please..
also yeah, its the difference in X that you're having problems with.
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