A steady Curveangle? - GameCreators Forum

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TheComet

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Joined: 18th Oct 2007

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Posted: 29th Dec 2008 17:56

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Hello!

I am having problems with slowly angling the current angle to the destination angle.

I need a curveangle command, but it should be steady(not decrease in speed as it gets closer to the destination). I need it to always rotate in steps of four.

Is this possible? Keep in mind that I am using wrapped values...

TheComet

Peachy, and the Chaos of the Gems

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Latch

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Posted: 30th Dec 2008 00:14

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Approach it just like you would if you were rotating an object or the camera using arrow keys. As long as the key is pressed, you inc or dec the yangle a certain number of units. So, until current angle = destination angle, increment or decrement current angle a uniform amount. Because it's possible to pass the destination angle, check to see if the current angle is within a certain range of the destination angle. Turn off wrap for the calculations and turn it on for the rotations.
if abs(destination-current) is < 1 or whatever, then current=destination.

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TheComet

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Posted: 30th Dec 2008 20:13

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Hmm, well, I need it to go the shortest direction. I tried using this:

+ Code Snippet

if destination>angle then inc angle,4
if destination<angle then dec angle,4
angle=wrapvalue(angle)

But all my tank does is jiggle back and forwards...

And that is because of the wrapped value... I think I have an idea, but it probably won`t work. If it does, I will post it.

TheComet

Peachy, and the Chaos of the Gems

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Latch

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Posted: 30th Dec 2008 21:08

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I ran a few tests. This seems to work. You might want to test it more.

+ Code Snippet

rem even rotate
rem by latch
rem 12/30/2008

sync on
make object cube 1,25

do
   cur#=object angle y(1)
   dest#=rnd(360)
   repeat
      cur#=wrapvalue(cur#+even_rotate(cur#,dest#,4.0))
      if abs(dest#-cur#) < 4.5
         cur#=dest#
      endif
      yrotate object 1,wrapvalue(cur#)
      text 0,0,"Inside while loop"
      text 0,20,str$(abs(dest#-cur#))
      text 0,40,str$(cur#)
      text 0,60,str$(dest#)
      sync
   until cur#=dest#

   sync
loop



function even_rotate(cur#,dest#,angstep#)
   angstep#=abs(angstep#)
   if (cur# >= 0 and cur# < 90) and (dest# >= 270 and dest# < 360)
      angstep#=0-angstep#
   endif
   if (cur# >= 0 and cur# < 180) and (dest# < cur#)
      angstep#=0-angstep#
   endif
   if (cur# >= 180 and cur# < 360) and (abs(dest#-cur#)<=180) and (dest# < cur#)
      angstep#=0-angstep#
   endif
endfunction angstep#

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TheComet

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Posted: 30th Dec 2008 21:42

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Hey, cool Latch! That`s exactly what I need. Thanks a bunch!

TheComet

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