im trying to create a "wobbling" effect with a bitmap

It somewhat depends on what the effect is intended to acheive.

Here is a simple behavior script that can be applied to any bitmap. It wobbles, in the sense that it has a radom movement about its axis.

That is acheived with the random() statements. The amount of wobble can be controlled by changing the value added to each parameter on each iteration.

The last three statements keep the wobble from randomly walking off the frame. Again, wobble can be changed by setting the corrective value at which point the bitmap returns to its original state.

Hope this helps.

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property spritenum

global glocH, gLocV, gRotation

On beginsprite

  gloch = sprite(spritenum).loch
  gloch = sprite(spritenum).locv
  gRotation = integer(sprite(spritenum).Rotation)
end

On enterframe

b = random(2)
 
  if b=1 then
    sprite(spritenum).loch = sprite(spritenum).loch + random(2)
  else
    sprite(spritenum).loch = sprite(spritenum).loch - random(2)
  end if
 
  c= random(2)
 
  if c=1 then
    sprite(spritenum).locv = sprite(spritenum).locV + random(2)
  else
    sprite(spritenum).locv = sprite(spritenum).locV - random(2)
  end if
 
 
  d= random(2)
 
  if d=1 then
   
    Sprite(spritenum).rotation = sprite(spritenum).rotation + random(4)
  else
   
    Sprite(spritenum).rotation = sprite(spritenum).rotation - random(4)
  end if
 
if abs(gloch + sprite(spritenum).loch) <= 8  then sprite(spritenum).loch = gloch
if abs(glocv + sprite(spritenum).locv) <= 8 then sprite(spritenum).locv = glocv
if abs(Integer(gRotation - sprite(spritenum).Rotation)) >=8 then sprite(spritenum).rotation = gRotation

end