Scratch

The easiest way is to create x and y variables for the Rayman sprite, and adjust those when you use the arrow keys.  ScrollX and ScrollY are then set based on those. 

I guess we'll just say that Rayman_Shadow is 20 frames behind Rayman.  So...

For the Rayman sprite:

when gf clicked
set [numberFramesBehind v] to (20)
set [ListIndex v] to (1)
delete (all v) of [previousXPositions v]
delete (all v) of [previousYPositions v]
repeat (numberFramesBehind)
  add [0] to [previousXPositions v]
  add [0] to [previousYPositions v]
end
forever
  if <key [right arrow v] pressed?>
    do something to [PositionX v]
  end
  if <key [left arrow v] pressed?>
    do something to [PositionX v]
  end
  if <key [up arrow v] pressed?>
    do something to [PositionY v]
  end
  set [ScrollX v] to (PositionX) // Maybe PositionX * -1, depending on config.
  set [ScrollY v] to (PositionY) // Again, don't know how you have it set up.  
  replace item (ListIndex) of [previousXPositions v] with (PositionX)
  replace item (ListIndex) of [previousYPositions v] with (PositionY)
  broadcast [ShadowUpdate v] and wait
  change [ListIndex v] by (1)
  if <(ListIndex) > (numberFramesBehind)>
    set [ListIndex v] to (1)
  end
end

Now, put this script in Rayman_Shadow

when I receive [ShadowUpdate v]
set x to ( item ( ((ListIndex) mod (numberFramesBehind)) + (1) ) of [PreviousXPositions v] )
set y to ( item ( ((ListIndex) mod (numberFramesBehind)) + (1) ) of [PreviousYPositions v] )

That should work.  I still have to test the shadow script sometime, I'll edit it and fix if it doesn't work.

Last edited by amcerbu (2012-04-27 16:25:33)

Borrego6165 wrote:

hey- you know on the forums? well you told me to make some changes to my Rayman 4 game for the shadow, and I was wondering if you could help me out. It mostly works, but with jumping the shadow over does it, and I was wondering how I could calculate it perfectly to match the correct jump.

Borrego6165,

If you could upload the project as it is, I'll take a look at it.  I'm not sure how you have scrolling and all the rest set up. 

From the description of the bug, it looks like there are other scripts also acting on Rayman_Shadow.  Make sure you don't have any other code running at the same time.  Make sure as well that the sensing scripts for movement and the scripts for recording velocity are all under one loop, or that they run one at a time.  Anything will work, as long as you don't have two forever loops running. 

Example:
All under one loop:

when gf clicked
initialize list
forever
  move Rayman based on keyboard input
  record Rayman's positions, broadcast to Rayman_Shadow
end

... or if you want to use separate scripts

when gf clicked
initialize list
forever
  move Rayman based on keyboard input.
  broadcast [recordPositions v] and wait
end

when I receive [recordPositions v]
record Rayman's positions, broadcast to Rayman_Shadow

The key to all these scripts is that you're using broadcast and wait.  The waiting makes sure that you don't end up with multiple scripts running at the same time and affecting eachother in ways you don't want.

Last edited by amcerbu (2012-04-27 16:31:04)

Whoops, sorry about that.  Give me a second to check it out.  I played the first level.  Where does the shadow come in?

Last edited by amcerbu (2012-04-27 17:11:37)

I've checked it out/downloaded, but I'm still trying to figure out why the shadow is off.  I'll get back to you later this weekend or sometime next week.