gravity movement question

[zordork]

I am working on a game that requires landing a shuttle on a landing pad, but am having a bit of difficulty with the movement type I should use. What I am trying to achieve is:

shuttle is falling towards the ground in direction 28 accelerating at +1 per second, when the player presses and holds the left key the shuttle decelerates at a rate of -1 in direction 15 till it gets to 0 speed then accelerates at +1 in direction 15 and when the player presses and holds the right key the shuttle deccelerates at a rate of -1 in direction 1 till it gets to 0 speed then accelerates at +1 in direction 1. and if no key is pressed the the shuttle accelerates at +1 in direction 28

hope this makes sense, and any help would be greatly appreciated

[KLiK-iT]

Best thing to do would be to post the mfa so we can look at it. There is an example of this on Marv's site, I think.

[LittleTinyBabyMan]

KLiK-iT is right, post your .mfa here so we can look at it...

(I'm good at gravity-games )

[zordork]

shuttle.zip this is the mfa, as you can see it sort or works, but the speed stops at 0 when thrusting backwards and 1 when thrusting forwards

[KLiK-iT]

What are trying to accomplish with this? What is the issue?

[ChrisBurrows]

Do you mean +1 pixels, +1 speed or +1 acceleration? Regardless, the best movement type is none of them. Create your own movement.

How you ask? One step at a time. First, you need to make your ship move in direction 28 (aka 45 degrees South East). This is easy, at 1 pixel to the X and Y co-ordinates. This gets a little more difficult when you want your object to move in directions other than 0, 4, 8, 12, 16, 20, 24 or 28, for instance, direction 15. Or do you mean direction 16?, in which case you just subtract 1 from the X co-ordinate.

I recommend you research 360 degree movement, where moving your object goes something like this:

ALWAYS:
Set X to: X( "Object" )+(Cos(Angle( "Object" ))*CurrentSpeed( "Object ))
Set Y to: Y( "Object" )+(Cos(Angle( "Object" ))*CurrentSpeed( "Object ))

For more accurate results, don't use the actual X and Y position of your object. Instead, use Alterable Values to store the X and Y position, because Alterable Values can store floating point values and the actual X and Y position can only ever be an integer. It is late and I am having difficulties articulating elementary concepts. I'll make an example...

[ChrisBurrows]

BTW, I know you are not making a racing game. The example simply demonstrates how manipulate an object in 360 degrees.

[zordork]

What are trying to accomplish with this? What is the issue?

I dont want the shuttle to stop when it gets to speed 0 but to star accelerating backwards

*chrisburrows, thanks for giving me the idea of creating my own movments, I will have to give that a go, see if I can figure it out

[MuddyMole]

I presume you're using the built-in vector movement?
I've never really played around with that myself, but if you want to code your own "Lander" type movement it's super easy: http://skydrive.live.com/redir?resid...094271BBDA!531

[zordork]

I presume you're using the built-in vector movement?

No it was the space ship movement that I tryed to use