Scratch

This should do it.

when gf clicked
set [x v] to (0)
set [y v] to (0)
forever
if<key [right arrow v] pressed?>
change [x v] by (0.2)
end
if<key [left arrow v] pressed?>
change [x v] by (-0.2)
end
change x by (x)
if <touching [wall or floor sprite v]?>
set [x v] to ((-0.5)*(x))
change x by (x)
if <touching [wall or floor sprite v]?>
change x by (x)
end
end
if<key [space v] pressed?>// fly up when space is pressed
change [y v] by (0.2)
end
change [y v] by (-0.1)
change y by (y)
if<touching [wall or floor sprite v]?>
set [x v] to ((x)*(.98)) // friction on the ground
set [y v] to ((-0.5)*(y))
change y by (y)
if<touching [wall or floor sprite v]?>
change y by (y)
end
if<<key [up arrow v] pressed?> and <(y) > (0)>>
set [y v] to (5)
end
else
set [x v] to ((x)*(.99)) // less friction if you're in the air
end

I helped whiteflame115 with something similar to this. Anyway, at the end of one of Whiteflame115's topics, I made a guide on making sensors for platformers as well as how to make your character move and not run through walls. Just to warn you, it might be a bit complicated, and also remember that the my tutorial is at the end of it. Anyway, here's a link to the topic:
how to make a sprite move up a diagonal line?

Just to let you know, my tutorial doesn't have everything in it. For example, if you were only using my scripts, then you could jump through ceilings, but that can be avoided with the right scripts.

Anyhow, I hope that this helps!

Last edited by ErnieParke (2012-08-06 17:06:14)

maxamillion321 wrote:

You use the go to script.

go to x:(0):y(0)

Fixed:

go to x: (0) y: (0)

JamieBruce wrote:

nonsense   

What do you mean by "nonsense"?

Here:

when gf clicked
move somehow XD