Scratch

alexthechicken · 2012-03-16 05:18:26

Please help, not clear!

Hardmath123 · 2012-03-16 06:04:52

The Wiki Knows All wink

hokkaidoandme · 2012-03-16 07:09:33

no one likes answering gravity questions properly...... with sceen shots..... same happened to me,,,,,

Hardmath123 · 2012-03-16 07:16:11

Fine, I'll answer it "properly". What sort of gravity? Like Earth-and-moon or person-and-Earth?

Splodgey · 2012-03-16 10:03:03

Normally it's like this:

when gf clicked
set [yvel v] to [0]
forever
if <touching [ground v]?>
if <(0?) = [1]> //only necessary if you have jumping.
set [yvel v] to [0] //or 1 if you're not using the nice slope physics.
end
set [0? v] to [0] //again only if there's jumping involved 
else
change [yvel v] by [-1] //or whatever
set [0? v] to [1]

If you set yvel to 1, you might not need "0?".
To jump;

if <<touching [ground v]?> and <key [up arrow v] pressed?>> //or whatever controls
set [yvel v] to (Jumpspeed)

Last edited by Splodgey (2012-03-16 10:03:45)

chanmanpartyman · 2012-03-16 12:01:55

Here's a formula I like to use for gravity and friction:

when gf clicked
forever
 if <key [right arrow v] pressed?>
  change [xvel v] by (1)
 end
 if <key [left arrow v] pressed?>
  change [xvel v] by (-1)
 end
 set [xvel v] to ((xvel) * (.87))
 change x by (xvel)
 if <touching [level v]?>
  change x by ((0)-(xvel))
  set [xvel v] to (0)
 end
 if <key [up arrow v] pressed?>
  change y by (-1)
  if <touching [level v]?>
   set [yvel v] to (10)
  end
  change y by (1)
 end
 if <(yvel) < [3]>
  change y by (-1)
  if <not<touching [level v]?>>
   change (yvel) by (-1)
  end
  change [yvel v] by (1)
 end
 set [yvel v] to ((yvel) * (0.9))
 change y by (yvel)
 if <touching [level v]?>
  change y by ((0) - (yvel))
  set [yvel v] to (0)
 end
end

Last edited by chanmanpartyman (2012-03-18 13:07:43)

joefarebrother · 2012-03-16 12:58:23

chanmanpartyman wrote:

Here's a formula I like to use for gravity and friction:

when gf clicked
forever
 if <key [right arrow v] pressed?>
  change [xvel v] by (1)
 end
 if <key [left arrow v] pressed?>
  change [xvel v] by (-1)
 end
 set [xvel v] to ((xvel) * (.87))
 change x by (xvel)
 if <touching [level v]?>
  change x by ((0)-(xvel))
  set [xvel v] to (0)
 end
 if <key [up arrow v] pressed?>
  change y by (-1)
  if <touching [level v]?>
   set [yvel v] to (10)
  end
  change y by (1)
 end
 if <(yvel) < [3]>
  change y by (-1)
  if <not<touching [level v]?>>
   change [yvel v] by (-1)
  end
  change [yvel v] by (1)
 end
 set [yvel v] to ((yvel) * (0.9))
 change y by (yvel)
 if <touching [level v]?>
  change y by ((0) - (yvel))
  set [yvel v] to (0)
 end
end

Now some of the stuff showed up red, but you probably know what they mean big_smile

you forgot the question marks in some of the blocks big_smile
I put them in for you

Last edited by joefarebrother (2012-03-16 12:59:50)

chanmanpartyman · 2012-03-16 14:16:14

joefarebrother wrote:

chanmanpartyman wrote:

Here's a formula I like to use for gravity and friction:

when gf clicked
forever
 if <key [right arrow v] pressed?>
  change [xvel v] by (1)
 end
 if <key [left arrow v] pressed?>
  change [xvel v] by (-1)
 end
 set [xvel v] to ((xvel) * (.87))
 change x by (xvel)
 if <touching [level v]?>
  change x by ((0)-(xvel))
  set [xvel v] to (0)
 end
 if <key [up arrow v] pressed?>
  change y by (-1)
  if <touching [level v]?>
   set [yvel v] to (10)
  end
  change y by (1)
 end
 if <(yvel) < [3]>
  change y by (-1)
  if <not<touching [level v]?>>
   change [yvel v] by (-1)
  end
  change [yvel v] by (1)
 end
 set [yvel v] to ((yvel) * (0.9))
 change y by (yvel)
 if <touching [level v]?>
  change y by ((0) - (yvel))
  set [yvel v] to (0)
 end
end

Now some of the stuff showed up red, but you probably know what they mean big_smile

you forgot the question marks in some of the blocks big_smile
I put them in for you

Oh, that's what it was, I don't do this often tongue Thanks!

turkey3 · 2012-03-17 12:59:41

There are so many gravity topics. They should all be put in one folder.

jedidiahzhu · 2012-03-18 13:28:26

This is how I do it:

when gf clicked
forever
change y by ( (0)-(gravity) )
end

If you are using scrollY, don't use the "()-()" block. Just place in the variable "gravity".

when [up arrow v] key pressed
repeat (10)
change y by (10)
end
wait until (sprite touching ground)

when gf clicked
forever
wait until <(touching ground)=(false)>
set [gravity v] to (0)
repeat until <(touching ground)=(true)>
change [gravity v] by (0.5)
end
set [gravity v] to (0)
end

Replace the "touching ground" with whatever you like: a color sensor, a variable, whatever.

Hope this helped!

Scratch

archived forums

#1 2012-03-16 05:18:26

How to make gravity?

#2 2012-03-16 06:04:52

Re: How to make gravity?

#3 2012-03-16 07:09:33

Re: How to make gravity?

#4 2012-03-16 07:16:11

Re: How to make gravity?

#5 2012-03-16 10:03:03

Re: How to make gravity?

#6 2012-03-16 12:01:55

Re: How to make gravity?

#7 2012-03-16 12:58:23

Re: How to make gravity?

chanmanpartyman wrote:

#8 2012-03-16 14:16:14

Re: How to make gravity?

joefarebrother wrote:

chanmanpartyman wrote:

#9 2012-03-17 12:59:41

Re: How to make gravity?

#10 2012-03-18 13:28:26

Re: How to make gravity?

Board footer