Scratch

Check this project out    http://scratch.mit.edu/projects/archmage/72848

It will give you jumping codes.

Last edited by archmage (2008-03-08 16:13:35)

<when green flag clicked>
<set{ yVelocity }to( 0
<forever>
<if> <touching[ ground
<set{ yVelocity }to( 1
<if> <key[ up arrow ]pressed?>
<set{ yVelocity  }to( 15
<end>
<end>
<change{ yVelocity }by( -1
<change y by( <{ yVelocity }>
<end>

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Last edited by archmage (2008-03-08 16:24:25)

Also,where is a good place to get Mario sprites? The one I'm using for some reason won't go into my scratch project.

For mario sprites go to http://www.spriters-resource.com/nintendo/mario/

and to jump
<when green flag clicked>
<forever if><touching[ ground<<  <and>  >><key[ up arrow ]pressed?>
<repeat( 10 )
<change y by( 10 )

Read both of his posts, Teguki.  The first one is a simple approximation of gravity.

The first script makes the character fall if he is not touching the ground.  The second script therefore only needs to take teh character up, he will come back down automatically.

***

Its not the best way of doing it, mind you, as the second script does not interupt the first script, so he will be rising and falling at the same time.  This has been overcome by making the amount he rises bigger, but there are better ways around it.

***

One way is by using acceleration and velocity.

You need a vertical velocity (Y-Velocity).

Your falling script, inside a loop, would be:

If touching ground
- - set (Y-Velocity) to 0
- ELSE
- - change (Y-Velocity) by -1
Change Y by (Y-Velocity) <-(not inside the "If", but sill inside the loop)

This makes the character fall, and the speed at which he falls gradullay increases.

Then your Jump button needs a script like:

If Key [up arrow] pressed AND (Y-Velocity)=0
- Set Y-Velocity to 5

This results in the character leaping upwards at a speed of 5 (because of the other script) but the speed at which he rises gradually decreases until he starts to fall again.

Good point - I didn't notice that 

pixilion image converter or similar program, but you should have posted this in a new topic