(Redirected from Change Y by ())

Change Y by ()
change y by ()
Category Motion
Type Stack

The change y by () block is a Motion block and a stack block. The block moves its sprite's Y position by the specified amount.

Example Uses

Often in games, the player controls a sprite and moves it around, such as with velocity. In this way, the change y by () block (and the change x by () block) can become very useful. The Y axis ranges from -180 to 180, but sprites can be moved further.

  • In this script, which could control a paddle in Pong, a yVelocity variable controls the sprite's up and down movement. This allows the sprite to accelerate and decelerate.
set [yVelocity v] to [0]
forever
    if <key (up arrow v) pressed?> then
        change [yVelocity v] by (2)
    end
    if <key (down arrow v) pressed?> then
        change [yVelocity v] by (-2)
    end
    change y by (yVelocity)
    if < (yVelocity) > [0] > then
        change [yVelocity v] by (-1)
    end
    if < (yVelocity) < [0] > then
        change [yVelocity v] by (1)
    end
end
  • This block is also commonly used in jump scripts, as shown below:
repeat (8)
    change y by (5)
    wait (0.1) seconds
    end
    wait (1) seconds
    repeat until <touching (Ground v)>
    change y by (-5)
    wait (0.1) seconds
    end

However, smoother jumping can be achieved by using this script:

glide (0.5)secs to x: ( x position ) y: ( ( y position ) + ( 40 ) )
wait (1) seconds
repeat until <touching (Ground v)>
    glide (0.125) secs to x:( x position ) y: ( ( y position ) - ( 10 ) )
end

Workaround

Main article: List of Block Workarounds

This block can be replicated by setting the y position instead of changing it.

set y to ( ( y position ) + ( change ) )

See Also

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