m (Changed a couple blocks.)
m
Line 28: Line 28:
 
when gf clicked
 
when gf clicked
 
repeat until <(seconds) = [0]>
 
repeat until <(seconds) = [0]>
  ...
+
  . . .
 
end
 
end
 
</scratchblocks>
 
</scratchblocks>
Line 37: Line 37:
 
set [old timer v] to (timer)
 
set [old timer v] to (timer)
 
repeat until <(timer) > ((old timer) +  (limit))>
 
repeat until <(timer) > ((old timer) +  (limit))>
   ...
+
   . . .
 
end
 
end
 
</scratchblocks>
 
</scratchblocks>

Revision as of 01:07, 18 September 2013

There are several methods to make a script perform an action for a set amount of time. This tutorial will cover the simplest of them. Technically, this may not work if you have wait blocks or other blocks that take up time.

This script uses the timer and the Repeat Until block. It will repeat the action until the timer is greater than the set limit.

These timer-based repeater scripts can be used in many different ways. The one pictured is for a sprite that will continuously move to the right for the set amount of time.

when green flag clicked
go to x: (x location) y: (y location)
reset timer
repeat until <(timer) > (limit)>
  change x by (1)
end
  • x location is the x of where the sprite goes to before it starts.
  • y location is the y of where the sprite goes to before it starts.
  • limit is how long the action should be repeated for (e.g. if the limit were 10, the sprite would drift to the right for 10 seconds).

If the timer is already being used and cannot be reset without ruining the project, a variable can be used instead of the timer:

when gf clicked
set [seconds v] to [0] //enter amount of time to repeat for
repeat until <(seconds) = [0]>
 wait (1) secs
 change [seconds v] by (-1)
end

when gf clicked
repeat until <(seconds) = [0]>
 . . .
end

This method is less accurate than the method below, as all computers take time to process each block.

when gf clicked
set [old timer v] to (timer)
repeat until <(timer) > ((old timer) +  (limit))>
  . . .
end

This method is far more exact, because the timer is correct to ±3500 ms/day, whereas a variable is not always updated at the exact millisecond.