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The sprite draws a non-stop line wherever it moves using pen down .
Use set pen color to block to set the colour of the pen to a colour of your
choice from the drop-down menu.
Change pen color by 10 block changes the pen colour, saturation, brightness
and transparency. Click on the first text box to select and change the pen effects.
Click on the second text box to give a value by which the effect will change.
set pen color to 50 block will set the pen colour, saturation, brightness and
transparency to the given value.
Clickipedia
A loop is a process which instructs a computer to repeat a set of commands,
a specified number of times.
USE OF LOOP BLOCKS
All the programs or projects developed till now run only once. If you want to run
a set of statements more than once, you will either run the code again or write
the script again. In Scratch, we can save our time and effort by repeating the code
without writing the program again or writing the script again. The automatic
running of a set of instructions more than once is called looping. The blocks for
looping are given in the Control category.
The repeat block is used to run a set of instructions for a specified
number of times.
The repeat until block is used to run a set of instructions till a
condition is satisfied.
The forever block is used to run a set of instructions continuously
until stopped. The instructions inside this block will be executed in a
loop until the Stop button is clicked by the user.
More on Scratch 79

