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Movement is the action of changing an object's position. It is used to show action. Scratch provides various blocks that can be used to create movement, including the change x by (), change y by (), and move () steps blocks; these blocks can be found in the Motion category.
Following the Mouse
This script can be used to make a sprite follow the mouse-pointer.
when gf clicked // starts the script forever // repeats the movement until the stop sign is clicked point towards (mouse-pointer v) // aims for the mouse move (10) steps // moves towards the mouse
You can also use the following script to make a sprite follow the mouse-pointer but stay in a 90-degree direction.
when gf clicked//starts the script forever//this makes sure that the sprite keeps moving go to (mouse-pointer v) // moves sprite to the mouse-pointer
This script can be used for smoother movement:
when gf clicked forever point towards (mouse-pointer v) move ((distance to (mouse-pointer v)) / [5]) steps // Without the (()-()) block, the sprite would go straight to the mouse-pointer.
Arrow Keys Movement
This script gives more control over the movement, and it uses the arrow keys rather than the mouse. However, this script only allows for movement horizontally and vertically.
when green flag clicked
forever
if <key (up arrow v) pressed?> then
change y by (1)
end
if <key (down arrow v) pressed?> then
change y by (-1)
end
if <key (right arrow v) pressed?> then
change x by (1)
end
if <key (left arrow v) pressed?> then
change x by (-1)
end
These scripts also can be simplified by using boolean conditions in the []-[] block.
when green flag clicked forever change x by ((<key (right arrow v) pressed?> - <key (left arrow v) pressed?>) * (10)) change y by ((<key (up arrow v) pressed?> - <key (down arrow v) pressed?>) * (10))
Alternatively, the When key pressed block can also be used:
when [up arrow v] key pressed // if key is pressed change y by (10) // move in wanted direction when [down arrow v] key pressed change y by (-10) when [right arrow v] key pressed change x by (10) when [left arrow v] key pressed change x by (-10)
However, this has the limitation of requiring the player to hold the key for some time before moving continuously.
Velocity Movement
This script creates a smoother form of movement. It works by gradually increasing or decreasing the amount that the sprite moves each loop through the use of a variable.
when gf clicked // starts the script forever // loops the movement script if <key (right arrow v) pressed> then // detects an input change [x velocity v] by (1) // changes the velocity variable end if <key (left arrow v) pressed> then change [x velocity v] by (-1) end set [x velocity v] to ((x velocity) * (0.9)) // Slowly decreases velocity. 0.9 can be replaced with any value between 0 and 1 - the smaller it is, the faster the sprite stops. change x by (x velocity) // makes the sprite move based on the velocity variable
