Using MIT Scratch for Programming and Control Exercise 2 Controlling movement with the keyboard

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Using MIT Scratch for Programming and
ControlExercise 2 Controlling movement with the
keyboard

• Year 9 ICT
• Autumn Term 2007

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What you will learn

• In this exercise we will learn
• how to control the movement of the sprite with
  the keyboard arrows using x and y co-ordinates
• We can combine this with the previous exercise to
  make the sprite walk around the screen

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Keyboard control

• It is possible to control your sprite using the
  keyboard arrow keys.
• There is a small pointer next to the Sprite
  symbol at the top of the screen which can be set
  to any angle thereby determining the natural
  direction of movement of the sprite.
• In this exercise we want the Sprite to move
  exactly up and down vertically or side to side
  horizontally so we will use the change x by and
  change y by instructions to order to ensure that
  the Sprite moves exactly horizontally or
  vertically

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Keyboard control

• Before completing this exercise dump your
  existing script into the left had side of the
  screen (this will delete it)

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Keyboard control

• Now copy the main part of the script then edit
  the sub script for each movement of the mouse
  determined by each of the respective four arrow
  keys

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Keyboard control

• Drop the three new copied sets of instructions
  inside the forever instruction (not inside the
  existing If condition instruction)
• Click the green flag button.
• It should now be possible to drive your cat
  sprite around the screen using the up, down, left
  and right arrow keys

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Keyboard control
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Cat walking with keyboard control

• Looking back over the previous exercises it
  should be possible to make a script combining
  what you have already learned that allows the Cat
  sprite to walk around the screen.

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Save your work

• Save this exercise with the file name catwalk2