Simple Movement with MIT Scratch | Learn to Program and Control

1. Using MIT Scratch for Programming and ControlExercise 1Creating movement

2. What you will learn • In this exercise we will learn: • How to create a simple movement programme (called a script in programming language) • How to make the sprite reverse in direction • How to make the movement go forever (until we stop the programme) • How to make the sprite “walk” on the screen using costumes

3. Simple movement • One of the easiest programs to make is one that moves a figure on the screen. • In Scratch the figure is called a Sprite. • By default the sprite is a cat but there are many other sprites that we can use and that we will see later……….

4. Simple movement • Click on the Control button shown on the left • A series of commands will appear below the topics box. • Select the first one (when flag is clicked), and drag it to the Scripts area of the screen.

5. Simple movement • Next click the Motion button (to the left of the Control button). • Drag the move 10 steps button across and lock it underneath the earlier command. Your program should look like the one on the right. • Click the green flag near the top right of the Scratch screen to run your program.

6. Amending the program • Now every time you click the green flag the sprite will move by 10 steps. • You can change the amount of movement by altering the figure in the movement command. • Double click on the value in the movement control and type in a new value.

7. Changing Direction • In this program we will make the sprite change direction. We will build on the program that we have created already. • Change the movement value in your previous program from 10 to 40. • Click the control option again and select the wait 1 secs command • Click the motion button and add the point in direction 90 command below it.

8. Changing Direction • Click the motion button and add the point in direction 90 command below it. • Click on the arrow beside the 90 and select -90 from the list. • Add another movement command and change the value to match the first • Add another wait command, and then another 'point' command.

9. Changing Direction • Finally, at the top of the screen where there is a small image of the sprite, click the middle button next to the image of the sprite. This makes the sprite change direction to match his movement

10. Repeated movement • Repeated movement (using forever) • Often we want the sprite to be animated continuously until we tell it to stop. • In order to get the script that we have written to loop use the Forever instruction.

11. Walking sprite • Click on the costumes tab – note that the cat sprite comes with two costume • Rename the sprite as cat • Rename the costumes as Catwalk1 and catwalk2

12. Walking sprite

13. Walking sprite • If you have followed all of the instructions correctly your sprite should walk backwards and forwards across the screen • Save this project is your user area with the file name catwalk1