Kaleidoscope
The Goal
Step 1: Set the stage
Step 2: Delete the cat
Step 3: Draw a star
Step 4: Add spin
Step 5: Change colors
Step 6: Stamp
Step 7: Clear and Go
Step 8: Grow
Step 9: Two stars
Step 10: Opposite turns
The goal
Here’s the project that you’ll create:
Step 1. Set the stage
Make a new project. Then change the color of the stage to black. Can you figure out how to do that?
Step 2. Delete the cat
Delete the cat sprite. Hint! Use the scissors tool. Can you figure out how to do that?
Step 3. Draw a star
Watch the movie below to learn how to draw a star! There’s a trick…
Step 4. Add spin
How would you make the star spin slowly and continuously around its center?
Hint! To make the star spin, you need just three pieces (or commands).
- See if you can figure out the correct order and placement for these commands.
- Try changing the number in the turn command to make the star turn faster or slower.
Step 5. Change colors
How would make the star change color as it spins?
Hint! You need to add just the change colors command.
- Can you figure out where to put it?
- Try changing the number in the color command to make the colors change faster or slower.
See if you can make your Scratch project spin and show colors.
Step 6. Stamp
You can get an interesting effect if you add the Stamp command. Where should you place the Stamp command so that your project looks like the movie below? What does the Stamp command do?
Step 7. Clear and Go
We need to add 2 commands to our star, just beneath When green flag clicked. These commands tell the star to erase any previous artwork (clear) and to go to the center of the screen (x:0 y:0).
Step 8: Grow
Now we need to make the star grow as long as the mouse button is held down. And we need to return the star to its original size when the mouse button is released.
Can you add the commands below to your script to make that happen?
Step 9. Two stars
To finish, we’ll add another star.
To do so, we duplicate the first star like this:
Note! If you’re using a Windows computer (or a Macintosh with a mouse that has buttons on its sides), you don’t press the ctrl key. Just right-click the first sprite instead to display the menu!
Step 10. Opposite turns
Can you tell the second star to turn in the opposite direction? Do it!
. . .
That’s it! Enjoy!
This project was created by Almanac at http://scratch.mit.edu.
