1 - Remix the starter project
We've created a starter project that has some custom sprites for this game.
Go to the starter project at the below link and click on the Remix button to create a copy of the project.
2 - Make the disc spin
In this game coloured balls will move towards the disc in the middle. You need to spin the wheel to match the colour of each ball as it hits the wheel. So we'll program the left and right arrow keys on our keyboard to spin the wheel in each direction.
Add the following code to the 'wheel' sprite:
when green flag clicked
go to x[0] y [0] // place it in the center
set size to [30]% // resize the wheel to 30%
forever
if < key (left arrow v) pressed? > then
turn ccw (3) degrees // turn anti clockwise
end
if < key (right arrow v) pressed? > then
turn cw (3) degrees // turn clockwise
end
end
Once you've added the code, click the green flag and test if your arrow keys spin the ball!
3 - Clone the ball
In the game, the balls should appear every few seconds, in a random position and start moving towards the wheel.
Add the following code to the green ball called 'Sprite1':
when green flag clicked
hide
forever
wait (pick random (4) to (8)) seconds // wait a random number of seconds
create clone of (myself v) // create the clone
end
when I start as a clone
go to (random position v) // start in a random position
point towards (wheel v) // point in the direction of the wheel
show
4 - Not too close!
We don't want the balls appearing too close to the wheel as it won't give us much time to react. So to prevent this add the following code to 'Sprite1' which detects where the ball is when it's cloned and deletes it if it's too close.
when I start as a clone
go to (random position v)
point towards (wheel v)
show // add new code under here
if < ( distance to (wheel v)) < (100) > then
delete this clone
end
5 - Make them move
Now that they're appearing randomly every few seconds we need to make them start moving towards the wheel. We've already used a block to point them at the wheel so now we just need to add this code to 'Sprite1':
when I start as a clone
go to (random position v)
point towards (wheel v)
show
if < ( distance to (wheel v)) < (100) > then
delete this clone
end
forever // add this code
move (2) steps
end
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Scratch is developed by the Lifelong Kindergarten Group at the MIT Media Lab. It is available for free at https://scratch.mit.edu