146 lines
2.7 KiB
Markdown
146 lines
2.7 KiB
Markdown
# rotation animation block challenges
|
|
|
|
Coding challenges for the rotation animation.
|
|
|
|
## Before we get started
|
|
|
|
Complete the following guided activity:
|
|
|
|
* [activity](/microbit/lessons/rotation-animation/activity)
|
|
|
|
At the end of the activity, your code should look like this:
|
|
|
|
|
|
```blocks
|
|
let rotating = true;
|
|
while (rotating) {
|
|
basic.pause(20)
|
|
basic.showLeds(`
|
|
# . . . .
|
|
. # . . .
|
|
. . # . .
|
|
. . . # .
|
|
. . . . #
|
|
`)
|
|
basic.showLeds(`
|
|
. . # . .
|
|
. . # . .
|
|
. . # . .
|
|
. . # . .
|
|
. . # . .
|
|
`)
|
|
basic.showLeds(`
|
|
. . . . #
|
|
. . . # .
|
|
. . # . .
|
|
. # . . .
|
|
# . . . .
|
|
`)
|
|
basic.showLeds(`
|
|
. . . . .
|
|
. . . . .
|
|
# # # # #
|
|
. . . . .
|
|
. . . . .
|
|
`)
|
|
}
|
|
```
|
|
|
|
|
|
### Challenge 1
|
|
|
|
Now let's add to this by creating a condition for on button pressed `A` before the while loop. We will also introduce serial writeLine for the while loop and input OnButtonPressed
|
|
|
|
```blocks
|
|
|
|
let rotating = true;
|
|
while (rotating) {
|
|
serial.writeLine("loop")
|
|
basic.showLeds(`
|
|
# . . . .
|
|
. # . . .
|
|
. . # . .
|
|
. . . # .
|
|
. . . . #
|
|
`)
|
|
basic.showLeds(`
|
|
. . # . .
|
|
. . # . .
|
|
. . # . .
|
|
. . # . .
|
|
. . # . .
|
|
`)
|
|
basic.showLeds(`
|
|
. . . . #
|
|
. . . # .
|
|
. . # . .
|
|
. # . . .
|
|
# . . . .
|
|
`)
|
|
basic.showLeds(`
|
|
. . . . .
|
|
. . . . .
|
|
# # # # #
|
|
. . . . .
|
|
. . . . .
|
|
`)
|
|
}
|
|
input.onButtonPressed(Button.A, () => {
|
|
serial.writeLine("hello")
|
|
})
|
|
|
|
```
|
|
|
|
### Challenge 2
|
|
|
|
### @video td/videos/rotation-animation-1-and-2
|
|
|
|
Now that we have the on button pressed condition, let's make the animation stop rotating by setting the rotating global variable to false when button `A` is pressed.
|
|
|
|
```blocks
|
|
let rotating = true;
|
|
while (rotating) {
|
|
serial.writeLine("loop")
|
|
basic.showLeds(`
|
|
# . . . .
|
|
. # . . .
|
|
. . # . .
|
|
. . . # .
|
|
. . . . #
|
|
`)
|
|
basic.showLeds(`
|
|
. . # . .
|
|
. . # . .
|
|
. . # . .
|
|
. . # . .
|
|
. . # . .
|
|
`)
|
|
basic.showLeds(`
|
|
. . . . #
|
|
. . . # .
|
|
. . # . .
|
|
. # . . .
|
|
# . . . .
|
|
`)
|
|
basic.showLeds(`
|
|
. . . . .
|
|
. . . . .
|
|
# # # # #
|
|
. . . . .
|
|
. . . . .
|
|
`)
|
|
}
|
|
input.onButtonPressed(Button.A, () => {
|
|
serial.writeLine("hello")
|
|
rotating = false
|
|
})
|
|
|
|
```
|
|
|
|
* Run the code to see the awesome rotation.
|
|
|
|
### Challenge 3
|
|
|
|
Let's also make the image rotate the opposite way when button A is pressed! We can do this with another while loop that is only executed while `not rotating`.
|
|
|