Sam El-Husseini e3975e65e5 pxt-microbit Accessibility PR (#529 )

* Accessibility changes

2017-09-07 13:42:08 -07:00

2.7 KiB

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rotation animation block challenges

Coding challenges for the rotation animation.

Before we get started

Complete the following guided activity:

activity

At the end of the activity, your code should look like this:

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


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

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.

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.

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