163 lines
2.3 KiB
Markdown
163 lines
2.3 KiB
Markdown
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# screen wipe blocks challenges
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Coding challenges for screen wipe.
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## Before we get started
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Complete the [screen wipe](/microbit/lessons/screen-wipe) activity and your code will look like this:
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```blocks
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basic.showLeds(`
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# # # # #
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# # # # #
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. . . . .
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. . . . .
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. . . . .
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`)
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basic.showLeds(`
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# # # # #
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# # # # #
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# # # # #
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# # # # #
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. . . . .
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`)
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basic.showLeds(`
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. . . . .
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. . . . .
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# # # # #
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# # # # #
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. . . . .
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`)
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basic.showLeds(`
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. . . . .
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. . . . .
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. . . . .
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# # # # #
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# # # # #
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`)
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input.onButtonPressed(Button.A, () => {
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basic.clearScreen()
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})
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```
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**Challenge 1**
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Create an event handler for Button B.
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```blocks
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basic.showLeds(`
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# # # # #
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# # # # #
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. . . . .
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. . . . .
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. . . . .
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`)
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basic.showLeds(`
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# # # # #
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# # # # #
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# # # # #
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# # # # #
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. . . . .
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`)
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basic.showLeds(`
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. . . . .
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. . . . .
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# # # # #
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# # # # #
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. . . . .
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`)
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basic.showLeds(`
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. . . . .
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. . . . .
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. . . . .
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# # # # #
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# # # # #
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`)
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input.onButtonPressed(Button.A, () => {
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basic.clearScreen()
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})
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input.onButtonPressed(Button.B, () => {
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})
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```
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**Challenge 2**
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### @video td/videos/screen-wipe-2
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Replay the animation when the "B" button is pressed placing the `show LEDs` block on the canvas.
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```blocks
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basic.showLeds(`
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# # # # #
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# # # # #
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. . . . .
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. . . . .
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. . . . .
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`)
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basic.showLeds(`
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# # # # #
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# # # # #
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# # # # #
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# # # # #
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. . . . .
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`)
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basic.showLeds(`
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. . . . .
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. . . . .
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# # # # #
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# # # # #
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. . . . .
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`)
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basic.showLeds(`
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. . . . .
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. . . . .
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. . . . .
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# # # # #
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# # # # #
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`)
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input.onButtonPressed(Button.A, () => {
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basic.clearScreen()
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})
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input.onButtonPressed(Button.B, () => {
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basic.showLeds(`
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# # # # #
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# # # # #
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. . . . .
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. . . . .
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. . . . .
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`)
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basic.showLeds(`
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# # # # #
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# # # # #
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# # # # #
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# # # # #
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. . . . .
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`)
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basic.showLeds(`
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. . . . .
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. . . . .
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# # # # #
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# # # # #
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. . . . .
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`)
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basic.showLeds(`
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. . . . .
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. . . . .
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. . . . .
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# # # # #
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# # # # #
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`)
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})
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```
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**Challenge 3**
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Show an animation that scrolls back up when you press button "B".
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* tap the *run* button to view your final product!
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