pxt-calliope/olddocs/js/lessons/glowing-sword/activity.md

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2016-03-26 00:47:20 +01:00
# glowing sword activity
2016-04-02 01:22:47 +02:00
Make glowing sword.
2016-03-26 00:47:20 +01:00
### ~avatar avatar
### @video td/videos/glowing-sword-0
In this activity, we will learn how to fade in and out the screen to create a glowing animation. Let's get started!
### ~
Let's start by adding the code to display an image. Use `basic->plot image` to draw your favorite image.
```
basic.plotImage(`
. . . . #
# . . # .
. # # . .
. # # . .
# . . # .
`) // ***
```
We can control the brightness of the LED screen with code. That's just what we need to create a **glowing** animation: first we **fade out**, then **fade in**. Add a new line of code to **fade out** the screen.
```
basic.plotImage(`
. . . . #
# . . # .
. # # . .
. # # . .
# . . # .
`)
led.fadeOut(700) // ***
```
Run your script to make sure it works as expected then add another line of code to **fade in** the screen.
```
led.fadeIn(700)
```
Finally, add a `basic->forever` loop and move the fade out and fade in code into the forever to repeat the glow pattern.
```
basic.plotImage(`
. . . . #
# . . # .
. # # . .
. # # . .
# . . # .
`)
led.fadeOut(700) // ***
led.fadeIn(700) // ***
```
### ~avatar boothing
2016-04-13 17:27:45 +02:00
Excellent, you're ready to continue with the [challenges](/lessons/glowing-sword/challenges)!
2016-03-26 00:47:20 +01:00
### ~