pxt-microbit
Version:
micro:bit target for Microsoft MakeCode (PXT)
103 lines (74 loc) • 2.39 kB
Markdown
# 7 seconds game
### @explicitHints true
## Can you react at the right time? @unplugged
The goal of this game is press a button after **exactly** 7 seconds!
This game is inspired from the [flipping pancakes game](https://www.elecfreaks.com/blog/post/flipping-pancakes-microbit-game.html).
## {Step 1}
The player starts the timer by pressing button **A**. Add the code to run code when
``||input:button A is pressed||``.
```spy
input.onButtonPressed(Button.A, function () {
})
```
## {Step 2}
We need to remember the time when the button was pressed so that we can compute the elapsed
time later on. Add code to store the ``||input:running time||`` in a ``||variables:start||``
variable.
```spy
let start = 0
input.onButtonPressed(Button.A, function () {
// @highlight
start = input.runningTime()
})
```
## {Step 3}
Show something on the screen so that the user knows that the timer has started...
```spy
let start = 0
input.onButtonPressed(Button.A, function () {
start = input.runningTime()
// @highlight
basic.showIcon(IconNames.Chessboard)
})
```
## {Step 4}
The player stops the timer by pressing button **B**. Add another event to run code when
``||input:button B is pressed||``.
```spy
input.onButtonPressed(Button.B, function () {
})
```
## {Step 5}
Compute the elapsed time as ``||input:running time||`` ``||math:minus||`` ``||variables:start||`` and
store it in a new local variable (a variable only inside the event) called ``||variables:elapsed||``.
```spy
let start = 0
input.onButtonPressed(Button.B, function () {
// @highlight
let elapsed = input.runningTime() - start
})
```
## {Step 6}
Compute the ``||variables:score||`` of the game as the ``||math:absolute value||`` of the
``||math:difference||`` of ``||variables:elapsed||`` time from 7 seconds, which is `7000`
milliseconds.
```spy
let start = 0
input.onButtonPressed(Button.B, function () {
let elapsed = input.runningTime() - start
// @highlight
let score = Math.abs(elapsed - 7000)
})
```
## {Step 7}
Display the score on the screen and your game is ready!
```spy
let start = 0
input.onButtonPressed(Button.B, function () {
let elapsed = input.runningTime() - start
let score = Math.abs(elapsed - 7000)
// @highlight
basic.showNumber(score)
})
```