206 lines
4.5 KiB
Markdown
206 lines
4.5 KiB
Markdown
# Rock Paper Scissors
|
||
|
||
### ~avatar avatar
|
||
|
||
Build a Rock Paper Scissors game with the @boardname@! You can play
|
||
the game with a friend who has it on a @boardname@. You can also play
|
||
it with friends who are just using their hands. (The game is built
|
||
like a coin flipper, but with three choices instead of two.)
|
||
|
||
### ~
|
||
|
||
## Step 1: Getting started
|
||
|
||
We want the @boardname@ to choose rock, paper, or scissors when you
|
||
shake it. Try creating an ``on shake`` block so when you shake the
|
||
@boardname@, it will run part of a program.
|
||
|
||
Clear up the blocks and add the blocks below.
|
||
|
||
```blocks
|
||
input.onGesture(Gesture.Shake, () => {
|
||
|
||
})
|
||
```
|
||
|
||
Next, when you shake the @boardname@, it should pick a random number from `0` to `2`
|
||
and store it in the variable `item`.
|
||
|
||
Add a ``set`` block with a variable. Then add a ``pick random`` block,
|
||
and store the random number in the variable,
|
||
like this:
|
||
|
||
```blocks
|
||
input.onGesture(Gesture.Shake, () => {
|
||
let item = Math.random(3)
|
||
})
|
||
|
||
```
|
||
|
||
### ~hint
|
||
No one can predict random numbers. That's what makes them great for Rock Paper Scissors!
|
||
### ~
|
||
|
||
Each possible number these blocks can make (`0`, `1`, or `2`) means a different picture.
|
||
We will show the right picture for that number on the LED screen.
|
||
|
||
|
||
## Step 2: Picking paper
|
||
|
||
Put an ``if`` block after the ``let`` block that checks whether
|
||
`item` is `0`. Make sure the ``if`` block has an ``else if`` part
|
||
and an ``else`` part.
|
||
|
||
Next, add a ``show leds`` block that shows a
|
||
picture of a piece of paper:
|
||
|
||
```blocks
|
||
input.onGesture(Gesture.Shake, () => {
|
||
let item = Math.random(3)
|
||
if (item == 0) {
|
||
basic.showLeds(`
|
||
# # # # #
|
||
# . . . #
|
||
# . . . #
|
||
# . . . #
|
||
# # # # #
|
||
`)
|
||
} else if (false) {
|
||
|
||
} else {
|
||
|
||
}
|
||
})
|
||
```
|
||
|
||
## Step 3: A random rock
|
||
|
||
Now we are going to add a new picture for the @boardname@ to show
|
||
when another random number comes up.
|
||
|
||
Make the ``else if`` part check if the variable `item` is `1`.
|
||
Then add a ``show leds`` block with a picture of a rock.
|
||
|
||
```blocks
|
||
input.onGesture(Gesture.Shake, () => {
|
||
let item = Math.random(3)
|
||
if (item == 0) {
|
||
basic.showLeds(`
|
||
# # # # #
|
||
# . . . #
|
||
# . . . #
|
||
# . . . #
|
||
# # # # #
|
||
`)
|
||
} else if (item == 1) {
|
||
basic.showLeds(`
|
||
. . . . .
|
||
. # # # .
|
||
. # # # .
|
||
. # # # .
|
||
. . . . .
|
||
`)
|
||
} else {
|
||
|
||
}
|
||
})
|
||
```
|
||
|
||
## Step 4: Suddenly scissors
|
||
|
||
Add a ``show leds`` block with a picture of scissors to the ``else`` part:
|
||
|
||
```blocks
|
||
input.onGesture(Gesture.Shake, () => {
|
||
let item = Math.random(3)
|
||
if (item == 0) {
|
||
basic.showLeds(`
|
||
# # # # #
|
||
# . . . #
|
||
# . . . #
|
||
# . . . #
|
||
# # # # #
|
||
`)
|
||
|
||
} else if (item == 1) {
|
||
basic.showLeds(`
|
||
. . . . .
|
||
. # # # .
|
||
. # # # .
|
||
. # # # .
|
||
. . . . .
|
||
`)
|
||
} else {
|
||
basic.showLeds(`
|
||
# # . . #
|
||
# # . # .
|
||
. . # . .
|
||
# # . # .
|
||
# # . . #
|
||
`)
|
||
}
|
||
})
|
||
|
||
```
|
||
|
||
### ~hint
|
||
|
||
You don't need to check if `item` is `2` because `2` is the only number left out of `0`, `1`, and `2`.
|
||
That's why you can use an ``else`` instead of an ``else if``.
|
||
|
||
### ~
|
||
|
||
Your game is ready!
|
||
|
||
Click **Download** to move your program to the @boardname@!
|
||
|
||
Have fun!
|
||
|
||
## Step 5: Are you the greatest?
|
||
|
||
Here is a way you can make your Rock Paper Scissors game better.
|
||
When button ``A`` is pressed,
|
||
the @boardname@ will add `1` to your score.
|
||
|
||
Open the ``Game`` drawer, and then add the block ``change score by 1`` to your program,
|
||
like this:
|
||
|
||
```blocks
|
||
input.onButtonPressed(Button.A, () => {
|
||
game.addScore(1)
|
||
})
|
||
|
||
```
|
||
|
||
## Step 6: Prove you're the greatest!
|
||
|
||
After your @boardname@ can add `1` to the score, show how many wins you have.
|
||
|
||
```blocks
|
||
input.onButtonPressed(Button.A, () => {
|
||
game.addScore(1)
|
||
basic.showString("WINS:")
|
||
basic.showNumber(game.score())
|
||
})
|
||
```
|
||
## Step 7: Staying honest
|
||
|
||
Success! Your @boardname@ can track wins!
|
||
But what about losses?
|
||
Use the ``Game`` drawer to subtract `1` from your score when you press button `B`.
|
||
|
||
Here are all the blocks you will need:
|
||
|
||
```shuffle
|
||
input.onButtonPressed(Button.B, () => {
|
||
game.addScore(-1)
|
||
basic.showString("LOSSES:")
|
||
basic.showNumber(game.score())
|
||
})
|
||
```
|
||
Click **Download** to move your program to the @boardname@!
|
||
|
||
### ~button /projects
|
||
NEXT: PROJECTS!
|
||
### ~
|