172 lines
4.5 KiB
Markdown
172 lines
4.5 KiB
Markdown
# Rock Paper Scissors
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## Introduction @unplugged
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
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Use the accelerometer and the screen to build a **Rock Paper Scissors** game that you can play with your friends!
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## Step 1 @fullscreen
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Add a ``||input:on shake||`` block to run code when you shake the @boardname@.
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```blocks
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input.onGesture(Gesture.Shake, () => {
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})
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```
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## Step 2 @fullscreen
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Add a ``hand`` variable and place the ``||variables:set hand to||`` block in the shake event.
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
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## Step 3 @fullscreen
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Add a ``||math:pick random||`` block to pick a random number from `1` to `3` and store it in the variable named ``hand``.
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```blocks
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let hand = 0;
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input.onGesture(Gesture.Shake, () => {
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hand = Math.randomRange(1, 3)
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})
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```
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In a later step, each of the possible numbers (`1`, `2`, or `3`) is matched to its own picture. The picture is shown on the LEDs when its matching number is picked.
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## Step 4 @fullscreen
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Place an ``||logic:if||`` block under the ``||math:pick random||`` and check whether ``hand`` is equal to ``1``. Add a ``||basic:show leds||`` block that shows a picture of a piece of paper. The number `1` will mean paper.
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
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```blocks
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let hand = 0;
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input.onGesture(Gesture.Shake, () => {
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hand = Math.randomRange(1, 3)
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if (hand == 1) {
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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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```
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## Step 5 @fullscreen
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Click on the **SHAKE** button in the simulator. If you try enough times, you should see a picture of paper on the screen.
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
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## Step 6 @fullscreen
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Click the **(+)** button to add an ``||logic:else||`` section.
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
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```blocks
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let hand = 0;
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input.onGesture(Gesture.Shake, () => {
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hand = Math.randomRange(1, 3)
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if (hand == 1) {
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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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} else {
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}
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})
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```
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## Step 7 @fullscreen
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Add a ``||basic:show leds||`` block inside the ``||logic:else||``. Make a picture of a scissors in the LEDs.
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```blocks
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let hand = 0;
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input.onGesture(Gesture.Shake, () => {
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hand = Math.randomRange(1, 3)
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if (hand == 1) {
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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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} else {
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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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```
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## Step 8 @fullscreen
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Click the ``+`` button again to add an ``||logic:else if||`` section. Now, add a conditional block for ``||logic:hand = 2||`` to the condition in ``||logic:else if||``. Since ``hand`` can only be `1`, `2`, or `3`, your code is covering all possible cases!
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
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## Step 9 @fullscreen
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Get one more ``||basic:show leds||`` block and put it in the ``||logic:else if||``. Make a picture of a rock in the LEDs.
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```blocks
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let hand = 0;
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input.onGesture(Gesture.Shake, () => {
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hand = Math.randomRange(1, 3)
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if (hand == 1) {
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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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} else if (hand == 2) {
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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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} else {
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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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```
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## Step 10 @fullscreen
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Click on the **SHAKE** button in the simulator and check to see that each image is showing up.
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
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## Step 11 @fullscreen
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If you have a @boardname@, click on ``|Download|`` and follow the instructions to get the code
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onto your @boardname@. Your game is ready! Gather your friends and play Rock Paper Scissors!
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
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