77ed2ccfb1
* update pxt.json files * Fix button event enums fixes https://github.com/microsoft/pxt-calliope/issues/206 * Fix Safari CSS Rule for iOS app fixes https://github.com/microsoft/pxt-calliope/issues/205 * aprove preffered repos should fix https://github.com/microsoft/pxt-calliope/issues/167
75 lines
2.2 KiB
Markdown
75 lines
2.2 KiB
Markdown
# Coin Flipper
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## Introduction @unplugged
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Let's create a coin flipping program to simulate a real coin toss. We'll use icon images to represent a ``heads`` or ``tails`` result.
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## Step 1
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Get an ``||input:on button A pressed||`` block from the ``||input:Input||`` drawer in the toolbox. We'll put our coin flipping code in here.
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```blocks
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input.onButtonEvent(Button.A, input.buttonEventValue(ButtonEvent.Click), () => {
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})
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```
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## Step 2
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Grab an ``||logic:if else||`` block and set it inside ``||input:on button A pressed||``. Put a ``||Math:pick random true or false||`` into the ``||logic:if||`` as its condition.
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The ``||Math:pick random true or false||`` returns a random ``true`` or ``false`` value which we use to determine a ``heads`` or ``tails`` result for a coin toss.
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```blocks
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input.onButtonEvent(Button.A, input.buttonEventValue(ButtonEvent.Click), () => {
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if (Math.randomBoolean()) {
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} else {
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}
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})
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```
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## Step 3
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Now, put a ``||basic:show icon||`` block inside both the ``||logic:if||`` and the ``||logic:else||``. Pick images to mean ``heads`` and ``tails``.
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```blocks
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input.onButtonEvent(Button.A, input.buttonEventValue(ButtonEvent.Click), () => {
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if (Math.randomBoolean()) {
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basic.showIcon(IconNames.Skull)
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} else {
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basic.showIcon(IconNames.Square)
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}
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})
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```
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## Step 4
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Press button **A** in the simulator to try the coin toss code.
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## Step 5
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You can animate the coin toss to add the feeling of suspense. Place different ``||basic:show icon||`` blocks before the ``||logic:if||`` to show that the coin is flipping.
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```blocks
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input.onButtonEvent(Button.A, input.buttonEventValue(ButtonEvent.Click), () => {
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basic.showIcon(IconNames.Diamond)
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basic.showIcon(IconNames.SmallDiamond)
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basic.showIcon(IconNames.Diamond)
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basic.showIcon(IconNames.SmallDiamond)
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if (Math.randomBoolean()) {
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basic.showIcon(IconNames.Skull)
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} else {
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basic.showIcon(IconNames.Square)
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}
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})
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```
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## Step 6
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If you have a @boardname@, connect it to USB and click ``|Download|`` to transfer your code.
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## Step 7
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Press button **A** for a flip. Test your luck and guess ``heads`` or ``tails`` before the toss is over!
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