88 lines
1.8 KiB
Markdown
88 lines
1.8 KiB
Markdown
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# pong quiz answers
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create the game Pong #LED #number #math #acceleration #docs
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## Name
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## Directions
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Use this activity document to guide your work in the [pong tutorial](/microbit/lessons/pong/tutorial)
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Answer the questions while completing the tutorial. Pay attention to the dialogues!
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## 1. Create two variables that will keep track of the x-position and y-position of the ball, and assign the variables to their initial values.
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<br/>
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```
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ballX = 2
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ballY = 1
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```
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## 2. Create two variables that keeps track of the velocity (or the speed and direction) of the ball, and assign the variables to their initial values.
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<br/>
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```
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ballXVelocity = 1
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ballYVelocity = 1
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```
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## 3. Write the code that plots the initial position of the paddle and the ball.
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<br/>
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```
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led.plot(0, paddleY)
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led.plot(ballX, ballY)
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```
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## 4. Write the code that moves the paddle up when Button A is pressed. (Don't worry about setting 'game running' to true.)
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<br/>
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```
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input.onButtonPressed("A", () => {
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if (paddleNotUp()) {
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led.unplot(0, paddleY)
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paddleY = paddleY - 1
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led.plot(0, paddleY)
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}
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})
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```
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## 5. Write the code that moves the paddle up when Button B is pressed. (Don't worry about setting 'game running' to true.)
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<br/>
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```
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input.onButtonPressed("A", () => {
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if (paddleNotDown()) {
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led.unplot(0, paddleY)
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paddleY = paddleY + 1
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led.plot(0, paddleY)
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}
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})
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```
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## 6. Write the code to update the y-velocity. (Hint: look at the function "update y velocity".)
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<br/>
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```
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if (ballY == 4 || ballY == 0) {
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ballYVelocity = (-1) * ballYVelocity
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}
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```
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## 7. Write the code to move the ball. (Hint: look at the function "move ball".)
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<br/>
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```
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led.unplot(ballX, ballY)
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ballX = ballX + ballXVelocity
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ballY = ballY + ballYVelocity
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```
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