66 lines
1.8 KiB
Markdown
66 lines
1.8 KiB
Markdown
# pong activity
|
|
|
|
Building a game of pong with sprites.
|
|
|
|
### ~avatar avatar
|
|
|
|
### @video td/videos/pong-0
|
|
|
|
Welcome! This tutorial will teach you how to build a simple pong game using sprites.
|
|
|
|
### ~
|
|
|
|
The game works as follow: the user moves a paddle on the left of the screen and a ball bounces on the other side. Let's start by creating the 2 sprites.
|
|
|
|
```
|
|
let paddle = game.createSprite(0, 2)
|
|
let ball = game.createSprite(4, 2)
|
|
```
|
|
|
|
Let's make the ball start with an angle.
|
|
|
|
```
|
|
ball.setDirection(-45)
|
|
```
|
|
|
|
The user will control the paddle by pressing ``A`` to go up and ``B`` to go down. Let's add ``on button pressed`` event handlers to do that.
|
|
|
|
```
|
|
input.onButtonPressed(Button.A, () => {
|
|
paddle.changeYBy(-1)
|
|
})
|
|
input.onButtonPressed(Button.B, () => {
|
|
paddle.changeYBy(1)
|
|
})
|
|
```
|
|
|
|
Let's add a ``forever`` loop to start the main game logic.
|
|
|
|
```
|
|
basic.forever(() => {
|
|
// Leave the sprite on screen for a little while.
|
|
basic.pause(400)
|
|
// Let's move the ball in whatever direction it is currently going.
|
|
ball.move(1)
|
|
// The ball might be on the left side of the screen (``x = 0``), let's test for that.
|
|
if (ball.x() == 0) {
|
|
// Let's add a little pause to let the user know that the ball is on the side.
|
|
basic.pause(400)
|
|
// If the paddle is not at the same ``y`` coordinate, it missed the ball and we can trigger a game over. If not, we add a point to the score.
|
|
if (paddle.y() != ball.y()) {
|
|
game.gameOver()
|
|
} else {
|
|
game.addScore(1)
|
|
basic.pause(500)
|
|
}
|
|
}
|
|
// The ball moved and might be on a side, let's make sure it bounces.
|
|
ball.ifOnEdge_Bounce()
|
|
// If the ball is on the left side, slide it forward to change slightly the bouncing mechanics.
|
|
if (ball.x() == 0) {
|
|
ball.changeXBy(1)
|
|
}
|
|
})
|
|
```
|
|
|