How to Make Pong in Scratch
Introduction
Pong is a classic video game that has been a staple of gaming for decades. It’s simple to understand, yet complex to master. In this article, we’ll guide you through the steps to create a basic Pong game in Scratch, a popular programming block-based game development environment.
Setting up Scratch
Before we begin, make sure you have Scratch installed on your computer. If you don’t have it, you can download it from the official Scratch website. Once you’ve installed Scratch, create a new project by clicking on the "Start" button and selecting "New Project".
Creating the Game Board
To start, we need to create a game board for our Pong game. We’ll add two paddles and a ball, which will bounce around the screen.
- Create a new game board:
- Go to the "Game Board" tab
- Click on the "Add block" button
- Type "Square" and select it
- Add three more blocks below the Square
- Create paddles:
- Click on the "Paddle" tab
- Click on the "Add block" button
- Type "Linear Motion" and select it
- Set the "Direction" to "Outward" and the "Speed" to 10 units
- Add two more blocks below the first paddle
- Create a ball:
- Click on the "Ball" tab
- Click on the "Add block" button
- Type "Spherical Shape" and select it
- Set the "Size" to 10 units
- Add the ball to the top-left corner of the game board
Adding Game Logic
Now that we have our game board set up, we need to add some game logic to make the game work. We’ll use the following rules to determine the outcome of the game:
- The ball must bounce off the edges of the game board
- The paddles must collide with the ball
- The paddles must keep the ball in their area
Here’s a list of the game logic we’ll use:
- Ball movement:
- Set the speed of the ball to 10 units
- Set the direction of the ball to "Outward"
- Paddle movement:
- Set the speed of the paddles to 5 units
- Set the direction of the paddles to "Outward"
- Collision detection:
- Use the Distance function to check if the ball is within the range of the paddles
- Use the Is Closer function to check if the ball is within the range of the paddles
- Paddle scoring:
- When a paddle misses the ball, reset the ball’s direction and speed
- When a paddle hits the ball, move the ball back to the center of the screen
Here’s the code to implement these rules:
-
Ball movement:
let ballSpeed = 10;
let ballDirection = "Outward";
let ballX = 10;
let ballY = 10;
let ballDiameter = 10; -
Paddle movement:
let paddleSpeed = 5;
let paddleDirection = "Outward";
let paddleX = 0;
let paddleY = 0; - Collision detection:
if (ballX + ballDiameter / 2 > paddleX + 10 && ballX - ballDiameter / 2 < paddleX + 10) {
// paddle is missing the ball
ballDirection = "Uppercase";
ballX = paddleX + 10;
ballY = paddleY;
}
if (ballY + ballDiameter / 2 > paddleY + 10 && ballY – ballDiameter / 2 < paddleY + 10) {
// paddle is hitting the ball
ballDirection = "Lowercase";
ballX = paddleX;
ballY = paddleY + 10;
}
* **Paddle scoring**:
```scratch
if (ballX > paddleX + 10 && ballX < paddleX + 20 && ballY > paddleY + 10 && ballY < paddleY + 20) {
// paddle hits the ball, reset ball direction and speed
ballDirection = "Uppercase";
ballX = paddleX + 10;
ballY = paddleY;
}Creating the Game Loop
To create the game loop, we need to set up a loop that continues to run until the game is over.
-
Game loop:
while (true) {
// clear the screen
clear();
// draw the game board
drawRectangle(0, 0, 200, 200);
// draw the paddles
drawRectangle(paddleX, paddleY, 10, 10);
// draw the ball
drawCircle(ballX, ballY, ballDiameter / 2);
// update the ball's position
ballX += ballSpeed;
ballY += ballDirection;
// check for collisions
if (ballX > 190 || ballX < 10) {
ballDirection = "Uppercase";
}
if (ballY > 190 || ballY < 10) {
ballDirection = "Lowercase";
}
// check for paddle collisions
if (ballX + ballDiameter / 2 > paddleX + 10 && ballX - ballDiameter / 2 < paddleX + 10) {
ballDirection = "Uppercase";
ballX = paddleX + 10;
ballY = paddleY;
}
if (ballY + ballDiameter / 2 > paddleY + 10 && ballY - ballDiameter / 2 < paddleY + 10) {
ballDirection = "Lowercase";
ballX = paddleX;
ballY = paddleY + 10;
}
// draw the paddle scoring
if (ballX > paddleX + 10 && ballX < paddleX + 20 && ballY > paddleY + 10 && ballY < paddleY + 20) {
// paddle hits the ball, reset ball direction and speed
ballDirection = "Uppercase";
ballX = paddleX + 10;
ballY = paddleY;
}
// display the game over message
if (ballX > 190 || ballX < 10 || ballY > 190 || ballY < 10) {
print("Game Over!");
break;
}
}
Adding Sound Effects
To add sound effects to our game, we need to add a sound block. We’ll use the built-in "Sound" block to play a beep sound when the ball hits the paddle.
-
Sound block:
let soundVolume = 0.5;
let soundSound = "beep";
let soundMutex = false; - Sound effects:
if (soundMutex) {
soundMutex = false;
playSound(soundSound, 200);
}
else {
soundMutex = true;
playSound(soundSound, 200);
}
Tips and Variations
Here are some tips and variations to make your Pong game more interesting:
- Add multiple balls: Create multiple balls and use the same collision detection rules.
- Use different ball sizes: Use different sizes for the balls and create more realistic collisions.
- Add sound effects for different game states: Create different sound effects for different game states, such as when the ball bounces off the edge of the screen or when a paddle misses the ball.
- Create a scoring system: Create a scoring system where players can earn points for each game they win.
Conclusion
Making a Pong game in Scratch is a great way to get started with game development. By following these steps, you can create a simple yet fun Pong game that can be played on any computer. Remember to experiment with different game logic, sound effects, and game mechanics to create a unique and engaging game. Happy coding!