If you’ve ever wondered how simple 2D games, interactive animations, or playful websites are built, JavaScript is one of the best languages to start with. This tutorial walks you through the basics of JavaScript in a fun, visual way by focusing on game‑style concepts: sprites, movement, collisions, input, and more.
This guide is ideal for beginners and great for students learning programming for entertainment.
1. Introduction to Animation and Games
Before diving into code, understand what JavaScript can do:
• Create animations
• Build interactive buttons and characters
• Respond to keyboard and mouse input
• Detect collisions between objects
• Power full games in the browser
JavaScript runs directly inside your web browser, making learning fast and accessible.
Introduction to JavaScript
JavaScript is a language that lets you change things on a webpage over time.
For example:
console.log("Hello world!");
This prints a message and is often the first line every new programmer writes.
Programming for Entertainment
In game programming, the goal is not only for the code to work—but to be fun.
Expect to experiment, try ideas, and play with visuals.
2. Shapes and Randomization
Start with simple shapes—the building blocks of animation.
Example using the p5.js library:
circle(200, 200, 50);
Randomization adds unpredictability:
let x = random(0, 400);
circle(x, 200, 50);
Every reload gives a new location.
3. Variables
Variables store information the computer remembers.
let score = 0;
let playerX = 100;
You can change their values over time—an essential part of animation.
4. Sprites
Sprites are images or characters in your game.
In p5.play:
let player = createSprite(200, 200, 50, 50);
This creates a character you can move or animate.
5. Draw Loop
Games update dozens of times per second.
A draw loop is where this constant updating happens.
function draw() {
background(220);
drawSprites();
}
This loop makes the game feel alive.
6. Sprite Movement
To move a sprite:
player.position.x += 2;
This moves the character to the right every frame.
The Counter Pattern
Increasing a value step-by-step is called the counter pattern:
counter = counter + 1;
This is used for scrolling, increasing difficulty, scoring, and movement.
7. Booleans and Conditionals
Booleans
A boolean represents true or false:
let isGameOver = false;
Conditionals
Conditionals allow the game to make decisions:
if (player.position.x > 400) {
isGameOver = true;
}
These rules shape gameplay.
8. Keyboard Input
Let the player control the game:
if (keyDown("left")) {
player.position.x -= 3;
}
Keyboard input adds interactivity and fun.
9. Other Forms of Input
You can also use:
• Mouse clicks
• Touch input
• On-screen buttons
• Motion sensors (on mobile)
Example:
if (mouseIsPressed) {
player.position.x = mouseX;
}
10. Velocity
Velocity controls automatic movement:
player.velocity.x = 2;
The sprite now moves by itself without needing keyboard input.
11. Collision Detection
Games need to know when two objects touch:
player.overlap(enemy, gameOver);
Collision detection allows:
• Catching items
• Avoiding obstacles
• Triggering events
12. Complex Sprite Movement
By combining velocity + the counter pattern, you can create advanced motion:
player.velocity.y += 0.5; // like gravity
This is the basis for platformer games.
13. Collisions & Sprite Interactions
You can define what happens when two sprites meet:
if (player.collide(wall)) {
player.velocity.x = 0;
}
This allows walls, floors, enemies, and interactive objects.
14. Functions
Functions help organize your game:
function movePlayer() {
if (keyDown("right")) {
player.position.x += 3;
}
}
Call functions inside your draw loop to keep things tidy.
15. The Game Design Process
Creating a game is more than just coding. The steps are:
• Brainstorm
• Plan
• Prototype
• Test
• Improve
• Finish
16. Using the Game Design Process
Let’s apply it to a simple project: “Catch the Fruit”
- Idea: Move a basket and catch falling fruit.
- Plan: One player sprite, many falling sprites, scoring system.
- Prototype: Program basic movement and falling.
- Test: Try different speeds and sizes.
- Improve: Add sound, levels, visuals.
- Finish: Publish or share your game.
Conclusion
By learning these JavaScript basics—shapes, variables, sprites, movement, collisions, and input—you suddenly gain the power to build your own interactive experiences. Whether you're making fun animations, simple arcade games, or bigger creative projects, the journey begins with these foundations.
Best Regards,
Roneda Osmani
