npm package: 2d-collision
Description: 💥 A lightweight and customisable JavaScript library for simulating particle physics, including collisions, gravity, and mouse interactivity. Perfect for creating dynamic visual effects.
Author: Aly Shukry
Latest version: 1.2.0

# 💥 Particle Physics Simulation
![npm](https://img.shields.io/npm/v/2d-collision) ![license](https://img.shields.io/badge/license-MIT-blue.svg) ![downloads](https://img.shields.io/npm/dt/2d-collision)

A lightweight and customisable JavaScript library for simulating particle physics, including collisions, gravity, and mouse interactivity. Perfect for creating dynamic visual effects.

![Demo](demo.gif)
## 🚀 Installation:
### Option 1: via npm
```bash
npm install 2d-collision
```
## 🎮 Usage and Configuration
### Functions:
The library provides the following key functions:
- **`createParticle(radius, mass, element, container)`** – Creates a single particle and adds it to the simulation.

    - `radius`*`(number)`* – determines particle's size
    - `mass`*`(number)`* – determines particle's weight
    - `element`*`(string)`* – the HTML element that you'd like to turn into a particle
    - `container`*`(string)`* – the HTML element that you'd like to act as the container for the particle
- **`createParticles(radii, masses, elements, container)`** – Creates multiple particles at once.
- **`editParticles()`** – Modify properties of particles by selecting them via their class. Function provides the following arguments:
    - `particlesClass` *(string)* – The class of the HTML elements representing the particles.
    - `setVelX, setVelY` *(number)* – Sets the velocity of the particles along the X and Y axes.
    - `addVelX, addVelY` *(number)* – Adds to the current velocity of the particles along the X and Y axes.
    - `multiplyVelX, multiplyVelY` *(number)* – Multiplies the current velocity of the particles along the X and Y axes.
    - `setPosX, setPosY` *(number)* – Sets the position of the particles along the X and Y axes.
    - `addPosX, addPosY` *(number)* – Adds to the current position of the particles along the X and Y axes.
    - `multiplyPosX, multiplyPosY` *(number)* – Multiplies the current position of the particles along the X and Y axes.
    - `setRadii` *(number)* – Sets the radii of the particles.
    - `addRadii` *(number)* – Adds to the current radii of the particles.
    - `multiplyRadii` *(number)* – Multiplies the current radii of the particles.
    - `setMasses` *(number)* – Sets the masses of the particles.
    - `addMasses` *(number)* – Adds to the current masses of the particles.
    - `multiplyMasses` *(number)* – Multiplies the current masses of the particles.
<br>

Example:
```js
// Create a single particle
createParticle(10, 1, document.querySelector('#circle'), document.querySelector('#container'));

// Create multiple particles
createParticles(12, 3, document.querySelectorAll('.circle'), document.querySelector('#container'));

// Edit particles
editParticles({
    particlesClass: 'circle',
    setVelX: 5,
    addPosY: 10,
    multiplyRadii: 1.5
});
```
### Global Configuration:
The library includes several global settings to control particle behavior:
- **`Particle.acceleration`** *(Vector)* – Controls gravity direction.<br>
    *Default:* (0, 0.35)<br>
    ➜ *To edit values, assign like*: `Particle.acceleration.x = ...`, `Particle.acceleration.y = ...`
- **`Particle.collisionDamping`** *(number)* – Reduces velocity after collisions.<br>
    *Default:* 0.5
- **`Particle.enableCursorForce`** *(boolean)* – Enables or disables interactive forces from the cursor.<br>
    *Default:* true
- **`Particle.cursorForce`** *(number)* – Strength of the cursor's interactive force.<br>
    *Default:* 0.5
- **`Particle.containerPadding`** *(number)* – Sets padding around the container to prevent particles from touching edges.<br>
    *Default:* 0

<br>

**License:** MIT  
**Contributing:** Contributions welcome! Please feel free to submit a Pull Request.