🏍️ Scroll Image Sequence

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📑 Table of Contents

• 🏍️ Scroll Image Sequence
  • 📑 Table of Contents
  • 📖 Description
  • ⚙️ System Requirements
  • 🔍 Verify Installation
  • 🚀 Project Installation
    • 1️⃣ Clone the repository
    • 2️⃣ Open the project
  • ▶️ Run the Project
  • 🧠 Project Architecture
    • 📦 Core Modules
      • Scroll Engine
      • Image Sequence System
      • Animation Controller
  • ✨ Features
  • 🛠 Technologies Used
  • 📁 Project Structure
  • 🔥 Best Practices Implemented
  • 🎯 Project Goal
  • 📄 License

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🌐 Live Demo

🔗 https://alobuuls.github.io/scroll-image-sequence/

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📖 Description

Note

Scroll Image Sequence is a browser-based animation project built with vanilla JavaScript.

The application creates a frame-by-frame animation controlled entirely by the user's scroll position, generating a smooth cinematic effect similar to those used in modern landing pages and product showcases.

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⚙️ System Requirements

Before running the project, make sure you have:

• 🌐 A modern web browser (Chrome, Firefox, Edge, Safari)
• 📦 Git (optional)

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🔍 Verify Installation

Check that Git is installed:

git --version

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🚀 Project Installation

1️⃣ Clone the repository

git clone git@github.com:alobuuls/scroll-image-sequence.git
cd scroll-image-sequence

2️⃣ Open the project

Important

No dependencies or package installation are required.

You can simply open:

index.html

or run the project using Live Server in Visual Studio Code.

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▶️ Run the Project

Open the index.html file directly in your browser or start a local development server.

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🧠 Project Architecture

Note

The application is built using vanilla JavaScript, CSS animations, and image sequence rendering.

📦 Core Modules

Scroll Engine

Responsible for:

• Tracking scroll position
• Calculating scroll progress
• Mapping scroll percentage to frames
• Updating rendered images

Image Sequence System

Handles:

• Frame loading
• Frame preloading
• Image switching
• Sequence synchronization

Animation Controller

Manages:

• Initial frame rendering
• Scroll restoration behavior
• Responsive recalculations
• Visual transitions

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✨ Features

• 🎬 Frame-by-frame image sequence animation
• 🖱️ Scroll-driven playback
• ⚡ Image preloading for smooth rendering
• 📱 Responsive behavior
• 🔄 Automatic frame synchronization
• 🚀 Fast image updates using CSS backgrounds
• 🎨 Intro logo animation
• 📈 Dynamic scroll-to-frame calculation
• 🧠 Optimized rendering by avoiding duplicate frame updates

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🛠 Technologies Used

Technology	Purpose
HTML5	Structure
CSS3	Styling
JavaScript (ES6+)	Logic
DOM API	DOM Manipulation
Intersection & Scroll Events	Scroll Handling
WebP Images	Optimized Frames

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📁 Project Structure

scroll-image-sequence/
├── index.html
├── styles.css
├── main.js
├── images/
│   ├── logo.png
│   ├── preview.gif
│   └── frames/
│       ├── moto-001.webp
│       ├── moto-002.webp
│       ├── ...
│       └── moto-151.webp
└── README.md

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🔥 Best Practices Implemented

• Separation of responsibilities
• Image preloading strategy
• Efficient frame rendering
• Scroll position normalization
• Responsive recalculation on resize
• Avoiding unnecessary DOM updates
• Reusable utility functions
• Clean and maintainable code structure

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🎯 Project Goal

Practice and strengthen advanced JavaScript concepts through a visual animation project:

• Scroll-based interactions
• Frame sequence animations
• Image preloading techniques
• DOM manipulation
• Event handling
• Performance optimization
• Responsive development
• Modern landing page effects

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📄 License

This project is intended for educational and portfolio purposes.

Created by Alondra Francisco.