grand-calculator System Requirements Document

Introduction

The "grand-calculator" project aims to develop a simple, user-friendly calculator for basic arithmetic operations. The focus is on a single-page design to ensure a seamless and straightforward user experience, catering to general everyday use.

System Overview

The grand-calculator will be a web-based application designed to perform basic arithmetic operations such as addition, subtraction, multiplication, and division. The application will be developed with a single-page design approach, ensuring that all functionalities are accessible without navigating away from the main interface. This design choice prioritizes simplicity and ease of use, making it suitable for a wide range of users, including students, professionals, and anyone needing quick mathematical calculations.

Functional Requirements

• As a User, I should be able to perform addition.
• As a User, I should be able to perform subtraction.
• As a User, I should be able to perform multiplication.
• As a User, I should be able to perform division.

User Personas

• General User: Individuals who need to perform basic arithmetic calculations quickly and efficiently. This includes students, professionals, and everyday users.

Visuals Colors and Theme

• primary: #4A90E2 (a calming blue for the main interface)
• primary_light: #A6C8F0 (a lighter blue for hover states and secondary UI elements)
• secondary: #F5A623 (a warm orange for headlines and emphasis)
• accent: #50E3C2 (a vibrant teal for call-to-action buttons and active states)
• highlight: #F8E71C (a bright yellow for hover states and notifications)
• bg: #FFFFFF (a clean white for the background)
• surface: rgba(74, 144, 226, 0.1) (a subtle blue tint for card/panel backgrounds)
• text: #333333 (a dark grey for primary text)
• text_muted: #777777 (a softer grey for secondary text and labels)
• border: rgba(74, 144, 226, 0.2) (a light blue for borders)

Signature Design Concept

The grand-calculator will feature an interactive "floating keypad" design. The calculator's buttons will appear to float above the background, casting subtle shadows to create a sense of depth. When a user hovers over a button, it will gently rise and change color, providing tactile feedback. The entire interface will be responsive, with buttons resizing smoothly to fit different screen sizes. This design will be implemented using framer-motion for smooth animations and transitions, ensuring an engaging and dynamic user experience.

Interaction Model & Motion Direction

The interaction model for the grand-calculator will be "animated." This will include hover transitions and spring physics on interactive elements like buttons. The single-page design will focus on clarity and responsiveness, with minimal motion to maintain a clean and efficient user interface.

Non-Functional Requirements

• The application must load within 2 seconds on a standard broadband connection.
• The interface should be responsive and accessible on all modern web browsers and devices.
• The application should handle up to 100 concurrent users without performance degradation.

Tech Stack

• Frontend: React for Web
• Backend: Python with FastAPI
• Database: Not required for this project as it is a simple calculator
• Local orchestration: Docker for containerization

Assumptions and Constraints

• The calculator will only perform basic arithmetic operations.
• The application will be a single-page design with no additional pages or complex navigation.
• The project will not include advanced mathematical functions or features.

Glossary

• Arithmetic Operations: Basic mathematical functions including addition, subtraction, multiplication, and division.
• Single-page Design: A web application design approach where all content is accessible on one page without the need for navigation to other pages.