Hadamard Matrix CSS Grid Display

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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Hadamard & Netmask CSS</title>
    <style>
        /*
         ============================================
         CSS Stylesheet using Hadamard & Netmask
         ============================================
        */

:root {
            /* 
             *  Color Palette inspired by the Netmask: 255.255.240.0
             *  We are using the numbers to define an RGB color for the light tones.
             *  The dark tone is a simple contrasting color.
            */
            --color-light: rgb(255, 255, 240);
            --color-dark: rgb(40, 40, 40);

/*
             * The size of our Hadamard Matrix (e.g., 4 for a 4x4 matrix)
            */
            --matrix-size: 4;
        }

body {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            margin: 0;
            background-color: #f0f0f0;
            font-family: sans-serif;
            text-align: center;
        }

.container {
            padding: 2rem;
        }

h1 {
            color: var(--color-dark);
            margin-bottom: 2rem;
        }

/*
         *  The main grid container for the Hadamard pattern.
         *  We use CSS Grid to create a layout that matches the matrix dimensions.
        */
        .hadamard-grid {
            display: grid;
            grid-template-columns: repeat(var(--matrix-size), 1fr);
            width: 300px;
            height: 300px;
            border: 3px solid var(--color-dark);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }

/*
         *  The individual cells of the grid.
        */
        .cell {
            width: 100%;
            height: 100%;
        }

/*
         *  Hadamard Matrix Pattern:
         *  A 4x4 Hadamard matrix looks like this:
         *  [+1, +1, +1, +1]
         *  [+1, -1, +1, -1]
         *  [+1, +1, -1, -1]
         *  [+1, -1, -1, +1]
         *
         *  We map '+1' to one color and '-1' to the other.
        */

.hadamard-plus {
            background-color: var(--color-light);
        }

.hadamard-minus {
            background-color: var(--color-dark);
        }

/* Responsive adjustments for smaller screens */
        @media (max-width: 600px) {
            .hadamard-grid {
                width: 80vw;
                height: 80vw;
            }
            h1 {
                font-size: 1.5rem;
            }
        }
    </style>
</head>
<body>

<div class="container">
        <h1>Hadamard Matrix Pattern</h1>
        <div class="hadamard-grid">
            
            <div class="cell hadamard-plus"></div>
            <div class="cell hadamard-plus"></div>
            <div class="cell hadamard-plus"></div>
            <div class="cell hadamard-plus"></div>

<div class="cell hadamard-plus"></div>
            <div class="cell hadamard-minus"></div>
            <div class="cell hadamard-plus"></div>
            <div class="cell hadamard-minus"></div>

<div class="cell hadamard-plus"></div>
            <div class="cell hadamard-plus"></div>
            <div class="cell hadamard-minus"></div>
            <div class="cell hadamard-minus"></div>

<div class="cell hadamard-plus"></div>
            <div class="cell hadamard-minus"></div>
            <div class="cell hadamard-minus"></div>
            <div class="cell hadamard-plus"></div>
        </div>
    </div>

</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Hadamard Matrix Display</title>
    <style>
        /* 
         * Using CSS variables to define the color palette for easy customization.
         * The light color is derived from the netmask (255.255.240.0).
        */
        :root {
            --bg-color: #111827; /* Dark background for the page */
            --card-color: #1F2937; /* Background of the card */
            --primary-text-color: #F9FAFB; /* White for the main title */
            --secondary-text-color: #9CA3AF; /* Muted gray for subtitles/labels */
            --hadamard-light: rgb(255, 255, 240); /* Light color from netmask */
            --hadamard-dark: #1F2937; /* Dark color, matching the card */
        }

/* Basic setup for the page to center the content */
        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            background-color: var(--bg-color);
            color: var(--primary-text-color);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 1rem;
            box-sizing: border-box;
        }

/* The main card container */
        .card {
            background-color: var(--card-color);
            border-radius: 1rem; /* 16px */
            padding: 2rem; /* 32px */
            width: 100%;
            max-width: 380px;
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2), 0 10px 10px -5px rgba(0, 0, 0, 0.1);
            display: flex;
            flex-direction: column;
            gap: 1.5rem; /* 24px space between header, grid, and footer */
        }

/* Header section with title and subtitle */
        .card-header {
            text-align: center;
        }

.title {
            font-size: 2.25rem; /* 36px */
            font-weight: 700;
            margin: 0;
        }

.subtitle {
            font-size: 1.125rem; /* 18px */
            color: var(--secondary-text-color);
            margin: 0.25rem 0 0 0;
            font-weight: 400;
        }

/* The 4x4 grid container */
        .hadamard-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            aspect-ratio: 1 / 1; /* Ensures the grid is always a perfect square */
            width: 100%;
        }

/* Individual cells in the grid */
        .cell-light {
            background-color: var(--hadamard-light);
        }

.cell-dark {
            background-color: var(--hadamard-dark);
        }

/* Footer section with netmask info and color swatch */
        .card-footer {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 0.75rem; /* 12px */
        }

.netmask-label {
            font-size: 0.875rem; /* 14px */
            color: var(--secondary-text-color);
        }

.color-swatch {
            width: 1rem; /* 16px */
            height: 1rem; /* 16px */
            background-color: var(--hadamard-light);
            border-radius: 50%; /* Makes it a circle */
            border: 1px solid rgba(0, 0, 0, 0.2);
        }
    </style>
</head>
<body>

<div class="card">
        <header class="card-header">
            <h1 class="title">Hadamard Matrix</h1>
            <p class="subtitle">4x4</p>
        </header>

<footer class="card-footer">
            <span class="netmask-label">Netmask: 255.255.240.0</span>
            <div class="color-swatch"></div>
        </footer>
    </div>

</body>
</html>

CSS

JS

class TodosScreen extends StatelessWidget {
  // Requiring the list of todos.
  const TodosScreen({super.key, required this.todos});

final List<Todo> todos;

@override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Todos')),
      //passing in the ListView.builder
      body: ListView.builder(
        itemCount: todos.length,
        itemBuilder: (context, index) {
          return ListTile(title: Text(todos[index].title));
        },
      ),
    );
  }
}
class DetailScreen extends StatelessWidget {
  // In the constructor, require a Todo.
  const DetailScreen({super.key, required this.todo});

// Declare a field that holds the Todo.
  final Todo todo;

@override
  Widget build(BuildContext context) {
    // Use the Todo to create the UI.
    return Scaffold(
      appBar: AppBar(title: Text(todo.title)),
      body: Padding(
        padding: const EdgeInsets.all(16),
        child: Text(todo.description),
      ),
    );
  }
}
/body: ListView.builder(
  itemCount: todos.length,
  itemBuilder: (context, index) {
    return ListTile(
      title: Text(todos[index].title),
      // When a user taps the ListTile, navigate to the DetailScreen.
      // Notice that you're not only creating a DetailScreen, you're
      // also passing the current todo through to it.
      onTap: () {
        Navigator.push(
          context,
          MaterialPageRoute<void>(
            builder: (context) => DetailScreen(todo: todos[index]),
          ),
        );
      },
    );
  },
),
import 'package:flutter/material.dart';

class Todo {
  final String title;
  final String description;

const Todo(this.title, this.description);
}

void main() {
  runApp(
    MaterialApp(
      title: 'Passing Data',
      home: TodosScreen(
        todos: List.generate(
          20,
          (i) => Todo(
            'Todo $i',
            'A description of what needs to be done for Todo $i',
          ),
        ),
      ),
    ),
  );
}

class TodosScreen extends StatelessWidget {
  const TodosScreen({super.key, required this.todos});

final List<Todo> todos;

@override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Todos')),
      body: ListView.builder(
        itemCount: todos.length,
        itemBuilder: (context, index) {
          return ListTile(
            title: Text(todos[index].title),
            // When a user taps the ListTile, navigate to the DetailScreen.
            // Notice that you're not only creating a DetailScreen, you're
            // also passing the current todo through to it.
            onTap: () {
              Navigator.push(
                context,
                MaterialPageRoute<void>(
                  builder: (context) => DetailScreen(todo: todos[index]),
                ),
              );
            },
          );
        },
      ),
    );
  }
}

class DetailScreen extends StatelessWidget {
  // In the constructor, require a Todo.
  const DetailScreen({super.key, required this.todo});

// Declare a field that holds the Todo.
  final Todo todo;

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