JSFiddle - React, Tailwind, and code Playground

by velo_ninja

HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
  <title>Professional Canvas with Theme Switch</title>
  <style>
    html, body {
      margin: 0;
      padding: 0;
      overflow: hidden;
      height: 100%;
      background-color: var(--bg-color);
      transition: background-color 0.3s;
    }

    :root {
      --bg-color: #ffffff;
      --grid-light: rgba(0, 0, 0, 0.05);
      --grid-dark: rgba(0, 0, 0, 0.15);
      --text-color: #333;
      --shape-fill: #f5f5f5;
      --shape-border: #333;
    }

    .dark-mode {
      --bg-color: #121212;
      --grid-light: rgba(255, 255, 255, 0.05);
      --grid-dark: rgba(255, 255, 255, 0.15);
      --text-color: #e0e0e0;
      --shape-fill: #1e1e1e;
      --shape-border: #e0e0e0;
    }

    #stage {
      width: 100vw;
      height: 100vh;
      position: relative;
    }

    canvas {
      display: block;
      background-color: var(--bg-color);
      transition: background-color 0.3s;
    }

    .theme-toggle {
      position: absolute;
      top: 16px;
      right: 16px;
      background: #eee;
      border: none;
      padding: 10px 16px;
      border-radius: 20px;
      cursor: pointer;
      font-family: sans-serif;
      font-size: 14px;
      box-shadow: 0 2px 6px rgba(0,0,0,0.2);
      z-index: 10;
    }

    .dark-mode .theme-toggle {
      background: #333;
      color: #fff;
    }
  </style>
</head>
<body>
  <div id="stage">
    <canvas id="myCanvas"></canvas>
    <button class="theme-toggle" id="themeToggle">🌙 Dark</button>
  </div>

  <script>
    class Canvas {
      constructor(canvasId) {
        this.canvas = document.getElementById(canvasId);
        this.ctx = this.canvas.getContext('2d', { alpha: true });

        this.gridSize = 40;
        this.scale = 1;
        this.offsetX = 0;
        this.offsetY = 0;
       ...