Created
July 7, 2024 21:04
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A simple web app showing how to create a spirograph with just html and javascript using SVG and line elements
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | |
| <title>Spirograph</title> | |
| <link rel="preconnect" href="https://fonts.googleapis.com" /> | |
| <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin /> | |
| <link | |
| href="https://fonts.googleapis.com/css2?family=Nunito:ital,wght@0,200..1000;1,200..1000&display=swap" | |
| rel="stylesheet" | |
| /> | |
| <style> | |
| body { | |
| font-family: "Nunito", sans-serif; | |
| font-optical-sizing: auto; | |
| background-color: black; | |
| display: flex; | |
| justify-content: center; | |
| align-items: center; | |
| height: 100vh; | |
| margin: 0; | |
| } | |
| svg { | |
| border: 1px solid white; | |
| } | |
| .mainH { | |
| color: white; | |
| text-align: center; | |
| } | |
| a { | |
| color: lightblue; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="container"> | |
| <h1 class="mainH"> | |
| Follow on <a target="_blank" href="https://github.com/ahsanayaz">GitHub</a> | |
| </h1> | |
| <svg id="drawing" width="600" height="600"></svg> | |
| </div> | |
| <script> | |
| const svg = document.getElementById("drawing"); | |
| const colors = ["red", "yellow", "blue", "green", "purple", "orange"]; | |
| let angle = 0; | |
| let x = 300, | |
| y = 300; | |
| let i = 0; | |
| function drawStep() { | |
| if (i >= 300) return; | |
| const color = colors[i % 6]; | |
| const length = i * 2; | |
| const x1 = x + length * Math.cos((angle * Math.PI) / 180); | |
| const y1 = y + length * Math.sin((angle * Math.PI) / 180); | |
| const line = document.createElementNS( | |
| "http://www.w3.org/2000/svg", | |
| "line" | |
| ); | |
| line.setAttribute("x1", x); | |
| line.setAttribute("y1", y); | |
| line.setAttribute("x2", x1); | |
| line.setAttribute("y2", y1); | |
| line.setAttribute("stroke", color); | |
| line.setAttribute("stroke-width", 2); | |
| svg.appendChild(line); | |
| x = x1; | |
| y = y1; | |
| angle += 61; | |
| i++; | |
| setTimeout(drawStep, 50); // 50 milliseconds delay | |
| } | |
| drawStep(); | |
| </script> | |
| </body> | |
| </html> |
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