Created
December 31, 2018 22:41
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| const { min, cos, sin, PI, sqrt, ceil } = Math | |
| const canvas = document.createElement('canvas') | |
| const sqrt3 = sqrt(3) | |
| const size = min(document.body.clientWidth, document.body.clientHeight * 1.5 / sqrt3) * 4 / 5 | |
| canvas.width = size | |
| canvas.height = ceil(size * 2 * sqrt3 / 3) | |
| document.body.appendChild(canvas) | |
| const c = canvas.getContext('2d') | |
| c.strokeStyle = '#fff' | |
| let segments = [ | |
| [[0, sqrt3 / 2 * size], [size / 2, 0]], | |
| [[size / 2, 0], [size, sqrt3 / 2 * size]], | |
| [[size, sqrt3 / 2 * size], [0, sqrt3 / 2 * size]] | |
| ] | |
| const length = ([[x1, y1], [x2, y2]]) => Math.hypot(x1 - x2, y1 - y2) | |
| const drawSegment = ([[x1, y1], [x2, y2]]) => { | |
| c.beginPath() | |
| c.lineTo(x1, y1) | |
| c.lineTo(x2, y2) | |
| c.stroke() | |
| } | |
| const split = ([[x1, y1], [x2, y2]]) => { | |
| const [vx, vy] = [(x2 - x1) / 3, (y2 - y1) / 3] | |
| const [rvx, rvy] = [vx * cos(-PI / 3) - vy * sin(-PI / 3), vx * sin(-PI / 3) + vy * cos(-PI / 3)] | |
| const a = [x1 + vx, y1 + vy], b = [x1 + rvx + vx, y1 + rvy + vy], c = [x2 - vx, y2 - vy] | |
| return [[[x1, y1], a], [a, b], [b, c], [c, [x2, y2]]] | |
| } | |
| segments.forEach(drawSegment) | |
| const update = () => { | |
| c.clearRect(0, 0, canvas.width, canvas.height) | |
| segments = segments.reduce((acc, x) => [...acc, ...split(x)], []) | |
| segments.forEach(drawSegment) | |
| } | |
| setInterval(() => length(segments[0]) > 1 ? update() : null, 500) |
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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"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <meta name="theme-color" content="#000"> | |
| <title>Snowflake</title> | |
| </head> | |
| <body style="display: flex; justify-content: center; align-items: center; margin: 0;background-color: #000;height: 100vh"> | |
| <script src="main.js"></script> | |
| </body> | |
| </html> |
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