Design: neues Login (weiss, Logo, Code-Schritte), Glitch-Hintergrund entfernt
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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ClaudeandClaude Sonnet 5.5 committed
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import { useRef, useEffect } from 'react';
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const LetterGlitch = ({
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glitchColors = ['#2b4539', '#61dca3', '#61b3dc'],
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className = '',
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glitchSpeed = 50,
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centerVignette = false,
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outerVignette = true,
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smooth = true,
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characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$&*()-_+=/[]{};:<>.,0123456789'
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}) => {
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const canvasRef = useRef(null);
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const animationRef = useRef(null);
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const letters = useRef([]);
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const grid = useRef({ columns: 0, rows: 0 });
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const context = useRef(null);
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const lastGlitchTime = useRef(Date.now());
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const lettersAndSymbols = Array.from(characters);
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const fontSize = 16;
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const charWidth = 10;
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const charHeight = 20;
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const getRandomChar = () => {
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return lettersAndSymbols[Math.floor(Math.random() * lettersAndSymbols.length)];
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};
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const getRandomColor = () => {
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return glitchColors[Math.floor(Math.random() * glitchColors.length)];
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};
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const hexToRgb = hex => {
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const shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
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hex = hex.replace(shorthandRegex, (m, r, g, b) => {
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return r + r + g + g + b + b;
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});
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const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
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return result
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? {
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r: parseInt(result[1], 16),
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g: parseInt(result[2], 16),
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b: parseInt(result[3], 16)
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}
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: null;
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};
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const interpolateColor = (start, end, factor) => {
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const result = {
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r: Math.round(start.r + (end.r - start.r) * factor),
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g: Math.round(start.g + (end.g - start.g) * factor),
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b: Math.round(start.b + (end.b - start.b) * factor)
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};
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return `rgb(${result.r}, ${result.g}, ${result.b})`;
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};
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const calculateGrid = (width, height) => {
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const columns = Math.ceil(width / charWidth);
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const rows = Math.ceil(height / charHeight);
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return { columns, rows };
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};
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const initializeLetters = (columns, rows) => {
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grid.current = { columns, rows };
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const totalLetters = columns * rows;
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letters.current = Array.from({ length: totalLetters }, () => ({
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char: getRandomChar(),
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color: getRandomColor(),
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targetColor: getRandomColor(),
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colorProgress: 1
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}));
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};
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const resizeCanvas = () => {
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const canvas = canvasRef.current;
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if (!canvas) return;
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const parent = canvas.parentElement;
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if (!parent) return;
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const dpr = window.devicePixelRatio || 1;
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const rect = parent.getBoundingClientRect();
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canvas.width = rect.width * dpr;
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canvas.height = rect.height * dpr;
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canvas.style.width = `${rect.width}px`;
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canvas.style.height = `${rect.height}px`;
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if (context.current) {
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context.current.setTransform(dpr, 0, 0, dpr, 0, 0);
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}
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const { columns, rows } = calculateGrid(rect.width, rect.height);
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initializeLetters(columns, rows);
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drawLetters();
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};
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const drawLetters = () => {
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if (!context.current || letters.current.length === 0) return;
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const ctx = context.current;
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const { width, height } = canvasRef.current.getBoundingClientRect();
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ctx.clearRect(0, 0, width, height);
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ctx.font = `${fontSize}px monospace`;
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ctx.textBaseline = 'top';
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letters.current.forEach((letter, index) => {
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const x = (index % grid.current.columns) * charWidth;
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const y = Math.floor(index / grid.current.columns) * charHeight;
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ctx.fillStyle = letter.color;
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ctx.fillText(letter.char, x, y);
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});
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};
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const updateLetters = () => {
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if (!letters.current || letters.current.length === 0) return;
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const updateCount = Math.max(1, Math.floor(letters.current.length * 0.05));
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for (let i = 0; i < updateCount; i++) {
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const index = Math.floor(Math.random() * letters.current.length);
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if (!letters.current[index]) continue;
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letters.current[index].char = getRandomChar();
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letters.current[index].targetColor = getRandomColor();
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if (!smooth) {
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letters.current[index].color = letters.current[index].targetColor;
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letters.current[index].colorProgress = 1;
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} else {
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letters.current[index].colorProgress = 0;
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}
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}
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};
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const handleSmoothTransitions = () => {
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let needsRedraw = false;
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letters.current.forEach(letter => {
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if (letter.colorProgress < 1) {
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letter.colorProgress += 0.05;
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if (letter.colorProgress > 1) letter.colorProgress = 1;
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const startRgb = hexToRgb(letter.color);
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const endRgb = hexToRgb(letter.targetColor);
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if (startRgb && endRgb) {
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letter.color = interpolateColor(startRgb, endRgb, letter.colorProgress);
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needsRedraw = true;
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}
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}
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});
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if (needsRedraw) {
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drawLetters();
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}
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};
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const animate = () => {
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const now = Date.now();
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if (now - lastGlitchTime.current >= glitchSpeed) {
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updateLetters();
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drawLetters();
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lastGlitchTime.current = now;
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}
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if (smooth) {
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handleSmoothTransitions();
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}
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animationRef.current = requestAnimationFrame(animate);
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};
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useEffect(() => {
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const canvas = canvasRef.current;
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if (!canvas) return;
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context.current = canvas.getContext('2d');
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resizeCanvas();
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animate();
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let resizeTimeout;
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const handleResize = () => {
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clearTimeout(resizeTimeout);
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resizeTimeout = setTimeout(() => {
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cancelAnimationFrame(animationRef.current);
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resizeCanvas();
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animate();
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}, 100);
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};
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window.addEventListener('resize', handleResize);
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return () => {
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cancelAnimationFrame(animationRef.current);
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window.removeEventListener('resize', handleResize);
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};
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// eslint-disable-next-line react-hooks/exhaustive-deps
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}, [glitchSpeed, smooth]);
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const containerStyle = {
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position: 'relative',
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width: '100%',
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height: '100%',
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backgroundColor: '#000000',
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overflow: 'hidden'
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};
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const canvasStyle = {
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display: 'block',
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width: '100%',
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height: '100%'
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};
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const outerVignetteStyle = {
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position: 'absolute',
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top: 0,
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left: 0,
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width: '100%',
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height: '100%',
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pointerEvents: 'none',
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background: 'radial-gradient(circle, rgba(0,0,0,0) 60%, rgba(0,0,0,1) 100%)'
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};
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const centerVignetteStyle = {
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position: 'absolute',
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top: 0,
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left: 0,
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width: '100%',
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height: '100%',
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pointerEvents: 'none',
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background: 'radial-gradient(circle, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0) 60%)'
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};
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return (
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<div style={containerStyle} className={className}>
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<canvas ref={canvasRef} style={canvasStyle} />
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{outerVignette && <div style={outerVignetteStyle}></div>}
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{centerVignette && <div style={centerVignetteStyle}></div>}
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</div>
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);
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};
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export default LetterGlitch;
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