|
| 1 | +import React, { useState, useEffect } from "react" |
| 2 | + |
| 3 | +const Morpher = () => { |
| 4 | + const [state, setState] = useState({ |
| 5 | + text: "Ethereum", |
| 6 | + words: [ |
| 7 | + "Ethereum", |
| 8 | + "以太坊", |
| 9 | + "イーサリアム", |
| 10 | + "Etérium", |
| 11 | + "이더리움", |
| 12 | + "اتریوم", |
| 13 | + "Αιθέριο", |
| 14 | + "Eterijum", |
| 15 | + "إثيريوم", |
| 16 | + "อีเธอเรียม", |
| 17 | + "Эфириум", |
| 18 | + "इथीरियम", |
| 19 | + "ಇಥೀರಿಯಮ್", |
| 20 | + "אתריום", |
| 21 | + "Ξ", |
| 22 | + "ইথেরিয়াম", |
| 23 | + "எதீரியம்", |
| 24 | + "ఇథిరియూమ్", |
| 25 | + ], |
| 26 | + counter: 0, |
| 27 | + }) |
| 28 | + |
| 29 | + // loops over chars to morph a text to another |
| 30 | + const morpher = (start, end) => { |
| 31 | + // array of chars to randomly morph the text between start and end |
| 32 | + const chars = [ |
| 33 | + "a", |
| 34 | + "b", |
| 35 | + "c", |
| 36 | + "d", |
| 37 | + "x", |
| 38 | + "y", |
| 39 | + "z", |
| 40 | + "0", |
| 41 | + "1", |
| 42 | + "2", |
| 43 | + "3", |
| 44 | + "4", |
| 45 | + "5", |
| 46 | + "6", |
| 47 | + "7", |
| 48 | + "{", |
| 49 | + "}", |
| 50 | + "%", |
| 51 | + "$", |
| 52 | + "?", |
| 53 | + "!", |
| 54 | + ] |
| 55 | + // duration of the global morph |
| 56 | + const duration = 3 |
| 57 | + // speed of the morph for each letter |
| 58 | + const frameRate = 30 |
| 59 | + |
| 60 | + // text variables |
| 61 | + const string = start.split("") |
| 62 | + const result = end.split("") |
| 63 | + const slen = string.length |
| 64 | + const rlen = result.length |
| 65 | + |
| 66 | + // time variables |
| 67 | + let present = new Date() |
| 68 | + let past = present.getTime() |
| 69 | + let count = 0 |
| 70 | + let spentTime = 0 |
| 71 | + // splitTime = milliseconds / letters |
| 72 | + let splitTime = (duration * 70) / Math.max(slen, rlen) |
| 73 | + |
| 74 | + function update() { |
| 75 | + // Update present date and spent time |
| 76 | + present = new Date() |
| 77 | + spentTime += present.getTime() - past |
| 78 | + |
| 79 | + // Random letters |
| 80 | + for (let i = count; i < Math.max(slen, rlen); i++) { |
| 81 | + const random = Math.floor(Math.random() * (chars.length - 1)) |
| 82 | + // Change letter |
| 83 | + string[i] = chars[random] |
| 84 | + } |
| 85 | + |
| 86 | + // Morph letters from start to end |
| 87 | + if (spentTime >= splitTime) { |
| 88 | + // Update count of letters to morph |
| 89 | + count += Math.floor(spentTime / splitTime) |
| 90 | + // Morphing |
| 91 | + for (let j = 0; j < count; j++) { |
| 92 | + string[j] = result[j] || null |
| 93 | + } |
| 94 | + // Reset spent time |
| 95 | + spentTime = 0 |
| 96 | + } |
| 97 | + |
| 98 | + // Update DOM |
| 99 | + setState({ ...state, text: string.join("") }) |
| 100 | + |
| 101 | + // Save present date |
| 102 | + past = present.getTime() |
| 103 | + |
| 104 | + // Loop |
| 105 | + if (count < Math.max(slen, rlen)) { |
| 106 | + // Only use a setTimeout if the frameRate is lower than 60FPS |
| 107 | + // Remove the setTimeout if the frameRate is equal to 60FPS |
| 108 | + setTimeout(() => { |
| 109 | + window.requestAnimationFrame(update) |
| 110 | + }, 1000 / frameRate) |
| 111 | + } |
| 112 | + } |
| 113 | + |
| 114 | + // Start loop |
| 115 | + update() |
| 116 | + } |
| 117 | + |
| 118 | + useEffect(() => { |
| 119 | + const morphInterval = setInterval(() => { |
| 120 | + const start = state.text |
| 121 | + const end = state.words[state.counter] |
| 122 | + |
| 123 | + morpher(start, end) |
| 124 | + |
| 125 | + if (state.counter < state.words.length - 1) { |
| 126 | + setState({ ...state, counter: state.counter++ }) |
| 127 | + } else { |
| 128 | + // TODO this doesn't work, it doesn't set counter state |
| 129 | + setState({ ...state, counter: 0 }) |
| 130 | + } |
| 131 | + }, 3000) |
| 132 | + |
| 133 | + return () => { |
| 134 | + clearInterval(morphInterval) |
| 135 | + } |
| 136 | + }) |
| 137 | + |
| 138 | + return <span>{state.text}</span> |
| 139 | +} |
| 140 | + |
| 141 | +export default Morpher |
0 commit comments