77 lines
2.3 KiB
JavaScript
77 lines
2.3 KiB
JavaScript
// ——————————————————————————————————————————————————
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// TextScramble
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// ——————————————————————————————————————————————————
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class TextScramble {
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constructor(el) {
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this.el = el;
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this.chars = '!<>-_\\/[]{}—=+*^?#________';
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this.update = this.update.bind(this);
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}
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setText(newText) {
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const oldText = this.el.innerText;
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const length = Math.max(oldText.length, newText.length);
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const promise = new Promise((resolve) => (this.resolve = resolve));
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this.queue = [];
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for (let i = 0; i < length; i++) {
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const from = oldText[i] || '';
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const to = newText[i] || '';
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const start = Math.floor(Math.random() * 40);
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const end = start + Math.floor(Math.random() * 40);
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this.queue.push({ from, to, start, end });
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}
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cancelAnimationFrame(this.frameRequest);
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this.frame = 0;
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this.update();
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return promise;
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}
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update() {
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let output = '';
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let complete = 0;
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for (let i = 0, n = this.queue.length; i < n; i++) {
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let { from, to, start, end, char } = this.queue[i];
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if (this.frame >= end) {
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complete++;
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output += to;
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} else if (this.frame >= start) {
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if (!char || Math.random() < 0.28) {
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char = this.randomChar();
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this.queue[i].char = char;
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}
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output += `<span class="dud">${char}</span>`;
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} else {
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output += from;
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}
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}
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this.el.innerHTML = output;
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if (complete === this.queue.length) {
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this.resolve();
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} else {
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this.frameRequest = requestAnimationFrame(this.update);
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this.frame++;
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}
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}
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randomChar() {
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return this.chars[Math.floor(Math.random() * this.chars.length)];
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}
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}
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// ——————————————————————————————————————————————————
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// Example
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// ——————————————————————————————————————————————————
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const phrases = [ 'Portfolio', 'Discord', 'Twitter', 'Websites' ];
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const el = document.querySelector('.text');
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const fx = new TextScramble(el);
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let counter = 0;
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const next = () => {
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fx.setText(phrases[counter]).then(() => {
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setTimeout(next, 1000 * 1);
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});
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counter = (counter + 1) % phrases.length;
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};
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next();
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