08文字が点に散って再び集まるタイポグラフィのディザ
文字をオフスクリーンキャンバスに描いて明るさのマスクとして読み、時間で動く閾値で点単位に消して戻す。
使いどころタイトルやロゴの登場演出
DISSOLVE_SPEEDFONT_PXMASK_BLURBAYER_SIZE
<main class="stage">
<div class="sc is-demo" id="scRoot">
<canvas class="sc__canvas" id="scCanvas" width="480" height="300" tabindex="0" aria-label="文字が点に散って再び集まるタイポグラフィのディザ"></canvas>
<p class="sc__status" id="scStatus" aria-live="polite">文字がくっきり — まもなく点に散る</p>
<button class="sc__btn" id="scBtn" type="button">一時停止</button>
<p class="sc__caption">文字が点に散って再び集まるタイポグラフィのディザ</p>
</div>
</main>@use "../../../../site/static/demo-tokens" as *;
@include stage($stage-ink);
.sc {
position: relative;
width: min(92vw, calc(160vh - 12.8vw));
aspect-ratio: 480 / 300;
margin: 0 auto;
border-radius: $r-card;
overflow: hidden;
box-shadow: $shadow-raised;
background: $subject-ink;
}
.sc__canvas {
display: block;
width: 100%;
height: 100%;
touch-action: none;
image-rendering: pixelated;
}
.sc__canvas:focus-visible {
outline: 2px solid rgba(255, 255, 255, .85);
outline-offset: -6px;
}
.sc__status {
position: absolute;
left: $sp-3;
top: $sp-3;
max-width: 62%;
margin: 0;
padding: $sp-1 $sp-3;
border-radius: $r-pill;
background: rgba(255, 255, 255, .85);
color: $subject-ink;
font-weight: 500;
font-size: 11px;
line-height: 1.4;
pointer-events: none;
}
.sc__btn {
position: absolute;
right: $sp-3;
bottom: $sp-3;
margin: 0;
padding: $sp-1 $sp-3;
border: 0;
border-radius: $r-pill;
background: rgba(255, 255, 255, .85);
color: $subject-ink;
font: inherit;
font-weight: 500;
font-size: 12px;
line-height: 1.4;
cursor: pointer;
}
.sc__btn:focus-visible {
outline: 2px solid #ffffff;
outline-offset: 2px;
}
.sc__caption {
position: absolute;
left: $sp-3;
bottom: $sp-3;
max-width: 68%;
margin: 0;
padding: $sp-1 $sp-3;
border-radius: $r-pill;
background: rgba(255, 255, 255, .85);
color: $subject-ink;
font-weight: 500;
font-size: 12px;
line-height: 1.4;
pointer-events: none;
}
@media (max-width: 340px) {
.sc__caption, .sc__btn { font-size: 10px; padding: $sp-1 $sp-2; }
.sc__status { font-size: 10px; }
}
@media (prefers-reduced-motion: reduce) {
.sc { cursor: default; }
}html, body {
margin: 0;
overflow: hidden;
}
.stage {
box-sizing: border-box;
min-height: 100vh;
display: grid;
place-items: center;
margin: 0;
background: #17141a;
font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
padding: clamp(8px, 4vw, 24px);
}
.sc {
position: relative;
width: min(92vw, 160vh - 12.8vw);
aspect-ratio: 480/300;
margin: 0 auto;
border-radius: 16px;
overflow: hidden;
box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
background: #17141a;
}
.sc__canvas {
display: block;
width: 100%;
height: 100%;
touch-action: none;
image-rendering: pixelated;
}
.sc__canvas:focus-visible {
outline: 2px solid rgba(255, 255, 255, 0.85);
outline-offset: -6px;
}
.sc__status {
position: absolute;
left: 12px;
top: 12px;
max-width: 62%;
margin: 0;
padding: 4px 12px;
border-radius: 999px;
background: rgba(255, 255, 255, 0.85);
color: #17141a;
font-weight: 500;
font-size: 11px;
line-height: 1.4;
pointer-events: none;
}
.sc__btn {
position: absolute;
right: 12px;
bottom: 12px;
margin: 0;
padding: 4px 12px;
border: 0;
border-radius: 999px;
background: rgba(255, 255, 255, 0.85);
color: #17141a;
font: inherit;
font-weight: 500;
font-size: 12px;
line-height: 1.4;
cursor: pointer;
}
.sc__btn:focus-visible {
outline: 2px solid #ffffff;
outline-offset: 2px;
}
.sc__caption {
position: absolute;
left: 12px;
bottom: 12px;
max-width: 68%;
margin: 0;
padding: 4px 12px;
border-radius: 999px;
background: rgba(255, 255, 255, 0.85);
color: #17141a;
font-weight: 500;
font-size: 12px;
line-height: 1.4;
pointer-events: none;
}
@media (max-width: 340px) {
.sc__caption, .sc__btn {
font-size: 10px;
padding: 4px 8px;
}
.sc__status {
font-size: 10px;
}
}
@media (prefers-reduced-motion: reduce) {
.sc {
cursor: default;
}
}(function () {
const W = 480;
const H = 300;
const PI2 = Math.PI * 2;
const FIXED_DT = 16;
const REDUCE_STEP_MS = 900;
const KEY_STEP = 14;
const IDLE_TICKS = 150;
const BTN_PAUSE = '一時停止';
const BTN_PLAY = '再生';
const BTN_NEXT = '次の場面';
// 점을 찍는 작은 격자 — 화면에는 3배로 확대해 올린다
const GW = 160;
const GH = 100;
function clamp(v, lo, hi) { return v < lo ? lo : (v > hi ? hi : v); }
function lerp(a, b, k) { return a + (b - a) * k; }
function smooth(x) { const c = clamp(x, 0, 1); return c * c * (3 - 2 * c); }
function frac(x) { return x - Math.floor(x); }
// 시드 고정 난수 — 같은 시드면 언제나 같은 수열 (선형 합동 방식)
function lcg(seed) {
let s = seed >>> 0;
return function () {
s = (Math.imul(s, 1664525) + 1013904223) >>> 0;
return s / 4294967296;
};
}
// 좌표 두 개와 시드로 0 이상 1 미만의 값을 만드는 정수 해시 (난수 함수 없이도 같은 좌표는 늘 같은 값)
function hash2(x, y, seed) {
let h = (Math.imul(x | 0, 374761393) + Math.imul(y | 0, 668265263) + Math.imul(seed | 0, 1442695041)) | 0;
h = Math.imul(h ^ (h >>> 13), 1274126177);
h ^= h >>> 16;
return (h >>> 0) / 4294967296;
}
// 격자 네 점의 해시를 smooth 로 이어 붙인 값 노이즈
function vnoise(x, y, seed) {
const xi = Math.floor(x);
const yi = Math.floor(y);
const fx = smooth(x - xi);
const fy = smooth(y - yi);
const a = lerp(hash2(xi, yi, seed), hash2(xi + 1, yi, seed), fx);
const b = lerp(hash2(xi, yi + 1, seed), hash2(xi + 1, yi + 1, seed), fx);
return lerp(a, b, fy);
}
// 베이어 임계 행렬 — n 은 2 의 거듭제곱. 값은 0 초과 1 미만으로 맞춘다
function makeBayer(n) {
let size = 2;
let m = [0, 2, 3, 1];
const quad = [0, 2, 3, 1];
while (size < n) {
const s2 = size * 2;
const next = [];
for (let y = 0; y < s2; y += 1) {
for (let x = 0; x < s2; x += 1) {
const q = (y >= size ? 2 : 0) + (x >= size ? 1 : 0);
next.push(4 * m[(y % size) * size + (x % size)] + quad[q]);
}
}
m = next;
size = s2;
}
const out = new Float32Array(n * n);
for (let i = 0; i < out.length; i += 1) {
out[i] = (m[i] + 0.5) / (n * n);
}
return out;
}
// 색 하나를 캔버스 픽셀 한 개(리틀 엔디언 RGBA)로 묶는다
function pack(c) {
return ((255 << 24) | (Math.round(c[2]) << 16) | (Math.round(c[1]) << 8) | Math.round(c[0])) >>> 0;
}
function mixPack(a, b, k) {
return pack([lerp(a[0], b[0], k), lerp(a[1], b[1], k), lerp(a[2], b[2], k)]);
}
function makeBuf() {
const off = document.createElement('canvas');
off.width = GW;
off.height = GH;
const octx = off.getContext('2d');
if (!octx) {
throw new Error('2d context unavailable');
}
const img = octx.createImageData(GW, GH);
return { off: off, octx: octx, img: img, px: new Uint32Array(img.data.buffer) };
}
// 작은 격자를 큰 캔버스에 보간 없이 확대해 올린다
function flush(ctx, b) {
b.octx.putImageData(b.img, 0, 0);
ctx.imageSmoothingEnabled = false;
ctx.drawImage(b.off, 0, 0, W, H);
}
function start(root, canvas, statusEl, btnEl, make) {
const ctx0 = canvas.getContext('2d');
if (!ctx0) {
return function () { return; };
}
const ctx = ctx0;
const dpr = Math.min(window.devicePixelRatio || 1, 2);
canvas.width = Math.round(W * dpr);
canvas.height = Math.round(H * dpr);
ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
const reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
const inp = { x: W / 2, y: H / 2, idle: 99999 };
const scene = make(inp, reduce);
let paused = false;
let rafId = 0;
let lastTs = -1;
let accMs = 0;
let lastLabel = '';
const cleaners = [];
function listen(target, type, fn) {
target.addEventListener(type, fn);
cleaners.push(function () { target.removeEventListener(type, fn); });
}
function show() {
scene.draw(ctx);
const t = scene.label();
if (t !== lastLabel) {
lastLabel = t;
statusEl.textContent = t;
}
}
function advance(ms) {
const n = Math.round(ms / FIXED_DT);
for (let i = 0; i < n; i += 1) {
inp.idle += 1;
scene.step();
}
}
function refresh() {
if (reduce) {
advance(FIXED_DT * 6);
show();
}
}
function toLocal(e) {
const r = canvas.getBoundingClientRect();
inp.x = clamp((e.clientX - r.left) * W / r.width, 0, W);
inp.y = clamp((e.clientY - r.top) * H / r.height, 0, H);
inp.idle = 0;
}
function tick(ts) {
if (lastTs < 0) {
lastTs = ts;
}
const frameDt = Math.min(ts - lastTs, 160);
lastTs = ts;
if (!paused) {
accMs += frameDt;
while (accMs >= FIXED_DT) {
inp.idle += 1;
scene.step();
accMs -= FIXED_DT;
}
show();
}
rafId = requestAnimationFrame(tick);
}
btnEl.textContent = reduce ? BTN_NEXT : BTN_PAUSE;
if (reduce) {
root.classList.remove('is-demo');
advance(1400);
show();
}
listen(btnEl, 'click', function () {
if (reduce) {
advance(REDUCE_STEP_MS);
show();
return;
}
paused = !paused;
if (paused) {
root.classList.remove('is-demo');
}
else {
root.classList.add('is-demo');
}
btnEl.textContent = paused ? BTN_PLAY : BTN_PAUSE;
});
listen(canvas, 'pointermove', function (e) {
toLocal(e);
refresh();
});
listen(canvas, 'pointerdown', function (e) {
toLocal(e);
scene.tap();
refresh();
});
listen(canvas, 'keydown', function (e) {
const k = e.key;
let dx = 0;
let dy = 0;
if (k === 'Enter' || k === ' ') {
e.preventDefault();
scene.tap();
refresh();
return;
}
if (k === 'ArrowLeft') {
dx = -KEY_STEP;
}
else if (k === 'ArrowRight') {
dx = KEY_STEP;
}
else if (k === 'ArrowUp') {
dy = -KEY_STEP;
}
else if (k === 'ArrowDown') {
dy = KEY_STEP;
}
else {
return;
}
e.preventDefault();
inp.x = clamp(inp.x + dx, 0, W);
inp.y = clamp(inp.y + dy, 0, H);
inp.idle = 0;
refresh();
});
if (!reduce) {
rafId = requestAnimationFrame(tick);
}
return function () {
cancelAnimationFrame(rafId);
for (let i = 0; i < cleaners.length; i += 1) {
cleaners[i]();
}
};
}
const DISSOLVE_SPEED = 0.014;
const FONT_PX = 38;
const MASK_BLUR = 1;
const BAYER_SIZE = 8;
const SKEW = 0.7;
const THR_DRIFT = 0.021;
const WORD = 'DITHER';
const INK = [35, 30, 52];
const TEXT_LIGHT = [255, 236, 214];
const GHOST = [118, 98, 160];
const BG_DOT = [66, 55, 98];
const TXT_SOLID = '文字がくっきり — まもなく点に散る';
const TXT_SCATTER = '閾値が左から文字を消していく';
const TXT_EMPTY = '文字がすべて点になって散った';
const TXT_GATHER = '点が再び集まって文字になる';
const TXT_SCRUB = 'ポインターの横位置が消えた度合いになる';
function makeScene(inp, reduce) {
const buf = makeBuf();
const matrix = makeBayer(BAYER_SIZE);
const ink = pack(INK);
const textLight = pack(TEXT_LIGHT);
const ghost = pack(GHOST);
const bgDot = pack(BG_DOT);
// 글자를 보이지 않는 캔버스에 그려 밝기 마스크로 읽는다
const mask = new Float32Array(GW * GH);
const off = document.createElement('canvas');
off.width = GW;
off.height = GH;
const octx = off.getContext('2d');
if (octx) {
octx.fillStyle = '#000000';
octx.fillRect(0, 0, GW, GH);
octx.fillStyle = '#ffffff';
octx.font = 'bold ' + FONT_PX + 'px sans-serif';
octx.textAlign = 'center';
octx.textBaseline = 'middle';
octx.fillText(WORD, GW / 2, GH / 2);
const data = octx.getImageData(0, 0, GW, GH).data;
const raw = new Float32Array(GW * GH);
for (let i = 0; i < raw.length; i += 1) {
raw[i] = data[i * 4] / 255;
}
// 상자 흐림 — 가장자리를 0 과 1 사이 값으로 풀어 점이 바깥까지 번지게 한다
for (let y = 0; y < GH; y += 1) {
for (let x = 0; x < GW; x += 1) {
let sum = 0;
let n = 0;
for (let dy = -MASK_BLUR; dy <= MASK_BLUR; dy += 1) {
for (let dx = -MASK_BLUR; dx <= MASK_BLUR; dx += 1) {
const xx = x + dx;
const yy = y + dy;
if (xx >= 0 && xx < GW && yy >= 0 && yy < GH) {
sum += raw[yy * GW + xx];
n += 1;
}
}
}
mask[y * GW + x] = sum / n;
}
}
}
let t = 0;
let prog = 0;
function triangle(tick) {
const w = (tick * DISSOLVE_SPEED) % 2;
return w < 1 ? w : 2 - w;
}
const scene = {
step() {
t += 1;
const target = inp.idle < IDLE_TICKS ? clamp(inp.x / W, 0, 1) : triangle(t);
prog = lerp(prog, target, 0.2);
},
draw(ctx) {
// 양 끝에서 잠깐 멈추도록 진행도를 다듬는다
const p = clamp((prog - 0.12) / 0.76, 0, 1);
for (let y = 0; y < GH; y += 1) {
for (let x = 0; x < GW; x += 1) {
const i = y * GW + x;
const xn = x / GW;
const vis = clamp(1 - (p * (1 + SKEW) - xn * SKEW), 0, 1);
const thr = frac(matrix[(y % BAYER_SIZE) * BAYER_SIZE + (x % BAYER_SIZE)] + t * THR_DRIFT);
const m = mask[i];
if (m * vis > thr) {
buf.px[i] = textLight;
}
else if (m > 0.5 && ((x + y) & 1) === 0) {
buf.px[i] = ghost;
}
else {
const v = 0.14 + 0.12 * (0.5 + 0.5 * Math.sin(x * 0.09 + y * 0.06 - t * 0.05));
buf.px[i] = v > matrix[(y % BAYER_SIZE) * BAYER_SIZE + (x % BAYER_SIZE)] ? bgDot : ink;
}
}
}
flush(ctx, buf);
},
label() {
if (inp.idle < IDLE_TICKS) {
return TXT_SCRUB;
}
const w = (t * DISSOLVE_SPEED) % 2;
if (prog < 0.12) {
return TXT_SOLID;
}
if (prog > 0.88) {
return TXT_EMPTY;
}
return w < 1 ? TXT_SCATTER : TXT_GATHER;
},
tap() {
t = 0;
prog = 0;
inp.idle = IDLE_TICKS;
}
};
if (reduce) {
t = Math.floor(0.45 / DISSOLVE_SPEED);
prog = 0.45;
}
return scene;
}
start(document.getElementById('scRoot'), document.getElementById('scCanvas'), document.getElementById('scStatus'), document.getElementById('scBtn'), makeScene);
})();import { useEffect, useRef } from "react";
import styles from "./DtTextDitherDissolve.module.scss";
const W = 480;
const H = 300;
const PI2 = Math.PI * 2;
const FIXED_DT = 16;
const REDUCE_STEP_MS = 900;
const KEY_STEP = 14;
const IDLE_TICKS = 150;
const BTN_PAUSE = '멈춤';
const BTN_PLAY = '재생';
const BTN_NEXT = '다음 장면';
// 점을 찍는 작은 격자 — 화면에는 3배로 확대해 올린다
const GW = 160;
const GH = 100;
type RGB = [number, number, number];
interface Input { x: number; y: number; idle: number; }
interface Scene {
step(): void;
draw(ctx: CanvasRenderingContext2D): void;
label(): string;
tap(): void;
}
type Maker = (inp: Input, reduce: boolean) => Scene;
interface Buf {
off: HTMLCanvasElement;
octx: CanvasRenderingContext2D;
img: ImageData;
px: Uint32Array;
}
function clamp(v: number, lo: number, hi: number): number { return v < lo ? lo : (v > hi ? hi : v); }
function lerp(a: number, b: number, k: number): number { return a + (b - a) * k; }
function smooth(x: number): number { const c = clamp(x, 0, 1); return c * c * (3 - 2 * c); }
function frac(x: number): number { return x - Math.floor(x); }
// 시드 고정 난수 — 같은 시드면 언제나 같은 수열 (선형 합동 방식)
function lcg(seed: number): () => number {
let s = seed >>> 0;
return function (): number {
s = (Math.imul(s, 1664525) + 1013904223) >>> 0;
return s / 4294967296;
};
}
// 좌표 두 개와 시드로 0 이상 1 미만의 값을 만드는 정수 해시 (난수 함수 없이도 같은 좌표는 늘 같은 값)
function hash2(x: number, y: number, seed: number): number {
let h = (Math.imul(x | 0, 374761393) + Math.imul(y | 0, 668265263) + Math.imul(seed | 0, 1442695041)) | 0;
h = Math.imul(h ^ (h >>> 13), 1274126177);
h ^= h >>> 16;
return (h >>> 0) / 4294967296;
}
// 격자 네 점의 해시를 smooth 로 이어 붙인 값 노이즈
function vnoise(x: number, y: number, seed: number): number {
const xi = Math.floor(x);
const yi = Math.floor(y);
const fx = smooth(x - xi);
const fy = smooth(y - yi);
const a = lerp(hash2(xi, yi, seed), hash2(xi + 1, yi, seed), fx);
const b = lerp(hash2(xi, yi + 1, seed), hash2(xi + 1, yi + 1, seed), fx);
return lerp(a, b, fy);
}
// 베이어 임계 행렬 — n 은 2 의 거듭제곱. 값은 0 초과 1 미만으로 맞춘다
function makeBayer(n: number): Float32Array {
let size = 2;
let m: number[] = [0, 2, 3, 1];
const quad = [0, 2, 3, 1];
while (size < n) {
const s2 = size * 2;
const next: number[] = [];
for (let y = 0; y < s2; y += 1) {
for (let x = 0; x < s2; x += 1) {
const q = (y >= size ? 2 : 0) + (x >= size ? 1 : 0);
next.push(4 * m[(y % size) * size + (x % size)] + quad[q]);
}
}
m = next;
size = s2;
}
const out = new Float32Array(n * n);
for (let i = 0; i < out.length; i += 1) {
out[i] = (m[i] + 0.5) / (n * n);
}
return out;
}
// 색 하나를 캔버스 픽셀 한 개(리틀 엔디언 RGBA)로 묶는다
function pack(c: RGB): number {
return ((255 << 24) | (Math.round(c[2]) << 16) | (Math.round(c[1]) << 8) | Math.round(c[0])) >>> 0;
}
function mixPack(a: RGB, b: RGB, k: number): number {
return pack([lerp(a[0], b[0], k), lerp(a[1], b[1], k), lerp(a[2], b[2], k)]);
}
function makeBuf(): Buf {
const off = document.createElement('canvas');
off.width = GW;
off.height = GH;
const octx = off.getContext('2d');
if (!octx) {
throw new Error('2d context unavailable');
}
const img = octx.createImageData(GW, GH);
return { off: off, octx: octx, img: img, px: new Uint32Array(img.data.buffer) };
}
// 작은 격자를 큰 캔버스에 보간 없이 확대해 올린다
function flush(ctx: CanvasRenderingContext2D, b: Buf): void {
b.octx.putImageData(b.img, 0, 0);
ctx.imageSmoothingEnabled = false;
ctx.drawImage(b.off, 0, 0, W, H);
}
function start(root: HTMLElement, canvas: HTMLCanvasElement, statusEl: HTMLElement, btnEl: HTMLButtonElement, make: Maker): () => void {
const ctx0 = canvas.getContext('2d');
if (!ctx0) {
return function (): void { return; };
}
const ctx: CanvasRenderingContext2D = ctx0;
const dpr = Math.min(window.devicePixelRatio || 1, 2);
canvas.width = Math.round(W * dpr);
canvas.height = Math.round(H * dpr);
ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
const reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
const inp: Input = { x: W / 2, y: H / 2, idle: 99999 };
const scene = make(inp, reduce);
let paused = false;
let rafId = 0;
let lastTs = -1;
let accMs = 0;
let lastLabel = '';
const cleaners: Array<() => void> = [];
function listen(target: EventTarget, type: string, fn: (e: Event) => void): void {
target.addEventListener(type, fn);
cleaners.push(function (): void { target.removeEventListener(type, fn); });
}
function show(): void {
scene.draw(ctx);
const t = scene.label();
if (t !== lastLabel) {
lastLabel = t;
statusEl.textContent = t;
}
}
function advance(ms: number): void {
const n = Math.round(ms / FIXED_DT);
for (let i = 0; i < n; i += 1) {
inp.idle += 1;
scene.step();
}
}
function refresh(): void {
if (reduce) {
advance(FIXED_DT * 6);
show();
}
}
function toLocal(e: PointerEvent): void {
const r = canvas.getBoundingClientRect();
inp.x = clamp((e.clientX - r.left) * W / r.width, 0, W);
inp.y = clamp((e.clientY - r.top) * H / r.height, 0, H);
inp.idle = 0;
}
function tick(ts: number): void {
if (lastTs < 0) {
lastTs = ts;
}
const frameDt = Math.min(ts - lastTs, 160);
lastTs = ts;
if (!paused) {
accMs += frameDt;
while (accMs >= FIXED_DT) {
inp.idle += 1;
scene.step();
accMs -= FIXED_DT;
}
show();
}
rafId = requestAnimationFrame(tick);
}
btnEl.textContent = reduce ? BTN_NEXT : BTN_PAUSE;
if (reduce) {
root.classList.remove('is-demo');
advance(1400);
show();
}
listen(btnEl, 'click', function (): void {
if (reduce) {
advance(REDUCE_STEP_MS);
show();
return;
}
paused = !paused;
if (paused) {
root.classList.remove('is-demo');
} else {
root.classList.add('is-demo');
}
btnEl.textContent = paused ? BTN_PLAY : BTN_PAUSE;
});
listen(canvas, 'pointermove', function (e: Event): void {
toLocal(e as PointerEvent);
refresh();
});
listen(canvas, 'pointerdown', function (e: Event): void {
toLocal(e as PointerEvent);
scene.tap();
refresh();
});
listen(canvas, 'keydown', function (e: Event): void {
const k = (e as KeyboardEvent).key;
let dx = 0;
let dy = 0;
if (k === 'Enter' || k === ' ') {
e.preventDefault();
scene.tap();
refresh();
return;
}
if (k === 'ArrowLeft') { dx = -KEY_STEP; }
else if (k === 'ArrowRight') { dx = KEY_STEP; }
else if (k === 'ArrowUp') { dy = -KEY_STEP; }
else if (k === 'ArrowDown') { dy = KEY_STEP; }
else { return; }
e.preventDefault();
inp.x = clamp(inp.x + dx, 0, W);
inp.y = clamp(inp.y + dy, 0, H);
inp.idle = 0;
refresh();
});
if (!reduce) {
rafId = requestAnimationFrame(tick);
}
return function (): void {
cancelAnimationFrame(rafId);
for (let i = 0; i < cleaners.length; i += 1) {
cleaners[i]();
}
};
}
const DISSOLVE_SPEED = 0.014;
const FONT_PX = 38;
const MASK_BLUR = 1;
const BAYER_SIZE = 8;
const SKEW = 0.7;
const THR_DRIFT = 0.021;
const WORD = 'DITHER';
const INK: RGB = [35, 30, 52];
const TEXT_LIGHT: RGB = [255, 236, 214];
const GHOST: RGB = [118, 98, 160];
const BG_DOT: RGB = [66, 55, 98];
const TXT_SOLID = '글자가 또렷하다 — 곧 점으로 흩어진다';
const TXT_SCATTER = '임계값이 왼쪽부터 글자를 지운다';
const TXT_EMPTY = '글자가 모두 점이 되어 흩어졌다';
const TXT_GATHER = '점이 다시 모여 글자가 된다';
const TXT_SCRUB = '포인터 가로 위치가 지워진 정도다';
function makeScene(inp: Input, reduce: boolean): Scene {
const buf = makeBuf();
const matrix = makeBayer(BAYER_SIZE);
const ink = pack(INK);
const textLight = pack(TEXT_LIGHT);
const ghost = pack(GHOST);
const bgDot = pack(BG_DOT);
// 글자를 보이지 않는 캔버스에 그려 밝기 마스크로 읽는다
const mask = new Float32Array(GW * GH);
const off = document.createElement('canvas');
off.width = GW;
off.height = GH;
const octx = off.getContext('2d');
if (octx) {
octx.fillStyle = '#000000';
octx.fillRect(0, 0, GW, GH);
octx.fillStyle = '#ffffff';
octx.font = 'bold ' + FONT_PX + 'px sans-serif';
octx.textAlign = 'center';
octx.textBaseline = 'middle';
octx.fillText(WORD, GW / 2, GH / 2);
const data = octx.getImageData(0, 0, GW, GH).data;
const raw = new Float32Array(GW * GH);
for (let i = 0; i < raw.length; i += 1) {
raw[i] = data[i * 4] / 255;
}
// 상자 흐림 — 가장자리를 0 과 1 사이 값으로 풀어 점이 바깥까지 번지게 한다
for (let y = 0; y < GH; y += 1) {
for (let x = 0; x < GW; x += 1) {
let sum = 0;
let n = 0;
for (let dy = -MASK_BLUR; dy <= MASK_BLUR; dy += 1) {
for (let dx = -MASK_BLUR; dx <= MASK_BLUR; dx += 1) {
const xx = x + dx;
const yy = y + dy;
if (xx >= 0 && xx < GW && yy >= 0 && yy < GH) {
sum += raw[yy * GW + xx];
n += 1;
}
}
}
mask[y * GW + x] = sum / n;
}
}
}
let t = 0;
let prog = 0;
function triangle(tick: number): number {
const w = (tick * DISSOLVE_SPEED) % 2;
return w < 1 ? w : 2 - w;
}
const scene: Scene = {
step(): void {
t += 1;
const target = inp.idle < IDLE_TICKS ? clamp(inp.x / W, 0, 1) : triangle(t);
prog = lerp(prog, target, 0.2);
},
draw(ctx: CanvasRenderingContext2D): void {
// 양 끝에서 잠깐 멈추도록 진행도를 다듬는다
const p = clamp((prog - 0.12) / 0.76, 0, 1);
for (let y = 0; y < GH; y += 1) {
for (let x = 0; x < GW; x += 1) {
const i = y * GW + x;
const xn = x / GW;
const vis = clamp(1 - (p * (1 + SKEW) - xn * SKEW), 0, 1);
const thr = frac(matrix[(y % BAYER_SIZE) * BAYER_SIZE + (x % BAYER_SIZE)] + t * THR_DRIFT);
const m = mask[i];
if (m * vis > thr) {
buf.px[i] = textLight;
} else if (m > 0.5 && ((x + y) & 1) === 0) {
buf.px[i] = ghost;
} else {
const v = 0.14 + 0.12 * (0.5 + 0.5 * Math.sin(x * 0.09 + y * 0.06 - t * 0.05));
buf.px[i] = v > matrix[(y % BAYER_SIZE) * BAYER_SIZE + (x % BAYER_SIZE)] ? bgDot : ink;
}
}
}
flush(ctx, buf);
},
label(): string {
if (inp.idle < IDLE_TICKS) {
return TXT_SCRUB;
}
const w = (t * DISSOLVE_SPEED) % 2;
if (prog < 0.12) {
return TXT_SOLID;
}
if (prog > 0.88) {
return TXT_EMPTY;
}
return w < 1 ? TXT_SCATTER : TXT_GATHER;
},
tap(): void {
t = 0;
prog = 0;
inp.idle = IDLE_TICKS;
}
};
if (reduce) {
t = Math.floor(0.45 / DISSOLVE_SPEED);
prog = 0.45;
}
return scene;
}
export default function DtTextDitherDissolve() {
const rootRef = useRef<HTMLDivElement | null>(null);
const canvasRef = useRef<HTMLCanvasElement | null>(null);
const statusRef = useRef<HTMLParagraphElement | null>(null);
const btnRef = useRef<HTMLButtonElement | null>(null);
useEffect(() => {
const root = rootRef.current;
const canvas = canvasRef.current;
const statusEl = statusRef.current;
const btnEl = btnRef.current;
if (!root || !canvas || !statusEl || !btnEl) return;
return start(root, canvas, statusEl, btnEl, makeScene);
}, []);
return (
<main className={styles.stage}>
<div className={`${styles.sc} is-demo`} ref={rootRef}>
<canvas className={styles.sc__canvas} ref={canvasRef} width={480} height={300} tabIndex={0} aria-label="글자가 점으로 흩어졌다 다시 모이는 타이포 디더" />
<p className={styles.sc__status} ref={statusRef} aria-live="polite">글자가 또렷하다 — 곧 점으로 흩어진다</p>
<button className={styles.sc__btn} ref={btnRef} type="button">멈춤</button>
<p className={styles.sc__caption}>글자가 점으로 흩어졌다 다시 모이는 타이포 디더</p>
</div>
</main>
);
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