04An Interleaved-Noise Transition That Dissolves One Scene into the Next as Dots
A pseudo-random threshold made from each pixel's coordinates is compared with progress to pick one of two scenes, so the switch spreads evenly as dots.
Best forPage transitions and slide changes
NOISE_ANOISE_BFADE_PERIODHOLD_FRAMES
<main class="stage">
<div class="sc is-demo" id="scRoot">
<canvas class="sc__canvas" id="scCanvas" width="480" height="300" tabindex="0" aria-label="An Interleaved-Noise Transition That Dissolves One Scene into the Next as Dots"></canvas>
<p class="sc__status" id="scStatus" aria-live="polite">Ring scene — about to melt into dots</p>
<button class="sc__btn" id="scBtn" type="button">Pause</button>
<p class="sc__caption">An Interleaved-Noise Transition That Dissolves One Scene into the Next as Dots</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 = 'Pause';
const BTN_PLAY = 'Play';
const BTN_NEXT = 'Next scene';
// 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 NOISE_A = 0.06711056;
const NOISE_B = 0.00583715;
const FADE_PERIOD = 60;
const HOLD_FRAMES = 14;
const RING_FREQ = 0.28;
const STRIPE_FREQ = 0.22;
const RING_DARK = [54, 41, 80];
const RING_LIGHT = [255, 196, 214];
const STRIPE_DARK = [28, 52, 74];
const STRIPE_LIGHT = [186, 238, 225];
const TXT_RINGS = 'Ring scene — about to melt into dots';
const TXT_MIX = 'Mixing dot by dot — the threshold follows progress';
const TXT_STRIPES = 'Stripe scene — melting back again';
function makeScene(inp, reduce) {
const buf = makeBuf();
const cycle = 2 * (FADE_PERIOD + HOLD_FRAMES);
const ringLo = RING_DARK;
const ringHi = RING_LIGHT;
let t = 0;
let p = 0;
// 진행도 p — 0 이면 첫 장면, 1 이면 두 번째 장면
function progressAt(tick) {
const c = tick % cycle;
if (c < HOLD_FRAMES) {
return 0;
}
if (c < HOLD_FRAMES + FADE_PERIOD) {
return (c - HOLD_FRAMES) / FADE_PERIOD;
}
if (c < 2 * HOLD_FRAMES + FADE_PERIOD) {
return 1;
}
return 1 - (c - 2 * HOLD_FRAMES - FADE_PERIOD) / FADE_PERIOD;
}
const scene = {
step() {
t += 1;
const target = inp.idle < IDLE_TICKS ? clamp(inp.x / W, 0, 1) : progressAt(t);
p = lerp(p, target, 0.2);
},
draw(ctx) {
for (let y = 0; y < GH; y += 1) {
for (let x = 0; x < GW; x += 1) {
// 인터리브 그라디언트 노이즈 — 좌표만으로 정해지는 0~1 값
const thr = frac(52.9829189 * frac(NOISE_A * x + NOISE_B * y));
if (thr < p) {
const s = Math.sin((x * 0.7 + y * 0.7) * STRIPE_FREQ + t * 0.1);
buf.px[y * GW + x] = mixPack(STRIPE_DARK, STRIPE_LIGHT, smooth(s * 1.5 + 0.5));
}
else {
const s = Math.sin(Math.hypot(x - GW * 0.35, y - GH * 0.55) * RING_FREQ - t * 0.12);
buf.px[y * GW + x] = mixPack(ringLo, ringHi, smooth(s * 1.5 + 0.5));
}
}
}
flush(ctx, buf);
},
label() {
if (p < 0.02) {
return TXT_RINGS;
}
return p > 0.98 ? TXT_STRIPES : TXT_MIX;
},
tap() {
const c = t % cycle;
t = c < cycle / 2 ? HOLD_FRAMES : 2 * HOLD_FRAMES + FADE_PERIOD;
inp.idle = IDLE_TICKS;
}
};
if (reduce) {
t = HOLD_FRAMES + Math.floor(FADE_PERIOD * 0.5);
scene.step();
}
return scene;
}
start(document.getElementById('scRoot'), document.getElementById('scCanvas'), document.getElementById('scStatus'), document.getElementById('scBtn'), makeScene);
})();import { useEffect, useRef } from "react";
import styles from "./DtGradientNoiseDissolve.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 NOISE_A = 0.06711056;
const NOISE_B = 0.00583715;
const FADE_PERIOD = 60;
const HOLD_FRAMES = 14;
const RING_FREQ = 0.28;
const STRIPE_FREQ = 0.22;
const RING_DARK: RGB = [54, 41, 80];
const RING_LIGHT: RGB = [255, 196, 214];
const STRIPE_DARK: RGB = [28, 52, 74];
const STRIPE_LIGHT: RGB = [186, 238, 225];
const TXT_RINGS = '고리 장면 — 곧 점으로 녹는다';
const TXT_MIX = '점 단위로 섞이는 중 — 임계값이 진행도를 따라간다';
const TXT_STRIPES = '줄무늬 장면 — 다시 녹아 돌아간다';
function makeScene(inp: Input, reduce: boolean): Scene {
const buf = makeBuf();
const cycle = 2 * (FADE_PERIOD + HOLD_FRAMES);
const ringLo = RING_DARK;
const ringHi = RING_LIGHT;
let t = 0;
let p = 0;
// 진행도 p — 0 이면 첫 장면, 1 이면 두 번째 장면
function progressAt(tick: number): number {
const c = tick % cycle;
if (c < HOLD_FRAMES) {
return 0;
}
if (c < HOLD_FRAMES + FADE_PERIOD) {
return (c - HOLD_FRAMES) / FADE_PERIOD;
}
if (c < 2 * HOLD_FRAMES + FADE_PERIOD) {
return 1;
}
return 1 - (c - 2 * HOLD_FRAMES - FADE_PERIOD) / FADE_PERIOD;
}
const scene: Scene = {
step(): void {
t += 1;
const target = inp.idle < IDLE_TICKS ? clamp(inp.x / W, 0, 1) : progressAt(t);
p = lerp(p, target, 0.2);
},
draw(ctx: CanvasRenderingContext2D): void {
for (let y = 0; y < GH; y += 1) {
for (let x = 0; x < GW; x += 1) {
// 인터리브 그라디언트 노이즈 — 좌표만으로 정해지는 0~1 값
const thr = frac(52.9829189 * frac(NOISE_A * x + NOISE_B * y));
if (thr < p) {
const s = Math.sin((x * 0.7 + y * 0.7) * STRIPE_FREQ + t * 0.1);
buf.px[y * GW + x] = mixPack(STRIPE_DARK, STRIPE_LIGHT, smooth(s * 1.5 + 0.5));
} else {
const s = Math.sin(Math.hypot(x - GW * 0.35, y - GH * 0.55) * RING_FREQ - t * 0.12);
buf.px[y * GW + x] = mixPack(ringLo, ringHi, smooth(s * 1.5 + 0.5));
}
}
}
flush(ctx, buf);
},
label(): string {
if (p < 0.02) {
return TXT_RINGS;
}
return p > 0.98 ? TXT_STRIPES : TXT_MIX;
},
tap(): void {
const c = t % cycle;
t = c < cycle / 2 ? HOLD_FRAMES : 2 * HOLD_FRAMES + FADE_PERIOD;
inp.idle = IDLE_TICKS;
}
};
if (reduce) {
t = HOLD_FRAMES + Math.floor(FADE_PERIOD * 0.5);
scene.step();
}
return scene;
}
export default function DtGradientNoiseDissolve() {
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="화면이 점으로 녹아 다음 장면으로 넘어가는 인터리브 노이즈 전환" />
<p className={styles.sc__status} ref={statusRef} aria-live="polite">고리 장면 — 곧 점으로 녹는다</p>
<button className={styles.sc__btn} ref={btnRef} type="button">멈춤</button>
<p className={styles.sc__caption}>화면이 점으로 녹아 다음 장면으로 넘어가는 인터리브 노이즈 전환</p>
</div>
</main>
);
}04 An Interleaved-Noise Transition That Dissolves One Scene into the Next as Dots — Measured area 75.253% · moving frames 23/23Original by GODRICH · SCSS and React ship in the zip · CSS Dither: 9 Scenes Drawn by Threshold Math
The post this demo lives in
CSS Dither: 9 Scenes Drawn by Threshold MathA css dither throws away every color but two, so why does the gradient look smoother? Scene 01's threshold matrix and sc See all demos in this post
If you like this effect - similar demos
Creative UI02 Stripe bands — one parameter turns dots into lines9 Reaction Diffusion Simulations, No Library
Creative UI07 Chain lightning — hopping from one target point to the next9 Lightning Effect Background Scenes, No WebGL
Creative UI02 Marching squares — the 16-case table that links the boundary into an outline9 Metaball Effect Scenes, Marching Squares Canvas