06A Check Button Where the Box Turns Into a Ring, Spins, and Resolves Into a Tick
The state moves through waiting, checking and passed, and the corner radius that turns the box into a ring and the rotation angle are carried together on one easing value.
Best forA check box under a login form and a human check on a contact form
RING_RSPIN_MSMORPH_EASEPASS_DELAY
<main class="stage">
<div class="cp is-demo" id="cp">
<canvas class="cp__canvas" data-role="canvas" width="480" height="300" tabindex="0" aria-label="A Check Button Where the Box Turns Into a Ring, Spins, and Resolves Into a Tick"></canvas>
<p class="cp__status" data-role="status" aria-live="polite">Starting the demo</p>
<button class="cp__btn" data-role="btn" type="button">Pause</button>
</div>
</main>@use "../../../../site/static/demo-tokens" as *;
@include stage($stage-ink);
.cp {
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;
}
.cp__canvas {
display: block;
width: 100%;
height: 100%;
touch-action: none;
}
.cp__canvas:focus-visible {
outline: 2px solid rgba(255, 255, 255, .85);
outline-offset: -6px;
}
.cp__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;
}
.cp__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-family: inherit;
font-weight: 500;
font-size: 12px;
line-height: 1.4;
cursor: pointer;
}
.cp__btn:focus-visible {
outline: 2px solid #ffffff;
outline-offset: 2px;
}
@media (max-width: 340px) {
.cp__btn { font-size: 10px; padding: $sp-1 $sp-2; }
.cp__status { font-size: 10px; }
}
@media (prefers-reduced-motion: reduce) {
.cp { 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);
}
.cp {
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;
}
.cp__canvas {
display: block;
width: 100%;
height: 100%;
touch-action: none;
}
.cp__canvas:focus-visible {
outline: 2px solid rgba(255, 255, 255, 0.85);
outline-offset: -6px;
}
.cp__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;
}
.cp__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-family: inherit;
font-weight: 500;
font-size: 12px;
line-height: 1.4;
cursor: pointer;
}
.cp__btn:focus-visible {
outline: 2px solid #ffffff;
outline-offset: 2px;
}
@media (max-width: 340px) {
.cp__btn {
font-size: 10px;
padding: 4px 8px;
}
.cp__status {
font-size: 10px;
}
}
@media (prefers-reduced-motion: reduce) {
.cp {
cursor: default;
}
}(function () {
const root = document.getElementById("cp");
if (!root)
return;
const W = 480;
const H = 300;
const PI2 = Math.PI * 2;
const FIXED_DT = 16;
const IDLE_TICKS = 150;
const BTN_PAUSE = 'Pause';
const BTN_PLAY = 'Play';
const BTN_NEXT = 'Next scene';
// 파스텔 팔레트 - 어두운 판 위에 밝은 색을 얹어 명도 차로 읽힌다
const BG = [29, 26, 44];
const PANEL = [44, 40, 68];
const MINT = [126, 226, 192];
const SKY = [124, 196, 255];
const LILAC = [190, 164, 255];
const PINK = [255, 160, 190];
const PEACH = [255, 208, 168];
const CREAM = [255, 244, 224];
const CHARSET = 'ABCDEFGHJKLMNPQRSTUVWXYZabdefghmnqrt23456789';
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 easeOutBack(x) { const c = clamp(x, 0, 1) - 1; return 1 + c * c * (2.7 * c + 1.7); }
function rgba(c, a) {
return 'rgba(' + Math.round(c[0]) + ',' + Math.round(c[1]) + ',' + Math.round(c[2]) + ',' + clamp(a, 0, 1).toFixed(3) + ')';
}
function mix(a, b, k) {
return [lerp(a[0], b[0], k), lerp(a[1], b[1], k), lerp(a[2], b[2], k)];
}
// 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;
};
}
// 정수 두 개와 시드로 0 이상 1 미만의 값을 만드는 해시 (같은 입력은 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;
}
// 시드로 뜻 없는 글자열을 만든다
function glyphStr(seed, n) {
const r = lcg(seed * 7919 + 13);
let s = '';
for (let i = 0; i < n; i += 1) {
s += CHARSET.charAt(Math.floor(r() * CHARSET.length));
}
return s;
}
function rrect(ctx, x, y, w, h, r) {
const rr = Math.max(0, Math.min(r, w / 2, h / 2));
ctx.beginPath();
ctx.moveTo(x + rr, y);
ctx.lineTo(x + w - rr, y);
ctx.arcTo(x + w, y, x + w, y + rr, rr);
ctx.lineTo(x + w, y + h - rr);
ctx.arcTo(x + w, y + h, x + w - rr, y + h, rr);
ctx.lineTo(x + rr, y + h);
ctx.arcTo(x, y + h, x, y + h - rr, rr);
ctx.lineTo(x, y + rr);
ctx.arcTo(x, y, x + rr, y, rr);
ctx.closePath();
}
function mount(root, make) {
const canvas = root.querySelector('[data-role="canvas"]');
const statusEl = root.querySelector('[data-role="status"]');
const btnEl = root.querySelector('[data-role="btn"]');
if (!canvas || !statusEl || !btnEl) {
return function () { return; };
}
const ctx = canvas.getContext('2d');
if (!ctx) {
return function () { return; };
}
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 = { idle: 99999, focus: false, key: false };
const scene = make(inp, reduce);
let paused = false;
let rafId = 0;
let lastTs = -1;
let accMs = 0;
let lastLabel = '';
let lastLabelTick = -999;
let lastLive = 'polite';
let tickN = 0;
let clk = 0;
let wasAuto = true;
const cleaners = [];
function listen(target, type, fn) {
target.addEventListener(type, fn);
cleaners.push(function () { target.removeEventListener(type, fn); });
}
function show() {
scene.draw(ctx);
// 시연이 혼자 돌 때는 낭독을 끄고, 사람이 만지는 동안은 값이 바뀌어도 0.7초에 한 번만 갱신한다
const live = (reduce || inp.idle <= IDLE_TICKS) ? 'polite' : 'off';
if (live !== lastLive) {
lastLive = live;
statusEl.setAttribute('aria-live', live);
}
const t = scene.label();
if (t !== lastLabel && (reduce || live === 'off' || tickN - lastLabelTick >= 44)) {
lastLabel = t;
lastLabelTick = tickN;
statusEl.textContent = t;
}
}
// 고정 간격 한 틱 - 입력이 없으면 시연 스크립트가 같은 입구로 입력을 대신 넣는다
function advance() {
inp.idle += 1;
tickN += 1;
const a = inp.idle > IDLE_TICKS;
if (a && !wasAuto) {
scene.reset();
clk = 0;
}
wasAuto = a;
if (a) {
clk += 1;
scene.auto(clk);
if (clk >= scene.CYCLE) {
clk = 0;
scene.reset();
}
}
scene.step();
}
// 움직임 줄이기: 틱을 몰아서 돌린 뒤 한 번만 그린다 (중간 보간 장면은 화면에 나오지 않는다)
function settle(n) {
for (let i = 0; i < n; i += 1) {
inp.idle = 0;
tickN += 1;
scene.step();
}
show();
}
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) {
advance();
accMs -= FIXED_DT;
}
show();
}
rafId = requestAnimationFrame(tick);
}
function point(e) {
const r = canvas.getBoundingClientRect();
return [clamp((e.clientX - r.left) * W / r.width, 0, W), clamp((e.clientY - r.top) * H / r.height, 0, H)];
}
btnEl.textContent = reduce ? BTN_NEXT : BTN_PAUSE;
if (reduce) {
root.classList.remove('is-demo');
for (let i = 0; i < scene.REDUCE_TICKS; i += 1) {
advance();
}
show();
}
listen(btnEl, 'click', function () {
if (reduce) {
if (scene.next) {
scene.next();
show();
return;
}
const n = Math.round(scene.CYCLE / 3);
inp.idle = 99999;
wasAuto = true;
for (let i = 0; i < n; i += 1) {
advance();
}
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, 'focus', function () { inp.focus = true; if (reduce) {
show();
} });
listen(canvas, 'blur', function () { inp.focus = false; inp.key = false; if (reduce) {
show();
} });
listen(canvas, 'pointerdown', function (e) {
const p = point(e);
inp.idle = 0;
inp.key = false;
try {
canvas.setPointerCapture(e.pointerId);
}
catch (err) { /* 캡처가 안 되는 환경은 그냥 넘어간다 */ }
scene.down(p[0], p[1]);
if (reduce) {
settle(30);
}
});
listen(canvas, 'pointermove', function (e) {
const p = point(e);
inp.idle = 0;
inp.key = false;
scene.move(p[0], p[1]);
if (reduce) {
settle(30);
}
});
listen(canvas, 'pointerup', function (e) {
const p = point(e);
inp.idle = 0;
scene.up(p[0], p[1]);
if (reduce) {
settle(30);
}
});
listen(canvas, 'keydown', function (e) {
inp.idle = 0;
inp.key = true;
if (scene.key(e.key)) {
e.preventDefault();
}
if (reduce) {
settle(30);
}
});
if (!reduce) {
rafId = requestAnimationFrame(tick);
}
return function () {
cancelAnimationFrame(rafId);
for (let i = 0; i < cleaners.length; i += 1) {
cleaners[i]();
}
};
}
const RING_R = 32; // 고리일 때 반경 (px) - 정사각형 한 변 64px 의 절반이라 이 값에서 원이 된다
const BOX_R = 12; // 체크 칸일 때 모서리 반경 (px)
const SPIN_MS = 560; // 고리 안에서 호가 도는 시간
const MORPH_MS = 360; // 칸 -> 고리, 고리 -> 칸 한 번에 걸리는 시간
const MORPH_EASE = 2.6; // 이징 지수 (클수록 가운데가 급하다)
const PASS_DELAY = 180; // 호가 멈춘 뒤 칸으로 돌아가기 전 잠깐 Pause (ms)
const IDLE_MS = 140;
const ROWS = 3;
const BX = 104;
const TXT_WAIT = 'Waiting';
const TXT_CHECKING = 'Checking';
const TXT_PASSED = 'Passed';
const TXT_COUNT = 'Done {p} / {n}';
// PURE-BEGIN
// 지수 이징 - 앞 절반은 천천히 오르고 뒤 절반은 천천히 멈춘다
function easeInOutPow(x, e) {
const c = x < 0 ? 0 : (x > 1 ? 1 : x);
return c < 0.5 ? 0.5 * Math.pow(2 * c, e) : 1 - 0.5 * Math.pow(2 * (1 - c), e);
}
// 한 줄의 경과 시간(ms)으로 모양을 정한다. e 하나가 모서리 반경과 회전각을 함께 끈다
function rowShape(u, boxR, ringR, morphMs, spinMs, delayMs, idleMs, ease) {
const t1 = idleMs;
const t2 = t1 + morphMs;
const t3 = t2 + spinMs;
const t4 = t3 + delayMs;
const t5 = t4 + morphMs;
let e = 0;
let spin = -1;
let check = 0;
let phase = 0;
if (u < t1) {
e = 0;
}
else if (u < t2) {
e = easeInOutPow((u - t1) / morphMs, ease);
phase = 1;
}
else if (u < t3) {
e = 1;
spin = (u - t2) / spinMs;
phase = 1;
}
else if (u < t4) {
e = 1;
phase = 1;
}
else if (u < t5) {
e = 1 - easeInOutPow((u - t4) / morphMs, ease);
phase = 1;
check = clamp01((u - t4) / morphMs - 0.35) / 0.65;
}
else {
e = 0;
check = 1;
phase = 2;
}
return { r: boxR + (ringR - boxR) * e, rot: e * Math.PI * 0.5, e: e, spin: spin, check: check, phase: phase, total: t5 };
}
function clamp01(v) { return v < 0 ? 0 : (v > 1 ? 1 : v); }
// PURE-END
const make = (inp, reduce) => {
const rowT = [];
const startAt = [0, 100, 200];
let cur = 0;
let t = 0;
function shapeOf(k) {
return rowShape(rowT[k], BOX_R, RING_R, MORPH_MS, SPIN_MS, PASS_DELAY, IDLE_MS, MORPH_EASE);
}
function clear() {
rowT.length = 0;
for (let k = 0; k < ROWS; k += 1) {
rowT.push(-1);
}
}
clear();
function begin(k) {
if (reduce) {
// 움직임 줄이기: 중간 모양 없이 끝 상태와 처음 상태만 번갈아 보인다
rowT[k] = rowT[k] >= shapeOf0().total ? -1 : shapeOf0().total;
return;
}
rowT[k] = 0;
}
function shapeOf0() { return rowShape(0, BOX_R, RING_R, MORPH_MS, SPIN_MS, PASS_DELAY, IDLE_MS, MORPH_EASE); }
function rowY(k) { return 62 + k * 88; }
const scene = {
CYCLE: 126,
REDUCE_TICKS: 100,
reset() { clear(); },
auto(clk) {
for (let k = 0; k < ROWS; k += 1) {
if (clk === 4 + Math.round(startAt[k] / FIXED_DT)) {
rowT[k] = 0;
}
}
},
step() {
t += 1;
for (let k = 0; k < ROWS; k += 1) {
if (rowT[k] >= 0) {
rowT[k] = Math.min(rowT[k] + FIXED_DT, shapeOf0().total + 1);
}
}
},
draw(ctx) {
ctx.fillStyle = rgba(BG, 1);
ctx.fillRect(0, 0, W, H);
ctx.font = 'bold 22px "Segoe UI", "Noto Sans KR", sans-serif';
ctx.textBaseline = 'middle';
ctx.textAlign = 'left';
for (let k = 0; k < ROWS; k += 1) {
const y = rowY(k);
ctx.fillStyle = rgba(PANEL, 1);
rrect(ctx, 20, y - 40, W - 40, 80, 16);
ctx.fill();
const s = rowT[k] < 0 ? null : shapeOf(k);
const e = s ? s.e : 0;
const r = s ? s.r : BOX_R;
const rot = s ? s.rot : 0;
const check = s ? s.check : 0;
const col = s ? (s.phase === 2 ? MINT : (s.spin >= 0 ? LILAC : mix(CREAM, SKY, e))) : CREAM;
// 칸 - 모서리 반경이 커져 고리가 되고 회전각이 함께 따라온다
ctx.save();
ctx.translate(BX, y);
ctx.rotate(rot);
const fill = clamp(check * (1 - e), 0, 1);
if (fill > 0) {
ctx.fillStyle = rgba(MINT, fill);
rrect(ctx, -32, -32, 64, 64, r);
ctx.fill();
}
ctx.lineWidth = 5 - e * 1.5;
ctx.strokeStyle = rgba(col, 1);
rrect(ctx, -32, -32, 64, 64, r);
ctx.stroke();
ctx.restore();
if (s && s.spin >= 0) {
// 호 - 고리 안쪽을 한 바퀴 반 돈다
const a0 = s.spin * PI2 * 1.5;
ctx.lineWidth = 6;
ctx.lineCap = 'round';
ctx.strokeStyle = rgba(CREAM, 1);
ctx.beginPath();
ctx.arc(BX, y, 20, a0, a0 + 1.7);
ctx.stroke();
}
if (check > 0) {
// 체크 - 두 꼭짓점을 이은 꺾은선을 진행도만큼만 그린다
const p1 = [BX - 14, y + 1];
const p2 = [BX - 4, y + 12];
const p3 = [BX + 16, y - 12];
const l1 = Math.hypot(p2[0] - p1[0], p2[1] - p1[1]);
const l2 = Math.hypot(p3[0] - p2[0], p3[1] - p2[1]);
const run = (l1 + l2) * clamp(check, 0, 1);
ctx.lineWidth = 7;
ctx.lineCap = 'round';
ctx.lineJoin = 'round';
ctx.strokeStyle = rgba(BG, 1);
ctx.beginPath();
ctx.moveTo(p1[0], p1[1]);
if (run <= l1) {
ctx.lineTo(lerp(p1[0], p2[0], run / l1), lerp(p1[1], p2[1], run / l1));
}
else {
ctx.lineTo(p2[0], p2[1]);
const q = (run - l1) / l2;
ctx.lineTo(lerp(p2[0], p3[0], q), lerp(p2[1], p3[1], q));
}
ctx.stroke();
}
const word = !s ? TXT_WAIT : (s.phase === 2 ? TXT_PASSED : TXT_CHECKING);
ctx.fillStyle = rgba(s && s.phase === 2 ? MINT : CREAM, s ? 1 : 0.7);
ctx.fillText(word, 168, y);
// 오른쪽 진행 막대
const prog = s ? clamp(rowT[k] / s.total, 0, 1) : 0;
ctx.fillStyle = rgba(CREAM, 0.22);
rrect(ctx, 320, y - 5, 120, 10, 5);
ctx.fill();
ctx.fillStyle = rgba(s && s.phase === 2 ? MINT : LILAC, 1);
rrect(ctx, 320, y - 5, Math.max(0, 120 * prog), 10, 5);
ctx.fill();
if (inp.key && inp.focus && cur === k) {
ctx.strokeStyle = 'rgba(255,255,255,0.95)';
ctx.lineWidth = 2.5;
rrect(ctx, 22, y - 38, W - 44, 76, 14);
ctx.stroke();
}
}
},
label() {
let p = 0;
for (let k = 0; k < ROWS; k += 1) {
if (rowT[k] >= 0 && shapeOf(k).phase === 2) {
p += 1;
}
}
return TXT_COUNT.replace('{p}', String(p)).replace('{n}', String(ROWS));
},
down(x, y) {
for (let k = 0; k < ROWS; k += 1) {
if (Math.abs(y - rowY(k)) <= 40) {
cur = k;
begin(k);
}
}
},
move() { return; },
up() { return; },
key(k) {
if (k === 'ArrowUp') {
cur = Math.max(0, cur - 1);
return true;
}
if (k === 'ArrowDown') {
cur = Math.min(ROWS - 1, cur + 1);
return true;
}
if (k === 'Enter' || k === ' ') {
begin(cur);
return true;
}
return false;
},
};
return scene;
};
return mount(root, make);
})();// CapCheckboxRingSpinnerCheckMorph - vanilla 판(06-cap-checkbox-ring-spinner-check-morph) 의 React 포트. 같은 계산을 useEffect 안에서 돌린다.
import { useEffect, useRef } from "react";
import styles from "./CapCheckboxRingSpinnerCheckMorph.module.scss";
const cx = (s: string): string => s.split(" ").map((n) => styles[n] ?? n).join(" ");
export default function CapCheckboxRingSpinnerCheckMorph() {
const rootRef = useRef<HTMLDivElement | null>(null);
useEffect(() => {
const root = rootRef.current;
if (!root) return;
type RGB = [number, number, number];
interface Input { idle: number; focus: boolean; key: boolean; }
interface Scene {
CYCLE: number;
REDUCE_TICKS: number;
reset(): void;
auto(clk: number): void;
step(): void;
draw(ctx: CanvasRenderingContext2D): void;
label(): string;
down(x: number, y: number): void;
move(x: number, y: number): void;
up(x: number, y: number): void;
key(k: string): boolean;
next?(): void;
}
type Make = (inp: Input, reduce: boolean) => Scene;
const W = 480;
const H = 300;
const PI2 = Math.PI * 2;
const FIXED_DT = 16;
const IDLE_TICKS = 150;
const BTN_PAUSE = '멈춤';
const BTN_PLAY = '재생';
const BTN_NEXT = '다음 장면';
// 파스텔 팔레트 - 어두운 판 위에 밝은 색을 얹어 명도 차로 읽힌다
const BG: RGB = [29, 26, 44];
const PANEL: RGB = [44, 40, 68];
const MINT: RGB = [126, 226, 192];
const SKY: RGB = [124, 196, 255];
const LILAC: RGB = [190, 164, 255];
const PINK: RGB = [255, 160, 190];
const PEACH: RGB = [255, 208, 168];
const CREAM: RGB = [255, 244, 224];
const CHARSET = 'ABCDEFGHJKLMNPQRSTUVWXYZabdefghmnqrt23456789';
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 easeOutBack(x: number): number { const c = clamp(x, 0, 1) - 1; return 1 + c * c * (2.7 * c + 1.7); }
function rgba(c: RGB, a: number): string {
return 'rgba(' + Math.round(c[0]) + ',' + Math.round(c[1]) + ',' + Math.round(c[2]) + ',' + clamp(a, 0, 1).toFixed(3) + ')';
}
function mix(a: RGB, b: RGB, k: number): RGB {
return [lerp(a[0], b[0], k), lerp(a[1], b[1], k), lerp(a[2], b[2], k)];
}
// 시드 고정 난수 - 같은 시드면 언제나 같은 수열 (선형 합동 방식)
function lcg(seed: number): () => number {
let s = seed >>> 0;
return function () {
s = (Math.imul(s, 1664525) + 1013904223) >>> 0;
return s / 4294967296;
};
}
// 정수 두 개와 시드로 0 이상 1 미만의 값을 만드는 해시 (같은 입력은 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;
}
// 시드로 뜻 없는 글자열을 만든다
function glyphStr(seed: number, n: number): string {
const r = lcg(seed * 7919 + 13);
let s = '';
for (let i = 0; i < n; i += 1) {
s += CHARSET.charAt(Math.floor(r() * CHARSET.length));
}
return s;
}
function rrect(ctx: CanvasRenderingContext2D, x: number, y: number, w: number, h: number, r: number): void {
const rr = Math.max(0, Math.min(r, w / 2, h / 2));
ctx.beginPath();
ctx.moveTo(x + rr, y);
ctx.lineTo(x + w - rr, y);
ctx.arcTo(x + w, y, x + w, y + rr, rr);
ctx.lineTo(x + w, y + h - rr);
ctx.arcTo(x + w, y + h, x + w - rr, y + h, rr);
ctx.lineTo(x + rr, y + h);
ctx.arcTo(x, y + h, x, y + h - rr, rr);
ctx.lineTo(x, y + rr);
ctx.arcTo(x, y, x + rr, y, rr);
ctx.closePath();
}
function mount(root: HTMLElement, make: Make): () => void {
const canvas = root.querySelector('[data-role="canvas"]') as HTMLCanvasElement;
const statusEl = root.querySelector('[data-role="status"]') as HTMLElement;
const btnEl = root.querySelector('[data-role="btn"]') as HTMLButtonElement;
if (!canvas || !statusEl || !btnEl) {
return function () { return; };
}
const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
if (!ctx) {
return function () { return; };
}
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 = { idle: 99999, focus: false, key: false };
const scene = make(inp, reduce);
let paused = false;
let rafId = 0;
let lastTs = -1;
let accMs = 0;
let lastLabel = '';
let lastLabelTick = -999;
let lastLive = 'polite';
let tickN = 0;
let clk = 0;
let wasAuto = true;
const cleaners: Array<() => void> = [];
function listen<K extends keyof HTMLElementEventMap>(target: HTMLElement, type: K, fn: (e: HTMLElementEventMap[K]) => void): void {
target.addEventListener(type, fn);
cleaners.push(function () { target.removeEventListener(type, fn); });
}
function show(): void {
scene.draw(ctx);
// 시연이 혼자 돌 때는 낭독을 끄고, 사람이 만지는 동안은 값이 바뀌어도 0.7초에 한 번만 갱신한다
const live = (reduce || inp.idle <= IDLE_TICKS) ? 'polite' : 'off';
if (live !== lastLive) {
lastLive = live;
statusEl.setAttribute('aria-live', live);
}
const t = scene.label();
if (t !== lastLabel && (reduce || live === 'off' || tickN - lastLabelTick >= 44)) {
lastLabel = t;
lastLabelTick = tickN;
statusEl.textContent = t;
}
}
// 고정 간격 한 틱 - 입력이 없으면 시연 스크립트가 같은 입구로 입력을 대신 넣는다
function advance(): void {
inp.idle += 1;
tickN += 1;
const a = inp.idle > IDLE_TICKS;
if (a && !wasAuto) {
scene.reset();
clk = 0;
}
wasAuto = a;
if (a) {
clk += 1;
scene.auto(clk);
if (clk >= scene.CYCLE) {
clk = 0;
scene.reset();
}
}
scene.step();
}
// 움직임 줄이기: 틱을 몰아서 돌린 뒤 한 번만 그린다 (중간 보간 장면은 화면에 나오지 않는다)
function settle(n: number): void {
for (let i = 0; i < n; i += 1) {
inp.idle = 0;
tickN += 1;
scene.step();
}
show();
}
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) {
advance();
accMs -= FIXED_DT;
}
show();
}
rafId = requestAnimationFrame(tick);
}
function point(e: PointerEvent): number[] {
const r = canvas.getBoundingClientRect();
return [clamp((e.clientX - r.left) * W / r.width, 0, W), clamp((e.clientY - r.top) * H / r.height, 0, H)];
}
btnEl.textContent = reduce ? BTN_NEXT : BTN_PAUSE;
if (reduce) {
root.classList.remove('is-demo');
for (let i = 0; i < scene.REDUCE_TICKS; i += 1) {
advance();
}
show();
}
listen(btnEl, 'click', function () {
if (reduce) {
if (scene.next) {
scene.next();
show();
return;
}
const n = Math.round(scene.CYCLE / 3);
inp.idle = 99999;
wasAuto = true;
for (let i = 0; i < n; i += 1) {
advance();
}
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, 'focus', function () { inp.focus = true; if (reduce) { show(); } });
listen(canvas, 'blur', function () { inp.focus = false; inp.key = false; if (reduce) { show(); } });
listen(canvas, 'pointerdown', function (e) {
const p = point(e);
inp.idle = 0;
inp.key = false;
try { canvas.setPointerCapture(e.pointerId); } catch (err) { /* 캡처가 안 되는 환경은 그냥 넘어간다 */ }
scene.down(p[0], p[1]);
if (reduce) { settle(30); }
});
listen(canvas, 'pointermove', function (e) {
const p = point(e);
inp.idle = 0;
inp.key = false;
scene.move(p[0], p[1]);
if (reduce) { settle(30); }
});
listen(canvas, 'pointerup', function (e) {
const p = point(e);
inp.idle = 0;
scene.up(p[0], p[1]);
if (reduce) { settle(30); }
});
listen(canvas, 'keydown', function (e) {
inp.idle = 0;
inp.key = true;
if (scene.key(e.key)) {
e.preventDefault();
}
if (reduce) { settle(30); }
});
if (!reduce) {
rafId = requestAnimationFrame(tick);
}
return function () {
cancelAnimationFrame(rafId);
for (let i = 0; i < cleaners.length; i += 1) {
cleaners[i]();
}
};
}
const RING_R = 32; // 고리일 때 반경 (px) - 정사각형 한 변 64px 의 절반이라 이 값에서 원이 된다
const BOX_R = 12; // 체크 칸일 때 모서리 반경 (px)
const SPIN_MS = 560; // 고리 안에서 호가 도는 시간
const MORPH_MS = 360; // 칸 -> 고리, 고리 -> 칸 한 번에 걸리는 시간
const MORPH_EASE = 2.6; // 이징 지수 (클수록 가운데가 급하다)
const PASS_DELAY = 180; // 호가 멈춘 뒤 칸으로 돌아가기 전 잠깐 멈춤 (ms)
const IDLE_MS = 140;
const ROWS = 3;
const BX = 104;
const TXT_WAIT = '대기';
const TXT_CHECKING = '확인 중';
const TXT_PASSED = '통과';
const TXT_COUNT = '완료 {p} / {n}';
interface RowShape { r: number; rot: number; e: number; spin: number; check: number; phase: number; total: number; }
// PURE-BEGIN
// 지수 이징 - 앞 절반은 천천히 오르고 뒤 절반은 천천히 멈춘다
function easeInOutPow(x: number, e: number): number {
const c = x < 0 ? 0 : (x > 1 ? 1 : x);
return c < 0.5 ? 0.5 * Math.pow(2 * c, e) : 1 - 0.5 * Math.pow(2 * (1 - c), e);
}
// 한 줄의 경과 시간(ms)으로 모양을 정한다. e 하나가 모서리 반경과 회전각을 함께 끈다
function rowShape(u: number, boxR: number, ringR: number, morphMs: number, spinMs: number, delayMs: number, idleMs: number, ease: number): RowShape {
const t1 = idleMs;
const t2 = t1 + morphMs;
const t3 = t2 + spinMs;
const t4 = t3 + delayMs;
const t5 = t4 + morphMs;
let e = 0;
let spin = -1;
let check = 0;
let phase = 0;
if (u < t1) { e = 0; }
else if (u < t2) { e = easeInOutPow((u - t1) / morphMs, ease); phase = 1; }
else if (u < t3) { e = 1; spin = (u - t2) / spinMs; phase = 1; }
else if (u < t4) { e = 1; phase = 1; }
else if (u < t5) { e = 1 - easeInOutPow((u - t4) / morphMs, ease); phase = 1; check = clamp01((u - t4) / morphMs - 0.35) / 0.65; }
else { e = 0; check = 1; phase = 2; }
return { r: boxR + (ringR - boxR) * e, rot: e * Math.PI * 0.5, e: e, spin: spin, check: check, phase: phase, total: t5 };
}
function clamp01(v: number): number { return v < 0 ? 0 : (v > 1 ? 1 : v); }
// PURE-END
const make: Make = (inp, reduce) => {
const rowT: number[] = [];
const startAt = [0, 100, 200];
let cur = 0;
let t = 0;
function shapeOf(k: number): RowShape {
return rowShape(rowT[k], BOX_R, RING_R, MORPH_MS, SPIN_MS, PASS_DELAY, IDLE_MS, MORPH_EASE);
}
function clear(): void {
rowT.length = 0;
for (let k = 0; k < ROWS; k += 1) { rowT.push(-1); }
}
clear();
function begin(k: number): void {
if (reduce) {
// 움직임 줄이기: 중간 모양 없이 끝 상태와 처음 상태만 번갈아 보인다
rowT[k] = rowT[k] >= shapeOf0().total ? -1 : shapeOf0().total;
return;
}
rowT[k] = 0;
}
function shapeOf0(): RowShape { return rowShape(0, BOX_R, RING_R, MORPH_MS, SPIN_MS, PASS_DELAY, IDLE_MS, MORPH_EASE); }
function rowY(k: number): number { return 62 + k * 88; }
const scene: Scene = {
CYCLE: 126,
REDUCE_TICKS: 100,
reset() { clear(); },
auto(clk) {
for (let k = 0; k < ROWS; k += 1) {
if (clk === 4 + Math.round(startAt[k] / FIXED_DT)) { rowT[k] = 0; }
}
},
step() {
t += 1;
for (let k = 0; k < ROWS; k += 1) {
if (rowT[k] >= 0) { rowT[k] = Math.min(rowT[k] + FIXED_DT, shapeOf0().total + 1); }
}
},
draw(ctx) {
ctx.fillStyle = rgba(BG, 1);
ctx.fillRect(0, 0, W, H);
ctx.font = 'bold 22px "Segoe UI", "Noto Sans KR", sans-serif';
ctx.textBaseline = 'middle';
ctx.textAlign = 'left';
for (let k = 0; k < ROWS; k += 1) {
const y = rowY(k);
ctx.fillStyle = rgba(PANEL, 1);
rrect(ctx, 20, y - 40, W - 40, 80, 16);
ctx.fill();
const s = rowT[k] < 0 ? null : shapeOf(k);
const e = s ? s.e : 0;
const r = s ? s.r : BOX_R;
const rot = s ? s.rot : 0;
const check = s ? s.check : 0;
const col = s ? (s.phase === 2 ? MINT : (s.spin >= 0 ? LILAC : mix(CREAM, SKY, e))) : CREAM;
// 칸 - 모서리 반경이 커져 고리가 되고 회전각이 함께 따라온다
ctx.save();
ctx.translate(BX, y);
ctx.rotate(rot);
const fill = clamp(check * (1 - e), 0, 1);
if (fill > 0) {
ctx.fillStyle = rgba(MINT, fill);
rrect(ctx, -32, -32, 64, 64, r);
ctx.fill();
}
ctx.lineWidth = 5 - e * 1.5;
ctx.strokeStyle = rgba(col, 1);
rrect(ctx, -32, -32, 64, 64, r);
ctx.stroke();
ctx.restore();
if (s && s.spin >= 0) {
// 호 - 고리 안쪽을 한 바퀴 반 돈다
const a0 = s.spin * PI2 * 1.5;
ctx.lineWidth = 6;
ctx.lineCap = 'round';
ctx.strokeStyle = rgba(CREAM, 1);
ctx.beginPath();
ctx.arc(BX, y, 20, a0, a0 + 1.7);
ctx.stroke();
}
if (check > 0) {
// 체크 - 두 꼭짓점을 이은 꺾은선을 진행도만큼만 그린다
const p1 = [BX - 14, y + 1];
const p2 = [BX - 4, y + 12];
const p3 = [BX + 16, y - 12];
const l1 = Math.hypot(p2[0] - p1[0], p2[1] - p1[1]);
const l2 = Math.hypot(p3[0] - p2[0], p3[1] - p2[1]);
const run = (l1 + l2) * clamp(check, 0, 1);
ctx.lineWidth = 7;
ctx.lineCap = 'round';
ctx.lineJoin = 'round';
ctx.strokeStyle = rgba(BG, 1);
ctx.beginPath();
ctx.moveTo(p1[0], p1[1]);
if (run <= l1) {
ctx.lineTo(lerp(p1[0], p2[0], run / l1), lerp(p1[1], p2[1], run / l1));
}
else {
ctx.lineTo(p2[0], p2[1]);
const q = (run - l1) / l2;
ctx.lineTo(lerp(p2[0], p3[0], q), lerp(p2[1], p3[1], q));
}
ctx.stroke();
}
const word = !s ? TXT_WAIT : (s.phase === 2 ? TXT_PASSED : TXT_CHECKING);
ctx.fillStyle = rgba(s && s.phase === 2 ? MINT : CREAM, s ? 1 : 0.7);
ctx.fillText(word, 168, y);
// 오른쪽 진행 막대
const prog = s ? clamp(rowT[k] / s.total, 0, 1) : 0;
ctx.fillStyle = rgba(CREAM, 0.22);
rrect(ctx, 320, y - 5, 120, 10, 5);
ctx.fill();
ctx.fillStyle = rgba(s && s.phase === 2 ? MINT : LILAC, 1);
rrect(ctx, 320, y - 5, Math.max(0, 120 * prog), 10, 5);
ctx.fill();
if (inp.key && inp.focus && cur === k) {
ctx.strokeStyle = 'rgba(255,255,255,0.95)';
ctx.lineWidth = 2.5;
rrect(ctx, 22, y - 38, W - 44, 76, 14);
ctx.stroke();
}
}
},
label() {
let p = 0;
for (let k = 0; k < ROWS; k += 1) {
if (rowT[k] >= 0 && shapeOf(k).phase === 2) { p += 1; }
}
return TXT_COUNT.replace('{p}', String(p)).replace('{n}', String(ROWS));
},
down(x, y) {
for (let k = 0; k < ROWS; k += 1) {
if (Math.abs(y - rowY(k)) <= 40) { cur = k; begin(k); }
}
},
move() { return; },
up() { return; },
key(k) {
if (k === 'ArrowUp') { cur = Math.max(0, cur - 1); return true; }
if (k === 'ArrowDown') { cur = Math.min(ROWS - 1, cur + 1); return true; }
if (k === 'Enter' || k === ' ') { begin(cur); return true; }
return false;
},
};
return scene;
};
return mount(root, make);
}, []);
return (
<div className={cx("cp") + " is-demo"} id="cp" ref={rootRef}>
<canvas className={cx("cp__canvas")} data-role="canvas" width="480" height="300" tabIndex={0} aria-label="체크 칸이 고리로 바뀌어 돌다가 체크 표시로 이어지는 확인 버튼"></canvas>
<p className={cx("cp__status")} data-role="status" aria-live="polite">시연 준비 중</p>
<button className={cx("cp__btn")} data-role="btn" type="button">멈춤</button>
</div>
);
}06 A Check Button Where the Box Turns Into a Ring, Spins, and Resolves Into a Tick — Measured area 12.18% · moving frames 23/23Original by GODRICH · SCSS and React ship in the zip · CSS Captcha: 9 Warped Text and Rotate Checks
The post this demo lives in
CSS Captcha: 9 Warped Text and Rotate ChecksCall it a human check, but a css captcha is arithmetic on screen — scene 01 slides glyph columns along a sine wave and s See all demos in this post
If you like this effect - similar demos
Auth UI04 Success morph — on a successful match, the fingerprint icon's path value interpolates smoothly into a checkmark path valueFingerprint Scan Animation: 9 Biometric UI Demos
Auth UI08 Keyboard Path Where a Shortcut Toggle Brightens the Focus RingShow Password Toggle Icon: 9 Reveal Patterns
Auth UI04 Magic link — a sent-confirmation card that recomputes remaining time into a ring's arc length9 Login UI Design Patterns (Copy-Paste)