08間違えるたびに歪みの振幅と線の本数が1段階ずつ上がる段階式の確認
失敗回数に段階係数を掛けて振幅と線の本数を決め、上限に届いたらそれ以上は上げない。横の目盛りが同じ失敗回数で今の段階を見せる。
使いどころログイン失敗が重なったときの確認難度の引き上げ
ESCALATE_STEPAMP_MAXLINES_MAXFAIL_LIMIT
<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="間違えるたびに歪みの振幅と線の本数が1段階ずつ上がる段階式の確認"></canvas>
<p class="cp__status" data-role="status" aria-live="polite">デモを準備中</p>
<button class="cp__btn" data-role="btn" type="button">一時停止</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 = '一時停止';
const BTN_PLAY = '再生';
const BTN_NEXT = '次の場面';
// 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 ESCALATE_STEP = 3; // 실패 한 번마다 늘어나는 진폭 (px)
const AMP_MAX = 13; // 진폭 상한 (px)
const LINES_MAX = 6; // 선 수 상한
const FAIL_LIMIT = 5; // 눈금이 가득 차는 실패 횟수
const BASE_AMP = 1.5;
const BX = 16;
const BY = 16;
const BW = 300;
const BH = 268;
const TXT_FAILS = 'ミス {f} 回 · 振幅 {a}、線 {n} 本';
const TXT_CAP = 'ミス {f} 回 · 振幅は上限 {m} で止まる';
// PURE-BEGIN
// 실패 수에 단계 계수를 곱해 진폭과 선 수를 정한다 - 둘 다 상한에서 멈춘다
function distortionFor(fails, stepPx, ampMax, linesMax) {
const amp = Math.min(ampMax, 1.5 + fails * stepPx);
const lines = Math.min(linesMax, 1 + fails);
return { amp: amp, lines: lines };
}
// PURE-END
const make = (inp, reduce) => {
const src = document.createElement('canvas');
src.width = BW;
src.height = BH;
const sctx = src.getContext('2d');
if (!sctx) {
return { CYCLE: 1, REDUCE_TICKS: 0, reset() { return; }, auto() { return; }, step() { return; }, draw() { return; }, label() { return ''; }, down() { return; }, move() { return; }, up() { return; }, key() { return false; } };
}
let seed = 21;
let fails = 0;
let ampNow = BASE_AMP;
let ph = 0;
let shake = 0;
let t = 0;
function bake() {
const text = glyphStr(seed, 5);
const r = lcg(seed * 41 + 7);
const g = sctx.createLinearGradient(0, 0, BW, BH);
g.addColorStop(0, rgba(PANEL, 1));
g.addColorStop(1, rgba(mix(PANEL, LILAC, 0.2), 1));
sctx.fillStyle = g;
sctx.fillRect(0, 0, BW, BH);
sctx.strokeStyle = rgba(SKY, 0.16);
sctx.lineWidth = 3;
for (let y = 10; y < BH; y += 20) {
sctx.beginPath();
sctx.moveTo(0, y);
sctx.lineTo(BW, y);
sctx.stroke();
}
sctx.font = 'bold 76px "Segoe UI", "Noto Sans KR", sans-serif';
sctx.textAlign = 'center';
sctx.textBaseline = 'middle';
const cols = [MINT, PEACH, SKY, PINK, CREAM];
for (let i = 0; i < 5; i += 1) {
sctx.save();
sctx.translate(36 + i * 57, BH / 2 + (r() - 0.5) * 26);
sctx.rotate((r() - 0.5) * 0.5);
sctx.fillStyle = rgba(cols[(i + seed) % cols.length], 1);
sctx.fillText(text.charAt(i), 0, 0);
sctx.restore();
}
}
bake();
function miss() {
fails += 1;
seed += 1;
bake();
shake = 18;
}
const scene = {
CYCLE: 130,
REDUCE_TICKS: 100,
reset() { fails = 0; ampNow = BASE_AMP; seed += 1; bake(); },
auto(clk) {
if (clk === 10 || clk === 28 || clk === 46 || clk === 64 || clk === 82 || clk === 100) {
miss();
}
},
step() {
t += 1;
ph += 0.12;
const d = distortionFor(fails, ESCALATE_STEP, AMP_MAX, LINES_MAX);
ampNow += (d.amp - ampNow) * (reduce ? 1 : 0.2);
if (shake > 0) {
shake -= 1;
}
},
draw(ctx) {
ctx.fillStyle = rgba(BG, 1);
ctx.fillRect(0, 0, W, H);
const d = distortionFor(fails, ESCALATE_STEP, AMP_MAX, LINES_MAX);
const ox = shake > 0 ? Math.sin(shake * 1.7) * shake * 0.5 : 0;
// 글자판 - 세로 4px 조각마다 사인 변위를 다르게 줘 다시 붙인다
ctx.save();
ctx.beginPath();
rrect(ctx, BX + ox, BY, BW, BH, 16);
ctx.clip();
ctx.fillStyle = rgba(PANEL, 1);
ctx.fillRect(BX + ox, BY, BW, BH);
for (let x = 0; x < BW; x += 4) {
const dy = ampNow * Math.sin(x * 0.05 + ph) + ampNow * 0.35 * Math.sin(x * 0.13 - ph * 1.7);
ctx.drawImage(src, x, 0, 4, BH, BX + ox + x, BY + dy, 4, BH);
}
const r = lcg(seed * 3 + 1);
for (let i = 0; i < d.lines; i += 1) {
const y0 = BY + 20 + r() * (BH - 40);
const y1 = BY + 20 + r() * (BH - 40);
const wob = Math.sin(ph * 0.8 + i) * 10;
ctx.strokeStyle = rgba(i % 2 === 0 ? CREAM : PINK, 0.85);
ctx.lineWidth = 2;
ctx.beginPath();
ctx.moveTo(BX + ox, y0 + wob);
ctx.bezierCurveTo(BX + ox + BW * 0.3, y0 - 50 + wob, BX + ox + BW * 0.65, y1 + 50 - wob, BX + ox + BW, y1 - wob);
ctx.stroke();
}
ctx.restore();
ctx.lineWidth = 3;
ctx.strokeStyle = rgba(shake > 0 ? PINK : CREAM, shake > 0 ? 1 : 0.4);
rrect(ctx, BX + ox, BY, BW, BH, 16);
ctx.stroke();
// 눈금 - 실패 횟수만큼 아래서부터 차오른다
for (let k = 0; k < FAIL_LIMIT; k += 1) {
const y = BY + BH - 62 - k * 48;
const on = k < fails;
const col = mix(MINT, PINK, k / (FAIL_LIMIT - 1));
ctx.fillStyle = on ? rgba(col, 1) : rgba(CREAM, 0.18);
rrect(ctx, 344, y, 120, 38, 12);
ctx.fill();
if (on && k === Math.min(fails, FAIL_LIMIT) - 1 && shake > 0) {
ctx.strokeStyle = rgba(CREAM, shake / 18);
ctx.lineWidth = 3;
rrect(ctx, 340, y - 4, 128, 46, 14);
ctx.stroke();
}
}
if (inp.key && inp.focus) {
ctx.strokeStyle = 'rgba(255,255,255,0.92)';
ctx.lineWidth = 2.5;
ctx.strokeRect(6, 6, W - 12, H - 12);
}
},
label() {
const d = distortionFor(fails, ESCALATE_STEP, AMP_MAX, LINES_MAX);
if (d.amp >= AMP_MAX) {
return TXT_CAP.replace('{f}', String(fails)).replace('{m}', String(AMP_MAX));
}
return TXT_FAILS.replace('{f}', String(fails)).replace('{a}', String(Math.round(d.amp * 10) / 10)).replace('{n}', String(d.lines));
},
down() { miss(); },
move() { return; },
up() { return; },
key(k) {
if (k === 'Enter' || k === ' ') {
miss();
return true;
}
if (k === 'Backspace' || k === 'Escape') {
fails = 0;
seed += 1;
bake();
return true;
}
return false;
},
};
return scene;
};
return mount(root, make);
})();// CapFailEscalateDistortionMeter - vanilla 판(08-cap-fail-escalate-distortion-meter) 의 React 포트. 같은 계산을 useEffect 안에서 돌린다.
import { useEffect, useRef } from "react";
import styles from "./CapFailEscalateDistortionMeter.module.scss";
const cx = (s: string): string => s.split(" ").map((n) => styles[n] ?? n).join(" ");
export default function CapFailEscalateDistortionMeter() {
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 ESCALATE_STEP = 3; // 실패 한 번마다 늘어나는 진폭 (px)
const AMP_MAX = 13; // 진폭 상한 (px)
const LINES_MAX = 6; // 선 수 상한
const FAIL_LIMIT = 5; // 눈금이 가득 차는 실패 횟수
const BASE_AMP = 1.5;
const BX = 16;
const BY = 16;
const BW = 300;
const BH = 268;
const TXT_FAILS = '실패 {f}회 — 진폭 {a}, 선 {n}개';
const TXT_CAP = '실패 {f}회 — 진폭 상한 {m}에서 멈춤';
// PURE-BEGIN
// 실패 수에 단계 계수를 곱해 진폭과 선 수를 정한다 - 둘 다 상한에서 멈춘다
function distortionFor(fails: number, stepPx: number, ampMax: number, linesMax: number): { amp: number; lines: number } {
const amp = Math.min(ampMax, 1.5 + fails * stepPx);
const lines = Math.min(linesMax, 1 + fails);
return { amp: amp, lines: lines };
}
// PURE-END
const make: Make = (inp, reduce) => {
const src = document.createElement('canvas');
src.width = BW;
src.height = BH;
const sctx = src.getContext('2d') as CanvasRenderingContext2D;
if (!sctx) {
return { CYCLE: 1, REDUCE_TICKS: 0, reset() { return; }, auto() { return; }, step() { return; }, draw() { return; }, label() { return ''; }, down() { return; }, move() { return; }, up() { return; }, key() { return false; } };
}
let seed = 21;
let fails = 0;
let ampNow = BASE_AMP;
let ph = 0;
let shake = 0;
let t = 0;
function bake(): void {
const text = glyphStr(seed, 5);
const r = lcg(seed * 41 + 7);
const g = sctx.createLinearGradient(0, 0, BW, BH);
g.addColorStop(0, rgba(PANEL, 1));
g.addColorStop(1, rgba(mix(PANEL, LILAC, 0.2), 1));
sctx.fillStyle = g;
sctx.fillRect(0, 0, BW, BH);
sctx.strokeStyle = rgba(SKY, 0.16);
sctx.lineWidth = 3;
for (let y = 10; y < BH; y += 20) {
sctx.beginPath();
sctx.moveTo(0, y);
sctx.lineTo(BW, y);
sctx.stroke();
}
sctx.font = 'bold 76px "Segoe UI", "Noto Sans KR", sans-serif';
sctx.textAlign = 'center';
sctx.textBaseline = 'middle';
const cols = [MINT, PEACH, SKY, PINK, CREAM];
for (let i = 0; i < 5; i += 1) {
sctx.save();
sctx.translate(36 + i * 57, BH / 2 + (r() - 0.5) * 26);
sctx.rotate((r() - 0.5) * 0.5);
sctx.fillStyle = rgba(cols[(i + seed) % cols.length], 1);
sctx.fillText(text.charAt(i), 0, 0);
sctx.restore();
}
}
bake();
function miss(): void {
fails += 1;
seed += 1;
bake();
shake = 18;
}
const scene: Scene = {
CYCLE: 130,
REDUCE_TICKS: 100,
reset() { fails = 0; ampNow = BASE_AMP; seed += 1; bake(); },
auto(clk) {
if (clk === 10 || clk === 28 || clk === 46 || clk === 64 || clk === 82 || clk === 100) { miss(); }
},
step() {
t += 1;
ph += 0.12;
const d = distortionFor(fails, ESCALATE_STEP, AMP_MAX, LINES_MAX);
ampNow += (d.amp - ampNow) * (reduce ? 1 : 0.2);
if (shake > 0) { shake -= 1; }
},
draw(ctx) {
ctx.fillStyle = rgba(BG, 1);
ctx.fillRect(0, 0, W, H);
const d = distortionFor(fails, ESCALATE_STEP, AMP_MAX, LINES_MAX);
const ox = shake > 0 ? Math.sin(shake * 1.7) * shake * 0.5 : 0;
// 글자판 - 세로 4px 조각마다 사인 변위를 다르게 줘 다시 붙인다
ctx.save();
ctx.beginPath();
rrect(ctx, BX + ox, BY, BW, BH, 16);
ctx.clip();
ctx.fillStyle = rgba(PANEL, 1);
ctx.fillRect(BX + ox, BY, BW, BH);
for (let x = 0; x < BW; x += 4) {
const dy = ampNow * Math.sin(x * 0.05 + ph) + ampNow * 0.35 * Math.sin(x * 0.13 - ph * 1.7);
ctx.drawImage(src, x, 0, 4, BH, BX + ox + x, BY + dy, 4, BH);
}
const r = lcg(seed * 3 + 1);
for (let i = 0; i < d.lines; i += 1) {
const y0 = BY + 20 + r() * (BH - 40);
const y1 = BY + 20 + r() * (BH - 40);
const wob = Math.sin(ph * 0.8 + i) * 10;
ctx.strokeStyle = rgba(i % 2 === 0 ? CREAM : PINK, 0.85);
ctx.lineWidth = 2;
ctx.beginPath();
ctx.moveTo(BX + ox, y0 + wob);
ctx.bezierCurveTo(BX + ox + BW * 0.3, y0 - 50 + wob, BX + ox + BW * 0.65, y1 + 50 - wob, BX + ox + BW, y1 - wob);
ctx.stroke();
}
ctx.restore();
ctx.lineWidth = 3;
ctx.strokeStyle = rgba(shake > 0 ? PINK : CREAM, shake > 0 ? 1 : 0.4);
rrect(ctx, BX + ox, BY, BW, BH, 16);
ctx.stroke();
// 눈금 - 실패 횟수만큼 아래서부터 차오른다
for (let k = 0; k < FAIL_LIMIT; k += 1) {
const y = BY + BH - 62 - k * 48;
const on = k < fails;
const col = mix(MINT, PINK, k / (FAIL_LIMIT - 1));
ctx.fillStyle = on ? rgba(col, 1) : rgba(CREAM, 0.18);
rrect(ctx, 344, y, 120, 38, 12);
ctx.fill();
if (on && k === Math.min(fails, FAIL_LIMIT) - 1 && shake > 0) {
ctx.strokeStyle = rgba(CREAM, shake / 18);
ctx.lineWidth = 3;
rrect(ctx, 340, y - 4, 128, 46, 14);
ctx.stroke();
}
}
if (inp.key && inp.focus) {
ctx.strokeStyle = 'rgba(255,255,255,0.92)';
ctx.lineWidth = 2.5;
ctx.strokeRect(6, 6, W - 12, H - 12);
}
},
label() {
const d = distortionFor(fails, ESCALATE_STEP, AMP_MAX, LINES_MAX);
if (d.amp >= AMP_MAX) { return TXT_CAP.replace('{f}', String(fails)).replace('{m}', String(AMP_MAX)); }
return TXT_FAILS.replace('{f}', String(fails)).replace('{a}', String(Math.round(d.amp * 10) / 10)).replace('{n}', String(d.lines));
},
down() { miss(); },
move() { return; },
up() { return; },
key(k) {
if (k === 'Enter' || k === ' ') { miss(); return true; }
if (k === 'Backspace' || k === 'Escape') { fails = 0; seed += 1; bake(); 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="틀릴 때마다 왜곡 진폭과 선 수가 한 단계씩 올라가는 단계형 확인"></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>
);
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