01A Receipt Print Scene Where the Paper Steps One Line at a Time and Shivers Slightly Under the Print Head
The paper is pushed up a fixed distance per line with a small sideways shiver added during each step. Text darkens only after its line finishes, so it reads as printed one line at a time.
Best forStore checkout completion screens and order printout effects
FEED_PXLINE_MSSHIVER_PXPAPER_W
<main class="stage">
<div class="rc is-demo" id="rc">
<canvas class="rc__canvas" data-role="canvas" width="480" height="300" aria-label="A receipt printing one line at a time, the paper stepping up and shivering sideways with each line"></canvas>
<p class="rc__status" data-role="status" aria-live="polite">Printing</p>
<div class="rc__tools">
<button class="rc__btn" data-role="btn" type="button">Print again</button>
</div>
</div>
</main>@use "../../../../site/static/demo-tokens" as *;
@include stage($stage-ink);
.rc {
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;
}
.rc__canvas {
display: block;
width: 100%;
height: 100%;
}
.rc__canvas:focus-visible {
outline: 2px solid rgba(255, 255, 255, .85);
outline-offset: -6px;
}
.rc__status {
position: absolute;
left: $sp-3;
bottom: $sp-3;
max-width: 46%;
margin: 0;
padding: $sp-1 $sp-3;
border-radius: $r-control;
background: rgba(255, 255, 255, .85);
color: $subject-ink;
font-weight: 500;
font-size: 11px;
line-height: 1.4;
pointer-events: none;
}
.rc__tools {
position: absolute;
right: $sp-3;
bottom: $sp-3;
display: flex;
gap: $sp-2;
}
.rc__btn {
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;
}
.rc__btn[aria-pressed="true"] {
background: $subject-mint;
}
.rc__btn:focus-visible {
outline: 2px solid rgba(255, 255, 255, .95);
outline-offset: 2px;
}
@media (max-width: 340px) {
.rc__btn { font-size: 10px; padding: $sp-1 $sp-2; }
.rc__status { font-size: 10px; padding: $sp-1 $sp-2; }
}
@media (prefers-reduced-motion: reduce) {
.rc { cursor: default; }
.rc__chip { 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);
}
.rc {
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;
}
.rc__canvas {
display: block;
width: 100%;
height: 100%;
}
.rc__canvas:focus-visible {
outline: 2px solid rgba(255, 255, 255, 0.85);
outline-offset: -6px;
}
.rc__status {
position: absolute;
left: 12px;
bottom: 12px;
max-width: 46%;
margin: 0;
padding: 4px 12px;
border-radius: 12px;
background: rgba(255, 255, 255, 0.85);
color: #17141a;
font-weight: 500;
font-size: 11px;
line-height: 1.4;
pointer-events: none;
}
.rc__tools {
position: absolute;
right: 12px;
bottom: 12px;
display: flex;
gap: 8px;
}
.rc__btn {
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;
}
.rc__btn[aria-pressed=true] {
background: #4cd4a6;
}
.rc__btn:focus-visible {
outline: 2px solid rgba(255, 255, 255, 0.95);
outline-offset: 2px;
}
@media (max-width: 340px) {
.rc__btn {
font-size: 10px;
padding: 4px 8px;
}
.rc__status {
font-size: 10px;
padding: 4px 8px;
}
}
@media (prefers-reduced-motion: reduce) {
.rc {
cursor: default;
}
.rc__chip {
cursor: default;
}
}(function () {
const root = document.getElementById("rc");
if (!root) return;
const W = 480;
const H = 300;
const FIXED_DT = 16;
// 파스텔 팔레트 — 어두운 무대 위에 밝은 종이를 얹어 명도 차로 읽힌다
const BG = [29, 26, 44];
const PAPER = [255, 248, 234];
const INK = [58, 48, 76];
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];
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 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;
};
}
const canvasEl = root.querySelector('[data-role="canvas"]');
const statusEl = root.querySelector('[data-role="status"]');
const ctxRaw = canvasEl ? canvasEl.getContext('2d') : null;
if (!canvasEl || !ctxRaw || !statusEl) {
return;
}
const cv = canvasEl;
const ctx = ctxRaw;
const status = statusEl;
const reduceQuery = window.matchMedia('(prefers-reduced-motion: reduce)');
function fitCanvas() {
const dpr = window.devicePixelRatio || 1;
cv.width = Math.round(W * dpr);
cv.height = Math.round(H * dpr);
ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
}
function onResize() {
fitCanvas();
if (reduceQuery.matches) {
draw();
}
}
fitCanvas();
window.addEventListener('resize', onResize);
// 화면 좌표(CSS px) → 장면 좌표(480x300). 리사이즈 뒤에도 늘 현재 크기로 다시 잰다
function toScene(ev) {
const r = cv.getBoundingClientRect();
return [((ev.clientX - r.left) / r.width) * W, ((ev.clientY - r.top) / r.height) * H];
}
const PAPER_W = 260;
const FEED_PX = 14;
const LINE_MS = 180;
const SHIVER_PX = 2.4;
const FEED_MS = 140;
const START_MS = 200;
const HOLD_MS = 600;
const OUT_MS = 420;
const OUT_PX = 190;
const DARKEN_MS = 160;
const HEAD_Y = 236;
const TXT_PRINTING = 'Printing';
const TXT_DONE = 'Print complete — total';
const ROWS = [
{ kind: 'title', a: 'Moonlight Shop', b: '' },
{ kind: 'rule', a: '', b: '' },
{ kind: 'item', a: 'Milk', b: '1,200' },
{ kind: 'item', a: 'Bread', b: '2,800' },
{ kind: 'item', a: 'Apples', b: '3,500' },
{ kind: 'item', a: 'Eggs', b: '4,100' },
{ kind: 'rule', a: '', b: '' },
{ kind: 'total', a: 'Total', b: '11,600' },
{ kind: 'note', a: 'Thank you', b: '' },
];
const btn = root.querySelector('[data-role="btn"]');
let phase = 'wait';
let phaseT = 0;
let now = 0;
let lineIdx = 0;
let scroll = 0;
let feedFrom = 0;
const printedAt = [];
const born = [];
function easeOut(k) { const c = clamp(k, 0, 1); return 1 - (1 - c) * (1 - c) * (1 - c); }
// 이어서 밀리는 동안의 가로 떨림 — 시작에 크고 끝으로 갈수록 잦아든다
function shiverAt(k) {
return SHIVER_PX * Math.sin(k * Math.PI * 7) * (1 - k);
}
// 줄 하나의 세로 위치 — 찍힌 순간의 밀림값과 지금 밀림값의 차이만큼 머리에서 멀어진다
function rowY(printedScroll, scrollNow) {
return HEAD_Y - 9 - (scrollNow - printedScroll);
}
function restart() {
lineIdx = 0;
printedAt.length = 0;
born.length = 0;
phase = 'wait';
phaseT = 0;
status.textContent = TXT_PRINTING;
}
function step() {
now += FIXED_DT;
phaseT += FIXED_DT;
if (phase === 'wait') {
if (phaseT >= START_MS) {
phase = 'print';
phaseT = 0;
printedAt[lineIdx] = scroll;
}
}
else if (phase === 'print') {
if (phaseT >= LINE_MS) {
born[lineIdx] = now;
feedFrom = scroll;
phase = 'feed';
phaseT = 0;
}
}
else if (phase === 'feed') {
const k = phaseT / FEED_MS;
scroll = feedFrom + FEED_PX * easeOut(k);
if (k >= 1) {
scroll = feedFrom + FEED_PX;
lineIdx += 1;
phaseT = 0;
if (lineIdx >= ROWS.length) {
phase = 'hold';
status.textContent = TXT_DONE + ' 11,600';
}
else {
phase = 'print';
printedAt[lineIdx] = scroll;
}
}
}
else if (phase === 'hold') {
if (phaseT >= HOLD_MS) {
phase = 'out';
feedFrom = scroll;
phaseT = 0;
}
}
else if (phase === 'out') {
const k = phaseT / OUT_MS;
scroll = feedFrom + OUT_PX * smooth(k);
if (k >= 1) {
scroll = feedFrom + OUT_PX;
restart();
}
}
}
// 움직임 줄이기 — 다 찍힌 영수증을 그대로 놓는다
function settle() {
for (let i = 0; i < ROWS.length; i += 1) {
printedAt[i] = i * FEED_PX;
born[i] = -9999;
}
lineIdx = ROWS.length;
scroll = ROWS.length * FEED_PX;
phase = 'hold';
status.textContent = TXT_DONE + ' 11,600';
}
function shiverNow() {
if (phase === 'feed') {
return shiverAt(phaseT / FEED_MS);
}
if (phase === 'out') {
return shiverAt((phaseT / OUT_MS) % 0.5 * 2) * 0.6;
}
return 0;
}
function draw() {
ctx.fillStyle = rgba(BG, 1);
ctx.fillRect(0, 0, W, H);
// 인쇄기 몸체
const body = ctx.createLinearGradient(0, HEAD_Y, 0, H);
body.addColorStop(0, rgba(mix(BG, LILAC, 0.34), 1));
body.addColorStop(1, rgba(mix(BG, LILAC, 0.1), 1));
ctx.fillStyle = body;
ctx.fillRect(0, HEAD_Y, W, H - HEAD_Y);
const px = (W - PAPER_W) / 2 + shiverNow();
// 종이 — 가장자리 음영과 가로 결이 밀리는 만큼 같이 움직인다
ctx.fillStyle = rgba(BG, 0.5);
ctx.fillRect(px + 6, 0, PAPER_W, HEAD_Y);
const sheet = ctx.createLinearGradient(px, 0, px + PAPER_W, 0);
sheet.addColorStop(0, rgba(mix(PAPER, INK, 0.14), 1));
sheet.addColorStop(0.12, rgba(PAPER, 1));
sheet.addColorStop(0.88, rgba(PAPER, 1));
sheet.addColorStop(1, rgba(mix(PAPER, INK, 0.14), 1));
ctx.fillStyle = sheet;
ctx.fillRect(px, 0, PAPER_W, HEAD_Y);
const off = ((scroll % 8) + 8) % 8;
ctx.fillStyle = rgba(INK, 0.1);
for (let y = off - 8; y < HEAD_Y; y += 8) {
ctx.fillRect(px, y, PAPER_W, 1);
}
// 줄들
ctx.font = '600 12px "Noto Sans KR", ui-monospace, monospace';
ctx.textBaseline = 'alphabetic';
for (let i = 0; i < ROWS.length; i += 1) {
if (printedAt[i] === undefined) {
continue;
}
const y = rowY(printedAt[i], scroll);
if (y < -4 || y > HEAD_Y) {
continue;
}
const done = born[i] !== undefined;
let alpha = 0.3;
if (done) {
alpha = 0.3 + 0.7 * smooth((now - born[i]) / DARKEN_MS);
}
let reveal = 1;
if (!done && i === lineIdx && phase === 'print') {
reveal = clamp(phaseT / LINE_MS, 0, 1);
}
ctx.save();
ctx.beginPath();
ctx.rect(px, y - 14, PAPER_W * reveal, 20);
ctx.clip();
ctx.fillStyle = rgba(INK, alpha);
const r = ROWS[i];
if (r.kind === 'rule') {
ctx.fillRect(px + 18, y - 4, PAPER_W - 36, 1);
}
else if (r.kind === 'title') {
ctx.textAlign = 'center';
ctx.font = '700 14px "Noto Sans KR", ui-monospace, monospace';
ctx.fillText(r.a, px + PAPER_W / 2, y);
}
else if (r.kind === 'note') {
ctx.textAlign = 'center';
ctx.font = '600 12px "Noto Sans KR", ui-monospace, monospace';
ctx.fillText(r.a, px + PAPER_W / 2, y);
}
else {
ctx.font = (r.kind === 'total' ? '700 13px' : '600 12px') + ' "Noto Sans KR", ui-monospace, monospace';
ctx.textAlign = 'left';
ctx.fillText(r.a, px + 18, y);
ctx.textAlign = 'right';
ctx.fillText(r.b, px + PAPER_W - 18, y);
}
ctx.restore();
}
// 인쇄 머리 — 찍는 동안 한 줄이 달아오른다
ctx.fillStyle = rgba(mix(BG, LILAC, 0.5), 1);
ctx.fillRect(px - 14, HEAD_Y - 2, PAPER_W + 28, 12);
const heat = phase === 'print' ? 0.55 + 0.45 * Math.sin(now / 24) : 0.12;
const glow = ctx.createLinearGradient(0, HEAD_Y - 14, 0, HEAD_Y + 4);
glow.addColorStop(0, rgba(PEACH, 0));
glow.addColorStop(0.7, rgba(PEACH, 0.5 * heat));
glow.addColorStop(1, rgba(PINK, 0.9 * heat));
ctx.fillStyle = glow;
ctx.fillRect(px, HEAD_Y - 14, PAPER_W, 18);
// 종이 나오는 틈
ctx.fillStyle = rgba(BG, 0.9);
ctx.fillRect(px - 14, HEAD_Y + 10, PAPER_W + 28, 4);
}
if (btn) {
btn.addEventListener('click', function () {
if (reduceQuery.matches) {
settle();
draw();
return;
}
restart();
});
}
let rafId = 0;
let lastTs = -1;
let acc = 0;
function frame(ts) {
if (lastTs < 0) {
lastTs = ts;
}
acc += Math.min(ts - lastTs, 100);
lastTs = ts;
let n = 0;
while (acc >= FIXED_DT && n < 6) {
step();
acc -= FIXED_DT;
n += 1;
}
draw();
rafId = window.requestAnimationFrame(frame);
}
if (reduceQuery.matches) {
settle();
draw();
}
else {
rafId = window.requestAnimationFrame(frame);
}
return function () {
window.cancelAnimationFrame(rafId);
window.removeEventListener('resize', onResize);
};
})();// RecThermalHeadLineFeedJitter - vanilla 판(01-rec-thermal-head-line-feed-jitter) 의 React 포트. 같은 계산을 useEffect 안에서 돌린다.
import { useEffect, useRef } from "react";
import styles from "./RecThermalHeadLineFeedJitter.module.scss";
const cx = (s: string): string => s.split(" ").map((n) => styles[n] ?? n).join(" ");
export default function RecThermalHeadLineFeedJitter() {
const rootRef = useRef<HTMLDivElement | null>(null);
useEffect(() => {
const rootEl = rootRef.current;
if (!rootEl) return;
const root: HTMLElement = rootEl;
type RGB = [number, number, number];
const W = 480;
const H = 300;
const FIXED_DT = 16;
// 파스텔 팔레트 — 어두운 무대 위에 밝은 종이를 얹어 명도 차로 읽힌다
const BG: RGB = [29, 26, 44];
const PAPER: RGB = [255, 248, 234];
const INK: RGB = [58, 48, 76];
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];
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 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 (): number {
s = (Math.imul(s, 1664525) + 1013904223) >>> 0;
return s / 4294967296;
};
}
const canvasEl = root.querySelector('[data-role="canvas"]') as HTMLCanvasElement | null;
const statusEl = root.querySelector('[data-role="status"]') as HTMLElement | null;
const ctxRaw = canvasEl ? canvasEl.getContext('2d') : null;
if (!canvasEl || !ctxRaw || !statusEl) { return; }
const cv: HTMLCanvasElement = canvasEl;
const ctx: CanvasRenderingContext2D = ctxRaw;
const status: HTMLElement = statusEl;
const reduceQuery = window.matchMedia('(prefers-reduced-motion: reduce)');
function fitCanvas(): void {
const dpr = window.devicePixelRatio || 1;
cv.width = Math.round(W * dpr);
cv.height = Math.round(H * dpr);
ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
}
function onResize(): void {
fitCanvas();
if (reduceQuery.matches) { draw(); }
}
fitCanvas();
window.addEventListener('resize', onResize);
// 화면 좌표(CSS px) → 장면 좌표(480x300). 리사이즈 뒤에도 늘 현재 크기로 다시 잰다
function toScene(ev: PointerEvent): [number, number] {
const r = cv.getBoundingClientRect();
return [((ev.clientX - r.left) / r.width) * W, ((ev.clientY - r.top) / r.height) * H];
}
const PAPER_W = 260;
const FEED_PX = 14;
const LINE_MS = 180;
const SHIVER_PX = 2.4;
const FEED_MS = 140;
const START_MS = 200;
const HOLD_MS = 600;
const OUT_MS = 420;
const OUT_PX = 190;
const DARKEN_MS = 160;
const HEAD_Y = 236;
const TXT_PRINTING = '인쇄 중';
const TXT_DONE = '인쇄 완료 — 합계';
interface Row { kind: string; a: string; b: string; }
const ROWS: Row[] = [
{ kind: 'title', a: '달빛 상점', b: '' },
{ kind: 'rule', a: '', b: '' },
{ kind: 'item', a: '우유', b: '1,200' },
{ kind: 'item', a: '식빵', b: '2,800' },
{ kind: 'item', a: '사과', b: '3,500' },
{ kind: 'item', a: '달걀', b: '4,100' },
{ kind: 'rule', a: '', b: '' },
{ kind: 'total', a: '합계', b: '11,600' },
{ kind: 'note', a: '감사합니다', b: '' },
];
const btn = root.querySelector('[data-role="btn"]') as HTMLButtonElement | null;
let phase = 'wait';
let phaseT = 0;
let now = 0;
let lineIdx = 0;
let scroll = 0;
let feedFrom = 0;
const printedAt: number[] = [];
const born: number[] = [];
function easeOut(k: number): number { const c = clamp(k, 0, 1); return 1 - (1 - c) * (1 - c) * (1 - c); }
// 이어서 밀리는 동안의 가로 떨림 — 시작에 크고 끝으로 갈수록 잦아든다
function shiverAt(k: number): number {
return SHIVER_PX * Math.sin(k * Math.PI * 7) * (1 - k);
}
// 줄 하나의 세로 위치 — 찍힌 순간의 밀림값과 지금 밀림값의 차이만큼 머리에서 멀어진다
function rowY(printedScroll: number, scrollNow: number): number {
return HEAD_Y - 9 - (scrollNow - printedScroll);
}
function restart(): void {
lineIdx = 0;
printedAt.length = 0;
born.length = 0;
phase = 'wait';
phaseT = 0;
status.textContent = TXT_PRINTING;
}
function step(): void {
now += FIXED_DT;
phaseT += FIXED_DT;
if (phase === 'wait') {
if (phaseT >= START_MS) { phase = 'print'; phaseT = 0; printedAt[lineIdx] = scroll; }
} else if (phase === 'print') {
if (phaseT >= LINE_MS) { born[lineIdx] = now; feedFrom = scroll; phase = 'feed'; phaseT = 0; }
} else if (phase === 'feed') {
const k = phaseT / FEED_MS;
scroll = feedFrom + FEED_PX * easeOut(k);
if (k >= 1) {
scroll = feedFrom + FEED_PX;
lineIdx += 1;
phaseT = 0;
if (lineIdx >= ROWS.length) {
phase = 'hold';
status.textContent = TXT_DONE + ' 11,600';
} else {
phase = 'print';
printedAt[lineIdx] = scroll;
}
}
} else if (phase === 'hold') {
if (phaseT >= HOLD_MS) { phase = 'out'; feedFrom = scroll; phaseT = 0; }
} else if (phase === 'out') {
const k = phaseT / OUT_MS;
scroll = feedFrom + OUT_PX * smooth(k);
if (k >= 1) { scroll = feedFrom + OUT_PX; restart(); }
}
}
// 움직임 줄이기 — 다 찍힌 영수증을 그대로 놓는다
function settle(): void {
for (let i = 0; i < ROWS.length; i += 1) { printedAt[i] = i * FEED_PX; born[i] = -9999; }
lineIdx = ROWS.length;
scroll = ROWS.length * FEED_PX;
phase = 'hold';
status.textContent = TXT_DONE + ' 11,600';
}
function shiverNow(): number {
if (phase === 'feed') { return shiverAt(phaseT / FEED_MS); }
if (phase === 'out') { return shiverAt((phaseT / OUT_MS) % 0.5 * 2) * 0.6; }
return 0;
}
function draw(): void {
ctx.fillStyle = rgba(BG, 1);
ctx.fillRect(0, 0, W, H);
// 인쇄기 몸체
const body = ctx.createLinearGradient(0, HEAD_Y, 0, H);
body.addColorStop(0, rgba(mix(BG, LILAC, 0.34), 1));
body.addColorStop(1, rgba(mix(BG, LILAC, 0.1), 1));
ctx.fillStyle = body;
ctx.fillRect(0, HEAD_Y, W, H - HEAD_Y);
const px = (W - PAPER_W) / 2 + shiverNow();
// 종이 — 가장자리 음영과 가로 결이 밀리는 만큼 같이 움직인다
ctx.fillStyle = rgba(BG, 0.5);
ctx.fillRect(px + 6, 0, PAPER_W, HEAD_Y);
const sheet = ctx.createLinearGradient(px, 0, px + PAPER_W, 0);
sheet.addColorStop(0, rgba(mix(PAPER, INK, 0.14), 1));
sheet.addColorStop(0.12, rgba(PAPER, 1));
sheet.addColorStop(0.88, rgba(PAPER, 1));
sheet.addColorStop(1, rgba(mix(PAPER, INK, 0.14), 1));
ctx.fillStyle = sheet;
ctx.fillRect(px, 0, PAPER_W, HEAD_Y);
const off = ((scroll % 8) + 8) % 8;
ctx.fillStyle = rgba(INK, 0.1);
for (let y = off - 8; y < HEAD_Y; y += 8) { ctx.fillRect(px, y, PAPER_W, 1); }
// 줄들
ctx.font = '600 12px "Noto Sans KR", ui-monospace, monospace';
ctx.textBaseline = 'alphabetic';
for (let i = 0; i < ROWS.length; i += 1) {
if (printedAt[i] === undefined) { continue; }
const y = rowY(printedAt[i], scroll);
if (y < -4 || y > HEAD_Y) { continue; }
const done = born[i] !== undefined;
let alpha = 0.3;
if (done) { alpha = 0.3 + 0.7 * smooth((now - born[i]) / DARKEN_MS); }
let reveal = 1;
if (!done && i === lineIdx && phase === 'print') { reveal = clamp(phaseT / LINE_MS, 0, 1); }
ctx.save();
ctx.beginPath();
ctx.rect(px, y - 14, PAPER_W * reveal, 20);
ctx.clip();
ctx.fillStyle = rgba(INK, alpha);
const r = ROWS[i];
if (r.kind === 'rule') {
ctx.fillRect(px + 18, y - 4, PAPER_W - 36, 1);
} else if (r.kind === 'title') {
ctx.textAlign = 'center';
ctx.font = '700 14px "Noto Sans KR", ui-monospace, monospace';
ctx.fillText(r.a, px + PAPER_W / 2, y);
} else if (r.kind === 'note') {
ctx.textAlign = 'center';
ctx.font = '600 12px "Noto Sans KR", ui-monospace, monospace';
ctx.fillText(r.a, px + PAPER_W / 2, y);
} else {
ctx.font = (r.kind === 'total' ? '700 13px' : '600 12px') + ' "Noto Sans KR", ui-monospace, monospace';
ctx.textAlign = 'left';
ctx.fillText(r.a, px + 18, y);
ctx.textAlign = 'right';
ctx.fillText(r.b, px + PAPER_W - 18, y);
}
ctx.restore();
}
// 인쇄 머리 — 찍는 동안 한 줄이 달아오른다
ctx.fillStyle = rgba(mix(BG, LILAC, 0.5), 1);
ctx.fillRect(px - 14, HEAD_Y - 2, PAPER_W + 28, 12);
const heat = phase === 'print' ? 0.55 + 0.45 * Math.sin(now / 24) : 0.12;
const glow = ctx.createLinearGradient(0, HEAD_Y - 14, 0, HEAD_Y + 4);
glow.addColorStop(0, rgba(PEACH, 0));
glow.addColorStop(0.7, rgba(PEACH, 0.5 * heat));
glow.addColorStop(1, rgba(PINK, 0.9 * heat));
ctx.fillStyle = glow;
ctx.fillRect(px, HEAD_Y - 14, PAPER_W, 18);
// 종이 나오는 틈
ctx.fillStyle = rgba(BG, 0.9);
ctx.fillRect(px - 14, HEAD_Y + 10, PAPER_W + 28, 4);
}
if (btn) {
btn.addEventListener('click', function (): void {
if (reduceQuery.matches) { settle(); draw(); return; }
restart();
});
}
let rafId = 0;
let lastTs = -1;
let acc = 0;
function frame(ts: number): void {
if (lastTs < 0) { lastTs = ts; }
acc += Math.min(ts - lastTs, 100);
lastTs = ts;
let n = 0;
while (acc >= FIXED_DT && n < 6) {
step();
acc -= FIXED_DT;
n += 1;
}
draw();
rafId = window.requestAnimationFrame(frame);
}
if (reduceQuery.matches) {
settle();
draw();
} else {
rafId = window.requestAnimationFrame(frame);
}
return function (): void {
window.cancelAnimationFrame(rafId);
window.removeEventListener('resize', onResize);
};
}, []);
return (
<div className={cx("rc") + " is-demo"} ref={rootRef}>
<canvas className={cx("rc__canvas")} data-role="canvas" width={480} height={300} aria-label="영수증이 한 줄씩 인쇄되며 줄마다 종이가 밀려 올라가고 가로로 떨리는 장면"></canvas>
<p className={cx("rc__status")} data-role="status" aria-live="polite">인쇄 중</p>
<div className={cx("rc__tools")}>
<button className={cx("rc__btn")} data-role="btn" type="button">다시 인쇄</button>
</div>
</div>
);
}01 A Receipt Print Scene Where the Paper Steps One Line at a Time and Shivers Slightly Under the Print Head — Measured area 23.613% · moving frames 23/23Original by GODRICH · SCSS and React ship in the zip · CSS Receipt: 9 Thermal Print and Tear-Off Scenes
The post this demo lives in
CSS Receipt: 9 Thermal Print and Tear-Off ScenesA css receipt layers print-head shiver, paper curl and a rolling total — scene 01 adds a tremor to each line step, and s See all demos in this post
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