02두 점을 잇는 곡선

<main class="stage">
<div class="ng is-demo" id="ng">

  <svg class="ng__svg" id="ngSvg" viewBox="0 0 400 180" role="group" aria-label="두 노드를 잇는 곡선 한 줄">

    <!-- 연결선 — 노드보다 먼저 그려 상자 뒤로 깔린다 -->
    <path class="ng__wire" id="ngWire" fill="none" d="M140,46 C201,46 201,124 262,124"/>

    <!-- 앞 노드 -->
    <g class="ng__node">
      <rect x="12" y="20" width="128" height="52" rx="12"/>
      <svg x="26" y="36" width="20" height="20" viewBox="0 0 256 256" fill="currentColor" class="ng__ico" aria-hidden="true"><path d="M216,80c0,26.51-39.4,48-88,48S40,106.51,40,80s39.4-48,88-48S216,53.49,216,80Z" opacity="0.2"/><path d="M128,24C74.17,24,32,48.6,32,80v96c0,31.4,42.17,56,96,56s96-24.6,96-56V80C224,48.6,181.83,24,128,24Zm80,104c0,9.62-7.88,19.43-21.61,26.92C170.93,163.35,150.19,168,128,168s-42.93-4.65-58.39-13.08C55.88,147.43,48,137.62,48,128V111.36c17.06,15,46.23,24.64,80,24.64s62.94-9.68,80-24.64ZM69.61,53.08C85.07,44.65,105.81,40,128,40s42.93,4.65,58.39,13.08C200.12,60.57,208,70.38,208,80s-7.88,19.43-21.61,26.92C170.93,115.35,150.19,120,128,120s-42.93-4.65-58.39-13.08C55.88,99.43,48,89.62,48,80S55.88,60.57,69.61,53.08ZM186.39,202.92C170.93,211.35,150.19,216,128,216s-42.93-4.65-58.39-13.08C55.88,195.43,48,185.62,48,176V159.36c17.06,15,46.23,24.64,80,24.64s62.94-9.68,80-24.64V176C208,185.62,200.12,195.43,186.39,202.92Z"/></svg>
      <text class="ng__nm" x="54" y="46">고객 목록</text>
      <circle class="ng__port ng__port--out" cx="140" cy="46" r="6"/>
    </g>

    <!-- 뒤 노드 — 통째로 밀어 두 점의 가로 거리를 바꾼다 -->
    <g class="ng__node" id="ngNodeB" transform="translate(66,0)">
      <rect x="196" y="98" width="120" height="52" rx="12"/>
      <svg x="210" y="114" width="20" height="20" viewBox="0 0 256 256" fill="currentColor" class="ng__ico" aria-hidden="true"><path d="M223.69,42.18l-58.22,192a8,8,0,0,1-14.92,1.25L108,148,20.58,105.45a8,8,0,0,1,1.25-14.92l192-58.22A8,8,0,0,1,223.69,42.18Z" opacity="0.2"/><path d="M227.32,28.68a16,16,0,0,0-15.66-4.08l-.15,0L19.57,82.84a16,16,0,0,0-2.49,29.8L102,154l41.3,84.87A15.86,15.86,0,0,0,157.74,248q.69,0,1.38-.06a15.88,15.88,0,0,0,14-11.51l58.2-191.94c0-.05,0-.1,0-.15A16,16,0,0,0,227.32,28.68ZM157.83,231.85l-.05.14,0-.07-40.06-82.3,48-48a8,8,0,0,0-11.31-11.31l-48,48L24.08,98.25l-.07,0,.14,0L216,40Z"/></svg>
      <text class="ng__nm" x="238" y="124">메일 보내기</text>
      <circle class="ng__port ng__port--in" cx="196" cy="124" r="6"/>
    </g>

    <text class="ng__cap" x="14" y="170"><tspan class="ng__capk">가로 거리</tspan><tspan class="ng__capv" id="ngDx" dx="8">122</tspan><tspan class="ng__capk" dx="14">손잡이</tspan><tspan class="ng__capv" id="ngH" dx="8">61</tspan></text>
  </svg>

  <div class="ng__bar">
    <button type="button" class="ng__btn" id="ngNear" aria-pressed="false">가깝게</button>
    <button type="button" class="ng__btn is-on" id="ngFar" aria-pressed="true">멀게</button>
  </div>

</div>
</main>

@use "../../../../site/static/demo-tokens" as *;

$duration: $dur-loop;
$easing: $ease-out;
$color: $stage-yellow;

@include stage($stage-ink);

.ng { box-sizing: border-box; width: min(100%, 432px); display: flex; flex-direction: column; gap: $sp-3; }

.ng__svg { display: block; width: 100%; height: auto; }

// 노드 상자 — 어두운 무대 위 크림 카드
.ng__node rect { fill: $subject-cream; stroke: rgba(23, 20, 26, .35); stroke-width: 1; }
.ng__node .ng__ico { color: $subject-ink; }
.ng__nm { font-weight: 800; font-size: 12px; fill: $subject-ink; dominant-baseline: central; }

.ng__port { stroke: $subject-cream; stroke-width: 2; }
.ng__port--out { fill: $stage-orange; }
.ng__port--in  { fill: $subject-blue; }

// 연결선 — 끝을 둥글게 잘라 포트 원과 이가 맞는다
.ng__wire {
  stroke: $color; stroke-width: 6; stroke-linecap: round;
  // 점선 한 칸 = 선 전체 길이. JS 가 getTotalLength() 로 잰 값을 --len 에 넣는다
  stroke-dasharray: var(--len);
  stroke-dashoffset: 0;
}

.ng__cap { font-size: 12px; }
.ng__capk { font-weight: 600; fill: rgba(255, 247, 230, .78); }
.ng__capv { font-weight: 800; fill: $color; }

.ng__bar { display: flex; justify-content: center; gap: $sp-2; }
.ng__btn {
  font-family: inherit; font-weight: 700; font-size: clamp(9px, 2.6vw, 11px); line-height: 1.6;
  padding: $sp-1 $sp-4; border-radius: $r-pill; cursor: pointer;
  background: none; border: 1px solid rgba(255, 247, 230, .55); color: $subject-cream;
  transition: background $dur-quick $easing, color $dur-quick $easing;
}
.ng__btn.is-on { background: $subject-cream; border-color: $subject-cream; color: $subject-ink; }

// ── 미리보기 루프: 선이 왼쪽에서 오른쪽으로 그려졌다가 88% 에 도로 감긴다
// --len 은 JS 가 getTotalLength() 로 잰 실제 선 길이 (점선 한 칸 = 선 전체)
.ng.is-demo .ng__wire {
  animation-name: ngWireDraw; animation-duration: $duration;
  animation-timing-function: $easing; animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
@keyframes ngWireDraw {
  0%   { stroke-dashoffset: var(--len); }
  60%  { stroke-dashoffset: 0; }
  78%  { stroke-dashoffset: 0; }
  88%  { stroke-dashoffset: var(--len); }
  100% { stroke-dashoffset: var(--len); }
}

// ── 320×200 폰 (값은 내리기만 한다)
@media (max-width: 340px), (max-height: 220px) {
  .ng { gap: $sp-1; }
  .ng__btn { padding: 0 $sp-3; }
}

@media (prefers-reduced-motion: reduce) {
  .ng.is-demo .ng__wire { animation-name: none !important; stroke-dashoffset: 0 !important; }
  .ng__btn { transition: none !important; }
}

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);
}

.ng {
  box-sizing: border-box;
  width: min(100%, 432px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ng__svg {
  display: block;
  width: 100%;
  height: auto;
}

.ng__node rect {
  fill: #fff7e6;
  stroke: rgba(23, 20, 26, 0.35);
  stroke-width: 1;
}

.ng__node .ng__ico {
  color: #17141a;
}

.ng__nm {
  font-weight: 800;
  font-size: 12px;
  fill: #17141a;
  dominant-baseline: central;
}

.ng__port {
  stroke: #fff7e6;
  stroke-width: 2;
}

.ng__port--out {
  fill: #ff4d1f;
}

.ng__port--in {
  fill: #2f6df6;
}

.ng__wire {
  stroke: #ffd23f;
  stroke-width: 6;
  stroke-linecap: round;
  stroke-dasharray: var(--len);
  stroke-dashoffset: 0;
}

.ng__cap {
  font-size: 12px;
}

.ng__capk {
  font-weight: 600;
  fill: rgba(255, 247, 230, 0.78);
}

.ng__capv {
  font-weight: 800;
  fill: #ffd23f;
}

.ng__bar {
  display: flex;
  justify-content: center;
  gap: 8px;
}

.ng__btn {
  font-family: inherit;
  font-weight: 700;
  font-size: clamp(9px, 2.6vw, 11px);
  line-height: 1.6;
  padding: 4px 16px;
  border-radius: 999px;
  cursor: pointer;
  background: none;
  border: 1px solid rgba(255, 247, 230, 0.55);
  color: #fff7e6;
  transition: background 220ms ease-out, color 220ms ease-out;
}

.ng__btn.is-on {
  background: #fff7e6;
  border-color: #fff7e6;
  color: #17141a;
}

.ng.is-demo .ng__wire {
  animation-name: ngWireDraw;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

@keyframes ngWireDraw {
  0% {
    stroke-dashoffset: var(--len);
  }
  60% {
    stroke-dashoffset: 0;
  }
  78% {
    stroke-dashoffset: 0;
  }
  88% {
    stroke-dashoffset: var(--len);
  }
  100% {
    stroke-dashoffset: var(--len);
  }
}
@media (max-width: 340px), (max-height: 220px) {
  .ng {
    gap: 4px;
  }
  .ng__btn {
    padding: 0 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ng.is-demo .ng__wire {
    animation-name: none !important;
    stroke-dashoffset: 0 !important;
  }
  .ng__btn {
    transition: none !important;
  }
}

var ng = document.getElementById('ng');
var wire = document.getElementById('ngWire');
var nodeB = document.getElementById('ngNodeB');
var dxOut = document.getElementById('ngDx');
var handleOut = document.getElementById('ngH');
var nearBtn = document.getElementById('ngNear');
var farBtn = document.getElementById('ngFar');

var OUT = { x: 140, y: 46 };        // 보내는 점
var BASE_IN = { x: 196, y: 124 };   // 뒤 노드가 「가깝게」 자리에 있을 때의 받는 점
var SHIFT = { near: 0, far: 66 };   // 뒤 노드를 오른쪽으로 미는 거리

// 3차 베지어 — 손잡이는 두 점의 가로 거리의 절반, 최소 40.
// 손잡이가 두 점에서 수평으로 뻗으므로 선은 항상 포트 옆구리로 빠진다.
function wirePath(x1, y1, x2, y2) {
  var h = Math.max(40, Math.abs(x2 - x1) * 0.5);
  return { d: 'M' + x1 + ',' + y1 + ' C' + (x1 + h) + ',' + y1 + ' ' + (x2 - h) + ',' + y2 + ' ' + x2 + ',' + y2, handle: h };
}

function layout(shift) {
  nodeB.setAttribute('transform', 'translate(' + shift + ',0)');
  var inX = BASE_IN.x + shift;
  var r = wirePath(OUT.x, OUT.y, inX, BASE_IN.y);
  wire.setAttribute('d', r.d);
  var len = wire.getTotalLength();          // 선 길이를 재서 점선 한 칸으로 만든다
  wire.style.setProperty('--len', len);   // 점선 칸 길이는 scss 가 var(--len) 으로 받는다
  dxOut.textContent = String(inX - OUT.x);
  handleOut.textContent = String(Math.round(r.handle));
}

function pick(kind) {
  ng.classList.remove('is-demo');
  layout(SHIFT[kind]);
  nearBtn.classList.toggle('is-on', kind === 'near');
  farBtn.classList.toggle('is-on', kind === 'far');
  nearBtn.setAttribute('aria-pressed', String(kind === 'near'));
  farBtn.setAttribute('aria-pressed', String(kind === 'far'));
}

nearBtn.addEventListener('click', function () { pick('near'); });
farBtn.addEventListener('click', function () { pick('far'); });
layout(SHIFT.far);

import { useEffect, useRef, useState } from "react";
import styles from "./BezierWire.module.scss";

export type BezierWireProps = { duration?: number; easing?: string; color?: string };

const OUT = { x: 140, y: 46 };        // 보내는 점
const BASE_IN = { x: 196, y: 124 };   // 뒤 노드가 「가깝게」 자리에 있을 때의 받는 점
const SHIFT = { near: 0, far: 66 };   // 뒤 노드를 오른쪽으로 미는 거리

// 3차 베지어 — 손잡이는 두 점의 가로 거리의 절반, 최소 40.
// 손잡이가 두 점에서 수평으로 뻗으므로 선은 항상 포트 옆구리로 빠진다.
function wirePath(x1: number, y1: number, x2: number, y2: number): { d: string; handle: number } {
  const h = Math.max(40, Math.abs(x2 - x1) * 0.5);
  return { d: `M${x1},${y1} C${x1 + h},${y1} ${x2 - h},${y2} ${x2},${y2}`, handle: h };
}

export default function BezierWire({
  duration = 2000,
  easing = "ease-out",
  color = "#ffd23f",
}: BezierWireProps) {
  const [demo, setDemo] = useState(true);
  const [kind, setKind] = useState("far");
  const [len, setLen] = useState(0);
  const wireRef = useRef<SVGPathElement>(null);

  const shift = kind === "far" ? SHIFT.far : SHIFT.near;
  const inX = BASE_IN.x + shift;
  const wire = wirePath(OUT.x, OUT.y, inX, BASE_IN.y);

  useEffect(() => {
    const el = wireRef.current;
    if (el) setLen(el.getTotalLength());   // 선 길이를 재서 점선 한 칸으로 만든다
  }, [wire.d]);

  const pick = (next: string) => { setDemo(false); setKind(next); };

  return (
    <main className={styles.stage}>
      <div className={styles.ng}>
        <svg className={styles.svg} viewBox="0 0 400 180" role="group" aria-label="두 노드를 잇는 곡선 한 줄">

          <path
            ref={wireRef}
            className={styles.wire}
            fill="none"
            d={wire.d}
            style={{
              stroke: color,
              "--len": len,
              ...(demo
                ? {
                    animationName: "ngWireDraw",
                    animationDuration: `${duration}ms`,
                    animationTimingFunction: easing,
                    animationIterationCount: "infinite",
                    animationFillMode: "backwards",
                  }
                : {}),
            }}
          />

          <g className={styles.node}>
            <rect x="12" y="20" width="128" height="52" rx="12"/>
            <svg x="26" y="36" width="20" height="20" viewBox="0 0 256 256" fill="currentColor" className={styles.ico} aria-hidden="true"><path d="M216,80c0,26.51-39.4,48-88,48S40,106.51,40,80s39.4-48,88-48S216,53.49,216,80Z" opacity="0.2"/><path d="M128,24C74.17,24,32,48.6,32,80v96c0,31.4,42.17,56,96,56s96-24.6,96-56V80C224,48.6,181.83,24,128,24Zm80,104c0,9.62-7.88,19.43-21.61,26.92C170.93,163.35,150.19,168,128,168s-42.93-4.65-58.39-13.08C55.88,147.43,48,137.62,48,128V111.36c17.06,15,46.23,24.64,80,24.64s62.94-9.68,80-24.64ZM69.61,53.08C85.07,44.65,105.81,40,128,40s42.93,4.65,58.39,13.08C200.12,60.57,208,70.38,208,80s-7.88,19.43-21.61,26.92C170.93,115.35,150.19,120,128,120s-42.93-4.65-58.39-13.08C55.88,99.43,48,89.62,48,80S55.88,60.57,69.61,53.08ZM186.39,202.92C170.93,211.35,150.19,216,128,216s-42.93-4.65-58.39-13.08C55.88,195.43,48,185.62,48,176V159.36c17.06,15,46.23,24.64,80,24.64s62.94-9.68,80-24.64V176C208,185.62,200.12,195.43,186.39,202.92Z"/></svg>
            <text className={styles.nm} x="54" y="46">고객 목록</text>
            <circle className={styles.portOut} cx="140" cy="46" r="6"/>
          </g>

          <g className={styles.node} transform={`translate(${shift},0)`}>
            <rect x="196" y="98" width="120" height="52" rx="12"/>
            <svg x="210" y="114" width="20" height="20" viewBox="0 0 256 256" fill="currentColor" className={styles.ico} aria-hidden="true"><path d="M223.69,42.18l-58.22,192a8,8,0,0,1-14.92,1.25L108,148,20.58,105.45a8,8,0,0,1,1.25-14.92l192-58.22A8,8,0,0,1,223.69,42.18Z" opacity="0.2"/><path d="M227.32,28.68a16,16,0,0,0-15.66-4.08l-.15,0L19.57,82.84a16,16,0,0,0-2.49,29.8L102,154l41.3,84.87A15.86,15.86,0,0,0,157.74,248q.69,0,1.38-.06a15.88,15.88,0,0,0,14-11.51l58.2-191.94c0-.05,0-.1,0-.15A16,16,0,0,0,227.32,28.68ZM157.83,231.85l-.05.14,0-.07-40.06-82.3,48-48a8,8,0,0,0-11.31-11.31l-48,48L24.08,98.25l-.07,0,.14,0L216,40Z"/></svg>
            <text className={styles.nm} x="238" y="124">메일 보내기</text>
            <circle className={styles.portIn} cx="196" cy="124" r="6"/>
          </g>

          <text className={styles.cap} x="14" y="170">
            <tspan className={styles.capk}>가로 거리</tspan>
            <tspan className={styles.capv} dx="8">{inX - OUT.x}</tspan>
            <tspan className={styles.capk} dx="14">손잡이</tspan>
            <tspan className={styles.capv} dx="8">{Math.round(wire.handle)}</tspan>
          </text>
        </svg>

        <div className={styles.bar}>
          <button
            type="button"
            className={`${styles.btn} ${kind === "near" ? styles.isOn : ""}`}
            aria-pressed={kind === "near"}
            onClick={() => pick("near")}
          >가깝게</button>
          <button
            type="button"
            className={`${styles.btn} ${kind === "far" ? styles.isOn : ""}`}
            aria-pressed={kind === "far"}
            onClick={() => pick("far")}
          >멀게</button>
        </div>
      </div>
    </main>
  );
}