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tune: 작은 기호의 원운동(굴러다님) 억제 #8

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Merged
99mini merged 1 commit into from
Aug 17, 2026
Merged

tune: 작은 기호의 원운동(굴러다님) 억제 #8

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4 changes: 4 additions & 0 deletions src/lib/constants.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,10 @@ export const SHAPES = {
bouncyRestitution: 0.45,
/** 잘 튀는 글자들의 공기 저항 — 회전·이동을 빨리 잦아들게 해 헛돌기 방지 */
bouncyFrictionAir: 0.04,
/** 잘 튀는 글자들의 표면 마찰 — 바닥에서 미끄러지며 돌아다니지 않게 */
bouncyFriction: 0.6,
/** 회전 관성 배율 — 작은 기호가 바퀴처럼 데굴데굴 구르지 않게 */
bouncyInertiaScale: 8,
bouncyChars: ".,'`·:;\"",
} as const;

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13 changes: 9 additions & 4 deletions src/lib/stage.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
// 물리 월드 + 캔버스 렌더 루프.
// matter.js 기본 렌더러 대신 캔버스에 글자를 직접 그린다 (PRD §6).
import Matter, { type IBodyDefinition } from "matter-js";
import Matter, { type IChamferableBodyDefinition } from "matter-js";

import { MASS, PHYSICS, RENDER, SHAPES, WORLD } from "./constants";

Expand Down Expand Up @@ -130,23 +130,28 @@ export function mountStage(canvas: HTMLCanvasElement, options: StageOptions = {}
const y = -(height / 2) - WORLD.spawnAboveTopPx;

const bouncy = SHAPES.bouncyChars.includes(char);
const bodyOptions: IBodyDefinition = {
const bodyOptions: IChamferableBodyDefinition = {
restitution: bouncy ? SHAPES.bouncyRestitution : PHYSICS.restitution,
friction: PHYSICS.friction,
friction: bouncy ? SHAPES.bouncyFriction : PHYSICS.friction,
frictionAir: bouncy ? SHAPES.bouncyFrictionAir : PHYSICS.frictionAir,
angle: (Math.random() - 0.5) * 0.3,
};

// 원형 글자는 원형 충돌체 — 굴러간다. 나머지는 모서리 깎은 사각형 (PRD §4.2)
// 단 작은 기호는 깎으면 거의 원이 되어 바퀴처럼 굴러다니므로 각지게 둔다
const body = SHAPES.circles.includes(char)
? Bodies.circle(x, y, Math.max(width, height) / 2, bodyOptions)
: Bodies.rectangle(x, y, width, height, {
: Bodies.rectangle(x, y, width, height, bouncy ? bodyOptions : {
...bodyOptions,
chamfer: { radius: Math.min(PHYSICS.chamferRadiusPx, width / 3, height / 3) },
});

// 잉크 면적 기반 질량 — 획이 많은 글자(뷁)는 무겁고, 이·아 는 가볍다
Body.setMass(body, Math.max(MASS.min, measureInkArea(char) * MASS.perInkPixel));
if (bouncy) {
// 회전 관성을 키워 접촉 때마다 팽이처럼 도는 것을 막는다
Body.setInertia(body, body.inertia * SHAPES.bouncyInertiaScale);
}
Composite.add(engine.world, body);
letters.push({ body, char, width, height });

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