From 793bfd720525f7f1f14a507e1c962101db5ef283 Mon Sep 17 00:00:00 2001
From: Yasutake Yohei <61961825+yasutakeyohei@users.noreply.github.com>
Date: Sun, 4 Oct 2026 23:48:24 +0900
Subject: bluebey-studio: まえがみをM字に修正し、わけめを削除、眉のUIを整理
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---
 public/bluebey-studio/src/faceArt.js | 82 ++++++++----------------------------
 1 file changed, 18 insertions(+), 64 deletions(-)

(limited to 'public/bluebey-studio/src/faceArt.js')

diff --git a/public/bluebey-studio/src/faceArt.js b/public/bluebey-studio/src/faceArt.js
index ba748f5..1f7c4ee 100644
--- a/public/bluebey-studio/src/faceArt.js
+++ b/public/bluebey-studio/src/faceArt.js
@@ -835,7 +835,7 @@ function drawCheeks(ctx, spec) {
  */
 function drawHeadCover(ctx, spec, limits) {
   const shape = spec?.shape ?? 'off';
-  if (shape === 'off' || shape === 'none' || shape === 'wave') return;
+  if (shape === 'off' || shape === 'none' || shape === 'wave' || shape === 'side') return;
 
   const size = clamp(spec.size ?? 1, 0.02, 3);
   const left = limits.left;
@@ -867,18 +867,19 @@ function drawHeadCover(ctx, spec, limits) {
   const halfSpan = width / 2;
   const boundary = (x) => {
     const t = clamp((x - cx) / halfSpan, -1, 1);
-    // まえがみ: 富士額 / M字 (a widow's peak).
+    // まえがみ: 富士額 / M字 (a widow's peak). The covering dips to a point at
+    // the centre and at the two temples, receding in between - the two valleys
+    // and three points of an "M". The points scale with `size`, so a smaller
+    // まえがみ is a smaller M rather than a thin band with a tall spike.
     if (shape === 'fringe') {
-      const m = (1 + Math.cos(2 * Math.PI * t)) / 2;
-      const peak = Math.max(0, 1 - Math.abs(t) * 3);
-      return base + 300 * m + 160 * peak;
+      const dip = (x, centre, reach) => Math.max(0, 1 - Math.abs(x - centre) / reach);
+      const shape01 = Math.max(dip(t, 0, 0.36), 0.6 * Math.max(dip(t, -0.82, 0.26), dip(t, 0.82, 0.26)));
+      return base + 190 * size * shape01;
     }
     // はちわれ: the same V upside down - a widow's peak.
     if (shape === 'fringe-up') return base - 320 * Math.max(0, 1 - Math.abs(t) * 1.5);
     // カーブ: a plain shallow curve, higher (more hair) round the sides.
     if (shape === 'curve') return base + 160 * t * t;
-    // わけめ: a 7:3 parting - a step at 30% from the left.
-    if (shape === 'side') return base + 60 - 320 / (1 + Math.exp(-(t + 0.4) * 10));
     // `cap`: a rounded helmet, lowest in the middle.
     return base - 100 * (1 - t * t);
   };
@@ -894,23 +895,6 @@ function drawHeadCover(ctx, spec, limits) {
   ctx.closePath();
   ctx.fillStyle = color;
   ctx.fill();
-
-  if (shape === 'side') {
-    // わけめ: cut a real parting in the hair, so the two halves read as combed
-    // apart rather than as one smooth sweep.
-    const partX = cx - halfSpan * 0.4;
-    const gw = Math.max(5, width * 0.02) * (0.6 + size);
-    ctx.save();
-    ctx.globalCompositeOperation = 'destination-out';
-    ctx.beginPath();
-    ctx.moveTo(partX - gw * 0.16, top);
-    ctx.lineTo(partX + gw * 0.16, top);
-    ctx.lineTo(partX + gw * 0.7, boundary(partX) + 4);
-    ctx.lineTo(partX - gw * 0.7, boundary(partX) + 4);
-    ctx.closePath();
-    ctx.fill();
-    ctx.restore();
-  }
   ctx.restore();
 }
 
@@ -928,8 +912,9 @@ function drawHeadCover(ctx, spec, limits) {
  */
 export function drawHeadCoverWrap(ctx, spec, layout) {
   const shape = spec?.shape ?? 'off';
-  // `split` and `wave` are retired front-plate shapes; they have no wrap equal.
-  if (shape === 'off' || shape === 'none' || shape === 'split' || shape === 'wave') return;
+  // `split`, `wave` and `side` are retired front-plate shapes; they have no wrap
+  // equal. An old saved state may still carry one, so it simply draws no hair.
+  if (shape === 'off' || shape === 'none' || shape === 'split' || shape === 'wave' || shape === 'side') return;
 
   const size = clamp(spec.size ?? 1, 0.02, 3);
   const W = layout.width;
@@ -962,30 +947,19 @@ export function drawHeadCoverWrap(ctx, spec, layout) {
     // centre (the peak) and at the temples, with the corners between receded -
     // the three peaks and two valleys of an "M". `t` is -1..1 across the front.
     if (shape === 'fringe') {
-      const m = (1 + Math.cos(2 * Math.PI * t)) / 2;   // wide peaks at t = 0, +-1
-      const peak = Math.max(0, 1 - Math.abs(t) * 1.6); // the central point
-      const shape01 = 0.55 * m + 0.45 * peak;          // 0..1 across the M
-      // The recessed corners keep a hairline, and the peaks scale with `size`, so
-      // a small まえがみ stays an M instead of collapsing into a spindle.
-      const valley = Math.max(base, 0.10);
-      // The peaks deepen with `size`, so a small まえがみ is a small M rather
-      // than a tall spike on a thin band.
-      const amp = 0.36 * (0.55 + 0.45 * Math.min(clamp(size, 0.05, 3), 1));
-      return valley + amp * shape01;
+      const dip = (x, centre, reach) => Math.max(0, 1 - Math.abs(x - centre) / reach);
+      // The centre dips the lowest, the two temples dip less, and the hairline
+      // recedes between them - the two valleys and three points of an "M".
+      const shape01 = Math.max(dip(t, 0, 0.36), 0.6 * Math.max(dip(t, -0.82, 0.26), dip(t, 0.82, 0.26)));
+      // The points grow with `size`, so a small まえがみ is a small M rather than
+      // a thin band with a tall spike (a spindle).
+      return base + 0.16 * size * shape01;
     }
     // はちわれ: the same V upside down - a widow's peak.
     if (shape === 'fringe-up') return base - 0.18 * Math.max(0, 1 - Math.abs(t) * 1.5);
     // カーブ: a deep round cover - low at the sides, high in the middle, like the
     // blue of a certain robot cat's head.
     if (shape === 'curve') return base + 0.42 * t * t;
-    // わけめ: a 7:3 part. The hairline is asymmetric across the *front* only and
-    // comes back to the base level at the sides, so it is continuous at the back
-    // seam (an angle-varying hairline there would ride the seam and step). The
-    // parting line is the gap cut out below.
-    if (shape === 'side') {
-      const w = Math.max(0, 1 - t * t);   // 0 at the sides, 1 at the front
-      return base + 0.18 * w * (0.5 + 0.5 * t);
-    }
     return base - 0.07 * (1 - t * t);  // `cap`
   };
 
@@ -1000,26 +974,6 @@ export function drawHeadCoverWrap(ctx, spec, layout) {
   ctx.closePath();
   ctx.fillStyle = color;
   ctx.fill();
-
-  if (shape === 'side') {
-    // The parting: a shallow notch cut up from the hairline at 30% (a 7:3 split).
-    // Cutting all the way to the top of the head made it look bald, so only the
-    // lower part of the covering is cut.
-    const partX = span * 0.4;
-    const gw = Math.max(6, span * 0.012) * (0.6 + size);
-    const bY = clamp(vBound(partX), 0, 1) * H;
-    const top = Math.max(0, bY - Math.min(110, bY * 0.6));
-    ctx.save();
-    ctx.globalCompositeOperation = 'destination-out';
-    ctx.beginPath();
-    ctx.moveTo(partX - gw * 0.35, top);
-    ctx.lineTo(partX + gw * 0.35, top);
-    ctx.lineTo(partX + gw * 1.1, bY + 2);
-    ctx.lineTo(partX - gw * 1.1, bY + 2);
-    ctx.closePath();
-    ctx.fill();
-    ctx.restore();
-  }
   ctx.restore();
 }
 
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