bluebey-studio: 髪型の「まえがみ」を「ぎざぎざ」にしてギザギザの生え際に

1 files changed, 10 insertions, 14 deletions

diff --git a/public/bluebey-studio/src/faceArt.js b/public/bluebey-studio/src/faceArt.js
index 71e7487..5e99be5 100644
--- a/public/bluebey-studio/src/faceArt.js
+++ b/public/bluebey-studio/src/faceArt.js
@@ -867,14 +867,12 @@ 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). 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.
+    // ぎざぎざ: a jagged, saw-toothed hairline. A triangle wave across the front
+    // gives the teeth, and `size` scales how far they reach down.
     if (shape === 'fringe') {
-      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;
+      const teeth = 8;
+      const saw = Math.abs((((t * teeth) % 2) + 2) % 2 - 1);   // 0..1 triangle
+      return base + 200 * size * saw;
     }
     // 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);
@@ -947,13 +945,11 @@ 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 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;
+      // ぎざぎざ: a jagged, saw-toothed hairline. A triangle wave across the front
+      // gives the teeth, and `size` scales how far they reach down.
+      const teeth = 8;
+      const saw = Math.abs((((t * teeth) % 2) + 2) % 2 - 1);   // 0..1 triangle
+      return base + 0.20 * size * saw;
     }
     // 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);