From 83ab2ae7605de432c8a94be6d90daa1dfa8902e2 Mon Sep 17 00:00:00 2001
From: Yasutake Yohei <61961825+yasutakeyohei@users.noreply.github.com>
Date: Thu, 22 Oct 2026 13:04:58 +0900
Subject: bluebey-studio: Shift+ドラッグで基準点を動かせるようにする
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通常ドラッグはぶるべーを移動（基準点は固定）、Shift+ドラッグはカメラの基準点を移動する。スマホの1本指／2本指の操作に合わせた。
---
 public/bluebey-studio/src/main.js | 38 ++++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

(limited to 'public/bluebey-studio/src')

diff --git a/public/bluebey-studio/src/main.js b/public/bluebey-studio/src/main.js
index e6bc785..ac8c04b 100644
--- a/public/bluebey-studio/src/main.js
+++ b/public/bluebey-studio/src/main.js
@@ -2321,9 +2321,10 @@ async function init() {
 
     // --- the mouse on the character ----------------------------------------
     // Dragging the model slides it across the view; holding Shift and dragging
-    // turns it around. Bone posing lives in the panel, so the mouse never grabs a
-    // bone (see `Rig` in src/rig.js). On a small screen the panel is a sheet over
-    // the view, so a tap on the view first just dismisses the sheet.
+    // moves the camera's reference point instead (the phone's two-finger drag).
+    // Bone posing lives in the panel, so the mouse never grabs a bone (see `Rig`
+    // in src/rig.js). On a small screen the panel is a sheet over the view, so a
+    // tap on the view first just dismisses the sheet.
     const dragRay = new THREE.Raycaster();
     const dragNdc = new THREE.Vector2();
     const dragHitAt = (event) => {
@@ -2355,14 +2356,12 @@ async function init() {
       }
       if (!dragHitAt(event)) return;
       const root = state.pose.root ?? [0, 0, 0];
-      const master = state.pose.bones?.master ?? [0, 0, 0];
       modelDrag = {
         pointerId: event.pointerId,
-        spin: event.shiftKey,
+        pan: event.shiftKey,
         x: event.clientX,
         y: event.clientY,
         root: [...root],
-        masterY: master[1] ?? 0,
       };
       view.controls.enabled = false;
       stage.style.cursor = 'grabbing';
@@ -2373,30 +2372,41 @@ async function init() {
       if (!modelDrag || event.pointerId !== modelDrag.pointerId) return;
       const dx = event.clientX - modelDrag.x;
       const dy = event.clientY - modelDrag.y;
-      if (modelDrag.spin) {
-        const bones = { ...(state.pose.bones ?? {}) };
-        const master = bones.master ?? [0, 0, 0];
-        bones.master = [master[0], round2(modelDrag.masterY + dx * 0.7), master[2]];
-        state.pose.bones = bones;
+      const k = dragScale();
+      if (modelDrag.pan) {
+        // Shift+drag: move the camera's reference point (the same effect as the
+        // two-finger drag on a phone). The character stays where it is.
+        const right = new THREE.Vector3(1, 0, 0).applyQuaternion(view.camera.quaternion);
+        const up = new THREE.Vector3(0, 1, 0).applyQuaternion(view.camera.quaternion);
+        const move = new THREE.Vector3()
+          .addScaledVector(right, -dx * k)
+          .addScaledVector(up, dy * k);
+        view.target.add(move);
+        for (const controls of Object.values(view.controlsMap ?? {})) controls.target.add(move);
+        for (const cam of Object.values(view.cameras ?? {})) cam.position.add(move);
+        view.captureInto(state.view);
       } else {
-        const k = dragScale();
+        // Plain drag: slide the character, leaving the camera's reference point
+        // alone (the one-finger drag on a phone).
         state.pose.root = [
           round2(modelDrag.root[0] + dx * k),
           round2(modelDrag.root[1] - dy * k),
           modelDrag.root[2],
         ];
+        app.panel?.onRigChanged?.();
       }
-      app.panel?.onRigChanged?.();
       app.needsRender = true;
     });
 
     const endModelDrag = (event) => {
       if (!modelDrag || (event && event.pointerId !== modelDrag.pointerId)) return;
+      const wasPan = modelDrag.pan === true;
       modelDrag = null;
       view.controls.enabled = true;
       stage.style.cursor = '';
       if (event) { try { canvas.releasePointerCapture(event.pointerId); } catch { /* ignore */ } }
-      capturePose();
+      if (wasPan) app.actions.syncPanel?.();
+      else capturePose();
       app.panel?.onRigChanged?.();
       app.needsRender = true;
     };
-- 
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