From 938edc02040d5375b74565ddd51322a5445d166d Mon Sep 17 00:00:00 2001
From: LittleGuo <littleoldpan@163.com>
Date: Sun, 25 Oct 2026 18:35:41 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=20RotateAndMove=20=E5=B9=B3?=
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平移量应为 ptDist - R*ptOrig，原实现写成 ptDist - ptOrig，
仅在 ptOrig 位于旋转轴上（含原点）时才成立。

DrawTydf 台体分支传入的 ptBottom 非原点，vtMove 倾斜时
实体整体偏移 |R*ptOrig - ptOrig|，本次一并修正。
---
 SourceCode/Code2026/AecRxBase/GiDrawUtility.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/SourceCode/Code2026/AecRxBase/GiDrawUtility.cpp b/SourceCode/Code2026/AecRxBase/GiDrawUtility.cpp
index 094b72c..dc97d48 100644
--- a/SourceCode/Code2026/AecRxBase/GiDrawUtility.cpp
+++ b/SourceCode/Code2026/AecRxBase/GiDrawUtility.cpp
@@ -183,7 +183,11 @@ AECDLLIMPEXP AcGeMatrix3d GiDrawUtility::RotateAndMove(const AcGeVector3d &vtOri
 	AcGeMatrix3d mat(AcGeMatrix3d::kIdentity);
 	//mat = _vtDist.rotateTo(_vtOrig);
 	mat = _vtOrig.rotateTo(_vtDist);
-	mat.setTranslation(ptDist - ptOrig);
+	// 平移量须为 ptDist - R*ptOrig：先求旋转后的 ptOrig 落点，再算差值。
+	// 原来写成 ptDist - ptOrig，仅在 ptOrig 位于旋转轴上（含原点）时才正确。
+	AcGePoint3d ptTmp(ptOrig);
+	ptTmp.transformBy(mat);
+	mat.setTranslation(ptDist - ptTmp);
 	return mat;
 }