Merge pull request '优化 transfromRegion：旋转与平移合成一次 region 变换（E3）' (#69) from home-lenovo-legion-r9000/fix-gidraw-transfromregion-e3 into main

Reviewed-on: #69
Reviewed-by: gjm <littleoldpan@163.com>

SourceCode/Code2026/AecRxBase/GiDrawUtility.cpp

@@ -223,27 +223,20 @@ AECDLLIMPEXP void GiDrawUtility::transfromRegion(AcDbRegion *pRegion
 {
 	AcGePlane plan;
 	plan.set(ptOnPlan, vtNormal);
-	AcGePoint3d pt0, pt1, pt2;
-	plan.get(pt0, pt1, pt2);
 
 	AcGeMatrix3d xform;
 	xform.setToPlaneToWorld(plan);
 
-	// 把region转到此面上
-	pRegion->transformBy(xform);
-
-	// 把 region 上的点也转到面上
+	// 先把 region 上的点转到面上，求出还需要平移多少
 	AcGePoint3d pt(ptOnRegion);
 	pt.transformBy(xform);
 
-	// 再把region在面上平移
-	AcGeVector3d vtm = ptOnPlan - pt;
-	if (!vtm.isZeroLength())
-	{
-		xform.setToIdentity();
-		xform.setToTranslation(ptOnPlan - pt);
-		pRegion->transformBy(xform);
-	}
+	// 旋转与平移合成一个矩阵，region 只做一次 ACIS 变换
+	AcGeMatrix3d matMove;
+	matMove.setToTranslation(ptOnPlan - pt);
+	xform.preMultBy(matMove);
+
+	pRegion->transformBy(xform);
 }
 
 AECDLLIMPEXP AcGeMatrix3d GiDrawUtility::RotateAndMove(const AcGeVector3d &vtOrig