[每日一码] 模拟命令UCS+V的ARX实现代码

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1. Acad::ErrorStatus UCS采用V()
2. {
3.    AcGeMatrix3d matUcs;
4.    struct resbuf rbZeroPt;
5.    acedGetVar(采用T("UCSORG"), &rbZeroPt); // origin point for current UCS (in WCS, so, we don't need to convert it)
6.    struct resbuf viewTwist;
7.    acedGetVar(采用T("VIEWTWIST"), &viewTwist); // view rotation angle      
8.    struct resbuf rbViewDir;
9.    acedGetVar(采用T("VIEWDIR"), &rbViewDir); // Z vector
10.    AcGeVector3d zAxis = asPnt3d(rbViewDir.resval.rpoint).asVector();
11.    acdbUcs2Wcs(asDblArray(zAxis),asDblArray(zAxis),true); // to WCS convertation
12.    zAxis *=  (1.0 / zAxis.length()); // normalization
13.    matUcs = AcGeMatrix3d::planeToWorld(zAxis) * AcGeMatrix3d::rotation(-viewTwist.resval.rreal, AcGeVector3d::kZAxis, AcGePoint3d::kOrigin); // "by view" matrix. origin is (0,0,0)
14.    matUcs.setTranslation(asPnt3d(rbZeroPt.resval.rpoint).asVector()); // set the correct origin
15.    return acedSetCurrentUCS(matUcs);
16. }

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