[每日一码] 设置对齐标注的倾角为相对UCS X轴的绝对转角

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1. void setDimTxtOblique()
2. {
3. AcGePoint3d pt1, pt2;
4. double baseAng, oblAng;
5. AcGePoint3d ptDim;
6. AcGeMatrix3d m;
7. Acad::ErrorStatus es;
8. int ret;
10. AcDbDatabase *pDb =
11.   acdbHostApplicationServices()->workingDatabase();
13. // get start and end points
14. if(acedGetPoint(NULL, L"\nFirst point: ",
15.   asDblArray(pt1))!= RTNORM)
16.   return;
18. if( acedGetPoint(asDblArray(pt1), L"\nSecond point: ",
19.   asDblArray(pt2) ) != RTNORM)
20.   return;
22. // get text position
23. AcGePoint3d ptMid( 0.5*(pt1.x + pt2.x), 0.5*(pt1.y + pt2.y),
24.   0.5*(pt1.z + pt2.z));
25. if(acedGetPoint(asDblArray(ptMid), L"\nDim Line position:",
26.   asDblArray(ptDim) ) != RTNORM)
27.   return;
29. // get the oblique angle from users
30. // please note it's relative to the X axis of current UCS
31. ret = acedGetAngle(NULL, L"Oblique angle: <0.0>", &oblAng);
33. if( ret == RTNONE ) oblAng = 0.0;
34. else if ( ret != RTNORM ) return;
36. // calculate the dimension baseline angle
37. baseAng = acutAngle(asDblArray(pt1), asDblArray(pt2));
39. // create aligned dimension
40. AcDbAlignedDimension* pDim = new AcDbAlignedDimension;
41. es = pDim->setXLine1Point(pt1); assert(es==Acad::eOk);
42. es = pDim->setXLine2Point(pt2); assert(es==Acad::eOk);
44. // get transform matrix
45. if( !acdbUcsMatrix(m, pDb) ) return;
47. // set line points and text position as default
48. es=pDim->setDimLinePoint(ptDim); assert(es==Acad::eOk);
49. es=pDim->useDefaultTextPosition(); assert(es==Acad::eOk);
50. es=pDim->setOblique(oblAng-baseAng); assert(es==Acad::eOk);
52. // set default database and transform it to WCS
53. pDim->setDatabaseDefaults();
54. es = pDim->transformBy(m); assert(es==Acad::eOk);
56. // append it to AutoCAD database
57. AcDbBlockTableRecord *pBlkRec;
58. AcDbObjectId objID;
59. es = acdbOpenObject(pBlkRec, pDb->currentSpaceId(),
60.   AcDb::kForWrite);
61. assert(es==Acad::eOk);
62. es =pBlkRec->appendAcDbEntity (objID, pDim) ;
63. assert(es==Acad::eOk);
64. // close it
65. pDim->close();
66. pBlkRec->close();
68. return;
69. }

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