设置对齐标注的倾角为相对UCS X轴的绝对转角

LoveArx

Set oblique angle of aligned dimensions to a certain angle relative to an axis in the current UCS

Consider this: You want to set the oblique angle of an aligned dimension to an arbitrary value (for example, 30 degrees from the X-axis of the current UCS to one of the extension line within which the dimension is constructed).

To do this, you need to realize that that the Oblique angles are calculated relative to the line containing the two start points of the two extension lines of the dimension. Let's call this the base line of aligned dimensions. With this in mind, if the angle from the baseline to X axis is angBaselineToX, and the oblique angle relative to X axis will be angRelOblique, then (- angBaselineToX + angRelOblique) should be sent to AcDbAlignedDimension::oblique() as the input parameter. The following code does this:

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;
   
9. 
   
10. AcDbDatabase *pDb =
    
11.   acdbHostApplicationServices()->workingDatabase();
    
12. 
    
13. // get start and end points
    
14. if(acedGetPoint(NULL, L"\nFirst point: ",
    
15.   asDblArray(pt1))!= RTNORM)
    
16.   return;
    
17. 
    
18. if( acedGetPoint(asDblArray(pt1), L"\nSecond point: ",
    
19.   asDblArray(pt2) ) != RTNORM)
    
20.   return;
    
21. 
    
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;
    
28. 
    
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);
    
32. 
    
33. if( ret == RTNONE ) oblAng = 0.0;
    
34. else if ( ret != RTNORM ) return;
    
35. 
    
36. // calculate the dimension baseline angle
    
37. baseAng = acutAngle(asDblArray(pt1), asDblArray(pt2));
    
38. 
    
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);
    
43. 
    
44. // get transform matrix
    
45. if( !acdbUcsMatrix(m, pDb) ) return;
    
46. 
    
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);
    
51. 
    
52. // set default database and transform it to WCS
    
53. pDim->setDatabaseDefaults();
    
54. es = pDim->transformBy(m); assert(es==Acad::eOk);
    
55. 
    
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();
    
67. 
    
68. return;
    
69. }
    

void setDimTxtOblique()<br /> {<br /> AcGePoint3d pt1, pt2;<br /> double baseAng, oblAng;<br /> AcGePoint3d ptDim;<br /> AcGeMatrix3d m;<br /> Acad::ErrorStatus es;<br /> int ret;<br /> <br /> AcDbDatabase *pDb =<br />   acdbHostApplicationServices()->workingDatabase();<br /> <br /> // get start and end points<br /> if(acedGetPoint(NULL, L"\nFirst point: ",<br />   asDblArray(pt1))!= RTNORM)<br />   return;<br /> <br /> if( acedGetPoint(asDblArray(pt1), L"\nSecond point: ",<br />   asDblArray(pt2) ) != RTNORM)<br />   return;<br /> <br /> // get text position<br /> AcGePoint3d ptMid( 0.5*(pt1.x + pt2.x), 0.5*(pt1.y + pt2.y),<br />   0.5*(pt1.z + pt2.z));<br /> if(acedGetPoint(asDblArray(ptMid), L"\nDim Line position:",<br />   asDblArray(ptDim) ) != RTNORM)<br />   return;<br /> <br /> // get the oblique angle from users<br /> // please note it's relative to the X axis of current UCS<br /> ret = acedGetAngle(NULL, L"Oblique angle: <0.0>", &oblAng);<br /> <br /> if( ret == RTNONE ) oblAng = 0.0;<br /> else if ( ret != RTNORM ) return;<br /> <br /> // calculate the dimension baseline angle<br /> baseAng = acutAngle(asDblArray(pt1), asDblArray(pt2));<br /> <br /> // create aligned dimension<br /> AcDbAlignedDimension* pDim = new AcDbAlignedDimension;<br /> es = pDim->setXLine1Point(pt1); assert(es==Acad::eOk);<br /> es = pDim->setXLine2Point(pt2); assert(es==Acad::eOk);<br /> <br /> // get transform matrix<br /> if( !acdbUcsMatrix(m, pDb) ) return;<br /> <br /> // set line points and text position as default<br /> es=pDim->setDimLinePoint(ptDim); assert(es==Acad::eOk);<br /> es=pDim->useDefaultTextPosition(); assert(es==Acad::eOk);<br /> es=pDim->setOblique(oblAng-baseAng); assert(es==Acad::eOk);<br /> <br /> // set default database and transform it to WCS<br /> pDim->setDatabaseDefaults();<br /> es = pDim->transformBy(m); assert(es==Acad::eOk);<br /> <br /> // append it to AutoCAD database<br /> AcDbBlockTableRecord *pBlkRec;<br /> AcDbObjectId objID;<br /> es = acdbOpenObject(pBlkRec, pDb->currentSpaceId(),<br />   AcDb::kForWrite);<br /> assert(es==Acad::eOk);<br /> es =pBlkRec->appendAcDbEntity (objID, pDim) ;<br /> assert(es==Acad::eOk);<br /> // close it<br /> pDim->close();<br /> pBlkRec->close();<br /> <br /> return;<br /> }<br />