如何用ARX实现直线的offset偏移功能？

highflybird

1. //选择物体
   
2. int ret;
   
3. ads_point pt,pt1,pt2;
   
4. ads_name ename;
   
5. ret = acedEntSel(_T("\n请选择曲线类物体："),ename,pt);
   
6. if (RTNORM != ret)
   
7. {
   
8. acutPrintf(_T("\n选择无效，程序返回。"));
   
9. return;
   
10. }
    
11. //判断是否曲线类物体
    
12. Acad:;ErrorStatus es;
    
13. AcDbEntity *pEnt = NULL;
    
14. AcDbObjectId id;
    
15. es = acdbGetObjectId(id,ename);
    
16. es = acdbOpenAcDbEntity(pEnt,id,AcDb::kForRead);
    
17. if (es != Acad::eOk)
    
18. {
    
19. return;
    
20. }
    
21. if (!pEnt->isKindOf(AcDbCurve::desc()))
    
22. {
    
23. pEnt->close();
    
24. acutPrintf(_T("\n选择物体不是曲线，程序返回。"));
    
25. return ;
    
26. }
    
27. //输入偏移方向
    
28. double offDist;
    
29. ret = acedGetPoint(NULL,_T("\n点取偏移方向："),pt1);
    
30. if (RTNORM != ret)
    
31. {
    
32. acutPrintf(_T("\n点取无效，程序返回。"));
    
33. return;
    
34. }
    
35. //输入偏移距离
    
36. ret = acedGetDist(pt1,_T("\n偏移距离："),&offDist);
    
37. if (RTNORM != ret)
    
38. {
    
39. acutPrintf(_T("\n输入距离无效，程序返回。"));
    
40. return;
    
41. }
    
42. //此段用语判断偏移的方向
    
43. AcDbCurve * pCurve = (AcDbCurve *)(pEnt);
    
44. AcDbVoidPtrArray  Curves;
    
45. AcGePoint3d pt3d1 = asPnt3d(pt1);
    
46. AcGePoint3d pt3d2,pt3d3;
    
47. AcGeVector3d vec,vec1;
    
48. AcGeVector3d nrm;
    
49. es = pCurve->getClosestPointTo(pt3d1,pt3d2);
    
50. es = pCurve->getFirstDeriv(pt3d2,vec);
    
51. pt3d3 = pt3d2 + vec;
    
52. vec1 = pt3d1 -pt3d2;
    
53. double area = vec.y * vec1.x - vec.x * vec1.y ;
    
54. //如果是直线或者射线之类的物体，偏移距离需要反号
    
55. if (pCurve->isKindOf(AcDbLine::desc()) || pCurve->isKindOf(AcDbXline::desc()) || pCurve->isKindOf(AcDbRay::desc()))
    
56. {
    
57. offDist = - offDist;
    
58. }
    
59. //如果是顺时针旋转，则偏移距离需要反号
    
60. if (area > 0)
    
61. {
    
62. es = pCurve->getOffsetCurves(offDist,Curves);
    
63. }
    
64. else
    
65. {
    
66. es = pCurve->getOffsetCurves(-offDist,Curves);
    
67. }
    
68. pCurve->close();
    
69. //现在已经得到偏移的曲线集了，剩下的的工作是添加到空间中去。
    
70. pEnt = NULL;
    
71. AcDbBlockTable *pBlockTable;
    
72. acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlockTable, AcDb::kForRead);
    
73. AcDbBlockTableRecord *brec;
    
74. resbuf tilemode;
    
75. acedGetVar(_T("TILEMODE"),&tilemode);
    
76. int tile = tilemode.resval.rint;
    
77. if (tile == 1)
    
78. pBlockTable->getAt(ACDB_MODEL_SPACE, brec,AcDb::kForWrite);
    
79. else
    
80. pBlockTable->getAt(ACDB_PAPER_SPACE, brec,AcDb::kForWrite);
    
81. pBlockTable->close();
    
82. AcDbObjectId entid;
    
83. for (int i = 0;i< Curves.length();i++)
    
84. {
    
85.    pEnt =(AcDbEntity *) Curves[ i ] ;  
    
86.    brec->appendAcDbEntity(entid, pEnt);
    
87.    pEnt->close();
    
88. }
    
89. brec->close();
    
90. acutPrintf(_T("\n偏移成功！"));
    

//选择物体<br /> int ret;<br /> ads_point pt,pt1,pt2;<br /> ads_name ename;<br /> ret = acedEntSel(_T("\n请选择曲线类物体："),ename,pt);<br /> if (RTNORM != ret)<br /> {<br /> acutPrintf(_T("\n选择无效，程序返回。"));<br /> return;<br /> }<br /> //判断是否曲线类物体<br /> Acad:;ErrorStatus es;<br /> AcDbEntity *pEnt = NULL;<br /> AcDbObjectId id;<br /> es = acdbGetObjectId(id,ename);<br /> es = acdbOpenAcDbEntity(pEnt,id,AcDb::kForRead);<br /> if (es != Acad::eOk)<br /> {<br /> return;<br /> }<br /> if (!pEnt->isKindOf(AcDbCurve::desc()))<br /> {<br /> pEnt->close();<br /> acutPrintf(_T("\n选择物体不是曲线，程序返回。"));<br /> return ;<br /> }<br /> //输入偏移方向<br /> double offDist;<br /> ret = acedGetPoint(NULL,_T("\n点取偏移方向："),pt1);<br /> if (RTNORM != ret)<br /> {<br /> acutPrintf(_T("\n点取无效，程序返回。"));<br /> return;<br /> }<br /> //输入偏移距离<br /> ret = acedGetDist(pt1,_T("\n偏移距离："),&offDist);<br /> if (RTNORM != ret)<br /> {<br /> acutPrintf(_T("\n输入距离无效，程序返回。"));<br /> return;<br /> }<br /> //此段用语判断偏移的方向<br /> AcDbCurve * pCurve = (AcDbCurve *)(pEnt);<br /> AcDbVoidPtrArray  Curves;<br /> AcGePoint3d pt3d1 = asPnt3d(pt1);<br /> AcGePoint3d pt3d2,pt3d3;<br /> AcGeVector3d vec,vec1;<br /> AcGeVector3d nrm;<br /> es = pCurve->getClosestPointTo(pt3d1,pt3d2);<br /> es = pCurve->getFirstDeriv(pt3d2,vec);<br /> pt3d3 = pt3d2 + vec;<br /> vec1 = pt3d1 -pt3d2;<br /> double area = vec.y * vec1.x - vec.x * vec1.y ;<br /> //如果是直线或者射线之类的物体，偏移距离需要反号<br /> if (pCurve->isKindOf(AcDbLine::desc()) || pCurve->isKindOf(AcDbXline::desc()) || pCurve->isKindOf(AcDbRay::desc()))<br /> {<br /> offDist = - offDist;<br /> }<br /> //如果是顺时针旋转，则偏移距离需要反号<br /> if (area > 0)<br /> {<br /> es = pCurve->getOffsetCurves(offDist,Curves);<br /> }<br /> else<br /> {<br /> es = pCurve->getOffsetCurves(-offDist,Curves);<br /> }<br /> pCurve->close();<br /> //现在已经得到偏移的曲线集了，剩下的的工作是添加到空间中去。<br /> pEnt = NULL;<br /> AcDbBlockTable *pBlockTable;<br /> acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlockTable, AcDb::kForRead);<br /> AcDbBlockTableRecord *brec;<br /> resbuf tilemode;<br /> acedGetVar(_T("TILEMODE"),&tilemode);<br /> int tile = tilemode.resval.rint;<br /> if (tile == 1) <br /> pBlockTable->getAt(ACDB_MODEL_SPACE, brec,AcDb::kForWrite);<br /> else<br /> pBlockTable->getAt(ACDB_PAPER_SPACE, brec,AcDb::kForWrite);<br /> pBlockTable->close();<br /> AcDbObjectId entid;<br /> for (int i = 0;i< Curves.length();i++)<br /> {<br />    pEnt =(AcDbEntity *) Curves[ i ] ;  <br />    brec->appendAcDbEntity(entid, pEnt);<br />    pEnt->close();<br /> }<br /> brec->close();<br /> acutPrintf(_T("\n偏移成功！"));<br />

c735023723

highflybir 发表于 2011-12-20 23:07
已知一个点pt ,和曲线curve,获得pt在曲线的getclosestpointto（最近点），获得此处的firstDeriv，由此得到 ...

谢谢，明白了