请问intersectWith函数怎么用?能给个例子吗?谢谢

sterver

yfy2003

参考:

1. void chkints()
2. {
3.   ads_point pickPt;
4.   ads_name ent;  AcDbObjectId entId1, entId2;
5.   AcDbEntity *pEnt1, *pEnt2;
6.   AcGePoint3dArray intPoints;  // This array holds the intersecting points
7.   AcGePoint3d intPt;
8.   AcGePoint3d r1, r2, r3, r4;
9.   AcGeVector3d transVec(-0.1, 0.1, 0.0);  // Point translation vector
10.   AcGeMatrix3d transMat;          // Translation matrix
11.   char kw[10];
12.   int extVal = 0; // Extend value, 0 = no, 1 = fist entitity,
13.           // 2 = second entity, 3 = both entities
14.           // see intersectWith() function below  int rc;  rc = acedEntSel("\nSelect first entity to test for intersection: ",
15.           ent, pickPt);
16.   switch(rc)
17.   {
18.     case RTCAN:
19.       acutPrintf("\nUser canceled.");
20.       return;
21.     break;    case RTERROR:
22.       acutPrintf("\nNothing selected.");
23.       return;
24.     break;
25.   }// switch  acdbGetObjectId(entId1, ent);  // Is the entity a line, arc or circle?
26.   // Here we limit ourselves to lines, arcs
27.   // and circles, because that is what we created
28.   // in the last application.
29.   acdbOpenAcDbEntity(pEnt1, entId1, AcDb::kForRead);
30.   if(!(pEnt1->isKindOf(AcDbLine::desc())     ||
31.      pEnt1->isKindOf(AcDbCircle::desc()) ||
32.      pEnt1->isKindOf(AcDbArc::desc())
33.     )
34.      )
35.   {
36.     acutPrintf("\nNot a line, arc or circle entity.");
37.     pEnt1->close();
38.     return;
39.   }  // Now get the second entity
40.   rc = acedEntSel("\nSelect second entity to test for intersection: ",
41.           ent, pickPt);
42.   switch(rc)
43.   {
44.     case RTCAN:
45.       acutPrintf("\nUser canceled.");
46.       return;
47.     break;    case RTERROR:
48.       acutPrintf("\nNothing selected.");
49.       return;
50.     break;
51.   }// switch  acdbGetObjectId(entId2, ent);
52.   acdbOpenAcDbEntity(pEnt2, entId2, AcDb::kForRead);  // Is the second entity the same as the first?
53.   if(entId1 == entId2)
54.   {
55.     acutPrintf("\nSame entity selected!");
56.     pEnt1->close();
57.     pEnt2->close();
58.     return;
59.   }  // Is the second entity a line, arc or circle?
60.   if(!(pEnt2->isKindOf(AcDbLine::desc())     ||
61.      pEnt2->isKindOf(AcDbCircle::desc()) ||
62.      pEnt2->isKindOf(AcDbArc::desc())
63.     )
64.      )
65.   {
66.     acutPrintf("\nNot a line, arc or circle entity.");
67.     pEnt1->close();
68.     pEnt2->close();
69.     return;
70.   }  // If the first entity is not a circle
71.   // ask if the user wants to extend the entity
72.   // for apparent intersection
73.   if(!pEnt1->isKindOf(AcDbCircle::desc()))
74.   {
75.     pEnt1->highlight();    acedInitGet(NULL, "Yes No");
76.     rc = acedGetKword("\nExtend the highlighted entity - [Yes/No]<No>: ", kw);    pEnt1->unhighlight();    switch(rc)
77.     {
78.       case RTCAN:
79.       case RTERROR:
80.         acutPrintf("\nError with acedGetKword(). ");
81.         pEnt1->close();
82.         pEnt2->close();
83.         return;
84.       break;      case RTNONE:
85.       break;      case RTNORM:
86.         if(strcmp(kw, "Yes") == 0)
87.         {
88.           extVal = 1;
89.         }
90.       break;
91.     }
92.   }  // If the second entity is not a circle
93.   // ask if the user wants to extend the entity
94.   // for apparent intersection
95.   if(!pEnt2->isKindOf(AcDbCircle::desc()))
96.   {
97.     pEnt2->highlight();    acedInitGet(NULL, "Yes No");
98.     rc = acedGetKword("\nExtend the highlighted entity - [Yes/No]<No>: ", kw);    pEnt2->unhighlight();    switch(rc)
99.     {
100.       case RTCAN:
101.       case RTERROR:
102.         acutPrintf("\nError with acedGetKword(). ");
103.         pEnt1->close();
104.         pEnt2->close();
105.         return;
106.       break;      case RTNONE:
107.       break;      case RTNORM:
108.         if(strcmp(kw, "Yes") == 0)
109.         {
110.           if(extVal == 1)
111.           {
112.             extVal = 3;  // Both
113.           }
114.           else
115.           {
116.             extVal = 2;  // Second only
117.           }
118.         }
119.       break;
120.     }
121.   }
122.   // Does the first selected entity
123.   // intersect with the second enity?
124.   switch(extVal)
125.   {
126.     case 0 :
127.       pEnt1->intersectWith(pEnt2, AcDb::kOnBothOperands, intPoints);
128.       // No extension on either entity
129.     break;    case 1 :
130.       pEnt1->intersectWith(pEnt2, AcDb::kExtendThis, intPoints);
131.       // Extend the first entity
132.     break;    case 2 :
133.       pEnt1->intersectWith(pEnt2, AcDb::kExtendArg, intPoints);
134.       // Extend the second entity
135.     break;    case 3 :
136.       pEnt1->intersectWith(pEnt2, AcDb::kExtendBoth, intPoints);
137.       // Extend both entities
138.     break;  }  pEnt1->close();
139.   pEnt2->close();  // Here is an example of the AcGePoint3dArray class
140.   // as well as a demonstration of how to use translation
141.   // matricies AcGeMatrix3d
142.   if(! intPoints.isEmpty())
143.   {
144.     for(int i = 0; i < intPoints.length(); i++)
145.     {
146.       intPt = intPoints.at(i);      transMat = AcGeMatrix3d(transVec);
147.       r1 = intPt;
148.       r1.transformBy(transMat);
149.       transVec.set(0.0, -0.2, 0.0);
150.       transMat = AcGeMatrix3d(transVec);
151.       r2 = r1;
152.       r2.transformBy(transMat);      acedGrDraw((double*)(&r1), (double*)(&r2), 3, 0);      transVec.set(0.2, 0.0, 0.0);
153.       transMat = AcGeMatrix3d(transVec);
154.       r3 = r2;
155.       r3.transformBy(transVec);      acedGrDraw((double*)(&r2), (double*)(&r3), 3, 0);      transVec.set(0.0, 0.2, 0.0);
156.       transMat = AcGeMatrix3d(transVec);
157.       r4 = r3;
158.       r4.transformBy(transVec);      acedGrDraw((double*)(&r3), (double*)(&r4), 3, 0);
159.       acedGrDraw((double*)(&r4), (double*)(&r1), 3, 0);      transVec.set(-0.1, 0.1, 0.0);      acutPrintf("\nIntersection point = (%.2lf %.2lf %.2lf)",
160.             intPt.x, intPt.y, intPt.z);
161.     }
162.   }
163. }

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一只鸟243aZ

yfy2003 发表于 2004-6-3 21:58
参考:

C++?怎么运行呢？只知道有VBA，里斯普可以直接用，麻烦回一声哈。