【ARX 一步一步开发CAD】03-画线

colinzhoucn

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这是比较简单的部分了，可以参考现有书籍。在网上下载两个画线的函数：

直线：

void LineCreate(AcGePoint3d ptStart,AcGePoint3d ptEnd)
{
AcDbLine * pLine = new AcDbLine( ptStart , ptEnd );
// 获得指向块表的指针
& C" k+ i. M& Z2 h3 iAcDbBlockTable *pBlockTable; acdbHostApplicationServices()->workingDatabase()
0 W7 R" [  M. I0 [! V9 Y->getBlockTable(pBlockTable, AcDb::kForRead);
// 获得指向特定的块表记录（模型空间）的指针
AcDbBlockTableRecord *pBlockTableRecord;
pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
! U- F% y& l" d3 \. A7 S// 将AcDbLine类的对象添加到块表记录中
AcDbObjectId lineId;
pBlockTableRecord->appendAcDbEntity(lineId, pLine);
; i4 H+ e4 I4 A3 @5 u3 M// 关闭图形数据库的各种对象
4 T7 s$ R# G2 VpBlockTable->close();
pBlockTableRecord->close();
+ X2 L: p: m1 u1 rpLine->close();
}
1 S, i0 p# J* k2 F# v2 @% r多线段：
void CreatePolyline(AcGePoint2dArray points ,double width)
6 J% l. }2 Q: T/ s9 ^# W{
int numVertices = points.length();
/ U% D, e& s% E; f& lAcDbPolyline *pPoly = new AcDbPolyline(numVertices);
+ {! Y( }% {" u! n/ o( vfor (int i = 0; i < numVertices; i++)
  B) N+ X' Z* M! N" r8 y+ Z{
pPoly->addVertexAt(i, points.at(i), 0, width, width);
}
AcDbObjectId polyId;
polyId = PostToModelSpace(pPoly);
3 M8 y( n5 P* R: s: T* p; W: h//        return polyId;
0 v$ P6 n* y9 J% }( {8 Q8 T}
1 I9 K: |4 L8 H3 {+ z7 j0 a; m8 q( c, @static AcDbObjectId PostToModelSpace(AcDbEntity* pEnt)
$ }  t: ^2 ]0 C* o# v9 P{
4 B  Q/ R8 s4 I: T  t6 P/ l9 \AcDbBlockTable *pBlockTable;
" x7 f6 T. @1 }9 p$ ^acdbHostApplicationServices()->workingDatabase() ->getBlockTable(pBlockTable, AcDb::kForRead);
4 v% K5 a2 c5 ]) e3 r- M' FAcDbBlockTableRecord *pBlockTableRecord;
/ z1 X1 ^! P/ m' @8 M- YpBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
$ x9 q0 J& |& O6 B6 y! z5 J2 HAcDbObjectId entId;
, F3 [. X% d/ B5 }+ b& u1 qpBlockTableRecord->appendAcDbEntity(entId, pEnt);
( h6 I* j5 ?% \- W) h; ?pBlockTable->close();
+ i* ~! }" X6 G5 g# n$ cpBlockTableRecord->close();
4 B$ v8 ~/ m2 o4 S: h: C9 jpEnt->close();
return entId;

}
, C# u+ L2 F1 G- |需要注意的是：创建线段与显示线段需要不同的代码。

参考：http://www.colinchou.com/archives/242

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