【ARX 一步一步开发CAD】03-画线

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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)
  N8 B  l$ Z, x0 ~+ H' g{
AcDbLine * pLine = new AcDbLine( ptStart , ptEnd );
// 获得指向块表的指针
2 c. D, j+ G( o# M3 `* ?' \AcDbBlockTable *pBlockTable; acdbHostApplicationServices()->workingDatabase()
->getBlockTable(pBlockTable, AcDb::kForRead);
# ]4 F' D5 e% n- {9 P  H  C// 获得指向特定的块表记录（模型空间）的指针
3 m( o  V2 ]! Z' Y2 qAcDbBlockTableRecord *pBlockTableRecord;
, ?" F+ t$ C- [5 {pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
- w7 [- N. u5 p  U+ o6 Y: g' Y// 将AcDbLine类的对象添加到块表记录中
AcDbObjectId lineId;
2 u4 i/ Z9 X1 y# ]4 |8 |) wpBlockTableRecord->appendAcDbEntity(lineId, pLine);
// 关闭图形数据库的各种对象
1 d0 F4 x& \8 DpBlockTable->close();
pBlockTableRecord->close();
8 l0 D$ l! g. G" f( HpLine->close();
5 N! D- v4 Z4 R0 `8 k( l7 F+ d}
多线段：
, s8 h3 j4 g# e# b5 c1 E) x3 nvoid CreatePolyline(AcGePoint2dArray points ,double width)
6 P2 |, i! M! J5 D! H# A1 i{
- d. u3 @: a4 Y) V$ v) K$ U4 A9 gint numVertices = points.length();
. x8 |; E) Y  R7 h& bAcDbPolyline *pPoly = new AcDbPolyline(numVertices);
" T$ I4 f1 K2 {! f6 m- c/ g2 L2 nfor (int i = 0; i < numVertices; i++)
{
pPoly->addVertexAt(i, points.at(i), 0, width, width);
- r7 Q! z5 U+ D) x}
AcDbObjectId polyId;
7 r# _* a2 h; h1 ^, }+ A2 ^polyId = PostToModelSpace(pPoly);
//        return polyId;
}
static AcDbObjectId PostToModelSpace(AcDbEntity* pEnt)
{
9 ~4 S" N8 ]( `3 xAcDbBlockTable *pBlockTable;
- Q) S8 @& I/ I7 {3 j6 L# yacdbHostApplicationServices()->workingDatabase() ->getBlockTable(pBlockTable, AcDb::kForRead);
AcDbBlockTableRecord *pBlockTableRecord;
1 R' {1 K' E2 d+ E3 e3 upBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
+ Y4 j1 ^7 K& t& lAcDbObjectId entId;
pBlockTableRecord->appendAcDbEntity(entId, pEnt);
" V  S" |# o! }+ ]  k9 xpBlockTable->close();
pBlockTableRecord->close();
pEnt->close();
return entId;

}
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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