【ARX 一步一步开发CAD】03-画线

colinzhoucn

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, C9 r; x& P; BAcDbBlockTable *pBlockTable; acdbHostApplicationServices()->workingDatabase()
->getBlockTable(pBlockTable, AcDb::kForRead);
// 获得指向特定的块表记录（模型空间）的指针
AcDbBlockTableRecord *pBlockTableRecord;
5 \1 c: M; A' I3 X, _1 LpBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
* l$ N  i0 M( _% b: T6 m// 将AcDbLine类的对象添加到块表记录中
& G) |0 r7 [5 B" GAcDbObjectId lineId;
pBlockTableRecord->appendAcDbEntity(lineId, pLine);
// 关闭图形数据库的各种对象
. V% A. [7 }  Y% EpBlockTable->close();
1 {8 f( X# q$ a0 @% D2 MpBlockTableRecord->close();
  y. S1 U* G3 L3 \. ?- LpLine->close();
5 ]7 i! D' Q! T& b) H6 F2 \; @}
2 N! |) w5 ?9 _! V6 D多线段：
7 I3 A4 U/ O% s6 }: E8 svoid CreatePolyline(AcGePoint2dArray points ,double width)
" @# @9 ?0 R1 Z% S9 m{
int numVertices = points.length();
# u. h! j8 c, g7 [. o/ D/ L, D  TAcDbPolyline *pPoly = new AcDbPolyline(numVertices);
: r  P! L1 P, x& x0 Wfor (int i = 0; i < numVertices; i++)
8 s% S' h5 e1 g{
5 l' Z+ h9 f# `pPoly->addVertexAt(i, points.at(i), 0, width, width);
}
* m! b  t- T) [+ Z  f; n8 O( YAcDbObjectId polyId;
polyId = PostToModelSpace(pPoly);
8 ]" t1 r0 Y# R3 L3 g5 t; l//        return polyId;
}
3 {2 K) }+ p3 c, e6 Jstatic AcDbObjectId PostToModelSpace(AcDbEntity* pEnt)
{
3 `" i6 {: ]+ y: X+ L. xAcDbBlockTable *pBlockTable;
acdbHostApplicationServices()->workingDatabase() ->getBlockTable(pBlockTable, AcDb::kForRead);
" p: `- i& S$ J! c9 O6 Z6 W9 RAcDbBlockTableRecord *pBlockTableRecord;
pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
3 D8 }3 \5 Y) a4 d) AAcDbObjectId entId;
pBlockTableRecord->appendAcDbEntity(entId, pEnt);
% K& i& r) A) M9 ]5 ~1 ypBlockTable->close();
3 V) g+ Q2 }9 R4 ^pBlockTableRecord->close();
6 u( {# j5 x7 i# j) }  o1 R; ypEnt->close();
: |& c* D9 l4 }0 V' wreturn entId;

}
* @6 r8 y! d0 _8 H1 j8 e. e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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