Catia二次开发源码分享：创建草图 Sketch，约束，曲线等

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有两种方式可以创建草图：
, e1 N- i! E! S* `" p9 [* {9 n! |, q( p1.通过参考平面创建
4 L' p, z4 p  ?2 s//获得参考平面
CATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
6 l: o- I% f0 e: _' d" D* {: [* i7 b//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
" P2 B0 L9 B+ ?//在XY plane 上创建草图
CATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
2.通过原点和两个矢量方向
) U  _$ d4 G! `3 J该方法通过定义一个原点和两个方向 pH、pV 进行创建。
定义原点和方向：
double pOrigin[3]={0,0,10};
double pH[3]={1,0,0};
: P( ?% b) j6 edouble pV[3]={0,1,0};
( j: I/ ~* H1 y0 [CATISketchFactory_var spSketchFactory(spContainer);
& x! v7 ]' S& J1 q, m8 qCATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);


sp2DFactory(spSketch);
# |5 S5 Q: E. `2 Q' {. D6 ^//下面创建点
CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
( r, ]0 t9 ?/ o" r; P" Vdouble pt_bottom_left[2] = {10, 10};
+ F7 G$ }4 ^9 udouble pt_bottom_right[2] = {50, 10};
double pt_top_right[2] = {50, 50};
double pt_top_left[2] = {10, 50};
* b+ x0 p7 P' d5 I* cspPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
. u: F! H& Q4 TspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
* I% Z5 c1 p1 A% M; W9 dspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
! n2 n5 n1 ~1 _# v, N- ?spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
' R$ S& D9 B. e! M( |; J//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
spLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
//将线的首尾连接起来

CATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
) J. t+ D7 V) z  L: K/ `: tCATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
: n: c7 Y& F' K4 e7 G. r2 L6 f9 aspCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
5 w0 w! O6 S5 J0 kspCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
1 x# l/ u) V, V* z7 `1 R: ZspCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
4 v4 r& }) B- o( t' j. _3 _" f//然后退出草图：
7 U) C. ~* Q8 M  Q7 V& JspSketch->CloseEdition();
8 M$ d1 Q$ p4 e. R! ^$ i


创建草图约束
CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
' o* p# j/ B  l' Z& Z//定义spLine1 为水平约束
* O) o1 \6 a- @, |spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
: j, T' G* a1 z, U4 S' qNULL, Cst2DType_Vertical, 0, 0 );
, p4 _, W0 C; Y) p: ]. ^# M//定义spLine3 为水平约束
( t$ N$ W/ F( lspConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
4 X$ v% U( h9 o( p3 GNULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
+ s5 u' g, L% a- s9 B& S% uNULL, Cst2DType_Vertical, 0, 0 );
% E; p( q' Q1 @' q, [2 m//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Length, 0, 0 );
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//定义spLine2 与spLine4 的距离约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
NULL, Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与X 轴的距离约束
* R8 z- t9 F$ H$ wCATI2DAxis_var spSupport = NULL_var;
/ K& j7 g2 V& Y, V" {spSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
; r5 O* r4 w( ^4 h6 o( zspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
7 d! o* S, M5 ?6 }; ^0 |4 M" V//定义spPt_bottom_left 与Y 轴的距离约束
! v3 P* S$ z$ x5 w' SspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
( X3 K( H; w0 K2 p7 p, ]spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );


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