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：
! Y3 S3 U8 q# b- `& `1.通过参考平面创建
% C& V& ?. I& Z" U/ l//获得参考平面
" {& q2 }* Y# X6 r* aCATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
//在XY plane 上创建草图
" `7 k! U; Z6 ~" a) M; ^0 q7 e! I5 }5 ^! gCATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
% H" [9 ]5 v( y6 U2.通过原点和两个矢量方向
# e6 Y( `, |+ z% Z! ^5 W: R1 a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：
0 Y& M9 U* s( _3 H- |4 Udouble pOrigin[3]={0,0,10};
6 u* J/ O$ r) `" D; idouble pH[3]={1,0,0};
4 w; a5 Q( A9 I' hdouble pV[3]={0,1,0};
CATISketchFactory_var spSketchFactory(spContainer);
9 H) R. }9 z0 q$ A+ Y. FCATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);

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2 {0 I1 ^. e/ q3 b; L6 X3 V5 Xsp2DFactory(spSketch);
//下面创建点
CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
6 V- R) Z! ~) \8 ydouble pt_bottom_left[2] = {10, 10};
- E9 D0 M6 s& C+ B+ m: s3 w, Q+ t& J( Zdouble pt_bottom_right[2] = {50, 10};
6 Z  C+ ^- c3 V) M# Q: j, u& Tdouble pt_top_right[2] = {50, 50};
double pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
+ z2 s9 W8 ^& `2 u0 d4 r2 o//开始创建线
4 U2 T# l2 c3 p) h' _CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
5 {2 X7 u: s4 ]6 [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

% ?2 }& W* X$ {CATI2DCurve_var spCurve1 (spLine1);
& y" Q- B/ P. n) mCATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
$ \7 J7 e  O" p$ G. E5 JspCurve3->SetEndPoint(spPt_top_left);
; l/ o- e% ]  e. T: N# Z+ QspCurve4->SetStartPoint(spPt_top_left);
$ i. f5 U2 \/ T% D* aspCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
* G& u$ }% x9 N3 C3 p0 N# qspSketch->CloseEdition();


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创建草图约束
8 O) l! z$ i7 ?* d$ P/ \! q4 `CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
( m4 r* f+ G3 f' }+ u4 D//定义spLine1 为水平约束
, D- h/ a  i: kspConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
) O0 M1 t5 ~! Z& T% S* w9 jNULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
" s3 h) {) K* p4 X1 ?$ p/ N* fspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
9 J, B8 Z6 s) D! R2 m8 N- bNULL, Cst2DType_Vertical, 0, 0 );
//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
$ ~2 Q* u5 F$ F* {/ d8 B) H$ I//定义spLine4 为垂直约束
/ s+ g# B1 l, N/ |4 |( MspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
//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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; K& B2 k! _; M2 z+ y//定义spLine2 与spLine4 的距离约束
  v9 F1 Q9 }: J0 |spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
- W6 Y  Q! Z4 m2 |: B" vNULL, Cst2DType_Distance, 0, 0 );
2 p- T9 q# W) S9 g& k: B//定义spPt_bottom_left 与X 轴的距离约束
CATI2DAxis_var spSupport = NULL_var;
spSketch->GetAbsolute2DAxis(spSupport);
# L# [+ P8 p$ T+ Q, ZspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
" G* F  i3 U: Y7 c3 M! m* {! e//定义spPt_bottom_left 与Y 轴的距离约束
6 F- `, I- N' w- P$ ispConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
+ B) \0 K; n# [9 R! S6 {" g1 k# KspSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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