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：
1.通过参考平面创建
//获得参考平面
8 k) S! P% p6 }6 i5 BCATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
//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
4 C+ w  o7 j1 |3 i, `( u( n1 q该方法通过定义一个原点和两个方向 pH、pV 进行创建。
6 q. c/ Q5 {' L3 t6 N+ p" a2 i. r9 i  M定义原点和方向：
1 m- U' e0 \9 u! H8 U* x6 Tdouble pOrigin[3]={0,0,10};
double pH[3]={1,0,0};
double pV[3]={0,1,0};
CATISketchFactory_var spSketchFactory(spContainer);
* f$ n" B, c0 M1 U/ D6 N  L1 HCATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);


. [, {& ?' Y  j; z5 Y0 d6 {sp2DFactory(spSketch);
//下面创建点
CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
+ a* b% |8 q6 Adouble pt_bottom_left[2] = {10, 10};
1 S" E' b5 Q; |5 F/ jdouble pt_bottom_right[2] = {50, 10};
7 o# N; _+ d, z% k: z1 Idouble pt_top_right[2] = {50, 50};
9 u* C0 ]" \! y/ U. q6 @: S* tdouble pt_top_left[2] = {10, 50};
" \  m5 h1 I! m( B1 @' q/ J: WspPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
# r$ m4 p! d+ j( m: [( g% GspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
  }; o+ {' `1 UspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
! a7 d, U0 b' W' UspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
) c: I9 f1 W1 \' g& W2 PspLine1 = 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);
" ]6 r- k+ n" G1 I% E# TCATI2DCurve_var spCurve4 (spLine4);
2 H% ^! k$ {7 H( Y3 N# sspCurve1->SetStartPoint(spPt_bottom_left);
6 |; [" j1 p# r% y' t; d5 lspCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
5 W  Q9 ?' a5 KspCurve3->SetEndPoint(spPt_top_left);
# ^) c4 i. A9 t8 I1 p! W8 GspCurve4->SetStartPoint(spPt_top_left);
& q- N5 O8 @9 {spCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
spSketch->CloseEdition();
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创建草图约束
, Q8 G" p4 f. P! F+ k5 v0 m0 L% sCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
) s3 b( _. D* {spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
, O, L: F% ?1 g- |NULL, Cst2DType_Horizontal, 0, 0 );
. X2 F; E, i5 d0 ^3 \% V0 ~//定义spLine2 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
5 Y) P6 t! ]8 A4 j$ m5 Q3 PNULL, Cst2DType_Vertical, 0, 0 );
//定义spLine3 为水平约束
& z% J! K6 p. D( P' l' g; ^spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
5 f' O& i9 E( Q. A, [$ X. n) l: }NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
4 C3 x( p; U; z" A3 }9 GNULL, Cst2DType_Vertical, 0, 0 );
$ }, I/ a' t* V' a8 Y//定义spLine2 的长度约束
0 k/ c5 y  O& l8 dspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
7 @! E+ K- {% o. t% x8 F; o3 `NULL, Cst2DType_Length, 0, 0 );

$ `# s2 t- J( ^0 c//定义spLine2 与spLine4 的距离约束
" S1 w. k: d& r) z$ F* BspConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
7 B6 h: j# B. n, b' D' ^NULL, Cst2DType_Distance, 0, 0 );
6 R2 l$ ]1 n! @% X+ O//定义spPt_bottom_left 与X 轴的距离约束
CATI2DAxis_var spSupport = NULL_var;
. M2 n4 l$ ^: s/ C5 }3 aspSketch->GetAbsolute2DAxis(spSupport);
, R5 |  F5 h  z' X4 QspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与Y 轴的距离约束
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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