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：
  v3 l: R6 I( \. E1.通过参考平面创建
4 O0 e) l, I$ L/ ?" z7 K$ ?9 p9 L//获得参考平面
CATLISTV(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
- Q% l1 x8 F% t  m该方法通过定义一个原点和两个方向 pH、pV 进行创建。
9 Y1 e- _0 z6 X1 M! P4 l8 l3 ^; C定义原点和方向：
double pOrigin[3]={0,0,10};
double pH[3]={1,0,0};
double pV[3]={0,1,0};
CATISketchFactory_var spSketchFactory(spContainer);
- t* ]* N1 t  d1 DCATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);

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3 k, }0 ]: [% p( S2 N; D+ t; S7 csp2DFactory(spSketch);
//下面创建点
& l8 G  @) u7 a/ c( mCATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
double pt_bottom_left[2] = {10, 10};
9 a3 z$ t+ Z: i$ O5 R/ ~3 n0 p! Mdouble pt_bottom_right[2] = {50, 10};
  E  l' E8 [- h3 N/ ddouble pt_top_right[2] = {50, 50};
; W6 ^2 e- b: Jdouble pt_top_left[2] = {10, 50};
0 h0 v: d- E& |8 Q% j- F, u" cspPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
- r8 R" T$ l5 ~4 K1 I8 o% XspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
5 o7 s3 m2 i! I, |4 L/ JspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
4 n) ?2 i4 L  GspLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
5 M2 |+ Y* e5 D: T$ ]spLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
9 o3 m5 u1 ]6 A' `" AspLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
//将线的首尾连接起来
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CATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
# c3 S& x7 S! Y* c3 |8 }# eCATI2DCurve_var spCurve3 (spLine3);
. J3 U5 i7 H- y; ?CATI2DCurve_var spCurve4 (spLine4);
9 d: n3 `9 M, H) wspCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
# _5 v( j6 ^7 v( d: L; M; DspCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
) x- y9 V4 X  \9 y6 P$ MspCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
spSketch->CloseEdition();
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$ `8 p1 d6 ^6 I  u+ O7 }& }1 G创建草图约束
CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
3 B( U) l/ W$ M" U5 x. n//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
: k7 B3 b9 ?" ~8 r; `! ANULL, Cst2DType_Horizontal, 0, 0 );
2 c0 O6 ~2 Y: E( c3 w9 t; @" i: _//定义spLine2 为垂直约束
# e, n. U' F( JspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
! `) S9 J& j: L* A2 j3 K0 o; }  FNULL, Cst2DType_Vertical, 0, 0 );
& s" ~, e4 X. D! F9 o* R; c, `: ?//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
! x, ]: x7 }* }2 @NULL, Cst2DType_Horizontal, 0, 0 );
' }& n" |: u7 G4 V//定义spLine4 为垂直约束
' [$ D" A$ ~" q5 i( U1 VspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
% G' F" U" y, sNULL, Cst2DType_Vertical, 0, 0 );
, P2 A8 c- o9 P//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
$ q0 U  L+ y* O2 R) b5 j9 rNULL, Cst2DType_Length, 0, 0 );

$ R4 Z' K) T3 j//定义spLine2 与spLine4 的距离约束
; o- `1 Y1 a2 d  PspConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
8 l' k0 T% E. _9 \, B! n% ?NULL, Cst2DType_Distance, 0, 0 );
+ a/ _& S0 }: s2 [8 d//定义spPt_bottom_left 与X 轴的距离约束
' M3 c% \6 A! N  C& ]" x$ b3 OCATI2DAxis_var spSupport = NULL_var;
' x/ I, E6 }/ m6 v4 uspSketch->GetAbsolute2DAxis(spSupport);
/ N2 U2 \" p: s* G1 k" 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
$ o% P2 ^8 ?2 ]7 r" L1 C+ PspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
# S2 G6 j# t- ?! A% h  QspSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );

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