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
; ^/ ^& i1 {! E' f//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
' z: M  r/ \9 {1 G$ N' FCATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
2.通过原点和两个矢量方向
( m3 Y; p4 ^" A- f- O. m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};
double pV[3]={0,1,0};
CATISketchFactory_var spSketchFactory(spContainer);
% d5 [$ _; k% ^: g  K$ D8 MCATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
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& u( [  ?* T8 C, n$ Esp2DFactory(spSketch);
# u# C7 ?# _  K0 |/ v  ?8 n//下面创建点
: h+ i( J+ i' g4 O" K' [CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
double pt_bottom_left[2] = {10, 10};
double pt_bottom_right[2] = {50, 10};
double pt_top_right[2] = {50, 50};
: M6 O4 q& L- c' h* P1 S4 j! ~double pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
* `0 `' o3 h0 V  CspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_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);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
6 d3 u& ?% d: LspLine3 = 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

, U' d; _$ _( J' f6 [CATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
- N' Z3 a) n# o( }# v# v. ICATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
* s1 l/ q0 \  g1 C( Q1 q2 }$ hspCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
4 J7 k: Z9 A: p# {, q4 i; H9 I) _) gspCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
4 Y) w( T3 F5 n& U6 NspCurve4->SetStartPoint(spPt_top_left);
6 ]5 {/ h+ Z( o: u$ i6 lspCurve4->SetEndPoint(spPt_bottom_left);
2 `( f  f( Z+ q! L: S* [. {//然后退出草图：
  B' Z4 [2 t) x, S! Y! J3 X0 FspSketch->CloseEdition();
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创建草图约束
# [' P. n! a7 }% E( z% G4 W4 n/ [CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
  w0 `6 J- z/ B- F/ M( MNULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
$ o' k7 F6 H, c. z: ?2 espConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
* `& `9 s/ M# `0 C8 O: c4 H5 GNULL, Cst2DType_Vertical, 0, 0 );
/ {, u+ M5 c0 o//定义spLine3 为水平约束
" G5 H( W" H9 g6 GspConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
% ~% q& S" O( NspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
  o: x: J, n. J+ Z* S3 }NULL, Cst2DType_Vertical, 0, 0 );
$ O3 k, t5 j" \! U//定义spLine2 的长度约束
1 ]3 I! |0 ^  Q  fspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
2 A; e& ^& L5 {5 `' C7 [NULL, Cst2DType_Length, 0, 0 );
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//定义spLine2 与spLine4 的距离约束
# a  ]+ R' b! i& E' i3 ~* rspConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
NULL, Cst2DType_Distance, 0, 0 );
# V* l6 z2 }( h1 M, j//定义spPt_bottom_left 与X 轴的距离约束
/ o3 I) Y. i* K. s' I7 S9 V4 f1 s( rCATI2DAxis_var spSupport = NULL_var;
spSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
6 b; \' l% ?$ |3 ^& @//定义spPt_bottom_left 与Y 轴的距离约束
  ~8 m3 T  g, c% M) W) y& \3 w7 b6 }: KspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
! A& j, Z' D& \* `3 l/ u8 w( JspSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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