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
CATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
, n; _( l4 v7 y* j//初始化草图工厂
) w, P$ [- l4 R* X6 Z7 O  P9 lCATISkeTChFactory_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
' g' R& R2 R6 _: Z) }. [; B该方法通过定义一个原点和两个方向 pH、pV 进行创建。
. Q) ^; K; S1 L. T8 q# i定义原点和方向：
double pOrigin[3]={0,0,10};
7 |: H+ L. S% q8 Jdouble pH[3]={1,0,0};
double pV[3]={0,1,0};
( @* v* a- [# p, ?, n* v6 kCATISketchFactory_var spSketchFactory(spContainer);
9 ?  x$ C9 s8 r# OCATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);

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sp2DFactory(spSketch);
4 G4 r2 `4 M* y//下面创建点
CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
& s$ s/ D. _  |! i6 Sdouble pt_bottom_left[2] = {10, 10};
0 o5 j# d, Z6 _9 Wdouble pt_bottom_right[2] = {50, 10};
double pt_top_right[2] = {50, 50};
, \/ a$ x: i# S3 R; ^4 rdouble pt_top_left[2] = {10, 50};
  X, P3 z( c6 F) z' y& S0 zspPt_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);
$ K* l3 ^- t9 s) B//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
  h, }* U0 J4 h! ^+ F/ Q/ sspLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
2 u7 v8 @& a+ B5 G9 ZspLine3 = 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);
* T2 q. ^# l; V3 uCATI2DCurve_var spCurve4 (spLine4);
: v9 z6 S5 y% s; s$ q4 ]spCurve1->SetStartPoint(spPt_bottom_left);
) |2 j- }9 e, N+ ^% O& S( j, J$ rspCurve1->SetEndPoint(spPt_bottom_right);
- N) `" w1 z2 H3 g0 O. lspCurve2->SetStartPoint(spPt_bottom_right);
5 U4 G% p% ?" y. @/ P( M0 ~" n% KspCurve2->SetEndPoint(spPt_top_right);
/ b2 I; I1 I" K# ]& c$ aspCurve3->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：
( Q+ T8 r5 R7 O3 [+ ^spSketch->CloseEdition();

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8 a! a3 E, G6 ]: t; e, n- Z% e创建草图约束
' p; T; o$ e/ [. Y  C1 y8 oCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
3 @) e' r+ J0 N! L//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
) m$ ~+ s! l- f- @: u# U//定义spLine2 为垂直约束
$ Z) n0 r! y1 V# G: t# aspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
6 f" b% G) N- J! O* @; F  O3 F//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
9 h! X( P3 x1 |$ W* {8 R0 G* H/ V3 ZNULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
$ U. Y. ~0 r7 W$ S, D//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
3 W3 G- f. l9 b  kNULL, Cst2DType_Length, 0, 0 );

- j  f- ]* A) V# H! V" g( ^7 k* I4 b) b//定义spLine2 与spLine4 的距离约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
: ~) [. J, {$ |& ~! u) D$ B& @NULL, Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与X 轴的距离约束
1 ]6 p+ m5 c  Y) L  ]CATI2DAxis_var spSupport = NULL_var;
spSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
, t& o  K3 z6 @' e; l; espSupport->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,
- R) V( t, t# J! MspSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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