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
0 i! J/ P- g6 T//获得参考平面
CATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
: N4 J( M6 G: d//在XY plane 上创建草图
0 x7 v* L2 h2 Y5 wCATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
2.通过原点和两个矢量方向
$ I! F2 n" X, q6 Y该方法通过定义一个原点和两个方向 pH、pV 进行创建。
: w8 ]. T( n5 a  I$ \: I, Q/ u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);
* e9 z* q/ @% z! TCATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);


sp2DFactory(spSketch);
//下面创建点
, G$ ?5 H0 g( _2 [7 v* s) }: R( MCATI2DPoint_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};
$ a* Z! I+ f8 `# i; }4 l% [double pt_top_right[2] = {50, 50};
' h! p; }; M: Ydouble pt_top_left[2] = {10, 50};
3 B0 _& I! q! l  k  nspPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
4 x  F2 V  q% e. B! @: v# e. d/ VspPt_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);
$ w9 S+ y6 Q1 E' Q3 y# D+ ]spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
spLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
; o7 C; _' ^3 g& i; }spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
) W" w: k9 y2 u4 @: m# P5 V5 S9 c//将线的首尾连接起来

CATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
4 z2 ~# z% Y% x& N/ CCATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
* _# B, @0 V; U% K- tspCurve2->SetEndPoint(spPt_top_right);
  l: G, @  ]- {9 x9 JspCurve3->SetStartPoint(spPt_top_right);
! m2 |; A' S6 A; m0 ispCurve3->SetEndPoint(spPt_top_left);
8 O" _3 l# v& ospCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
1 q# O7 O/ P. AspSketch->CloseEdition();



创建草图约束
9 x4 `8 Y1 f& C# f" [/ [7 zCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
  w- a( @7 i+ c2 H3 K+ U! Q# g1 N//定义spLine1 为水平约束
2 y" e1 O. X0 f! ]spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
/ o( y6 u% a" c  D//定义spLine2 为垂直约束
1 F5 `7 `4 l0 n; ]: W8 W8 VspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
2 ^; O1 @$ y0 U/ v0 G6 {//定义spLine3 为水平约束
4 D" c  N' G9 q( cspConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
. [* q% n! l4 H: H+ b/ k//定义spLine4 为垂直约束
5 [& p/ ~5 D1 F% g4 Q; mspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
//定义spLine2 的长度约束
2 _# ]4 X* V1 E* QspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
' q7 k: H9 ~& q( ~6 Q: B& O$ O4 CNULL, Cst2DType_Length, 0, 0 );

//定义spLine2 与spLine4 的距离约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
4 z/ t' X; t3 l- PNULL, Cst2DType_Distance, 0, 0 );
9 a8 G( W0 T- l//定义spPt_bottom_left 与X 轴的距离约束
. d6 r. ]2 e0 B0 ICATI2DAxis_var spSupport = NULL_var;
8 C& K2 m( s* C: I# E+ O# mspSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->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
6 E" O- _+ Z. O$ A0 Q7 l+ MspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );

1 S( D' f& J# B* N  c