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
: g7 k! A7 o  b! J1 C) hCATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
0 m9 X9 }% U& a' |/ K4 S! u//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
//在XY plane 上创建草图
2 K4 q. C- \6 _2 t+ _" N. S* A6 @CATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
2.通过原点和两个矢量方向
7 e& I+ F4 T4 S3 ~6 W# i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：
; w8 _1 w8 R+ v1 z, T/ {$ y) f5 Z& a8 C0 sdouble pOrigin[3]={0,0,10};
double pH[3]={1,0,0};
. _7 _1 `' V: W# Gdouble pV[3]={0,1,0};
CATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
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; @1 W0 U3 E! T  o: h5 Tsp2DFactory(spSketch);
6 u! D( o9 K9 D" _# ^% @. r//下面创建点
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};
% i" E0 s) C( x$ o9 ?+ \+ c2 Kdouble pt_top_right[2] = {50, 50};
double pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
; X6 o. [) a% o5 CspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
5 K" w; l" }0 n4 T5 q) S  GspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
4 s: x  O+ G! F//开始创建线
( O. O$ K7 Y* P4 o) [CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = 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);
/ p1 c2 U# j; w" R" ~& @, }, R  [spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
//将线的首尾连接起来

2 ]  u1 P  e- b9 \+ ~4 X: R2 \CATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
0 L. a3 i" K8 t: ?CATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
/ ~* p0 t$ s. s* jspCurve1->SetEndPoint(spPt_bottom_right);
! `; V  b! ]! p) u% v  AspCurve2->SetStartPoint(spPt_bottom_right);
7 u+ J. ?- O. NspCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
# F/ D5 t0 \2 I. r! l! MspCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
+ K6 C; `3 T! {: l2 U+ B( K//然后退出草图：
* `3 g2 Y" u" Q& @: sspSketch->CloseEdition();



创建草图约束
' c% \4 I: \' s6 ~, ^! LCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
- L- r# i1 e. G: X% M. S3 n: dNULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
//定义spLine3 为水平约束
. Q* B7 }/ T* S( W  e1 }, \spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
& J3 i- ^5 [- N$ n6 Q$ u- `spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
//定义spLine2 的长度约束
2 o6 b! ~% u; `" fspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Length, 0, 0 );

//定义spLine2 与spLine4 的距离约束
4 Q+ g  j3 `4 s7 A2 g% K1 a. XspConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
NULL, Cst2DType_Distance, 0, 0 );
9 J9 O. K& W1 ?* H  K/ I& @//定义spPt_bottom_left 与X 轴的距离约束
CATI2DAxis_var spSupport = NULL_var;
( y( k; h( e5 A" c9 F; z4 |spSketch->GetAbsolute2DAxis(spSupport);
& H; a* t2 l% S* z' G5 RspConstraint2DFactory->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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