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
. G7 {6 M8 ~" l- ]' y& U# ^, F//获得参考平面
( ], Q0 Z; p: J" j. u! WCATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
. q9 I. l3 L0 v# x//在XY plane 上创建草图
CATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
" e, K& @( W/ W2 B7 g2 n2.通过原点和两个矢量方向
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};
# Y0 W7 @& c) o( {1 MCATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);

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/ j6 D/ i7 s5 P0 W5 n1 Tsp2DFactory(spSketch);
- K' M! K% K, s0 L2 k//下面创建点
' [2 u0 Q: F2 _4 o0 Z* wCATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
double pt_bottom_left[2] = {10, 10};
6 N' }$ w  V7 \+ f/ t& n: [8 w6 Udouble pt_bottom_right[2] = {50, 10};
$ a) c# S- x; {6 u, K+ zdouble pt_top_right[2] = {50, 50};
2 ^1 t& y6 W+ ddouble pt_top_left[2] = {10, 50};
spPt_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);
//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
5 Y2 A. t( t' n. F$ ^& M7 `" e# D% FspLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
4 Y8 T4 @; G4 S. ]( bspLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
0 M2 q3 I& s/ L2 }//将线的首尾连接起来
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  r( e  o2 z& `CATI2DCurve_var spCurve1 (spLine1);
% n2 `' y7 R2 K& jCATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
3 S) `1 G( u5 Z' S7 DspCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
9 j" X9 O3 D. e2 ]( y% rspCurve3->SetStartPoint(spPt_top_right);
* H' r2 ]6 X7 z! R* C5 j8 i( pspCurve3->SetEndPoint(spPt_top_left);
$ [+ U; N' |- @- ~spCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
1 n5 G, [8 {$ a- D" Q//然后退出草图：
spSketch->CloseEdition();
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; y$ w- }3 m& K+ X' F创建草图约束
CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
5 @6 n2 \$ |* [spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
3 t, D! ]' Y, E6 Z- E+ @* |, x) `//定义spLine3 为水平约束
2 N% f4 i& K/ kspConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
1 H/ k0 m( O5 s1 H1 c+ B/ O: `NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
/ D! X# e1 R& r. YspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
# K0 C2 {/ l; J2 Q( U//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Length, 0, 0 );
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7 g' ^: U- a4 ^+ c, @: }8 A//定义spLine2 与spLine4 的距离约束
: g4 ~. S! m1 `' @5 bspConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
NULL, Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与X 轴的距离约束
: S; m. b: z# [8 RCATI2DAxis_var spSupport = NULL_var;
spSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
; O" q& w) t1 m- {$ j, WspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与Y 轴的距离约束
- C& C( ]: v# I, q+ q  fspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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