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
( |5 j# g6 M0 y. j4 i2 S. N//获得参考平面
% X8 H8 y1 E0 \5 q# h0 ^CATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
//初始化草图工厂
# u" R- ?9 p( o! }1 A1 H3 o( ACATISkeTChFactory_var spSketchFactory(spContainer);
- K5 n! W) [/ E//在XY plane 上创建草图
9 W( o" T( d/ l4 \7 S5 g" kCATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
2.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。
  |* }: }* a: H6 G2 U8 z& x定义原点和方向：
9 H$ _* W' I5 n5 a5 [double pOrigin[3]={0,0,10};
6 L8 P% Z! q, l8 O' e3 Z7 j' ~double pH[3]={1,0,0};
double pV[3]={0,1,0};
+ |$ f; G! n7 C! ICATISketchFactory_var spSketchFactory(spContainer);
5 F% ~" w6 t% C, m  eCATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
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sp2DFactory(spSketch);
0 Q/ J4 ]# d2 w- ~. D//下面创建点
  A# w8 Z4 O. A6 s+ X) y; B# yCATI2DPoint_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};
double pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
$ Z7 V! N& M2 N( IspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
& c, @& w. W/ n; P% F/ rspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
# b; x/ M8 Z7 E% @+ \//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
) S( q& J5 u$ p* q; d6 CspLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
9 L% {8 R# R1 L1 D5 \spLine3 = 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

+ R1 W+ i. I9 @CATI2DCurve_var spCurve1 (spLine1);
; [9 u; `+ L1 n* |& G7 B# nCATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
) ]+ s: H) {2 ]& a; KCATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
) H/ N8 M. R( x& ?5 \+ W) vspCurve2->SetEndPoint(spPt_top_right);
8 `7 o$ u+ R6 ^* @$ R8 kspCurve3->SetStartPoint(spPt_top_right);
4 j4 |7 l6 ~8 H- S- X7 k0 KspCurve3->SetEndPoint(spPt_top_left);
( w; Q8 w1 ]; @) gspCurve4->SetStartPoint(spPt_top_left);
* {2 P  H. B* s  R& I0 w# y6 `spCurve4->SetEndPoint(spPt_bottom_left);
) a9 j9 Q7 r& }6 W( C//然后退出草图：
( X  V# O" K3 i: }8 e2 ~spSketch->CloseEdition();
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( N6 U8 d: S4 H8 `' U8 G. u$ g创建草图约束
( J6 ]1 l1 o0 C# q3 ]. o, r- WCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
# @- g$ _3 ?" N, Y4 c" m//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
8 O4 g" z+ n$ }& b+ x) LspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
9 ?" L7 s% d, E/ u% m& }  p* YNULL, Cst2DType_Vertical, 0, 0 );
; r6 H5 T* f, r6 W: j, ]/ z//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
- v8 L0 }3 w; pNULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
7 a9 f4 L- w# [spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
' p, w* h* C( j! SNULL, Cst2DType_Vertical, 0, 0 );
//定义spLine2 的长度约束
# A7 _% X9 V, Z! k0 f2 VspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Length, 0, 0 );
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( M9 V$ T' t" h: z//定义spLine2 与spLine4 的距离约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
NULL, Cst2DType_Distance, 0, 0 );
1 H/ Z: G5 U3 F4 O' N( [//定义spPt_bottom_left 与X 轴的距离约束
CATI2DAxis_var spSupport = NULL_var;
spSketch->GetAbsolute2DAxis(spSupport);
# {  T% h) J9 p8 q( i  _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
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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