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
* _. C" z8 O2 `//获得参考平面
# `1 g  B: t$ B& ZCATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
//初始化草图工厂
$ F$ S/ W) D  r1 M. f9 o9 I" N$ ]0 QCATISkeTChFactory_var spSketchFactory(spContainer);
9 d) A' A: d0 X8 q3 G//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
% s7 a" f, `- g; T% ?. I该方法通过定义一个原点和两个方向 pH、pV 进行创建。
. j6 F7 H! z. g; F. v% u5 ?9 c9 ]9 Q6 A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);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
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6 L8 h. U+ f2 q- Ssp2DFactory(spSketch);
' [6 V3 v# _3 |//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};
* \6 [1 _% p; d. d$ H, ]9 a5 i' `double pt_top_right[2] = {50, 50};
double pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
$ d1 |1 P  D( u: k, A2 [spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
# h1 j! n2 @- P$ Q- @# u! gspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
' e2 O2 A* k( IspLine1 = 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);
+ g5 B  ~" Y9 [) v: Y' sspLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
8 [1 q0 M' C; u, B1 Y//将线的首尾连接起来
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0 [0 N1 Z5 q/ w; cCATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
) O0 }% Q3 I3 t; x, D6 Y2 Y; gCATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
; [/ C+ s1 c% k9 V) h* |spCurve1->SetEndPoint(spPt_bottom_right);
+ V8 _) D) K2 L' n" ]3 CspCurve2->SetStartPoint(spPt_bottom_right);
- z2 `. T  Z1 B; E3 ^# |spCurve2->SetEndPoint(spPt_top_right);
, a; i  v1 l8 Y: |spCurve3->SetStartPoint(spPt_top_right);
3 V, ]3 g) q+ u; Q, @spCurve3->SetEndPoint(spPt_top_left);
2 ~* o" B6 D2 ~& ispCurve4->SetStartPoint(spPt_top_left);
$ W& |& r9 ^7 A1 x& v" ^1 _+ l) u/ sspCurve4->SetEndPoint(spPt_bottom_left);
  h# u  t% M* ^6 Z4 Q% \, }& ^: \//然后退出草图：
6 \3 I  w$ j7 s# FspSketch->CloseEdition();
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1 ?) W3 y; S6 P' y创建草图约束
CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
9 S+ B' G/ w$ M, @7 J//定义spLine1 为水平约束
1 n. c& e: w4 m1 HspConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
3 r: P6 z( Q' Z, d$ Y3 v//定义spLine2 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
, i8 V3 G+ J0 k- @: f+ }4 s//定义spLine3 为水平约束
2 O+ R. ~4 j/ u$ o5 x/ O4 g: V* j  YspConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
( k) P% _+ x$ [* H//定义spLine4 为垂直约束
/ m$ _: @- @9 DspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
1 ]& N! x' e$ w- c' d; O2 WNULL, Cst2DType_Vertical, 0, 0 );
. V. W/ j; Z( y+ ^$ H//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Length, 0, 0 );

//定义spLine2 与spLine4 的距离约束
; q# Y0 Y: _* i3 X+ AspConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
NULL, Cst2DType_Distance, 0, 0 );
& I8 T1 [+ Y. f( [. t/ g7 h//定义spPt_bottom_left 与X 轴的距离约束
CATI2DAxis_var spSupport = NULL_var;
) n" t9 i; P" {' HspSketch->GetAbsolute2DAxis(spSupport);
! \. c. n/ x' Y4 C/ l0 SspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
+ _) j# K0 {- `2 W# v$ FspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与Y 轴的距离约束
, y, {5 V& Z) l3 rspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );

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