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：
$ q& J) g) S, q1.通过参考平面创建
//获得参考平面
( [% d; Q- ]  i- |- C2 U* W2 g4 LCATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
) I5 n( t% L" q' M! P, f! _: q, B' [//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
该方法通过定义一个原点和两个方向 pH、pV 进行创建。
2 O7 H, Q" g$ `" v- _定义原点和方向：
7 F5 d, E8 `+ Mdouble pOrigin[3]={0,0,10};
1 T8 D: K$ T% l; r9 Kdouble pH[3]={1,0,0};
double pV[3]={0,1,0};
+ ~! {* y+ Q5 h. `CATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
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  \8 I9 S0 U& @! \* ^. p9 esp2DFactory(spSketch);
//下面创建点
CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
; X7 u" R& ?2 {; Y! Ddouble pt_bottom_left[2] = {10, 10};
+ I% _7 k( y9 rdouble pt_bottom_right[2] = {50, 10};
double pt_top_right[2] = {50, 50};
double pt_top_left[2] = {10, 50};
; ]8 Z9 ~6 @1 Q: vspPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
! B/ Y6 x7 ], Z7 a& M! \spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
1 b6 Q  m% ]8 \3 KspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
# v# F( w# j! p6 b//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
3 f3 b8 w3 v- f, Y( `: |4 n) ^spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
3 _' ?+ z4 M9 a+ R0 A1 |3 t+ pspLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
! R- d$ x% p- @; ~spLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
( d3 [, R; a. }spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
//将线的首尾连接起来

8 c% ^" H. n2 BCATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
! q3 D. D/ m( U9 B9 j% UspCurve2->SetStartPoint(spPt_bottom_right);
) b7 ]( y, K. m( Z; I8 m' M) |spCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
! L, `% a+ m2 u& _6 i; nspCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
5 W5 }% P( P" L( v6 R- G//然后退出草图：
spSketch->CloseEdition();

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" a6 I; u6 d% @* v. b创建草图约束
9 {5 s) L4 `& q1 A& m5 N+ rCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
4 Y+ q: m* p0 ?# i//定义spLine2 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
- g0 U7 J2 S/ f. T2 wNULL, Cst2DType_Vertical, 0, 0 );
//定义spLine3 为水平约束
6 C/ h3 T3 Q$ V5 j& `* y# vspConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
  f/ ?1 Q& |6 xNULL, Cst2DType_Horizontal, 0, 0 );
* `6 J6 k* o; ]. i2 M//定义spLine4 为垂直约束
: R3 M5 s2 m4 \5 AspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
0 l3 D! G* i) E  g0 G( l) ~, K' jNULL, Cst2DType_Vertical, 0, 0 );
! {- q+ p4 U. {: p. f: `7 \//定义spLine2 的长度约束
, M# u  S  o8 y6 F& E/ O3 jspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
$ V8 ^5 l  ?+ s4 J0 f4 a! X0 D1 qNULL, Cst2DType_Length, 0, 0 );
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//定义spLine2 与spLine4 的距离约束
5 V) z( T" a0 CspConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
+ X9 s, f1 h: v. O) e, o7 b0 a' jNULL, Cst2DType_Distance, 0, 0 );
+ v1 S- y% N: Q1 I9 P& `( c//定义spPt_bottom_left 与X 轴的距离约束
CATI2DAxis_var spSupport = NULL_var;
5 _6 v) Z# N  j7 W* m: v3 GspSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
$ x7 P/ }2 M" K! I4 |6 M//定义spPt_bottom_left 与Y 轴的距离约束
/ h( v9 {1 @( E5 f% BspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );