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
CATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
0 o- d. l5 M1 C- g' h//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
; X0 [' j& h% t2 b  J3 \//在XY plane 上创建草图
% V+ `( w% }; @( }* ^, F6 D" k; UCATISketch_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。
定义原点和方向：
7 r0 x. v+ U5 K9 tdouble pOrigin[3]={0,0,10};
double pH[3]={1,0,0};
# ?* N* X' i. J* z* j4 b& bdouble pV[3]={0,1,0};
CATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);


- x" y/ @$ j# W0 Asp2DFactory(spSketch);
+ R- X: P$ v6 b, ^//下面创建点
+ g& A% ~% c$ N( m+ zCATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
7 ?" ~" R! ]7 S! e& _8 Mdouble pt_bottom_left[2] = {10, 10};
double pt_bottom_right[2] = {50, 10};
4 O; |8 b" M5 m0 Kdouble pt_top_right[2] = {50, 50};
double pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
9 h1 S  }* ^% A* y1 N3 TspPt_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;
* x5 K& H9 ~' P% G6 s9 m' jspLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
$ {& P: E7 X% e" L4 X' }; nspLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
. m# K$ h8 ?5 n% k# d2 G( wspLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
//将线的首尾连接起来
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! T* U% e& z! c$ Q1 `CATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
: _# m2 r0 I8 O1 l% z  ]4 T4 MCATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
  a! b5 B: @, R+ [' bspCurve2->SetStartPoint(spPt_bottom_right);
5 w4 t$ Q3 `/ M. s0 J; x" L6 GspCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
) m% J+ z# e8 n; y0 V% O& U* Y2 ospCurve3->SetEndPoint(spPt_top_left);
2 X* D9 [6 l% S& g& w1 tspCurve4->SetStartPoint(spPt_top_left);
7 j7 w4 t8 ?7 nspCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
* S- ~/ G0 Q3 m( _( W# d/ bspSketch->CloseEdition();
6 r: }; H. U0 `, T/ ]3 y


* Y$ {) J1 c4 y, k+ ~& t! R创建草图约束
( _9 n, P0 H9 kCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
3 Y. L9 b, M8 j" y# g" U//定义spLine1 为水平约束
& W. W! x4 Q" s# c1 CspConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
" G9 T/ L8 C1 S# pNULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
( w3 R" b8 `8 ^% B4 e' ]NULL, Cst2DType_Vertical, 0, 0 );
2 p3 r0 j6 V8 M" F* i//定义spLine3 为水平约束
' f8 l5 P4 T* ^& }5 `' mspConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
4 _0 \0 Y5 _% f. H: |7 pNULL, Cst2DType_Horizontal, 0, 0 );
5 G1 T% o( q: L8 U8 `+ a  \+ J//定义spLine4 为垂直约束
$ T" R1 {+ N  a% h% QspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
) ?( B7 V$ e' l3 y% y, pNULL, Cst2DType_Vertical, 0, 0 );
//定义spLine2 的长度约束
# ~. n& k0 g6 D5 tspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Length, 0, 0 );
! x0 o5 |) w  @
//定义spLine2 与spLine4 的距离约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
- V' U9 i( O  [- l+ RNULL, Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与X 轴的距离约束
CATI2DAxis_var spSupport = NULL_var;
4 o; ^( N! Q3 `6 rspSketch->GetAbsolute2DAxis(spSupport);
' M( q- Z4 S6 _+ lspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
/ ~8 t2 w2 j# E6 `2 A( P+ b//定义spPt_bottom_left 与Y 轴的距离约束
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
6 \. R. }4 b2 m! YspSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
$ e# X4 w0 ]% G9 m$ a
; W% R- }% r: k5 g7 o/ Q