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
$ A, m7 r6 a+ p; M6 d7 xCATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
4 z. R: [" S' Q' Q//在XY plane 上创建草图
) M, x# Y' R0 e) S) fCATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
1 A) x' {5 |9 z+ z% G2.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。
' y/ P  x- H! ]定义原点和方向：
double pOrigin[3]={0,0,10};
. H5 j- p! C5 E+ Q8 y: j, tdouble pH[3]={1,0,0};
5 z6 q: h/ h6 I' L# Ydouble pV[3]={0,1,0};
( x# Q, L3 Q; ]  pCATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);

) N9 @5 a' b+ ^! [+ p* {
8 D7 s  K! L8 lsp2DFactory(spSketch);
//下面创建点
CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
9 m4 i+ C) }: bdouble pt_bottom_left[2] = {10, 10};
7 J1 Q3 G: m3 G; Gdouble pt_bottom_right[2] = {50, 10};
9 ?" |' t& e1 [1 c7 |0 A0 @+ v: Qdouble pt_top_right[2] = {50, 50};
5 p+ _0 P, j. O) ?; Adouble pt_top_left[2] = {10, 50};
1 D1 a- E- c0 g; n( lspPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
" R5 y2 v) e' ]$ Y- u6 gspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
9 s% z8 |  Z' Z/ |+ N: FspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
+ a7 a0 x& m2 D6 x* L' Y: E. J2 o/ hspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
# ~7 Z1 S; O7 {9 j) z5 }* {CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
" t& A" U# K9 h5 E* \* ^spLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
) j( ?' \, g" v//将线的首尾连接起来

CATI2DCurve_var spCurve1 (spLine1);
  S4 G( l: i6 P) QCATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
; N$ P" S& O, M! ]# qCATI2DCurve_var spCurve4 (spLine4);
1 c9 I0 I) m8 b! j8 PspCurve1->SetStartPoint(spPt_bottom_left);
3 V4 x+ H/ M8 p# t+ v! L; _spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
( e# r# o1 s! v( h: \spCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
  ]/ v1 \( d& F1 u5 R! y  l//然后退出草图：
spSketch->CloseEdition();


+ v" F7 b: B: ?4 `6 G" Z0 M
创建草图约束
7 c) C2 \: k) L) O8 z) p0 aCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
1 t2 T0 e. m+ O' `6 X" e  E* P//定义spLine2 为垂直约束
! n# i8 e' \7 Y# f! Z, ?* QspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
" E; U% E- \; q) B1 j4 KNULL, Cst2DType_Vertical, 0, 0 );
( ~, b5 t- v% |% w, f//定义spLine3 为水平约束
3 a4 t" e" _- r! r" lspConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
3 |3 ?2 d! B& r/ P& w7 c: W( O$ c; F//定义spLine4 为垂直约束
* U5 N" f" J5 R  A) H) ^. }: _spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
2 C" Z$ g' {- D9 v//定义spLine2 的长度约束
) B/ @. ~( p$ g! u0 N' s9 S% Q% HspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Length, 0, 0 );

9 _7 D6 _, c' ^8 G& H//定义spLine2 与spLine4 的距离约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
, u* Q4 A/ E7 S4 n4 S: ]: MNULL, Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与X 轴的距离约束
. }& N+ h! F. S% k8 GCATI2DAxis_var spSupport = NULL_var;
0 p- N( w- s5 g) G! aspSketch->GetAbsolute2DAxis(spSupport);
. x8 G) M* Q6 t( B& }# S0 c9 ]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
& h& M$ \& G% H/ O2 |" AspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );