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
; A% ]2 `- K+ p2 g( u4 w% X//获得参考平面
2 X% _. l* @6 p$ UCATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
3 j3 E- f2 G0 c  R//在XY plane 上创建草图
9 s2 D9 P6 C* n5 s8 z9 tCATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
2.通过原点和两个矢量方向
" n" c$ W  J& O. q# X6 x4 b; V. D该方法通过定义一个原点和两个方向 pH、pV 进行创建。
9 U: t! X1 C' L5 V定义原点和方向：
% M+ B. `2 O! |4 I  wdouble 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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/ P  j$ D! U4 P& o# k' ?; Hsp2DFactory(spSketch);
//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};
3 L* v' A2 O. w. Q+ r: bdouble pt_bottom_right[2] = {50, 10};
) e8 M; P* i+ `9 r6 @) ~double pt_top_right[2] = {50, 50};
$ T8 V+ |4 X* u# t1 i# E- Xdouble pt_top_left[2] = {10, 50};
3 R8 `! D% [$ P: CspPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
$ B" f! [9 T5 W7 L6 H1 l6 O; ~spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
0 n# S! B9 U- \spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
: {) R, h+ z  R' V$ Q  lspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
# o2 U: ^; Z7 \: E) h0 [CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
* b4 f) H0 ?2 h% G) EspLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
spLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
" B1 n: R! F# B% H//将线的首尾连接起来
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CATI2DCurve_var spCurve1 (spLine1);
$ C0 {. [) X! cCATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
% |3 m& H! q0 q* O/ [spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
7 R3 g& F# h7 M$ G+ W( U0 _7 DspCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
0 G" E4 l5 R% k# \2 [- w+ w* l//然后退出草图：
spSketch->CloseEdition();
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创建草图约束
* U6 G8 [/ v4 K/ z% L  VCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
$ H7 Q7 V2 R$ D: t. N1 Y! b7 o* I8 E//定义spLine1 为水平约束
! o+ I. M; H6 C( DspConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
* `+ C+ [* x2 jspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
' E* ]  o, a7 M, M6 s: p% \//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
9 @! u8 k3 G/ eNULL, Cst2DType_Horizontal, 0, 0 );
+ d/ n$ C" a, `$ P, \4 q. C4 e//定义spLine4 为垂直约束
% L; J: a% r, u! F  jspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
" L0 V7 |: q& P2 @# O! ONULL, Cst2DType_Vertical, 0, 0 );
//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Length, 0, 0 );
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$ w! b/ N' T) T" i1 I5 M//定义spLine2 与spLine4 的距离约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
" K9 {/ i, e3 g+ e: n6 N) x2 dNULL, Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与X 轴的距离约束
" K3 U; S6 w8 c7 YCATI2DAxis_var spSupport = NULL_var;
" q5 U1 p7 T+ ^# i. f; RspSketch->GetAbsolute2DAxis(spSupport);
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
% ?& k' a2 O% ?2 e( f# DspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );


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