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
) Q- ^3 q9 w0 B! ]% F/ m" @5 T' ACATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
//在XY plane 上创建草图
) T8 H6 G8 ]$ L* n) JCATISketch_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。
6 Q5 K( X; W) U. I, [- B/ c  O定义原点和方向：
double pOrigin[3]={0,0,10};
' x2 `7 i( f+ f) e+ w" D) Ldouble pH[3]={1,0,0};
9 t4 j" }0 B& w$ _1 hdouble pV[3]={0,1,0};
CATISketchFactory_var spSketchFactory(spContainer);
9 i: {/ h0 [+ `9 T4 XCATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);


sp2DFactory(spSketch);
, m8 R0 b  \) s, U( [//下面创建点
CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
+ ~2 _5 N2 C- _1 gdouble pt_bottom_left[2] = {10, 10};
double pt_bottom_right[2] = {50, 10};
, k) F# i8 r5 t+ _/ Jdouble pt_top_right[2] = {50, 50};
3 v8 W  K' }& S$ ^1 R! k; Xdouble pt_top_left[2] = {10, 50};
2 M4 z6 y* x4 H# h2 T; G/ ^spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
: H9 d1 \; h9 i3 g8 P( A+ U& FspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
- s; q$ m8 L/ L//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
) u( N8 i+ `( G; c% r- a3 ospLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
3 ]2 P* f% G. r; }spLine2 = 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);
//将线的首尾连接起来
" X7 L4 H" S0 K: t
8 i" B8 @5 n4 Y7 {CATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
5 U) ]) _6 v7 G( x) X: pspCurve1->SetStartPoint(spPt_bottom_left);
  g( K8 @4 ]  k8 d% p# {, |7 jspCurve1->SetEndPoint(spPt_bottom_right);
' ]! O  w+ A9 u& N8 J& Y2 J& B  w3 \spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
) O" \. [/ T- t7 _8 O( f: @spCurve4->SetStartPoint(spPt_top_left);
5 v! l, m5 y$ n+ C. T! _spCurve4->SetEndPoint(spPt_bottom_left);
2 R  a- S$ P/ S# k+ @1 f//然后退出草图：
' r9 l6 ]0 `. P' P! h/ EspSketch->CloseEdition();

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4 p2 v2 Q' J* \0 ~
创建草图约束
CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
2 A3 I( m3 a& P4 M, T, l//定义spLine1 为水平约束
+ o2 w3 T) ?6 Q6 v+ l: EspConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
) R' p; e: u: O% h0 y5 q- mspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
; u* |& ~1 w5 L. V2 n7 M0 z//定义spLine3 为水平约束
+ b5 M  Z3 V7 k* ^spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
$ {' Q- L  j( ?NULL, Cst2DType_Vertical, 0, 0 );
//定义spLine2 的长度约束
! ?% h3 Q. J5 X# h7 v: Z, r! fspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
4 ]+ d1 b1 }1 j% R1 Y% v5 m! XNULL, Cst2DType_Length, 0, 0 );
" W, Y6 B0 ]: d! t6 k; C  Z, E
//定义spLine2 与spLine4 的距离约束
  b: S1 ~: I; u7 n1 A+ PspConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
( B" Z% M- J6 }4 T: j$ N* gNULL, Cst2DType_Distance, 0, 0 );
6 k% |: h0 U2 F$ x# k. \6 {; `//定义spPt_bottom_left 与X 轴的距离约束
CATI2DAxis_var spSupport = NULL_var;
2 }$ t: r4 n( J9 \1 pspSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
5 m; r* s3 X1 j( Q- `$ z' f  X4 ~spSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与Y 轴的距离约束
3 D& S" H+ H5 tspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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