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
$ R) V. M9 E$ C  o) q7 U) cCATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
8 l$ Z+ H, g+ D" z//在XY plane 上创建草图
. w, ]% P  r) H1 p1 l) T( WCATISketch_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。
9 R6 B3 @; Y, D4 A* q; B2 }1 y( U定义原点和方向：
double pOrigin[3]={0,0,10};
3 ~- B! n1 j: ~) `/ edouble pH[3]={1,0,0};
' ~0 y! q* D. y3 M6 ^* X) \; `0 Rdouble pV[3]={0,1,0};
CATISketchFactory_var spSketchFactory(spContainer);
) l( W  H' e1 `4 d. ECATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
# w% `0 {9 V, X8 a8 c- l  W) y
0 u" R/ H, I! x) C% x& Q; {
sp2DFactory(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};
double pt_bottom_right[2] = {50, 10};
# L. j/ _; @9 y/ d6 d- ndouble pt_top_right[2] = {50, 50};
; U8 W1 q/ |# z/ Q$ Y* Adouble pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
8 Y. h' M+ A2 i: G: Z! ZspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
! M9 Z- D, V. M* VCATI2DLine_var spLine1, spLine2, spLine3, spLine4;
. ^" o7 e" `; _5 w1 O+ I3 mspLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
spLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
: l: ^* h5 g0 O- E7 F7 LspLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
8 w, m% _6 k7 ^8 d/ F6 b//将线的首尾连接起来

# \4 B  _9 ^: ?' ?- T! {CATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
, t7 t: [2 x5 |+ kCATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
9 ~# i2 t8 [5 w% {spCurve2->SetStartPoint(spPt_bottom_right);
7 M; z4 N& B/ nspCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
$ W+ ]& G5 V8 \2 `! SspCurve4->SetEndPoint(spPt_bottom_left);
8 U6 B, K3 F4 Q# E//然后退出草图：
spSketch->CloseEdition();

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创建草图约束
CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
) C9 S5 N4 X7 x4 J  {/ b9 \1 D/ [//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
+ ^3 o" x& R' g//定义spLine3 为水平约束
4 `' `3 ~- W. W4 C0 k3 a; y. }spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
4 y" Y/ `$ H! u* _5 u9 I! HNULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
: U% Q" y8 t1 R& a& S1 uspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
//定义spLine2 的长度约束
& v  j8 K& p/ M3 c1 N) SspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
! V/ x( G: h7 \& FNULL, Cst2DType_Length, 0, 0 );

//定义spLine2 与spLine4 的距离约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
+ v5 ?! ?: `9 B7 J' u5 S) B1 \1 pNULL, Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与X 轴的距离约束
) [; ?. e8 a6 f, ^; S. I1 RCATI2DAxis_var spSupport = NULL_var;
$ |# Z# c, V+ s: Z$ M& B+ S$ KspSketch->GetAbsolute2DAxis(spSupport);
: ?& r8 \$ j2 X! J* H  G2 S) d+ GspConstraint2DFactory->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
# o4 h, M$ }* e3 RspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );

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