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：
* B+ x7 K0 A* n1.通过参考平面创建
$ ~8 W7 x# z( M* p; n5 ~//获得参考平面
, y# c" ?0 `  w; N- vCATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
, e/ g3 ^6 s5 W& H//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
//在XY plane 上创建草图
6 t9 r& U5 W) X, I0 ^% kCATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
9 ?8 _+ n7 l2 [2.通过原点和两个矢量方向
0 c' h# C2 f3 [$ P$ {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：
# N/ V/ Q) A: V2 q4 E! p7 Ddouble pOrigin[3]={0,0,10};
, h# G, o- _4 L9 ?- Kdouble pH[3]={1,0,0};
# l" w. C' ^2 V! Q+ a+ ldouble pV[3]={0,1,0};
( S; `0 D+ W, y5 @9 v( p/ mCATISketchFactory_var spSketchFactory(spContainer);
3 x% P* n/ B8 O2 PCATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
$ E0 ]; Y% ?# z( e

/ a5 F* L% L$ M' F' x& jsp2DFactory(spSketch);
9 E. m& W4 X0 U+ _//下面创建点
/ F, x/ A  E* @" c! ACATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
double pt_bottom_left[2] = {10, 10};
6 d& h, O. N% w! c& qdouble pt_bottom_right[2] = {50, 10};
4 a1 D, [7 ?3 {1 ^7 c" {double pt_top_right[2] = {50, 50};
double pt_top_left[2] = {10, 50};
6 H1 d2 {1 H) V8 K) X& fspPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
0 X& D" `$ m( h- V5 I, lspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
* o' V2 W8 i  Q+ m& z( j6 AspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
" N% r2 s+ T0 C0 I6 A  OspLine1 = 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);
spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
//将线的首尾连接起来
8 [* r  |" O8 A% ]/ k* q* ?/ I
CATI2DCurve_var spCurve1 (spLine1);
1 m  t" \# s( P3 f1 LCATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
8 A! y' @7 B3 j: @+ i! c4 ]0 SspCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
! v9 Y2 Y% h% U: |  ?; W) ]5 _" CspCurve3->SetStartPoint(spPt_top_right);
' a" q6 B/ L. O, N) FspCurve3->SetEndPoint(spPt_top_left);
# A% v/ f) {" _. e( z0 hspCurve4->SetStartPoint(spPt_top_left);
! O  I/ C* g% t4 B8 P: ^spCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
spSketch->CloseEdition();



创建草图约束
9 ^6 U: s# ?, E) K6 _CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
' o" e) o* }% _3 P; y+ |spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
/ I* `! v% o% Y3 [  @7 x1 BNULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
0 {5 P4 J* y. u: o8 P4 ^spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
( f0 @! D; g& p  q) BNULL, Cst2DType_Vertical, 0, 0 );
//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
5 y( U1 j1 |6 W" Z. A8 vspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, 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 );
' w! I- W- \, W; ]6 w
: F: k$ B& c8 ^/ i4 [//定义spLine2 与spLine4 的距离约束
2 D# g8 |. m5 q: {spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
7 E# V- g+ U1 |9 v, p7 t; aNULL, Cst2DType_Distance, 0, 0 );
6 {5 N7 m  Z" l  t' j8 c//定义spPt_bottom_left 与X 轴的距离约束
  I$ g  r/ x. H' Y. {" e* J3 oCATI2DAxis_var spSupport = NULL_var;
* i2 [5 ?/ h- p! X$ ^' M  }spSketch->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
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );

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