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
CATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
, ~% h" t) I7 A" V( k% i5 p//初始化草图工厂
! f* e" W$ m0 \; i' n# aCATISkeTChFactory_var spSketchFactory(spContainer);
//在XY plane 上创建草图
CATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
2.通过原点和两个矢量方向
, p" _2 Z7 b; n# [该方法通过定义一个原点和两个方向 pH、pV 进行创建。
# D5 c' |0 C) j定义原点和方向：
* w$ T: `% J: i9 |double 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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sp2DFactory(spSketch);
//下面创建点
$ ^' _9 l3 y% ^. X& O; xCATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
double pt_bottom_left[2] = {10, 10};
2 n: g( I! r/ J) {) X; sdouble pt_bottom_right[2] = {50, 10};
  [9 U; }" x4 V$ kdouble pt_top_right[2] = {50, 50};
+ h9 n: O. Y: H: {$ r! T/ U1 cdouble pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
$ @& a; q1 T: {, `4 e5 v, b% |spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
  k8 J4 J( I; t, X! k+ AspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
5 ^8 J5 A$ u# c: k9 J3 hspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
1 t# f. C5 ]3 B' z7 RspLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
: w4 o' u7 p( l$ h. |+ |9 Z, SspLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
* S" o, d; A% D% ]. N4 _* g3 tspLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
//将线的首尾连接起来
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5 `4 i& j, y! vCATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
$ _# |/ L( g% e: tCATI2DCurve_var spCurve3 (spLine3);
" u2 q8 y5 ]; q) M: p/ xCATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
! S. v5 t$ U3 `spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
6 P" l/ z8 U8 J6 h. a! `( tspCurve2->SetEndPoint(spPt_top_right);
' p2 h4 o5 Y8 OspCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
spSketch->CloseEdition();
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创建草图约束
CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
6 n5 r: u8 b8 {6 }4 t; x/ h# W2 xspConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
6 f. W3 K" e. |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 );
//定义spLine3 为水平约束
& u" ]9 W/ R, `2 u2 kspConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
+ {& }0 `9 {, O( P3 _4 T; D//定义spLine4 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
2 E. W. ^- b4 |. d5 S1 a//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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/ P1 ~# g# a% k2 v0 r, F' F0 U9 P//定义spLine2 与spLine4 的距离约束
, T9 T2 O$ l( F; r; A$ }spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
NULL, Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与X 轴的距离约束
8 R  y" ]& P" C, S* D9 a0 DCATI2DAxis_var spSupport = NULL_var;
, z' w" F; i, T& j' QspSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
0 @8 z9 `% M- D$ T. V4 qspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
+ N# l* Q8 f) {//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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