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();
/ S2 W$ v. u* K. J. _6 n//初始化草图工厂
" Y: \0 n. l: D0 QCATISkeTChFactory_var spSketchFactory(spContainer);
2 i/ {: k8 U+ I/ _% ^4 o//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
* g2 Q6 q" ?" M8 j7 J该方法通过定义一个原点和两个方向 pH、pV 进行创建。
2 k" E4 |2 J6 e定义原点和方向：
$ `3 w/ D" _2 ?+ R/ t% A- qdouble pOrigin[3]={0,0,10};
double pH[3]={1,0,0};
1 X: U" g3 q* x( }  U! Gdouble 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
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};
! L4 {( N1 o1 C, c% h* W# |double pt_top_right[2] = {50, 50};
double pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
4 U$ R. E. E8 J( i! r$ T+ q0 GspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
& `$ e) N5 v* y, r& L//开始创建线
  f8 A& ~3 M7 f; ACATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
( Y( Z) O. ?0 A9 I) _0 X1 \' G+ q6 ^spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
: K/ [$ D' s0 b$ K  aspLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
- B# l+ M, F4 {3 l- j( C//将线的首尾连接起来

CATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
2 i. H) F9 Q8 H- \CATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
  e$ i0 F! _- D5 k0 e3 p, d! J( MspCurve3->SetStartPoint(spPt_top_right);
; |, Y" E2 X) MspCurve3->SetEndPoint(spPt_top_left);
6 j+ ~6 K3 N! L- E9 P7 FspCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
" \4 L  m! ~, ispSketch->CloseEdition();
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创建草图约束
+ m# ^% [1 u# D/ F7 N$ NCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
$ }* S& r, k; d2 W& a# `$ K) l1 xspConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
& B- Z$ m! F3 q1 n0 _* G//定义spLine2 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
. S4 Y5 _* `* rNULL, 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
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
1 V7 X" P# ]' XNULL, Cst2DType_Vertical, 0, 0 );
: v. x, ^( x. n) N' j//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
* b  k- |$ ?/ I7 O7 e, M7 lNULL, Cst2DType_Length, 0, 0 );
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4 z: R8 x1 u7 u0 M# F//定义spLine2 与spLine4 的距离约束
+ p$ N5 q5 J( @8 w% p& s* V; f$ mspConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
" P& v1 a; R/ |3 A/ oNULL, Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与X 轴的距离约束
  u) e% }0 H5 a, B% OCATI2DAxis_var spSupport = NULL_var;
spSketch->GetAbsolute2DAxis(spSupport);
( ^! |( }* z; O3 Y, `. cspConstraint2DFactory->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,
* S# F0 O9 n0 U9 E3 {; JspSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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