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
. c" ?4 i; N8 x& A3 U0 U7 Z$ ^  e% t//获得参考平面
# C- F+ E0 ]3 e' s/ ]/ {! h6 I+ ECATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
; N7 l2 r( D1 ^  `+ c//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
- D( s$ T. S' N; W* }& I* ~  ~% j//在XY plane 上创建草图
0 m2 r! p  a3 ]6 k  S$ G2 PCATISketch_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。
- x% p) }1 ]: y定义原点和方向：
' r/ e6 {1 b7 a6 Zdouble pOrigin[3]={0,0,10};
double pH[3]={1,0,0};
3 r! X3 r( W! U! ]' gdouble pV[3]={0,1,0};
" k# }- ]* o. [$ C: X5 r1 sCATISketchFactory_var spSketchFactory(spContainer);
% P. i+ K3 P# h1 \9 H8 R) ^+ R+ ?CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
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$ Q  e1 _3 P! c( e" H% I# G0 V( msp2DFactory(spSketch);
//下面创建点
CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
! A: B! d7 }0 W. Z& v' V& cdouble pt_bottom_left[2] = {10, 10};
  M" w: n) n" ndouble pt_bottom_right[2] = {50, 10};
& V8 @1 l  _( ]6 Ddouble pt_top_right[2] = {50, 50};
double pt_top_left[2] = {10, 50};
% Q+ s5 }2 D0 P  x/ ]) v. C# m" |spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
0 G, `6 p/ D. b& o. F8 XspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
( u4 r( F% i/ lspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
% i9 o4 |4 A. u7 f; lCATI2DLine_var spLine1, spLine2, spLine3, spLine4;
% `4 C# o9 z8 W: |spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
2 O0 W& i6 o$ `, c* `- W$ @spLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
0 l( R2 [) t5 g; r5 a! `//将线的首尾连接起来

CATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
( n* f* y  `4 H% z+ |: tCATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
1 o, J* D5 l. _8 X! Y0 K! ^spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
: T$ y" F6 \, a! ]% C& B: i/ \spCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
+ y# ]: D# `8 N# O) n1 g7 nspCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
- N. m4 |, j6 [) g% s% K: N3 XspSketch->CloseEdition();

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创建草图约束
CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
; R. G9 f- i& R- ~9 K' L' ~! c  o//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
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
; Y7 b" N3 w$ y( Y( M//定义spLine4 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
! w6 @! Z/ H# z8 V: [2 h* LNULL, Cst2DType_Vertical, 0, 0 );
//定义spLine2 的长度约束
) G: r' V! z- q% s2 X! C, kspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
5 U( u/ P/ Q' f7 }NULL, Cst2DType_Length, 0, 0 );

6 d+ ^0 b- w6 j1 y. ]0 i/ B//定义spLine2 与spLine4 的距离约束
1 T( D2 v0 |( ]2 `) F9 espConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
NULL, Cst2DType_Distance, 0, 0 );
* S  q  M$ A0 x3 H2 n! ^//定义spPt_bottom_left 与X 轴的距离约束
* f5 i& M, X  v% k3 V7 e0 yCATI2DAxis_var spSupport = NULL_var;
spSketch->GetAbsolute2DAxis(spSupport);
& ?* g% _) l% r" y. x. `+ wspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
: |1 c; E" p( E# i* w" U3 n' l/ WspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与Y 轴的距离约束
8 U% `) t: t9 U5 x9 L0 }9 p, Q# EspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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