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：
$ Z' t) k" k: r8 l, Y! v" Z' ?1.通过参考平面创建
3 p& h+ E% v2 N' t, f5 S$ T5 j//获得参考平面
" G5 X; p" `; S) FCATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
( H0 a; D3 `. w6 l5 k; `) U0 `$ U0 ^//初始化草图工厂
" [, s( T6 B3 d3 Y, ~  b) ACATISkeTChFactory_var spSketchFactory(spContainer);
//在XY plane 上创建草图
' ^4 l- ], f: ]5 K+ Z+ j' P9 hCATISketch_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。
定义原点和方向：
: y$ O/ f6 L1 ]% \double pOrigin[3]={0,0,10};
double pH[3]={1,0,0};
$ m& B/ R  m1 b: S3 qdouble pV[3]={0,1,0};
& Y2 P. V4 ~! l' t& JCATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);


1 t2 I1 X8 W% p' u- _sp2DFactory(spSketch);
  u1 @4 o7 Y  M5 u2 Z//下面创建点
CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
# J+ I/ f9 i3 z5 r5 Q- b( Edouble pt_bottom_left[2] = {10, 10};
/ a" J# \' B5 S* Mdouble pt_bottom_right[2] = {50, 10};
double pt_top_right[2] = {50, 50};
: ]$ a" R' K, W" H" odouble pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
, I% [- P: k' C& x% Y2 Y& FspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
5 d# v0 A  `+ h6 K0 z& tspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
1 s) s1 R- J- y' s) |: L2 K# L/ w//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
9 j+ \; R- S% L" j) {2 v: XspLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
% C7 M; a* ]$ S# g  V" F//将线的首尾连接起来

6 N9 j6 b$ j% }! Q- R, y3 eCATI2DCurve_var spCurve1 (spLine1);
( W1 @* V2 s& `$ u$ iCATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
3 V0 x4 c+ }8 ]! Q3 m' \spCurve1->SetStartPoint(spPt_bottom_left);
) z+ V3 _. x2 S% Y/ q/ r  kspCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
1 X8 x8 a; k* Q# {spCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
& q7 T7 n( S, yspCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
spSketch->CloseEdition();
+ I6 S! V4 s; s


7 ^6 T3 h/ l7 x7 a7 U. t! T2 w创建草图约束
: y( \) F0 j5 W9 S9 r9 z5 [CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
9 |( g  v. n; fspConstraint2DFactory->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 );
: `* M, p! t' A/ F//定义spLine3 为水平约束
  _( E3 \# M5 L4 x, \; h8 i# mspConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
6 O% t: S; r6 `# j8 x3 {$ q8 GspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
- s, s" W3 A2 h! [/ x7 g//定义spLine2 的长度约束
0 m; j; h- J+ LspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Length, 0, 0 );
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//定义spLine2 与spLine4 的距离约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
NULL, Cst2DType_Distance, 0, 0 );
2 |) l& ~/ l  ^//定义spPt_bottom_left 与X 轴的距离约束
CATI2DAxis_var spSupport = NULL_var;
spSketch->GetAbsolute2DAxis(spSupport);
* L. E$ y& M& a; qspConstraint2DFactory->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
7 f5 R/ }/ U) zspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );

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