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
2 @0 o: {+ h2 S1 B//获得参考平面
8 ?2 P1 ?) {( s0 T& p4 _) UCATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
7 w6 z) z5 p& q+ R//初始化草图工厂
# Y% U) c% C* M+ f& S5 ^& W* sCATISkeTChFactory_var spSketchFactory(spContainer);
9 S: M* d) o: t2 Y& F9 _; B! |6 J//在XY plane 上创建草图
CATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
+ U8 |: M" P! O' j' b( O2.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：
) u6 R9 p+ C$ f0 m6 {/ F! c# M/ J  fdouble pOrigin[3]={0,0,10};
$ V# }6 [! e/ Qdouble pH[3]={1,0,0};
& t& d  J% o% T9 Xdouble pV[3]={0,1,0};
* |8 H9 M7 i: ], |- {* D# S1 w* G' nCATISketchFactory_var spSketchFactory(spContainer);
  e( ^' ?0 U! A  ?CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);


+ f3 K& w! b( \) z7 tsp2DFactory(spSketch);
//下面创建点
3 h" H2 R* d# N3 E% s/ hCATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
& k1 e, d" _' T" j9 h7 p' rdouble pt_bottom_left[2] = {10, 10};
double pt_bottom_right[2] = {50, 10};
& ]3 B( x7 {/ J& b4 {9 wdouble pt_top_right[2] = {50, 50};
: A6 P3 S, W: v1 L; e- Jdouble pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
" l1 g& B" F/ B6 q& Z! s//开始创建线
" s( l* ]2 l3 q5 iCATI2DLine_var spLine1, spLine2, spLine3, spLine4;
( Y/ B# x. f) N# A: |) ~spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
1 k: Y( d) `, Q1 b9 T/ XspLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
& A' s* y2 V3 d1 w9 b) |spLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
* d+ S* v* N2 j' {9 F: G9 _spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
//将线的首尾连接起来
& j* V  v7 n3 k* `( I% ]; U$ ?
; n! P* v4 t+ I% I4 H# }CATI2DCurve_var spCurve1 (spLine1);
+ W9 _! o/ d* v+ ?# V) |' G) z, O( ]CATI2DCurve_var spCurve2 (spLine2);
* {) n9 o& p) L. |CATI2DCurve_var spCurve3 (spLine3);
- Y' C: q& t3 A2 eCATI2DCurve_var spCurve4 (spLine4);
7 l0 |" z& Q. k' o4 z8 SspCurve1->SetStartPoint(spPt_bottom_left);
; W$ c: a7 Y) h8 U$ w+ ^: _spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
( N9 Y' n. x9 x+ N. i/ w+ I6 JspCurve3->SetEndPoint(spPt_top_left);
/ C$ x& w' C' Q; S( N3 u1 a6 r/ X3 pspCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
+ [* {+ n/ v4 ?0 hspSketch->CloseEdition();



3 F6 i2 W& ?+ R创建草图约束
$ {* `1 j& e+ `7 zCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
# l- M5 `+ A) @0 y6 w' \: u9 H1 wNULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
/ ^. O, w. u$ C( AspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
; m9 m* `* }! q2 [7 n9 X( INULL, Cst2DType_Vertical, 0, 0 );
//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
) M/ y1 l0 e- N' j/ H$ \% J& {8 M- zNULL, Cst2DType_Horizontal, 0, 0 );
: ]1 U  m' x  N1 n//定义spLine4 为垂直约束
8 M3 n! ~& Q% _# FspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
' `7 F" A+ `) V: y. kNULL, Cst2DType_Vertical, 0, 0 );
//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
- D6 A2 J$ H! {5 S" [NULL, Cst2DType_Length, 0, 0 );

//定义spLine2 与spLine4 的距离约束
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
  Q- Z. U6 j; L$ h( N: m8 S% mCATI2DAxis_var spSupport = NULL_var;
. C  c1 _! o1 X' cspSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
" B( O/ E4 ^. A  I- ~: L& P- x//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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