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
3 H5 d1 j% d. w. B//获得参考平面
CATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
5 x* h5 z0 C% z+ ~; }% K( S//初始化草图工厂
CATISkeTChFactory_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
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：
double pOrigin[3]={0,0,10};
double pH[3]={1,0,0};
double pV[3]={0,1,0};
: ~9 g; O) U6 I4 |& e- KCATISketchFactory_var spSketchFactory(spContainer);
; z6 j( N1 p8 I% S+ ICATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);


sp2DFactory(spSketch);
//下面创建点
7 C7 a; l8 Y0 X" v7 z& c2 c% Q0 HCATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
double pt_bottom_left[2] = {10, 10};
) ~4 y( G: f8 \  U! jdouble pt_bottom_right[2] = {50, 10};
double pt_top_right[2] = {50, 50};
0 y2 m  _3 |" J9 }( s3 k& n; ]double 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);
  k- r1 y# ~' D8 Z' V% FspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
$ X% g- ~" Q& d" B, }( H6 H//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
0 G, n7 x5 X9 I7 M! YspLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
spLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
//将线的首尾连接起来

CATI2DCurve_var spCurve1 (spLine1);
$ H# U% P& Z: O. {CATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
( s7 b+ h  k, o* S# ]CATI2DCurve_var spCurve4 (spLine4);
( ?" P: W& C& X! u$ SspCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
! N! t" ^4 K4 r) sspCurve2->SetEndPoint(spPt_top_right);
2 s. T2 o& |9 A- L7 BspCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
* r* ?2 I: L4 u! Y: rspCurve4->SetStartPoint(spPt_top_left);
5 W9 m- D( W9 y1 l. L5 zspCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
spSketch->CloseEdition();
5 s. \- ^7 N6 ?% C. ~1 D9 `4 O9 M& ^


, ~7 g5 y# x2 j+ V# h创建草图约束
CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
& R1 ?$ m( F; D. z9 ~//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
' I) @' o$ r) v& w- x5 x. z" a+ U//定义spLine2 为垂直约束
6 o: t. {* P$ cspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
& q4 k9 i; g* i. k//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
: X4 Z& `, Q) m5 [5 m) b3 Q/ pNULL, Cst2DType_Horizontal, 0, 0 );
$ ?) h  J0 B, N5 q$ p( t4 m* W2 w//定义spLine4 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Length, 0, 0 );
! @8 _  P# G, G7 I0 k
//定义spLine2 与spLine4 的距离约束
6 I: h# y4 G' @# m2 Q; RspConstraint2DFactory->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
. m) |: a! L% D0 a; R3 k3 dCATI2DAxis_var spSupport = NULL_var;
/ `: ~  e* K0 B' p# espSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
9 q3 h+ z0 @5 K% G2 f  E7 i# GspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
" I: @' Z2 S6 i/ Z, A7 Y3 ~" c2 F  F//定义spPt_bottom_left 与Y 轴的距离约束
$ M( i, p" A) s% u* KspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );


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