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();
) }: A6 \) y# F//初始化草图工厂
0 Q7 D  D4 f4 t. x) S4 n) h8 VCATISkeTChFactory_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
' ^+ L5 P$ S0 r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：
% G3 i  D; D# c' {! ?$ v, f6 b3 }double pOrigin[3]={0,0,10};
double pH[3]={1,0,0};
double pV[3]={0,1,0};
CATISketchFactory_var spSketchFactory(spContainer);
, {7 W/ k( E# L, o' ]CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);

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$ G& h# l1 `4 I; ~; n; ksp2DFactory(spSketch);
# X/ [6 P3 b; R. J4 i. T//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};
) W- \; @% e* C0 `: H: R1 {double pt_top_right[2] = {50, 50};
double pt_top_left[2] = {10, 50};
3 ^# T7 ^" Y6 qspPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
! A! W/ V( H* S0 FspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
" b2 |" m) [4 }0 |. Q# a  m' t& v6 mspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
& ?& Y3 o. m1 x//开始创建线
/ L/ \' q& P; \4 m9 {. j- r7 xCATI2DLine_var spLine1, spLine2, spLine3, spLine4;
* y  a  o9 r! t  Z6 ?0 a1 p/ CspLine1 = 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);
/ I( e0 h  y6 p' @+ b0 @! [$ X//将线的首尾连接起来

- F0 w& J! O) L( mCATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
6 ]5 H* j& W1 `: q8 YspCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
1 [& i- j) t) \1 p2 zspCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
( p0 A+ w; a$ o( l9 CspCurve4->SetStartPoint(spPt_top_left);
$ T$ X8 Q- A" N, @# J3 ]spCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
spSketch->CloseEdition();
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. c1 k& k3 F, f/ X创建草图约束
CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
; u9 F; r& ~6 @//定义spLine1 为水平约束
, S% D6 \0 e- e1 y+ lspConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
- G( v" y" x. r9 l6 t//定义spLine2 为垂直约束
  J. a; U- D2 K- r$ h: zspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
( c' Q8 F8 V$ p4 ZNULL, Cst2DType_Vertical, 0, 0 );
& F" i" c9 m/ C0 |. z2 N* O//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
: k$ K& ?! ]' _) cNULL, Cst2DType_Horizontal, 0, 0 );
+ a0 w8 h+ K& h//定义spLine4 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
* Y3 @2 M+ q5 b8 V1 [* W/ hNULL, Cst2DType_Vertical, 0, 0 );
  y) _- }1 L( G/ O% Y//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
) z1 h$ y) l" O! G& u  D4 R  {NULL, Cst2DType_Length, 0, 0 );

//定义spLine2 与spLine4 的距离约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
2 z9 g8 k: G' J; L9 b3 qNULL, Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与X 轴的距离约束
7 r: E7 ]- x* x, C( fCATI2DAxis_var spSupport = NULL_var;
$ D7 r' E& q  j) p, jspSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
# w* H1 C3 v9 \1 m  H1 q4 [2 AspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
; i2 N5 S. {0 {1 y+ y//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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