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
, h, ~  m+ H1 G5 f//获得参考平面
CATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
//初始化草图工厂
# x* N  @- U) J9 o7 A9 JCATISkeTChFactory_var spSketchFactory(spContainer);
/ `6 t, p/ Z. w$ v//在XY plane 上创建草图
' `7 ?0 r  N- F1 J6 DCATISketch_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。
! F8 L# m. [7 f9 |1 k' N0 c# m定义原点和方向：
/ i7 k0 t! h' a1 B* I5 V6 ]double pOrigin[3]={0,0,10};
0 C, ?$ C( X  C" w2 T5 e& ?double pH[3]={1,0,0};
3 l* f. {: h5 P$ ?" T4 L8 hdouble pV[3]={0,1,0};
+ x0 L$ {, p) OCATISketchFactory_var spSketchFactory(spContainer);
0 {+ H: B- ]# E* zCATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);


% w% t7 D5 n  E8 B. Osp2DFactory(spSketch);
//下面创建点
* z( d0 P1 {0 `, c- }- u+ K; n8 SCATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
/ P1 ^' l* f: _* d3 bdouble pt_bottom_left[2] = {10, 10};
double pt_bottom_right[2] = {50, 10};
double pt_top_right[2] = {50, 50};
- g! d' U: q0 `- |9 i7 Fdouble pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
7 V- ^( S+ ?! m- X; w7 t: zspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
& e, q& ?' U5 m) {* RspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
: W8 H. f/ g; i6 k" ^( d# K" K: m! CCATI2DLine_var spLine1, spLine2, spLine3, spLine4;
0 _- I4 Y( J5 Z+ S# PspLine1 = 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);
& t" N9 X% Q/ z$ U2 M* ospLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
$ A* f* f1 x( W6 W- {& _7 a//将线的首尾连接起来
; n0 G* E6 R2 j% {( C6 a8 `4 D
: u, T: `- r5 Y- z0 Y* ICATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
# \% n1 N# b! BCATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
8 o5 O3 J( O  B3 n' VspCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
, @5 U, Q! ?9 u7 IspCurve3->SetEndPoint(spPt_top_left);
5 f6 J9 e' ^9 X: fspCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
+ \. Z. Q5 c6 yspSketch->CloseEdition();


! t: z3 s8 e/ e! d6 \
创建草图约束
; M/ k- k1 C2 j  R  iCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
* @8 J& i& P# y! U; e9 o- ]//定义spLine1 为水平约束
, u& E8 a- V8 x' q. VspConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
0 M. O3 `& z" g% aNULL, 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 );
//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
5 c& E  [% k$ m* K- {5 ?6 j; SNULL, Cst2DType_Horizontal, 0, 0 );
( w$ B$ a7 U: h) z; |. P, h//定义spLine4 为垂直约束
8 U- r2 d: c8 K, D, \: V* ~  O8 X- a) pspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
- @% P; p9 F* c' h& a2 ~NULL, Cst2DType_Vertical, 0, 0 );
+ X3 {& a2 _; r* k, q7 i//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
5 g/ }6 [! Q5 e! j" gNULL, Cst2DType_Length, 0, 0 );
! A6 U7 h6 j; L  f( j# B% q: r
//定义spLine2 与spLine4 的距离约束
. D9 r5 ]: R) k) N1 espConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
4 {9 y( g1 I( D  a- ~NULL, Cst2DType_Distance, 0, 0 );
* \# Z: l0 {% B; s//定义spPt_bottom_left 与X 轴的距离约束
CATI2DAxis_var spSupport = NULL_var;
* A) U1 Z3 z- c( E- j* lspSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
; {9 F) o! e2 u9 P8 A$ }5 k% FspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与Y 轴的距离约束
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
, q8 A4 `0 K; _6 r/ i' dspSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
! t$ N- @0 u3 o" b0 ~! s  L) O