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();
# b0 l) Y9 z- y$ `/ [8 `6 c//初始化草图工厂
# n; `9 g+ ]* C, ]CATISkeTChFactory_var spSketchFactory(spContainer);
6 Y9 T! r& Z+ ?//在XY plane 上创建草图
CATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
0 u9 c! T* O  d+ U1 b" B2.通过原点和两个矢量方向
, V4 C: c% W8 u- c+ f该方法通过定义一个原点和两个方向 pH、pV 进行创建。
2 d# ^9 o, t& v0 B! K" A: x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};
2 o* }% l! O3 J3 {3 _: cCATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
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$ s1 i7 P. _/ R9 j. ^) s$ ssp2DFactory(spSketch);
, m! L. B! I; h) f2 @+ O# s//下面创建点
5 l7 ]( P7 b8 E$ F% ^$ Z4 jCATI2DPoint_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};
- |6 v) [2 ?: C7 T# j% Q! Adouble pt_top_right[2] = {50, 50};
: [; r  k& W/ U7 v- odouble pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
9 _# a0 n. [! s7 o# U. espPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
3 O% D- L$ z0 X, w& GspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
6 h5 b) O% c: z* yCATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
% f5 e  t4 c5 u0 i- @( i8 Y& OspLine3 = 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
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* J6 \. v, ?( g3 C. `% HCATI2DCurve_var spCurve1 (spLine1);
' r4 V5 T" w& q6 e* \" u, i1 yCATI2DCurve_var spCurve2 (spLine2);
! c$ P3 u) m0 X) o' W( M; j& g" b. [CATI2DCurve_var spCurve3 (spLine3);
/ e8 Y2 R: r: u# l. \9 }2 XCATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
2 V( R  q, a8 H* a# m+ bspCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
7 O3 \0 M0 T% o, UspCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
) ?7 T# F& B9 ]# J& T( e( mspCurve4->SetEndPoint(spPt_bottom_left);
9 J7 ?& m" z. A% ^  W- N//然后退出草图：
7 C. b2 R, \/ u( R+ ]7 V( G$ ospSketch->CloseEdition();

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5 n6 w/ i# c5 y5 f) A4 S$ \4 \创建草图约束
  N4 c4 X+ o% Q3 y$ ^1 Z4 XCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
4 h: c; B. L! _* X( A' {( Y; L//定义spLine2 为垂直约束
0 t; `- a" u0 @8 I: N4 P4 UspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
5 }/ t% c. C- s% x+ {' W: n- RNULL, Cst2DType_Vertical, 0, 0 );
5 w% Z* {7 G# v- S4 L& W  \8 B//定义spLine3 为水平约束
! C; f$ ]& O6 s2 v. BspConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
7 y! Y  j1 |; D* U//定义spLine4 为垂直约束
* E% k2 _+ \1 s  H5 k, p+ fspConstraint2DFactory->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,
: a6 @+ n# R* @NULL, Cst2DType_Length, 0, 0 );
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* `: b) n7 g* f1 ~  \, |/ T3 {//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
CATI2DAxis_var spSupport = NULL_var;
% |+ O. @( R, w! S+ |spSketch->GetAbsolute2DAxis(spSupport);
6 e/ ]. W# q, ]6 N" {# CspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
$ h) R  _# O+ B/ {  }' wspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与Y 轴的距离约束
( x5 i" u$ T- w/ ~spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
5 V8 R3 [$ D2 E+ {8 qspSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );

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