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();
//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
//在XY plane 上创建草图
0 l7 J( f! T; B; q; hCATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
* w5 j# w7 w* F. y4 g' H' [! u2.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。
+ O' p: ~: R, R* N& Q7 g# X定义原点和方向：
double pOrigin[3]={0,0,10};
1 z$ h$ t8 E; o9 f7 }1 p' {double pH[3]={1,0,0};
double pV[3]={0,1,0};
0 x. }4 E' J+ @% `( E3 W* \6 SCATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);

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/ ?5 v" }# r7 L- ?( |sp2DFactory(spSketch);
//下面创建点
* {/ d& A& n/ U; x1 BCATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
double pt_bottom_left[2] = {10, 10};
9 ~2 V& u4 T5 G( S% Rdouble pt_bottom_right[2] = {50, 10};
double pt_top_right[2] = {50, 50};
double pt_top_left[2] = {10, 50};
, P( v" v  L, s! YspPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
2 Y, p6 O# `$ o  XspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
! @. g3 }/ T: g0 d4 Y1 y: @spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
" ^( _9 W; L1 y( Q% ZCATI2DLine_var spLine1, spLine2, spLine3, spLine4;
& A/ E4 Q- Z- @+ P2 L! LspLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
6 v# B& C) [; A7 F: rspLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
" A  @! Y: c: H4 {% k7 WspLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
/ {0 M0 n/ `3 c  A& n5 p: uspLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
7 Y/ X& v' z/ N; P/ _* R/ h, G0 o//将线的首尾连接起来
9 v, ~' n' Q& G
  ]6 h2 R! L  V' f* WCATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
% d6 }# z$ M$ Q) l# E" eCATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
( {* R- t) Q  a; {! M! YspCurve1->SetStartPoint(spPt_bottom_left);
. v* ]$ Q! l5 E0 C1 I8 }% @spCurve1->SetEndPoint(spPt_bottom_right);
. j3 v, i/ K8 J! _  B$ m# \spCurve2->SetStartPoint(spPt_bottom_right);
1 R, i7 U; H- ?- L1 N5 \spCurve2->SetEndPoint(spPt_top_right);
- v: T+ C6 F- W1 ]8 Q* @spCurve3->SetStartPoint(spPt_top_right);
" U2 Q6 a8 d" _+ S. D( T$ b3 C5 EspCurve3->SetEndPoint(spPt_top_left);
# q/ ]3 U" B9 ]# C) }spCurve4->SetStartPoint(spPt_top_left);
$ k- l, R% u4 I' G4 zspCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
spSketch->CloseEdition();
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# ]8 z! }4 H, Q* Q9 M创建草图约束
CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
7 K% d4 D: J7 J% t# l! ], B7 wNULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
  L; C  d0 V  t5 u8 g. mspConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
& z' q/ b$ p. p, t- K" ^0 l+ l//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
# v7 X6 w# c, @$ xspConstraint2DFactory->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,
9 K7 @# ?1 Z8 B0 B  yNULL, 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
% d4 s( L; Z8 m! _8 b8 mCATI2DAxis_var spSupport = NULL_var;
7 d2 P  ^5 O; b9 U- `spSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
. e1 n2 z: A0 s1 nspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与Y 轴的距离约束
  {2 [$ B1 n( NspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );