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：
" w; L4 Q- z# w$ b! [( G7 B1.通过参考平面创建
//获得参考平面
CATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
$ Y6 y' W) a% `* X" d//初始化草图工厂
8 k4 F, D) M* F( P# [/ lCATISkeTChFactory_var spSketchFactory(spContainer);
. @( N; `7 x1 r' e* v( l6 S//在XY plane 上创建草图
CATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
  I/ y5 ^( e4 c$ K) M2.通过原点和两个矢量方向
1 N4 N+ U. _: M+ v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};
$ k( c/ S+ E  ~9 f# ydouble pV[3]={0,1,0};
& Z8 K: L- ]" G6 g9 N0 b1 M/ ~CATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
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sp2DFactory(spSketch);
//下面创建点
CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
& `( l5 W" r6 |double pt_bottom_left[2] = {10, 10};
double pt_bottom_right[2] = {50, 10};
6 n1 l6 G% Y2 L( `5 v$ ], ~double pt_top_right[2] = {50, 50};
$ P+ w! C* ^0 p$ R# x: {5 Zdouble pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
2 a0 Y+ Z% ^. q' v: y( CspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
% J- E/ K! m% U- v//开始创建线
+ Q8 G: m) z( L6 G/ [1 iCATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
1 h0 C' o8 B0 l8 X5 G/ uspLine2 = 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);
7 |7 r) F. A# ]* J$ w//将线的首尾连接起来

CATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
6 r$ x% Y" |4 A/ Q2 c- ospCurve1->SetStartPoint(spPt_bottom_left);
5 }8 b  y' b# j5 l7 o. q% gspCurve1->SetEndPoint(spPt_bottom_right);
5 w" b1 X& Z) `' r4 f3 x& nspCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
6 m  O/ ^- h! l% D" S" GspCurve3->SetStartPoint(spPt_top_right);
* }+ {# a$ D+ U, p. C6 cspCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
" s7 U: @. z9 B! E  P; I9 QspCurve4->SetEndPoint(spPt_bottom_left);
# g1 P; }$ y' x- u) M5 _0 t! p//然后退出草图：
spSketch->CloseEdition();
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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,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
. e; n7 {- Z  a% MNULL, Cst2DType_Vertical, 0, 0 );
7 w8 P( O: D0 m/ K( K, f4 R//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
  _/ L* B' W6 ~8 f3 J2 J5 K//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,
9 f$ P3 j6 ^# n; Y- ]4 a7 Z/ GNULL, Cst2DType_Length, 0, 0 );
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//定义spLine2 与spLine4 的距离约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
2 B7 C' k' P5 HNULL, Cst2DType_Distance, 0, 0 );
& c6 ?2 Q+ A& b6 v6 U- ~% Y//定义spPt_bottom_left 与X 轴的距离约束
CATI2DAxis_var spSupport = NULL_var;
' b; J, J# a# U1 c$ c- vspSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
5 s1 i3 J% q& m/ n; [$ Q- WspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
4 Q. ?. {9 g1 O0 e4 `2 [, R//定义spPt_bottom_left 与Y 轴的距离约束
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
3 b* B0 A# P% B9 J1 L2 j5 Q- |spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );

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