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：
4 h& k) `& @* R  z1.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
  \. S% N" d! [7 Q" s5 aCATISkeTChFactory_var spSketchFactory(spContainer);
4 A" N3 }" W) Y$ B4 z- _//在XY plane 上创建草图
CATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
6 O+ T* @4 J% z+ M2.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。
& f* L* x) Z: x: T: b& M3 t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};
CATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);

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% p: u4 E: ^( gsp2DFactory(spSketch);
//下面创建点
  m  Y4 `/ {1 \8 d* s+ WCATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
, C" k& \; J, }1 z6 J& V2 b5 [double pt_bottom_left[2] = {10, 10};
8 j/ _, i4 b) bdouble pt_bottom_right[2] = {50, 10};
9 Y6 B7 a( g/ u: wdouble pt_top_right[2] = {50, 50};
: x  |2 [3 S1 o+ I3 d; D* I/ ]9 Idouble pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
) g0 H0 f/ p  ospPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
1 J9 ]9 G2 `0 f- uspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
' [/ {& |, }' z4 q% e8 mCATI2DLine_var spLine1, spLine2, spLine3, spLine4;
, u- |/ y4 S+ r8 `* t9 XspLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
/ ?: `. Z# J) ZspLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
( }- Q' `6 `$ m' EspLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
6 |$ v  ^( I3 L7 i/ _. l8 Z( M//将线的首尾连接起来
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CATI2DCurve_var spCurve1 (spLine1);
2 m0 Y, s0 Q. k4 B0 bCATI2DCurve_var spCurve2 (spLine2);
CATI2DCurve_var spCurve3 (spLine3);
* s8 B5 Q6 F: T2 s( ICATI2DCurve_var spCurve4 (spLine4);
; J0 W) _9 ?$ G& h. k' ?+ k4 n; y8 f/ A9 nspCurve1->SetStartPoint(spPt_bottom_left);
5 m5 b; ?3 N4 Q" m: D8 sspCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
" R2 p3 T/ a1 M# q9 mspCurve2->SetEndPoint(spPt_top_right);
0 P9 ~; ]$ Y8 _# K& i1 `9 B5 \- uspCurve3->SetStartPoint(spPt_top_right);
, |9 P& d1 K, n" f" ?) {' cspCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
! s, A7 x2 `4 x7 h& kspCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
spSketch->CloseEdition();
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创建草图约束
$ n! A9 l+ Y. \' \8 ~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 );
/ b  h9 i+ U3 j//定义spLine2 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
' X0 m4 G( c7 L//定义spLine3 为水平约束
* a" O; n# E8 u# Z+ _spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
* m/ P/ ~( F; K6 ?NULL, Cst2DType_Vertical, 0, 0 );
//定义spLine2 的长度约束
! s; @1 _7 O; K/ v* }' k, \spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
  @3 d7 |3 v  y3 `NULL, 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,
: y( w4 p$ Q# ^& w9 C+ yNULL, Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与X 轴的距离约束
# K* T5 ]) |' F/ UCATI2DAxis_var spSupport = NULL_var;
% y; w8 T* b' a1 L" q9 |7 v1 kspSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
+ o4 _# i  H' i7 gspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
& t! P9 b. j' l7 ?" C2 n& _//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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