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
* Z. t; k$ k; _* b1 d9 E- a: wCATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
//初始化草图工厂
; \1 x, M  D/ g' N. DCATISkeTChFactory_var spSketchFactory(spContainer);
//在XY plane 上创建草图
CATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
6 q$ ]5 L! Z1 o' X  V- v$ ~! d2.通过原点和两个矢量方向
9 i/ N1 o7 C% n' V- ]( X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：
' [! G  h3 w! |  u8 `double pOrigin[3]={0,0,10};
double pH[3]={1,0,0};
; }( b+ ^3 ^8 P9 H5 l0 n- `double pV[3]={0,1,0};
CATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
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sp2DFactory(spSketch);
0 K- J% j% B7 o( p/ }, W//下面创建点
' t4 @$ C3 F+ v4 f, KCATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
4 S: x: l1 \3 N0 F) s! Idouble pt_bottom_left[2] = {10, 10};
double pt_bottom_right[2] = {50, 10};
$ L& s9 i, t2 e$ Edouble pt_top_right[2] = {50, 50};
8 o1 [0 Z5 b2 X  _7 G; W: C8 Odouble pt_top_left[2] = {10, 50};
. I9 o* {8 o0 R2 @- QspPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
& o/ V, p% z* p) gspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
& [4 J8 O2 U5 [8 A7 I! AspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
$ Y7 a  {, @- b0 ]9 uspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
- D# g5 _7 S2 v  p7 A1 dspLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
3 L; q3 W$ ?% u& j5 F0 K: DspLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
5 w+ ?2 N/ m7 [& r//将线的首尾连接起来

CATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
" E" f# C. g' C8 Z" w' a: GCATI2DCurve_var spCurve3 (spLine3);
1 Y$ k8 W1 F, ]CATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
+ ~7 S5 Z3 o/ sspCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
# W+ d+ L/ ^  I! ^" l6 C2 tspCurve2->SetEndPoint(spPt_top_right);
$ u9 }. r! D$ }2 c; a/ PspCurve3->SetStartPoint(spPt_top_right);
- S3 p0 J; _+ k! TspCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
% s+ k# l6 G: Y1 K//然后退出草图：
+ U9 v8 y6 E+ N2 G0 qspSketch->CloseEdition();



创建草图约束
; |% w* j* @# e5 K" ?3 B  NCATI2DConstraintFactory_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,
$ M- P1 h+ a. QNULL, Cst2DType_Vertical, 0, 0 );
! B! H2 c2 ?( _9 ]/ h//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
, E8 H9 l, F  r0 }( SNULL, Cst2DType_Horizontal, 0, 0 );
* F4 j* D6 l0 X//定义spLine4 为垂直约束
1 U  P; {; R0 F. n( f5 u' uspConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
& U% T4 p- C: D, D+ X//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Length, 0, 0 );

6 l3 \" ?6 q2 n//定义spLine2 与spLine4 的距离约束
6 W( `% C  X6 ~" K: xspConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
1 K4 Y( {! h! X1 w" f* HNULL, Cst2DType_Distance, 0, 0 );
& |- x& C- s' J$ n4 F//定义spPt_bottom_left 与X 轴的距离约束
CATI2DAxis_var spSupport = NULL_var;
. w" ^' r& ^) k2 wspSketch->GetAbsolute2DAxis(spSupport);
1 k5 X, j  s5 qspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
3 H$ }3 S3 k. q  f5 tspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
- Q1 k6 u% }/ {0 @//定义spPt_bottom_left 与Y 轴的距离约束
  I2 J$ t1 ]7 J$ V2 v3 \# ?spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
! {) K0 T2 [( D; nspSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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