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：
# p5 \" O7 b# B: w! T$ D! t1.通过参考平面创建
* b, t' R; X+ E! U//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
CATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
2.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。
: v! V8 g/ E+ F定义原点和方向：
double pOrigin[3]={0,0,10};
0 A$ E" ]1 Z' v" I; Tdouble pH[3]={1,0,0};
, `# E( b# A7 L; {: j: fdouble pV[3]={0,1,0};
CATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
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sp2DFactory(spSketch);
9 @/ E2 |, \% x! W5 ~//下面创建点
$ Z! g$ N4 q2 c$ BCATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
' D! o2 {7 n' B4 y2 ^+ ~double pt_bottom_left[2] = {10, 10};
9 b( W  S9 }/ R* f5 Cdouble pt_bottom_right[2] = {50, 10};
, e) L1 @( }4 idouble pt_top_right[2] = {50, 50};
double pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
& R6 Q8 n3 Y7 @% D* espPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
9 H+ x( S# P- A: {! U//开始创建线
& m" d2 T- h$ F4 f/ O! J8 R+ oCATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = 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);
//将线的首尾连接起来
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CATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
1 Y2 y. M8 O- b( @CATI2DCurve_var spCurve3 (spLine3);
8 Q+ P' c$ n5 Y. ]; O. ZCATI2DCurve_var spCurve4 (spLine4);
3 A, R8 Q& A$ T  K' N! u" h8 y8 K. o) cspCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
  x; S- x) ~! q8 h1 kspCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
3 m! U. p; a3 a1 [$ D//然后退出草图：
spSketch->CloseEdition();
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创建草图约束
$ ?) u; |/ p% j8 u$ D8 k1 oCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
% R: |0 M& A7 ?3 B( q//定义spLine1 为水平约束
  |, p/ K9 R9 E' |* j, yspConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
/ k2 s, [9 D. j. x2 P3 J/ ?; }NULL, Cst2DType_Horizontal, 0, 0 );
$ e1 Y3 m! l; R) @- W9 y//定义spLine2 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
//定义spLine3 为水平约束
4 h- ?% s3 y1 Y& Q5 `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,
0 T& c6 f* B2 _& l  cNULL, Cst2DType_Vertical, 0, 0 );
: b3 b6 O% [2 }9 \8 S$ P4 Z//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
% w4 Z1 b9 v# I. a3 \5 g' `: gNULL, Cst2DType_Length, 0, 0 );

//定义spLine2 与spLine4 的距离约束
7 u( p. \7 [! A" E5 B" D4 cspConstraint2DFactory->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;
spSketch->GetAbsolute2DAxis(spSupport);
" Q: @) k& T7 Z7 V& s0 rspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与Y 轴的距离约束
3 G$ E% K3 f! H6 t7 n3 z- gspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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