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：
/ u* R0 ^/ `/ g6 E1.通过参考平面创建
//获得参考平面
) t! X( d) i" I- N% ?CATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
; X! X! V: K5 R% {9 v7 K# M//初始化草图工厂
. z  d9 `0 [6 oCATISkeTChFactory_var spSketchFactory(spContainer);
/ a6 g: U+ R. l- ]//在XY plane 上创建草图
CATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
3 r, B# V7 k. I4 m' a# R2.通过原点和两个矢量方向
0 }8 U. H! B# V该方法通过定义一个原点和两个方向 pH、pV 进行创建。
  Q& ^, x/ j$ v3 q定义原点和方向：
double pOrigin[3]={0,0,10};
# }0 x, }5 i% d0 adouble pH[3]={1,0,0};
  c4 y, K( W' O6 r5 P1 v# d6 Rdouble pV[3]={0,1,0};
$ m: ~6 I+ }7 p4 U. x! `CATISketchFactory_var spSketchFactory(spContainer);
. F/ ^; }) ~7 H- vCATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);


sp2DFactory(spSketch);
//下面创建点
1 G3 w1 R- `3 v6 p' k) e2 XCATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
double pt_bottom_left[2] = {10, 10};
double pt_bottom_right[2] = {50, 10};
% G2 i6 y, ]5 w" p9 Y4 i7 vdouble pt_top_right[2] = {50, 50};
+ S' v& ~4 b! H/ [& I4 Idouble pt_top_left[2] = {10, 50};
9 M7 F2 `) I3 m4 x9 f1 EspPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
* ]% q( e/ u( N7 m  V+ NspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
+ r2 h$ r+ K' p5 e7 z0 \spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
( X) y! Y+ A* i//开始创建线
CATI2DLine_var spLine1, spLine2, spLine3, spLine4;
( G) Q: ^2 s) c; F0 SspLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
& t! [& P% ?, R( Q8 e+ JspLine3 = 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);
CATI2DCurve_var spCurve3 (spLine3);
1 N0 x) e  g' v1 o/ J: G: m' P$ N, cCATI2DCurve_var spCurve4 (spLine4);
% Q: b7 D7 X1 ospCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
6 M1 ~; k$ E, O& I+ t3 J; TspCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
7 I( g5 _! f4 \9 v5 espCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
; {( ]9 g9 ~* {' e. q* G; K3 y//然后退出草图：
spSketch->CloseEdition();

2 C. B1 ~: r$ N4 V' T" c2 A# ~* x
9 d/ c% N3 q( X) T2 }
5 m( U" N6 U# ]- s+ B7 O  h9 c9 e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,
NULL, Cst2DType_Vertical, 0, 0 );
//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
0 `# ?9 ^: L; C+ b6 F2 x//定义spLine4 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
% C2 G( u! k5 @. |: ONULL, Cst2DType_Vertical, 0, 0 );
1 n  X9 }" F3 ^- {4 i  m- u//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
" l$ R: `. \: n  c5 Z! G$ FNULL, Cst2DType_Length, 0, 0 );

//定义spLine2 与spLine4 的距离约束
# f# s* r) M7 t6 jspConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
NULL, Cst2DType_Distance, 0, 0 );
. h1 c! E) e! ~, I//定义spPt_bottom_left 与X 轴的距离约束
9 H" P0 h- ]2 A4 ]  g- ACATI2DAxis_var spSupport = NULL_var;
spSketch->GetAbsolute2DAxis(spSupport);
- d! f/ J3 W; t+ w! R/ A0 vspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
0 p% ?1 g2 z6 F6 C% B' W" N8 \spSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与Y 轴的距离约束
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
2 c& r6 B/ o) N3 o4 ?spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );

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