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：
) T+ T4 _# s; |$ J* |5 c7 C1.通过参考平面创建
) w3 B3 K/ p+ ]- r//获得参考平面
CATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
) C: Z% u: c! g. ?2 k0 t//初始化草图工厂
; a! ^2 V7 y1 ~CATISkeTChFactory_var spSketchFactory(spContainer);
//在XY plane 上创建草图
$ B; ^" Z0 B8 J% J* [, A. s3 YCATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
. X  _; D) U8 ~6 d8 ?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。
1 g: o) k) S# g. y定义原点和方向：
double pOrigin[3]={0,0,10};
9 ]  q+ k3 t' ]* `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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sp2DFactory(spSketch);
//下面创建点
7 f2 q% x8 n' JCATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
9 U" a/ a5 \1 w/ D! Kdouble pt_bottom_left[2] = {10, 10};
5 |; X$ u$ T0 A( g' f4 c) Tdouble pt_bottom_right[2] = {50, 10};
double pt_top_right[2] = {50, 50};
double pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
2 I1 |$ G9 m# xspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
# Y8 }. t- Q3 v0 M1 B8 e/ f" RspPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
+ u4 I7 d/ M) l$ W: V( ospPt_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);
/ ~# l7 @3 y/ e6 WspLine2 = 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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3 c- {% l+ ]9 G' Z5 yCATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
$ Z3 t5 g* d& ?# tCATI2DCurve_var spCurve3 (spLine3);
% r% _, K, {" @) g. PCATI2DCurve_var spCurve4 (spLine4);
spCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
" j: H! E5 \' t6 t! n( R$ `: n2 OspCurve2->SetStartPoint(spPt_bottom_right);
8 G6 `* r4 U0 {spCurve2->SetEndPoint(spPt_top_right);
* M: O( _; R& \6 j5 o) ispCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
' @9 M4 U. w2 OspCurve4->SetEndPoint(spPt_bottom_left);
+ z. b8 Q3 t8 F' Q$ C, Z//然后退出草图：
spSketch->CloseEdition();
) _4 R2 z% }* h# Z


创建草图约束
8 i0 s5 s% ^1 F* {$ A3 m, t5 XCATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
& y1 x4 P: v( v//定义spLine1 为水平约束
, w7 H# ~+ g5 p: a$ y2 fspConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
4 T+ j' h4 c7 N& w! _//定义spLine2 为垂直约束
3 [* C! m1 n1 FspConstraint2DFactory->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,
6 z2 q" y7 O! F; y3 fNULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
  L) ?' S" Q9 l3 C( ?: w, HNULL, Cst2DType_Vertical, 0, 0 );
//定义spLine2 的长度约束
0 c) K+ t/ H( Q* J* ]1 \spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
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,
5 r8 C" k6 R: w% c" d/ D! fNULL, Cst2DType_Distance, 0, 0 );
1 b. |0 r: ]$ \- l//定义spPt_bottom_left 与X 轴的距离约束
CATI2DAxis_var spSupport = NULL_var;
spSketch->GetAbsolute2DAxis(spSupport);
" m( |& O7 C0 yspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
+ A" P4 m5 f# TspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
% e' f. [0 x, O//定义spPt_bottom_left 与Y 轴的距离约束
  j7 _' B. l9 N) n4 @6 QspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
/ Q% [$ Z* I' z9 z/ gspSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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