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：
# q0 u8 N. U/ I2 e6 S: y1.通过参考平面创建
6 t$ H& o3 G' N; A0 E) r: m! n//获得参考平面
CATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
- X% T+ U5 a* z1 D8 K//初始化草图工厂
( Z- H0 V6 V4 n3 t4 D* Z- m% NCATISkeTChFactory_var spSketchFactory(spContainer);
//在XY plane 上创建草图
CATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
' s: n6 @) x: p% K5 I2.通过原点和两个矢量方向
8 `$ O# e* a, h% j7 ~# u) o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：
* y7 l1 H# C/ r/ _' |: m0 y9 I3 {double pOrigin[3]={0,0,10};
; Q4 T( }! _: q  r; A1 J3 }' \# zdouble pH[3]={1,0,0};
double pV[3]={0,1,0};
CATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);


sp2DFactory(spSketch);
//下面创建点
) D' q5 F0 i! ?/ t% ^2 |CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
double pt_bottom_left[2] = {10, 10};
+ L& M+ l7 z6 L7 Wdouble pt_bottom_right[2] = {50, 10};
double pt_top_right[2] = {50, 50};
. b3 @  i- M" ^; s# F. |' Y! I, f8 Ydouble pt_top_left[2] = {10, 50};
spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
# b# ^6 V* V" h" w* W; f- pspPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
: {8 o1 P4 O  g& t//开始创建线
8 j, t  H& E- eCATI2DLine_var spLine1, spLine2, spLine3, spLine4;
spLine1 = sketch2DFactory->CreateLine(pt_bottom_left,pt_bottom_right);
spLine2 = sketch2DFactory->CreateLine(pt_bottom_right,pt_top_right);
4 Q4 b: Y$ ?/ UspLine3 = sketch2DFactory->CreateLine(pt_top_right,pt_top_left);
6 {" E! b5 h2 i$ _spLine4 = sketch2DFactory->CreateLine(pt_top_left,pt_bottom_left);
//将线的首尾连接起来

$ d7 N, q1 L# g) `6 A% c2 s* f: FCATI2DCurve_var spCurve1 (spLine1);
9 }) {8 R. m+ T& JCATI2DCurve_var spCurve2 (spLine2);
6 V( k/ V" v7 v0 h1 a) Q6 \6 gCATI2DCurve_var spCurve3 (spLine3);
1 [& b! G; i6 q- P, _6 _' zCATI2DCurve_var spCurve4 (spLine4);
+ j( I# W! T! R3 ^spCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
) {: e% q! b. hspCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
+ I6 V! t7 e1 P5 K3 U: j& C3 IspCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
spSketch->CloseEdition();

# i0 H* g; ?. h3 R  l( q

创建草图约束
CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
. V( w/ c, Q, x9 m//定义spLine1 为水平约束
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
; M, }1 Y+ }8 C6 w( v# s2 q8 YNULL, 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
# B' k7 |" g! y  C  |- l3 ZspConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
$ t: d8 m" R. z4 oNULL, Cst2DType_Horizontal, 0, 0 );
: I) `6 P  U; F/ `  v5 t//定义spLine4 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
2 G* L2 m4 _- f# W0 ~//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Length, 0, 0 );
. N+ }/ D7 E7 `" F  e, R; W7 @
//定义spLine2 与spLine4 的距离约束
spConstraint2DFactory->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
4 P$ z# H& {% zCATI2DAxis_var spSupport = NULL_var;
* W% n1 R6 [" b! u" T  vspSketch->GetAbsolute2DAxis(spSupport);
spConstraint2DFactory->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
! N* T8 Z+ P: DspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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