Catia二次开发源码分享：创建草图 Sketch，约束，曲线等

admin

有两种方式可以创建草图：
+ {& X1 `! }+ }" |& [1.通过参考平面创建
//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]));
+ d6 y  l% m& p1 }* W, q2 U2.通过原点和两个矢量方向
! \# n) n0 H7 i6 k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：
9 L' s7 h# g1 @$ Q  Vdouble pOrigin[3]={0,0,10};
double pH[3]={1,0,0};
double pV[3]={0,1,0};
4 \6 i; w, X1 t* j/ M- lCATISketchFactory_var spSketchFactory(spContainer);
: \$ Y! V* k# g% j3 m+ {CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
* p2 y' x" @" \2 b2 G9 Y

sp2DFactory(spSketch);
- X1 j. Z! ?, a! E& P# h# i  t//下面创建点
  I. ?7 i2 o& F( |$ L9 K% E; _CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
# |7 |# [. M8 Adouble pt_bottom_left[2] = {10, 10};
double pt_bottom_right[2] = {50, 10};
double pt_top_right[2] = {50, 50};
3 J$ W) \7 Z9 z+ ^* P6 Idouble pt_top_left[2] = {10, 50};
2 }0 {0 |; D8 l2 Z4 KspPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
spPt_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);
6 m1 `  J0 u* _+ \) LspLine3 = 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

% {2 D" ]5 j8 n; u5 M& g0 `& g: mCATI2DCurve_var spCurve1 (spLine1);
CATI2DCurve_var spCurve2 (spLine2);
5 f! B! G( u1 ]2 v5 XCATI2DCurve_var spCurve3 (spLine3);
+ H/ B9 a) C4 }CATI2DCurve_var spCurve4 (spLine4);
: }/ ]2 n: n: J4 JspCurve1->SetStartPoint(spPt_bottom_left);
, W  X6 v/ A% ?9 p4 LspCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
spCurve3->SetStartPoint(spPt_top_right);
spCurve3->SetEndPoint(spPt_top_left);
# S- U% `6 X4 RspCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
//然后退出草图：
- ^9 v7 E0 q& @9 X% [  rspSketch->CloseEdition();

/ ]5 g; I5 @% G# K; ]& q3 v/ P

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 );
: b/ \' w. P8 z3 d3 I2 e//定义spLine2 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
& ^2 V; t- O& @3 m7 S& c6 P" qNULL, Cst2DType_Vertical, 0, 0 );
//定义spLine3 为水平约束
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
9 v: G) f! R# |NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
7 P( U6 U3 q. G9 B  D4 J# ispConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
//定义spLine2 的长度约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Length, 0, 0 );

//定义spLine2 与spLine4 的距离约束
spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL,
4 t( ^; K3 o# W! tNULL, 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);
" n0 O! y" I2 r: }6 EspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
% ^0 V) z4 A( p0 a2 jspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
) C* L  B1 A# T" [" Y/ t, e//定义spPt_bottom_left 与Y 轴的距离约束
spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
6 J5 R9 E% q" O6 s. X% [spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
0 y9 X7 D4 F! i1 P7 n3 |: V; t7 U
6 K6 ~, [/ w# x8 t1 h' w; w6 F