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：
4 v  Y+ p7 ?' c6 w* O1.通过参考平面创建
//获得参考平面
CATLISTV(CATISpecObject_var) spRefPlanes = spPart->GetReferencePlanes();
4 {1 e, q2 v7 H; @! S  S, ~//初始化草图工厂
CATISkeTChFactory_var spSketchFactory(spContainer);
//在XY plane 上创建草图
% Z0 I7 T7 Z5 l; \. J: PCATISketch_var spSketch = spSketchFactory->CreateSketch(spRefPlanes[1]));
+ w: n; u; t0 D; J+ _7 d2.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。
7 E7 u6 ?2 r5 e6 ~' P定义原点和方向：
* J0 n. Z0 \: X& Ndouble pOrigin[3]={0,0,10};
double pH[3]={1,0,0};
double pV[3]={0,1,0};
5 w8 `/ X6 r8 G" i7 A% GCATISketchFactory_var spSketchFactory(spContainer);
CATISketch_var spSketch = spSketchFactory->CreateSketch(pOrigin, pH, pV);
% {' r1 D; k1 c: ]5 y

sp2DFactory(spSketch);
//下面创建点
CATI2DPoint_var spPt_bottom_left, spPt_bottom_right, spPt_top_right, spPt_top_left;
double pt_bottom_left[2] = {10, 10};
9 _% F9 h% B) I  C& i3 g0 xdouble pt_bottom_right[2] = {50, 10};
8 Z. i4 q4 U% B8 o+ h) S& L+ S, edouble pt_top_right[2] = {50, 50};
: b9 C. ^8 g6 u  qdouble pt_top_left[2] = {10, 50};
$ A+ G' k9 U. r- \spPt_bottom_left = sketch2DFactory->CreatePoint(pt_bottom_left);
spPt_bottom_right = sketch2DFactory->CreatePoint(pt_bottom_right);
spPt_top_right = sketch2DFactory->CreatePoint(pt_top_right);
. x8 s1 w/ Y4 HspPt_top_left = sketch2DFactory->CreatePoint(pt_top_left);
2 u" V" _- k4 w0 i+ m5 I+ H, M# z//开始创建线
  Q6 s; ?1 R+ M9 z: VCATI2DLine_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 d- D1 \3 g$ \CATI2DCurve_var spCurve3 (spLine3);
CATI2DCurve_var spCurve4 (spLine4);
/ f( }% X5 X" |* UspCurve1->SetStartPoint(spPt_bottom_left);
spCurve1->SetEndPoint(spPt_bottom_right);
spCurve2->SetStartPoint(spPt_bottom_right);
spCurve2->SetEndPoint(spPt_top_right);
7 A, V8 o% C: {  _' E- vspCurve3->SetStartPoint(spPt_top_right);
% d! H0 L$ \, t5 G' w& dspCurve3->SetEndPoint(spPt_top_left);
spCurve4->SetStartPoint(spPt_top_left);
spCurve4->SetEndPoint(spPt_bottom_left);
& T! C  u+ L+ X1 X4 J//然后退出草图：
spSketch->CloseEdition();

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4 f3 }# p9 F- }$ w+ _5 V创建草图约束
CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
//定义spLine1 为水平约束
3 B  J' I" ?/ y& y) CspConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine2 为垂直约束
6 @1 {- E1 v* v1 T' Q0 E9 ospConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL,
1 }) |& M, |, B% C. W5 A5 uNULL, Cst2DType_Vertical, 0, 0 );
3 M4 H8 r! L6 l, s//定义spLine3 为水平约束
! R  [6 B# k. X/ {9 c( H+ r4 n5 FspConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL,
. e6 r. S6 w; k$ A, c' p2 KNULL, Cst2DType_Horizontal, 0, 0 );
//定义spLine4 为垂直约束
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL,
NULL, Cst2DType_Vertical, 0, 0 );
# Q# G# r! c4 v, _! }4 d6 c+ L/ o//定义spLine2 的长度约束
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,
7 u" T8 W0 `, A" H) c& E5 U' P& E; DNULL, Cst2DType_Distance, 0, 0 );
//定义spPt_bottom_left 与X 轴的距离约束
9 {$ J/ N2 a& y  N" }) T5 ECATI2DAxis_var spSupport = NULL_var;
spSketch->GetAbsolute2DAxis(spSupport);
9 m* }4 O8 @  _: G5 WspConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
0 S$ s4 p( p) ZspSupport->GetHDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
  C7 T' R! |  r# U0 n1 w//定义spPt_bottom_left 与Y 轴的距离约束
+ I4 M. @/ i7 d& Y2 Y& \3 \spConstraint2DFactory->CreateConstraint( spPt_bottom_left, NULL,
- J* }' ~# ^5 g$ T1 f0 z& ]spSupport->GetVDirection(), NULL, NULL, NULL, NULL,Cst2DType_Distance, 0, 0 );
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