如何建立草图里面元素间的约束？

CATI2DWFFactory_var spWF2DFactOnSketch(spSketch);
  // Creates the elements of the sketch
  double pt1[2] = {10., 5.},
         pt2[2] = {-10., 5.},
         pt3[2] = {-10., -5.},
         pt4[2] = {10., -5.};
  // Edits the sketch and draws the lines and the endpoints.
  spSketch->OpenEdition();
  CATISpecObject_var spLine1 = spWF2DFactOnSketch->CreateLine(pt1,pt2);
  CATISpecObject_var spLine2 = spWF2DFactOnSketch->CreateLine(pt2,pt3);
  CATISpecObject_var spLine3 = spWF2DFactOnSketch->CreateLine(pt3,pt4);
  CATISpecObject_var spLine4 = spWF2DFactOnSketch->CreateLine(pt4,pt1);
  CATISpecObject_var spCircle = spWF2DFactOnSketch->CreateCircle(pt4,50,0,3.14);

如上 我打算创建一个矩形框  并以Pt4为圆心创建圆弧 。但是，由于没有约束，这些线条与圆在草图中都是活动的，并没有固定下来。  
求帮助  谢谢！  

CATI2DConstraintFactory

CATI2DConstraintFactory_var spConstraint2DFactory(spSketch);
spConstraint2DFactory->CreateConstraint( spLine1, NULL, NULL, NULL, NULL, NULL, NULL,  Cst2DType_Horizontal, 0, 0 );
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL, NULL,  Cst2DType_Vertical, 0, 0 );  
spConstraint2DFactory->CreateConstraint( spLine3, NULL, NULL, NULL, NULL, NULL, NULL,Cst2DType_Horizontal, 0, 0 );  
spConstraint2DFactory->CreateConstraint( spLine4, NULL, NULL, NULL, NULL, NULL, NULL,  Cst2DType_Vertical, 0, 0 );
spConstraint2DFactory->CreateConstraint( spLine2, NULL, NULL, NULL, NULL, NULL, NULL, Cst2DType_Length, 0, 0 );
spConstraint2DFactory->CreateConstraint( spLine2, NULL, spLine4, NULL, NULL, NULL, NULL, Cst2DType_Distance, 0, 0 );

谢谢 丽丽！    在草图中 如何将一个创建的 CATI2DCurve  与CATI2DPoint   定义为相合呢？    或者两个CATI2DPoint  间定义为重合。

知道了  用Cst2DType_On 命令

zsong22 发表于 2012-11-21 10:24
知道了  用Cst2DType_On 命令

恩恩，根据需要创建的约束类型 设置参数CAT2DCstType