如何建立草图里面元素间的约束？

zsong22 · 发表于 2012-11-20 21:13:38

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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！