基于Rhino的三维鞋业CAD软件开发[

                            RHINO三维图形开发平台

                                     [7]

 

// 自定义曲线分段

CRhinoCommand::result CCommandmyChangeSeam::RunCommand( const CRhinoCommandContext& context )
{
 for(;;) {
  
  CRhinoDoc *doc = RhinoApp().ActiveDoc();
  CRhinoGetObject get;
  
  if(get.GetObjects(1,0) != CRhinoGetObject::object)
   return CRhinoCommand::cancel;
  
  CRhinoObjRef ōbjref = get.Object(0);
  
  const ON_Curve *crv = ON_Curve::Cast(objref.Geometry());

  objref = get.Object(1);
  
  const ON_Point *pt = ON_Point::Cast(objref.Geometry());
  
  ON_NurbsCurve  nurbcrv;
  
  crv->GetNurbForm(nurbcrv);
  
  ON_3dPoint point = *pt;
  
  double t;
  
  if(crv->GetClosestPoint(point,&t) == FALSE)
       break;

  if(changeseam(nurbcrv,t) == FALSE)
    break;
   
  objref = get.Object(0);

  doc->ReplaceObject(objref,nurbcrv);

        doc->Redraw();

  break;
 }
 
 return CRhinoCommand::success;
}

 

BOOL CCommandmyChangeSeam::changeseam(ON_NurbsCurve &crv, double t)
{
   BOOL rc = crv.IsClosed();

 if (rc == TRUE)
 {
  const ON_Interval old_dom = crv.Domain();

  if(t == old_dom.m_t[0] || t == old_dom.m_t[1])
   return rc;

  if(old_dom.Includes(t))
  {
   ON_NurbsCurve left,right;

   left=crv;

   right=crv;

   if(right.Trim(ON_Interval(t,old_dom.m_t[1]))==FALSE)
   {
    return FALSE;
   }

   if(left.Trim(ON_Interval(old_dom.m_t[0],t))==FALSE)
   {
    return FALSE;
   }

   crv=right;

   crv.Append(left);

   crv.SetDomain(t,t+old_dom.Length());

   return TRUE;
  }

  else
  {
   return FALSE;
  }

 }

 else
 {
  return FALSE;
 }

}

//
// END myChangeSeam command