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标题: 通过点创建样条曲线 [打印本页]

作者: yxjizyh 时间: 2008-5-15 10:51
标题: 通过点创建样条曲线
/* B-spline parameters  */
         int degree = 3;
         int periodicity = 0;
         int num_points = NUMBER_POINTS;

         /* Point/slope UFCurve attribute array */
         UFCurve.PtSlopeCrvatr[] point_data = new UFCurve.PtSlopeCrvatr[NUMBER_POINTS];

         /* Arrays of user's defining point data */
         double[] parameters={0.00,  0.17,  0.32,  0.45, 1.23};
         double[] points = {1.1000,  0.5320,  2.0000,
                              1.5240,  0.6789,  2.3000,
                              2.0000,  0.9000,  3.5956,
                              2.3456,  1.3456,  3.7890,
                              3.1000,  2.4567,  3.3214};
         int[] slopeTypes = { UF_CURVE_SLOPE_DIR,
                                 UF_CURVE_SLOPE_AUTO,
                                 UF_CURVE_SLOPE_NONE,
                                 UF_CURVE_SLOPE_DIR,
                                 UF_CURVE_SLOPE_VEC};
         double[] slopeVecs = {1.2300,  5.0506,  4.0360,
                                 0.0000,  0.0000,  0.0000,
                                 0.0000,  0.0000,  0.0000,
                                 0.5000,  1.0000,  0.5000,
                                 1.0000, -2.0000,  1.0000};
         int[] crvatrTypes = {UF_CURVE_CRVATR_NONE,
                                 UF_CURVE_CRVATR_AUTO_DIR,
                                 UF_CURVE_CRVATR_NONE,
                                 UF_CURVE_CRVATR_VEC,
                                 UF_CURVE_CRVATR_VEC};
         double[] crvatrVecs = {0.0000,  0.0000,  0.0000,
                                    1.0000,  2.5780,  5.6700,
                                    0.0000,  0.0000,  0.0000,
                                    1.0000,  -1.0000,  1.0000,
                                    -1.0000,  -1.0000,  -1.0000};
         int i, save_def_data = 1;

         Tag spline_tag;
         for (i= 0; i<NUMBER_POINTS; i++)
         {
            point_data.point= new double[3];
            point_data.point[0] = points[3*i];
            point_data.point[1] = points[3*i+1];
            point_data.point[2] = points[3*i+2];
            point_data.slope_type = slopeTypes;
            point_data.slope= new double[3];
            point_data.slope[0] = slopeVecs[3*i];
            point_data.slope[1] = slopeVecs[3*i+1];
            point_data.slope[2] = slopeVecs[3*i+2];
            point_data.crvatr_type = crvatrTypes;
            point_data.crvatr= new double[3];
            point_data.crvatr[0] = crvatrVecs[3*i];
            point_data.crvatr[1] = crvatrVecs[3*i+1];
            point_data.crvatr[2] = crvatrVecs[3*i+2];
         }
         /* Create B-spline UFCurve */
         theUfSession.Curve.CreateSplineThruPts(degree,
            periodicity,
            num_points,
            point_data,
            parameters,
            save_def_data,
            out spline_tag);
         theUfSession.Part.Save();
         return 0;
      }
      public static void Main(string[] args)
      {
         theSession=Session.GetSession();
         theUfSession= UFSession.GetUFSession();

         fs = new FileStream("EX_Curve_CreateSplineThruPts.log", FileMode.Create, FileAccess.Write);
         w = new StreamWriter(fs); // create a stream writer
         w.Write("Log Entry : \r\n");
         w.WriteLine("--Log entry goes here--");
         w.Flush(); // update underlying file

   if ( File.Exists("EX_Curve_CreateSplineThruPts.prt") )
   {
      w.WriteLine("Remove EX_Curve_CreateSplineThruPts.prt file from &ltroject Folder>\\bin\\Debug !!");
      w.WriteLine("EX_Curve_CreateSplineThruPts.prt already exists. !!");
      w.Close();
      return;
   }

         try
         {
            EX_Curve_CreateSplineThruPts curveTest1 = new EX_Curve_CreateSplineThruPts();
            if (curveTest1.Execute()==0)
            {
                  w.WriteLine("Successful");
            }
            else
            {
                  w.WriteLine("Failed");
            }
         }
         catch(NXException e)
         {
            w.WriteLine("Exception is: {0}", e.Message);
         }
         w.WriteLine("End of Log File");
         w.Close();
      }
public static int GetUnloadOption(string dummy)
{
   return UFConstants.UF_UNLOAD_IMMEDIATELY;
}
  }
}

请问这里的
double[] slopeVecs = {1.2300,  5.0506,  4.0360,
                                 0.0000,  0.0000,  0.0000,
                                 0.0000,  0.0000,  0.0000,
                                 0.5000,  1.0000,  0.5000,
                                 1.0000, -2.0000,  1.0000};和
         double[] crvatrVecs = {0.0000,  0.0000,  0.0000,
                                    1.0000,  2.5780,  5.6700,
                                    0.0000,  0.0000,  0.0000,
                                    1.0000,  -1.0000,  1.0000,
                                    -1.0000,  -1.0000,  -1.0000};
数组中的具体值应该怎样确定的, 和数组double[] crvatrVecs是什么意思?
请各位帮忙，谢谢了！

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