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标题: 【求助】各位老大，问个函数的用法 [打印本页]

作者: suye007 时间: 2004-7-2 16:13
标题: 【求助】各位老大，问个函数的用法
我想查询样条曲线的参数，在使用下面这个函数的时候竟然得不到结果，我想可能是parm这个参数赋值不正确，help上讲“The input curve parameter, parm, is normalized between 0 and 1.”，意思应该是在0~1之间取值吧，我随便给定parm一个0.5测试了一下，就是没有结果，想请教
UF_MODL_ask_curve_props ( )的用法。程序代码如下：
int CHANGE_action_0_act_cb ( int dialog_id,
            void * client_data,
            UF_STYLER_item_value_type_p_t callback_data)
{
   char cue[] = "Select the ideal surface";
   char title[] = "Slect by Class";
   int response, count;
   tag_p_t obj;
tag_t surface_tag;
//平面的参数
double  origin_point[ 3 ] ={0,0,30};
double  plane_normal[ 3 ] ={0,0,1};
tag_t plane_tag;
tag_t  section_curves_feature;
//surface的参数
tag_t  objects[1], planes[1];
   UF_CURVE_section_general_data_t  general_data;
   UF_CURVE_section_planes_data_t planes_data;
//curve的参数
//tag_t curve_id;
   double parm=0.5;
    double point[3];
    double tangent[3];
    double p_norm[3];
    double b_norm[3];
    double torsion;
    double rad_of_cur;

   /* Make sure User Function is available. */
   if ( UF_initialize() != 0)
         return ( UF_UI_CB_CONTINUE_DIALOG );

   /* ---- Enter your callback code here ----- */

   if(UF_UI_select_with_class_dialog(
         cue, title, UF_UI_SEL_SCOPE_WORK_PART,
         NULL, NULL, &response, &count, &obj) == 0)
   {

      if (response == UF_UI_OK)
      {
            objects[0]=surface_tag=obj[0];
            UF_free(obj);
            UF_MODL_create_plane(origin_point, plane_normal, [$plane_tag)]

            planes[0] = plane_tag;

            general_data.associate    = 1;
            general_data.objects    = objects;
            general_data.num_objects = 1;
            general_data.grouping    = 0;
            general_data.join_type    = 0;
            general_data.tolerance    = 0.001;

            planes_data.planes       = planes;
            planes_data.num_planes    = 1;

         UF_CURVE_section_from_planes (&general_data, &planes_data,
                  [$section_curves_feature)]

         UF_MODL_ask_curve_props (section_curves_feature, parm, point,
         tangent, p_norm, b_norm, &torsion,
          [$rad_of_cur )]
      }
   }

   UF_terminate ();

   /* Callback acknowledged, do not terminate dialog */
   return (UF_UI_CB_CONTINUE_DIALOG);

   /* or Callback acknowledged, terminate dialog. */
   /* return ( UF_UI_CB_EXIT_DIALOG );             */

}

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