NX二开ufun函数UF_MODL_ask_curve_points(获取曲线信息)

根据曲线tag，返回曲线相关信息：弦宽容、弧度、最大步长、点数组的点。

实例返回结果截图如下：

实例创建曲线截图如下：

 

1、函数结构

int UF_MODL_ask_curve_points 
（tag_t curve_id，
double ctol，
double atol，
double stol，
int * numpts，
double * * pts）

2、实例源码

/*

The following example uses a semi-circle as the input curve. The ctol
and stol parameters were chosen so that five coordinates (located at 0,
45, 90, 135, and 180 degrees on the arc) are outputted.

*/

#include 
#include 
#include 
#include 
#include 
#include 
#define UF_CALL(X) (report( __FILE__, __LINE__, #X, (X)))
static int report( char *file, int line, char *call, int irc)
{
  if (irc)
  {
     char    messg[133];
     printf("%s, line %d:  %s\n", file, line, call);
     (UF_get_fail_message(irc, messg)) ?
       printf("    returned a %d\n", irc) :
       printf("    returned error %d:  %s\n", irc, messg);
  }
  return(irc);
}
static void do_ugopen_api(void)
{
  double ctol = 0.07612046748871;
  double atol = 0.0;
  double stol = 0.76536686473018;
  double *pts;

  int numpts, i;
  tag_t arc, wcs_tag;
  UF_CURVE_arc_t arc_coords;
  UF_CALL(UF_CSYS_ask_wcs(&wcs_tag));
  UF_CALL(UF_CSYS_ask_matrix_of_object(wcs_tag,
                                       &arc_coords.matrix_tag));
  arc_coords.start_angle = 0.0;
  arc_coords.end_angle = PI;
  arc_coords.arc_center[0] = 0.0;
  arc_coords.arc_center[1] = 0.0;
  arc_coords.arc_center[2] = 0.0;
  arc_coords.radius = 1.0;

  UF_CALL(UF_CURVE_create_arc(&arc_coords, &arc));
  if(UF_CALL(UF_MODL_ask_curve_points(arc,ctol,atol,stol,
                                 &numpts, &pts)))
  {
    /* Print the error message from UF_CALL macro */
  }
  else
  {
    printf("The number of points are: %d\n",numpts);
    for(i = 0; i < 3 * numpts; i++)
    printf("The points are: %f\n",pts[i]);

  }
  UF_free(pts);
}
/*ARGSUSED*/
void ufusr(char *param, int *retcode, int param_len)
{
  if (!UF_CALL(UF_initialize()))
  {
    do_ugopen_api();
    UF_CALL(UF_terminate());
  }
}
int ufusr_ask_unload(void)
{
  return (UF_UNLOAD_IMMEDIATELY);
}

1、创建曲线UF_CURVE_create_arc

2、获取曲线信息UF_MODL_ask_curve_points