UGNX二次开发源码分享：关于显示UG NX临时箭头功能

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这功能其实很好用，比如选择面，自动显示面的法线等等。
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" D% y, D3 v# z& S) gstatic void do_UGopen_api(void)
! a, F' h& x! \+ A2 k* c& n3 S0 s{
7 f& {2 F- m2 W9 u  double pt1[3] = {0.0, 0.0, 0.0};
  double pt2[3] = {2.0, 2.0, 2.0};
  double pt3[3] = {-2.0,-2.0,-2.0};
  double vect1[3] = {1.0, 1.0, 1.0};
  UF_DISP_conehead_attrb_s attrb;
  UF_DISP_conehead(UF_DISP_ALL_ACTIVE_VIEWS,
                   pt1, vect1, 1);
! S! s3 U9 y3 L* [. o$ N9 U1 ]% @   /* Example to draw the vector with the base of its staff
      anchored at the origin so that the vector appears to point
      away from the origin
   */
. q" h0 u% K/ u! r# K  UF_DISP_conehead(UF_DISP_ALL_ACTIVE_VIEWS,
                   pt2, vect1, 0);
  UF_DISP_labeled_conehead(UF_DISP_ALL_ACTIVE_VIEWS,
1 e0 G0 a! l' ~                           pt3, vect1, 0, "Normal");
/ A0 ^9 d! U1 ?  Z- K7 [  ]! _  UF_DISP_get_conehead_attrb(&attrb);
  /* Use color index three */
, z# H9 k; B1 b- _5 H2 A7 F  attrb.color = 3;
  /* Update the current attribute settings */
  UF_DISP_set_conehead_attrb(&attrb);
  {, W- O' B- s8 Q  printf("\nCurrent conhead display settings:\n");
+ X' T. T2 ]+ N! d/ I  printf("\tLength of Staff: %g\n", attrb.staff_length);
  printf("\tTotal Length: %g\n", attrb.total_length);
  printf("\tRadius of Cone Base: %g\n", attrb.cone_radius);
  printf("\TColor Index: %d\n", attrb.color);
& k  h- `" |+ A0 b9 u2 O  printf("\tFont Index: %d\n", attrb.font);
& {; O. \! N& y  [  printf("\tDensity Index: %d\n", attrb.density);
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