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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static void do_UGopen_api(void)
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" K: g! F3 C* k, P  double pt1[3] = {0.0, 0.0, 0.0};
. c: Z  T2 M4 a9 [8 j- H# y' K  double pt2[3] = {2.0, 2.0, 2.0};
! [; C% j9 ?2 q* Z9 O% ?  double pt3[3] = {-2.0,-2.0,-2.0};
- v6 w* a+ _8 T/ u2 p% R) T1 G  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);
+ o, ~* J7 A- p3 |   /* Example to draw the vector with the base of its staff
      anchored at the origin so that the vector appears to point
/ C: P. e* L0 h) H      away from the origin
   */
8 J* B, n% I5 `3 Y# u6 f/ F+ a; _' g' e  UF_DISP_conehead(UF_DISP_ALL_ACTIVE_VIEWS,
                   pt2, vect1, 0);
  UF_DISP_labeled_conehead(UF_DISP_ALL_ACTIVE_VIEWS,
                           pt3, vect1, 0, "Normal");
  UF_DISP_get_conehead_attrb(&attrb);
  /* Use color index three */
  attrb.color = 3;
. v0 J! E0 \1 a* S  /* Update the current attribute settings */
  UF_DISP_set_conehead_attrb(&attrb);
, W( W9 W; c% ~9 o  printf("\nCurrent conhead display settings:\n");
  printf("\tLength of Staff: %g\n", attrb.staff_length);
  printf("\tTotal Length: %g\n", attrb.total_length);
/ `1 j4 p9 i: B1 {' c- t  printf("\tRadius of Cone Base: %g\n", attrb.cone_radius);
# l9 m: K: _9 O" q# S4 X  printf("\TColor Index: %d\n", attrb.color);
. r/ I4 C7 C* A% E3 d$ D  printf("\tFont Index: %d\n", attrb.font);
  printf("\tDensity Index: %d\n", attrb.density);
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