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。

static void do_UGopen_api(void)
{
  double pt1[3] = {0.0, 0.0, 0.0};
9 b# w2 S/ D3 F  \: {  double pt2[3] = {2.0, 2.0, 2.0};
2 _8 N6 w) P' e  double pt3[3] = {-2.0,-2.0,-2.0};
* Q" H/ O3 E; U9 ?  double vect1[3] = {1.0, 1.0, 1.0};
& }" _; ?7 K3 K. k& K$ m% c  UF_DISP_conehead_attrb_s attrb;
  UF_DISP_conehead(UF_DISP_ALL_ACTIVE_VIEWS,
& L, S5 ?; o0 r3 X                   pt1, vect1, 1);
( [; O) s' y/ M8 n' J2 I   /* Example to draw the vector with the base of its staff
4 k1 G- g. M$ ~0 R3 r/ w      anchored at the origin so that the vector appears to point
5 h% \& f+ n# L/ d: b      away from the origin
- f& ^% U$ _% k$ |8 M( \# ]& O   */
. S" |. W6 b, i: |8 S' ]  UF_DISP_conehead(UF_DISP_ALL_ACTIVE_VIEWS,
* D& P! n" z" y# e/ A0 A$ D7 D                   pt2, vect1, 0);
5 k( j5 C5 @* u: S$ }  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;
) h& D+ V/ k( D1 l3 N! W: S& @  /* Update the current attribute settings */
7 F. ?) h& W3 r  UF_DISP_set_conehead_attrb(&attrb);
  z, B" S4 v6 Y  printf("\nCurrent conhead display settings:\n");
; \1 Y# K1 p& \0 c  printf("\tLength of Staff: %g\n", attrb.staff_length);
0 b# n/ \7 ?8 \/ E  printf("\tTotal Length: %g\n", attrb.total_length);
* x0 U* N& u2 I& k* v! i  printf("\tRadius of Cone Base: %g\n", attrb.cone_radius);
" H8 D- S1 q1 S  printf("\TColor Index: %d\n", attrb.color);
  printf("\tFont Index: %d\n", attrb.font);
  printf("\tDensity Index: %d\n", attrb.density);
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