GEANT321/gdraw/gdarr.F

   1 *
   2 * $Id$
   3 *
   4 * $Log$
   5 * Revision 1.1.1.1  1995/10/24 10:20:20  cernlib
   6 * Geant
   7 *
   8 *
   9 #include "geant321/pilot.h"
  10 *CMZ :  3.21/02 29/03/94  15.41.25  by  S.Giani
  11 *-- Author :
  12       SUBROUTINE GDARR(X1,Y1,X2,Y2,SIZE,ITEXT)
  13 C.
  14 C.    ******************************************************************
  15 C.    *                                                                *
  16 C.    *       Draw a segment from (X1,Y1) to (X2,Y2)                   *
  17 C.    *       and an arrow (of size SIZE) at the ending point (X2,Y2)  *
  18 C.    *       together with the one-character text ITEXT               *
  19 C.    *                                                                *
  20 C.    *    ==>Called by : GDAXIS                                       *
  21 C.    *       Author : P.Zanarini   *********                          *
  22 C.    *                                                                *
  23 C.    ******************************************************************
  24 C.
  25       DIMENSION U(3),V(3)
  26       CHARACTER*(*) ITEXT
  27       SAVE TGAR
  28       DATA TGAR/0.6/
  29 C.
  30 C.    ------------------------------------------------------------------
  31 C.
  32       U(1)=X1
  33       U(2)=X2
  34       V(1)=Y1
  35       V(2)=Y2
  36       XL=SQRT((X2-X1)**2+(Y2-Y1)**2)
  37 C
  38 C             If axis size is too small, then return without drawing it
  39 C
  40       IF (XL.LE.0.1) GO TO 999
  41 C
  42 C             Draw the segment
  43 C
  44       CALL GDRAWV(U,V,2)
  45 C
  46       FSIN=(Y2-Y1)/XL
  47       FCOS=(X2-X1)/XL
  48       U(1)=X1+(XL-SIZE)*FCOS-SIZE*TGAR*FSIN
  49       U(3)=X1+(XL-SIZE)*FCOS+SIZE*TGAR*FSIN
  50       V(1)=Y1+(XL-SIZE)*FSIN+SIZE*TGAR*FCOS
  51       V(3)=Y1+(XL-SIZE)*FSIN-SIZE*TGAR*FCOS
  52       U(2)=X2
  53       V(2)=Y2
  54 C
  55 C             Draw the arrow
  56 C
  57       CALL GDRAWV(U,V,3)
  58 C
  59       X0=X1+(XL+2*SIZE)*FCOS
  60       Y0=Y1+(XL+2*SIZE)*FSIN
  61       ANGLE=0.0
  62       LWIDTH=1
  63       IOPT=0
  64 C
  65 C             Draw the text
  66 C
  67       CALL GDRAWT(X0,Y0,ITEXT,SIZE,ANGLE,LWIDTH,IOPT)
  68 C
  69   999 RETURN
  70       END