C @(#)radcnv.for	17.1.1.1 (ES0-DMD) 01/25/02 17:19:21
C===========================================================================
C Copyright (C) 1995 European Southern Observatory (ESO)
C
C This program is free software; you can redistribute it and/or 
C modify it under the terms of the GNU General Public License as 
C published by the Free Software Foundation; either version 2 of 
C the License, or (at your option) any later version.
C
C This program is distributed in the hope that it will be useful,
C but WITHOUT ANY WARRANTY; without even the implied warranty of
C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
C GNU General Public License for more details.
C
C You should have received a copy of the GNU General Public 
C License along with this program; if not, write to the Free 
C Software Foundation, Inc., 675 Massachusetss Ave, Cambridge, 
C MA 02139, USA.
C
C Corresponding concerning ESO-MIDAS should be addressed as follows:
C	Internet e-mail: midas@eso.org
C	Postal address: European Southern Observatory
C			Data Management Division 
C			Karl-Schwarzschild-Strasse 2
C			D 85748 Garching bei Muenchen 
C			GERMANY
C===========================================================================
C
      PROGRAM RADCNV
C 
C +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
C.COPYRIGHT:      Copyright (c) 1987 European Southern Observatory,
C                                         all rights reserved
C.IDENTIFICATION: RADCNV
C.PURPOSE:        compute the size of an aperture in screen coordinates
C.AUTHOR:         Ch. Ounnas                  ESO - Garching
C.LANGUAGE:       F77+ESO      ext
C.KEYWORDS:       DEANZA display
C.ALGORITHM:      use the keywords DEANZA,DAZMEMI nad the routine PIXCNV
C.INPUT/OUTPUT:   the procedure file should contain:
C                 INPUTR/R/1/1                 radius of the aperture
C                 AP/I/1/4   local keyword to store screen pixels
C.VERSION:        2.6 upgrade to mod. DeAnza stuff (1K memory, 512 display...)
C.VERSION:        871216  RHW  ESO-FORTRAN Conversion
C.VERSION:        900319  put into real ST interfaces and close image display 
C			  correctly  KB
C -------------------------------------------------------------------
C 
      IMPLICIT    NONE
C
      INTEGER     MADRID
      INTEGER     XY(4),KUNI(1),KNUL,IMNO
      INTEGER     STAT,IAV,IMA
C
      CHARACTER   FRAME*60
C
      REAL        RINF(6),PIXEL1(6),PIXEL2(6),RS
      REAL        RAYON
C
      DOUBLE PRECISION  START(2)
C
      INCLUDE     'MID_INCLUDE:ST_DEF.INC'
C
      COMMON /VMR/MADRID(1)
C
      INCLUDE     'MID_INCLUDE:IDIMEM.INC/NOLIST'
      INCLUDE     'MID_INCLUDE:IDIDEV.INC/NOLIST'
C
      INCLUDE     'MID_INCLUDE:ST_DAT.INC'
C
C ***
C
      CALL STSPRO('RADCNV')                          !get into MIDAS environment
      CALL DTOPEN(1,STAT)                            !open image display
C
C *** get the radius of the aperture in user unit
      CALL STKRDR('INPUTR',1,1,IAV,RAYON,KUNI,KNUL,STAT)
C
      CALL DTGICH(QDSPNO,QIMCH,FRAME,RINF,STAT)
      IF (SOURCE.NE.1) THEN                          !no image loaded...
         CALL STETER(1,'RADCNV: No image loaded - we abort... ')
      ELSE
         IMA = 1
         IF (RAYON.EQ.-1.) GO TO 20
      END IF
C
C *** get necessary descriptors of frame
      CALL STFOPN(FRAME,D_OLD_FORMAT,0,F_IMA_TYPE,IMNO,STAT)
      CALL STDRDD(IMNO,'START',1,2,IAV,START,KUNI,KNUL,STAT)
      CALL PIXXCV('INIT',IMNO,RINF,STAT)
C
C *** now convert world coordinates to screen pixels
      PIXEL1(1) = START(1)
      PIXEL1(2) = START(2)
      CALL PIXXCV('WRS',0,PIXEL1,STAT)
      IF (START(2).GT.0.) THEN
         PIXEL2(1) = PIXEL1(1) + RAYON
      ELSE
         PIXEL2(1) = PIXEL1(1) - RAYON
      END IF
      PIXEL2(2) = START(2)
      CALL PIXXCV('WRS',0,PIXEL2,STAT)
      RS = ABS(PIXEL2(5)-PIXEL1(5))
      XY(1) = 200
      XY(2) = 200
      XY(3) = 200 + IFIX(2.*RS) + 1
      XY(4) = 200 + IFIX(2.*RS) + 1
      CALL STKWRI('AP',XY,1,4,KUNI,STAT)
C
20    CALL STKWRI('IMA',IMA,1,1,KUNI,STAT)
C 
      CALL DAZCLO(QDSPNO)
      CALL STSEPI
      END