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/* @(#)getfrm.c 19.1 (ESO-DMD) 02/25/03 13:56:34 */
/*===========================================================================
Copyright (C) 1995 European Southern Observatory (ESO)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 675 Massachusetts Ave, Cambridge,
MA 02139, USA.
Correspondence concerning ESO-MIDAS should be addressed as follows:
Internet e-mail: midas@eso.org
Postal address: European Southern Observatory
Data Management Division
Karl-Schwarzschild-Strasse 2
D 85748 Garching bei Muenchen
GERMANY
===========================================================================*/
/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
.COPYRIGHT (c) 1993 European Southern Observatory
.IDENTifer GETFRM
.AUTHOR R.M. van Hees IPG-ESO Garching
.KEYWORDS low level plot routine
.LANGUAGE C
.PURPOSE determine the size and position of the tickmarks along a axis
input: char *frame MANUal or AUTO scaling
in/output: float *wcfram [0] begin of axis in world coordinates
[1] end of the axis
[2] big tickmarks spacing
[3] small tickmarks spacing
.ALGORITHM - small tickmarks spacing >= 0.0
- big tickmarks spacing == 0.0
==> big tickmarks are calculated
- small tickmarks spacing == 0.0
==> small tickmarks are calculated
- small tickmarks spacing < 0.0
logaritmic scaling, big tickmarks are set to 1.0
- frame == "AUTO"
==> the length of the axis is enlarged by one small tickmark
at both sides
.COMMENTS none
.ENVIRONment MIDAS
#include <midas_def.h> Prototypes for MIDAS interfaces
#include <plot_def.h> Symbols used by the PLT interfaces
.VERSION 1.1 20-Sep-1993 FORTRAN --> ANSI-C RvH
010423 last mdofi
------------------------------------------------------------*/
/*
* Define _POSIX_SOURCE to indicate
* that this is a POSIX program
*/
#define _POSIX_SOURCE 1
/*
* definition of the used functions in this module
*/
#include <string.h>
#include <math.h>
/*
* define some macros and constants
*/
#include <midas_def.h>
#include <plot_def.h>
#ifndef MINFLOAT
#define MINFLOAT (float) PLT_EPS
#endif
/*
* here start the code of the function
*/
void GETFRM( frame, wcfram )
char *frame;
float *wcfram;
{
int nsmall, nlabel, num;
double amin, amax, abig, asmall, diff, amant, step, iexp;
/*
* the constants used
*/
char *errmess = "*** WARNING: axis start value = end value range adjusted";
/*
* for the reader of the code...
*/
amin = *wcfram;
amax = *(wcfram+1);
abig = *(wcfram+2);
asmall = *(wcfram+3);
/*
* we nicely give alternative values, although the input is flat
*/
if ( fabs ( amax - amin ) < PLT_EPS )
{ SCTPUT( errmess );
if ( fabs( amin ) < PLT_EPS ) /*around zero -0.5 --> 0.5 */
{ amin = -0.5;
amax = 0.5;
}
else /*around an other value */
{ amin -= 0.5 * fabs( amin );
amax += 0.5 * fabs( amax );
}
}
if ( *(wcfram+3) > - MINFLOAT )
{ nsmall = 5; /*number of small tickmarks between a big tickmark*/
nlabel = 4;
diff = log10( fabs( amax - amin )/ nlabel );
iexp = floor (diff);
amant = diff - iexp;
if ( amant < 0.15 )
num = 1;
else if ( amant < 0.5 )
{ num = 2;
nsmall = 4;
}
else if ( amant < 0.85 )
num = 5;
else
num = 10;
step = num * pow( 10.0, iexp );
if ( fabs( abig ) < PLT_EPS ) abig = fabs( step );
if ( fabs( asmall ) < PLT_EPS ) asmall = abig / nsmall;
}
else
abig = MYMAX( abig, 1.0 );
if (strncmp( frame, "AUTO", 4 ) == 0 || strncmp( frame, "auto", 4 ) == 0)
{ if ( amax < amin )
{ if ( (float) asmall > - MINFLOAT )
{ amin += asmall;
amax -= asmall;
}
else
{ amin = floor( amin ) + 1;
amax = floor( amax );
}
}
else
{ if ( (float) asmall > - MINFLOAT )
{ amin -= asmall;
amax += asmall;
}
else
{ amin = floor( amin );
amax = floor( amax ) + 1;
}
}
}
/*
* set return values
*/
*(wcfram) = (float) amin;
*(wcfram+1) = (float) amax;
*(wcfram+2) = (float) abig;
*(wcfram+3) = (float) asmall;
}
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