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/*
* .\" e
* .TH MAG 1 UMFT
* .SH NAME
* mag \- computes fontsizes and magsteps
*
* .de Ex
* .sp
* .RS
* .nf
* .ft C
* ..
* .de Xe
* .RE
* .sp
* .fi
* ..
* .SH SYNOPSIS
* .B
* mag
* [-\fBR\fIdpi\fP\fP] magstep . . .
*
* .B
* mag
* [-\fBr\fP] [-\fBR\fP\fIdpi\fP] fontsize . . .
*
* .SH DESCRIPTION
* .EQ
* delim $$
* .EN
* This tool calculates fontsizes given magsteps. TeXfonts are provided as
* true sized fonts or as magnifications. The fontsize of a true sized
* font equals the resolution of the printer (ex. 300). The fontsize
* of a font magnified $n$ \fImagsteps\fP equals:
* .EQ
* 1.2 sup{n} times 300
* delim off
* .EN
* rounded to its nearest integer value. Fontnames for TeX fonts normally
* consists of the name (\fIcmr\fP), pointsize (\fI10\fP), type (\fIpk\fP)
* and fontsize (\fI360\fP), for example: \fIcmr10.360pk\fP.
*
* .SH EXAMPLES
* The result of \fImag -R240 -2 0 0.5 1\fP will be:
* .Ex
* 167 240 263 288
* .Xe
*
* The inverse function is computed with the \fI-r\fP option. The result of
* \fImag -r -R240 167 240 263 288\fP
* will be the fontsteps:
* .Ex
* -2 0 0.5 1
* .Xe
*
* The UNIX shells allow command substitution. One can write:
* .Ex
* mag -r -R240 `mag -R240 -2 0 0.5 1`
* .Xe
*
* .SH DATE
* August, 1992
*
* .SH AUTHOR
* .nf
* Piet Tutelaers
* University of Technology Eindhoven
* rcpt@urc.tue.nl
*/
#include <ctype.h>
#include <math.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "basics.h" /* fatal() */
int invert = 0;
float DPI = 300.0;
int main(int argc, char *argv[]) {
float sz, arg; int c;
char *myname = "mag";
short done;
/* prototypes */
int fontsize(double);
double stepsize(double);
while (--argc > 0 && (*++argv)[0] == '-') {
if (isdigit((int)(*argv)[1])) { /* allow negative numbers as arguments */
break;
}
done=0;
while ((!done) && (c = *++argv[0])) /* allow -bcK like options */
switch (c) {
case 'r':
invert = 1; break;
case 'R':
if (*++argv[0] == '\0') {
argc--; argv++;
}
DPI = atof(argv[0]);
done = 1;
break;
default:
fatal("%s: %c illegal option\n", myname, c);
}
}
if (argc < 1)
fatal("Usage: %s [-r] [-Rdpi] size . . .\n", myname);
for ( ; argc; argc--, argv++) {
arg=atof(argv[0]);
switch (invert) {
case 0:
printf("%d%c", fontsize(arg), argc > 1 ? ' ' : '\n');
break;
case 1:
sz=stepsize(arg);
if (((int)(10*sz))%10==0)
printf("%d%c", (int)sz, argc > 1 ? ' ' : '\n');
else
printf("%f%c", sz, argc > 1 ? ' ' : '\n');
}
}
return 0;
}
int fontsize(x) double x;
{
return(DPI*pow(1.2, x) + 0.5);
}
double stepsize(x) double x;
{ double s;
s=(log(x)-log(DPI))/log(1.2);
if (s>=0) return floor(10*s+0.5)/10;
return -floor(10*(-s)+0.5)/10;
}
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