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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define import_spp
#define import_error
#include <iraf.h>
#include "sgiUtil.h"
/*
* SGI2UHPGL.C -- Read IRAF SGI metacode from standard input, translate into
* HP graphics language call for HP 7550A plotter
*
* Usage
* sgi2uhpgl.e [sgi_metacode] [| lpr -Papple]
*
*/
#define OSOK 0 /* normal successful completion */
#define LEN_MCBUF 1024 /* number of SGK instrs in buffer */
#define SGK_FRAME 1 /* new frame instruction */
#define SGK_MOVE 2 /* move pen */
#define SGK_DRAW 3 /* draw pen */
#define SGK_SETLW 4 /* set line width */
#define GKI_MAXNDC 32767 /* SGK units */
/* Device opcodes and parameters.
*/
#define DEV_INIT "IN;DF;SP1;" /* initialize */
#define DEV_END "SP0;PG:" /* terminate */
#define DEV_FRAME "PG;" /* newframe */
#define DEV_MOVE "PU" /* move */
#define DEV_DRAW "PD" /* draw */
#define PRES 1016 /* plotter resolution per inch */
#define XLEN_INCHES 10.0 /* width of plot (x) in inches */
#define YLEN_INCHES 8.0 /* height of plot (y) in inches */
#define XSCALE PRES * XLEN_INCHES / GKI_MAXNDC
#define YSCALE PRES * YLEN_INCHES / GKI_MAXNDC
#define SZ_COORD 4 /* no. of chars in device coordinate */
struct sgi_inst {
short opcode;
short x;
short y;
};
static void translate (FILE *in, FILE *out);
/* MAIN -- Main entry point for SGI2UHPGL. Optional arguments are device
* window parameters and name of input file.
*/
int
main (int argc, char *argv[])
{
FILE *in;
char *infile;
infile = "stdin";
/* Process the command line.
*/
infile = argv[1];
if (strcmp (infile, "stdin") == 0)
in = stdin;
else
in = fopen (infile, "r");
if (in == NULL) {
fprintf (stderr, "Fatal error (sgi2uhpp): Cannot open `%s'\n",
infile);
fflush (stderr);
exit (OSOK+1);
}
/* Process the metacode.
*/
translate (in, stdout);
if (in != stdin)
fclose (in);
return (0);
}
/* TRANSLATE -- Interpret input SGI metacode instructions into device
* instructions and write to stdout.
*/
static void
translate (FILE *in, FILE *out)
{
register struct sgi_inst *sgip;
struct sgi_inst inbuf[LEN_MCBUF], *buftop;
int n, swap_bytes;
float x, y;
swap_bytes = isSwapped();
/* Output device initialization.
*/
fprintf (out, "%s\n", DEV_INIT);
/* Initialize pen width. Not implemented.
*/
/* Process the metacode:
*/
while ((n = fread ((char *)inbuf, sizeof(*sgip), LEN_MCBUF, in)) > 0) {
if (swap_bytes)
bswap2 ((unsigned char *)inbuf, (unsigned char *)inbuf,
sizeof(*sgip) * n);
buftop = inbuf + n;
for (sgip = inbuf; sgip < buftop; sgip++) {
switch (sgip->opcode) {
case SGK_FRAME:
fprintf (out, "%s\n", DEV_FRAME);
break;
case SGK_MOVE:
x = sgip->x * XSCALE;
y = sgip->y * YSCALE;
fprintf (out,
"%s%06.0f%s%06.0f%s\n", DEV_MOVE, x, ",", y, ";");
break;
case SGK_DRAW:
x = sgip->x * XSCALE;
y = sgip->y * YSCALE;
fprintf (out,
"%s%06.0f%s%06.0f%s\n", DEV_DRAW, x, ",", y, ";");
break;
case SGK_SETLW:
/* Set pen width.
*/
break;
default:
fprintf (stderr, "sgi2uhpp: unrecognized sgi opcode %d\n",
sgip->opcode);
break;
}
}
}
/* Terminate plotting and exit.
*/
fwrite (DEV_END, strlen(DEV_END), 1, out);
fprintf (out, "\n");
}
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