ngspice/src/frontend/plotting/xgraph.c

/**********
Copyright 1992 Regents of the University of California.  All rights reserved.
Author: 1992 David A. Gates, U. C. Berkeley CAD Group
**********/

/*
 * Xgraph-11 plots.
 */

#include "ngspice.h"
#include "cpdefs.h"
#include "ftedefs.h"
#include "dvec.h"
#include "fteparse.h"
#include "xgraph.h"


#define XG_MAXVECTORS 64

void
ft_xgraph(double *xlims, double *ylims, char *filename, char *title, char *xlabel, char *ylabel, GRIDTYPE gridtype, PLOTTYPE plottype, struct dvec *vecs)
{

    FILE *file;
    struct dvec *v, *scale;
    double xval, yval;
    int i, numVecs, linewidth;
    bool xlog, ylog, nogrid, markers;
    char buf[BSIZE_SP], pointstyle[BSIZE_SP], *text;

    /* Sanity checking. */
    for ( v = vecs, numVecs = 0; v; v = v->v_link2 ) {
	numVecs++;
    }
    if (numVecs == 0) {
	return;
    } else if (numVecs > XG_MAXVECTORS) {
	fprintf( cp_err, "Error: too many vectors for Xgraph.\n" );
	return;
    }
    if (!cp_getvar("xbrushwidth", VT_NUM, &linewidth))
        linewidth = 1;
    if (linewidth < 1) linewidth = 1;

    if (!cp_getvar("pointstyle", VT_STRING, pointstyle)) {
        markers = FALSE;
    } else {
	if (cieq(pointstyle,"markers")) {
	    markers = TRUE;
	} else {
	    markers = FALSE;
	}
    }


    /* Make sure the gridtype is supported. */
    switch (gridtype) {
    case GRID_LIN:
	nogrid = xlog = ylog = FALSE;
	break;
    case GRID_XLOG:
	xlog = TRUE;
	nogrid = ylog = FALSE;
	break;
    case GRID_YLOG:
	ylog = TRUE;
	nogrid = xlog = FALSE;
	break;
    case GRID_LOGLOG:
	xlog = ylog = TRUE;
	nogrid = FALSE;
	break;
    case GRID_NONE:
	nogrid = TRUE;
	xlog = ylog = FALSE;
	break;
    default:
	fprintf( cp_err, "Error: grid type unsupported by Xgraph.\n" );
	return;
    }

    /* Open the output file. */
    if (!(file = fopen(filename, "w"))) {
	perror(filename);
	return;
    }

    /* Set up the file header. */
    if (title) {
	text = cp_unquote(title);
	fprintf( file, "TitleText: %s\n", text );
	tfree(text);
    }
    if (xlabel) {
	text = cp_unquote(xlabel);
	fprintf( file, "XUnitText: %s\n", text );
	tfree(text);
    }
    if (ylabel) {
	text = cp_unquote(ylabel);
	fprintf( file, "YUnitText: %s\n", text );
	tfree(text);
    }
    if (nogrid) {
	fprintf( file, "Ticks: True\n" );
    }
    if (xlog) {
	fprintf( file, "LogX: True\n" );
	if (xlims) {
	    fprintf( file, "XLowLimit:  % e\n", log10(xlims[0]) );
	    fprintf( file, "XHighLimit: % e\n", log10(xlims[1]) );
	}
    } else {
	if (xlims) {
	    fprintf( file, "XLowLimit:  % e\n", xlims[0] );
	    fprintf( file, "XHighLimit: % e\n", xlims[1] );
	}
    }
    if (ylog) {
	fprintf( file, "LogY: True\n" );
	if (ylims) {
	    fprintf( file, "YLowLimit:  % e\n", log10(ylims[0]) );
	    fprintf( file, "YHighLimit: % e\n", log10(ylims[1]) );
	}
    } else {
	if (ylims) {
	    fprintf( file, "YLowLimit:  % e\n", ylims[0] );
	    fprintf( file, "YHighLimit: % e\n", ylims[1] );
	}
    }
    fprintf( file, "LineWidth: %d\n", linewidth );
    fprintf( file, "BoundBox: True\n" );
    if (plottype == PLOT_COMB) {
	fprintf( file, "BarGraph: True\n" );
	fprintf( file, "NoLines: True\n" );
    } else if (plottype == PLOT_POINT) {
	if (markers) {
	    fprintf( file, "Markers: True\n" );
	} else {
	    fprintf( file, "LargePixels: True\n" );
	}
	fprintf( file, "NoLines: True\n" );
    }

    /* Write out the data. */
    for ( v = vecs; v; v = v->v_link2 ) {
	scale = v->v_scale;
	if (v->v_name) {
	    fprintf( file, "\"%s\"\n", v->v_name );
	}
	for ( i = 0; i < scale->v_length; i++ ) {
	    xval = isreal(scale) ?
		scale->v_realdata[i] : realpart(&scale->v_compdata[i]);
	    yval = isreal(v) ?
		v->v_realdata[i] : realpart(&v->v_compdata[i]);
	    fprintf( file, "% e % e\n", xval, yval );
	}
	fprintf( file, "\n" );
    }
    (void) fclose( file );
    (void) sprintf( buf, "xgraph %s &", filename );
    (void) system( buf );


    return;
}