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/* This file contains the alabel method, which is a GNU extension to
libplot. It draws a label, i.e. a text string, at the current location.
Horizontal and vertical justification must be specified. */
#include "sys-defines.h"
#include "plot.h"
#include "extern.h"
/* ALABEL takes three arguments X_JUSTIFY, Y_JUSTIFY, and S, and places the
label S according to the x and y axis adjustments specified in X_JUSTIFY
and Y_JUSTIFY. X_JUSTIFY is equal to 'l', 'c', or 'r', signifying
left-justified, centered, or right-justified, relative to the current
position. Y_JUSTIFY is equal to 'b', 'x', 'c', or 't', signifying that
the bottom, baseline, center, or top of the label should pass through
the current position. */
int
#ifdef _HAVE_PROTOS
_m_alabel (int x_justify, int y_justify, const char *s)
#else
_m_alabel (x_justify, y_justify, s)
int x_justify, y_justify;
const char *s;
#endif
{
char x_justify_c, y_justify_c;
char *nl;
x_justify_c = (char)x_justify;
y_justify_c = (char)y_justify;
if (!_plotter->open)
{
_plotter->error ("alabel: invalid operation");
return -1;
}
if (_plotter->outstream)
{
/* null pointer handled specially */
if (s == NULL)
s = "(null)";
if ((nl = strchr (s, '\n')))
*nl = '\0'; /* don't grok multiline arg strings */
fprintf(_plotter->outstream, "%c%c%c%s\n",
ALABEL, x_justify_c, y_justify_c, s);
}
return 0;
}
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