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/* This file contains the linerel() method, which is a GNU extension to
libplot. linerel() is simply a version of line() that uses relative
coordinates. It draws an object: a line segment extending from one
specified point to another. By repeatedly invoking cont(), the user may
extend this line object to a polyline object. */
#include "sys-defines.h"
#include "plot.h"
#include "extern.h"
int
#ifdef _HAVE_PROTOS
_m_linerel (int x0, int y0, int x1, int y1)
#else
_m_linerel (x0, y0, x1, y1)
int x0, y0, x1, y1;
#endif
{
if (!_plotter->open)
{
_plotter->error ("linerel: invalid operation");
return -1;
}
if (_plotter->outstream)
{
if (_plotter->portable_output)
fprintf(_plotter->outstream, "%c %d %d %d %d\n",
LINEREL, x0, y0, x1, y1);
else
{
putc (LINEREL, _plotter->outstream);
_emit_integer (x0);
_emit_integer (y0);
_emit_integer (x1);
_emit_integer (y1);
}
}
return 0;
}
int
#ifdef _HAVE_PROTOS
_m_flinerel (double x0, double y0, double x1, double y1)
#else
_m_flinerel (x0, y0, x1, y1)
double x0, y0, x1, y1;
#endif
{
if (!_plotter->open)
{
_plotter->error ("flinerel: invalid operation");
return -1;
}
if (_plotter->outstream)
{
if (_plotter->portable_output)
fprintf(_plotter->outstream, "%c %g %g %g %g\n",
LINEREL, x0, y0, x1, y1);
else
{
putc (FLINEREL, _plotter->outstream);
_emit_float (x0);
_emit_float (y0);
_emit_float (x1);
_emit_float (y1);
}
}
return 0;
}
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