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/* This file contains the cont() method, which is a standard part of the
libplot. It continues a line from the current position of the graphics
cursor to the point specified by x and y.
This method is used in the construction of paths, i.e. of polylines. By
repeatedly invoking cont(), the user may construct a polyline of
arbitrary length. The polyline will terminate when the user either
(1) explicitly invokes the endpath() method, or
(2) changes the value of one of the relevant drawing attributes,
by invoking move(), linemod(), linewidth(), color(), fillcolor(),
or filltype(), or
(3) draws some non-polyline object, by invoking arc(), box(),
circle(), point(), label(), alabel(), etc., or
(4) invokes restorestate() to restore an earlier drawing state. */
#include "sys-defines.h"
#include "plot.h"
#include "extern.h"
int
#ifdef _HAVE_PROTOS
_m_cont (int x, int y)
#else
_m_cont (x, y)
int x, y;
#endif
{
if (!_plotter->open)
{
_plotter->error ("cont: invalid operation");
return -1;
}
if (_plotter->outstream)
{
if (_plotter->portable_output)
fprintf (_plotter->outstream, "%c %d %d\n",
CONT, x, y);
else
{
putc (CONT, _plotter->outstream);
_emit_integer (x);
_emit_integer (y);
}
}
return 0;
}
int
#ifdef _HAVE_PROTOS
_m_fcont (double x, double y)
#else
_m_fcont (x, y)
double x, y;
#endif
{
if (!_plotter->open)
{
_plotter->error ("fcont: invalid operation");
return -1;
}
if (_plotter->outstream)
{
if (_plotter->portable_output)
fprintf (_plotter->outstream, "%c %g %g\n",
CONT, x, y);
else
{
putc (FCONT, _plotter->outstream);
_emit_float (x);
_emit_float (y);
}
}
return 0;
}
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