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/* This file contains the linedash method, which is a GNU extension to
libplot. It sets a drawing attribute: the dash array used for
subsequent drawing of paths. */
#include "sys-defines.h"
#include "extern.h"
int
#ifdef _HAVE_PROTOS
_API_flinedash (R___(Plotter *_plotter) int n, const double *dashes, double offset)
#else
_API_flinedash (R___(_plotter) n, dashes, offset)
S___(Plotter *_plotter;)
int n;
const double *dashes;
double offset;
#endif
{
double *dash_array;
int i;
if (!_plotter->data->open)
{
_plotter->error (R___(_plotter)
"flinedash: invalid operation");
return -1;
}
if (_plotter->drawstate->path)
_API_endpath (S___(_plotter)); /* flush path if any */
/* sanity checks */
if (n < 0 || (n > 0 && dashes == NULL))
return -1;
for (i = 0; i < n; i++)
if (dashes[i] < 0.0)
return -1;
if (_plotter->drawstate->dash_array_len > 0)
free ((double *)_plotter->drawstate->dash_array);
if (n > 0)
dash_array = (double *)_plot_xmalloc (n * sizeof(double));
else
dash_array = NULL;
_plotter->drawstate->dash_array_len = n;
for (i = 0; i < n; i++)
dash_array[i] = dashes[i];
_plotter->drawstate->dash_array = dash_array;
_plotter->drawstate->dash_offset = offset;
/* for future paths, use dash array rather than line mode */
_plotter->drawstate->dash_array_in_effect = true;
return 0;
}
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