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/* This file contains the endpath() method, which is a GNU extension to
libplot. A polyline object may be constructed incrementally, by
repeated invocations of the cont() method. (See the comments in
g_cont.c.) The construction may be terminated, and the polyline object
finalized, by an explict invocation of endpath().
If endpath() is invoked when no polyline is under construction, it has
no effect. */
#include "sys-defines.h"
#include "plot.h"
#include "extern.h"
int
#ifdef _HAVE_PROTOS
_x_endpath (void)
#else
_x_endpath ()
#endif
{
int i;
bool closed;
XPoint *xarray;
int polyline_len;
if (!_plotter->open)
{
_plotter->error ("endpath: invalid operation");
return -1;
}
/* If a circular arc has been stashed rather than drawn, force it to be
drawn by invoking farc() with the `immediate' flag set. Note that
if an arc is stashed, PointsInLine must be zero. */
if (_plotter->drawstate->arc_stashed)
{
double axc = _plotter->drawstate->axc;
double ayc = _plotter->drawstate->ayc;
double ax0 = _plotter->drawstate->ax0;
double ay0 = _plotter->drawstate->ay0;
double ax1 = _plotter->drawstate->ax1;
double ay1 = _plotter->drawstate->ay1;
_plotter->drawstate->arc_immediate = true;
_plotter->drawstate->arc_polygonal = false; /* advisory only */
_plotter->farc (axc, ayc, ax0, ay0, ax1, ay1);
_plotter->drawstate->arc_immediate = false;
_plotter->drawstate->arc_stashed = false;
}
if (_plotter->drawstate->PointsInLine == 0) /* nothing to do */
return 0;
if (_plotter->drawstate->PointsInLine == 1) /* shouldn't happen */
{
/* just reset polyline storage buffer */
free (_plotter->drawstate->datapoints);
_plotter->drawstate->datapoints_len = 0;
_plotter->drawstate->PointsInLine = 0;
return 0;
}
if ((_plotter->drawstate->PointsInLine >= 3) /* check for closure */
&& (_plotter->drawstate->datapoints[_plotter->drawstate->PointsInLine - 1].x == _plotter->drawstate->datapoints[0].x)
&& (_plotter->drawstate->datapoints[_plotter->drawstate->PointsInLine - 1].y == _plotter->drawstate->datapoints[0].y))
closed = true;
else
closed = false; /* 2-point ones should be open */
/* must prepare an array of XPoint structures (X11 uses short ints for these) */
xarray = (XPoint *)_plot_xmalloc (_plotter->drawstate->PointsInLine * sizeof(XPoint));
/* convert vertices to device coordinates, removing runs */
polyline_len = 0;
for (i = 0; i < _plotter->drawstate->PointsInLine; i++)
{
int device_x, device_y;
device_x = IROUND(XD(_plotter->drawstate->datapoints[i].x,
_plotter->drawstate->datapoints[i].y));
device_y = IROUND(YD(_plotter->drawstate->datapoints[i].x,
_plotter->drawstate->datapoints[i].y));
if ((polyline_len == 0) || (device_x != xarray[polyline_len-1].x) || (device_y != xarray[polyline_len-1].y))
{
xarray[polyline_len].x = device_x;
xarray[polyline_len].y = device_y;
polyline_len++;
}
}
/* place current line attributes in the X GC */
_plotter->set_attributes();
if (_plotter->drawstate->points_are_connected)
{
/* general case: points are vertices of a polyline */
if (_plotter->drawstate->fill_level) /* not transparent */
{
/* select fill color as X foreground color */
_plotter->set_fill_color();
if (_plotter->drawable1)
XFillPolygon (_plotter->dpy, _plotter->drawable1,
_plotter->drawstate->gc,
xarray, polyline_len,
Complex, CoordModeOrigin);
if (_plotter->drawable2)
XFillPolygon (_plotter->dpy, _plotter->drawable2,
_plotter->drawstate->gc,
xarray, polyline_len,
Complex, CoordModeOrigin);
}
/* select pen color as X foreground color */
_plotter->set_pen_color();
if (_plotter->drawable1)
XDrawLines (_plotter->dpy, _plotter->drawable1,
_plotter->drawstate->gc,
xarray, polyline_len,
CoordModeOrigin);
if (_plotter->drawable2)
XDrawLines (_plotter->dpy, _plotter->drawable2,
_plotter->drawstate->gc,
xarray, polyline_len,
CoordModeOrigin);
}
else
{
/* special case: disconnected points, no real polyline */
/* select pen color as X foreground color */
_plotter->set_pen_color();
if (_plotter->drawable1)
XDrawPoints (_plotter->dpy, _plotter->drawable1, _plotter->drawstate->gc,
xarray, polyline_len,
CoordModeOrigin);
if (_plotter->drawable2)
XDrawPoints (_plotter->dpy, _plotter->drawable2, _plotter->drawstate->gc,
xarray, polyline_len,
CoordModeOrigin);
}
/* reset polyline storage buffer */
if (_plotter->drawstate->PointsInLine > 0)
{
free (xarray); /* free our array of XPoints */
_plotter->drawstate->PointsInLine = 0;
free (_plotter->drawstate->datapoints);
_plotter->drawstate->datapoints_len = 0;
}
_handle_x_events();
return 0;
}
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