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/* This file is part of the GNU plotutils package. Copyright (C) 1995,
1996, 1997, 1998, 1999, 2000, 2005, 2008, Free Software Foundation, Inc.
The GNU plotutils package is free software. You may redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software foundation; either version 2, or (at your
option) any later version.
The GNU plotutils package is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License along
with the GNU plotutils package; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 51 Franklin St., Fifth Floor,
Boston, MA 02110-1301, USA. */
/* The internal point-drawing function, which point() is a wrapper around.
It draws a point at the current location. There is no standard
definition of `point', so any Plotter is free to implement this as it
sees fit. */
/* TekPlotter objects display a point as a zero-length line segment. */
#include "sys-defines.h"
#include "extern.h"
void
_pl_t_paint_point (S___(Plotter *_plotter))
{
double xx, yy;
int ixx, iyy;
if (_plotter->drawstate->pen_type != 0)
/* have a pen to draw with */
{
/* convert point to floating-point device coordinates */
xx = XD(_plotter->drawstate->pos.x, _plotter->drawstate->pos.y);
yy = YD(_plotter->drawstate->pos.x, _plotter->drawstate->pos.y);
/* do nothing if point is outside device clipping rectangle */
if ((xx < TEK_DEVICE_X_MIN_CLIP)
|| (xx > TEK_DEVICE_X_MAX_CLIP)
|| (yy < TEK_DEVICE_Y_MIN_CLIP)
|| (yy > TEK_DEVICE_Y_MAX_CLIP))
return;
/* round to integer device (Tektronix) coordinates */
ixx = IROUND(xx);
iyy = IROUND(yy);
/* emit an escape sequence if necessary, to switch to POINT mode */
_pl_t_tek_mode (R___(_plotter) TEK_MODE_POINT);
/* sync Tek's color too (significant only for kermit Tek emulator) */
_pl_t_set_pen_color (S___(_plotter));
/* Output the point. If in fact we were already in POINT mode, this
is slightly suboptimal because we can't call
_pl_t_tek_vector_compressed() to save (potentially) a few bytes,
because we don't know what the last-plotted point was. Unlike
when incrementally drawing a polyline, when plotting points we
don't keep track of "where we last were". */
_pl_t_tek_vector (R___(_plotter) ixx, iyy);
/* update our notion of Tek's notion of position */
_plotter->tek_pos.x = ixx;
_plotter->tek_pos.y = iyy;
}
}
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