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/* 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. */
/* This version is for XDrawablePlotters and XPlotters. It calls
_maybe_handle_x_events(), which is a no-op for the former but not the
latter (it flushes the X output buffer and may also check for events).
Since point() is used mostly by people drawing images, it may be invoked
a great many times. To speed things up, the call to
_maybe_handle_x_events() is performed only once per X_POINT_FLUSH_PERIOD
invocations of this function. */
#define X_POINT_FLUSH_PERIOD 8
#include "sys-defines.h"
#include "extern.h"
void
#ifdef _HAVE_PROTOS
_x_paint_point (S___(Plotter *_plotter))
#else
_x_paint_point (S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
double xx, yy;
int ix, iy;
plColor oldcolor, newcolor;
if (_plotter->drawstate->pen_type != 0)
/* have a pen to draw with */
{
/* set pen color as foreground color in GC used for drawing (but
first, check whether we can avoid a function call) */
newcolor = _plotter->drawstate->fgcolor;
oldcolor = _plotter->drawstate->x_current_fgcolor; /* as stored in gc */
if (newcolor.red != oldcolor.red
|| newcolor.green != oldcolor.green
|| newcolor.blue != oldcolor.blue
|| ! _plotter->drawstate->x_gc_fgcolor_status)
_x_set_pen_color (S___(_plotter));
xx = XD(_plotter->drawstate->pos.x, _plotter->drawstate->pos.y);
yy = YD(_plotter->drawstate->pos.x, _plotter->drawstate->pos.y);
ix = IROUND(xx);
iy = IROUND(yy);
if (_plotter->x_double_buffering != DBL_NONE)
/* double buffering, have a `x_drawable3' to draw into */
XDrawPoint (_plotter->x_dpy, _plotter->x_drawable3,
_plotter->drawstate->x_gc_fg,
ix, iy);
else
/* not double buffering, have no `x_drawable3' */
{
if (_plotter->x_drawable1)
XDrawPoint (_plotter->x_dpy, _plotter->x_drawable1,
_plotter->drawstate->x_gc_fg,
ix, iy);
if (_plotter->x_drawable2)
XDrawPoint (_plotter->x_dpy, _plotter->x_drawable2,
_plotter->drawstate->x_gc_fg,
ix, iy);
}
}
/* maybe flush X output buffer and handle X events (a no-op for
XDrawablePlotters, which is overridden for XPlotters) */
if (_plotter->x_paint_pixel_count % X_POINT_FLUSH_PERIOD == 0)
_maybe_handle_x_events (S___(_plotter));
_plotter->x_paint_pixel_count++;
}
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