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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. */
/* TekPlotter objects display a point as a zero-length line segment. */
#include "sys-defines.h"
#include "extern.h"
void
#ifdef _HAVE_PROTOS
_t_paint_point (S___(Plotter *_plotter))
#else
_t_paint_point (S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
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 */
_tek_mode (R___(_plotter) MODE_POINT);
/* sync Tek's color too (significant only for kermit Tek emulator) */
_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
_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". */
_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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