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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 CGMPlotters. It draws a point as CGM marker #1. */
#include "sys-defines.h"
#include "extern.h"
void
#ifdef _HAVE_PROTOS
_c_paint_point (S___(Plotter *_plotter))
#else
_c_paint_point (S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
double xd, yd;
int i_x, i_y;
if (_plotter->drawstate->pen_type != 0)
/* have a pen to draw with */
{
if (_plotter->cgm_marker_type != CGM_M_DOT)
/* emit "MARKER TYPE" command */
{
int byte_count, data_byte_count, data_len;
data_len = 2; /* number of bytes per index */
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 6,
data_len, &byte_count,
"MARKERTYPE");
_cgm_emit_index (_plotter->data->page, false, _plotter->cgm_encoding,
CGM_M_DOT,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update marker type */
_plotter->cgm_marker_type = CGM_M_DOT;
}
/* N.B. Should we set the marker size as well? Any good CGM
interpreter should draw a dot marker as a very small dot, perhaps
a single pixel. */
/* set CGM marker color */
_c_set_pen_color (R___(_plotter) CGM_OBJECT_MARKER);
/* compute location in device frame */
xd = XD(_plotter->drawstate->pos.x, _plotter->drawstate->pos.y);
yd = YD(_plotter->drawstate->pos.x, _plotter->drawstate->pos.y);
i_x = IROUND(xd);
i_y = IROUND(yd);
/* emit "POLYMARKER" command, to draw a single marker */
{
int byte_count, data_byte_count, data_len;
data_len = 1 * 2 * CGM_BINARY_BYTES_PER_INTEGER;
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_GRAPHICAL_PRIMITIVE_ELEMENT, 3,
data_len, &byte_count,
"MARKER");
_cgm_emit_point (_plotter->data->page, false, _plotter->cgm_encoding,
i_x, i_y,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
}
}
}
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