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/* The paint_marker method, which is an internal function that is called
when the marker() method is invoked. It plots an object: a marker of a
specified type, at a specified size, at the current location.
If this returns `false', marker() will construct the marker from other
libplot primitives, in a generic way. */
/* This implementation is for CGM Plotters. CGM format supports the first
few of our marker types, as CGM primitive objects. */
#include "sys-defines.h"
#include "extern.h"
/* The maximum dimension of most markers, e.g. the diameter of the circle
marker (marker #4). Expressed as a fraction of the `size' argument. */
#define MAXIMUM_MARKER_DIMENSION (5.0/8.0)
bool
#ifdef _HAVE_PROTOS
_c_paint_marker (R___(Plotter *_plotter) int type, double size)
#else
_c_paint_marker (R___(_plotter) type, size)
S___(Plotter *_plotter;)
int type;
double size;
#endif
{
int desired_marker_type, desired_marker_size;
double xd, yd, size_d;
int i_x, i_y;
switch (type)
{
case M_DOT:
desired_marker_type = CGM_M_DOT;
break;
case M_PLUS:
desired_marker_type = CGM_M_PLUS;
break;
case M_ASTERISK:
desired_marker_type = CGM_M_ASTERISK;
break;
case M_CIRCLE:
desired_marker_type = CGM_M_CIRCLE;
break;
case M_CROSS:
desired_marker_type = CGM_M_CROSS;
break;
default:
return false; /* can't draw it in CGM format */
break;
}
if (_plotter->drawstate->pen_type != 0)
/* have a pen to draw with */
{
if (_plotter->cgm_marker_type != desired_marker_type)
/* 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,
desired_marker_type,
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 = desired_marker_type;
}
/* compute size of marker in device frame */
size_d = sqrt(XDV(size,0)*XDV(size,0)+YDV(size,0)*YDV(size,0));
desired_marker_size = IROUND(MAXIMUM_MARKER_DIMENSION * size_d);
if (desired_marker_type != CGM_M_DOT
&& _plotter->cgm_marker_size != desired_marker_size)
/* emit "MARKER SIZE" command (for a dot we don't bother, since
dots are meant to be drawn as small as possible) */
{
int byte_count, data_byte_count, data_len;
data_len = CGM_BINARY_BYTES_PER_INTEGER;
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 7,
data_len, &byte_count,
"MARKERSIZE");
_cgm_emit_integer (_plotter->data->page, false, _plotter->cgm_encoding,
desired_marker_size,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update marker size */
_plotter->cgm_marker_size = desired_marker_size;
}
/* 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);
}
}
return true;
}
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