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/* This internal method is invoked by a CGMPlotter before drawing any path.
It sets the relevant CGM attributes (line type, cap type, join type,
line width) to what they should be. */
#include "sys-defines.h"
#include "extern.h"
/* CGM join styles, indexed by internal number (miter/rd./bevel/triangular) */
const int _cgm_join_style[] =
{ CGM_JOIN_MITER, CGM_JOIN_ROUND, CGM_JOIN_BEVEL, CGM_JOIN_ROUND };
/* CGM cap styles, indexed by internal number (butt/rd./project/triangular) */
/* Note: we map libplot's triangular cap style to CGM's round cap style,
not CGM's triangular cap style, since the latter plots an equilateral
triangle, which is not libplot's convention. */
const int _cgm_cap_style[] =
{ CGM_CAP_BUTT, CGM_CAP_ROUND, CGM_CAP_PROJECTING, CGM_CAP_ROUND };
void
#ifdef _HAVE_PROTOS
_c_set_attributes (R___(Plotter *_plotter) int object_type)
#else
_c_set_attributes (R___(_plotter) object_type)
S___(Plotter *_plotter;)
int object_type; /* closed path? open path? marker? etc.*/
#endif
{
int desired_width = _plotter->drawstate->quantized_device_line_width;
int desired_line_type = CGM_L_SOLID; /* keep compiler happy */
double desired_dash_offset = 0.0;
if (_plotter->drawstate->pen_type == 0)
/* won't be edging; at most, will be filling; so nothing to do */
return;
/* alter CGM line width if necessary */
switch (object_type)
{
case CGM_OBJECT_OPEN:
if (_plotter->cgm_line_width != desired_width)
/* emit "LINE WIDTH" command */
{
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, 3,
data_len, &byte_count,
"LINEWIDTH");
_cgm_emit_integer (_plotter->data->page, false, _plotter->cgm_encoding,
desired_width,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update line width */
_plotter->cgm_line_width = desired_width;
}
break;
case CGM_OBJECT_CLOSED:
if (_plotter->cgm_edge_width != desired_width)
/* emit "EDGE WIDTH" command */
{
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, 28,
data_len, &byte_count,
"EDGEWIDTH");
_cgm_emit_integer (_plotter->data->page, false, _plotter->cgm_encoding,
desired_width,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update edge width */
_plotter->cgm_edge_width = desired_width;
}
break;
default: /* shouldn't happen */
break;
}
/* determine line type */
if (_plotter->data->have_dash_array
&& _plotter->drawstate->dash_array_in_effect)
/* user specified a dash array, and this version of CGM supports them;
so compute a CGM-style dash array, and maybe add a new line type to
page-specific line type table */
{
int num_dashes = _plotter->drawstate->dash_array_len;
int our_num_dashes = num_dashes; /* will double if array length is odd */
if (num_dashes > 0)
/* non-solid line type */
{
double min_sing_val, max_sing_val;
int i, *dashbuf;
plCGMCustomLineType *line_type_ptr, *old_line_type_ptr;
int line_type;
bool odd_length, matched_line_type;
/* compute minimum singular value of user->device coordinate
map, which we use as a multiplicative factor to convert
line widths (cf. g_linewidth.c), dash lengths, etc. */
_matrix_sing_vals (_plotter->drawstate->transform.m,
&min_sing_val, &max_sing_val);
/* double array length if odd (we don't trust CGM interpreters to
handle odd-length dash arrays in the way that PS does) */
odd_length = (num_dashes % 2 != 0 ? true : false);
if (odd_length)
our_num_dashes *= 2;
dashbuf = (int *)_plot_xmalloc (our_num_dashes * sizeof(int));
for (i = 0; i < num_dashes; i++)
{
double dashlen;
int i_dashlen;
dashlen =
min_sing_val * _plotter->drawstate->dash_array[i];
i_dashlen = IROUND(dashlen);
if (i_dashlen == 0 && dashlen > 0.0)
i_dashlen = 1; /* don't use 0 if user specified non-0 */
dashbuf[i] = i_dashlen;
if (odd_length)
dashbuf[i + num_dashes] = i_dashlen;
}
/* compute offset as fraction of cycle length; must be in range
[0.0,1.0] (CGM convention) */
{
int cycle_length = 0;
for (i = 0; i < our_num_dashes; i++)
cycle_length += dashbuf[i];
/* cycle length now guaranteed to be > 0 */
desired_dash_offset =
min_sing_val * _plotter->drawstate->dash_offset / cycle_length;
desired_dash_offset -= IFLOOR(desired_dash_offset);
if (desired_dash_offset < 0.0 || desired_dash_offset >= 1.0)
desired_dash_offset = 0.0;
}
/* search table of user-defined, page-specific CGM line types;
they're numbered -1, -2, -3, ... */
line_type_ptr = (plCGMCustomLineType *)_plotter->data->page->extra;
old_line_type_ptr = (plCGMCustomLineType *)NULL;
line_type = 0;
matched_line_type = false;
while (line_type_ptr != (plCGMCustomLineType *)NULL)
{
line_type--;
if (line_type_ptr->dash_array_len == our_num_dashes)
{
bool foundit = true;
for (i = 0; i < our_num_dashes; i++)
{
if (dashbuf[i] != line_type_ptr->dashes[i])
{
foundit = false;
break; /* break out of for loop */
}
}
if (foundit)
{
matched_line_type = true;
break; /* break out of while loop */
}
}
/* on to next entry in line type table */
old_line_type_ptr = line_type_ptr;
line_type_ptr = line_type_ptr->next;
}
/* on exit from while(), either matched_line_type = true (with
line_type set correctly), or old_line_type_ptr points to tail
of line type list, and `line_type' is the last valid type */
if (matched_line_type)
{
desired_line_type = line_type;
free (dashbuf);
}
else
{
/* construct new record from `dashbuf', add to tail of list;
`dashbuf' and the record will be freed when the page is
written out */
plCGMCustomLineType *newguy;
newguy = (plCGMCustomLineType *)_plot_xmalloc (sizeof(plCGMCustomLineType));
newguy->dashes = dashbuf;
newguy->dash_array_len = our_num_dashes;
newguy->next = (plCGMCustomLineType *)NULL;
if (old_line_type_ptr != (plCGMCustomLineType *)NULL)
old_line_type_ptr->next = newguy;
else
_plotter->data->page->extra = newguy;
/* new line type index is one less than most negative
previously defined index */
desired_line_type = line_type - 1;
}
}
else
/* zero-length dash array, i.e. solid line type */
{
desired_line_type = CGM_L_SOLID;
desired_dash_offset = 0.0;
}
}
else
/* dash array not in effect or cannot be used, use one of CGM's
canonical line types instead */
{
switch (_plotter->drawstate->line_type)
{
case L_SOLID:
default:
desired_line_type = CGM_L_SOLID;
break;
case L_DOTTED:
desired_line_type = CGM_L_DOTTED;
break;
case L_DOTDASHED:
desired_line_type = CGM_L_DOTDASHED;
break;
case L_SHORTDASHED:
desired_line_type = CGM_L_DASHED;
break;
case L_LONGDASHED:
/* can't distinguish from shortdashed */
desired_line_type = CGM_L_DASHED;
break;
case L_DOTDOTDASHED:
desired_line_type = CGM_L_DOTDOTDASHED;
break;
case L_DOTDOTDOTDASHED:
/* map to "dotdotdashed" */
desired_line_type = CGM_L_DOTDOTDASHED;
break;
}
desired_dash_offset = 0.0;
}
switch (object_type)
{
case CGM_OBJECT_OPEN:
if (_plotter->cgm_line_type != desired_line_type)
/* emit "LINE TYPE" command */
{
int byte_count, data_byte_count, data_len;
data_len = 2; /* 2 bytes per index */
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 2,
data_len, &byte_count,
"LINETYPE");
_cgm_emit_index (_plotter->data->page, false, _plotter->cgm_encoding,
desired_line_type,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update line type */
_plotter->cgm_line_type = desired_line_type;
}
if (_plotter->cgm_max_version >= 3
&& _plotter->cgm_dash_offset != desired_dash_offset)
/* emit "LINE TYPE INITIAL OFFSET" command */
{
int byte_count, data_byte_count, data_len;
data_len = 4; /* 4 bytes per fixed-pt. real */
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 40,
data_len, &byte_count,
"LINETYPEINITOFFSET");
_cgm_emit_real_fixed_point (_plotter->data->page, false, _plotter->cgm_encoding,
desired_dash_offset,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update dash offset, and CGM version needed for this page */
_plotter->cgm_dash_offset = desired_dash_offset;
_plotter->cgm_page_version = IMAX(3, _plotter->cgm_page_version);
}
break;
case CGM_OBJECT_CLOSED:
if (_plotter->cgm_edge_type != desired_line_type)
/* emit "EDGE TYPE" command */
{
int byte_count, data_byte_count, data_len;
data_len = 2; /* 2 bytes per index */
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 27,
data_len, &byte_count,
"EDGETYPE");
_cgm_emit_index (_plotter->data->page, false, _plotter->cgm_encoding,
desired_line_type,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update edge type */
_plotter->cgm_edge_type = desired_line_type;
}
if (_plotter->cgm_max_version >= 3
&& _plotter->cgm_edge_dash_offset != desired_dash_offset)
/* emit "EDGE TYPE INITIAL OFFSET" command */
{
int byte_count, data_byte_count, data_len;
data_len = 4; /* 4 bytes per fixed-pt. real */
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 47,
data_len, &byte_count,
"EDGETYPEINITOFFSET");
_cgm_emit_real_fixed_point (_plotter->data->page, false, _plotter->cgm_encoding,
desired_dash_offset,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update dash offset, and CGM version needed for this page */
_plotter->cgm_edge_dash_offset = desired_dash_offset;
_plotter->cgm_page_version = IMAX(3, _plotter->cgm_page_version);
}
break;
default:
break;
}
if (_plotter->cgm_max_version >= 3)
/* have line/edge cap/join style, and miter limit commands */
{
int desired_join_style = _cgm_join_style[_plotter->drawstate->join_type];
int desired_cap_style = _cgm_cap_style[_plotter->drawstate->cap_type];
double desired_miter_limit = _plotter->drawstate->miter_limit;
switch (object_type)
{
case CGM_OBJECT_OPEN:
if (_plotter->cgm_cap_style != desired_cap_style)
/* emit "LINE CAP" command */
{
int byte_count, data_byte_count, data_len;
/* set line cap style */
data_len = 2 * 2; /* 2 bytes per index */
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 37,
data_len, &byte_count,
"LINECAP");
_cgm_emit_index (_plotter->data->page, false, _plotter->cgm_encoding,
desired_cap_style,
data_len, &data_byte_count, &byte_count);
_cgm_emit_index (_plotter->data->page, false, _plotter->cgm_encoding,
CGM_DASH_CAP_MATCH,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update cap style, and CGM version needed for this page */
_plotter->cgm_cap_style = desired_cap_style;
_plotter->cgm_page_version = IMAX(3, _plotter->cgm_page_version);
}
break;
case CGM_OBJECT_CLOSED:
if (_plotter->cgm_edge_cap_style != desired_cap_style)
/* emit "EDGE CAP" command */
{
int byte_count, data_byte_count, data_len;
data_len = 2 * 2; /* 2 bytes per index */
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 44,
data_len, &byte_count,
"EDGECAP");
_cgm_emit_index (_plotter->data->page, false, _plotter->cgm_encoding,
desired_cap_style,
data_len, &data_byte_count, &byte_count);
_cgm_emit_index (_plotter->data->page, false, _plotter->cgm_encoding,
CGM_DASH_CAP_MATCH,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update edge cap style, and CGM version needed for this page */
_plotter->cgm_edge_cap_style = desired_cap_style;
_plotter->cgm_page_version = IMAX(3, _plotter->cgm_page_version);
}
break;
default:
break;
}
switch (object_type)
{
case CGM_OBJECT_OPEN:
if (_plotter->cgm_join_style != desired_join_style)
/* emit "LINE JOIN" command */
{
int byte_count, data_byte_count, data_len;
/* set line join style */
data_len = 2; /* 2 bytes per index */
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 38,
data_len, &byte_count,
"LINEJOIN");
_cgm_emit_index (_plotter->data->page, false, _plotter->cgm_encoding,
desired_join_style,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update join style, and CGM version needed for this page */
_plotter->cgm_join_style = desired_join_style;
_plotter->cgm_page_version = IMAX(3, _plotter->cgm_page_version);
}
break;
case CGM_OBJECT_CLOSED:
if (_plotter->cgm_edge_join_style != desired_join_style)
/* emit "EDGE JOIN" command */
{
int byte_count, data_byte_count, data_len;
/* do it over again, this time for edge join style */
data_len = 2; /* 2 bytes per index */
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_ATTRIBUTE_ELEMENT, 45,
data_len, &byte_count,
"EDGEJOIN");
_cgm_emit_index (_plotter->data->page, false, _plotter->cgm_encoding,
desired_join_style,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update edge join style, and CGM version needed for this page*/
_plotter->cgm_edge_join_style = desired_join_style;
_plotter->cgm_page_version = IMAX(3, _plotter->cgm_page_version);
}
break;
default:
break;
}
if (_plotter->cgm_miter_limit != desired_miter_limit)
/* emit "MITRE LIMIT" command */
{
int byte_count, data_byte_count, data_len;
data_len = 4; /* 4 bytes per fixed-point real */
byte_count = data_byte_count = 0;
_cgm_emit_command_header (_plotter->data->page, _plotter->cgm_encoding,
CGM_CONTROL_ELEMENT, 19,
data_len, &byte_count,
"MITRELIMIT");
_cgm_emit_real_fixed_point (_plotter->data->page, false, _plotter->cgm_encoding,
desired_miter_limit,
data_len, &data_byte_count, &byte_count);
_cgm_emit_command_terminator (_plotter->data->page, _plotter->cgm_encoding,
&byte_count);
/* update miter limit, and CGM version needed for this page */
_plotter->cgm_miter_limit = desired_miter_limit;
_plotter->cgm_page_version = IMAX(3, _plotter->cgm_page_version);
}
}
}
|
