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/* This file contains the openpl method, which is a standard part of
libplot. It opens a Plotter object. */
#include "sys-defines.h"
#include "extern.h"
int
#ifdef _HAVE_PROTOS
_API_openpl (S___(Plotter *_plotter))
#else
_API_openpl (S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
bool retval;
if (_plotter->data->open)
{
_plotter->error (R___(_plotter)
"openpl: invalid operation");
return -1;
}
/* prepare buffer in which we'll cache graphics code for this page */
switch ((int)_plotter->data->output_model)
{
case (int)PL_OUTPUT_NONE:
/* a single page buffer is created here, and will be deleted by
closepl(); it's never actually written out */
_plotter->data->page = _new_outbuf ();
break;
break;
case (int)PL_OUTPUT_ONE_PAGE:
case (int)PL_OUTPUT_ONE_PAGE_AT_A_TIME:
/* a single page buffer is created here, and will be written out and
deleted by closepl(); in the former case, only page #1 is written
out */
_plotter->data->page = _new_outbuf ();
break;
case (int)PL_OUTPUT_PAGES_ALL_AT_ONCE:
{
plOutbuf *new_page = _new_outbuf();
if (_plotter->data->opened == false) /* first page */
{
_plotter->data->page = new_page;
/* Save a pointer to the first page, since we'll be caching all
pages until the Plotter is deleted. */
_plotter->data->first_page = new_page;
}
else
/* add new page to tail of list, update pointer to current page */
{
_plotter->data->page->next = new_page;
_plotter->data->page = new_page;
}
}
break;
case (int)PL_OUTPUT_VIA_CUSTOM_ROUTINES:
case (int)PL_OUTPUT_VIA_CUSTOM_ROUTINES_IN_REAL_TIME:
case (int)PL_OUTPUT_VIA_CUSTOM_ROUTINES_TO_NON_STREAM:
/* Plotter does its own output, and doesn't use libplot's
plOutbuf-based output system */
_plotter->data->page = (plOutbuf *)NULL;
break;
default: /* shouldn't happen */
break;
}
/* flag device as open */
_plotter->data->open = true;
_plotter->data->opened = true;
_plotter->data->page_number++;
/* keep track of these; some lusers don't invoke ffontsize() or
flinewidth(), so we need to choose a reasonable font size and/or line
width for them */
_plotter->data->fontsize_invoked = false;
_plotter->data->linewidth_invoked = false;
/* frames in page are numbered starting with zero */
_plotter->data->frame_number = 0;
/* create first drawing state, add it to the linked list of drawing
states (this fills in only the device-independent part of the state) */
_create_first_drawing_state (S___(_plotter));
/* copy background color, accessible to the user as a Plotter parameter,
to the drawing state */
{
const char *bg_color_name_s;
bg_color_name_s =
(const char *)_get_plot_param (_plotter->data, "BG_COLOR");
if (bg_color_name_s)
_API_bgcolorname (R___(_plotter) bg_color_name_s);
}
/* invoke Plotter-specific `begin page' method, to do device-dependent
initializations of Plotter variables, such as the
(NDC_frame)->(device_frame) map, and also to create device-dependent
part of drawing state, if any */
retval = _plotter->begin_page (S___(_plotter));
/* Set the (user frame)->(device frame) map in the drawing state, as if
fsetmatrix() had been called. At this point, the
(user_frame)->(NDC_frame) map is the default, i.e., the identity, and
it won't be altered (since we pass it to fsetmatrix as the argument).
However, fsetmatrix computes the (user_frame)->(device_frame) map by
composing it with the (NDC_frame)->(device_frame) map (see above). */
_API_fsetmatrix (R___(_plotter)
_plotter->drawstate->transform.m_user_to_ndc[0],
_plotter->drawstate->transform.m_user_to_ndc[1],
_plotter->drawstate->transform.m_user_to_ndc[2],
_plotter->drawstate->transform.m_user_to_ndc[3],
_plotter->drawstate->transform.m_user_to_ndc[4],
_plotter->drawstate->transform.m_user_to_ndc[5]);
return (retval == true ? 0 : -1);
}
/* Plotter-specific initializations that take place when openpl() is
invoked. In a generic Plotter, this does nothing. */
bool
#ifdef _HAVE_PROTOS
_g_begin_page (S___(Plotter *_plotter))
#else
_g_begin_page (S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
return true;
}
/* Create a new drawing state that will become the first drawing state in a
Plotter's linked list of drawing states. See above. */
void
#ifdef _HAVE_PROTOS
_create_first_drawing_state (S___(Plotter *_plotter))
#else
_create_first_drawing_state (S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
plDrawState *drawstate;
const plDrawState *copyfrom;
char *fill_rule, *line_mode, *join_mode, *cap_mode;
/* create a new state */
drawstate = (plDrawState *)_plot_xmalloc (sizeof(plDrawState));
/* copy from default drawing state (see g_defstate.c) */
copyfrom = &_default_drawstate;
memcpy (drawstate, copyfrom, sizeof(plDrawState));
/* elements of state that are strings are treated specially */
fill_rule = (char *)_plot_xmalloc (strlen (copyfrom->fill_rule) + 1);
line_mode = (char *)_plot_xmalloc (strlen (copyfrom->line_mode) + 1);
join_mode = (char *)_plot_xmalloc (strlen (copyfrom->join_mode) + 1);
cap_mode = (char *)_plot_xmalloc (strlen (copyfrom->cap_mode) + 1);
strcpy (fill_rule, copyfrom->fill_rule);
strcpy (line_mode, copyfrom->line_mode);
strcpy (join_mode, copyfrom->join_mode);
strcpy (cap_mode, copyfrom->cap_mode);
drawstate->fill_rule = fill_rule;
drawstate->line_mode = line_mode;
drawstate->join_mode = join_mode;
drawstate->cap_mode = cap_mode;
/* dash array, if non-empty, is treated specially too */
if (copyfrom->dash_array_len > 0)
{
int i;
double *dash_array;
dash_array = (double *)_plot_xmalloc (copyfrom->dash_array_len * sizeof(double));
for (i = 0; i < copyfrom->dash_array_len; i++)
dash_array[i] = copyfrom->dash_array[i];
drawstate->dash_array = dash_array;
}
/* The font_name, true_font_name, font_type, typeface_index, and
font_index fields are special, since for the initial drawing state
they're Plotter-dependent.
The fill_rule_type field is also treated specially in the initial
drawing state, because not all Plotters support both types of filling
(odd vs. nonzero winding number). */
{
const char *font_name_init;
char *font_name, *true_font_name;
int typeface_index, font_index;
switch (_plotter->data->default_font_type)
{
case F_HERSHEY:
default:
font_name_init = DEFAULT_HERSHEY_FONT;
typeface_index = DEFAULT_HERSHEY_TYPEFACE_INDEX;
font_index = DEFAULT_HERSHEY_FONT_INDEX;
break;
case F_POSTSCRIPT:
font_name_init = DEFAULT_POSTSCRIPT_FONT;
typeface_index = DEFAULT_POSTSCRIPT_TYPEFACE_INDEX;
font_index = DEFAULT_POSTSCRIPT_FONT_INDEX;
break;
case F_PCL:
font_name_init = DEFAULT_PCL_FONT;
typeface_index = DEFAULT_PCL_TYPEFACE_INDEX;
font_index = DEFAULT_PCL_FONT_INDEX;
break;
case F_STICK:
font_name_init = DEFAULT_STICK_FONT;
typeface_index = DEFAULT_STICK_TYPEFACE_INDEX;
font_index = DEFAULT_STICK_FONT_INDEX;
break;
}
font_name = (char *)_plot_xmalloc (strlen (font_name_init) + 1);
strcpy (font_name, font_name_init);
drawstate->font_name = font_name;
true_font_name = (char *)_plot_xmalloc (strlen (font_name_init) + 1);
strcpy (true_font_name, font_name_init);
drawstate->true_font_name = true_font_name;
drawstate->font_type = _plotter->data->default_font_type;
drawstate->typeface_index = typeface_index;
drawstate->font_index = font_index;
/* Examine default fill mode. If Plotter doesn't support it, use the
other fill mode. */
if (drawstate->fill_rule_type == FILL_ODD_WINDING
&& _plotter->data->have_odd_winding_fill == 0)
drawstate->fill_rule_type = FILL_NONZERO_WINDING;
else if (drawstate->fill_rule_type == FILL_NONZERO_WINDING
&& _plotter->data->have_nonzero_winding_fill == 0)
drawstate->fill_rule_type = FILL_ODD_WINDING;
}
/* page begins with no compound path under construction */
drawstate->path = (plPath *)NULL;
drawstate->paths = (plPath **)NULL;
drawstate->num_paths = 0;
/* install new state at head of the state list */
drawstate->previous = NULL;
_plotter->drawstate = drawstate;
}
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