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/* This file contains a utility function, _set_page_type(), which searches
the database of known pagetypes for the one specified in the PAGESIZE
parameter, sets page-related data (dimensions, size of viewport) in the
Plotter, and also passes back the viewport offset vector.
The PAGESIZE parameter should be of a form resembling "letter", or "a4",
or "letter,xoffset=-1.2in", or "a4,yoffset=0.5cm,xoffset = 2mm". */
#include "sys-defines.h"
#include "extern.h"
#include "g_pagetype.h"
/* forward references */
static bool _parse_page_type ____P((const char *pagesize, const plPageData **pagedata, double *xoffset, double *yoffset, double *xorigin, double *yorigin, double *xsize, double *ysize));
static bool _string_to_inches ____P ((const char *string, double *inches));
void
#ifdef _HAVE_PROTOS
_set_page_type (plPlotterData *data)
#else
_set_page_type (data)
plPlotterData *data;
#endif
{
const char *pagesize;
const plPageData *pagedata;
double viewport_xoffset, viewport_yoffset;
double viewport_xorigin, viewport_yorigin;
double viewport_xsize, viewport_ysize;
/* examine user-specified value for PAGESIZE parameter, or the default
value if we can't parse the user-specified value */
pagesize = (const char *)_get_plot_param (data, "PAGESIZE");
if (!_parse_page_type (pagesize, &pagedata,
&viewport_xoffset, &viewport_yoffset,
&viewport_xorigin, &viewport_yorigin,
&viewport_xsize, &viewport_ysize))
{
pagesize = (const char *)_get_default_plot_param ("PAGESIZE");
_parse_page_type (pagesize, &pagedata,
&viewport_xoffset, &viewport_yoffset,
&viewport_xorigin, &viewport_yorigin,
&viewport_xsize, &viewport_ysize);
}
/* set page data in Plotter */
data->page_data = pagedata;
data->viewport_xoffset = viewport_xoffset;
data->viewport_yoffset = viewport_yoffset;
data->viewport_xorigin = viewport_xorigin;
data->viewport_yorigin = viewport_yorigin;
data->viewport_xsize = viewport_xsize;
data->viewport_ysize = viewport_ysize;
}
static bool
#ifdef _HAVE_PROTOS
_parse_page_type (const char *pagesize, const plPageData **pagedata, double *xoffset, double *yoffset, double *xorigin, double *yorigin, double *xsize, double *ysize)
#else
_parse_page_type (pagesize, pagedata, xoffset, yoffset, xorigin, yorigin, xsize, ysize)
const char *pagesize;
const plPageData **pagedata;
double *xoffset, *yoffset;
double *xorigin, *yorigin;
double *xsize, *ysize;
#endif
{
const plPageData *local_pagedata = _pagedata;
char *viewport_pagesize, *first, *next;
char xoffset_s[32], yoffset_s[32]; /* each field should have length <=31 */
char xorigin_s[32], yorigin_s[32];
char xsize_s[32], ysize_s[32];
bool anotherfield, success;
bool got_xoffset = false, got_yoffset = false;
bool got_xorigin = false, got_yorigin = false;
bool got_xsize = false, got_ysize = false;
int i;
viewport_pagesize = (char *)_plot_xmalloc (strlen (pagesize) + 1);
strcpy (viewport_pagesize, pagesize);
first = viewport_pagesize;
next = strchr (viewport_pagesize, (int)',');
if (next)
{
anotherfield = true;
*next = '\0';
next++;
}
else
anotherfield = false;
/* try to match page type to a page type on our list */
success = false;
for (i = 0; i < NUM_PAGESIZES; i++, local_pagedata++)
if (strcasecmp (local_pagedata->name, viewport_pagesize) == 0
||
(local_pagedata->alt_name
&& strcasecmp (local_pagedata->alt_name, viewport_pagesize) == 0))
{
success = true;
break;
}
free (viewport_pagesize);
if (success)
/* matched page type, at least */
{
/* pass back pointer to page data via pointer */
*pagedata = local_pagedata;
while (anotherfield && *next) /* i.e. while there's a nonempty field */
{
first = next;
next = strchr (next, (int)',');
if (next)
{
anotherfield = true;
*next = '\0';
next++;
}
else
anotherfield = false;
/* try to parse field */
if (sscanf (first, "xoffset = %31s", xoffset_s) == 1)
got_xoffset = true;
else if (sscanf (first, "yoffset = %31s", yoffset_s) == 1)
got_yoffset = true;
else if (sscanf (first, "xorigin = %31s", xorigin_s) == 1)
got_xorigin = true;
else if (sscanf (first, "yorigin = %31s", yorigin_s) == 1)
got_yorigin = true;
else if (sscanf (first, "xsize = %31s", xsize_s) == 1)
got_xsize = true;
else if (sscanf (first, "ysize = %31s", ysize_s) == 1)
got_ysize = true;
}
/* pass back viewport size-and-location data via pointers */
{
double viewport_xsize, viewport_ysize;
double viewport_xorigin, viewport_yorigin;
double viewport_xoffset, viewport_yoffset;
/* xsize, ysize default to this page type's default */
if (!(got_xsize && _string_to_inches (xsize_s, &viewport_xsize)))
viewport_xsize = local_pagedata->default_viewport_size;
if (!(got_ysize && _string_to_inches (ysize_s, &viewport_ysize)))
viewport_ysize = local_pagedata->default_viewport_size;
/* xorigin, yorigin default to whatever is needed to center the
viewport on the page */
if (!(got_xorigin && _string_to_inches (xorigin_s, &viewport_xorigin)))
viewport_xorigin = 0.5 * (local_pagedata->xsize - viewport_xsize);
if (!(got_yorigin && _string_to_inches (yorigin_s, &viewport_yorigin)))
viewport_yorigin = 0.5 * (local_pagedata->ysize - viewport_ysize);
/* xoffset, yoffset default to zero */
if (!(got_xoffset && _string_to_inches (xoffset_s, &viewport_xoffset)))
viewport_xoffset = 0.0;
if (!(got_yoffset && _string_to_inches (yoffset_s, &viewport_yoffset)))
viewport_yoffset = 0.0;
*xsize = viewport_xsize;
*ysize = viewport_ysize;
*xorigin = viewport_xorigin;
*yorigin = viewport_yorigin;
*xoffset = viewport_xoffset;
*yoffset = viewport_yoffset;
}
}
/* indicate whether we were able to match the page type */
return success;
}
/* convert a string representing a distance measurement to inches; units
`in', `cm', `mm' are supported */
static bool
#ifdef _HAVE_PROTOS
_string_to_inches (const char *string, double *inches)
#else
_string_to_inches (string, inches)
const char *string;
double *inches;
#endif
{
double val;
char s[4];
if (sscanf (string, "%lf %3s" , &val, s) == 2)
{
if (strlen (s) > 2)
return false;
if (strcmp (s, "in") == 0)
{
*inches = val;
return true;
}
else if (strcmp (s, "cm") == 0)
{
*inches = val / 2.54;
return true;
}
else if (strcmp (s, "mm") == 0)
{
*inches = val / 25.4;
return true;
}
}
return false;
}
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