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/* GnomeCanvas Bezier polyline paths & segments
*
* GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas widget. Tk is
* copyrighted by the Regents of the University of California, Sun Microsystems, and other parties.
*
* Copyright (C) 1998,1999 The Free Software Foundation
*
* Authors: Federico Mena <federico@nuclecu.unam.mx>
* Lauris Kaplinski <lauris@ariman.ee>
* Raph Levien <raph@acm.org>
* Jasper van de Gronde <th.v.d.gronde@hccnet.nl>
*/
#include <cstring>
#include <string>
#include <cstdlib>
#include <cstdio>
#include <glib/gmem.h>
#include <glib/gmessages.h>
#include <algorithm>
#include "libnr/n-art-bpath.h"
#include "libnr/nr-point-ops.h"
#include "gnome-canvas-bpath-util.h"
#include "prefs-utils.h"
static inline NR::Point distTo(GnomeCanvasBpathDef *bpd, size_t idx1, size_t idx2, unsigned int coord1=3, unsigned int coord2=3) {
NR::Point diff(bpd->bpath[idx1].c(coord1) - bpd->bpath[idx2].c(coord2));
return NR::Point(std::abs(diff[NR::X]), std::abs(diff[NR::Y]));
}
static bool isApproximatelyClosed(GnomeCanvasBpathDef *bpd) {
int const np = prefs_get_int_attribute("options.svgoutput", "numericprecision", 8);
double const precision = 5*pow(10.0, -np); // This roughly corresponds to a difference below the last significant digit
int const initial = bpd->moveto_idx;
int const current = bpd->n_bpath - 1;
int const previous = bpd->n_bpath - 2;
NR::Point distToPrev(distTo(bpd, current, previous));
NR::Point distToInit(distTo(bpd, current, initial));
// NOTE: It would be better to determine the uncertainty while parsing, in rsvg_parse_path_data, but this seems to perform reasonably well
return
distToInit[NR::X] <= distToPrev[NR::X]*precision &&
distToInit[NR::Y] <= distToPrev[NR::Y]*precision;
}
GnomeCanvasBpathDef *
gnome_canvas_bpath_def_new (void)
{
GnomeCanvasBpathDef *bpd;
bpd = g_new (GnomeCanvasBpathDef, 1);
bpd->n_bpath = 0;
bpd->n_bpath_max = 16;
bpd->moveto_idx = -1;
bpd->bpath = g_new (NArtBpath, bpd->n_bpath_max);
bpd->ref_count = 1;
return bpd;
}
GnomeCanvasBpathDef *
gnome_canvas_bpath_def_new_from (NArtBpath *path)
{
GnomeCanvasBpathDef *bpd;
int i;
g_return_val_if_fail (path != NULL, NULL);
bpd = g_new (GnomeCanvasBpathDef, 1);
for (i = 0; path [i].code != NR_END; i++)
;
bpd->n_bpath = i;
bpd->n_bpath_max = i;
bpd->moveto_idx = -1;
bpd->ref_count = 1;
bpd->bpath = g_new (NArtBpath, i);
memcpy (bpd->bpath, path, i * sizeof (NArtBpath));
return bpd;
}
GnomeCanvasBpathDef *
gnome_canvas_bpath_def_ref (GnomeCanvasBpathDef *bpd)
{
g_return_val_if_fail (bpd != NULL, NULL);
bpd->ref_count += 1;
return bpd;
}
void
gnome_canvas_bpath_def_free (GnomeCanvasBpathDef *bpd)
{
g_return_if_fail (bpd != NULL);
bpd->ref_count -= 1;
if (bpd->ref_count == 0) {
g_free (bpd->bpath);
g_free (bpd);
}
}
void
gnome_canvas_bpath_def_moveto (GnomeCanvasBpathDef *bpd, double x, double y)
{
NArtBpath *bpath;
int n_bpath;
g_return_if_fail (bpd != NULL);
n_bpath = bpd->n_bpath++;
if (n_bpath == bpd->n_bpath_max)
bpd->bpath = (NArtBpath*)g_realloc (bpd->bpath,
(bpd->n_bpath_max <<= 1) * sizeof (NArtBpath));
bpath = bpd->bpath;
bpath[n_bpath].code = NR_MOVETO_OPEN;
bpath[n_bpath].x3 = x;
bpath[n_bpath].y3 = y;
bpd->moveto_idx = n_bpath;
}
void
gnome_canvas_bpath_def_lineto (GnomeCanvasBpathDef *bpd, double x, double y)
{
NArtBpath *bpath;
int n_bpath;
g_return_if_fail (bpd != NULL);
g_return_if_fail (bpd->moveto_idx >= 0);
n_bpath = bpd->n_bpath++;
if (n_bpath == bpd->n_bpath_max)
bpd->bpath = (NArtBpath*)g_realloc (bpd->bpath,
(bpd->n_bpath_max <<= 1) * sizeof (NArtBpath));
bpath = bpd->bpath;
bpath[n_bpath].code = NR_LINETO;
bpath[n_bpath].x3 = x;
bpath[n_bpath].y3 = y;
}
void
gnome_canvas_bpath_def_curveto (GnomeCanvasBpathDef *bpd, double x1, double y1, double x2, double y2, double x3, double y3)
{
NArtBpath *bpath;
int n_bpath;
g_return_if_fail (bpd != NULL);
g_return_if_fail (bpd->moveto_idx >= 0);
n_bpath = bpd->n_bpath++;
if (n_bpath == bpd->n_bpath_max)
bpd->bpath = (NArtBpath*)g_realloc (bpd->bpath,
(bpd->n_bpath_max <<= 1) * sizeof (NArtBpath));
bpath = bpd->bpath;
bpath[n_bpath].code = NR_CURVETO;
bpath[n_bpath].x1 = x1;
bpath[n_bpath].y1 = y1;
bpath[n_bpath].x2 = x2;
bpath[n_bpath].y2 = y2;
bpath[n_bpath].x3 = x3;
bpath[n_bpath].y3 = y3;
}
void
gnome_canvas_bpath_def_closepath (GnomeCanvasBpathDef *bpd)
{
NArtBpath *bpath;
int n_bpath;
g_return_if_fail (bpd != NULL);
g_return_if_fail (bpd->moveto_idx >= 0);
g_return_if_fail (bpd->n_bpath > 0);
bpath = bpd->bpath;
n_bpath = bpd->n_bpath;
/* Add closing vector if we need it. */
if (!isApproximatelyClosed(bpd)) {
gnome_canvas_bpath_def_lineto (bpd, bpath[bpd->moveto_idx].x3,
bpath[bpd->moveto_idx].y3);
bpath = bpd->bpath;
} else {
// If it is approximately closed we close it here to prevent internal logic to fail.
// In addition it is probably better to continue working with this end point, as it
// is probably more precise than the original.
bpath[n_bpath-1].x3 = bpath[bpd->moveto_idx].x3;
bpath[n_bpath-1].y3 = bpath[bpd->moveto_idx].y3;
}
bpath[bpd->moveto_idx].code = NR_MOVETO;
bpd->moveto_idx = -1;
}
void
gnome_canvas_bpath_def_art_finish (GnomeCanvasBpathDef *bpd)
{
int n_bpath;
g_return_if_fail (bpd != NULL);
n_bpath = bpd->n_bpath++;
if (n_bpath == bpd->n_bpath_max)
bpd->bpath = (NArtBpath*)g_realloc (bpd->bpath,
(bpd->n_bpath_max <<= 1) * sizeof (NArtBpath));
bpd->bpath [n_bpath].code = NR_END;
}
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