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// SPDX-License-Identifier: GPL-2.0-or-later
#define INKSCAPE_LPE_SPIRO_C
/*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "live_effects/lpe-spiro.h"
#include "display/curve.h"
#include <2geom/curves.h>
#include "helper/geom-nodetype.h"
#include "helper/geom-curves.h"
#include "live_effects/spiro.h"
// For handling un-continuous paths:
#include "message-stack.h"
#include "inkscape.h"
namespace Inkscape {
namespace LivePathEffect {
LPESpiro::LPESpiro(LivePathEffectObject *lpeobject) :
Effect(lpeobject)
{
}
LPESpiro::~LPESpiro()
= default;
void
LPESpiro::doEffect(SPCurve * curve)
{
sp_spiro_do_effect(curve);
}
void sp_spiro_do_effect(SPCurve *curve){
using Geom::X;
using Geom::Y;
// Make copy of old path as it is changed during processing
Geom::PathVector const original_pathv = curve->get_pathvector();
guint len = curve->get_segment_count() + 2;
curve->reset();
Spiro::spiro_cp *path = g_new (Spiro::spiro_cp, len);
int ip = 0;
for(const auto & path_it : original_pathv) {
if (path_it.empty())
continue;
// start of path
{
Geom::Point p = path_it.initialPoint();
path[ip].x = p[X];
path[ip].y = p[Y];
path[ip].ty = '{' ; // for closed paths, this is overwritten
ip++;
}
// midpoints
Geom::Path::const_iterator curve_it1 = path_it.begin(); // incoming curve
Geom::Path::const_iterator curve_it2 = ++(path_it.begin()); // outgoing curve
Geom::Path::const_iterator curve_endit = path_it.end_default(); // this determines when the loop has to stop
while ( curve_it2 != curve_endit )
{
/* This deals with the node between curve_it1 and curve_it2.
* Loop to end_default (so without last segment), loop ends when curve_it2 hits the end
* and then curve_it1 points to end or closing segment */
Geom::Point p = curve_it1->finalPoint();
path[ip].x = p[X];
path[ip].y = p[Y];
// Determine type of spiro node this is, determined by the tangents (angles) of the curves
// TODO: see if this can be simplified by using /helpers/geom-nodetype.cpp:get_nodetype
bool this_is_line = is_straight_curve(*curve_it1);
bool next_is_line = is_straight_curve(*curve_it2);
Geom::NodeType nodetype = Geom::get_nodetype(*curve_it1, *curve_it2);
if ( nodetype == Geom::NODE_SMOOTH || nodetype == Geom::NODE_SYMM )
{
if (this_is_line && !next_is_line) {
path[ip].ty = ']';
} else if (next_is_line && !this_is_line) {
path[ip].ty = '[';
} else {
path[ip].ty = 'c';
}
} else {
path[ip].ty = 'v';
}
++curve_it1;
++curve_it2;
ip++;
}
// add last point to the spiropath
Geom::Point p = curve_it1->finalPoint();
path[ip].x = p[X];
path[ip].y = p[Y];
if (path_it.closed()) {
// curve_it1 points to the (visually) closing segment. determine the match between first and this last segment (the closing node)
Geom::NodeType nodetype = Geom::get_nodetype(*curve_it1, path_it.front());
switch (nodetype) {
case Geom::NODE_NONE: // can't happen! but if it does, it means the path isn't closed :-)
path[ip].ty = '}';
ip++;
break;
case Geom::NODE_CUSP:
path[0].ty = path[ip].ty = 'v';
break;
case Geom::NODE_SMOOTH:
case Geom::NODE_SYMM:
path[0].ty = path[ip].ty = 'c';
break;
}
} else {
// set type to path closer
path[ip].ty = '}';
ip++;
}
// run subpath through spiro
int sp_len = ip;
Spiro::spiro_run(path, sp_len, *curve);
ip = 0;
}
g_free (path);
}
}; //namespace LivePathEffect
}; /* namespace Inkscape */
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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