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/** \file
* LPE <mirror_symmetry> implementation: mirrors a path with respect to a given line.
*/
/*
* Authors:
* Maximilian Albert
* Johan Engelen
* Abhishek Sharma
*
* Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
* Copyright (C) Maximilin Albert 2008 <maximilian.albert@gmail.com>
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include <glibmm/i18n.h>
#include "live_effects/lpe-mirror_symmetry.h"
#include <sp-path.h>
#include <display/curve.h>
#include <svg/path-string.h>
#include <2geom/path.h>
#include <2geom/path-intersection.h>
#include <2geom/transforms.h>
#include <2geom/affine.h>
namespace Inkscape {
namespace LivePathEffect {
LPEMirrorSymmetry::LPEMirrorSymmetry(LivePathEffectObject *lpeobject) :
Effect(lpeobject),
discard_orig_path(_("Discard original path?"), _("Check this to only keep the mirrored part of the path"), "discard_orig_path", &wr, this, false),
joinPaths(_("Join the paths"), _("Join the resulting paths"), "joinPaths", &wr, this, true),
reflection_line(_("Reflection line:"), _("Line which serves as 'mirror' for the reflection"), "reflection_line", &wr, this, "M0,0 L1,0")
{
show_orig_path = true;
registerParameter( dynamic_cast<Parameter *>(&discard_orig_path) );
registerParameter( dynamic_cast<Parameter *>(&joinPaths) );
registerParameter( dynamic_cast<Parameter *>(&reflection_line) );
}
LPEMirrorSymmetry::~LPEMirrorSymmetry()
{
}
void
LPEMirrorSymmetry::doBeforeEffect (SPLPEItem const* lpeitem)
{
SPLPEItem * item = const_cast<SPLPEItem*>(lpeitem);
item->apply_to_clippath(item);
item->apply_to_mask(item);
}
void
LPEMirrorSymmetry::doOnApply (SPLPEItem const* lpeitem)
{
using namespace Geom;
original_bbox(lpeitem);
Point A(boundingbox_X.max(), boundingbox_Y.max());
Point B(boundingbox_X.max(), boundingbox_Y.min());
Piecewise<D2<SBasis> > rline = Piecewise<D2<SBasis> >(D2<SBasis>(Linear(A[X], B[X]), Linear(A[Y], B[Y])));
reflection_line.set_new_value(rline, true);
}
std::vector<Geom::Path>
LPEMirrorSymmetry::doEffect_path (std::vector<Geom::Path> const & path_in)
{
// Don't allow empty path parameter:
if ( reflection_line.get_pathvector().empty() ) {
return path_in;
}
std::vector<Geom::Path> path_out;
std::vector<Geom::Path> mline(reflection_line.get_pathvector());
if (!discard_orig_path && !joinPaths) {
path_out = path_in;
}
Geom::Point A(mline.front().initialPoint());
Geom::Point B(mline.back().finalPoint());
Geom::Affine m1(1.0, 0.0, 0.0, 1.0, A[0], A[1]);
double hyp = Geom::distance(A, B);
double c = (B[0] - A[0]) / hyp; // cos(alpha)
double s = (B[1] - A[1]) / hyp; // sin(alpha)
Geom::Affine m2(c, -s, s, c, 0.0, 0.0);
Geom::Affine sca(1.0, 0.0, 0.0, -1.0, 0.0, 0.0);
Geom::Affine m = m1.inverse() * m2;
m = m * sca;
m = m * m2.inverse();
m = m * m1;
if(joinPaths && !discard_orig_path){
for (Geom::PathVector::const_iterator path_it = path_in.begin();
path_it != path_in.end(); ++path_it) {
if (path_it->empty()){
continue;
}
Geom::Path original;
Geom::Path mlineExpanded;
Geom::Line lineSeparation;
lineSeparation.setPoints(mline[0].initialPoint(),mline[0].finalPoint());
Geom::Point lineStart = lineSeparation.pointAt(-100000.0);
Geom::Point lineEnd = lineSeparation.pointAt(100000.0);
mlineExpanded.start( lineStart);
mlineExpanded.appendNew<Geom::LineSegment>( lineEnd);
Geom::Crossings cs = crossings(*path_it, mlineExpanded);
double timeStart = 0.0;
//http://stackoverflow.com/questions/1560492/how-to-tell-whether-a-point-is-to-the-right-or-left-side-of-a-line
double pos = (lineEnd[Geom::X]-lineStart[Geom::X])*(path_it->initialPoint()[Geom::Y]-lineStart[Geom::Y]) - (lineEnd[Geom::Y]-lineStart[Geom::Y])*(path_it->initialPoint()[Geom::X]-lineStart[Geom::X]);
int position = (pos < 0) ? -1 : (pos > 0);
unsigned int counter = 0;
for(unsigned int i = 0; i < cs.size(); i++) {
double timeEnd = cs[i].ta;
Geom::Path portion = path_it->portion(timeStart, timeEnd);
if(position == -1 && i==0){
counter++;
}
if(counter%2!=0){
original = portion;
original.append(portion.reverse() * m, (Geom::Path::Stitching)1);
if(i!=0){
original.close();
}
path_out.push_back(original);
original.clear();
}
timeStart = timeEnd;
counter++;
}
if(cs.size()!=0 && ((cs.size()%2 == 0 && position == -1)||(cs.size()%2 != 0 && position == 1))){
Geom::Path portion = path_it->portion(timeStart, nearest_point(path_it->finalPoint(), *path_it));
original = portion.reverse();
original.append(portion * m, (Geom::Path::Stitching)1);
if (!path_it->closed()){
path_out.push_back(original);
} else {
path_out[0].append(original.reverse(), (Geom::Path::Stitching)1);
path_out[0].close();
}
original.clear();
}
if(cs.size() == 0 && position == -1){
path_out.push_back(*path_it);
path_out.push_back(*path_it * m);
}
}
}
if (!joinPaths) {
for (int i = 0; i < static_cast<int>(path_in.size()); ++i) {
path_out.push_back(path_in[i] * m);
}
}
return path_out;
}
} //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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