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/*
* A framework for writing an Inkscape Live Path Effect (LPE) toy.
*
* Copyright 2009 Johan Engelen <goejendaagh@zonnet.nl>
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
*/
#include <string.h>
#include <stdint.h>
#include <toys/lpe-framework.h>
#include <2geom/sbasis-to-bezier.h>
#include <2geom/affine.h>
#include <2geom/pathvector.h>
#define LPE_CONVERSION_TOLERANCE 0.01
/**
* When the input path handles are moved, this method is called to re-execute the LPE and draw the result.
*/
void LPEToy::draw(cairo_t *cr, std::ostringstream *notify, int width, int height, bool save, std::ostringstream *timer_stream)
{
using namespace Geom;
Piecewise<D2<SBasis> > pwd2(curve_handle.asBezier());
PathVector A = Geom::path_from_piecewise( pwd2, LPE_CONVERSION_TOLERANCE);
cairo_set_line_width (cr, 2);
cairo_set_source_rgba (cr, 1., 0.0, 0., 1);
cairo_path(cr, A);
cairo_stroke(cr);
// perform the effect:
PathVector B = doEffect_path(A);
cairo_set_line_width (cr, 1);
cairo_set_source_rgba (cr, 0., 0.0, 0., 1);
cairo_path(cr, B);
cairo_stroke(cr);
Toy::draw(cr, notify, width, height, save,timer_stream);
}
/**
* Initializes the LPE toy, and sets a simple default input path.
*/
LPEToy::LPEToy(){
if(handles.empty()) {
handles.push_back(&curve_handle);
for(unsigned i = 0; i < 4; i++) {
curve_handle.push_back(150+uniform()*300,150+uniform()*300);
}
}
}
/*
* Here be the doEffect function chain: (this is copied code from Inkscape)
*/
Geom::PathVector
LPEToy::doEffect_path (Geom::PathVector const &path_in)
{
Geom::PathVector path_out;
if ( !concatenate_before_pwd2 ) {
// default behavior
for (const auto & i : path_in) {
Geom::Piecewise<Geom::D2<Geom::SBasis> > pwd2_in = i.toPwSb();
Geom::Piecewise<Geom::D2<Geom::SBasis> > pwd2_out = doEffect_pwd2(pwd2_in);
Geom::PathVector path = Geom::path_from_piecewise( pwd2_out, LPE_CONVERSION_TOLERANCE);
// add the output path vector to the already accumulated vector:
for (const auto & j : path) {
path_out.push_back(j);
}
}
} else {
// concatenate the path into possibly discontinuous pwd2
Geom::Piecewise<Geom::D2<Geom::SBasis> > pwd2_in;
for (const auto & i : path_in) {
pwd2_in.concat( i.toPwSb() );
}
Geom::Piecewise<Geom::D2<Geom::SBasis> > pwd2_out = doEffect_pwd2(pwd2_in);
path_out = Geom::path_from_piecewise( pwd2_out, LPE_CONVERSION_TOLERANCE);
}
return path_out;
}
Geom::Piecewise<Geom::D2<Geom::SBasis> >
LPEToy::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
{
// default effect does nothing
return pwd2_in;
}
/*
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=4:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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