AutomationPath.cpp

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/*
 * Hydrogen
 * Copyright(c) 2002-2008 by Alex >Comix< Cominu [comix@users.sourceforge.net]
 * Copyright(c) 2008-2024 The hydrogen development team [hydrogen-devel@lists.sourceforge.net]
 *
 * http://www.hydrogen-music.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY, without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see https://www.gnu.org/licenses
 *
 */
 
#include <core/Basics/AutomationPath.h>
#include <core/Basics/Song.h>
#include <core/Hydrogen.h>
 
namespace H2Core
{
 
AutomationPath::AutomationPath(float min, float max, float def)
        : Object(),
          _min(min),
          _max(max),
          _def(def)
{
}
 
 
float AutomationPath::get_value(float x) const noexcept
{
        if (_points.empty()) {
                return _def;
        }
 
        auto f = _points.begin();
        if(x <= f->first) {
                return f->second;
        }
 
        auto l = _points.rbegin();
        if(x >= l->first) {
                return l->second;
        }
 
        auto i = _points.lower_bound(x);
        auto p1 = *i;
        auto p0 = *(--i);
        float x1 = p0.first;
        float y1 = p0.second;
        float x2 = p1.first;
        float y2 = p1.second;
 
        float d = (x-x1)/(x2 - x1);
 
        return y1 + (y2-y1)*d;
}
 
 
void AutomationPath::add_point(float x, float y)
{
        _points[x] = y;
        Hydrogen::get_instance()->setIsModified( true );
}
 
 
bool operator==(const AutomationPath &lhs, const AutomationPath &rhs)
{
        return lhs._min == rhs._min
                && lhs._max == rhs._max
                && lhs._def == rhs._def
                && lhs._points == rhs._points;
}
 
 
bool operator!=(const AutomationPath &lhs, const AutomationPath &rhs)
{
        return !(lhs==rhs);
}
 
QString AutomationPath::toQString( const QString& sPrefix, bool bShort ) const {
        QString s = Base::sPrintIndention;
        QString sOutput;
        if ( ! bShort ) {
                sOutput = QString( "%1[AutomationPath]\n" ).arg( sPrefix )
                        .append( QString( "%1%2min: %3\n" ).arg( sPrefix ).arg( s ).arg( _min ) )
                        .append( QString( "%1%2max: %3\n" ).arg( sPrefix ).arg( s ).arg( _max ) )
                        .append( QString( "%1%2def: %3\n" ).arg( sPrefix ).arg( s ).arg( _def ) )
                        .append( QString( "%1%2points:\n" ).arg( sPrefix ).arg( s ) );
                for ( auto pp : _points ) {
                        sOutput.append( QString( "%1%2%3 : %4\n" ).arg( sPrefix ).arg( s ).arg( pp.first ).arg( pp.second ) );
                }
        } else {
                
                sOutput = QString( "[AutomationPath]" )
                        .append( QString( " min: %1" ).arg( _min ) )
                        .append( QString( ", max: %1" ).arg( _max ) )
                        .append( QString( ", def: %1" ).arg( _def ) )
                        .append( QString( ", [points: " ) );
                for ( auto pp : _points ) {
                        sOutput.append( QString( "(%1: %4) " ).arg( pp.first ).arg( pp.second ) );
                }
                sOutput.append( "]" );
        }
        
        return sOutput;
}
 
AutomationPath::iterator AutomationPath::find(float x)
{
        const float limit = 0.5f;
 
        if (_points.empty()) {
                return _points.end();
        }
 
        auto i = _points.lower_bound(x);
 
        if (i != _points.end()) {
                if( i->first - x <= limit) {
                        return i;
                }
        }
 
        /* If there is a point before, check whether
         * it is a close match */
        if (i != _points.begin()) {
                --i;
                if( x - i->first <= limit) {
                        return i;
                }
        }
 
        return _points.end();
}
 
 
AutomationPath::iterator AutomationPath::move(iterator &in, float x, float y)
{
        _points.erase(in);
        auto rv = _points.insert(std::make_pair(x,y));
        Hydrogen::get_instance()->setIsModified( true );
        return rv.first;
}
 
 
void AutomationPath::remove_point(float x)
{
        auto it = find(x);
        if (it != _points.end()) {
                _points.erase(it);
        }
        Hydrogen::get_instance()->setIsModified( true );
}
 
} //namespace H2Core