Collidoscope

#include "Config.h"

#include "cinder/Exception.h"

#include "boost/algorithm/string/trim.hpp"

using ci::DataSourceRef;

using ci::XmlTree;

using ci::loadFile;

Config::Config() :

    mAudioInputDeviceKey( "" ),

    mNumChunks(150),

    mWaveLen(2.0)

{

}

// uses Cinder api to parse configuration in XML file 

void Config::loadFromFile( std::string&& path )

{

    try {

        XmlTree doc( loadFile( path ) );

        XmlTree collidoscope = doc.getChild( "collidoscope" );

        // audio input device 

        mAudioInputDeviceKey = collidoscope.getChild( "audioInputDeviceKey" ).getValue();

        boost::trim( mAudioInputDeviceKey );

        // wave len in seconds 

        std::string waveLenStr = collidoscope.getChild("wave_len").getValue();

        boost::trim(waveLenStr);

        mWaveLen = ci::fromString<double>(waveLenStr);

        // channel for each wave 

        XmlTree waves = collidoscope.getChild( "waves" );

        for ( int i = 0; i < NUM_WAVES; i++ ){

            for ( auto &wave : waves.getChildren() ){

                int id = ci::fromString<int>( wave->getAttribute( "id" ) );

                if ( id == i ){

                    parseWave( *wave, id );

                    break;

                }

            }

        }

    }

    catch ( std::exception &e ) {

        throw ci::Exception( e.what() );

    }

}

// thows exception captured in loadFromFile 

void Config::parseWave( const XmlTree &wave, int id )

{

    // midi channel 

    std::string midiChannelStr = wave.getChild( "midiChannel" ).getValue();

    boost::trim( midiChannelStr );

    mMidiChannels[id] = ci::fromString<size_t>( midiChannelStr );

}