Collidoscope

/*

 Copyright (C) 2015  Fiore Martin

 Copyright (C) 2016  Queen Mary University of London 

 Author: Fiore Martin

 This file is part of Collidoscope.

 Collidoscope 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 3 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 <http://www.gnu.org/licenses/>.

*/

#include "Chunk.h"

#include "DrawInfo.h"

#include "cinder/gl/gl.h"

Chunk::Chunk( size_t index ) :

    mIndex( index ),

    mAudioTop(0.0f),

    mAudioBottom(0.0f)

    {}

void update( const DrawInfo& di )

{

}

void Chunk::update( const DrawInfo &di )

{

    using namespace ci;

    /* if resetting animate the chunks to nicely shrink to 0 size */

    if ( mResetting ){

        if ( mAnimate > 0.0f ){

            mAnimate -= 0.1f;

            if ( mAnimate <= 0.0f ){

                mAnimate = 0.0f;

                mResetting = false;

                mAudioTop = 0.0f;

                mAudioBottom = 0.0f;

            }

        }

    }

    /* animate makes the chunks pop nicely when they are created */

    else if ( mAnimate < 1.0f ){

        mAnimate += 0.3333f; // in three (namely 1/0.333) steps

        if ( mAnimate > 1.0f ){ // clip to one

            mAnimate = 1.0f;

        }

    }

    mX = di.flipX( 1 + (mIndex * (2 + kWidth)) ); // FIXME more efficient if it happens only once when resized 

}

void Chunk::draw( const DrawInfo& di, ci::gl::BatchRef &batch ){

    using namespace ci;

    gl::pushModelMatrix();

    const float chunkHeight = mAnimate * mAudioTop * di.getMaxChunkHeight();

    // place the chunk in the right position brings back the y of chunkHeight/2 so

    // so that after scaling the wave is still centered at the wave center 

    gl::translate( mX, di.getWaveCenterY() - ( chunkHeight / 2 ) - 1 );

    // scale according to audio amplitude 

    gl::scale( 1.0f, chunkHeight );

    batch->draw();

    gl::popModelMatrix();

}

void Chunk::drawBar( const DrawInfo& di, ci::gl::BatchRef &batch ){

    using namespace ci;

    gl::pushModelMatrix();

    const float barHeight = di.getSelectionBarHeight();

    gl::translate( mX, di.getWaveCenterY() - ( barHeight / 2 ) - 1 );

    gl::scale( 1.0f, barHeight );

    batch->draw();

    gl::popModelMatrix();

}

const float Chunk::kWidth = 7.0f;

const float Chunk::kHalfWidth = 3.5f;