view CollidoscopeApp/include/Chunk.h @ 18:f1ff1a81be20 tip

Changed licenses names.
Fixed one comment and usage text in CollidoscopeApp.cpp.

/*

 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/>.

*/


#pragma once

#include "cinder/Color.h"
#include "cinder/gl/Batch.h"

class DrawInfo;

/**
 *
 * A chunk of audio in Collidoscope low-fi visual wave. 
 *
 * The visual wave of Collidoscope is made out of a number of bars that mimic, in a low-fi fashion, the typical waveform-based representation of audio.
 * A Chunk is one of the bars of the visual wave. 
 *
 */

class Chunk
{

public:

    const static float kWidth;
    const static float kHalfWidth;

    /**
     * Constructor, takes as argument the index of this chunk in the wave that contains it
     */ 
    Chunk( size_t index );

    /**
     * Sets the top value of this chunk. The value is passed in audio coordinates : [-1.0, 1.0]
     */
    void inline setTop(float t) { mAudioTop = t; mAnimate = 0.0f; mResetting = false; /* startes the animation to crate a chunk */ }
    /**
     * Sets the bottom value of this chunk. The value is passed in audio coordinates : [-1.0, 1.0]
     */
    void inline setBottom(float b) { mAudioBottom = b; mAnimate = 0.0f; mResetting = false; }
    /**
     * Get the top value of this chunk. The value is returned in audio coordinates : [-1.0, 1.0]
     */
    float inline getTop() const { return mAudioTop; }
    /**
     * Get the bottom value of this chunk. The value is returned in audio coordinates : [-1.0, 1.0]
     */
    float inline getBottom() const { return mAudioBottom; }

    /**
     * Reset this chunks. When a chunk is reset, it starts shrinking until it disappears or setTop/setBottom are called again
     *
     */ 
    void reset(){
        mResetting = true;
    }

    /**
     * Called in the graphic loop. It update this chunk. 
     */ 
    void update( const DrawInfo& di );

    /**
     * Called in the graphic loop. It draws this chunk. 
     */ 
    void draw( const DrawInfo& di, ci::gl::BatchRef &batch );

    /**
     * Called in the graphic loop. It draws this chunk all the way to the bottom of the screen. 
     * This method is called when the chunk is the first or last in a selection. 
     */ 
    void drawBar( const DrawInfo& di, ci::gl::BatchRef &batch );

    /**
     * Informs this chunk that it's the first chunk of the selection.
     */ 
    void setAsSelectionStart(bool start){
        isSelectionStart = start;
    }

    /**
     * Informs this chunk that it's the last chunk of the selection.
     */ 
    void setAsSelectionEnd(bool end){
        isSelectionEnd = end;
    }

private:

    float mAudioTop;
    float mAudioBottom;

    float mX;

    float mAnimate = 1.0;
    int mIndex;

    bool isSelectionStart = false;
    bool isSelectionEnd = false;

    bool mResetting = false;

};