Collidoscope

#pragma once

#include "cinder/app/App.h"

#include "cinder/gl/gl.h"

#include "cinder/gl/Batch.h"

#include "Chunk.h"

#include "DrawInfo.h"

#ifdef USE_PARTICLES

#include "ParticleController.h"

#endif 

#include "cinder/Color.h"

#include "cinder/PolyLine.h"

#include "cinder/Rand.h"

#include <vector>

#include <map>

class DrawInfo;

typedef int SynthID;

using ci::ivec2;

using ci::vec2;

using ci::Color;

using ci::ColorA;

/**

 * A Cursor is the white thingy that loops through the selection when Collidoscope is played.

 */ 

struct Cursor {

    static const int kNoPosition = -100;

    int pos;

    double lastUpdate;

};

/**

 * Collidoscope's graphical wave 

 *

 */ 

class Wave

{

        friend class ParticleController;

public:

    /**

     * The selection of the wave that is controlled by the big horizontal knob

     *

     */ 

        class Selection {

        public:

        Selection( Wave * w, Color color );

        /** Sets the start of selection. start is the index of the first chunk of the selection  */

        void setStart( size_t start );

        /** Sets the size of selection. size is the number of chunks the selection is made of */

                void setSize( size_t size );

        /** Particle spread is used to calculate the size of the cloud of particles */

        void inline setParticleSpread( float spread ){

            mParticleSpread = spread;

                }

                size_t getStart(void) const { return mSelectionStart; }

        size_t getEnd(void) const { return mSelectionEnd; }

                size_t inline getSize(void) const { 

                        if (mNull)

                                return 0;

                        else

                                return 1 + mSelectionEnd - mSelectionStart; 

                }

                float inline  getParticleSpread() const { return mParticleSpread; }

        /** When selection is null no selection is showed on the wave */

                inline void setToNull(){

            mParticleSpread = 1.0f;

                        mNull = true;

                }

                inline bool isNull() const{

                        return mNull;

                }

                inline const Color & getColor() const{

                        return mColor;

                }

    private:

        size_t mSelectionStart;

        size_t mSelectionEnd;

        float mParticleSpread;

        bool mNull = true;

        Color mColor;

        Wave * mWave;

        }; // class Selection

#ifdef USE_PARTICLES

        ParticleController mParticleController;

#endif 

        /* Maps id of the synth to cursor. There is one cursor for each Synth being played */

        std::map < SynthID, Cursor > mCursors;

    /** Holds the positions of the cursor, namely on which chunk the cursor is currently */

        std::vector<int> mCursorsPos;

public:

    // value used to identify the loop for cursor position 

    static const int kLoopNote = -1;

        static const cinder::Color CURSOR_CLR;

        /* must be in sync with supercollider durationFactor ControlSpec max */

        static const int MAX_DURATION = 8;

#ifdef USE_PARTICLES

        static const int PARTICLESIZE_COEFF = 40;

#endif

    /** Resetting a wave makes it shrink until it disappears. Each time a new sample is recorder the wave is reset

     *  \param onlyChunks if false the selection is also set to null, if true only the chunks are reset

     */

        void reset(bool onlyChunks);

    /** sets top and bottom values for the chunk. 

     * \a bottom and \a top are in audio coordinates [-1.0, 1.0]

     */

        void setChunk(size_t index, float bottom, float top);

        const Chunk & getChunk(size_t index);

    /** places the cursor on the wave. Every cursor is associated to a synth voice of the audio engine. 

     *  The synth id identifies uniquely the cursor in the internal map of the wave.

     *  If the cursor doesn't exist it is created */

    inline void setCursorPos( SynthID id, int pos, const DrawInfo& di ){

            Cursor & cursor = mCursors[id];

            cursor.pos = pos;

            cursor.lastUpdate = ci::app::getElapsedSeconds();

#ifdef USE_PARTICLES

            // The idea is that, if the duration is greater than 1.0, the cursor continues in form of particles

            // The smaller the selection the more particles; the bigger the duration the more particles 

            if (mSelection.getParticleSpread() > 1.0f){

                    /* amountCoeff ranges from 1/8 to 1 */

            const float amountCoeff = (mSelection.getParticleSpread() / MAX_DURATION);

            /* get radom point within seleciton as center of the particle */

            vec2 centrePoint; // was former getRandomPoint

            const int randomChunkIndex = ci::Rand::randInt(mSelection.getStart(), mSelection.getEnd() );

            centrePoint.x = di.flipX( 1 + (randomChunkIndex * (2 + Chunk::kWidth)) + Chunk::kWidth / 2 );

            centrePoint.y = di.flipY( di.audioToHeigt(0.0) );

            const float wavePixelLen = mNumChunks * ( 2 + Chunk::kWidth);

                    centrePoint.x *= float(di.getWindowWidth()) / wavePixelLen;

                    mParticleController.addParticles(

                std::max( 1, (int)(amountCoeff * ParticleController::kMaxParticleAdd * mFilterCoeff) ), // amount of particles to add 

                            centrePoint,

                mSelection.getParticleSpread() * PARTICLESIZE_COEFF   // size of the cloud 

                            );

            }

#endif

        }

    void update( double secondsPerChunk, const DrawInfo& di );

    void removeCursor( SynthID id ) { mCursors.erase( id ); }

    /** Sets the transparency of this wave. \a alpha ranges from 0 to 1 */

        inline void setselectionAlpha(float alpha){ mFilterCoeff = alpha;}

    void draw( const DrawInfo& di );

        Selection& getSelection() { return mSelection; };

        size_t getSize() const{ return mChunks.size();  }

        void setScopePoint(int index, float audioVal);

    Wave( size_t numChunks, Color selectionColor );

    /** no copies */

    Wave( const Wave &copy ) = delete;

    Wave & operator=(const Wave &copy) = delete;

private:

    const size_t mNumChunks;

    std::vector<Chunk> mChunks;

    Selection mSelection;

    cinder::Color mColor;

    float mFilterCoeff;

    // cinder gl batch for batch drawing 

    ci::gl::BatchRef mChunkBatch;

};