Collidoscope

#pragma once

#include "cinder/Area.h"

/**

 * The DrawInfo class holds size information for drawing the waves in the screen. 

 * Every time the screen is resized the draw info is updated with the new information about the window size.

 *

 * Every wave has its own drawInfo.

 *

 */ 

class DrawInfo

{

public:

    /**

     * Constructor. Takes the index of the wave as argument.

     */ 

    DrawInfo( size_t waveIndex ):

        mWaveIndex( waveIndex ),

        mWindowWidth(0),

        mWindowHeight(0),

        mSelectionBarHeight(0),

        mShrinkFactor(1)

    {}

    /**

     * Reset this DrawInfo using the new bounding area for the wave.  \a shrinkFactor 

     * makes the wave shrink on the y axis with respect to the area. A factor 1 makes the wave as big as the area, whereas a factor >1 makes it shrink.

     */ 

    void reset( const ci::Area &bounds, float shrinkFactor )

    {

        mWindowWidth = bounds.getWidth();

        mWindowHeight = bounds.getHeight();

        mSelectionBarHeight = mWindowHeight / NUM_WAVES;

        mShrinkFactor = shrinkFactor;

    }

    /**

     * Maps a value in the audio space [-1.0, 1.0] to a position on the y axis of this DrawInf's bounding area.

     *

     */ 

        float audioToHeigt(float audioSample) const {

        /* clip into range [-1.1] */

        if (audioSample < -1.0f) {

            audioSample = -1.0f;

        }

        else if ( audioSample > 1.0f ){

            audioSample = 1.0f;

        }

        /* map from [-1,1] to [0,1] */

                float ratio = (audioSample - (-1.0f)) * 0.5f; // 2 = 1 - (-1) 

                /* get bottom and add the scaled height */

        return ratio * mSelectionBarHeight; //remove  bounds.getY1() bound only needed for size of tier

        }

    float getMaxChunkHeight() const 

    {

        return mSelectionBarHeight * mShrinkFactor;

    }

    float getSelectionBarHeight() const

    {

        return mSelectionBarHeight;

    }

    /**

     * Returns the center position on the y axis of this DrawInfo's the bounding area. 

     */ 

    int32_t getWaveCenterY() const

    {

        if ( mWaveIndex == 0 )

            return mWindowHeight * 0.75f + 1;

        else

            return mWindowHeight / (NUM_WAVES * 2);

    }

    /**

     * Flips y according to the index of the wave. It is needed because the second wave in collidoscope is upside down from the orientation oftthe screen.

     */ 

        int flipY(int y) const 

    {

        if ( mWaveIndex == 0)

                    return mWindowHeight - y;

        else

            return y;

        }

    /**

     * Returns x. not used at he moment.

     *

     */ 

        int flipX(int x) const

    {

        return x;

        }

    // how much the wave is shrunk on the y axis with respect to the wave's tier 

    float getShrinkFactor() const 

    {

        return mShrinkFactor;

    }

    int32_t getWindowWidth() const

    {

        return mWindowWidth;

    }

    int32_t getWindowHeight() const

    {

        return mWindowHeight;

    }

    /**

     * Draw infos cannot be copied and should be passed as const reference.

     */ 

    DrawInfo( const DrawInfo &original ) = delete;

    DrawInfo & operator=( const DrawInfo &original ) = delete;

private:

    const size_t mWaveIndex;

    int32_t mWindowHeight;

    int32_t mWindowWidth;

    int32_t mSelectionBarHeight;

    float mShrinkFactor;

};