f@5: /*
f@5: 
f@5:  Copyright (C) 2016  Queen Mary University of London 
f@5:  Author: Fiore Martin
f@5: 
f@5:  This file is part of Collidoscope.
f@5:  
f@5:  Collidoscope is free software: you can redistribute it and/or modify
f@5:  it under the terms of the GNU General Public License as published by
f@5:  the Free Software Foundation, either version 3 of the License, or
f@5:  (at your option) any later version.
f@5: 
f@5:  This program is distributed in the hope that it will be useful,
f@5:  but WITHOUT ANY WARRANTY; without even the implied warranty of
f@5:  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
f@5:  GNU General Public License for more details.
f@5: 
f@5:  You should have received a copy of the GNU General Public License
f@5:  along with this program.  If not, see <http://www.gnu.org/licenses/>.
f@5: */
f@5: 
f@0: #pragma once
f@0: 
f@0: #include "cinder/gl/gl.h"
f@0: 
f@0: #include "DrawInfo.h"
f@0: 
f@2: 
f@2: 
f@2: /**
f@2:  * The oscilloscope that oscillates when Collidoscope is played 
f@2:  */ 
f@0: class Oscilloscope
f@0: {
f@0: 
f@0: public:
f@0: 
f@2:     /**
f@2:      * Constructor, accepts as argument the number of points that make up the oscilloscope line 
f@2:      */ 
f@0:     Oscilloscope( size_t numPoints ):
f@0:         mNumPoints( numPoints ),
f@0:         mLine( std::vector<ci::vec2>( numPoints, ci::vec2() ) )
f@0:         {}
f@0: 
f@2:     /**
f@16:      * Sets the value of a point of the oscilloscope. The value is passed in audio coordinates [-1.0, 1.0].
f@16:      * A reference to DrawInfo is passed to calculate the graphic coordinate of the point based on the audio values passed. 
f@2:      */ 
f@0:     void  setPoint( int index, float audioVal, const DrawInfo &di ){
f@0: 
f@0:         if ( audioVal > 1.0f ){
f@0:             audioVal = 1.0f;
f@0:         }
f@0:         else if ( audioVal < -1.0f ){
f@0:             audioVal = -1.0f;
f@0:         }
f@0: 
f@0:         audioVal *= 0.8f;
f@7:         // map audio val from [-1.0, 1.0] to [0.0, 1.0]
f@7:         // then map the value obtained to the height of the wave tier ( window height / NUM_WAVES ) 
f@0:         float yRatio = ((1 + audioVal) / 2.0f) * (di.getWindowHeight() / NUM_WAVES );
f@0:         float xRatio = index * (di.getWindowWidth() / (float)mLine.size());
f@0: 
f@7:         // this flips the coordinates for the second wave 
f@0:         mLine.getPoints()[index].x = float( di.flipX( int(xRatio) ) );
f@0:         mLine.getPoints()[index].y = float( di.flipY( int(yRatio) ) );
f@0: 
f@16:         // add the missing line to reach the right of the window.
f@16:         // Indeed, the scope starts from 0 to size-1 and adds xRatio
f@16:         // to each new point. The line from n-1 to n is therefore missing.
f@0:         if (index == mNumPoints - 1){
f@0:             xRatio += ( di.getWindowWidth() / mNumPoints );
f@0:             xRatio = ceil( xRatio ); // ceil because the division might left one pixel out
f@0: 
f@0:             mLine.getPoints()[mNumPoints - 1].x = di.flipX( xRatio ); 
f@0:             mLine.getPoints()[mNumPoints - 1].y = di.flipY( yRatio );
f@0:         }
f@0: 
f@0:     }
f@0: 
f@2:     /**
f@2:      * Draws this oscilloscope as a cinder::PolyLine2f
f@2:      */ 
f@0:     void draw()
f@0:     {
f@0:         ci::gl::color(1.0f, 1.0f, 1.0f);
f@0:         ci::gl::draw( mLine );
f@0:     }
f@0: 
f@0:     size_t getNumPoints() const
f@0:     {
f@0:         return mNumPoints;
f@0:     }
f@0: 
f@0: private:
f@0:     size_t mNumPoints;
f@0:     ci::PolyLine2f  mLine;
f@0: 
f@0: };