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1 /*
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2
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3 Copyright (C) 2016 Queen Mary University of London
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4 Author: Fiore Martin
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5
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6 This file is part of Collidoscope.
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7
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8 Collidoscope is free software: you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation, either version 3 of the License, or
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11 (at your option) any later version.
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12
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13 This program is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #pragma once
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23
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24 #include "cinder/gl/gl.h"
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25
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26 #include "DrawInfo.h"
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27
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28
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29
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30 /**
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31 * The oscilloscope that oscillates when Collidoscope is played
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32 */
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33 class Oscilloscope
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34 {
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35
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36 public:
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37
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38 /**
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39 * Constructor, accepts as argument the number of points that make up the oscilloscope line
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40 */
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41 Oscilloscope( size_t numPoints ):
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42 mNumPoints( numPoints ),
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43 mLine( std::vector<ci::vec2>( numPoints, ci::vec2() ) )
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44 {}
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45
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46 /**
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47 * Sets the value of a point of the oscilloscope. The value is passed in audio coordinates [-1.0, 1.0].
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48 * A reference to DrawInfo is passed to calculate the graphic coordinate of the point based on the audio values passed.
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49 */
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50 void setPoint( int index, float audioVal, const DrawInfo &di ){
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51
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52 if ( audioVal > 1.0f ){
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53 audioVal = 1.0f;
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54 }
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55 else if ( audioVal < -1.0f ){
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56 audioVal = -1.0f;
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57 }
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58
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59 audioVal *= 0.8f;
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60 // map audio val from [-1.0, 1.0] to [0.0, 1.0]
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61 // then map the value obtained to the height of the wave tier ( window height / NUM_WAVES )
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62 float yRatio = ((1 + audioVal) / 2.0f) * (di.getWindowHeight() / NUM_WAVES );
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63 float xRatio = index * (di.getWindowWidth() / (float)mLine.size());
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64
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65 // this flips the coordinates for the second wave
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66 mLine.getPoints()[index].x = float( di.flipX( int(xRatio) ) );
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67 mLine.getPoints()[index].y = float( di.flipY( int(yRatio) ) );
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68
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69 // add the missing line to reach the right of the window.
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70 // Indeed, the scope starts from 0 to size-1 and adds xRatio
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71 // to each new point. The line from n-1 to n is therefore missing.
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72 if (index == mNumPoints - 1){
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73 xRatio += ( di.getWindowWidth() / mNumPoints );
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74 xRatio = ceil( xRatio ); // ceil because the division might left one pixel out
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75
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76 mLine.getPoints()[mNumPoints - 1].x = di.flipX( xRatio );
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77 mLine.getPoints()[mNumPoints - 1].y = di.flipY( yRatio );
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78 }
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79
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80 }
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81
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82 /**
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83 * Draws this oscilloscope as a cinder::PolyLine2f
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84 */
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85 void draw()
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86 {
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87 ci::gl::color(1.0f, 1.0f, 1.0f);
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88 ci::gl::draw( mLine );
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89 }
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90
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91 size_t getNumPoints() const
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92 {
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93 return mNumPoints;
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94 }
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95
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96 private:
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97 size_t mNumPoints;
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98 ci::PolyLine2f mLine;
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99
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100 };
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