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1 #pragma once
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2
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3 #include "cinder/gl/gl.h"
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4
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5 #include "DrawInfo.h"
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6
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7 class Oscilloscope
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8 {
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9
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10 public:
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11
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12 Oscilloscope( size_t numPoints ):
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13 mNumPoints( numPoints ),
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14 mLine( std::vector<ci::vec2>( numPoints, ci::vec2() ) )
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15 {}
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16
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17 void setPoint( int index, float audioVal, const DrawInfo &di ){
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18
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19 if ( audioVal > 1.0f ){
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20 audioVal = 1.0f;
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21 }
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22 else if ( audioVal < -1.0f ){
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23 audioVal = -1.0f;
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24 }
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25
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26 audioVal *= 0.8f;
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27 // this yRatio is for the bottom scope, the top will be drawn with a translation/4
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28 // because it's half of the half of the tier where the wave is drawn
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29 float yRatio = ((1 + audioVal) / 2.0f) * (di.getWindowHeight() / NUM_WAVES );
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30 float xRatio = index * (di.getWindowWidth() / (float)mLine.size());
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31
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32 mLine.getPoints()[index].x = float( di.flipX( int(xRatio) ) );
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33 mLine.getPoints()[index].y = float( di.flipY( int(yRatio) ) );
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34
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35 // add the missing line to reach the right of the window
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36 // indeed the scope starts from 0 to size -1 and adds xRatio
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37 // to each new point to the line from n-1 to n is missing
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38 if (index == mNumPoints - 1){
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39 xRatio += ( di.getWindowWidth() / mNumPoints );
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40 xRatio = ceil( xRatio ); // ceil because the division might left one pixel out
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41
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42 mLine.getPoints()[mNumPoints - 1].x = di.flipX( xRatio );
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43 mLine.getPoints()[mNumPoints - 1].y = di.flipY( yRatio );
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44 }
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45
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46 }
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47
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48 void draw()
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49 {
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50 ci::gl::color(1.0f, 1.0f, 1.0f);
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51 ci::gl::draw( mLine );
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52 }
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53
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54 size_t getNumPoints() const
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55 {
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56 return mNumPoints;
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57 }
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58
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59 private:
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60 size_t mNumPoints;
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61 ci::PolyLine2f mLine;
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62
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63 };
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