comparison CollidoscopeApp/include/Oscilloscope.h @ 7:a4a336624f5a

added some comments
DrawInfo dependency from NUM_WAVES

         else if ( audioVal < -1.0f ){
             audioVal = -1.0f;
         }
 
         audioVal *= 0.8f;
-        // this yRatio is for the bottom scope, the top will be drawn with a translation/4
-        // because it's half of the half of the tier where the wave is drawn  
+        // map audio val from [-1.0, 1.0] to [0.0, 1.0]
+        // then map the value obtained to the height of the wave tier ( window height / NUM_WAVES ) 
         float yRatio = ((1 + audioVal) / 2.0f) * (di.getWindowHeight() / NUM_WAVES );
         float xRatio = index * (di.getWindowWidth() / (float)mLine.size());
 
+        // this flips the coordinates for the second wave 
         mLine.getPoints()[index].x = float( di.flipX( int(xRatio) ) );
         mLine.getPoints()[index].y = float( di.flipY( int(yRatio) ) );
 
         // add the missing line to reach the right of the window
         // indeed the scope starts from 0 to size -1 and adds xRatio