Minim core | ugens | analysis |
Frequency ofMidiNote | Description Construct a Frequency from a MIDI note value. Signature
    Frequency ofMidiNote(float midiNote)
Parameters midiNote — float: a value in the range [0,127] Returns a new Frequency object Related Frequency Example
    /* frequencyExample<br/>
       is an example of using the Frequency class to easily turn keyboard input
       into the frequency of an Oscil. Simply type on the home row to change
       the pitch of the tone.
       <p>
       For more information about Minim and additional features,
       visit http://code.compartmental.net/minim/
    */

    // import everything necessary to make sound.
    import ddf.minim.*;
    import ddf.minim.ugens.*;

    // create all of the variables that will need to be accessed in
    // more than one methods (setup(), draw(), stop()).
    Minim minim;
    AudioOutput out;

    Oscil      wave;
    // keep track of the current Frequency so we can display it
    Frequency  currentFreq;

    // setup is run once at the beginning
    void setup()
    {
      // initialize the drawing window
      size(512, 200);

      // initialize the minim and out objects
      minim = new Minim(this);
      out   = minim.getLineOut();

      currentFreq = Frequency.ofPitch( "A4" );
      wave = new Oscil( currentFreq, 0.6f, Waves.TRIANGLE );

      wave.patch( out );
    }

    // draw is run many times
    void draw()
    {
      // erase the window to brown
      background( 64, 32, 0 );
      // draw using a beige stroke
      stroke( 255, 238, 192 );

      text( "Current Frequency in Hertz: " + currentFreq.asHz(), 5, 15 );
      text( "Current Frequency as MIDI note: " + currentFreq.asMidiNote(), 5, 30 );

      // draw the waveforms
      for( int i = 0; i < out.bufferSize() - 1; i++ )
      {
        // find the x position of each buffer value
        float x1  =  map( i, 0, out.bufferSize(), 0, width );
        float x2  =  map( i+1, 0, out.bufferSize(), 0, width );
        // draw a line from one buffer position to the next for both channels
        line( x1, 50 + out.left.get(i)*50, x2, 50 + out.left.get(i+1)*50);
        line( x1, 150 + out.right.get(i)*50, x2, 150 + out.right.get(i+1)*50);
      }
    }

    // change the midi note when pressing keys on the keyboard
    // we set midiNoteIn directly with the setMidiNoteIn method
    // but you could also use a Line to lerp to the next note
    // by patching it to midiNoteIn.
    void keyPressed()
    {
      if ( key == 'a' ) currentFreq = Frequency.ofPitch( "A4" );
      if ( key == 's' ) currentFreq = Frequency.ofPitch( "B4" );
      if ( key == 'd' ) currentFreq = Frequency.ofPitch( "C#5" );
      if ( key == 'f' ) currentFreq = Frequency.ofPitch( "D5" );
      if ( key == 'g' ) currentFreq = Frequency.ofPitch( "E5" );
      if ( key == 'h' ) currentFreq = Frequency.ofPitch( "F#5" );
      if ( key == 'j' ) currentFreq = Frequency.ofPitch( "G#5" );
      if ( key == 'k' ) currentFreq = Frequency.ofPitch( "A5" );
      if ( key == 'l' ) currentFreq = Frequency.ofPitch( "B5" );
      if ( key == ';' ) currentFreq = Frequency.ofPitch( "C#6" );
      if ( key == '\'') currentFreq = Frequency.ofPitch( "E6" );

      // note that there are two other static methods for constructing Frequency objects
      // currentFreq = Frequency.ofHertz( 440 );
      // currentFreq = Frequency.ofMidiNote( 69 );

      wave.setFrequency( currentFreq );
    }
Usage Web & Application