MiniMusicPlayer3.java

import javax.sound.midi.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;

public class MiniMusicPlayer3{

	static JFrame f = new JFrame("My First Music Video");
	static MyDrawPanel ml;


	public static void main(String[] args){
		MiniMusicPlayer3 mini = new MiniMusicPlayer3();
		mini.go();
	}

	public void setUpGui(){
		ml = new MyDrawPanel();
		f.setContentPane(ml);
		f.setBounds(30,30,300,300);
		f.setVisible(true);
	}

	public void go(){
		setUpGui();
		try{
			Sequencer sequencer = MidiSystem.getSequencer();
			sequencer.open();

			sequencer.addControllerEventListener(ml,new int[] {127});

			Sequence seq = new Sequence(Sequence.PPQ,4);
			Track track = seq.createTrack();

			int r = 0;
			for(int i = 5; i < 60; i += 4){
				r = (int) ((Math.random() * 50) + 1);
				track.add(makeEvent(144,1,r,100,i));
				track.add(makeEvent(1176,1,127,0,i));
				track.add(makeEvent(128,1,r,100, i+2));
			}

			sequencer.setSequence(seq);
			sequencer.setTempoInBPM(120);
			sequencer.start();
		}catch(Exception ex){ex.printStackTrace();}
	}

	public  MidiEvent makeEvent(int comd, int chan, int one, int two, int tick){
		MidiEvent event = null;
		try{
			ShortMessage a = new ShortMessage();
			a.setMessage(comd, chan, one, two);
			event = new MidiEvent(a,tick);
		}catch(Exception e){ }
		return event;
	}

 	class MyDrawPanel extends JPanel implements ControllerEventListener{
 		boolean mag = false;

 		public void controlChange(ShortMessage event){
 			mag = true;
 			repaint();
 		}

 		public void paintComponent(Graphics g){
 			if(mag){
 				Graphics2D g2 = (Graphics2D) g;
 				
 				int r = (int) (Math.random() * 250);
 				int gr = (int) (Math.random() * 250);
 				int b = (int) (Math.random() * 250);

 				g.setColor(new Color(r,gr,b));

 				int ht = (int) (Math.random() * 120 +10);
 				int width = (int) (Math.random() * 120 +10);
 				int x = (int) (Math.random() * 40 +10);
 				int y = (int) (Math.random() * 40 +10);

 				g.fillRect(x,y,ht,width);
 				mag = false;
 			}
 		}
 	}
}