paintComponent is not working

**spazattack** · 12-18-2009, 03:38 AM

When I want my program to repaint, it's not displaying the visualization. What's wrong with it? I'm also using midi files so I guess you can grab any midi files. I can't link you to where I got them because I'm not allowed to post links..

Java Code:

import java.applet.Applet;
import java.applet.AudioClip;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.util.*;
import java.net.*;
import java.io.*;

import javax.sound.midi.*;
import javax.swing.*;
import javax.swing.Timer;
import javax.swing.border.LineBorder;

public class Music extends Applet {

	static Music music;
	Vector notes = new Vector();
	static Sequence seq;
	Sequencer sequencer;
	Timer timer;
	int WIDTH = 800;
	int HEIGHT = 600;
	double max = 0;
	double min = HEIGHT;
	boolean[] visible;
	VolatileImage buffer;
	Image background;
	Graphics g;
	double time;
	Vector v;
	Rectangle r;
	static double zoom = 10.0;
	Color[] colors = { Color.red, Color.yellow, Color.green, Color.blue,
			Color.cyan, Color.magenta, Color.orange, Color.pink };
	private Button start = new Button("Start");
	private Button pause = new Button("Pause");
	private Button stop = new Button("Stop");
	private JComboBox midiFiles = new JComboBox(new Object[] {
			"Moonlight Sonata", "Cantina", "Brahms" });
	private AudioClip currentAudioClip;
	private AudioClip[] audioClips = new AudioClip[3];
	private int current = 0;

	/**
	 * Main method: takes midi file parameter from commandline, starts applet
	 * 
	 * @param args
	 */
	public static void main(String[] args) {

		try {
			seq = MidiSystem.getSequence(new File(args[0]));
			if (args.length > 1)
				zoom = Double.parseDouble(args[1]);
		}// try
		catch (Exception e) {
			e.printStackTrace();
			System.exit(0);
		}// catch

		music = new Music();

		final JFrame frame = new JFrame();

		frame.getContentPane().setLayout(new BorderLayout());
		frame.add(music, BorderLayout.CENTER);

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.pack();
		frame.setVisible(true);

		music.go();

	}// main
	public Music() {
		add(new Panel());



		add(start);
		add(pause);
		add(stop);
		add(midiFiles);
	}


	public void init() {
		audioClips[0] = Applet.newAudioClip(getClass().getResource(
		"MoonlightSonata3.mid"));
		audioClips[1] = Applet.newAudioClip(getClass().getResource(
		"cantina.mid"));
		audioClips[2] = Applet.newAudioClip(getClass()
				.getResource("brahms.mid"));



		start.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				try {
					if (currentAudioClip == audioClips[0]) {
						seq = MidiSystem.getSequence(new File(
						"MoonlightSonata3.mid"));
					} else if (currentAudioClip == audioClips[1]) {
						seq = MidiSystem.getSequence(new File("cantina.mid"));
					} else if (currentAudioClip == audioClips[2]) {
						seq = MidiSystem.getSequence(new File("brahms.mid"));
					}
					// currentAudioClip.play();
					music = new Music();
					music.go();
					music.everythingStart();

				} catch (InvalidMidiDataException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}

			}

		});
		pause.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				music.everythingStop();

			}

		});
		stop.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				music.everythingStop();
			}

		});
		midiFiles.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				stop();
				current = midiFiles.getSelectedIndex();
				presentMidi(current);

			}

		});

		currentAudioClip = audioClips[0];

	}

	private void presentMidi(int index) {
		midiFiles.setSelectedIndex(index);
		currentAudioClip = audioClips[index];
	}

	public void start() {

	}

	public void stop() {

	}

	/**
	 * Starts playback of created midi sequence
	 */

	public void go() {

		for (int j = 0; j < seq.getTracks().length; j++) {
			Vector v = new Vector();

			Track t = seq.getTracks()[j];
			System.out.println(t.ticks() + " " + t.size());
			RenderListener rt = new RenderListener(this);
			timer = new Timer(100, rt);
			MidiMessage m;
			ShortMessage s;
			MidiEvent e;
			Rectangle r;
			Point[] p = new Point[255];
			for (int i = 0; i < p.length; i++) {
				p[i] = new Point(-1, -1);
			}// for

			for (int i = 0; i < t.size(); i++) {
				e = t.get(i);
				m = e.getMessage();
				if (m instanceof ShortMessage) {
					s = (ShortMessage) m;

					if (s.getCommand() == 144 || s.getCommand() == 128) {
						if (p[s.getData1()].x == -1) {
							p[s.getData1()].x = (int) (e.getTick() / zoom);
						}// if
						else {
							r = new Rectangle(
									p[s.getData1()].x,
									s.getData1() * 5,
									(int) (e.getTick() / zoom - p[s.getData1()].x),
									10);

							v.add(r);
							if (r.y < min)
								min = r.y;
							if (r.y > max)
								max = r.y;

							// System.out.println("added");
							p[s.getData1()].x = -1;
						}// else
					}// if

				}// if
			}// for
			if (v.size() > 0) {
				notes.add(v);
			}// if

		}// for

		visible = new boolean[notes.size()];
		Arrays.fill(visible, true);

		try { // starts actual playback. Note that timer must be created and
			// started *before* music starts playing
			sequencer = MidiSystem.getSequencer();
			sequencer.open();
			sequencer.setSequence(seq);
			sequencer.setTempoFactor(1.0f);

			timer.start();
			sequencer.start();

		}// try
		catch (Exception e) {
			e.printStackTrace();
			System.exit(0);
		}// catch

	}// start

	public void everythingStop() {
		timer.stop();
		sequencer.stop();
	}
	public void everythingStart() {
		
		timer.start();
		sequencer.start();
	}

	class RenderListener implements ActionListener {
		Music parent;

		RenderListener(Music m) {
			parent = m;
		}

		public void actionPerformed(ActionEvent ev) {
			//repaint();
			if (sequencer == null || !sequencer.isRunning())
				return;
			time = sequencer.getTickPosition();
			time /= zoom;
			//repaint();
			parent.repaint();
			//parent.render();
		}
	}



	public class Panel extends JPanel {
		protected void paintComponent(Graphics g) {
			super.paintComponent(g);
			if (buffer == null) {
				buffer = createVolatileImage(WIDTH, HEIGHT);
				g = buffer.getGraphics();
			}// if

			g.setColor(Color.black);
			g.fillRect(0, 0, WIDTH, HEIGHT);

			for (int i = 0; i < notes.size(); i++) {
				v = (Vector) (notes.elementAt(i));
				for (int j = 0; j < v.size(); j++) {
					r = (Rectangle) (v.elementAt(j));
					if ((r.x - time) > WIDTH / 2 + 200) {
						break;
					}// if
					if ((r.x - time + r.width) < -WIDTH / 2) {
						v.removeElementAt(j);
					}// if
					else if (visible[i]) {
						if (r.x - time <= 0 && r.x - time + r.width >= 0) {
							g.setColor(Color.white);
						}// if
						else {
							g.setColor(colors[i % colors.length]);
						}// else
						g.fillOval((int) ((r.x - time) + WIDTH / 2),
								(int) (HEIGHT - r.y), (int) (r.width),
								(int) r.height);
					}// else
				}// for
			}// for

			getGraphics().drawImage(buffer, 0, 0, this);

		}
	}



	public Dimension getPreferredSize() {
		return new Dimension(WIDTH, HEIGHT);
	}

}// Music