/*
 * WaveApplet.java
 *
 * Created on 2008/06/12, 12:38
 */

package info.noip.arton.wave;

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.util.Arrays;
import javax.sound.sampled.*;
import javax.swing.JOptionPane;

/**
 *
 * @author  arton
 */
public class WaveApplet extends javax.swing.JApplet {
    static final int RES = 80;
    static final int RATE = 16000;
    static final int QUANT_BITS = Short.SIZE;
    static final int QUANT = 2;
    
    boolean mouseListening;
    short[] wave = new short[RES];
    AudioFormat format;
    /** Initializes the applet WaveApplet */
    public void init() {
        try {
            java.awt.EventQueue.invokeAndWait(new Runnable() {
                public void run() {
                    initComponents();
                }
            });
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        Arrays.fill(wave, 1, RES / QUANT - 1, Short.MAX_VALUE);
        Arrays.fill(wave, RES / QUANT + 1, wave.length - 1, Short.MIN_VALUE);
        format = new AudioFormat(RATE, QUANT_BITS, 1, true, true);        
    }

    /** This method is called from within the init() method to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        playButton = new javax.swing.JToggleButton();
        waveCanvas = new WaveCanvas();

        playButton.setText("Play");
        playButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                playButtonActionPerformed(evt);
            }
        });

        waveCanvas.setBackground(new java.awt.Color(0, 0, 0));
        waveCanvas.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mousePressed(java.awt.event.MouseEvent evt) {
                waveCanvasMousePressed(evt);
            }
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                waveCanvasMouseReleased(evt);
            }
        });
        waveCanvas.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {
            public void mouseDragged(java.awt.event.MouseEvent evt) {
                waveCanvasMouseDragged(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(waveCanvas, javax.swing.GroupLayout.DEFAULT_SIZE, 321, Short.MAX_VALUE)
                    .addComponent(playButton))
                .addContainerGap(22, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(playButton)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(waveCanvas, javax.swing.GroupLayout.PREFERRED_SIZE, 129, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(130, Short.MAX_VALUE))
        );
    }// </editor-fold>//GEN-END:initComponents

    byte[] reformat(double dbl) {
        int cnt = (int)(wave.length * dbl);
        byte[] buff = new byte[cnt * 2];
        for (int i = 0; i < cnt; i++) {
            int index = (int)(i / dbl);
            if (index >= wave.length) {
                index = wave.length - 1;
            }
            buff[i * 2] = (byte)(wave[index] >> Byte.SIZE);
            buff[i * 2 + 1] = (byte)wave[index];
        }
        return buff;
    }

    static final double[] PICS = { 1, 1.2, 1.5, 2 };
    void play() throws LineUnavailableException {
        byte[][] buff = new byte[PICS.length][];
        for (int i = 0; i < PICS.length; i++) {
            buff[i] = reformat(PICS[i]);
        }
        DataLine.Info info = new DataLine.Info(SourceDataLine.class, format);
        SourceDataLine line = (SourceDataLine)AudioSystem.getLine(info);
        line.open(format);
        try {
            line.start();
            for (int i = 0; i < buff.length; i++) {
                for (int j = 0; j < (int)(100 / PICS[i]); j++) {
                    line.write(buff[i], 0, buff[i].length);
                }
            }
            line.drain();
            line.stop();
        } finally {
            line.close();
        }
    }
    
    class WaveCanvas extends Canvas {
        public void paint(Graphics g) {
            g.setColor(Color.WHITE);
            int center_y = getHeight() / 2;
            g.drawLine(0, center_y, getWidth(), center_y);
            g.setColor(Color.GREEN);
            double xoff = getWidth() / (double)wave.length;
            double yoff = getHeight() / (double)0xffff;
            int oldy = center_y;
            for (int i = 1; i < wave.length; i++) {
                int x = (int)(i * xoff);
                int y = center_y - (int) (wave[i] * yoff);
                g.drawLine((int)((i - 1) * xoff), oldy, (int)(i * xoff), y);
                oldy = y;
            }
        }
        
        void repoint(int mousex, int mousey) {
            double xoff = wave.length / (double)getWidth();
            double yoff = 0xffff / (double) getHeight();
            int mx = (int) (xoff * mousex);
            if (mx >= 0 && mx < wave.length) {
                wave[mx] = (short) (Short.MAX_VALUE - mousey * yoff);
                repaint();
            }            
        }
    }
private void playButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_playButtonActionPerformed
    try {
        play();
    } catch (Exception e) {
        JOptionPane.showMessageDialog(this, e, "error", JOptionPane.OK_OPTION);
    }
    playButton.setSelected(false);
}//GEN-LAST:event_playButtonActionPerformed

private void waveCanvasMousePressed(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_waveCanvasMousePressed
    mouseListening = true;
}//GEN-LAST:event_waveCanvasMousePressed

private void waveCanvasMouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_waveCanvasMouseReleased
    mouseListening = false;
}//GEN-LAST:event_waveCanvasMouseReleased

private void waveCanvasMouseDragged(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_waveCanvasMouseDragged
    if (mouseListening) {
        ((WaveCanvas)waveCanvas).repoint(evt.getX(), evt.getY());
    }
}//GEN-LAST:event_waveCanvasMouseDragged


    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JToggleButton playButton;
    private java.awt.Canvas waveCanvas;
    // End of variables declaration//GEN-END:variables

}