3DPMaze - RunUI

import java.awt.event.*;
import javax.swing.filechooser.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import javax.imageio.*;
import java.awt.image.*;
import java.awt.Graphics;
import java.awt.Dimension;

/*
 * This class handles the UI and allows
 * the user to input an image and control
 * the rest of the algorithm.
 * */

public class RunUI extends JFrame implements ActionListener, ChangeListener {

  public String stl;

  JButton startButton, saveButton;
  JTextField percentField;
  JFileChooser fc;
  JFrame f;
  JPanel panel;
  JLabel pic, widthLabel, heightLabel, logLabel;
  JSlider widthSlider, heightSlider;
  File currentFile;
  FrameImage mazePic;
  boolean fileOpen = false;

  public RunUI() {
    fc = new JFileChooser();
    FileNameExtensionFilter filter = new FileNameExtensionFilter(".stl (STL Files)", "stl");
    fc.setFileFilter(filter);
    initializeGUI();
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    repaint();
  }

  private void initializeGUI() {
    panel = new JPanel() {
      public void paintComponent(Graphics g) {
        super.paintComponent(g);
      }
    };

    this.setSize(new Dimension(700, 540));
    panel.setLayout(null);
    panel.setPreferredSize(new Dimension(700, 540));

    mazePic = new FrameImage(500, 500);
    pic = new JLabel(new ImageIcon(mazePic));
    panel.add(pic);
    pic.setBounds(20, 20, 500, 500);

    widthSlider = new JSlider(JSlider.HORIZONTAL, 5, 8, 8);
    widthSlider.addChangeListener(this);
    panel.add(widthSlider);
    widthSlider.setBounds(540, 40, 120, 20);

    widthLabel = new JLabel("Width: 8", JLabel.CENTER);
    panel.add(widthLabel);
    widthLabel.setBounds(540, 20, 120, 20);

    heightSlider = new JSlider(JSlider.HORIZONTAL, 5, 8, 8);
    heightSlider.addChangeListener(this);
    panel.add(heightSlider);
    heightSlider.setBounds(540, 80, 120, 20);

    heightLabel = new JLabel("Height: 8", JLabel.CENTER);
    panel.add(heightLabel);
    heightLabel.setBounds(540, 60, 120, 20);

    startButton = new JButton("Generate");
    startButton.addActionListener(this);
    panel.add(startButton);
    startButton.setBounds(540, 100, 120, 30);

    saveButton = new JButton("Save");
    saveButton.addActionListener(this);
    panel.add(saveButton);
    saveButton.setBounds(540, 140, 120, 30);
    saveButton.setEnabled(false);

    pack();
    getContentPane().add(panel);
    getRootPane().setDefaultButton(startButton);
    panel.setVisible(true);
  }

  public void stateChanged(ChangeEvent e) {
    if (e.getSource() == widthSlider) {
      widthLabel.setText("Width: " + widthSlider.getValue());
      repaint();
    } else if (e.getSource() == heightSlider) {
      heightLabel.setText("Height: " + heightSlider.getValue());
      repaint();
    }
  }

  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == startButton) {
      RecursiveGen r = new RecursiveGen();
      boolean[][][] maze = r.generate(widthSlider.getValue(), heightSlider.getValue());
      while (!r.validateMaze(maze)) {
        maze = r.generate(widthSlider.getValue(), heightSlider.getValue());
      }
      float edgeSize = .1f;
      float cellSizeX = (8f-edgeSize)/widthSlider.getValue() - edgeSize;
      float cellSizeY = (8f-edgeSize)/heightSlider.getValue() - edgeSize;
      MazeMesh mazemesh = new MazeMesh(maze, cellSizeX, cellSizeY, edgeSize);
      int s = 500;
      int t = 2;
      int wd = maze.length;
      int ht = maze[0].length;
      mazePic = new FrameImage((int)((s-(wd+1)*t)/wd)*wd+(wd+1)*t, (int)((s-(ht+1)*t)/ht)*ht+(ht+1)*t, s, t, maze);
      try {
        stl = mazemesh.getSTL();
      } catch (Exception ex) {
      } finally {
        saveButton.setEnabled(true);
        repaint();
      }
    } else if (e.getSource() == saveButton) {
      int returnVal = fc.showSaveDialog(this);
      if (returnVal == JFileChooser.APPROVE_OPTION) {
        currentFile = fc.getSelectedFile();

        //String filePath = currentFile.getPath().substring(0, currentFile.getPath().lastIndexOf("."));
        //String fileType = currentFile.getPath().substring(currentFile.getPath().lastIndexOf("."));
        String filePath = currentFile.getPath();
        if (filePath.lastIndexOf(".") != -1) {
          filePath = currentFile.getPath().substring(0, filePath.lastIndexOf("."));
        }
        filePath = filePath + ".stl";
        String fileName = currentFile.getName();

        BufferedWriter output = null;
        try {
          File f = new File(filePath);
          output = new BufferedWriter(new FileWriter(f));
          output.write(stl);
        } catch (IOException i) {
        } finally {
          if (output != null) {
            try {
              //repaint("STL file saved as " + fileName + " to " + filePath.substring(0, filePath.lastIndexOf("\\")));
              output.close();
            } catch(IOException i) {
            }
          }
        }
      }
    }
  }

  public void repaint() {
    if (pic != null) {
      panel.remove(pic);
      pic = new JLabel(new ImageIcon(mazePic));
      panel.add(pic);
      pic.setBounds(20, 20, 500, 500);
    }
    pack();
    panel.repaint();
  }

  public void repaint(String str) {
    log(str);
    pack();
    panel.repaint();
  }

  void log(String str) {
    logLabel.setText(str);
  }

  public void init() {

    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        setVisible(true);
      }
    });
  }

}