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

public class DisplayMandelbrot
{
	public static final int MAX_X = 1000, MAX_Y =1000, COLOR_INC = 80;
	
	public static int[][] buffer = null;
	public static float iterations = 0;
	
	public static void main(String[] args)
	{
		// Read the mandelbrot display data from a file
		JFileChooser fc = new JFileChooser
						(new File(System.getProperty("user.dir")));
						
		int result = fc.showOpenDialog(null);
		if (result != JFileChooser.APPROVE_OPTION) return;
		
		File file = fc.getSelectedFile();
		
		try
		{
			DataInputStream in = new DataInputStream
					(new FileInputStream(file));
		
			int rows = convertBigEndian(in.readInt());
			int columns = convertBigEndian(in.readInt());
			iterations = convertBigEndian(in.readInt());
			
			buffer = new int[rows][columns];
			for (int row=0; row<rows; row++)
			{
				for (int col=0; col<columns; col++)
				{
					buffer[row][col] = convertBigEndian(in.readInt());
				}
			}
			
		}
		catch (Exception e)
		{
			JOptionPane.showMessageDialog(null, "Couldn't read file");
		}
		
		JFrame frame = new JFrame("Color tester");
		
		JPanel panel = new JPanel()
		{
			public void paintComponent(Graphics g)
			{
				int rgb = 0;
				Color color = null;
				
				for (int row=0; row<buffer.length-1; row++)
				{
					for (int col=0; col<buffer[0].length; col++)
					{
						rgb = buffer[row][col];
						
						color = getColor(rgb);
						g.setColor(color);
						g.fillRect(col,row,1,1);
					}
				}
				
			}
			
		};
		
		panel.setSize(MAX_X, MAX_Y);

		frame.getContentPane().add(panel);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(buffer[0].length, buffer.length);
		frame.setVisible(true);
	}
	
	public static Color getColor(int c) 
	{
		float brightness = ((c*5>iterations)? iterations : c*5) /iterations;
		float hue = c / iterations;
		float saturation = 1.0F;
		return Color.getHSBColor(hue, saturation, brightness);
   }
	
	public static int convertBigEndian(int value)
	{
		int result = 0;
		for (int i=0; i<32; i+=8)
		{
			result += ((value>>i) & 255) << (24 - i);
		}
		return result;
	}

}