import java.awt.*;
import java.applet.*;
import java.awt.image.*; // To get the PixelGrabber

/**
 * This class reads PARAM tags from its HTML host page and sets
 * the color and label properties of the applet. Program execution
 * begins with the init() method. 
 */
public class imagepr2 extends Applet
{
	/**
	 * The entry point for the applet. 
	 */
	
	
	Image m_Original, m_Processed, m_Processed2, m_Processed3; // The four image objects to use (last three will be the modified ones)
	
		
	public void init()
	{
		//initForm();

		//usePageParams();

		// TODO: Add any constructor code after initForm call.
		MediaTracker Tracker = new MediaTracker(this);
		m_Original = getImage(getDocumentBase(), "fotoapplet4.jpg"); // Load the original image
		Tracker.addImage(m_Original,0);
		try
		{
			Tracker.waitForID(0);
			m_Processed = processImage();
			m_Processed2 = processImage2();
			m_Processed3 = processImage3();
		}
		catch(InterruptedException e)
		{
		}
		
	}

	private	final String labelParam = "label";
	private	final String backgroundParam = "background";
	private	final String foregroundParam = "foreground";

	/**
	 * Reads parameters from the applet's HTML host and sets applet
	 * properties.
	 */
	private void usePageParams()
	{
		final String defaultLabel = "Default label";
		final String defaultBackground = "C0C0C0";
		final String defaultForeground = "000000";
		String labelValue;
		String backgroundValue;
		String foregroundValue;

		/** 
		 * Read the <PARAM NAME="label" VALUE="some string">,
		 * <PARAM NAME="background" VALUE="rrggbb">,
		 * and <PARAM NAME="foreground" VALUE="rrggbb"> tags from
		 * the applet's HTML host.
		 */
		labelValue = getParameter(labelParam);
		backgroundValue = getParameter(backgroundParam);
		foregroundValue = getParameter(foregroundParam);

		if ((labelValue == null) || (backgroundValue == null) ||
			(foregroundValue == null))
		{
			/**
			 * There was something wrong with the HTML host tags.
			 * Generate default values.
			 */
			labelValue = defaultLabel;
			backgroundValue = defaultBackground;
			foregroundValue = defaultForeground;
		}

		/**
		 * Set the applet's string label, background color, and
		 * foreground colors.
		 */
		label1.setText(labelValue);
		label1.setBackground(stringToColor(backgroundValue));
		label1.setForeground(stringToColor(foregroundValue));
		this.setBackground(stringToColor(backgroundValue));
		this.setForeground(stringToColor(foregroundValue));
	}

	/**
	 * Converts a string formatted as "rrggbb" to an awt.Color object
	 */
	private Color stringToColor(String paramValue)
	{
		int red;
		int green;
		int blue;

		red = (Integer.decode("0x" + paramValue.substring(0,2))).intValue();
		green = (Integer.decode("0x" + paramValue.substring(2,4))).intValue();
		blue = (Integer.decode("0x" + paramValue.substring(4,6))).intValue();

		return new Color(red,green,blue);
	}

	/**
	 * External interface used by design tools to show properties of an applet.
	 */
	public String[][] getParameterInfo()
	{
		String[][] info =
		{
			{ labelParam, "String", "Label string to be displayed" },
			{ backgroundParam, "String", "Background color, format \"rrggbb\"" },
			{ foregroundParam, "String", "Foreground color, format \"rrggbb\"" },
		};
		return info;
	}

	Label label1 = new Label();

	/**
	 * Intializes values for the applet and its components
	 */
	void initForm()
	{
		this.setBackground(Color.lightGray);
		this.setForeground(Color.black);
		label1.setText("label1");
		this.setLayout(new BorderLayout());
		this.add("North",label1);
	}
	
	public void paint(Graphics g)
	{
		
		// Draws original image
		g.drawImage(m_Original, 5, 10, this);
		
		// Draws image on shades of gray
		g.drawImage(m_Processed, 5 + m_Original.getWidth(this)+ 2, 10, this);
		
		// Draws brightened image
		g.drawImage(m_Processed2, 5, 305, this);
		
		// Draws colored image
		g.drawImage(m_Processed3, 5 + m_Original.getWidth(this)+ 2, 305, this);
	}
	
	public Image processImage()
	{
		Image img = null;
		
		int nWidth = m_Original.getWidth(this);
		int nHeight = m_Original.getHeight(this);
		int nNumPixels = nWidth * nHeight;
		
		int nRawPixels[] = new int[nNumPixels];
		
		PixelGrabber Grabber = new PixelGrabber(m_Original, 0,0,nWidth,nHeight,nRawPixels,0,nWidth);
		
		try
		{
			Grabber.grabPixels();
			ColorModel cm = ColorModel.getRGBdefault(); // Get the color model to create an image from pixel data
		
			MemoryImageSource ImageSource= new MemoryImageSource(nWidth, nHeight, cm, nRawPixels, 0, nWidth);
			
			for(int nPixel=0; nPixel<nNumPixels; nPixel++)
			{
				int r = cm.getRed(nRawPixels[nPixel]);
				int g = cm.getGreen(nRawPixels[nPixel]);
				int b = cm.getBlue(nRawPixels[nPixel]);
				
				// This line caculates the Gray scale value for the current pixel
				int nNewGray = ((r*30) + (g*69) + (b*11)) / 100;
					r = nNewGray;
					g = nNewGray;
					b = nNewGray;
					
					nRawPixels[nPixel] = 0xff000000|(r<<16)|(g<<8)|b;  // Store color components in the pixel data array
			}
			
			img = createImage(ImageSource);
			
			MediaTracker Tracker = new MediaTracker(this);
			Tracker.addImage(img, 1);
			Tracker.waitForID(1);		
		}
		catch(InterruptedException e)
		{
		}
		return(img);
	}
	
	public Image processImage2()
	{
		Image img = null;
		
		int nWidth = m_Original.getWidth(this);
		int nHeight = m_Original.getHeight(this);
		int nNumPixels = nWidth * nHeight;
		
		int nRawPixels[] = new int[nNumPixels];
		
		PixelGrabber Grabber = new PixelGrabber(m_Original, 0,0,nWidth,nHeight,nRawPixels,0,nWidth);
		
		try
		{
			Grabber.grabPixels();
			ColorModel cm = ColorModel.getRGBdefault(); // Get the color model to create an image from pixel data
		
			MemoryImageSource ImageSource= new MemoryImageSource(nWidth, nHeight, cm, nRawPixels, 0, nWidth);
			
			for(int nPixel=0; nPixel<nNumPixels; nPixel++)
			{
				int r = cm.getRed(nRawPixels[nPixel]);
				int g = cm.getGreen(nRawPixels[nPixel]);
				int b = cm.getBlue(nRawPixels[nPixel]);
				
				// These lines caculate the new values to brighten the scale
				r = (r*150)/100;
				g = (g*150)/100;
				b = (b*150)/100;
				
				// If the color component becomes saturated, set it to the maximum allowed
				if(r>255)
					r = 255;
				if(g>255)
					g = 255;
				if(b>255)
					b = 255;
				
				nRawPixels[nPixel] = 0xff000000|(r<<16)|(g<<8)|b;  // Store color components in the pixel data array
			}
			
			img = createImage(ImageSource);
			
			MediaTracker Tracker = new MediaTracker(this);
			Tracker.addImage(img, 1);
			Tracker.waitForID(1);		
		}
		catch(InterruptedException e)
		{
		}
		return(img);
	}

	public Image processImage3()
	{
		Image img = null;
		
		int nWidth = m_Original.getWidth(this);
		int nHeight = m_Original.getHeight(this);
		int nNumPixels = nWidth * nHeight;
		
		int nRawPixels[] = new int[nNumPixels];
		
		PixelGrabber Grabber = new PixelGrabber(m_Original, 0,0,nWidth,nHeight,nRawPixels,0,nWidth);
		
		try
		{
			Grabber.grabPixels();
			ColorModel cm = ColorModel.getRGBdefault(); // Get the color model to create an image from pixel data
		
			MemoryImageSource ImageSource= new MemoryImageSource(nWidth, nHeight, cm, nRawPixels, 0, nWidth);
			
			for(int nPixel=0; nPixel<nNumPixels; nPixel++)
			{
				int r = cm.getRed(nRawPixels[nPixel]);
				int g = cm.getGreen(nRawPixels[nPixel]);
				int b = cm.getBlue(nRawPixels[nPixel]);
				
				
				// This line calculates the saturation level
				int nSaturationLevel = (r*30 + g*59 + b*11) / 100;
				
				// These lines caculate the new values to color the original image (in green)
				r = 0;
				g = nSaturationLevel;
				b = 0;
				
				nRawPixels[nPixel] = 0xff000000|(r<<16)|(g<<8)|b;  // Store color components in the pixel data array
			}
			
			img = createImage(ImageSource);
			
			MediaTracker Tracker = new MediaTracker(this);
			Tracker.addImage(img, 1);
			Tracker.waitForID(1);		
		}
		catch(InterruptedException e)
		{
		}
		return(img);
	}

	
}