import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.swing.*;


public class Img extends JFrame{
	private Image img = null;
	private int width, height;
	private int rgbarray[][];
	private int imgarray[];

	public void ShowImage() {
		JFrame frame = new JFrame("Podglad obrazka"); 
        JLabel label = new JLabel(new ImageIcon(img));                    
        frame.getContentPane().add(label, BorderLayout.CENTER);             
        frame.pack();                                                       
        frame.setVisible(true);       
	}

	public Img(String filename) {
		LoadImage(filename);
		AllocateArrays();
		FillRGBArray();
	}

	public Img(int imgwidth, int imgheight) {
		setWidth(imgwidth);
		setHeight(imgheight);
		AllocateArrays();
		FillRGBArray();
	}

	public Image getImage() {
		return img;
	}

	public int getWidth() {
		return width;
	}

	public int getHeight() {
		return height;
	}

	public void setHeight(int newHeight) {
		height = newHeight;
	}

	public void setWidth(int newWidth) {
		width = newWidth;
	}

	public void LoadImage(String filename) {
		ImageIcon icon = new ImageIcon(filename);
		img = icon.getImage();
		width = img.getWidth(null);
		height = img.getHeight(null);
	}

	public void AllocateArrays() {
        imgarray = new int [width * height];
		rgbarray = new int[width * height][3];
	}
		
	public void FillRGBArray() {
		if (img == null)
			Build();
        PixelGrabber pg = new PixelGrabber (img, 0, 0, width, height, imgarray, 0, width);

        try {
            pg.grabPixels();
        }
        catch (InterruptedException e) {
            System.err.println("interrupted waiting for pixels!");
        }

        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                Color c = GetPixelColor(x, y);

                rgbarray[y * width + x][0] = (int)c.getRed();
                rgbarray[y * width + x][1] = (int)c.getGreen();
                rgbarray[y * width + x][2] = (int)c.getBlue();
			}
		}
	}

	public void Build() {
		img = createImage (new MemoryImageSource(width, height, imgarray, 0, width));
	}

    public Color GetPixelColor (int x, int y) {
        int pixel = imgarray [y * width + x];

        int alpha = (pixel >> 24) & 0xff;
        int red   = (pixel >> 16) & 0xff;
        int green = (pixel >>  8) & 0xff;
        int blue  = (pixel      ) & 0xff;

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

	public void SetPixelColor(int x, int y, Color color) {
		imgarray[y * width + x] = ((int)color.getAlpha() << 24) | ((int)color.getRed() << 16) | ((int)color.getGreen() << 8) | (int)color.getBlue();

        rgbarray[y * width + x][0] = (int)color.getRed();
        rgbarray[y * width + x][1] = (int)color.getGreen();
        rgbarray[y * width + x][2] = (int)color.getBlue();
	} 
}