import uk.ac.ed.ph.signal.*;
import java.io.*;

/**         Simple test program to input an image using the
 *          general readImage method, extract a region of have
 *          size and display both in two display panels.
 */

public class ImageExtract {
    public static void main(String args[]) {
	//    Check we have a file name

        if (args.length == 0) {
            System.err.println("Usage: java ImageExtarct filename");
            System.exit(1);
        }

	RealImage im = RealImage.readImage(args[0]);
	System.out.println("Read image is " + im);

	//            set extarction parameters
	int w = im.getWidth()/2;             // Half width
	int h = im.getHeight()/2;            // Half height

	int left = w/2 + 10;                 // Left
	int top = h/2;                       // Top 

	//             do the extarction
	RealImage part = im.extract(left,top,w,h);
	System.out.println("Extarcted image is " + part);

	//             Dsiplay the two images.
	ImageFrame displayFull = new ImageFrame(im.getTitle());
	displayFull.addImage(im);

	ImageFrame displayPart = new ImageFrame(part.getTitle());
	displayPart.addImage(part);
    }
}