package ac.essex.ooechs.imaging.commons.subpixel; 
 
import ac.essex.ooechs.imaging.commons.Pixel; 
import ac.essex.ooechs.imaging.commons.PixelLoader; 
 
import java.awt.image.BufferedImage; 
import java.awt.*; 
 
/** 
 * Exracts linear parts out from an image. Simply specify the start point and 
 * end point of the line, and the width. Uses subpixel sampling so the new image 
 * is nice and clear. 
 * 
 * @author Olly Oechsle, University of Essex, Date: 14-Mar-2008 
 * @version 1.0 
 */ 
public class LineExtractor { 
 
    public static PixelLoader extract(PixelLoader image, int width, Pixel start, Pixel end) { 
        return extract(image, width, start.x, start.y, end.x, end.y); 
    } 
 
    public static PixelLoader extract(PixelLoader image, int width, int startX, int startY, int endX, int endY) { 
 
        double dx = startX - endX; 
        double dy = startY - endY; 
 
        // find the mid point 
        double mx = startX - (dx / 2); 
        double my = startY - (dy / 2); 
 
        // want to see 10 pixels on either side of the line 
        int height = (int) Math.sqrt((dx * dx) + (dy * dy)); 
        double angle = -Math.atan(dx/dy); 
 
        return SubPixel.extractRectangle(image, mx, my, width, height, angle); 
 
    }      
 
}