package ac.essex.ooechs.imaging.commons.util; 
 
import java.awt.event.MouseEvent; 
import java.awt.*; 
 
/** 
 * <p/> 
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU General Public License 
 * as published by the Free Software Foundation; either version 2 
 * of the License, or (at your option) any later version, 
 * provided that any use properly credits the author. 
 * This program is distributed in the hope that it will be useful, 
 * but WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
 * GNU General Public License for more details at http://www.gnu.org 
 * </p> 
 * 
 * @author Olly Oechsle, University of Essex, Date: 17-Oct-2006 
 * @version 1.0 
 */ 
public class Region { 
 
    public int x1; 
    public int y1; 
    public int x2; 
    public int y2; 
 
    public Region(int x1, int y1) { 
        this.x1 = x1; 
        this.y1 = y1; 
        this.x2 = x1; 
        this.y2 = y1; 
    } 
 
    public Region(int x1, int y1, int width, int height) { 
        this.x1 = x1; 
        this.y1 = y1; 
        this.x2 = x1 + width; 
        this.y2 = y1 + height; 
    } 
 
    public Region(Region r) { 
        this.x1 = r.x1; 
        this.y1 = r.y1; 
        this.x2 = r.x2; 
        this.y2 = r.y2; 
    } 
 
    public boolean contains(MouseEvent e) { 
        return contains(e.getX(), e.getY()); 
    } 
 
    /** 
     * Determines if a point (x, y) is contains this rectangle. 
     */ 
    public boolean contains(int x, int y) { 
        return (x >= getStartX() && x <= (getStartX() + getWidth()) && y >= getStartY() && y <= (getStartY() + getHeight())); 
    } 
 
    /** 
     * Determines if another rectangle is contained fully inside this one 
     */ 
    public boolean contains(Region other) { 
 
        int x1 = other.getStartX(); 
        int y1 = other.getStartY(); 
 
        int x2 = x1 + other.getWidth(); 
        int y2 = y1 + other.getWidth(); 
 
        return contains(x1, y1) && contains(x2, y2); 
 
    } 
 
    /** 
     * Determines the percentage of another rectangle within this rectangle 
     */ 
    public double overlap(Region other) { 
 
        int pixelCount = 0; 
 
        for (int y = other.getStartY(); y < (other.getStartY() + other.getHeight()); y++) { 
            for (int x = other.getStartX(); x < (other.getStartX() + other.getWidth()); x++) { 
                if (contains(x, y)) pixelCount++; 
            } 
        } 
 
        return pixelCount / (double) other.getArea(); 
 
    } 
 
    public int getArea() { 
        return getWidth() * getHeight(); 
    } 
 
    public int getWidth() { 
        return Math.abs(x2 - x1); 
    } 
 
    public int getHeight() { 
        return Math.abs(y2 - y1); 
    } 
 
    public int getStartX() { 
        return Math.min(x1, x2); 
    } 
 
    public int getStartY() { 
        return Math.min(y1, y2); 
    } 
 
    public void move(Region r, int dX, int dY) { 
        this.x1 = r.x1 + dX; 
        this.x2 = r.x2 + dX; 
        this.y1 = r.y1 + dY; 
        this.y2 = r.y2 + dY; 
    } 
 
    public void move(int dX, int dY) { 
        this.x1 += dX; 
        this.x2 += dX; 
        this.y1 += dY; 
        this.y2 += dY; 
    } 
 
    public void draw(Graphics g) { 
        g.drawRect(getStartX(), getStartY(), getWidth(), getHeight()); 
    } 
 
    public void fill(Graphics g) { 
        g.fillRect(getStartX(), getStartY(), getWidth(), getHeight()); 
    } 
 
    public void setWidth(int width) { 
        if (x2 > x1) { 
            x2 = x1 + width; 
        } else { 
            x2 = x1 - width; 
        } 
    } 
 
    public void setHeight(int height) { 
        if (y2 > y1) { 
            y2 = y1 + height; 
        } else { 
            y2 = y1 - height; 
        } 
    } 
 
    protected int hits; 
 
    public int getHits() { 
        return hits; 
    } 
 
    public void incrementHits() { 
        hits++; 
    } 
 
    public void setHits(int hits) { 
        this.hits = hits; 
    } 
 
}