/*
 * Created on Apr 21, 2003
 *
 * To change this generated comment go to 
 * Window>Preferences>Java>Code Generation>Code Template
 */
package jdraw.figures;

import java.awt.*;
import java.awt.geom.*;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.List;
import java.util.ArrayList;

import jdraw.framework.*;

	/**
	 * Line implements straight lines
	 *
	 * @author  Christoph Denzler
	 * @version 1.0  21.4.03
	 */
public class Line extends AbstractFigure {
	
	private transient Line2D line;
	
	/**
	 * Create a new Line from begin to end.
	 * @param begin
	 * @param end
	 */
	public Line(Point begin, Point end) {
		line = new Line2D.Float(begin, end);
	}
	
	/**
	 * Create a new Line of length 0 starting
	 * at Point begin.
	 * @param begin
	 */
	public Line(Point begin) {
		line = new Line2D.Float(begin, begin);
	}

	/**
	 * Sets the bounding box. Note that the diagonal of the
	 * bounding box is the line defined by the two arguments
	 * @see jdraw.framework.Figure#setBounds(Point, Point)
	 */
	public void setBounds(Point origin, Point corner) {
		line.setLine(origin, corner);
		notifyListeners(new FigureEvent(this));
	}

	/**
	 * Draws the line
	 * @see jdraw.framework.Figure#draw(Graphics)
	 */
	public void draw(Graphics g) {
		Color tmp = g.getColor();
		g.setColor(getColor());
		g.drawLine((int)line.getX1(), (int)line.getY1(),
							 (int)line.getX2(), (int)line.getY2());
		g.setColor(tmp);
	}

	/**
	 * Tests whether the mouse coordinates are on the Line
	 * 
	 * @param x x-coordinate of mouse position
	 * @param y y-coordinate of mouse position
	 * @return <tt>true</tt>, if coordinates are contained in the figure, 
	 *         <tt>false</tt> otherwise
	 */
	public boolean contains(int x, int y) {
		return line.ptLineDistSq(x, y) <= gravity;
	}

	/* (non-Javadoc)
	 * @see jdraw.framework.Figure#move(int, int)
	 */
	public void move(int dx, int dy) {
		line.setLine(line.getX1()+dx, line.getY1()+dy, line.getX2()+dx, line.getY2()+dy);
		notifyListeners(new FigureEvent(this));
	}

	/* (non-Javadoc)
	 * @see jdraw.framework.Figure#getBounds()
	 */
	public java.awt.Rectangle getBounds() {
		return line.getBounds();
	}
	
	public Point getBegin() {
		return new Point((int)line.getX1(), (int)line.getY1());
	}

	public Point getEnd() {
		return new Point((int)line.getX2(), (int)line.getY2());
	}
	
	public int getLength () {
		return (int)line.getP1().distance(line.getP2());
	}
	/**
	 * Returns a list of 8 handles for this Rectangle
	 * @see jdraw.framework.Figure#getHandles()
	 */	
	public List getHandles() {
		List handles = new ArrayList(2);
		handles.add(new LineBeginHandle(this));
		handles.add(new LineEndHandle(this));
		return handles;
	}

	/**
	 * Copies the internals of Rectangle.
	 * 
	 * @see java.lang.Object#clone()
	 */
	public Object clone() {
		Line copy = (Line)super.clone();
		if (copy != null) {
			copy.line = (Line2D)line.clone();
		}
		return copy;
	}
	
	private void writeObject(ObjectOutputStream oos) throws IOException {
		oos.defaultWriteObject();
		oos.writeFloat((float)line.getX1());
		oos.writeFloat((float)line.getY1());
		oos.writeFloat((float)line.getX2());
		oos.writeFloat((float)line.getY2());
	}
	
	private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
		ois.defaultReadObject();
		float x1 = ois.readFloat();
		float y1 = ois.readFloat();
		float x2 = ois.readFloat();
		float y2 = ois.readFloat();
		line = new Line2D.Float(x1, y1, x2, y2);
	}

}