/*	SimpleLineSketch.java
*	@author: Charles Bell
*	@version: June 18, 2002
*/
 
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
 
public class SimpleLineSketch extends JApplet{
	
	private boolean inAnApplet = true;
	private boolean debug = false;
		
	public static void main(String[] args){
		SimpleLineSketch sketch = new SimpleLineSketch();
		sketch.inAnApplet =  false;
		sketch.init();
	}
	
	public void init(){
		
		getContentPane().add(new SketchPad());
		
		if (!inAnApplet){
			JFrame frame = new JFrame("SimpleLineSketch");
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			frame.getContentPane().add(this);
			frame.pack();
			frame.show();
		}
	}
	
	class SketchPad extends Canvas implements MouseListener, MouseMotionListener{
 
		private boolean isOnPad = false;
		private Point startPoint = new Point(0,0);
		private Point endPoint = new Point(0,0);
		private Vector strokes = new Vector();
 
		public SketchPad(){
			setSize(Toolkit.getDefaultToolkit().getScreenSize());
			addMouseListener(this);
			addMouseMotionListener(this);
		}
 
		
		public void paint(Graphics g){
			ListIterator iterator = strokes.listIterator();
			while (iterator.hasNext()){
				BrushStroke nextBrushStroke = (BrushStroke)iterator.next();
				g.drawLine(nextBrushStroke.start.x, nextBrushStroke.start.y, 
				  nextBrushStroke.end.x, nextBrushStroke.end.y);
			}
			g.drawLine(startPoint.x, startPoint.y, 
				  endPoint.x, endPoint.y);
 
		}
		
		/**	Invoked when the mouse button has been clicked (pressed and released) on the Sketch Pad.
		*/
		public void mouseClicked(MouseEvent me){
			if (debug) System.out.println("mouseClicked");
			
		}
 
		/** Invoked when the mouse enters the Sketch Pad. 
		*/
		public void mouseEntered(MouseEvent me){
			if (debug) System.out.println("mouseEntered");
			isOnPad = true;
			
		}
 
		/**	Invoked when the mouse exits a componentthe Sketch Pad.
		*/
		public void mouseExited(MouseEvent me){
			if (debug) System.out.println("mouseExited");
			isOnPad = false;
			
		}
 
 
		/** Invoked when a mouse button has been pressed on the Sketch Pad.
		*/
		public void mousePressed(MouseEvent me){
			if (debug) System.out.println("mousePressed at " + me.getPoint().toString());
			startPoint = me.getPoint();
		}
 
		/**	Invoked when a mouse button has been released on the Sketch Pad.
		*/
		public void mouseReleased(MouseEvent me){
			if (debug) System.out.println("mouseReleased at " + me.getPoint().toString());
			endPoint = me.getPoint();
			strokes.add(new BrushStroke(startPoint, endPoint));
			update(getGraphics());
			
			
		}
 
		/**	Invoked when a mouse button is pressed on on the Sketch Pad and then dragged
		*/
		public void mouseDragged(MouseEvent me){
			if (debug) System.out.println("mouseDragged");
			endPoint = me.getPoint();
			update(getGraphics());
			
		}
 
		/** 	Invoked when the mouse button has been moved onthe Sketch Pad (with no buttons down).
		*/
		public void mouseMoved(MouseEvent me){
			if (debug) System.out.println("mouseMoved");			
		}
	}
	
	class BrushStroke{
		
		Point start;
		Point end;
		
		public BrushStroke(Point start, Point end){
			this.start = start;
			this.end = end;
		}
 
	}
}