//  PaintJPanel.java

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;


public class PaintJPanel extends JPanel 
{
	// ArrayList to hold the shapes
	private ArrayList shapesArrayList = new ArrayList();
	
	// currently selected shape type
	private String currentType = "Line";
	// currently selected color
	private Color currentColor = new Color(204,204,204);

	// no-argument constructor
	public PaintJPanel()
	{
		addMouseListener(
		
		new MouseAdapter() // anonymous inner class
		{
		// event handler called when mouse button is pressed
			public void mousePressed( MouseEvent event )
			{
				paintJPanelMousePressed( event );
			}
		} // end anonymous inner class
		); // end call to addMouseListener


	addMouseMotionListener(
		new MouseMotionAdapter() // anonymous inner class
		{
		// event handler called when the mouse is dragged
		public void mouseDragged( MouseEvent event )
		{
			paintJPanelMouseDragged( event );
		}

		}// end anonymous inner class
	);// end call to addMouseMotionListener
	}// end constructor

	// change the current shape type
	public void setCurrentShapeType( String shape )
	{
		currentType = shape;
	}// end method setCurrentShapeType

	// change the current color
	public void setCurrentColor( Color shapeColor )
	{
		currentColor = shapeColor;
	}
	// end method setCurrentColor

	
	// create a new shape
	public void paintJPanelMousePressed( MouseEvent event )
	{
		// user selected line
		if( currentType.equals("Line") )
		{
			currentShape = new MyLine( event.getX(), event.getY(),event.getX(), event.getY(), currentColor );
		}
		// user selected rectangle
		else if( currentType.equals("Rectangle") )
		{
			currentShape = new MyRectangle( event.getX(), event.getY(),event.getX(), event.getY(), currentColor );
		}
		// user selected oval
		else if( currentType.equals("Oval") )
		{
			currentShape = new MyOval( event.getX(), event.getY(),event.getX(), event.getY(), currentColor );
		}
		shapesArrayList.add( currentShape );
	}
	// end method paintJPanelMousePressed
	

	// reset the second point for the shape
	public void paintJPanelMouseDragged( MouseEvent event )
	{
		currentShape.setX2( event.getX() );
		currentShape.setY2( event.getY() );
		repaint(); 
	}

	// paint all the shapes
	public void paintComponent( Graphics g )
	{
		super.paintComponent( g );
		MyShape nextShape;
		Iterator shapesIterator = shapesArrayList.iterator();
		
		// iterate through all the shapes
		while( shapesIterator.hasNext() )
		{
			// draw each shape
			nextShape = ( MyShape ) shapesIterator.next();
			nextShape.draw( g );
		} // end method paintComponent
	} // end class PaintJPanel