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

public class blabla extends JFrame
{

// JPanel for the shape and color controls
	private JPanel controlsJPanel;
	// JComboBox to allow selection of a shape
	private JComboBox shapeJComboBox;
	// JButton to select the color
	private JButton colorJButton;
	// PaintJPanel for drawing shapes
	private PaintJPanel painterPaintJPanel;
	
	// array of shape types
	private	String[] shapeTypes = {"Line","Rectangle","Oval"};
	
	public blabla()
	{
		createUserInterface();
	}

// create and position GUI components; register event handlers
	private void createUserInterface()
	{
		// get content pane for attaching GUI components
		Container contentPane = getContentPane();
		// enable explicit positioning of GUI components
		contentPane.setLayout(null);

// set up controlsJPanel
		controlsJPanel = new JPanel();
		controlsJPanel.setBounds(0,0,400,40);
		controlsJPanel.setLayout(null);
		contentPane.add( controlsJPanel );
		
		// set up painterPaintJPanel
		painterPaintJPanel = new PaintJPanel();
		painterPaintJPanel.setBounds(0,40,400,340);
		painterPaintJPanel.setBackground(Color.WHITE);
		contentPane.add( painterPaintJPanel ); 
		
		// set up shapeJComboBox
		shapeJComboBox = new JComboBox( shapeTypes );
		shapeJComboBox.setBounds(90,2,100,24);
		controlsJPanel.add( shapeJComboBox );
		shapeJComboBox.addActionListener(

new ActionListener()// anonymous inner class
		{
			// event method called when shapeJComboBox is selected

public void actionPerformed( ActionEvent event )
			{
				shapeJComboBoxActionPerformed( event );
			}
		} // end anonymous inner class

);	// end call to addActionListener

// set up colorJButton
		colorJButton = new JButton();
		colorJButton.setBounds(210,2,80,24);
		colorJButton.setText("Color");
		controlsJPanel.add( colorJButton );
		
		colorJButton.addActionListener(
		new ActionListener() // anonymous inner class
		{
		// event handler called when colorJButton is pressed
			public void actionPerformed( ActionEvent event )
			{
				colorJButtonActionPerformed( event );
			}
		} // end anonymous inner class
		); // end call to addActionListener

// set properties of application’s window
	setTitle("Drawing Shapes");
	// set title bar string
	setSize(408,407);
	// set window size
	setVisible(true);
	// display window
}	// end method createUserInterface

// select a new color for the shape
private void colorJButtonActionPerformed( ActionEvent event )
{
	Color selection = JColorChooser.showDialog(null,
	"Select a Color",Color.BLACK);

if ( selection != null)
	{
		colorJButton.setBackground( selection );
		painterPaintJPanel.setCurrentColor( selection );
	}
} // end method colorJButtonActionPerformed

// set the selected shape in the painting panel
private void shapeJComboBoxActionPerformed( ActionEvent event )
{
	painterPaintJPanel.setCurrentShapeType(
	( String )shapeJComboBox.getSelectedItem() );

} // end method shapeJComboBoxActionPerformed

// main method
	public static void main( String args[] )
	{
		blabla application = new blabla();
		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}// end method main
}

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
}	
	
	
abstract class MyShape extends Object
{
	private int x1;
	private int	y1;
	private int x2;
	private int y2;
	private Color color;

// constructor
	public MyShape(int firstX,int firstY,int secondX,int secondY,Color shapeColor )
	{
		setX1( firstX );
		setY1( firstY );
		setX2( secondX );
		setY2( secondY );
		setColor( shapeColor );
	}
	// end constructor

// set x1 value
	public void setX1(int x )
	{
		x1 = x;
	}
	// end method setX1

// get x1 value
	public int getX1()
	{
		return x1;
	}
	// end method getX1

// set Y1 value
	public void setY1(int y )
	{
		y1 = y;
	}
	// end method setY1

// get Y1 value
	public int getY1()
	{
		return y1;
	}
	// end method getY1

// set x2 value
	public void setX2(int x )
	{
		x2 = x;
	}
	// end method setX2

// get x2 value
	public int getX2()
	{
		return x2;
	}
	// end method getX2

// set y2 value
	public void setY2(int y )
	{
		y2 = y;
	}
	// end method setY2

// get y2 value
	public int getY2()
	{
		return y2;
	}
	// end method getY2

// set color value
	public void setColor( Color c )
	{
		color = c;
	}
	// end method setColor

// get color value
	public Color getColor()
	{
		return color;
	}
	// end method getColor
	
	// abstract draw method
	public abstract void draw( Graphics g );

}// end class MyShape

class MyLine extends MyShape
{
	// constructor
	public MyLine(int firstX,int firstY,int secondX,int secondY,Color shapeColor )
	{
		super( firstX, firstY, secondX, secondY, shapeColor );
	}
	// end constructor

// draw a line
	public void draw( Graphics g )
	{
		g.setColor( getColor() );
		g.drawLine( getX1(), getY1(), getX2(), getY2() );
	}
	// end method draw
	
}// end class MyLine

class MyRectangle extends MyShape
{
	// constructor
	public MyRectangle(int firstX,int firstY,int secondX,int secondY, Color shapeColor )
	{
		super( firstX, firstY, secondX, secondY, shapeColor );
	}
	// end constructor

// draw a rectangle
	public void draw( Graphics g )
	{
		int upperLeftX = Math.min( getX1(), getX2() );
		int upperLeftY = Math.min( getY1(), getY2() );
		int width = Math.abs( getX1() - getX2() );
		int height = Math.abs( getY1() - getY2() );
		g.setColor( getColor() );
		g.fillRect( upperLeftX, upperLeftY, width, height );		
	}
	// end method draw
} // end class MyRectangle

class MyOval extends MyShape 
{
	// constructor
	public MyOval(int firstX,int firstY,int secondX,int secondY, Color shapeColor )
    {
		super( firstX, firstY, secondX, secondY, shapeColor );
	}
	// end constructor
	
	// draw an oval
	public void draw( Graphics g )
	{
		int upperLeftX = Math.min( getX1(), getX2() );
		int upperLeftY = Math.min( getY1(), getY2() );
		int width = Math.abs( getX1() - getX2() );
		int height = Math.abs( getY1() - getY2() );
		g.setColor( getColor() );
		g.fillOval( upperLeftX, upperLeftY, width, height );
	}
	// end method draw
}// end class MyOval