//PolygonsTest.java 

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

public class PolygonsTest extends JApplet 
    implements ActionListener,  ItemListener {
    //ItemListener for JComboBox events

    Polygon mypoly;    //polygon of vertices/points
    JButton drawButton;
    JComboBox colorsComboBox;   //drop-down select box of items
    boolean drawButtonClicked, mouseClicked;
    int x, y;  //mouse clicks
    //initailize elements of an array of String
    String [] colors = {"black", "white", "red", "green", "blue", 
			"cyan", "magenta", "yellow", "gray",
			"pink", "orange", "darkGray"}; 
    String drawingColorString;

    public void init() {

	mypoly = new Polygon();     //empty polygon object
	drawButtonClicked = false;
	mouseClicked = false;
	drawingColorString = colors[0];  //black

	Container container = getContentPane();  
	container.setLayout( new FlowLayout() ); 

	drawButton = new JButton( "Draw it now" );
	container.add( drawButton );
	drawButton.addActionListener( this );
	
	//item names are in array of String.
	//combobox itself is like array: indexed
	colorsComboBox = new JComboBox(colors);
	colorsComboBox.setMaximumRowCount(4); //4 items shown at most
	container.add( colorsComboBox );
	//register that this applet will handle combobox events
	colorsComboBox.addItemListener( this );


	addMouseListener(
	   new MouseAdapter() {
	       public void mouseClicked( MouseEvent event) {
		   x = event.getX();
		   y = event.getY();
		   showStatus("("+x+","+y+")");
		   //append this point to the polygon object
		   mypoly.addPoint( x, y);
		   mouseClicked = true;
		   repaint();    //display this point
	       }
	   }
        );

    }


    public void actionPerformed( ActionEvent event ) {
	if ( event.getSource() == drawButton ) {
	    drawButtonClicked = true;
	    repaint();    
	}
    }

    // event handler for JComboBox events
    public void itemStateChanged( ItemEvent event ) {    
	if ( event.getSource() == colorsComboBox ) {
	    //an item was selected
	    if ( event.getStateChange() == ItemEvent.SELECTED ) {
		//index of selected item
		int i = colorsComboBox.getSelectedIndex();
		drawingColorString = colors[i];
	    }
	}
    }

    public void paint ( Graphics g ) {
	//super.paint( g );

	if (drawButtonClicked) {
	    /*
	    g.setColor(new Color((int)(Math.random()*256),
				 (int)(Math.random()*256),
				 (int)(Math.random()*256)));
	    */
	    g.setColor( makeColor( drawingColorString ) );
	    //display the polygon.
	    g.fillPolygon( mypoly );
	    drawButtonClicked = false;
	    mypoly = new Polygon();   //create new empty polygon
	}
	else if (mouseClicked) {
	    g.setColor(Color.BLACK);
	    g.drawLine(x,y,x,y);
	    mouseClicked = false;
	}
    }

    //is there an easier way to go from a string to a color???
    public Color makeColor( String s ) {
	Color colorObject;
	if (s.equals("black"))
	    colorObject = Color.BLACK;
        else if (s.equals("white"))
	    colorObject = Color.white;
        else if (s.equals("red"))
	    colorObject = Color.RED;
        else if (s.equals("blue"))
	    colorObject = Color.blue;
        else if (s.equals("green"))
	    colorObject = Color.green;
        else if (s.equals("yellow"))
	    colorObject = Color.yellow;
        else if (s.equals("magenta"))
	    colorObject = Color.magenta;
        else if (s.equals("cyan"))
	    colorObject = Color.cyan;
        else if (s.equals("pink"))
	    colorObject = Color.pink;
        else if (s.equals("orange"))
	    colorObject = Color.orange;
        else if (s.equals("darkGray"))
	    colorObject = Color.darkGray;
	else
	    colorObject = Color.black;

	return colorObject;
    }

}