import uwcse.graphics.*;
import java.awt.Color;
import java.util.*;

// Display some graphics at the location of the mouse click
// (here a filled circle of radius 30. The color of the circle is random)

public class MouseHandler extends GWindowEventAdapter {

    // Graphics window
    private GWindow window;

	// Keep track of the circles in an ArrayList
	private ArrayList circles = new ArrayList();

	// Are we adding circles to the window?
	boolean isInAddMode = true;

    public MouseHandler()
    {
        // Create a graphics window
		this.window = new GWindow("Using the mouse",400,400);

        // Terminate the application when closing the window
		this.window.setExitOnClose();

        // Send all of the events to this MouseHandler
		this.window.addEventHandler(this);
    }

    // Method to manage the mouse clicks

    /**
     * Invoked when a mouse button has been pressed on the window.
     */
    public void mousePressed(GWindowEvent e)
    {
        // mouse coordinates
		int x = e.getX();
		int y = e.getY();

        // Print the mouse coordinates
		System.out.println("x="+x+" y="+y);

        // Display a circle of radius 30 
		// centered at the click location.
		// The color of the circle is random.
		if (this.isInAddMode)
		{
			Random r = new Random(System.currentTimeMillis());
			Color c = new Color(r.nextFloat(),r.nextFloat(),
								r.nextFloat());
			Oval circle = new Oval(x-30,y-30,60,60,c,true);
			this.circles.add(circle);
			this.window.add(circle);
    	}
		else
		{
			// erase the circle where the click is (if there 
			// is such a circle)
			for(int i=circles.size()-1; i>=0; i--)
			{
				Oval circle = (Oval)circles.get(i);
				// center of the circle
				int xc = circle.getX()+circle.getWidth()/2;
				int yc = circle.getY()+circle.getHeight()/2;
				// radius of the circle
				int r = circle.getWidth()/2;
				// Is (x,y) in the circle?
				if ( (x-xc)*(x-xc)+(y-yc)*(y-yc)<=r*r )
				{
					window.remove(circle);
					circles.remove(circle);
					break;
				}
			}
			window.doRepaint();
		}
	}

	/**
	 * Toggle between add and erase mode by pressing
	 * any key
	 */
	public void keyPressed(GWindowEvent e)
	{
		this.isInAddMode = !this.isInAddMode;
	}
}