/*
   Expanding Square Example Program
 
   This program starts out with a small sold square centered in the graphics
   window and instructions to click inthe window.  On each click, the square
   gets bigger, but remains centered.  If the mouse leaves the window the square
   goes back to it's original size and the text says "Start again!" in large, 
   bold, italic letters, going back to the original text when the mouse
   re-eners the window. The program will take into account a resizing of the 
   window by the user and start the squares at the center of the new window.
   
 */

import objectdraw.*;
import java.awt.*;

public class ExpandingSquare extends FrameWindowController {

    private static final int INITIAL_SIDE_LENGTH = 10;
    
    private static final int SQUARE_SIDE_INCREMENT = 20;
    
    private FilledRect square;

    public void begin() {    
        
        // create the small black square in the center of the canvas
        square = new FilledRect(canvas.getWidth()/2 - INITIAL_SIDE_LENGTH/2, 
				canvas.getHeight()/2 - INITIAL_SIDE_LENGTH/2, 
				INITIAL_SIDE_LENGTH, INITIAL_SIDE_LENGTH, canvas);      
    }
        
    public void onMousePress (Location point) {
        
        // increases the size of the square by SQUARE_SIDE_INCREMENT and keeps it centered
        square.setHeight(square.getHeight() + SQUARE_SIDE_INCREMENT);
        square.setWidth(square.getWidth() + SQUARE_SIDE_INCREMENT);
        square.move(-SQUARE_SIDE_INCREMENT/2, -SQUARE_SIDE_INCREMENT/2);
        
    }

}