import java.awt.Color;

import java.awt.Graphics;

/**

* A square at a fixed location that changes color.

*

* @author Chris Mayfield

* @version 7.1.0

*/

public class Cell {

public static final Color[] COLORS = {Color.WHITE, Color.BLACK};

private final int x;

private final int y;

private final int size;

private int state;

/**

* Constructs a new cell, initially turned off.

*

* @param x the X coordinate

* @param y the Y coordinate

* @param size number of pixels

*/

public Cell(int x, int y, int size) {

this.x = x;

this.y = y;

this.size = size;

this.state = 0;

}

/**

* Draws the cell on the screen.

*

* @param g graphics context

*/

public void draw(Graphics g) {

g.setColor(COLORS[state]);

g.fillRect(x + 1, y + 1, size - 1, size - 1);

g.setColor(Color.LIGHT_GRAY);

g.drawRect(x, y, size, size);

}

/**

* Tests whether the cell is off.

*

* @return true if the cell is off

*/

public boolean isOff() {

return state == 0;

}

/**

* Tests whether the cell is on.

*

* @return true if the cell is on

*/

public boolean isOn() {

return state == 1;

}

/**

* Sets the cell's state to off.

*/

public void turnOff() {

state = 0;

}

/**

* Sets the cell's state to on.

*/

public void turnOn() {

state = 1;

}

}