/*
 * @(#)WormFood.java	1.8 02/07/25 @(#)
 *
 * Copyright (c) 2001 Sun Microsystems, Inc.  All rights reserved.
 * PROPRIETARY/CONFIDENTIAL
 * Use is subject to license terms.
 */

/*
 * WormFood.java
 *
 * Created on March 30, 2001, 16:15
 * @author Todd M Kennedy
 * @version 1.0
 */

package example.wormgame;

import javax.microedition.lcdui.Graphics;

/**
 * WormFood is a food item that the worm can eat. It is placed at
 * a pseudo randomly generated location in the pit.
 */
public class WormFood {
    /** Current food location x coordinate in cells. */
    private int cellX;
    /** Current food location y coordinate in cells. */
    private int  cellY;            

    /*
     * These members are for convenience only. They are generated using
     * expensive multiplication operations and are cached for quick access
     */
    /** Current food location x coordinate in pixels. */
    private int x;
    /** Current food location y coordinate in pixels. */
    private int y;         
    /** Size of arena in cells. */
    private long arenaSize;              

    /**
     * Constructor for worm food object.
     * @param pit pit to which the food is associated. (unused currently)
     */
    public WormFood(WormPit pit) {
	arenaSize = WormPit.CellWidth * WormPit.CellHeight;
	regenerate();
    }

    /**
     * Returns true if the food item is at the given cell.
     * @param cx x coordinate of cell to test
     * @param cy y coordinate of cell to test
     * @return true, if the food is at the cell coordinate
     */
    public boolean isAt(int cx, int cy) {
	return ((this.cellX == cx) && (this.cellY == cy));
    }

    /**
     * Get the X coordinate of the cell that contains the food item.
     * @return x coordinate of food cell location
     */
    public int getX() {
	return cellX;
    }

    /**
     * Get the Y coordinate of the cell that contains the food item.
     * @return y coordinate of food cell location
     */
    public int getY() {
	return cellY;
    }

    /**
     * Regenerate the food item. Whenever the worm eats a piece of
     * food, this method is called.
     */
    public void regenerate() {
	int loc = (int)(System.currentTimeMillis() % arenaSize);
	cellY = (int)(loc / WormPit.CellWidth);
	cellX = (int)(loc % WormPit.CellHeight);
	y = cellY * WormPit.CELL_SIZE;      // Cache to save time during paint
	x = cellX * WormPit.CELL_SIZE;      // Cache to save time during paint
    }

    /**
     * Paint the piece of food.
     * @param g graphics object to receive rendering of food object
     */
    public void paint(Graphics g) {
	g.setColor(WormPit.FOOD_COLOUR);
	g.fillRect(x+1, y+1, WormPit.CELL_SIZE-2, WormPit.CELL_SIZE-2);
	g.setColor(WormPit.DRAW_COLOUR);
	g.drawRect(x, y, WormPit.CELL_SIZE-1, WormPit.CELL_SIZE-1);
    }

}