RollingRock

import java.awt.Color;

import info.gridworld.actor.Actor;
import info.gridworld.actor.Rock;
import info.gridworld.grid.Grid;
import info.gridworld.grid.Location;

public class RollingRock extends Rock {

    private static final Color DEFAULT_COLOR = Color.BLACK;

    /**
     * Constructs a black rock.
     */
    public RollingRock()
    {
        setColor(DEFAULT_COLOR);
        setDirection(135);
    }

    /**
     * Constructs a rock of a given color.
     * @param rockColor the color of this rock
     */
    public RollingRock(Color rockColor)
    {
        setColor(rockColor);
        setDirection(135);
    }

    /**
     * Rolls the rock
     */
    public void act()
    {
        roll();
    }

    /**
     * Rolls the rock forward
     */
    public void roll()
    {
        Grid<Actor> gr = getGrid();
        if (gr == null)
            return;
        Location loc = getLocation();
        Location next = loc.getAdjacentLocation(getDirection());
        if (gr.isValid(next))
            moveTo(next);
        else
            removeSelfFromGrid();
    }

}