import image.Circle;
import image.Image;
import image.Scene;
import image.Square;
import world.Posn;

// Represents a Grid Position
abstract class AGrid extends Posn
{
	int CELL_SIZE = 20;
	int CELL_WIDTH = 20;
	int CELL_HEIGHT = 20;

	int WIDTH = this.CELL_WIDTH * this.CELL_SIZE;
	int HEIGHT = this.CELL_HEIGHT * this.CELL_SIZE;

	Image segImage = new Circle(this.CELL_SIZE, "solid", "red");
	Image foodImage = new Square(this.CELL_SIZE, "solid", "green");

	AGrid(int x, int y)
	{
		super(x,y);
	} // AGrid(int, int) ctor

	/* Inventory:
	 * 	Fields:
	 * 		... this.x ... -- int
	 * 		... this.y ... -- int
	 *
	 * 	Methods:
	 * 		... this.cell2Pixel() ...		-- Posn
	 * 		... this.tock(String) ...		-- AGrid	abstract
	 * 		... this.drawAGrid(Scene) ...	-- AGrid	abstract
	 */

	// Calculate the pixel-coords from cell-coord
	Posn cell2Pixel()
	{
		/*
		 * Design:
		 *
		 */
		return new Posn(this.CELL_SIZE * this.x + this.CELL_SIZE / 2,
						this.CELL_SIZE * this.y + this.CELL_SIZE / 2);
	} // cell2Pixel()

	// return AGrid tocked according to the direction
	public abstract AGrid tock(String dir);

	// return AGrid drawn onto the scene according to its x & y
	public abstract Scene drawAGrid(Scene scene);

	// return AGrid onKeyed according to the key event
	public abstract AGrid onKey(String ke);

	// is this AGrid off the screen?
	public abstract boolean offScreen();

	// is this AGrid hitting the rest?
	public abstract boolean hitSelf(ILoS rest);

} // AGrid abstract class