/**
 * Sprite.java
 * @author Jeff Ondich, 5 November 2010
 *
 * The abstract parent class for Sprites in the Playground example.
 */

import java.awt.*;

public abstract class Sprite
{
    protected int positionX;
    protected int positionY;
    private int velocityX;
    private int velocityY;

    public static Sprite createSprite(String spriteType, int x, int y, int vx, int vy, Color color)
    {
        if (spriteType.equals("square")) {
            return new SquareSprite(x, y, vx, vy, color);
        } else if (spriteType.equals("circle")) {
            return new CircleSprite(x, y, vx, vy, color);
        } else if (spriteType.equals("moose")) {
            return new MooseSprite(x, y, vx, vy, color);
        } else {
            return new SquareSprite(x, y, vx, vy, color);
        }
    }

    public Sprite(int x, int y, int vx, int vy)
    {
        this.positionX = x;
        this.positionY = y;
        this.velocityX = vx;
        this.velocityY = vy;
    }

    /**
     * Moves the Sprite one step in the direction and magnitude
     * of its velocity.  Subclasses may want to supplement this
     * behavior (or not) by calling super.step() followed by
     * any desired additional stepping actions.
     */
    public void step()
    {
        this.positionX += this.velocityX;
        this.positionY += this.velocityY;
    }

    /**
     * Draws the Sprite at its current position in the specified
     * Graphics environment.
     */
    public abstract void draw(Graphics g);
}