sprite.java

这是本人写的JAVA游戏编程中的一些基本游戏功能的可复用类

import java.awt.Image;

public class Sprite 
{

    private Animation anim;
    // position (pixels)
    private float x;
    private float y;
    // velocity (pixels per millisecond)
    private float dx;
    private float dy;

    /**
        Creates a new Sprite object with the specified Animation.
    */
    public Sprite(Animation anim) 
    {
        this.anim = anim;
    }

    /**
        Updates this Sprite's Animation and its position based
        on the velocity.
    */
    public void update(long elapsedTime) 
   {
        x += dx * elapsedTime;
        y += dy * elapsedTime;
        anim.update(elapsedTime);
    }

    /**
        Gets this Sprite's current x position.
    */
    public float getX() 
    {
        return x;
    }

    /**
        Gets this Sprite's current y position.
    */
    public float getY() 
    {
        return y;
    }

    /**
        Sets this Sprite's current x position.
    */
    public void setX(float x) 
    {
        this.x = x;
    }

    /**
        Sets this Sprite's current y position.
    */
    public void setY(float y) 
    {
        this.y = y;
    }

    /**
        Gets this Sprite's width, based on the size of the
        current image.
    */
    public int getWidth()
    {
        return anim.getImage().getWidth(null);
    }

    /**
        Gets this Sprite's height, based on the size of the
        current image.
    */
    public int getHeight() 
    {
        return anim.getImage().getHeight(null);
    }

    /**
        Gets the horizontal velocity of this Sprite in pixels
        per millisecond.
    */
    public float getVelocityX() 
    {
        return dx;
    }

    /**
        Gets the vertical velocity of this Sprite in pixels
        per millisecond.
    */
    public float getVelocityY() 
   {
        return dy;
    }

    /**
        Sets the horizontal velocity of this Sprite in pixels
        per millisecond.
    */
    public void setVelocityX(float dx)
    {
        this.dx = dx;
    }

    /**
        Sets the vertical velocity of this Sprite in pixels
        per millisecond.
    */
    public void setVelocityY(float dy)
    {
        this.dy = dy;
    }

    /**
        Gets this Sprite's current image.
    */
    public Image getImage() 
    {
        return anim.getImage();
    }
}