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Sprite Class


The BorlandBase library has a class called Sprite. A sprite is an image or graphic that moves around your screen. Mario, etc are known as sprites.
All sprites share some characteristics. They all:

  • have an x and a y
  • have a width and a height

They may also have:

  • an image

Two ways to construct:

  • super(x,y,width,height)
  • super(x,y,width,height,filename) //if there is an image file

Two nice methods that are built in to Sprites are:

  • drawImage(Graphics g) //if you loaded the image with super above)
  • drawImage(Graphics g,String filename)
  • playSound(String filename)
  • isCollision(Sprite otherSprite)

To use the sprite, you will extend my class, below are two examples:

public class Paddle extends Sprite

    //The constructor creates the paddle
    public Paddle(int x)
		super(x,100,20,75); // we are saying that the paddle will be at x of whatever they specify, y of 100, width of 20 and height of 75
    //other methods like moveUp, moveDown, drawPaddle() will all be below.

And if we wanted to have a sprite with an image:

public class Mario extends Sprite

    //The constructor creates the paddle
    public Mario()
		super(50,100,20,30, "mario.jpg"); // we are saying that the mario will be at x of 50, y of 100, width of 20 and height of 30
    //other methods like moveUp, moveDown will all be below.

In our main program:


We could create a paddle (or 2 or three) by saying:

Paddle paddle1=new Paddle(600); //note Im putting a paddle at x of 600

Or mario:

Mario myMario = new Mario();


There are some really useful methods built in:

  • Collision - we could see if the paddle is hitting mario:

if (paddle1.isCollision(myMario)==true) //if there is a collision

  • We can automatically draw mario at its location: