Question

Create the following class to represent the sprite objects in the game.

Sprite

Name: String x: x location y: y location

+   Sprite (String);       +   Sprite (String, int, int);            +   setName (String): void       +   setX(int): void       +   setY(int): void       +   getName (): String       +   getX (): int       +   getY (): int       +   collide (Sprite): boolean       +   toString (): String

Create ten (10) game objects as Sprite type and stored in an array. All the games objects location (x & y) must be set in range 1 to 800 randomly.

The collide method is a method to test the collision between the current sprite with another sprite (from parameter). This method will check the distance in between two sprites based on the current x and y location using Pythagoras theorem. If the distance of 2 objects is less than 10, then the method will return true. Otherwise false will be returned.

Create a driver class called TestSprite which will:

• Display all the game sprite objects with a loop
• Use the games objects from the array, test all the instance methods.

Answer 1

Here are the 2 classes - Sprite.java and TestSprite.java

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public class Sprite {

    private String name;
    private int x;
    private int y;

    public Sprite(String name) {
        this.name = name;
        x = y = 0;
    }

    public Sprite(String name, int x, int y) {
        this.name = name;
        this.x = x;
        this.y = y;
    }

    public void setX(int x) {
        this.x = x;
    }

    public void setY(int y) {
        this.y = y;
    }

    public String getName() {
        return name;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public boolean collide(Sprite aSprite) {

        int distance = (x - aSprite.getX()) * (x - aSprite.getX()) +
                (y - aSprite.getY()) * (x - aSprite.getY());

        return distance <= 100;

    }


    public String toString() {
        return "Sprite Name: " + name + ", Location (" + x + "," + y + ")";
    }

}

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import java.util.Random;

public class TestSprite {
    public static void main(String[] args) {

        Sprite[] sprites = new Sprite[10];
        Random r = new Random();
        sprites[0] = new Sprite("Mercury", r.nextInt(800) + 1, r.nextInt(800) + 1);
        sprites[1] = new Sprite("Venus", r.nextInt(800) + 1, r.nextInt(800) + 1);
        sprites[2] = new Sprite("Earth", r.nextInt(800) + 1, r.nextInt(800) + 1);
        sprites[3] = new Sprite("Mars", r.nextInt(800) + 1, r.nextInt(800) + 1);
        sprites[4] = new Sprite("Jupiter", r.nextInt(800) + 1, r.nextInt(800) + 1);
        sprites[5] = new Sprite("Saturn", r.nextInt(800) + 1, r.nextInt(800) + 1);
        sprites[6] = new Sprite("Uranus", r.nextInt(800) + 1, r.nextInt(800) + 1);
        sprites[7] = new Sprite("Neptune", r.nextInt(800) + 1, r.nextInt(800) + 1);
        sprites[8] = new Sprite("Pluto", r.nextInt(800) + 1, r.nextInt(800) + 1);
        sprites[9] = new Sprite("Moon", r.nextInt(800) + 1, r.nextInt(800) + 1);

        System.out.println("Sprite Details: ");
        for (int i = 0; i < sprites.length; i++) {
            System.out.println("Name: " + sprites[i].getName() + " X: " + sprites[i].getX() + ", Y: " + sprites[i].getY());
        }

        System.out.println("\nCollision Status:");
        for (int i = 0; i < sprites.length - 1; i++) {
            for (int j = i + 1; j < sprites.length; j++) {
                if (sprites[i].collide(sprites[j])) {
                    System.out.println(sprites[i] + " collides with " + sprites[j]);
                }
            }
        }

    }
}

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