CODEWITHSUNDEEP
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daGrevis
daGrevis

Reputation: 21333

How to Store Vectors in Java? What's the Data Type?

I just read this tutorial. It's about game development, and it basically says that I need to store acceleration, velocity, position as vectors to make game physics. Hope it makes sense! I need to choose data type now... for example I need to store values like...

(3, 5, 2)

(6, 2, 3)

(2, 3)

Also, I will need to do addition and subtraction like this...

(0, 1, 4) + (3, -2, 5) = (0 + 3, 1 - 2, 4 + 5) = (3, -1,9)

What data type should I use in this situation?

For one vector two integers (floats/doubles) maybe? Maybe array for one vector where where values are integers (floats/doubles)?

Upvotes: 0

Views: 3556

Answers (3)

duffymo
duffymo

Reputation: 308988

Or you can use generics:

public interface MathVector<T extends Number>
{
    MathVector<T> add(MathVector<T> addend);
    T innerProduct();
    // Vectors have more than this, but it makes the point
}

Upvotes: 0

Bozho
Bozho

Reputation: 597344

Perhaps commons-math OpenMapRealVector can be of use.

Upvotes: 1

Jon Skeet
Jon Skeet

Reputation: 1503050

Sounds like you want three values (probably doubles):

public class Vector3
{
    private final double x;
    private final double y;
    private final double z;

    public Vector3(double x, double y, double z)
    {
        this.x = x;
        this.y = y;
        this.z = z;
    }

    public Vector3 plus(Vector3 other)
    {
        return new Vector3(x + other.x, y + other.y, z + other.z);
    }

    // etc
}

Note that I've made this immutable - which isn't always the best choice for performance (which may be relevant in your situation) but helps with readability.

Upvotes: 8

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