APL/Fun/TestGraphique/Vector2.java

import java.awt.Point;

public class Vector2 extends Point {
    public Vector2(int x, int y) {
        super(x, y);
    }
    
    public void add(Point p) {
        this.x += p.x;
        this.y += p.y;
    }

    public void sub(Point p) {
        this.x -= p.x;
        this.y -= p.y;
    }

    public void mul(Point p) {
        this.x *= p.x;
        this.y *= p.y;
    }

    public void mul(int n) {
        this.x *= n;
        this.y *= n;
    }

    public static Vector2 lerp(Point a, Point b, double t) {
        double ax = (double)a.x;
        double bx = (double)b.x;
        double ay = (double)a.y;
        double by = (double)b.y;
        
        return new Vector2((int)(ax + (bx - ax) * t), (int)(ay + (by - ay) * t));
    }

    public void lerpTo(Point a, double t) {
        double ax = (double)this.x;
        double bx = (double)a.x;
        double ay = (double)this.y;
        double by = (double)a.y;

        this.x = (int)(ax + (bx - ax) * t);
        this.y = (int)(ay + (by - ay) * t);
    }

    public double length() {
        double x = (double)this.x;
        double y = (double)this.y;
    
        return Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
    }

    public void normalize() {
        double x = (double)this.x;
        double y = (double)this.y;
        double length = this.length();

        this.x = (int)(x / length);
        this.y = (int)(y / length);
    }

    public Vector2 toLocal(Point p) {
        return new Vector2(p.x - this.x, p.y - this.y);
    }
}