Method reflect

src/main/java/field/linalg/Vec2.java:1174–1179

Reflect this vector about the given normal vector. @param normal the vector to reflect about @return this

(Vec2 normal)

     * @return this
     */
    public Vec2 reflect(Vec2 normal) {
        double dot = this.dot(normal);
        x = x - 2.0 * dot * normal.x;
        y = y - 2.0 * dot * normal.y;
        return this;
    }

    /**
     * Reflect this vector about the given normal vector.