java.lang.Object | +----Vector2
public double x
public double y
public Vector2 flip_y_axis()
public Vector2 rotate(double degree)
public Vector2 normalize()
public Vector2 scale(double scale)
public double length()
public double inner_product(Vector2 v)
public double outer_product(Vector2 v)
public double get_cos(Vector2 v)
public double get_sin(Vector2 v)
public static double distance(int x1, int y1, int x2, int y2)
public static double distance(double x1, double y1, double x2, double y2)