# -*- coding: utf-8 -*-
# characters.py - module for shared functions and macros
# This file is part of brutalmaze
#
# brutalmaze is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# brutalmaze is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with brutalmaze.  If not, see <http://www.gnu.org/licenses/>.
#
# Copyright (C) 2017 Nguyễn Gia Phong

from math import cos, sin, pi

import pygame
from pygame.gfxdraw import filled_polygon, aapolygon

from .constants import MIDDLE

__doc__ = 'brutalmaze module for hero and enemy classes'


def round2(number):
    """Round a number to an int."""
    return int(round(number))


def randsign():
    """Return either -1 or 1 (kind of) randomly."""
    return (pygame.time.get_ticks() & 1)*2 - 1


def regpoly(n, R, r, x, y):
    """Return the pointlist of the regular polygon with n sides,
    circumradius of R, the center point I(x, y) and one point A make the
    vector IA with angle r (in radians).
    """
    r %= pi * 2
    angles = [r + pi*2*side/n for side in range(n)]
    return [(x + R*cos(angle), y + R*sin(angle)) for angle in angles]


def fill_aapolygon(surface, points, color):
    """Draw a filled polygon with anti aliased edges onto a surface."""
    aapolygon(surface, points, color)
    filled_polygon(surface, points, color)


def pos(x, y, distance, middlex, middley):
    """Return coordinate of the center of the grid (x, y)."""
    return middlex + (x - MIDDLE)*distance, middley + (y - MIDDLE)*distance


def sign(n):
    """Return the sign of number n."""
    return -1 if n < 0 else 1 if n else 0


def cosin(x):
    """Return the sum of cosine and sine of x (measured in radians)."""
    return cos(x) + sin(x)


def length(x0, y0, x1, y1):
    """Return the length of the line segment joining the two points
    (x0, y0) and (x1, y1).
    """
    return ((x0-x1)**2 + (y0-y1)**2)**0.5