1 files changed, 70 insertions, 0 deletions
diff --git a/brutalmaze/utils.py b/brutalmaze/utils.py
new file mode 100644
index 0000000..d198ef5
--- /dev/null
+++ b/brutalmaze/utils.py
@@ -0,0 +1,70 @@
+# -*- 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
+
+__doc__ = 'brutalmaze module for hero and enemy classes'
+
+from math import cos, sin, pi
+
+import pygame
+from pygame.gfxdraw import filled_polygon, aapolygon
+
+from .constants import *
+
+
+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