Import actors.py and vector.py from libtatlin

printrun/libtatlin/vector.py

+# -*- coding: utf-8 -*-
+# Copyright (C) 2011 Denis Kobozev
+#
+# This program 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 2 of the License, or
+# (at your option) any later version.
+#
+# This program 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 this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+from __future__ import division
+
+import numpy
+import math
+
+
+_identity_matrix = [
+    [1.0, 0.0, 0.0],
+    [0.0, 1.0, 0.0],
+    [0.0, 0.0, 1.0],
+]
+
+_rotation_matrix_cache = {}
+
+
+def identity_matrix():
+    return numpy.require(_identity_matrix[:], 'f')
+
+def rotation_matrix(angle, x, y, z):
+    angle_r = math.radians(angle)
+    c = math.cos(angle_r)
+    s = math.sin(angle_r)
+    C = 1 - c
+    matrix = numpy.require([
+        [x ** 2 * C + c,    x * y * C - z * s, x * z * C + y * s],
+        [y * x * C + z * s, y ** 2 * C + c,    y * z * C - x * s],
+        [x * z * C - y * s, y * z * C + x * s, z ** 2 * C + c],
+    ], 'f')
+    return matrix
+
+def translate(vertices, x, y, z):
+    translated = vertices + numpy.array([x, y, z], 'f')
+    return translated
+
+def rotate(vertices, angle, x, y, z):
+    key = (angle, x, y, z)
+    if key not in _rotation_matrix_cache:
+        _rotation_matrix_cache[key] = rotation_matrix(angle, x, y, z)
+
+    matrix = _rotation_matrix_cache[key]
+    rotated = numpy.dot(vertices, matrix)
+    return rotated
+