def setUp(self):
self.directory = tempfile.mkdtemp()
f = open(os.path.join(self.directory, "color_levels.xml"), "w")
f.write(toxml(tag.Object({"class" : "CloudColorLevels"})))
f.close()
f = open(os.path.join(self.directory, "opacity_levels.xml"), "w")
f.write(toxml(tag.Object({"class" : "CloudOpacityLevels"})))
f.close()
f = open(os.path.join(self.directory, "lod.xml"), "w")
f.write(toxml(tag.Object({"class" : "CloudLOD"})))
f.close()
def generate(self):
# Things to improve:
# * Remove sprites that are too close. What distance should this be?
#
# * Sprites near the center of the cloudbox could be much larger than
# the ones near the edges? This to reduce the number of sprites
# needed.
if not os.path.exists(self.directory):
raise IOError, "Directory %s not found" % self.directory
if not self.filename.endswith(".xml"):
raise CloudBoxException, "Filename doesn't have .xml extension"
class Sprite(object):
def __init__(self, position, rotation, size):
self.position = position
self.rotation = rotation
self.size = size
sprites = []
def inside_ellipsoid(x, y, z):
value1 = \
(x * x) / (self.width * self.width) + \
(y * y) / (self.depth * self.depth)
value2 = \
(x * x) / (self.width * self.width) + \
(z * z) / (self.height * self.height)
value3 = \
(y * y) / (self.depth * self.depth) + \
(z * z) / (self.height * self.height)
return value1 < 1 and value2 < 1 and value3 < 1
def inside_box(x, y, z):
return True
bounds_checker = inside_box
if self.ellipsoid:
bounds_checker = inside_ellipsoid
# first we generate X number of sprites.
while len(sprites) < self.sprite_count:
x = random.uniform(0 - self.width, self.width)
y = random.uniform(0 - self.depth, self.depth)
z = random.uniform(0 - self.height, self.height)
if bounds_checker(x, y, z):
rotation = random.uniform(0, 6.28)
width = self.sprite_size
height = self.sprite_size
sprites.append(Sprite((x, y, z), rotation, (width, height)))
# This section provides detection if sprites are too close to each
# other. Commented it out for the time beeing since it doesn't
# work well. Wonder what distance is best to use?
# index = len(sprites) - 1
# while index >= 0:
# index2 = len(sprites) - 1
#
# while index2 >= 0:
# # don't compare with myself
# if index != index2:
# s1 = sprites[index]
# s2 = sprites[index2]
# delta = (
# s1.position[0] - s2.position[0],
# s1.position[1] - s2.position[1],
# s1.position[2] - s2.position[2])
# distance = math.sqrt(delta[0] * delta[0] + delta[1] * delta[1] + delta[2] * delta[2])
# if distance < self.sprite_size:
# # print("Removing sprite since distance was only: %.2f" % distance)
# del sprites[index]
# break
# index2 = index2 - 1
#
# index = index - 1
with open(os.path.join(self.directory, self.filename), "w") as f:
xml = tag.Object(
{"class" : "CloudBox"},
tag.Path(self.lod_path, name="lod"),
tag.Path(self.color_path, name="color"),
tag.Path(self.opacity_path, name="opacity"),
tag.Vector3("%d %d %d" % (self.width, self.depth, self.height), name="size"),
tag.List(*tuple([(
tag.Object({"class":"CloudSprite"},
tag.Vector3("%.1f %.1f %.1f" %
(sprite.position[0],
sprite.position[1],
sprite.position[2]),
name="position"),
tag.Float("%.1f" % sprite.rotation,
name="rotation"),
tag.Vector2("%.1f %.1f" %
(sprite.size[0],
sprite.size[1]),
name="size"))
) for sprite in sprites]), name="sprites")
)
xml_str = toxml(xml, pretty_print=True)
f.write(xml_str)
f.flush()
return xml_str
