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24 lines (23 loc) · 816 Bytes
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Copy pathscene.py
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24 lines (23 loc) · 816 Bytes
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from geometry import identity
from shape import Shape, SceneObject
class Scene(SceneObject):
def __init__(self, nodes=None, transform=None):
if transform is None:
transform = identity()
if nodes is None:
nodes = []
self.transform = transform
self.nodes = nodes
def add(self, node):
self.nodes.append(node)
def draw(self, image):
for scene_object in self.traverse(identity()):
scene_object.draw(image)
def traverse(self, xform):
this_xform = xform * self.transform
for node in self.nodes:
if isinstance(node, Scene):
for n in node.traverse(this_xform):
yield n
elif isinstance(node, Shape):
yield node.transform(this_xform)