def update_aabb(self):
self.aabb = QRectF(0.0, 0.0, 0.0, 0.0)
for child in self.children:
self.aabb = self.aabb.united(child.aabb)
if self.attachedObject is not None:
self.aabb = QRectF.united(self.aabb,
self.attachedObject.get_world_aabb())
if self.parent is not None:
self.parent.update_aabb()
return
class SceneNode:
def __init__(self):
self.worldPosition = QVector2D(0.0, 0.0)
self.worldRotation = 0.0
self.worldScale = QVector2D(1.0, 1.0)
self.worldTransform = QTransform()
self.parent = None
self.children = []
self.transformChanged = True
self.attachedObject = None
self.aabb = QRectF(0.0, 0.0, 0.0, 0.0)
self.update_transform()
return
def get_world_position(self):
return self.worldPosition
def set_world_position(self, pos):
self.worldPosition = pos
self.transformChanged = True
return
def get_world_rotation(self):
return self.worldRotation
def set_world_rotation(self, angle):
self.worldRotation = angle
self.transformChanged = True
return
def get_world_scale(self):
return self.worldScale
def set_world_scale(self, scale):
self.worldScale = scale
self.transformChanged = True
return
def update_transform(self):
if self.transformChanged:
translation = QTransform()
translation = translation.fromTranslate(self.worldPosition[0],
self.worldPosition[1])
scale = QTransform()
scale = scale.fromScale(self.worldScale[0], self.worldScale[1])
rot = QTransform()
rot = rot.rotate(self.worldRotation)
self.worldTransform = scale * rot * translation
self.transformChanged = False
self.update_aabb()
return
def get_world_transform(self) -> QTransform:
return self.worldTransform
def update_aabb(self):
self.aabb = QRectF(0.0, 0.0, 0.0, 0.0)
for child in self.children:
self.aabb = self.aabb.united(child.aabb)
if self.attachedObject is not None:
self.aabb = QRectF.united(self.aabb,
self.attachedObject.get_world_aabb())
if self.parent is not None:
self.parent.update_aabb()
return
def attach_child(self, child):
assert child is not None
assert child not in self.children
self.children.append(child)
child.parent = self
return
def detach_child(self, child):
assert child is not None
assert child in self.children
self.children.remove(child)
child.parent = None
return
def detach_all(self):
for child in self.children:
child.parent = None
self.children = []
return
def change_parent(self, parent):
if self.parent is not None:
self.parent.detach_child(self)
if parent is not None:
self.parent.attach_child(self)
else:
self.parent = None
return
def attach_object(self, obj):
assert obj is not None
self.attachedObject = obj
obj.node = self
self.update_aabb()
return
def detach_object(self, obj):
assert obj is not None
self.attachedObject = None
obj.node = None
self.update_aabb()
return