def __init__(self):
# composition stuff
#: list of (int, child-reference) where int is the z-order, sorted by ascending z (back to front order)
self.children = []
#: dictionary that maps children names with children references
self.children_names = {}
self._parent = None
# drawing stuff
#: x-position of the object relative to its parent's children_anchor_x value.
#: Default: 0
self._x = 0
#: y-position of the object relative to its parent's children_anchor_y value.
#: Default: 0
self._y = 0
#: a float, alters the scale of this node and its children.
#: Default: 1.0
self._scale = 1.0
#: a float, alters the horizontal scale of this node and its children.
#: total scale along x axis is _scale_x * _scale
#: Default: 1.0
self._scale_x = 1.0
#: a float, alters the vertical scale of this node and its children.
#: total scale along y axis is _scale_y * _scale
#: Default: 1.0
self._scale_y = 1.0
#: a float, in degrees, alters the rotation of this node and its children.
#: Default: 0.0
self._rotation = 0.0
#: eye, center and up vector for the :class:`.Camera`.
#: gluLookAt() is used with these values.
#: Default: FOV 60, center of the screen.
#:
#: .. NOTE::
#: The camera can perform exactly the same
#: transformation as ``scale``, ``rotation`` and the
#: ``x``, ``y`` attributes (with the exception that the
#: camera can modify also the z-coordinate)
#: In fact, they all transform the same matrix, so
#: use either the camera or the other attributes, but not both
#: since the camera will be overridden by the transformations done
#: by the other attributes.
#:
#: You can change the camera manually or by using the
#: :class:`.Camera3DAction` action.
self.camera = Camera()
#: offset from (x,0) from where rotation and scale will be applied.
#: Default: 0
self.transform_anchor_x = 0
#: offset from (0,y) from where rotation and scale will be applied.
#: Default: 0
self.transform_anchor_y = 0
#: whether of not the object and his childrens are visible.
#: Default: True
self.visible = True
#: the grid object for the grid actions.
#: This can be a `Grid3D` or a `TiledGrid3D` object depending
#: on the action.
self.grid = None
# actions stuff
#: list of `Action` objects that are running
self.actions = []
#: list of `Action` objects to be removed
self.to_remove = []
#: whether or not the next frame will be skipped
self.skip_frame = False
# schedule stuff
self.scheduled = False # deprecated, soon to be removed
self.scheduled_calls = [] #: list of scheduled callbacks
self.scheduled_interval_calls = [
] #: list of scheduled interval callbacks
self.is_running = False #: whether of not the object is running
# matrix stuff
self.is_transform_dirty = False
self.transform_matrix = euclid.Matrix3().identity()
self.is_inverse_transform_dirty = False
self.inverse_transform_matrix = euclid.Matrix3().identity()
def __init__(self):
# composition stuff
#: list of (int, child-reference) where int is the z-order, sorted by ascending z (back to front order)
self.children = []
#: dictionary that maps children names with children references
self.children_names = {}
self._parent = None
# drawing stuff
#: x-position of the object relative to its parent's children_anchor_x value.
#: Default: 0
self._x = 0
#: y-position of the object relative to its parent's children_anchor_y value.
#: Default: 0
self._y = 0
#: a float, alters the scale of this node and its children.
#: Default: 1.0
self._scale = 1.0
#: a float, alters the horizontal scale of this node and its children.
#: total scale along x axis is _scale_x * _scale
#: Default: 1.0
self._scale_x = 1.0
#: a float, alters the vertical scale of this node and its children.
#: total scale along y axis is _scale_y * _scale
#: Default: 1.0
self._scale_y = 1.0
#: a float, in degrees, alters the rotation of this node and its children.
#: Default: 0.0
self._rotation = 0.0
#: eye, center and up vector for the :class:`.Camera`.
#: gluLookAt() is used with these values.
#: Default: FOV 60, center of the screen.
#:
#: .. NOTE::
#: The camera can perform exactly the same
#: transformation as ``scale``, ``rotation`` and the
#: ``x``, ``y`` attributes (with the exception that the
#: camera can modify also the z-coordinate)
#: In fact, they all transform the same matrix, so
#: use either the camera or the other attributes, but not both
#: since the camera will be overridden by the transformations done
#: by the other attributes.
#:
#: You can change the camera manually or by using the
#: :class:`.Camera3DAction` action.
self.camera = Camera()
#: offset from (x,0) from where rotation and scale will be applied.
#: Default: 0
self.transform_anchor_x = 0
#: offset from (0,y) from where rotation and scale will be applied.
#: Default: 0
self.transform_anchor_y = 0
#: whether of not the object and his childrens are visible.
#: Default: True
self.visible = True
#: the grid object for the grid actions.
#: This can be a `Grid3D` or a `TiledGrid3D` object depending
#: on the action.
self.grid = None
# actions stuff
#: list of `Action` objects that are running
self.actions = []
#: list of `Action` objects to be removed
self.to_remove = []
#: whether or not the next frame will be skipped
self.skip_frame = False
# schedule stuff
self.scheduled = False # deprecated, soon to be removed
self.scheduled_calls = [] #: list of scheduled callbacks
self.scheduled_interval_calls = [] #: list of scheduled interval callbacks
self.is_running = False #: whether of not the object is running
# matrix stuff
self.is_transform_dirty = False
self.transform_matrix = euclid.Matrix3().identity()
self.is_inverse_transform_dirty = False
self.inverse_transform_matrix = euclid.Matrix3().identity()
class CocosNode(object):
"""
Cocosnode is the main element. Anything that gets drawn or contains things
that gets drawn is a :class:`CocosNode`.
The most popular :class:`CocosNode` are :class:`cocos.scene.Scene`,
:class:`cocos.layer.base_layers.Layer` and :class:`cocos.sprite.Sprite`.
The main features of a :class:`CocosNode` are:
- They can contain other :class:`CocosNode` (:meth:`add`, :meth:`get`,
:meth:`remove`, etc)
- They can schedule periodic callback (:meth:`schedule`,
:meth:`schedule_interval`, etc)
- They can execute actions (:meth:`do`, :meth:`pause`, :meth:`stop`,
etc)
Some :class:`CocosNode` provide extra functionality for them or their
children.
Subclassing a :class:`CocosNode` usually means (one/all) of:
- overriding ``__init__`` to initialize resources and schedule callbacks
- create callbacks to handle the advancement of time
- overriding :meth:`draw` to render the node
"""
def __init__(self):
# composition stuff
#: list of (int, child-reference) where int is the z-order, sorted by ascending z (back to front order)
self.children = []
#: dictionary that maps children names with children references
self.children_names = {}
self._parent = None
# drawing stuff
#: x-position of the object relative to its parent's children_anchor_x value.
#: Default: 0
self._x = 0
#: y-position of the object relative to its parent's children_anchor_y value.
#: Default: 0
self._y = 0
#: a float, alters the scale of this node and its children.
#: Default: 1.0
self._scale = 1.0
#: a float, alters the horizontal scale of this node and its children.
#: total scale along x axis is _scale_x * _scale
#: Default: 1.0
self._scale_x = 1.0
#: a float, alters the vertical scale of this node and its children.
#: total scale along y axis is _scale_y * _scale
#: Default: 1.0
self._scale_y = 1.0
#: a float, in degrees, alters the rotation of this node and its children.
#: Default: 0.0
self._rotation = 0.0
#: eye, center and up vector for the :class:`.Camera`.
#: gluLookAt() is used with these values.
#: Default: FOV 60, center of the screen.
#:
#: .. NOTE::
#: The camera can perform exactly the same
#: transformation as ``scale``, ``rotation`` and the
#: ``x``, ``y`` attributes (with the exception that the
#: camera can modify also the z-coordinate)
#: In fact, they all transform the same matrix, so
#: use either the camera or the other attributes, but not both
#: since the camera will be overridden by the transformations done
#: by the other attributes.
#:
#: You can change the camera manually or by using the
#: :class:`.Camera3DAction` action.
self.camera = Camera()
#: offset from (x,0) from where rotation and scale will be applied.
#: Default: 0
self.transform_anchor_x = 0
#: offset from (0,y) from where rotation and scale will be applied.
#: Default: 0
self.transform_anchor_y = 0
#: whether of not the object and his childrens are visible.
#: Default: True
self.visible = True
#: the grid object for the grid actions.
#: This can be a `Grid3D` or a `TiledGrid3D` object depending
#: on the action.
self.grid = None
# actions stuff
#: list of `Action` objects that are running
self.actions = []
#: list of `Action` objects to be removed
self.to_remove = []
#: whether or not the next frame will be skipped
self.skip_frame = False
# schedule stuff
self.scheduled = False # deprecated, soon to be removed
self.scheduled_calls = [] #: list of scheduled callbacks
self.scheduled_interval_calls = [
] #: list of scheduled interval callbacks
self.is_running = False #: whether of not the object is running
# matrix stuff
self.is_transform_dirty = False
self.transform_matrix = euclid.Matrix3().identity()
self.is_inverse_transform_dirty = False
self.inverse_transform_matrix = euclid.Matrix3().identity()
def make_property(attr):
types = {'anchor_x': "int", 'anchor_y': "int", "anchor": "(int, int)"}
def set_attr():
def inner(self, value):
setattr(self, "transform_" + attr, value)
return inner
def get_attr():
def inner(self):
return getattr(self, "transform_" + attr)
return inner
return property(get_attr(),
set_attr(),
doc="""a property to get fast access to transform_%s
:type: %s""" % (attr, types[attr]))
#: Anchor point of the object. Alias for :class:`transform_anchor`
#: Children will be added at this point
#: and transformations like scaling and rotation will use this point
#: as the center.
anchor = make_property("anchor")
#: Anchor x value for transformations and adding children. Alias for
#: :class:`transform_anchor_x`
anchor_x = make_property("anchor_x")
#: Anchor y value for transformations and adding children. Alias for
#: :class:`transform_anchor_y`
anchor_y = make_property("anchor_y")
def make_property(attr):
def set_attr():
def inner(self, value):
setattr(self, attr + "_x", value[0])
setattr(self, attr + "_y", value[1])
return inner
def get_attr(self):
return getattr(self, attr + "_x"), getattr(self, attr + "_y")
return property(get_attr,
set_attr(),
doc='''a property to get fast access to "+attr+"_[x|y]
:type: (int, int)
''')
#: Transformation anchor point. Children will be added at this point and
#: transformations like scaling and rotation
#: will use this point as its center.
transform_anchor = make_property("transform_anchor")
del make_property
def schedule_interval(self, callback, interval, *args, **kwargs):
"""
Schedule a function to be called every ``interval`` seconds.
Specifying an interval of 0 prevents the function from being
called again (see :meth:`schedule` to call a function as often as
possible).
The callback function prototype is the same as for :meth:`schedule`.
This function is a wrapper to ``pyglet.clock.schedule_interval``.
It has the additional benefit that all calllbacks are paused and
resumed when the node leaves or enters a scene.
You should not have to schedule things using pyglet by yourself.
Arguments:
callback (a function):
The function to call when the timer elapsed.
interval (float):
The number of seconds to wait between each call.
*args: Variable length argument list passed to the ``callback``.
**kwargs: Arbitrary keyword arguments passed to the ``callback``.
"""
if self.is_running:
pyglet.clock.schedule_interval(callback, interval, *args, **kwargs)
self.scheduled_interval_calls.append(
(callback, interval, args, kwargs))
def schedule(self, callback, *args, **kwargs):
"""
Schedule a function to be called every frame.
The function should have a prototype that includes ``dt`` as the
first argument, which gives the elapsed time, in seconds, since the
last clock tick. Any additional arguments given to this function
are passed on to the callback::
def callback(dt, *args, **kwargs):
pass
This function is a wrapper to ``pyglet.clock.schedule``.
It has the additional benefit that all calllbacks are paused and
resumed when the node leaves or enters a scene.
You should not have to schedule things using pyglet by yourself.
Arguments:
callback (a function):
The function to call each frame.
*args: Variable length argument list passed to the ``callback``.
**kwargs: Arbitrary keyword arguments passed to the ``callback``.
"""
if self.is_running:
pyglet.clock.schedule(callback, *args, **kwargs)
self.scheduled_calls.append((callback, args, kwargs))
def unschedule(self, callback):
"""
Remove a function from the schedule.
If the function appears in the schedule more than once, all occurances
are removed. If the function was not scheduled, no error is raised.
This function is a wrapper to pyglet.clock.unschedule.
It has the additional benefit that all calllbacks are paused and
resumed when the node leaves or enters a scene.
You should not unschedule things using pyglet that where scheduled
by :meth:`schedule`/:meth:`schedule_interval`.
Arguments:
callback (a function):
The function to remove from the schedule.
"""
self.scheduled_calls = [
c for c in self.scheduled_calls if c[0] != callback
]
self.scheduled_interval_calls = [
c for c in self.scheduled_interval_calls if c[0] != callback
]
if self.is_running:
pyglet.clock.unschedule(callback)
def resume_scheduler(self):
"""
Time will continue/start passing for this node and callbacks
will be called, worker actions will be called.
"""
for c, i, a, k in self.scheduled_interval_calls:
pyglet.clock.schedule_interval(c, i, *a, **k)
for c, a, k in self.scheduled_calls:
pyglet.clock.schedule(c, *a, **k)
def pause_scheduler(self):
"""
Time will stop for this node: scheduled callbacks will
not be called, worker actions will not be called.
"""
for f in set([x[0] for x in self.scheduled_interval_calls] +
[x[0] for x in self.scheduled_calls]):
pyglet.clock.unschedule(f)
for arg in self.scheduled_calls:
pyglet.clock.unschedule(arg[0])
def _get_parent(self):
if self._parent is None:
return None
else:
return self._parent()
def _set_parent(self, parent):
if parent is None:
self._parent = None
else:
self._parent = weakref.ref(parent)
parent = property(_get_parent,
_set_parent,
doc='''The parent of this object.
Returns:
CocosNode or None
''')
def get_ancestor(self, klass):
"""
Walks the nodes tree upwards until it finds a node of the class
``klass`` or returns None.
Returns:
CocosNode or None
"""
if isinstance(self, klass):
return self
parent = self.parent
if parent:
return parent.get_ancestor(klass)
#
# Transform properties
#
def _get_x(self):
return self._x
def _set_x(self, x):
self._x = x
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
x = property(_get_x,
lambda self, x: self._set_x(x),
doc="The x coordinate of the CocosNode")
def _get_y(self):
return self._y
def _set_y(self, y):
self._y = y
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
y = property(_get_y,
lambda self, y: self._set_y(y),
doc="The y coordinate of the CocosNode")
def _get_position(self):
return (self._x, self._y)
def _set_position(self, pos):
self._x, self._y = pos
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
position = property(_get_position,
lambda self, p: self._set_position(p),
doc='''The (x, y) coordinates of the object.
:type: tuple[int, int]
''')
def _get_scale(self):
return self._scale
def _set_scale(self, s):
self._scale = s
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
scale = property(_get_scale,
lambda self, scale: self._set_scale(scale),
doc='''The scaling factor of the object.
:type: float
''')
def _get_scale_x(self):
return self._scale_x
def _set_scale_x(self, s):
self._scale_x = s
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
scale_x = property(_get_scale_x,
lambda self, scale: self._set_scale_x(scale),
doc='''The scale x of this object.
:type: float
''')
def _get_scale_y(self):
return self._scale_y
def _set_scale_y(self, s):
self._scale_y = s
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
scale_y = property(_get_scale_y,
lambda self, scale: self._set_scale_y(scale),
doc='''The scale y of this object.
:type: float
''')
def _get_rotation(self):
return self._rotation
def _set_rotation(self, a):
self._rotation = a
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
rotation = property(_get_rotation,
lambda self, angle: self._set_rotation(angle),
doc='''The rotation of this object in degrees.
Defaults to 0.0.
:type: float
''')
def add(self, child, z=0, name=None):
"""Adds a child and if it becomes part of the active scene, it calls
its :meth:`on_enter` method.
Arguments:
child (CocosNode):
object to be added
z (Optional[float]):
the child z index. Defaults to 0.
name (Optional[str]):
Name of the child. Defaults to ``None``
Returns:
CocosNode: self
"""
# child must be a subclass of supported_classes
# if not isinstance( child, self.supported_classes ):
# raise TypeError("%s is not instance of: %s" % (type(child), self.supported_classes) )
if name:
if name in self.children_names:
raise Exception("Name already exists: %s" % name)
self.children_names[name] = child
child.parent = self
elem = z, child
# inlined and customized bisect.insort_right, the stock one fails in py3
lo = 0
hi = len(self.children)
a = self.children
while lo < hi:
mid = (lo + hi) // 2
if z < a[mid][0]:
hi = mid
else:
lo = mid + 1
self.children.insert(lo, elem)
if self.is_running:
child.on_enter()
return self
def kill(self):
"""Remove this object from its parent, and thus most likely from
everything.
"""
self.parent.remove(self)
def remove(self, obj):
"""Removes a child given its name or object
If the node was added with name, it is better to remove by name, else
the name will be unavailable for further adds (and will raise an
Exception if add with this same name is attempted)
If the node was part of the active scene, its :meth:`on_exit` method
will be called.
Arguments:
obj (str or object):
Name of the reference to be removed or object to be removed.
"""
if isinstance(obj, string_types):
if obj in self.children_names:
child = self.children_names.pop(obj)
self._remove(child)
else:
raise Exception("Child not found: %s" % obj)
else:
self._remove(obj)
def _remove(self, child):
l_old = len(self.children)
self.children = [(z, c) for (z, c) in self.children if c != child]
if l_old == len(self.children):
raise Exception("Child not found: %s" % str(child))
if self.is_running:
child.on_exit()
def get_children(self):
"""Return a list with the node's children, order is back to front.
Returns:
list[CocosNode]: children of this node, ordered back to front.
"""
return [c for (z, c) in self.children]
def __contains__(self, child):
return child in self.get_children()
def get(self, name):
"""Gets a child given its name.
Arguments:
name (str):
name of the reference to retrieve.
Returns:
CocosNode: The child named 'name'. Will raise an ``Exception`` if
not present.
Warning:
If a node is added with name, then removing it differently
than by name will prevent the name to be recycled: attempting to add
another node with this name will produce an Exception.
"""
if name in self.children_names:
return self.children_names[name]
else:
raise Exception("Child not found: %s" % name)
def on_enter(self):
"""
Called every time just before the node enters the stage.
Scheduled calls and worker actions begin or continue to perform.
Good point to do ``push_handlers()`` if you have custom ones
Note:
A handler pushed there is near certain to require a
``pop_handlers()`` in the :meth:`on_exit` method (else it will be
called even after being removed from the active scene, or if going
on stage again it will be called multiple times for each event
ocurrences).
"""
self.is_running = True
# start actions
self.resume()
# resume scheduler
self.resume_scheduler()
# propagate
for c in self.get_children():
c.on_enter()
def on_exit(self):
"""
Called every time just before the node leaves the stage.
Scheduled calls and worker actions are suspended, that is, they will not
be called until an :meth:`on_enter` event happens.
Most of the time you will want to ``pop_handlers()`` for all explicit
``push_handlers()`` found in meth:`on_enter`.
Consider to release here openGL resources created by this node, like
compiled vertex lists.
"""
self.is_running = False
# pause actions
self.pause()
# pause callbacks
self.pause_scheduler()
# propagate
for c in self.get_children():
c.on_exit()
def transform(self):
"""
Apply ModelView transformations.
You will most likely want to wrap calls to this function with
``glPushMatrix()``/``glPopMatrix()``
"""
x, y = director.get_window_size()
if not (self.grid and self.grid.active):
# only apply the camera if the grid is not active
# otherwise, the camera will be applied inside the grid
self.camera.locate()
gl.glTranslatef(self.position[0], self.position[1], 0)
gl.glTranslatef(self.transform_anchor_x, self.transform_anchor_y, 0)
if self.rotation != 0.0:
gl.glRotatef(-self._rotation, 0, 0, 1)
if self.scale != 1.0 or self.scale_x != 1.0 or self.scale_y != 1.0:
gl.glScalef(self._scale * self._scale_x,
self._scale * self._scale_y, 1)
if self.transform_anchor != (0, 0):
gl.glTranslatef(-self.transform_anchor_x, -self.transform_anchor_y,
0)
def walk(self, callback, collect=None):
"""
Executes callback on all the subtree starting at self.
returns a list of all return values that are not ``None``.
Arguments:
callback (a function):
Callable that takes a :class:`CocosNode` as an argument.
collect (list):
List of non-`None` returned values from visited nodes.
Returns:
list: The list of non-`None` return values.
"""
if collect is None:
collect = []
r = callback(self)
if r is not None:
collect.append(r)
for node in self.get_children():
node.walk(callback, collect)
return collect
def visit(self):
"""
This function *visits* its children in a recursive
way.
It will first *visit* the children that
that have a z-order value less than 0.
Then it will call the :meth:`draw` method to
draw itself.
And finally it will *visit* the rest of the
children (the ones with a z-value bigger
or equal than 0)
Before *visiting* any children it will call
the :meth:`transform` method to apply any possible
transformations.
"""
if not self.visible:
return
position = 0
if self.grid and self.grid.active:
self.grid.before_draw()
# we visit all nodes that should be drawn before ourselves
if self.children and self.children[0][0] < 0:
gl.glPushMatrix()
self.transform()
for z, c in self.children:
if z >= 0:
break
position += 1
c.visit()
gl.glPopMatrix()
# we draw ourselves
self.draw()
# we visit all the remaining nodes, that are over ourselves
if position < len(self.children):
gl.glPushMatrix()
self.transform()
for z, c in self.children[position:]:
c.visit()
gl.glPopMatrix()
if self.grid and self.grid.active:
self.grid.after_draw(self.camera)
def draw(self, *args, **kwargs):
"""
This is the function you will have to override if you want your
subclassed :class:`CocosNode` to draw something on screen.
You *must* respect the position, scale, rotation and anchor attributes.
If you want OpenGL to do the scaling for you, you can::
def draw(self):
glPushMatrix()
self.transform()
# ... draw ..
glPopMatrix()
"""
pass
def do(self, action, target=None):
"""Executes an :class:`.Action`.
When the action is finished, it will be removed from the node's actions
container.
To remove an action you must use the :meth:`do` return value to
call :meth:`remove_action`.
Arguments:
action (Action):
Action that will be executed.
Returns:
Action: A clone of ``action``
"""
a = copy.deepcopy(action)
if target is None:
a.target = self
else:
a.target = target
a.start()
self.actions.append(a)
if not self.scheduled:
if self.is_running:
self.scheduled = True
pyglet.clock.schedule(self._step)
return a
def remove_action(self, action):
"""Removes an action from the node actions container, potentially
calling ``action.stop()``.
If action was running, :meth:`.Action.stop` is called.
Mandatory interface to remove actions in the node actions container.
When skipping this there is the posibility to double call the
``action.stop``
Arguments:
action (Action):
Action to be removed.
Must be the return value for a :meth:`do` call
"""
assert action in self.actions
if not action.scheduled_to_remove:
action.scheduled_to_remove = True
action.stop()
action.target = None
self.to_remove.append(action)
def pause(self):
"""
Suspends the execution of actions.
"""
if not self.scheduled:
return
self.scheduled = False
pyglet.clock.unschedule(self._step)
def resume(self):
"""
Resumes the execution of actions.
"""
if self.scheduled:
return
self.scheduled = True
pyglet.clock.schedule(self._step)
self.skip_frame = True
def stop(self):
"""
Removes all actions from the running action list.
For each action running, the stop method will be called,
and the action will be removed from the actions container.
"""
for action in self.actions:
self.remove_action(action)
def are_actions_running(self):
"""
Determine whether any actions are running.
"""
return bool(set(self.actions) - set(self.to_remove))
def _step(self, dt):
"""pumps all the actions in the node actions container
The actions scheduled to be removed are removed.
Then a :meth:`.Action.step` is called for each action in the
node actions container, and if the action doesn't need any more step
calls, it will be scheduled to be removed. When scheduled to be
removed, the :meth:`.Action.stop` method for the action is called.
Arguments:
dt (float):
The time in seconds that elapsed since that last time this
function was called.
"""
for x in self.to_remove:
if x in self.actions:
self.actions.remove(x)
self.to_remove = []
if self.skip_frame:
self.skip_frame = False
return
if len(self.actions) == 0:
self.scheduled = False
pyglet.clock.unschedule(self._step)
for action in self.actions:
if not action.scheduled_to_remove:
action.step(dt)
if action.done():
self.remove_action(action)
# world to local / local to world methods
def get_local_transform(self):
"""Returns an :class:`.euclid.Matrix3` with the local transformation matrix
Returns:
euclid.Matrix3
"""
if self.is_transform_dirty:
matrix = euclid.Matrix3().identity()
matrix.translate(self._x, self._y)
matrix.translate(self.transform_anchor_x, self.transform_anchor_y)
matrix.rotate(math.radians(-self.rotation))
matrix.scale(self._scale * self._scale_x,
self._scale * self._scale_y)
matrix.translate(-self.transform_anchor_x,
-self.transform_anchor_y)
self.is_transform_dirty = False
self.transform_matrix = matrix
return self.transform_matrix
def get_world_transform(self):
"""Returns an :class:`.euclid.Matrix3` with the world transformation matrix
Returns:
euclid.Matrix3
"""
matrix = self.get_local_transform()
p = self.parent
while p is not None:
matrix = p.get_local_transform() * matrix
p = p.parent
return matrix
def point_to_world(self, p):
"""Returns an :class:`.euclid.Vector2` converted to world space.
Arguments:
p (Vector2): Vector to convert
Returns:
Vector2: ``p`` vector converted to world coordinates.
"""
v = euclid.Point2(p[0], p[1])
matrix = self.get_world_transform()
return matrix * v
def get_local_inverse(self):
"""Returns an :class:`.euclid.Matrix3` with the local inverse
transformation matrix.
Returns:
euclid.Matrix3
"""
if self.is_inverse_transform_dirty:
matrix = self.get_local_transform().inverse()
self.inverse_transform_matrix = matrix
self.is_inverse_transform_dirty = False
return self.inverse_transform_matrix
def get_world_inverse(self):
"""returns an :class:`.euclid.Matrix3` with the world inverse
transformation matrix.
Returns:
euclid.Matrix3
"""
matrix = self.get_local_inverse()
p = self.parent
while p is not None:
matrix = matrix * p.get_local_inverse()
p = p.parent
return matrix
def point_to_local(self, p):
"""returns an :class:`.euclid.Vector2` converted to local space.
Arguments:
p (Vector2): Vector to convert.
Returns:
Vector2: ``p`` vector converted to local coordinates.
"""
v = euclid.Point2(p[0], p[1])
matrix = self.get_world_inverse()
return matrix * v
class CocosNode(object):
"""
Cocosnode is the main element. Anything that gets drawn or contains things
that gets drawn is a :class:`CocosNode`.
The most popular :class:`CocosNode` are :class:`cocos.scene.Scene`,
:class:`cocos.layer.base_layers.Layer` and :class:`cocos.sprite.Sprite`.
The main features of a :class:`CocosNode` are:
- They can contain other :class:`CocosNode` (:meth:`add`, :meth:`get`,
:meth:`remove`, etc)
- They can schedule periodic callback (:meth:`schedule`,
:meth:`schedule_interval`, etc)
- They can execute actions (:meth:`do`, :meth:`pause`, :meth:`stop`,
etc)
Some :class:`CocosNode` provide extra functionality for them or their
children.
Subclassing a :class:`CocosNode` usually means (one/all) of:
- overriding ``__init__`` to initialize resources and schedule callbacks
- create callbacks to handle the advancement of time
- overriding :meth:`draw` to render the node
"""
def __init__(self):
# composition stuff
#: list of (int, child-reference) where int is the z-order, sorted by ascending z (back to front order)
self.children = []
#: dictionary that maps children names with children references
self.children_names = {}
self._parent = None
# drawing stuff
#: x-position of the object relative to its parent's children_anchor_x value.
#: Default: 0
self._x = 0
#: y-position of the object relative to its parent's children_anchor_y value.
#: Default: 0
self._y = 0
#: a float, alters the scale of this node and its children.
#: Default: 1.0
self._scale = 1.0
#: a float, alters the horizontal scale of this node and its children.
#: total scale along x axis is _scale_x * _scale
#: Default: 1.0
self._scale_x = 1.0
#: a float, alters the vertical scale of this node and its children.
#: total scale along y axis is _scale_y * _scale
#: Default: 1.0
self._scale_y = 1.0
#: a float, in degrees, alters the rotation of this node and its children.
#: Default: 0.0
self._rotation = 0.0
#: eye, center and up vector for the :class:`.Camera`.
#: gluLookAt() is used with these values.
#: Default: FOV 60, center of the screen.
#:
#: .. NOTE::
#: The camera can perform exactly the same
#: transformation as ``scale``, ``rotation`` and the
#: ``x``, ``y`` attributes (with the exception that the
#: camera can modify also the z-coordinate)
#: In fact, they all transform the same matrix, so
#: use either the camera or the other attributes, but not both
#: since the camera will be overridden by the transformations done
#: by the other attributes.
#:
#: You can change the camera manually or by using the
#: :class:`.Camera3DAction` action.
self.camera = Camera()
#: offset from (x,0) from where rotation and scale will be applied.
#: Default: 0
self.transform_anchor_x = 0
#: offset from (0,y) from where rotation and scale will be applied.
#: Default: 0
self.transform_anchor_y = 0
#: whether of not the object and his childrens are visible.
#: Default: True
self.visible = True
#: the grid object for the grid actions.
#: This can be a `Grid3D` or a `TiledGrid3D` object depending
#: on the action.
self.grid = None
# actions stuff
#: list of `Action` objects that are running
self.actions = []
#: list of `Action` objects to be removed
self.to_remove = []
#: whether or not the next frame will be skipped
self.skip_frame = False
# schedule stuff
self.scheduled = False # deprecated, soon to be removed
self.scheduled_calls = [] #: list of scheduled callbacks
self.scheduled_interval_calls = [] #: list of scheduled interval callbacks
self.is_running = False #: whether of not the object is running
# matrix stuff
self.is_transform_dirty = False
self.transform_matrix = euclid.Matrix3().identity()
self.is_inverse_transform_dirty = False
self.inverse_transform_matrix = euclid.Matrix3().identity()
def make_property(attr):
types = {'anchor_x': "int", 'anchor_y': "int", "anchor": "(int, int)"}
def set_attr():
def inner(self, value):
setattr(self, "transform_" + attr, value)
return inner
def get_attr():
def inner(self):
return getattr(self, "transform_" + attr)
return inner
return property(
get_attr(),
set_attr(),
doc="""a property to get fast access to transform_%s
:type: %s""" % (attr, types[attr]))
#: Anchor point of the object. Alias for :class:`transform_anchor`
#: Children will be added at this point
#: and transformations like scaling and rotation will use this point
#: as the center.
anchor = make_property("anchor")
#: Anchor x value for transformations and adding children. Alias for
#: :class:`transform_anchor_x`
anchor_x = make_property("anchor_x")
#: Anchor y value for transformations and adding children. Alias for
#: :class:`transform_anchor_y`
anchor_y = make_property("anchor_y")
def make_property(attr):
def set_attr():
def inner(self, value):
setattr(self, attr + "_x", value[0])
setattr(self, attr + "_y", value[1])
return inner
def get_attr(self):
return getattr(self, attr + "_x"), getattr(self, attr + "_y")
return property(
get_attr,
set_attr(),
doc='''a property to get fast access to "+attr+"_[x|y]
:type: (int, int)
''')
#: Transformation anchor point. Children will be added at this point and
#: transformations like scaling and rotation
#: will use this point as its center.
transform_anchor = make_property("transform_anchor")
del make_property
def schedule_interval(self, callback, interval, *args, **kwargs):
"""
Schedule a function to be called every ``interval`` seconds.
Specifying an interval of 0 prevents the function from being
called again (see :meth:`schedule` to call a function as often as
possible).
The callback function prototype is the same as for :meth:`schedule`.
This function is a wrapper to ``pyglet.clock.schedule_interval``.
It has the additional benefit that all calllbacks are paused and
resumed when the node leaves or enters a scene.
You should not have to schedule things using pyglet by yourself.
Arguments:
callback (a function):
The function to call when the timer elapsed.
interval (float):
The number of seconds to wait between each call.
*args: Variable length argument list passed to the ``callback``.
**kwargs: Arbitrary keyword arguments passed to the ``callback``.
"""
if self.is_running:
pyglet.clock.schedule_interval(callback, interval, *args, **kwargs)
self.scheduled_interval_calls.append(
(callback, interval, args, kwargs)
)
def schedule(self, callback, *args, **kwargs):
"""
Schedule a function to be called every frame.
The function should have a prototype that includes ``dt`` as the
first argument, which gives the elapsed time, in seconds, since the
last clock tick. Any additional arguments given to this function
are passed on to the callback::
def callback(dt, *args, **kwargs):
pass
This function is a wrapper to ``pyglet.clock.schedule``.
It has the additional benefit that all calllbacks are paused and
resumed when the node leaves or enters a scene.
You should not have to schedule things using pyglet by yourself.
Arguments:
callback (a function):
The function to call each frame.
*args: Variable length argument list passed to the ``callback``.
**kwargs: Arbitrary keyword arguments passed to the ``callback``.
"""
if self.is_running:
pyglet.clock.schedule(callback, *args, **kwargs)
self.scheduled_calls.append(
(callback, args, kwargs)
)
def unschedule(self, callback):
"""
Remove a function from the schedule.
If the function appears in the schedule more than once, all occurances
are removed. If the function was not scheduled, no error is raised.
This function is a wrapper to pyglet.clock.unschedule.
It has the additional benefit that all calllbacks are paused and
resumed when the node leaves or enters a scene.
You should not unschedule things using pyglet that where scheduled
by :meth:`schedule`/:meth:`schedule_interval`.
Arguments:
callback (a function):
The function to remove from the schedule.
"""
self.scheduled_calls = [
c for c in self.scheduled_calls if c[0] != callback
]
self.scheduled_interval_calls = [
c for c in self.scheduled_interval_calls if c[0] != callback
]
if self.is_running:
pyglet.clock.unschedule(callback)
def resume_scheduler(self):
"""
Time will continue/start passing for this node and callbacks
will be called, worker actions will be called.
"""
for c, i, a, k in self.scheduled_interval_calls:
pyglet.clock.schedule_interval(c, i, *a, **k)
for c, a, k in self.scheduled_calls:
pyglet.clock.schedule(c, *a, **k)
def pause_scheduler(self):
"""
Time will stop for this node: scheduled callbacks will
not be called, worker actions will not be called.
"""
for f in set(
[x[0] for x in self.scheduled_interval_calls] +
[x[0] for x in self.scheduled_calls]
):
pyglet.clock.unschedule(f)
for arg in self.scheduled_calls:
pyglet.clock.unschedule(arg[0])
def _get_parent(self):
if self._parent is None:
return None
else:
return self._parent()
def _set_parent(self, parent):
if parent is None:
self._parent = None
else:
self._parent = weakref.ref(parent)
parent = property(_get_parent, _set_parent, doc='''The parent of this object.
Returns:
CocosNode or None
''')
def get_ancestor(self, klass):
"""
Walks the nodes tree upwards until it finds a node of the class
``klass`` or returns None.
Returns:
CocosNode or None
"""
if isinstance(self, klass):
return self
parent = self.parent
if parent:
return parent.get_ancestor(klass)
#
# Transform properties
#
def _get_x(self):
return self._x
def _set_x(self, x):
self._x = x
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
x = property(_get_x, lambda self, x: self._set_x(x), doc="The x coordinate of the CocosNode")
def _get_y(self):
return self._y
def _set_y(self, y):
self._y = y
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
y = property(_get_y, lambda self, y: self._set_y(y), doc="The y coordinate of the CocosNode")
def _get_position(self):
return (self._x, self._y)
def _set_position(self, pos):
self._x, self._y = pos
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
position = property(_get_position, lambda self, p: self._set_position(p),
doc='''The (x, y) coordinates of the object.
:type: tuple[int, int]
''')
def _get_scale(self):
return self._scale
def _set_scale(self, s):
self._scale = s
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
scale = property(_get_scale, lambda self, scale: self._set_scale(scale),
doc='''The scaling factor of the object.
:type: float
''')
def _get_scale_x(self):
return self._scale_x
def _set_scale_x(self, s):
self._scale_x = s
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
scale_x = property(_get_scale_x, lambda self, scale: self._set_scale_x(scale),
doc='''The scale x of this object.
:type: float
''')
def _get_scale_y(self):
return self._scale_y
def _set_scale_y(self, s):
self._scale_y = s
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
scale_y = property(_get_scale_y, lambda self, scale: self._set_scale_y(scale),
doc='''The scale y of this object.
:type: float
''')
def _get_rotation(self):
return self._rotation
def _set_rotation(self, a):
self._rotation = a
self.is_transform_dirty = True
self.is_inverse_transform_dirty = True
rotation = property(_get_rotation, lambda self, angle: self._set_rotation(angle),
doc='''The rotation of this object in degrees.
Defaults to 0.0.
:type: float
''')
def add(self, child, z=0, name=None):
"""Adds a child and if it becomes part of the active scene, it calls
its :meth:`on_enter` method.
Arguments:
child (CocosNode):
object to be added
z (Optional[float]):
the child z index. Defaults to 0.
name (Optional[str]):
Name of the child. Defaults to ``None``
Returns:
CocosNode: self
"""
# child must be a subclass of supported_classes
# if not isinstance( child, self.supported_classes ):
# raise TypeError("%s is not instance of: %s" % (type(child), self.supported_classes) )
if name:
if name in self.children_names:
raise Exception("Name already exists: %s" % name)
self.children_names[name] = child
child.parent = self
elem = z, child
# inlined and customized bisect.insort_right, the stock one fails in py3
lo = 0
hi = len(self.children)
a = self.children
while lo < hi:
mid = (lo+hi) // 2
if z < a[mid][0]:
hi = mid
else:
lo = mid + 1
self.children.insert(lo, elem)
if self.is_running:
child.on_enter()
return self
def kill(self):
"""Remove this object from its parent, and thus most likely from
everything.
"""
self.parent.remove(self)
def remove(self, obj):
"""Removes a child given its name or object
If the node was added with name, it is better to remove by name, else
the name will be unavailable for further adds (and will raise an
Exception if add with this same name is attempted)
If the node was part of the active scene, its :meth:`on_exit` method
will be called.
Arguments:
obj (str or object):
Name of the reference to be removed or object to be removed.
"""
if isinstance(obj, string_types):
if obj in self.children_names:
child = self.children_names.pop(obj)
self._remove(child)
else:
raise Exception("Child not found: %s" % obj)
else:
self._remove(obj)
def _remove(self, child):
l_old = len(self.children)
self.children = [(z, c) for (z, c) in self.children if c != child]
if l_old == len(self.children):
raise Exception("Child not found: %s" % str(child))
if self.is_running:
child.on_exit()
def get_children(self):
"""Return a list with the node's children, order is back to front.
Returns:
list[CocosNode]: children of this node, ordered back to front.
"""
return [c for (z, c) in self.children]
def __contains__(self, child):
return child in self.get_children()
def get(self, name):
"""Gets a child given its name.
Arguments:
name (str):
name of the reference to retrieve.
Returns:
CocosNode: The child named 'name'. Will raise an ``Exception`` if
not present.
Warning:
If a node is added with name, then removing it differently
than by name will prevent the name to be recycled: attempting to add
another node with this name will produce an Exception.
"""
if name in self.children_names:
return self.children_names[name]
else:
raise Exception("Child not found: %s" % name)
def on_enter(self):
"""
Called every time just before the node enters the stage.
Scheduled calls and worker actions begin or continue to perform.
Good point to do ``push_handlers()`` if you have custom ones
Note:
A handler pushed there is near certain to require a
``pop_handlers()`` in the :meth:`on_exit` method (else it will be
called even after being removed from the active scene, or if going
on stage again it will be called multiple times for each event
ocurrences).
"""
self.is_running = True
# start actions
self.resume()
# resume scheduler
self.resume_scheduler()
# propagate
for c in self.get_children():
c.on_enter()
def on_exit(self):
"""
Called every time just before the node leaves the stage.
Scheduled calls and worker actions are suspended, that is, they will not
be called until an :meth:`on_enter` event happens.
Most of the time you will want to ``pop_handlers()`` for all explicit
``push_handlers()`` found in meth:`on_enter`.
Consider to release here openGL resources created by this node, like
compiled vertex lists.
"""
self.is_running = False
# pause actions
self.pause()
# pause callbacks
self.pause_scheduler()
# propagate
for c in self.get_children():
c.on_exit()
def transform(self):
"""
Apply ModelView transformations.
You will most likely want to wrap calls to this function with
``glPushMatrix()``/``glPopMatrix()``
"""
x, y = director.get_window_size()
if not(self.grid and self.grid.active):
# only apply the camera if the grid is not active
# otherwise, the camera will be applied inside the grid
self.camera.locate()
gl.glTranslatef(self.position[0], self.position[1], 0)
gl.glTranslatef(self.transform_anchor_x, self.transform_anchor_y, 0)
if self.rotation != 0.0:
gl.glRotatef(-self._rotation, 0, 0, 1)
if self.scale != 1.0 or self.scale_x != 1.0 or self.scale_y != 1.0:
gl.glScalef(self._scale * self._scale_x, self._scale * self._scale_y, 1)
if self.transform_anchor != (0, 0):
gl.glTranslatef(
-self.transform_anchor_x,
-self.transform_anchor_y,
0)
def walk(self, callback, collect=None):
"""
Executes callback on all the subtree starting at self.
returns a list of all return values that are not ``None``.
Arguments:
callback (a function):
Callable that takes a :class:`CocosNode` as an argument.
collect (list):
List of non-`None` returned values from visited nodes.
Returns:
list: The list of non-`None` return values.
"""
if collect is None:
collect = []
r = callback(self)
if r is not None:
collect.append(r)
for node in self.get_children():
node.walk(callback, collect)
return collect
def visit(self):
"""
This function *visits* its children in a recursive
way.
It will first *visit* the children that
that have a z-order value less than 0.
Then it will call the :meth:`draw` method to
draw itself.
And finally it will *visit* the rest of the
children (the ones with a z-value bigger
or equal than 0)
Before *visiting* any children it will call
the :meth:`transform` method to apply any possible
transformations.
"""
if not self.visible:
return
position = 0
if self.grid and self.grid.active:
self.grid.before_draw()
# we visit all nodes that should be drawn before ourselves
if self.children and self.children[0][0] < 0:
gl.glPushMatrix()
self.transform()
for z, c in self.children:
if z >= 0:
break
position += 1
c.visit()
gl.glPopMatrix()
# we draw ourselves
self.draw()
# we visit all the remaining nodes, that are over ourselves
if position < len(self.children):
gl.glPushMatrix()
self.transform()
for z, c in self.children[position:]:
c.visit()
gl.glPopMatrix()
if self.grid and self.grid.active:
self.grid.after_draw(self.camera)
def draw(self, *args, **kwargs):
"""
This is the function you will have to override if you want your
subclassed :class:`CocosNode` to draw something on screen.
You *must* respect the position, scale, rotation and anchor attributes.
If you want OpenGL to do the scaling for you, you can::
def draw(self):
glPushMatrix()
self.transform()
# ... draw ..
glPopMatrix()
"""
pass
def do(self, action, target=None):
"""Executes an :class:`.Action`.
When the action is finished, it will be removed from the node's actions
container.
To remove an action you must use the :meth:`do` return value to
call :meth:`remove_action`.
Arguments:
action (Action):
Action that will be executed.
Returns:
Action: A clone of ``action``
"""
a = copy.deepcopy(action)
if target is None:
a.target = self
else:
a.target = target
a.start()
self.actions.append(a)
if not self.scheduled:
if self.is_running:
self.scheduled = True
pyglet.clock.schedule(self._step)
return a
def remove_action(self, action):
"""Removes an action from the node actions container, potentially
calling ``action.stop()``.
If action was running, :meth:`.Action.stop` is called.
Mandatory interface to remove actions in the node actions container.
When skipping this there is the posibility to double call the
``action.stop``
Arguments:
action (Action):
Action to be removed.
Must be the return value for a :meth:`do` call
"""
assert action in self.actions
if not action.scheduled_to_remove:
action.scheduled_to_remove = True
action.stop()
action.target = None
self.to_remove.append(action)
def pause(self):
"""
Suspends the execution of actions.
"""
if not self.scheduled:
return
self.scheduled = False
pyglet.clock.unschedule(self._step)
def resume(self):
"""
Resumes the execution of actions.
"""
if self.scheduled:
return
self.scheduled = True
pyglet.clock.schedule(self._step)
self.skip_frame = True
def stop(self):
"""
Removes all actions from the running action list.
For each action running, the stop method will be called,
and the action will be removed from the actions container.
"""
for action in self.actions:
self.remove_action(action)
def are_actions_running(self):
"""
Determine whether any actions are running.
"""
return bool(set(self.actions) - set(self.to_remove))
def _step(self, dt):
"""pumps all the actions in the node actions container
The actions scheduled to be removed are removed.
Then a :meth:`.Action.step` is called for each action in the
node actions container, and if the action doesn't need any more step
calls, it will be scheduled to be removed. When scheduled to be
removed, the :meth:`.Action.stop` method for the action is called.
Arguments:
dt (float):
The time in seconds that elapsed since that last time this
function was called.
"""
for x in self.to_remove:
if x in self.actions:
self.actions.remove(x)
self.to_remove = []
if self.skip_frame:
self.skip_frame = False
return
if len(self.actions) == 0:
self.scheduled = False
pyglet.clock.unschedule(self._step)
for action in self.actions:
if not action.scheduled_to_remove:
action.step(dt)
if action.done():
self.remove_action(action)
# world to local / local to world methods
def get_local_transform(self):
"""Returns an :class:`.euclid.Matrix3` with the local transformation matrix
Returns:
euclid.Matrix3
"""
if self.is_transform_dirty:
matrix = euclid.Matrix3().identity()
matrix.translate(self._x, self._y)
matrix.translate(self.transform_anchor_x, self.transform_anchor_y)
matrix.rotate(math.radians(-self.rotation))
matrix.scale(self._scale * self._scale_x, self._scale * self._scale_y)
matrix.translate(-self.transform_anchor_x, -self.transform_anchor_y)
self.is_transform_dirty = False
self.transform_matrix = matrix
return self.transform_matrix
def get_world_transform(self):
"""Returns an :class:`.euclid.Matrix3` with the world transformation matrix
Returns:
euclid.Matrix3
"""
matrix = self.get_local_transform()
p = self.parent
while p is not None:
matrix = p.get_local_transform() * matrix
p = p.parent
return matrix
def point_to_world(self, p):
"""Returns an :class:`.euclid.Vector2` converted to world space.
Arguments:
p (Vector2): Vector to convert
Returns:
Vector2: ``p`` vector converted to world coordinates.
"""
v = euclid.Point2(p[0], p[1])
matrix = self.get_world_transform()
return matrix * v
def get_local_inverse(self):
"""Returns an :class:`.euclid.Matrix3` with the local inverse
transformation matrix.
Returns:
euclid.Matrix3
"""
if self.is_inverse_transform_dirty:
matrix = self.get_local_transform().inverse()
self.inverse_transform_matrix = matrix
self.is_inverse_transform_dirty = False
return self.inverse_transform_matrix
def get_world_inverse(self):
"""returns an :class:`.euclid.Matrix3` with the world inverse
transformation matrix.
Returns:
euclid.Matrix3
"""
matrix = self.get_local_inverse()
p = self.parent
while p is not None:
matrix = matrix * p.get_local_inverse()
p = p.parent
return matrix
def point_to_local(self, p):
"""returns an :class:`.euclid.Vector2` converted to local space.
Arguments:
p (Vector2): Vector to convert.
Returns:
Vector2: ``p`` vector converted to local coordinates.
"""
v = euclid.Point2(p[0], p[1])
matrix = self.get_world_inverse()
return matrix * v
