143 lines
4.5 KiB
Python
143 lines
4.5 KiB
Python
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"""Animations
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Animations can be used by the :py:class:`~pyglet.sprite.Sprite` class in place
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of static images. They are essentially containers for individual image frames,
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with a duration per frame. They can be infinitely looping, or stop at the last
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frame. You can load Animations from disk, such as from GIF files::
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ani = pyglet.resource.animation('walking.gif')
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sprite = pyglet.sprite.Sprite(img=ani)
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Alternatively, you can create your own Animations from a sequence of images
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by using the :py:meth:`~Animation.from_image_sequence` method::
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images = [pyglet.resource.image('walk_a.png'),
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pyglet.resource.image('walk_b.png'),
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pyglet.resource.image('walk_c.png')]
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ani = pyglet.image.Animation.from_image_sequence(images, duration=0.1, loop=True)
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You can also use an :py:class:`pyglet.image.ImageGrid`, which is iterable::
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sprite_sheet = pyglet.resource.image('my_sprite_sheet.png')
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image_grid = pyglet.image.ImageGrid(sprite_sheet, rows=1, columns=5)
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ani = pyglet.animation.Animation.from_image_sequence(image_grid, duration=0.1)
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In the above examples, all the Animation Frames have the same duration.
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If you wish to adjust this, you can manually create the Animation from a list of
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:py:class:`~AnimationFrame`::
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image_a = pyglet.resource.image('walk_a.png')
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image_b = pyglet.resource.image('walk_b.png')
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image_c = pyglet.resource.image('walk_c.png')
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frame_a = AnimationFrame(image_a, duration=0.1)
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frame_b = AnimationFrame(image_b, duration=0.2)
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frame_c = AnimationFrame(image_c, duration=0.1)
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ani = pyglet.image.Animation(frames=[frame_a, frame_b, frame_c])
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"""
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from pyglet import clock as _clock
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from pyglet import event as _event
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class AnimationController(_event.EventDispatcher):
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_frame_index: int = 0
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_next_dt: float = 0.0
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_paused: bool = False
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_animation: 'Animation'
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def _animate(self, dt):
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"""
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Subclasses of AnimationController should provide their own
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_animate method. This method should determine
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"""
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raise NotImplementedError
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@property
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def paused(self) -> bool:
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"""Pause/resume the Animation."""
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return self._paused
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@paused.setter
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def paused(self, pause):
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if not self._animation or pause == self._paused:
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return
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if pause is True:
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_clock.unschedule(self._animate)
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else:
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frame = self._animation.frames[self._frame_index]
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self._next_dt = frame.duration
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if self._next_dt:
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_clock.schedule_once(self._animate, self._next_dt)
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self._paused = pause
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@property
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def frame_index(self) -> int:
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"""The current AnimationFrame."""
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return self._frame_index
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@frame_index.setter
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def frame_index(self, index):
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# Bound to available number of frames
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if self._animation is None:
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return
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self._frame_index = max(0, min(index, len(self._animation.frames)-1))
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AnimationController.register_event_type('on_animation_end')
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class Animation:
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"""Sequence of AnimationFrames.
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If no frames of the animation have a duration of ``None``, the animation
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loops continuously; otherwise the animation stops at the first frame with
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duration of ``None``.
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:Ivariables:
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`frames` : list of `~pyglet.animation.AnimationFrame`
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The frames that make up the animation.
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"""
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__slots__ = 'frames'
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def __init__(self, frames: list):
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"""Create an animation directly from a list of frames."""
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assert len(frames)
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self.frames = frames
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def get_duration(self) -> float:
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"""Get the total duration of the animation in seconds."""
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return sum([frame.duration for frame in self.frames if frame.duration is not None])
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@classmethod
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def from_sequence(cls, sequence: list, duration: float, loop: bool = True):
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"""Create an animation from a list of objects and a constant framerate."""
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frames = [AnimationFrame(image, duration) for image in sequence]
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if not loop:
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frames[-1].duration = None
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return cls(frames)
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def __repr__(self):
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return "Animation(frames={0})".format(len(self.frames))
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class AnimationFrame:
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"""A single frame of an animation."""
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__slots__ = 'data', 'duration'
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def __init__(self, data, duration):
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self.data = data
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self.duration = duration
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def __repr__(self):
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return f"AnimationFrame({self.data}, duration={self.duration})"
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