commit cfa10d53647322ff9989db258cfbd42e98b8f8d4 · cduck.me/drawsvg

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README.md

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       ![Example output image](https://raw.githubusercontent.com/cduck/drawSvg/master/examples/example6.gif)

     

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       ![Example output image](https://raw.githubusercontent.com/cduck/drawSvg/master/examples/example6.gif)

     

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       ### Asynchronous Animation in Jupyter

     

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       ```python

     

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       # Jupyter cell 1:

     

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       widget = AsyncAnimation(fps=10)

     

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       widget

     

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       # [Animation is displayed here (click to pause)]

     

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       # Jupyter cell 2:

     

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       global_variable = 'a'

     

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       @widget.set_draw_frame  # Animation above is automatically updated

     

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       def draw_frame(secs=0):

     

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           # Draw something...

     

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           d = draw.Drawing(300, 40)

     

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           d.append(draw.Text(global_variable, 20, 0, 10))

     

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           d.append(draw.Text(str(secs), 20, 30, 10))

     

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           return d

     

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       # Jupyter cell 3:

     

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       global_variable = 'b'  # Animation above now displays 'b'

     

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       ```

drawSvg/widgets/__init__.py

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       from .drawing_widget import DrawingWidget

     

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       from .drawing_widget import DrawingWidget

     

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       from .async_animation import AsyncAnimation

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drawSvg/widgets/async_animation.py

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       import time

     

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       from ..drawing import Drawing

     

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       from .drawing_widget import DrawingWidget

     

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       class AsyncAnimation(DrawingWidget):

     

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           '''AsyncAnimation is a Jupyter notebook widget for asynchronously displaying

     

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           an animation.

     

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           Example:

     

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               # Jupyter cell 1:

     

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               widget = AsyncAnimation(fps=10)

     

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               widget

     

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               # [Animation is displayed here]

     

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               # Jupyter cell 2:

     

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               global_variable = 'a'

     

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               @widget.set_draw_frame  # Animation above is automatically updated

     

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               def draw_frame(secs=0):

     

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                   # Draw something...

     

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                   d = draw.Drawing(300, 40)

     

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                   d.append(draw.Text(global_variable, 20, 0, 10))

     

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                   d.append(draw.Text(str(secs), 20, 30, 10))

     

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                   return d

     

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               # Jupyter cell 3:

     

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               global_variable = 'b'  # Animation above now displays 'b'

     

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           Attributes:

     

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               fps: The animation frame rate (frames per second).

     

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               draw_frame: A function that takes a single argument (animation time) and

     

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                   returns a Drawing.

     

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               paused: While True, the animation will not run.  Only the current frame

     

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                   will be shown.

     

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               disable: While True, the widget will not be interactive and the

     

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                   animation will not update.

     

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               click_pause: If True, clicking the drawing will pause or resume the

     

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                   animation.

     

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               mousemove_pause: If True, moving the mouse up across the drawing will

     

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                   pause the animation and moving the mouse down will resume it.

     

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               mousemove_y_threshold: Controls the sensitivity of mousemove_pause in

     

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                   web browser pixels.

     

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           '''

     

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           def __init__(self, fps=10, draw_frame=None, *, paused=False, disable=False,

     

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                        click_pause=True, mousemove_pause=False,

     

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                        mousemove_y_threshold=10):

     

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               self._fps = fps

     

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               self._paused = paused

     

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               if draw_frame is None:

     

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                   def draw_frame(secs):

     

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                       return Drawing(0, 0)

     

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               self._draw_frame = draw_frame

     

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               self._last_secs = 0

     

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               self.click_pause = click_pause

     

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               self.mousemove_pause = mousemove_pause

     

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               self.mousemove_y_threshold = mousemove_y_threshold

     

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               self._start_time = 0

     

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               self._stop_time = 0

     

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               self._y_loc = 0

     

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               self._y_max = 0

     

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               self._y_min = 0

     

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               if self._paused:

     

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                   frame_delay = -1

     

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               else:

     

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                   frame_delay = 1000 // self._fps

     

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                   self._start_time = time.monotonic()

     

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               initial_drawing = self.draw_frame(0)

     

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               super().__init__(initial_drawing, throttle=True, disable=disable,

     

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                                frame_delay=frame_delay)

     

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               # Register callbacks

     

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               @self.mousedown

     

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               def mousedown(self, x, y, info):

     

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                   if not self.click_pause:

     

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                       return

     

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                   self._y_min = self._y_max = self._y_loc

     

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                   self.paused = not self.paused

     

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               @self.mousemove

     

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               def mousemove(self, x, y, info):

     

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                   self._y_loc += info['movementY']

     

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                   if not self.mousemove_pause:

     

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                       self._y_min = self._y_max = self._y_loc

     

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                       return

     

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                   self._y_max = max(self._y_max, self._y_loc)

     

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                   self._y_min = min(self._y_min, self._y_loc)

     

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                   thresh = self.mousemove_y_threshold

     

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                   invert = thresh < 0

     

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                   thresh = max(0.01, abs(thresh))

     

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                   down_triggered = self._y_loc - self._y_min >= thresh

     

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                   up_triggered = self._y_max - self._y_loc >= thresh

     

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                   if down_triggered:

     

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                       self._y_min = self._y_loc

     

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                   if up_triggered:

     

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                       self._y_max = self._y_loc

     

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                   if invert:

     

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                       down_triggered, up_triggered = up_triggered, down_triggered

     

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                   if down_triggered:

     

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                       self.paused = False

     

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                   if up_triggered:

     

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                       self.paused = True

     

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               @self.timed

     

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               def timed(self, info):

     

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                   secs = time.monotonic() - self._start_time

     

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                   self.drawing = self.draw_frame(secs)

     

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                   self._last_secs = secs

     

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               @self.on_exception

     

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               def on_exception(self, e):

     

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                   self.paused = True

     

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           @property

     

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           def fps(self):

     

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               return self._fps

     

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           @fps.setter

     

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           def fps(self, new_fps):

     

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               self._fps = new_fps

     

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               if self.paused:

     

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                   return

     

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               self.frame_delay = 1000 // self._fps

     

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           @property

     

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           def paused(self):

     

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               return self._paused

     

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           @paused.setter

     

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           def paused(self, new_paused):

     

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               if bool(self._paused) == bool(new_paused):

     

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                   return

     

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               self._paused = new_paused

     

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               if self._paused:

     

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                   self.frame_delay = -1

     

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                   self._stop_time = time.monotonic()

     

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               else:

     

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                   self._start_time += time.monotonic() - self._stop_time

     

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                   self.frame_delay = 1000 // self._fps

     

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           @property

     

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           def draw_frame(self):

     

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               return self._draw_frame

     

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           @draw_frame.setter

     

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           def draw_frame(self, new_draw_frame):

     

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               self._draw_frame = new_draw_frame

     

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               if self.paused:

     

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                   # Redraw if paused

     

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                   self.drawing = self._draw_frame(self._last_secs)

     

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           def set_draw_frame(self, new_draw_frame):

     

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               self.draw_frame = new_draw_frame

     

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               return new_draw_frame

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drawSvg/widgets/drawing_widget.py

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               self.mousemove_callbacks = []

     

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               self.mouseup_callbacks = []

     

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               self.timed_callbacks = []

     

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               self.on_msg(self._receive_msg)

     

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                       else:

     

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                           self._call_handlers(callbacks, content.get('x'),

     

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                                               content.get('y'), content)

     

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               finally:

     

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                   if name == 'timed':

     

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                       self._frame_blocked += 1

     
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               '''

     

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               self._register_handler(

     

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                   self.timed_callbacks, handler, remove=remove)

     

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           def _register_handler(self, callback_list, handler, remove=False):

     

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               if remove:

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               self.mousemove_callbacks = []

     

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               self.mouseup_callbacks = []

     

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               self.timed_callbacks = []

     

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               self.exception_callbacks = []

     

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               self.on_msg(self._receive_msg)

     

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                       else:

     

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                           self._call_handlers(callbacks, content.get('x'),

     

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                                               content.get('y'), content)

     

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               except BaseException as e:

     

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                   suppress = any(

     

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                       handler(self, e)

     

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                       for handler in self.exception_callbacks

     

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                   )

     

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                   if not suppress:

     

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                       raise

     

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               finally:

     

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                   if name == 'timed':

     

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                       self._frame_blocked += 1

     
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               '''

     

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               self._register_handler(

     

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                   self.timed_callbacks, handler, remove=remove)

     

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           def on_exception(self, handler, remove=False):

     

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               '''

     

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               Register (or unregister) a handler for exceptions in other handlers.

     

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               If any handler returns True, the exception is suppressed.

     

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               Arguments:

     

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                   remove: If True, unregister, otherwise register.

     

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               '''

     

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               self._register_handler(

     

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                   self.exception_callbacks, handler, remove=remove)

     

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           def _register_handler(self, callback_list, handler, remove=False):

     

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               if remove: