ripple.py 文件源码

def draw(self, layer, timestamp):
        """
        Draw the next layer
        """

        # Yield until the queue becomes active
        events = await self.get_input_events()

        if len(events) > 0:
            self._process_events(events)

            # paint circles in descending timestamp order (oldest first)
            events = sorted(events, key=operator.itemgetter(0), reverse=True)

            for event in events:
                distance = 1.0 - event.percent_complete
                if distance < 1.0:
                    radius = self._max_distance * distance

                    self._draw_circles(layer, radius, event)

            return True

        return False