def _prepare(self):
if not self.visual_backend and not self.store_positions:
functions.warn(
"No results are logged. Ensure you want a headless simulation."
)
# The order in which the following effects are added is important.
for population in self.populations:
self.on_step_functions.append(population.step)
if 'repulsion' in self.effects:
self.on_step_functions.append(self.effects['repulsion'].step)
if 'fire' in self.effects:
self.on_step_functions.append(self.effects['fire'].step)
self.on_step_functions.append(self.scene.move)
if 'separation' in self.effects:
self.on_step_functions.append(self.effects['separation'].step)
self.on_step_functions.append(self.scene.correct_for_geometry)
self.on_step_functions.append(self.scene.find_finished)
if self.store_positions:
self.on_step_functions.append(self.logger.step)
if self.visual_backend:
self.vis = VisualScene(self.scene)
self.on_step_functions.append(self.vis.loop)
else:
self.vis = NoVisualScene(self.scene)
if self.inflow:
self.on_step_functions.append(self._add_new_pedestrian_sometimes)
self.vis.step_callback = self.step
self.vis.finish_callback = self.finish
self.scene.on_pedestrian_exit_functions.append(self._check_percentage)
if self.params.max_time > 0:
self.scene.on_pedestrian_exit_functions.append(
self._check_max_time)
