def update(self, delta_time):
""" Update the sprites """
# Keep track of how long this function takes.
start_time = timeit.default_timer()
# If we have force to apply to the player (from hitting the arrow
# keys), apply it.
self.player.body.apply_force_at_local_point(self.force, (0, 0))
# check_collision(self.player)
# See if the player is standing on an item.
# If she is, apply opposite force to the item below her.
# So if she moves left, the box below her will have
# a force to move to the right.
grounding = check_grounding(self.player)
if self.force[0] and grounding and grounding['body']:
grounding['body'].apply_force_at_world_point((-self.force[0], 0),
grounding['position'])
# Check for sprites that fall off the screen.
# If so, get rid of them.
for sprite in self.dynamic_sprite_list:
if sprite.shape.body.position.y < 0:
# Remove sprites from physics space
self.space.remove(sprite.shape, sprite.shape.body)
# Remove sprites from physics list
sprite.kill()
# Update physics
# Use a constant time step, don't use delta_time
# See "Game loop / moving time forward"
# http://www.pymunk.org/en/latest/overview.html#game-loop-moving-time-forward
self.space.step(1 / 60.0)
# If we are dragging an object, make sure it stays with the mouse. Otherwise
# gravity will drag it down.
if self.shape_being_dragged is not None:
self.shape_being_dragged.shape.body.position = self.last_mouse_position
self.shape_being_dragged.shape.body.velocity = 0, 0
# Resync the sprites to the physics objects that shadow them
resync_physics_sprites(self.dynamic_sprite_list)
# Scroll the viewport if needed
self.scroll_viewport()
# Save the time it took to do this.
self.processing_time = timeit.default_timer() - start_time
def on_key_press(self, symbol: int, modifiers: int):
""" Handle keyboard presses. """
if symbol == arcade.key.RIGHT:
# Add force to the player, and set the player friction to zero
self.force = (PLAYER_MOVE_FORCE, 0)
self.player.shape.friction = 0
elif symbol == arcade.key.LEFT:
# Add force to the player, and set the player friction to zero
self.force = (-PLAYER_MOVE_FORCE, 0)
self.player.shape.friction = 0
elif symbol == arcade.key.UP:
# find out if player is standing on ground
grounding = check_grounding(self.player)
if grounding['body'] != None and abs(grounding['normal'].x / grounding['normal'].y) < self.player.shape.friction:
# She is! Go ahead and jump
self.player.body.apply_impulse_at_local_point((0, PLAYER_JUMP_IMPULSE))
elif symbol == arcade.key.SPACE:
self.punch()
elif symbol == arcade.key.G:
self.grab()
