Sprite: Face Left or Right
sprite_face_left_or_right.py
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Sprite Facing Left or Right
Face left or right depending on our direction
Simple program to show basic sprite usage.
Artwork from https://kenney.nl
If Python and Arcade are installed, this example can be run from the command line with:
python -m arcade.examples.sprite_face_left_or_right
"""
import arcade
SPRITE_SCALING = 0.5
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
SCREEN_TITLE = "Sprite Face Left or Right Example"
MOVEMENT_SPEED = 5
# Index of textures, first element faces left, second faces right
TEXTURE_LEFT = 0
TEXTURE_RIGHT = 1
class Player(arcade.Sprite):
def __init__(self):
super().__init__()
self.scale = SPRITE_SCALING
self.textures = []
# Load a left facing texture and a right facing texture.
# flipped_horizontally=True will mirror the image we load.
texture = arcade.load_texture(":resources:images/enemies/bee.png")
self.textures.append(texture)
texture = arcade.load_texture(":resources:images/enemies/bee.png",
flipped_horizontally=True)
self.textures.append(texture)
# By default, face right.
self.texture = texture
def update(self):
self.center_x += self.change_x
self.center_y += self.change_y
# Figure out if we should face left or right
if self.change_x < 0:
self.texture = self.textures[TEXTURE_LEFT]
elif self.change_x > 0:
self.texture = self.textures[TEXTURE_RIGHT]
class MyGame(arcade.Window):
"""
Main application class.
"""
def __init__(self, width, height, title):
"""
Initializer
"""
# Call the parent class initializer
super().__init__(width, height, title)
# Variables that will hold sprite lists
self.player_sprite_list = None
# Set up the player info
self.player_sprite = None
# Set the background color
arcade.set_background_color(arcade.color.AMAZON)
def setup(self):
""" Set up the game and initialize the variables. """
# Sprite lists
self.player_sprite_list = arcade.SpriteList()
# Set up the player
self.player_sprite = Player()
self.player_sprite.center_x = SCREEN_WIDTH / 2
self.player_sprite.center_y = SCREEN_HEIGHT / 2
self.player_sprite_list.append(self.player_sprite)
def on_draw(self):
"""
Render the screen.
"""
# This command has to happen before we start drawing
self.clear()
# Draw all the sprites.
self.player_sprite_list.draw()
def on_update(self, delta_time):
""" Movement and game logic """
# Call update on all sprites (The sprites don't do much in this
# example though.)
self.player_sprite_list.update()
def on_key_press(self, key, modifiers):
"""Called whenever a key is pressed. """
if key == arcade.key.UP:
self.player_sprite.change_y = MOVEMENT_SPEED
elif key == arcade.key.DOWN:
self.player_sprite.change_y = -MOVEMENT_SPEED
elif key == arcade.key.LEFT:
self.player_sprite.change_x = -MOVEMENT_SPEED
elif key == arcade.key.RIGHT:
self.player_sprite.change_x = MOVEMENT_SPEED
def on_key_release(self, key, modifiers):
"""Called when the user releases a key. """
if key == arcade.key.UP or key == arcade.key.DOWN:
self.player_sprite.change_y = 0
elif key == arcade.key.LEFT or key == arcade.key.RIGHT:
self.player_sprite.change_x = 0
def main():
""" Main function """
window = MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
window.setup()
arcade.run()
if __name__ == "__main__":
main()
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