Move Sprites By Angle

sprite_move_angle.py
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import arcade
import os
import math

SPRITE_SCALING = 0.5

SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600

MOVEMENT_SPEED = 5
ANGLE_SPEED = 5


class Player(arcade.Sprite):
    """ Player class """

    def __init__(self, image, scale):
        """ Set up the player """

        # Call the parent init
        super().__init__(image, scale)

        # Create a variable to hold our speed. 'angle' is created by the parent
        self.speed = 0

    def update(self):
        # Convert angle in degrees to radians.
        angle_rad = math.radians(self.angle)

        # Rotate the ship
        self.angle += self.change_angle

        # Use math to find our change based on our speed and angle
        self.center_x += -self.speed * math.sin(angle_rad)
        self.center_y += self.speed * math.cos(angle_rad)


class MyGame(arcade.Window):
    """
    Main application class.
    """

    def __init__(self, width, height):
        """
        Initializer
        """

        # Call the parent class initializer
        super().__init__(width, height)

        # Set the working directory (where we expect to find files) to the same
        # directory this .py file is in. You can leave this out of your own
        # code, but it is needed to easily run the examples using "python -m"
        # as mentioned at the top of this program.
        file_path = os.path.dirname(os.path.abspath(__file__))
        os.chdir(file_path)

        # Variables that will hold sprite lists
        self.player_list = None

        # Set up the player info
        self.player_sprite = None
        self.score = 0

        # Set the background color
        arcade.set_background_color(arcade.color.BLACK)

    def setup(self):
        """ Set up the game and initialize the variables. """

        # Sprite lists
        self.player_list = arcade.SpriteList()

        # Set up the player
        self.score = 0
        self.player_sprite = Player("images/playerShip1_orange.png", SPRITE_SCALING)
        self.player_sprite.center_x = SCREEN_WIDTH / 2
        self.player_sprite.center_y = SCREEN_HEIGHT / 2
        self.player_list.append(self.player_sprite)

    def on_draw(self):
        """
        Render the screen.
        """

        # This command has to happen before we start drawing
        arcade.start_render()

        # Draw all the sprites.
        self.player_list.draw()

    def 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_list.update()

    def on_key_press(self, key, modifiers):
        """Called whenever a key is pressed. """

        # Forward/back
        if key == arcade.key.UP:
            self.player_sprite.speed = MOVEMENT_SPEED
        elif key == arcade.key.DOWN:
            self.player_sprite.speed = -MOVEMENT_SPEED

        # Rotate left/right
        elif key == arcade.key.LEFT:
            self.player_sprite.change_angle = ANGLE_SPEED
        elif key == arcade.key.RIGHT:
            self.player_sprite.change_angle = -ANGLE_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.speed = 0
        elif key == arcade.key.LEFT or key == arcade.key.RIGHT:
            self.player_sprite.change_angle = 0


def main():
    """ Main method """
    window = MyGame(SCREEN_WIDTH, SCREEN_HEIGHT)
    window.setup()
    arcade.run()


if __name__ == "__main__":
    main()