Move By Keyboard

Screen shot of moving a sprite by keyboard
sprite_move_keyboard.py
  1"""
  2Move Sprite With Keyboard
  3
  4Simple program to show moving a sprite with the keyboard.
  5The sprite_move_keyboard_better.py example is slightly better
  6in how it works, but also slightly more complex.
  7
  8Artwork from https://kenney.nl
  9
 10If Python and Arcade are installed, this example can be run from the command line with:
 11python -m arcade.examples.sprite_move_keyboard
 12"""
 13
 14import arcade
 15
 16SPRITE_SCALING = 0.5
 17
 18SCREEN_WIDTH = 800
 19SCREEN_HEIGHT = 600
 20SCREEN_TITLE = "Move Sprite with Keyboard Example"
 21
 22MOVEMENT_SPEED = 5
 23
 24
 25class Player(arcade.Sprite):
 26    """ Player Class """
 27
 28    def update(self):
 29        """ Move the player """
 30        # Move player.
 31        # Remove these lines if physics engine is moving player.
 32        self.center_x += self.change_x
 33        self.center_y += self.change_y
 34
 35        # Check for out-of-bounds
 36        if self.left < 0:
 37            self.left = 0
 38        elif self.right > SCREEN_WIDTH - 1:
 39            self.right = SCREEN_WIDTH - 1
 40
 41        if self.bottom < 0:
 42            self.bottom = 0
 43        elif self.top > SCREEN_HEIGHT - 1:
 44            self.top = SCREEN_HEIGHT - 1
 45
 46
 47class MyGame(arcade.Window):
 48    """
 49    Main application class.
 50    """
 51
 52    def __init__(self, width, height, title):
 53        """
 54        Initializer
 55        """
 56
 57        # Call the parent class initializer
 58        super().__init__(width, height, title)
 59
 60        # Variables that will hold sprite lists
 61        self.player_list = None
 62
 63        # Set up the player info
 64        self.player_sprite = None
 65
 66        # Set the background color
 67        self.background_color = arcade.color.AMAZON
 68
 69    def setup(self):
 70        """ Set up the game and initialize the variables. """
 71
 72        # Sprite lists
 73        self.player_list = arcade.SpriteList()
 74
 75        # Set up the player
 76        self.player_sprite = Player(
 77            ":resources:images/animated_characters/female_person/femalePerson_idle.png",
 78            scale=SPRITE_SCALING,
 79        )
 80        self.player_sprite.center_x = 50
 81        self.player_sprite.center_y = 50
 82        self.player_list.append(self.player_sprite)
 83
 84    def on_draw(self):
 85        """
 86        Render the screen.
 87        """
 88
 89        # This command has to happen before we start drawing
 90        self.clear()
 91
 92        # Draw all the sprites.
 93        self.player_list.draw()
 94
 95    def on_update(self, delta_time):
 96        """ Movement and game logic """
 97
 98        # Move the player
 99        self.player_list.update()
100
101    def on_key_press(self, key, modifiers):
102        """Called whenever a key is pressed. """
103
104        # If the player presses a key, update the speed
105        if key == arcade.key.UP:
106            self.player_sprite.change_y = MOVEMENT_SPEED
107        elif key == arcade.key.DOWN:
108            self.player_sprite.change_y = -MOVEMENT_SPEED
109        elif key == arcade.key.LEFT:
110            self.player_sprite.change_x = -MOVEMENT_SPEED
111        elif key == arcade.key.RIGHT:
112            self.player_sprite.change_x = MOVEMENT_SPEED
113
114    def on_key_release(self, key, modifiers):
115        """Called when the user releases a key. """
116
117        # If a player releases a key, zero out the speed.
118        # This doesn't work well if multiple keys are pressed.
119        # Use 'better move by keyboard' example if you need to
120        # handle this.
121        if key == arcade.key.UP or key == arcade.key.DOWN:
122            self.player_sprite.change_y = 0
123        elif key == arcade.key.LEFT or key == arcade.key.RIGHT:
124            self.player_sprite.change_x = 0
125
126
127def main():
128    """ Main function """
129    window = MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
130    window.setup()
131    arcade.run()
132
133
134if __name__ == "__main__":
135    main()