Sprite Properties#

Screen shot of using sprites to collect coins
sprite_properties.py#
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"""
Sprites with Properties Example

Simple program to show how to store properties on sprites.

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_properties
"""
import arcade

# --- Constants ---
SPRITE_SCALING_PLAYER = 0.5

SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
SCREEN_TITLE = "Sprites with Properties Example"


class MyGame(arcade.Window):
    """ Our custom Window Class"""

    def __init__(self):
        """ Initializer """
        # Call the parent class initializer
        super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)

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

        # Set up the player info
        self.player_sprite = None

        # Set up sprite that will serve as trigger
        self.trigger_sprite = None

        # Don't show the mouse cursor
        self.set_mouse_visible(False)

        arcade.set_background_color(arcade.color.AMAZON)

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

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

        # Set up the player
        # Character image from kenney.nl
        self.player_sprite = arcade.Sprite(":resources:images/animated_characters/female_person/femalePerson_idle.png",
                                           SPRITE_SCALING_PLAYER)
        self.player_sprite.center_x = 50
        self.player_sprite.center_y = 150
        self.player_list.append(self.player_sprite)

        # Create the sprites
        for x in range(100, 800, 100):
            coin = arcade.Sprite(":resources:images/items/coinGold.png", scale=0.3, center_x=x, center_y=400)
            coin.intensity = 'dim'
            coin.alpha = 64
            self.coin_list.append(coin)

        # Create trigger
        self.trigger_sprite = arcade.Sprite(":resources:images/pinball/bumper.png", scale=0.5,
                                            center_x=750, center_y=50)

    def on_draw(self):
        """ Draw everything """
        self.clear()
        self.coin_list.draw()
        self.trigger_sprite.draw()
        self.player_list.draw()

        # Put the instructions on the screen.
        instructions1 = "Touch a coin to set its intensity property to 'bright'."
        arcade.draw_text(instructions1, 10, 90, arcade.color.WHITE, 14)
        instructions2 = "Touch the trigger at the bottom-right to destroy all 'bright' sprites."
        arcade.draw_text(instructions2, 10, 70, arcade.color.WHITE, 14)

        # Query the property on the coins and show results.
        coins_are_bright = [coin.intensity == 'bright' for coin in self.coin_list]
        output_any = f"Any sprites have intensity=bright? : {any(coins_are_bright)}"
        arcade.draw_text(output_any, 10, 40, arcade.color.WHITE, 14)
        output_all = f"All sprites have intensity=bright? : {all(coins_are_bright)}"
        arcade.draw_text(output_all, 10, 20, arcade.color.WHITE, 14)

    def on_mouse_motion(self, x, y, dx, dy):
        """ Handle Mouse Motion """

        # Move the center of the player sprite to match the mouse x, y
        self.player_sprite.center_x = x
        self.player_sprite.center_y = y

    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.coin_list.update()

        # Generate a list of all sprites that collided with the player.
        coins_hit_list = arcade.check_for_collision_with_list(self.player_sprite, self.coin_list)

        # Loop through each colliding sprite to set intensity=bright
        for coin in coins_hit_list:
            coin.intensity = 'bright'
            coin.alpha = 255

        hit_trigger = arcade.check_for_collision(self.player_sprite, self.trigger_sprite)
        if hit_trigger:
            intense_sprites = [sprite for sprite in self.coin_list if sprite.intensity == 'bright']
            for coin in intense_sprites:
                coin.remove_from_sprite_lists()


def main():
    """ Main function """
    window = MyGame()
    window.setup()
    arcade.run()


if __name__ == "__main__":
    main()