Collect Coins Moving Down

For a complete explanation, see Chapter 22 of Arcade Academy - Learn Python.

Screenshot of using sprites to collect coins
sprite_collect_coins_move_down.py
  1"""
  2Sprite Collect Coins Moving Down
  3
  4Simple program to show basic sprite usage.
  5
  6Artwork from https://kenney.nl
  7
  8If Python and Arcade are installed, this example can be run from the command line with:
  9python -m arcade.examples.sprite_collect_coins_move_down
 10"""
 11
 12import random
 13import arcade
 14
 15# --- Constants ---
 16SPRITE_SCALING_PLAYER = 0.5
 17SPRITE_SCALING_COIN = 0.3
 18COIN_COUNT = 50
 19
 20WINDOW_WIDTH = 1280
 21WINDOW_HEIGHT = 720
 22WINDOW_TITLE = "Sprite Collect Coins Moving Down Example"
 23
 24
 25class Coin(arcade.Sprite):
 26    """
 27    This class represents the coins on our screen. It is a child class of
 28    the Arcade library's "Sprite" class.
 29    """
 30
 31    def reset_pos(self):
 32        # Reset the coin to a random spot above the screen
 33        self.center_y = random.randrange(WINDOW_HEIGHT + 20,
 34                                         WINDOW_HEIGHT + 100)
 35        self.center_x = random.randrange(WINDOW_WIDTH)
 36
 37    def update(self, delta_time: float = 1/60):
 38        # Take frame time into account
 39        time_step = delta_time * 60
 40
 41        # Move the coin 1 pixel down per 1/60th of a second
 42        self.center_y -= 1 * time_step
 43
 44        # See if the coin has fallen off the bottom of the screen.
 45        # If so, reset it.
 46        if self.top < 0:
 47            self.reset_pos()
 48
 49
 50class GameView(arcade.View):
 51
 52    def __init__(self):
 53        """ Initializer """
 54
 55        # Call the parent class initializer
 56        super().__init__()
 57
 58        # Variables that will hold sprite lists
 59        self.player_sprite_list = None
 60        self.coin_sprite_list = None
 61
 62        # Set up the player info
 63        self.player_sprite = None
 64        self.score = 0
 65
 66        # Don't show the mouse cursor
 67        self.window.set_mouse_visible(False)
 68
 69        self.background_color = arcade.color.AMAZON
 70
 71    def setup(self):
 72        """ Set up the game and initialize the variables. """
 73
 74        # Sprite lists
 75        self.player_sprite_list = arcade.SpriteList()
 76        self.coin_sprite_list = arcade.SpriteList()
 77
 78        # Score
 79        self.score = 0
 80
 81        # Set up the player
 82        # Character image from kenney.nl
 83        self.player_sprite = arcade.Sprite(
 84            ":resources:images/animated_characters/female_person/femalePerson_idle.png",
 85            scale=SPRITE_SCALING_PLAYER,
 86        )
 87        self.player_sprite.center_x = 50
 88        self.player_sprite.center_y = 50
 89        self.player_sprite_list.append(self.player_sprite)
 90
 91        # Create the coins
 92        for i in range(COIN_COUNT):
 93
 94            # Create the coin instance
 95            # Coin image from kenney.nl
 96            coin = Coin(":resources:images/items/coinGold.png", scale=SPRITE_SCALING_COIN)
 97
 98            # Position the coin
 99            coin.center_x = random.randrange(WINDOW_WIDTH)
100            coin.center_y = random.randrange(WINDOW_HEIGHT)
101
102            # Add the coin to the lists
103            self.coin_sprite_list.append(coin)
104
105    def on_draw(self):
106        """ Draw everything """
107        self.clear()
108        self.coin_sprite_list.draw()
109        self.player_sprite_list.draw()
110
111        # Put the text on the screen.
112        output = f"Score: {self.score}"
113        arcade.draw_text(output, 10, 20, arcade.color.WHITE, 14)
114
115    def on_mouse_motion(self, x, y, dx, dy):
116        """ Handle Mouse Motion """
117
118        # Move the center of the player sprite to match the mouse x, y
119        self.player_sprite.center_x = x
120        self.player_sprite.center_y = y
121
122    def on_update(self, delta_time):
123        """ Movement and game logic """
124
125        # Call update on all sprites (The sprites don't do much in this
126        # example though.)
127        self.coin_sprite_list.update(delta_time)
128
129        # Generate a list of all sprites that collided with the player.
130        hit_list = arcade.check_for_collision_with_list(self.player_sprite,
131                                                        self.coin_sprite_list)
132
133        # Loop through each colliding sprite, remove it, and add to the score.
134        for coin in hit_list:
135            coin.remove_from_sprite_lists()
136            self.score += 1
137
138
139def main():
140    """ Main function """
141    # Create a window class. This is what actually shows up on screen
142    window = arcade.Window(WINDOW_WIDTH, WINDOW_HEIGHT, WINDOW_TITLE)
143
144    # Create and setup the GameView
145    game = GameView()
146    game.setup()
147
148    # Show GameView on screen
149    window.show_view(game)
150
151    # Start the arcade game loop
152    arcade.run()
153
154
155if __name__ == "__main__":
156    main()