Collect Coins Moving Down

Screenshot of using sprites to collect coins
sprite_collect_coins_move_down.py
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"""
Sprite Collect Coins

Simple program to show basic sprite usage.

Artwork from http://kenney.nl
"""
import random
import arcade

SPRITE_SCALING = 0.5

SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600


class Coin(arcade.Sprite):
    """
    This class represents the coins on our screen. It is a child class of
    the arcade library's "Sprite" class.
    """

    def reset_pos(self):

        # Reset the coin to a random spot above the screen
        self.center_y = random.randrange(SCREEN_HEIGHT + 20,
                                         SCREEN_HEIGHT + 100)
        self.center_x = random.randrange(SCREEN_WIDTH)

    def update(self):

        # Move the coin
        # This is not an efficient way to move all the coins the same direction
        # and speed. This forces all the coin information to be reloaded to the
        # GPU. It would be better to just translate all the coins in one operation.
        # A better way is shown in # sprite_collect_coins_move_down_improved.py
        self.center_y -= 1

        # See if the coin has fallen off the bottom of the screen.
        # If so, reset it.
        if self.top < 0:
            self.reset_pos()


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

    def __init__(self, width, height):
        """
        Initializer
        :param width:
        :param height:
        """
        super().__init__(width, height)
        # Sprite lists
        self.all_sprites_list = None
        self.coin_list = None

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

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

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

        # Set up the player
        self.score = 0
        self.player_sprite = arcade.Sprite("images/character.png",
                                           SPRITE_SCALING)
        self.player_sprite.center_x = 50
        self.player_sprite.center_y = 70
        self.all_sprites_list.append(self.player_sprite)

        for i in range(50):

            # Create the coin instance
            coin = Coin("images/coin_01.png", SPRITE_SCALING / 3)

            # Position the coin
            coin.center_x = random.randrange(SCREEN_WIDTH)
            coin.center_y = random.randrange(SCREEN_HEIGHT)

            # Add the coin to the lists
            self.all_sprites_list.append(coin)
            self.coin_list.append(coin)

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

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

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

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

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

        # Put the text on the screen.
        output = "Score: {}".format(self.score)
        arcade.draw_text(output, 10, 20, arcade.color.WHITE, 14)

    def on_mouse_motion(self, x, y, dx, dy):
        """
        Called whenever the mouse moves.
        """
        self.player_sprite.center_x = x
        self.player_sprite.center_y = y

    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.all_sprites_list.update()

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

        # Loop through each colliding sprite, remove it, and add to the score.
        for coin in hit_list:
            coin.reset_pos()
            self.score += 1


def main():
    window = MyAppWindow(SCREEN_WIDTH, SCREEN_HEIGHT)
    window.start_new_game()
    arcade.run()


if __name__ == "__main__":
    main()