Collect Coins that are Moving in a Circle

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

Simple program to show basic sprite usage.

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

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 __init__(self, filename, sprite_scaling):
        """ Constructor. """
        # Call the parent class (Sprite) constructor
        super().__init__(filename, sprite_scaling)

        # Current angle in radians
        self.angle = 0

        # How far away from the center to orbit, in pixels
        self.radius = 0

        # How fast to orbit, in radians per frame
        self.speed = 0.008

        # Set the center of the point we will orbit around
        self.circle_center_x = 0
        self.circle_center_y = 0

    def update(self):

        """ Update the ball's position. """
        # Calculate a new x, y
        self.center_x = self.radius * math.sin(self.angle) \
            + self.circle_center_x
        self.center_y = self.radius * math.cos(self.angle) \
            + self.circle_center_y

        # Increase the angle in prep for the next round.
        self.angle += self.speed


class MyApplication(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 setup(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 center of the circle the coin will orbit
            coin.circle_center_x = random.randrange(SCREEN_WIDTH)
            coin.circle_center_y = random.randrange(SCREEN_HEIGHT)

            # Random radius from 10 to 200
            coin.radius = random.randrange(10, 200)

            # Random start angle from 0 to 2pi
            coin.angle = random.random() * 2 * math.pi

            # 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.kill()
            self.score += 1


window = MyApplication(SCREEN_WIDTH, SCREEN_HEIGHT)
window.setup()

arcade.run()