# Collect Coins that are Moving in a Circle¶

sprite_collect_coins_move_circle.py
```  1"""
2Sprite Collect Coins Moving in Circles
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:
10"""
11
12import random
14import math
15
16SPRITE_SCALING = 0.5
17
18SCREEN_WIDTH = 800
19SCREEN_HEIGHT = 600
20SCREEN_TITLE = "Sprite Collect Coins Moving in Circles Example"
21
22
24
25    def __init__(self, filename, scale):
26        """ Constructor. """
27        # Call the parent class (Sprite) constructor
28        super().__init__(filename, scale=scale)
29
30        # Current angle in radians
31        self.circle_angle = 0
32
33        # How far away from the center to orbit, in pixels
35
36        # How fast to orbit, in radians per frame
37        self.circle_speed = 0.008
38
39        # Set the center of the point we will orbit around
40        self.circle_center_x = 0
41        self.circle_center_y = 0
42
43    def update(self):
44
45        """ Update the ball's position. """
46        # Calculate a new x, y
47        self.center_x = self.circle_radius * math.sin(self.circle_angle) \
48            + self.circle_center_x
49        self.center_y = self.circle_radius * math.cos(self.circle_angle) \
50            + self.circle_center_y
51
52        # Increase the angle in prep for the next round.
53        self.circle_angle += self.circle_speed
54
55
57    """ Main application class. """
58
59    def __init__(self, width, height, title):
60
61        super().__init__(width, height, title)
62
63        # Sprite lists
64        self.all_sprites_list = None
65        self.coin_list = None
66
67        # Set up the player
68        self.score = 0
69        self.player_sprite = None
70
71    def start_new_game(self):
72        """ Set up the game and initialize the variables. """
73
74        # Sprite lists
77
78        # Set up the player
79        self.score = 0
80        # Character image from kenney.nl
82            ":resources:images/animated_characters/female_person/femalePerson_idle.png",
83            scale=SPRITE_SCALING
84        )
85        self.player_sprite.center_x = 50
86        self.player_sprite.center_y = 70
87        self.all_sprites_list.append(self.player_sprite)
88
89        for i in range(50):
90
91            # Create the coin instance
92            # Coin image from kenney.nl
93            coin = Coin(":resources:images/items/coinGold.png", scale=SPRITE_SCALING / 3)
94
95            # Position the center of the circle the coin will orbit
96            coin.circle_center_x = random.randrange(SCREEN_WIDTH)
97            coin.circle_center_y = random.randrange(SCREEN_HEIGHT)
98
99            # Random radius from 10 to 200
101
102            # Random start angle from 0 to 2pi
103            coin.circle_angle = random.random() * 2 * math.pi
104
105            # Add the coin to the lists
106            self.all_sprites_list.append(coin)
107            self.coin_list.append(coin)
108
109        # Don't show the mouse cursor
110        self.set_mouse_visible(False)
111
112        # Set the background color
114
115    def on_draw(self):
116
117        # This command has to happen before we start drawing
118        self.clear()
119
120        # Draw all the sprites.
121        self.all_sprites_list.draw()
122
123        # Put the text on the screen.
124        output = "Score: " + str(self.score)
126
127    def on_mouse_motion(self, x, y, dx, dy):
128        self.player_sprite.center_x = x
129        self.player_sprite.center_y = y
130
131    def on_update(self, delta_time):
132        """ Movement and game logic """
133
134        # Call update on all sprites (The sprites don't do much in this
135        # example though.)
136        self.all_sprites_list.update()
137
138        # Generate a list of all sprites that collided with the player.
140                                                        self.coin_list)
141
142        # Loop through each colliding sprite, remove it, and add to the score.
143        for coin in hit_list:
144            self.score += 1
145            coin.remove_from_sprite_lists()
146
147
148def main():
149    window = MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
150    window.start_new_game()
152
153
154if __name__ == "__main__":
155    main()
```