# 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 http://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
15import os
16
17SPRITE_SCALING = 0.5
18
19SCREEN_WIDTH = 800
20SCREEN_HEIGHT = 600
21SCREEN_TITLE = "Sprite Collect Coins Moving in Circles Example"
22
23
25
26    def __init__(self, filename, sprite_scaling):
27        """ Constructor. """
28        # Call the parent class (Sprite) constructor
29        super().__init__(filename, sprite_scaling)
30
31        # Current angle in radians
32        self.circle_angle = 0
33
34        # How far away from the center to orbit, in pixels
36
37        # How fast to orbit, in radians per frame
38        self.circle_speed = 0.008
39
40        # Set the center of the point we will orbit around
41        self.circle_center_x = 0
42        self.circle_center_y = 0
43
44    def update(self):
45
46        """ Update the ball's position. """
47        # Calculate a new x, y
48        self.center_x = self.circle_radius * math.sin(self.circle_angle) \
49            + self.circle_center_x
50        self.center_y = self.circle_radius * math.cos(self.circle_angle) \
51            + self.circle_center_y
52
53        # Increase the angle in prep for the next round.
54        self.circle_angle += self.circle_speed
55
56
58    """ Main application class. """
59
60    def __init__(self, width, height, title):
61
62        super().__init__(width, height, title)
63
64        # Set the working directory (where we expect to find files) to the same
65        # directory this .py file is in. You can leave this out of your own
66        # code, but it is needed to easily run the examples using "python -m"
67        # as mentioned at the top of this program.
68        file_path = os.path.dirname(os.path.abspath(__file__))
69        os.chdir(file_path)
70
71        # Sprite lists
72        self.all_sprites_list = None
73        self.coin_list = None
74
75        # Set up the player
76        self.score = 0
77        self.player_sprite = None
78
79    def start_new_game(self):
80        """ Set up the game and initialize the variables. """
81
82        # Sprite lists
85
86        # Set up the player
87        self.score = 0
88        # Character image from kenney.nl
90        self.player_sprite.center_x = 50
91        self.player_sprite.center_y = 70
92        self.all_sprites_list.append(self.player_sprite)
93
94        for i in range(50):
95
96            # Create the coin instance
97            # Coin image from kenney.nl
98            coin = Coin(":resources:images/items/coinGold.png", SPRITE_SCALING / 3)
99
100            # Position the center of the circle the coin will orbit
101            coin.circle_center_x = random.randrange(SCREEN_WIDTH)
102            coin.circle_center_y = random.randrange(SCREEN_HEIGHT)
103
104            # Random radius from 10 to 200
106
107            # Random start angle from 0 to 2pi
108            coin.circle_angle = random.random() * 2 * math.pi
109
110            # Add the coin to the lists
111            self.all_sprites_list.append(coin)
112            self.coin_list.append(coin)
113
114        # Don't show the mouse cursor
115        self.set_mouse_visible(False)
116
117        # Set the background color
119
120    def on_draw(self):
121
122        # This command has to happen before we start drawing
124
125        # Draw all the sprites.
126        self.all_sprites_list.draw()
127
128        # Put the text on the screen.
129        output = "Score: " + str(self.score)
131
132    def on_mouse_motion(self, x, y, dx, dy):
133        self.player_sprite.center_x = x
134        self.player_sprite.center_y = y
135
136    def on_update(self, delta_time):
137        """ Movement and game logic """
138
139        # Call update on all sprites (The sprites don't do much in this
140        # example though.)
141        self.all_sprites_list.update()
142
143        # Generate a list of all sprites that collided with the player.
145                                                        self.coin_list)
146
147        # Loop through each colliding sprite, remove it, and add to the score.
148        for coin in hit_list:
149            self.score += 1
150            coin.remove_from_sprite_lists()
151
152
153def main():
154    window = MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
155    window.start_new_game()