# Collect Coins that are Moving in a Circle¶

For an explanation on how this code works, see:

  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 """ Sprite Collect Coins Simple program to show basic sprite usage. Artwork from http://kenney.nl If Python and Arcade are installed, this example can be run from the command line with: python -m arcade.examples.sprite_collect_coins_move_circle """ import random import arcade import math import os SPRITE_SCALING = 0.5 SCREEN_WIDTH = 800 SCREEN_HEIGHT = 600 class Coin(arcade.Sprite): def __init__(self, filename, sprite_scaling): """ Constructor. """ # Call the parent class (Sprite) constructor super().__init__(filename, sprite_scaling) # Current angle in radians self.circle_angle = 0 # How far away from the center to orbit, in pixels self.circle_radius = 0 # How fast to orbit, in radians per frame self.circle_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.circle_radius * math.sin(self.circle_angle) \ + self.circle_center_x self.center_y = self.circle_radius * math.cos(self.circle_angle) \ + self.circle_center_y # Increase the angle in prep for the next round. self.circle_angle += self.circle_speed class MyGame(arcade.Window): """ Main application class. """ def __init__(self, width, height): super().__init__(width, height) # Set the working directory (where we expect to find files) to the same # directory this .py file is in. You can leave this out of your own # code, but it is needed to easily run the examples using "python -m" # as mentioned at the top of this program. file_path = os.path.dirname(os.path.abspath(__file__)) os.chdir(file_path) # 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 # Character image from kenney.nl 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 image from kenney.nl 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.circle_radius = random.randrange(10, 200) # Random start angle from 0 to 2pi coin.circle_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): # 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: " + str(self.score) arcade.draw_text(output, 10, 20, arcade.color.WHITE, 14) def on_mouse_motion(self, x, y, dx, dy): 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: self.score += 1 coin.kill() def main(): window = MyGame(SCREEN_WIDTH, SCREEN_HEIGHT) window.start_new_game() arcade.run() if __name__ == "__main__": main()