Sprites That Follow The Player#
sprite_follow_simple.py#
1"""
2Sprite Follow Player
3
4This moves towards the player in both the x and y direction.
5
6Artwork from https://kenney.nl
7
8If Python and Arcade are installed, this example can be run from the command line with:
9python -m arcade.examples.sprite_follow_simple
10"""
11
12import random
13import arcade
14
15# --- Constants ---
16SPRITE_SCALING_PLAYER = 0.5
17SPRITE_SCALING_COIN = 0.2
18COIN_COUNT = 50
19
20SCREEN_WIDTH = 800
21SCREEN_HEIGHT = 600
22SCREEN_TITLE = "Sprite Follow Player Simple Example"
23
24SPRITE_SPEED = 0.5
25
26
27class Coin(arcade.Sprite):
28 """
29 This class represents the coins on our screen. It is a child class of
30 the arcade library's "Sprite" class.
31 """
32
33 def follow_sprite(self, player_sprite):
34 """
35 This function will move the current sprite towards whatever
36 other sprite is specified as a parameter.
37
38 We use the 'min' function here to get the sprite to line up with
39 the target sprite, and not jump around if the sprite is not off
40 an exact multiple of SPRITE_SPEED.
41 """
42
43 if self.center_y < player_sprite.center_y:
44 self.center_y += min(SPRITE_SPEED, player_sprite.center_y - self.center_y)
45 elif self.center_y > player_sprite.center_y:
46 self.center_y -= min(SPRITE_SPEED, self.center_y - player_sprite.center_y)
47
48 if self.center_x < player_sprite.center_x:
49 self.center_x += min(SPRITE_SPEED, player_sprite.center_x - self.center_x)
50 elif self.center_x > player_sprite.center_x:
51 self.center_x -= min(SPRITE_SPEED, self.center_x - player_sprite.center_x)
52
53
54class MyGame(arcade.Window):
55 """ Our custom Window Class"""
56
57 def __init__(self):
58 """ Initializer """
59 # Call the parent class initializer
60 super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
61
62 # Variables that will hold sprite lists
63 self.player_list = None
64 self.coin_list = None
65
66 # Set up the player info
67 self.player_sprite = None
68 self.score = 0
69
70 # Don't show the mouse cursor
71 self.set_mouse_visible(False)
72
73 self.background_color = arcade.color.AMAZON
74
75 def setup(self):
76 """ Set up the game and initialize the variables. """
77
78 # Sprite lists
79 self.player_list = arcade.SpriteList()
80 self.coin_list = arcade.SpriteList()
81
82 # Score
83 self.score = 0
84
85 # Set up the player
86 # Character image from kenney.nl
87 self.player_sprite = arcade.Sprite(
88 ":resources:images/animated_characters/female_person/femalePerson_idle.png",
89 scale=SPRITE_SCALING_PLAYER,
90 )
91 self.player_sprite.center_x = 50
92 self.player_sprite.center_y = 50
93 self.player_list.append(self.player_sprite)
94
95 # Create the coins
96 for i in range(COIN_COUNT):
97 # Create the coin instance
98 # Coin image from kenney.nl
99 coin = Coin(":resources:images/items/coinGold.png", scale=SPRITE_SCALING_COIN)
100
101 # Position the coin
102 coin.center_x = random.randrange(SCREEN_WIDTH)
103 coin.center_y = random.randrange(SCREEN_HEIGHT)
104
105 # Add the coin to the lists
106 self.coin_list.append(coin)
107
108 def on_draw(self):
109 """ Draw everything """
110 self.clear()
111 self.coin_list.draw()
112 self.player_list.draw()
113
114 # Put the text on the screen.
115 output = f"Score: {self.score}"
116 arcade.draw_text(output, 10, 20, arcade.color.WHITE, 14)
117
118 def on_mouse_motion(self, x, y, dx, dy):
119 """ Handle Mouse Motion """
120
121 # Move the center of the player sprite to match the mouse x, y
122 self.player_sprite.center_x = x
123 self.player_sprite.center_y = y
124
125 def on_update(self, delta_time):
126 """ Movement and game logic """
127
128 for coin in self.coin_list:
129 coin.follow_sprite(self.player_sprite)
130
131 # Generate a list of all sprites that collided with the player.
132 hit_list = arcade.check_for_collision_with_list(self.player_sprite, self.coin_list)
133
134 # Loop through each colliding sprite, remove it, and add to the score.
135 for coin in hit_list:
136 coin.remove_from_sprite_lists()
137 self.score += 1
138
139
140def main():
141 """ Main function """
142 window = MyGame()
143 window.setup()
144 arcade.run()
145
146
147if __name__ == "__main__":
148 main()