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 http://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
14import os
15
16# --- Constants ---
17SPRITE_SCALING_PLAYER = 0.5
18SPRITE_SCALING_COIN = 0.2
19COIN_COUNT = 50
20
21SCREEN_WIDTH = 800
22SCREEN_HEIGHT = 600
23SCREEN_TITLE = "Sprite Follow Player Simple Example"
24
25SPRITE_SPEED = 0.5
26
27
28class Coin(arcade.Sprite):
29 """
30 This class represents the coins on our screen. It is a child class of
31 the arcade library's "Sprite" class.
32 """
33
34 def follow_sprite(self, player_sprite):
35 """
36 This function will move the current sprite towards whatever
37 other sprite is specified as a parameter.
38
39 We use the 'min' function here to get the sprite to line up with
40 the target sprite, and not jump around if the sprite is not off
41 an exact multiple of SPRITE_SPEED.
42 """
43
44 if self.center_y < player_sprite.center_y:
45 self.center_y += min(SPRITE_SPEED, player_sprite.center_y - self.center_y)
46 elif self.center_y > player_sprite.center_y:
47 self.center_y -= min(SPRITE_SPEED, self.center_y - player_sprite.center_y)
48
49 if self.center_x < player_sprite.center_x:
50 self.center_x += min(SPRITE_SPEED, player_sprite.center_x - self.center_x)
51 elif self.center_x > player_sprite.center_x:
52 self.center_x -= min(SPRITE_SPEED, self.center_x - player_sprite.center_x)
53
54
55class MyGame(arcade.Window):
56 """ Our custom Window Class"""
57
58 def __init__(self):
59 """ Initializer """
60 # Call the parent class initializer
61 super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
62
63 # Set the working directory (where we expect to find files) to the same
64 # directory this .py file is in. You can leave this out of your own
65 # code, but it is needed to easily run the examples using "python -m"
66 # as mentioned at the top of this program.
67 file_path = os.path.dirname(os.path.abspath(__file__))
68 os.chdir(file_path)
69
70 # Variables that will hold sprite lists
71 self.player_list = None
72 self.coin_list = None
73
74 # Set up the player info
75 self.player_sprite = None
76 self.score = 0
77
78 # Don't show the mouse cursor
79 self.set_mouse_visible(False)
80
81 arcade.set_background_color(arcade.color.AMAZON)
82
83 def setup(self):
84 """ Set up the game and initialize the variables. """
85
86 # Sprite lists
87 self.player_list = arcade.SpriteList()
88 self.coin_list = arcade.SpriteList()
89
90 # Score
91 self.score = 0
92
93 # Set up the player
94 # Character image from kenney.nl
95 self.player_sprite = arcade.Sprite(":resources:images/animated_characters/female_person/femalePerson_idle.png", SPRITE_SCALING_PLAYER)
96 self.player_sprite.center_x = 50
97 self.player_sprite.center_y = 50
98 self.player_list.append(self.player_sprite)
99
100 # Create the coins
101 for i in range(COIN_COUNT):
102 # Create the coin instance
103 # Coin image from kenney.nl
104 coin = Coin(":resources:images/items/coinGold.png", SPRITE_SCALING_COIN)
105
106 # Position the coin
107 coin.center_x = random.randrange(SCREEN_WIDTH)
108 coin.center_y = random.randrange(SCREEN_HEIGHT)
109
110 # Add the coin to the lists
111 self.coin_list.append(coin)
112
113 def on_draw(self):
114 """ Draw everything """
115 arcade.start_render()
116 self.coin_list.draw()
117 self.player_list.draw()
118
119 # Put the text on the screen.
120 output = f"Score: {self.score}"
121 arcade.draw_text(output, 10, 20, arcade.color.WHITE, 14)
122
123 def on_mouse_motion(self, x, y, dx, dy):
124 """ Handle Mouse Motion """
125
126 # Move the center of the player sprite to match the mouse x, y
127 self.player_sprite.center_x = x
128 self.player_sprite.center_y = y
129
130 def on_update(self, delta_time):
131 """ Movement and game logic """
132
133 for coin in self.coin_list:
134 coin.follow_sprite(self.player_sprite)
135
136 # Generate a list of all sprites that collided with the player.
137 hit_list = arcade.check_for_collision_with_list(self.player_sprite, self.coin_list)
138
139 # Loop through each colliding sprite, remove it, and add to the score.
140 for coin in hit_list:
141 coin.remove_from_sprite_lists()
142 self.score += 1
143
144
145def main():
146 """ Main method """
147 window = MyGame()
148 window.setup()
149 arcade.run()
150
151
152if __name__ == "__main__":
153 main()