Aim and Shoot Bullets¶
sprite_bullets_aimed.py¶
1"""
2Sprite Bullets
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:
9python -m arcade.examples.sprite_bullets_aimed
10"""
11
12import random
13import arcade
14import math
15import os
16
17SPRITE_SCALING_PLAYER = 0.5
18SPRITE_SCALING_COIN = 0.2
19SPRITE_SCALING_LASER = 0.8
20COIN_COUNT = 50
21
22SCREEN_WIDTH = 800
23SCREEN_HEIGHT = 600
24SCREEN_TITLE = "Sprites and Bullets Aimed Example"
25
26BULLET_SPEED = 5
27
28window = None
29
30
31class MyGame(arcade.Window):
32 """ Main application class. """
33
34 def __init__(self):
35 """ Initializer """
36 # Call the parent class initializer
37 super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
38
39 # Set the working directory (where we expect to find files) to the same
40 # directory this .py file is in. You can leave this out of your own
41 # code, but it is needed to easily run the examples using "python -m"
42 # as mentioned at the top of this program.
43 file_path = os.path.dirname(os.path.abspath(__file__))
44 os.chdir(file_path)
45
46 # Variables that will hold sprite lists
47 self.player_list = None
48 self.coin_list = None
49 self.bullet_list = None
50
51 # Set up the player info
52 self.player_sprite = None
53 self.score = 0
54 self.score_text = None
55
56 # Load sounds. Sounds from kenney.nl
57 self.gun_sound = arcade.sound.load_sound(":resources:sounds/laser1.wav")
58 self.hit_sound = arcade.sound.load_sound(":resources:sounds/phaseJump1.wav")
59
60 arcade.set_background_color(arcade.color.AMAZON)
61
62 def setup(self):
63
64 """ Set up the game and initialize the variables. """
65
66 # Sprite lists
67 self.player_list = arcade.SpriteList()
68 self.coin_list = arcade.SpriteList()
69 self.bullet_list = arcade.SpriteList()
70
71 # Set up the player
72 self.score = 0
73
74 # Image from kenney.nl
75 self.player_sprite = arcade.Sprite(":resources:images/animated_characters/female_person/femalePerson_idle.png", SPRITE_SCALING_PLAYER)
76 self.player_sprite.center_x = 50
77 self.player_sprite.center_y = 70
78 self.player_list.append(self.player_sprite)
79
80 # Create the coins
81 for i in range(COIN_COUNT):
82
83 # Create the coin instance
84 # Coin image from kenney.nl
85 coin = arcade.Sprite(":resources:images/items/coinGold.png", SPRITE_SCALING_COIN)
86
87 # Position the coin
88 coin.center_x = random.randrange(SCREEN_WIDTH)
89 coin.center_y = random.randrange(120, SCREEN_HEIGHT)
90
91 # Add the coin to the lists
92 self.coin_list.append(coin)
93
94 # Set the background color
95 arcade.set_background_color(arcade.color.AMAZON)
96
97 def on_draw(self):
98 """ Render the screen. """
99
100 # This command has to happen before we start drawing
101 arcade.start_render()
102
103 # Draw all the sprites.
104 self.coin_list.draw()
105 self.bullet_list.draw()
106 self.player_list.draw()
107
108 # Put the text on the screen.
109 output = f"Score: {self.score}"
110 arcade.draw_text(output, 10, 20, arcade.color.WHITE, 14)
111
112 def on_mouse_press(self, x, y, button, modifiers):
113 """ Called whenever the mouse button is clicked. """
114
115 # Create a bullet
116 bullet = arcade.Sprite(":resources:images/space_shooter/laserBlue01.png", SPRITE_SCALING_LASER)
117
118 # Position the bullet at the player's current location
119 start_x = self.player_sprite.center_x
120 start_y = self.player_sprite.center_y
121 bullet.center_x = start_x
122 bullet.center_y = start_y
123
124 # Get from the mouse the destination location for the bullet
125 # IMPORTANT! If you have a scrolling screen, you will also need
126 # to add in self.view_bottom and self.view_left.
127 dest_x = x
128 dest_y = y
129
130 # Do math to calculate how to get the bullet to the destination.
131 # Calculation the angle in radians between the start points
132 # and end points. This is the angle the bullet will travel.
133 x_diff = dest_x - start_x
134 y_diff = dest_y - start_y
135 angle = math.atan2(y_diff, x_diff)
136
137 # Angle the bullet sprite so it doesn't look like it is flying
138 # sideways.
139 bullet.angle = math.degrees(angle)
140 print(f"Bullet angle: {bullet.angle:.2f}")
141
142 # Taking into account the angle, calculate our change_x
143 # and change_y. Velocity is how fast the bullet travels.
144 bullet.change_x = math.cos(angle) * BULLET_SPEED
145 bullet.change_y = math.sin(angle) * BULLET_SPEED
146
147 # Add the bullet to the appropriate lists
148 self.bullet_list.append(bullet)
149
150 def on_update(self, delta_time):
151 """ Movement and game logic """
152
153 # Call update on all sprites
154 self.bullet_list.update()
155
156 # Loop through each bullet
157 for bullet in self.bullet_list:
158
159 # Check this bullet to see if it hit a coin
160 hit_list = arcade.check_for_collision_with_list(bullet, self.coin_list)
161
162 # If it did, get rid of the bullet
163 if len(hit_list) > 0:
164 bullet.remove_from_sprite_lists()
165
166 # For every coin we hit, add to the score and remove the coin
167 for coin in hit_list:
168 coin.remove_from_sprite_lists()
169 self.score += 1
170
171 # If the bullet flies off-screen, remove it.
172 if bullet.bottom > self.width or bullet.top < 0 or bullet.right < 0 or bullet.left > self.width:
173 bullet.remove_from_sprite_lists()
174
175
176def main():
177 game = MyGame()
178 game.setup()
179 arcade.run()
180
181
182if __name__ == "__main__":
183 main()