Hit Points and Health Bars¶
sprite_health.py¶
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 | """
Sprite Hit Points and Health Bars
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_health
"""
import random
import arcade
SPRITE_SCALING_PLAYER = 0.5
SPRITE_SCALING_COIN = 0.2
SPRITE_SCALING_LASER = 0.8
COIN_COUNT = 50
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
SCREEN_TITLE = "Hit Points and Health Bars "
BULLET_SPEED = 5
HEALTHBAR_WIDTH = 25
HEALTHBAR_HEIGHT = 3
HEALTHBAR_OFFSET_Y = -10
HEALTH_NUMBER_OFFSET_X = -10
HEALTH_NUMBER_OFFSET_Y = -25
class SpriteWithHealth(arcade.Sprite):
""" Sprite with hit points """
def __init__(self, image, scale, max_health):
super().__init__(image, scale)
# Add extra attributes for health
self.max_health = max_health
self.cur_health = max_health
def draw_health_number(self):
""" Draw how many hit points we have """
health_string = f"{self.cur_health}/{self.max_health}"
arcade.draw_text(health_string,
start_x=self.center_x + HEALTH_NUMBER_OFFSET_X,
start_y=self.center_y + HEALTH_NUMBER_OFFSET_Y,
font_size=12,
color=arcade.color.WHITE)
def draw_health_bar(self):
""" Draw the health bar """
# Draw the 'unhealthy' background
if self.cur_health < self.max_health:
arcade.draw_rectangle_filled(center_x=self.center_x,
center_y=self.center_y + HEALTHBAR_OFFSET_Y,
width=HEALTHBAR_WIDTH,
height=3,
color=arcade.color.RED)
# Calculate width based on health
health_width = HEALTHBAR_WIDTH * (self.cur_health / self.max_health)
arcade.draw_rectangle_filled(center_x=self.center_x - 0.5 * (HEALTHBAR_WIDTH - health_width),
center_y=self.center_y - 10,
width=health_width,
height=HEALTHBAR_HEIGHT,
color=arcade.color.GREEN)
class MyGame(arcade.Window):
""" Main application class. """
def __init__(self):
""" Initializer """
# Call the parent class initializer
super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
# Variables that will hold sprite lists
self.player_list = None
self.coin_list = None
self.bullet_list = None
# Set up the player info
self.player_sprite = None
self.score = 0
# Don't show the mouse cursor
self.set_mouse_visible(False)
# Load sounds. Sounds from kenney.nl
self.gun_sound = arcade.load_sound(":resources:sounds/hurt5.wav")
self.hit_sound = arcade.load_sound(":resources:sounds/hit4.wav")
self.death_sound = arcade.load_sound(":resources:sounds/hit5.wav")
arcade.set_background_color(arcade.color.AMAZON)
def setup(self):
""" Set up the game and initialize the variables. """
# Sprite lists
self.player_list = arcade.SpriteList()
self.coin_list = arcade.SpriteList()
self.bullet_list = arcade.SpriteList()
# Set up the player
self.score = 0
# Image from kenney.nl
self.player_sprite = arcade.Sprite(":resources:images/animated_characters/female_person/femalePerson_idle.png", SPRITE_SCALING_PLAYER)
self.player_sprite.center_x = 50
self.player_sprite.center_y = 70
self.player_list.append(self.player_sprite)
# Create the coins
for i in range(COIN_COUNT):
# Create the coin instance
# Coin image from kenney.nl
coin = SpriteWithHealth(":resources:images/items/coinGold.png",
SPRITE_SCALING_COIN,
max_health=5)
# Position the coin
coin.center_x = random.randrange(SCREEN_WIDTH)
coin.center_y = random.randrange(150, SCREEN_HEIGHT)
# Add the coin to the lists
self.coin_list.append(coin)
# Set the background color
arcade.set_background_color(arcade.color.AMAZON)
def on_draw(self):
"""
Render the screen.
"""
# This command has to happen before we start drawing
arcade.start_render()
# Draw all the sprites.
self.coin_list.draw()
self.bullet_list.draw()
self.player_list.draw()
for coin in self.coin_list:
coin.draw_health_number()
coin.draw_health_bar()
# Render the text
arcade.draw_text(f"Score: {self.score}", 10, 20, arcade.color.WHITE, 14)
def on_mouse_motion(self, x, y, dx, dy):
"""
Called whenever the mouse moves.
"""
self.player_sprite.center_x = x
def on_mouse_press(self, x, y, button, modifiers):
"""
Called whenever the mouse button is clicked.
"""
# Gunshot sound
arcade.play_sound(self.gun_sound)
# Create a bullet
bullet = arcade.Sprite(":resources:images/space_shooter/laserBlue01.png", SPRITE_SCALING_LASER)
# The image points to the right, and we want it to point up. So
# rotate it.
bullet.angle = 90
# Give the bullet a speed
bullet.change_y = BULLET_SPEED
# Position the bullet
bullet.center_x = self.player_sprite.center_x
bullet.bottom = self.player_sprite.top
# Add the bullet to the appropriate lists
self.bullet_list.append(bullet)
def on_update(self, delta_time):
""" Movement and game logic """
# Call update on bullet sprites
self.bullet_list.update()
# Loop through each bullet
for bullet in self.bullet_list:
# Check this bullet to see if it hit a coin
hit_list = arcade.check_for_collision_with_list(bullet, self.coin_list)
# If it did, get rid of the bullet
if len(hit_list) > 0:
bullet.remove_from_sprite_lists()
# For every coin we hit, process
for coin in hit_list:
# Make sure this is the right type of class
if not isinstance(coin, SpriteWithHealth):
raise TypeError("List contents must be all ints")
# Remove one health point
coin.cur_health -= 1
# Check health
if coin.cur_health <= 0:
# Dead
coin.remove_from_sprite_lists()
self.score += 1
arcade.play_sound(self.death_sound)
else:
# Not dead
arcade.play_sound(self.hit_sound)
# If the bullet flies off-screen, remove it.
if bullet.bottom > SCREEN_HEIGHT:
bullet.remove_from_sprite_lists()
def main():
""" Main Program """
window = MyGame()
window.setup()
arcade.run()
if __name__ == "__main__":
main()
|