Step 7 - Add Coins And Sound#
Next we will add some coins that the player can pickup. We’ll also add a sound to be played when they pick it up, as well as a sound for when they jump.
Adding Coins to the Scene#
First we need to add our coins to the scene. Let’s start by adding a constant at the
top of our application for the coin sprite scaling, similar to our TILE_SCALING
one.
COIN_SCALING = 0.5
Next in our setup
function we can create our coins using a for loop like we’ve done for
the ground previously, and then add them to the scene.
# Use a loop to place some coins for our character to pick up
for x in range(128, 1250, 256):
coin = arcade.Sprite(":resources:images/items/coinGold.png", COIN_SCALING)
coin.center_x = x
coin.center_y = 96
self.scene.add_sprite("Coins", coin)
Loading Sounds#
Now we can load in our sounds for collecting the coin and jumping. Later we will use these
variables to play the sounds when the specific events happen. Add the following to the
__init__
function to load the sounds:
# Load sounds
self.collect_coin_sound = arcade.load_sound(":resources:sounds/coin1.wav")
self.jump_sound = arcade.load_sound(":resources:sounds/jump1.wav")
Then we can play our jump sound when the player jumps, by adding it to the on_key_press
function:
def on_key_press(self, key, modifiers):
"""Called whenever a key is pressed."""
if key == arcade.key.UP or key == arcade.key.W:
if self.physics_engine.can_jump():
self.player_sprite.change_y = PLAYER_JUMP_SPEED
arcade.play_sound(self.jump_sound)
elif key == arcade.key.LEFT or key == arcade.key.A:
self.player_sprite.change_x = -PLAYER_MOVEMENT_SPEED
elif key == arcade.key.RIGHT or key == arcade.key.D:
self.player_sprite.change_x = PLAYER_MOVEMENT_SPEED
Collision Detection#
Lastly, we need to find out if the player hit a coin. We can do this in our on_update
function by using the arcade.check_for_collision_with_list
function. We can pass the
player sprite, along with a SpriteList
that holds the coins. The function will return
a list of the coins that the player is currently colliding with. If there are no coins in
contact, the list will be empty.
Then we can use the Sprite.remove_from_sprite_lists
function which will remove a given
sprite from any SpriteLists it belongs to, effectively deleting it from the game.
Note
Notice that any transparent “white-space” around the image counts as the hitbox. You can trim the space in a graphics editor, or later on, we’ll go over how to customize the hitbox of a Sprite.
Add the following to the on_update
function to add collision detection and play a sound
when the player picks up a coin.
# See if we hit any coins
coin_hit_list = arcade.check_for_collision_with_list(
self.player_sprite, self.scene["Coins"]
)
# Loop through each coin we hit (if any) and remove it
for coin in coin_hit_list:
# Remove the coin
coin.remove_from_sprite_lists()
# Play a sound
arcade.play_sound(self.collect_coin_sound)
Note
Spend time placing the coins where you would like them. If you have extra time, try adding more than just coins. Also add gems or keys from the graphics provided.
You could also subclass the coin sprite and add an attribute for a score value. Then you could have coins worth one point, and gems worth 5, 10, and 15 points.
Source Code#
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 | """
Platformer Game
"""
import arcade
# Constants
SCREEN_WIDTH = 1000
SCREEN_HEIGHT = 650
SCREEN_TITLE = "Platformer"
# Constants used to scale our sprites from their original size
CHARACTER_SCALING = 1
TILE_SCALING = 0.5
COIN_SCALING = 0.5
# Movement speed of player, in pixels per frame
PLAYER_MOVEMENT_SPEED = 5
GRAVITY = 1
PLAYER_JUMP_SPEED = 20
class MyGame(arcade.Window):
"""
Main application class.
"""
def __init__(self):
# Call the parent class and set up the window
super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
# Our Scene Object
self.scene = None
# Separate variable that holds the player sprite
self.player_sprite = None
# Our physics engine
self.physics_engine = None
# A Camera that can be used for scrolling the screen
self.camera = None
# Load sounds
self.collect_coin_sound = arcade.load_sound(":resources:sounds/coin1.wav")
self.jump_sound = arcade.load_sound(":resources:sounds/jump1.wav")
arcade.set_background_color(arcade.csscolor.CORNFLOWER_BLUE)
def setup(self):
"""Set up the game here. Call this function to restart the game."""
# Set up the Camera
self.camera = arcade.Camera(self.width, self.height)
# Initialize Scene
self.scene = arcade.Scene()
# Set up the player, specifically placing it at these coordinates.
image_source = ":resources:images/animated_characters/female_adventurer/femaleAdventurer_idle.png"
self.player_sprite = arcade.Sprite(image_source, CHARACTER_SCALING)
self.player_sprite.center_x = 64
self.player_sprite.center_y = 128
self.scene.add_sprite("Player", self.player_sprite)
# Create the ground
# This shows using a loop to place multiple sprites horizontally
for x in range(0, 1250, 64):
wall = arcade.Sprite(":resources:images/tiles/grassMid.png", TILE_SCALING)
wall.center_x = x
wall.center_y = 32
self.scene.add_sprite("Walls", wall)
# Put some crates on the ground
# This shows using a coordinate list to place sprites
coordinate_list = [[512, 96], [256, 96], [768, 96]]
for coordinate in coordinate_list:
# Add a crate on the ground
wall = arcade.Sprite(
":resources:images/tiles/boxCrate_double.png", TILE_SCALING
)
wall.position = coordinate
self.scene.add_sprite("Walls", wall)
# Use a loop to place some coins for our character to pick up
for x in range(128, 1250, 256):
coin = arcade.Sprite(":resources:images/items/coinGold.png", COIN_SCALING)
coin.center_x = x
coin.center_y = 96
self.scene.add_sprite("Coins", coin)
# Create the 'physics engine'
self.physics_engine = arcade.PhysicsEnginePlatformer(
self.player_sprite, gravity_constant=GRAVITY, walls=self.scene["Walls"]
)
def on_draw(self):
"""Render the screen."""
# Clear the screen to the background color
self.clear()
# Activate our Camera
self.camera.use()
# Draw our Scene
self.scene.draw()
def on_key_press(self, key, modifiers):
"""Called whenever a key is pressed."""
if key == arcade.key.UP or key == arcade.key.W:
if self.physics_engine.can_jump():
self.player_sprite.change_y = PLAYER_JUMP_SPEED
arcade.play_sound(self.jump_sound)
elif key == arcade.key.LEFT or key == arcade.key.A:
self.player_sprite.change_x = -PLAYER_MOVEMENT_SPEED
elif key == arcade.key.RIGHT or key == arcade.key.D:
self.player_sprite.change_x = PLAYER_MOVEMENT_SPEED
def on_key_release(self, key, modifiers):
"""Called when the user releases a key."""
if key == arcade.key.LEFT or key == arcade.key.A:
self.player_sprite.change_x = 0
elif key == arcade.key.RIGHT or key == arcade.key.D:
self.player_sprite.change_x = 0
def center_camera_to_player(self):
screen_center_x = self.player_sprite.center_x - (self.camera.viewport_width / 2)
screen_center_y = self.player_sprite.center_y - (
self.camera.viewport_height / 2
)
if screen_center_x < 0:
screen_center_x = 0
if screen_center_y < 0:
screen_center_y = 0
player_centered = screen_center_x, screen_center_y
self.camera.move_to(player_centered)
def on_update(self, delta_time):
"""Movement and game logic"""
# Move the player with the physics engine
self.physics_engine.update()
# See if we hit any coins
coin_hit_list = arcade.check_for_collision_with_list(
self.player_sprite, self.scene["Coins"]
)
# Loop through each coin we hit (if any) and remove it
for coin in coin_hit_list:
# Remove the coin
coin.remove_from_sprite_lists()
# Play a sound
arcade.play_sound(self.collect_coin_sound)
# Position the camera
self.center_camera_to_player()
def main():
"""Main function"""
window = MyGame()
window.setup()
arcade.run()
if __name__ == "__main__":
main()
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