Step 3 - Scene Object#
Next we will add a Scene to our game. A Scene is a tool to manage a number of different SpriteLists by assigning each one a name, and maintaining a draw order.
SpriteLists can be drawn directly like we saw in step 2 of this tutorial, but a Scene can be helpful to handle a lot of different lists at once and being able to draw them all with one call to the scene.
To start with we will remove our sprite lists from the __init__
function, and replace them
with a scene object.
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
arcade.set_background_color(arcade.csscolor.CORNFLOWER_BLUE)
Next we will initialize the scene object in the setup
function and then add the SpriteLists to it
instead of creating new SpriteList objects directly.
Then instead of appending the Sprites to the SpriteLists directly, we can add them to the Scene and specify by name what SpriteList we want them added to.
def setup(self):
"""Set up the game here. Call this function to restart the game."""
# Initialize Scene
self.scene = arcade.Scene()
# Create the Sprite lists
self.scene.add_sprite_list("Player")
self.scene.add_sprite_list("Walls", use_spatial_hash=True)
# 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)
Lastly in our on_draw
function we can draw the scene.
def on_draw(self):
"""Render the screen."""
# Clear the screen to the background color
self.clear()
# Draw our Scene
self.scene.draw()
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 | """
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
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
arcade.set_background_color(arcade.csscolor.CORNFLOWER_BLUE)
def setup(self):
"""Set up the game here. Call this function to restart the game."""
# Initialize Scene
self.scene = arcade.Scene()
# Create the Sprite lists
self.scene.add_sprite_list("Player")
self.scene.add_sprite_list("Walls", use_spatial_hash=True)
# 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)
def on_draw(self):
"""Render the screen."""
# Clear the screen to the background color
self.clear()
# Draw our Scene
self.scene.draw()
def main():
"""Main function"""
window = MyGame()
window.setup()
arcade.run()
if __name__ == "__main__":
main()
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