"""
Use sprites to scroll around a large screen.
Simple program to show basic sprite usage.
Artwork from http://kenney.nl
"""
import random
import arcade
SPRITE_SCALING = 0.5
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
# How many pixels to keep as a minimum margin between the character
# and the edge of the screen.
VIEWPORT_MARGIN = 40
MOVEMENT_SPEED = 5
class MyApplication(arcade.Window):
""" Main application class. """
def __init__(self, width, height):
"""
Initializer
:param width:
:param height:
"""
super().__init__(width, height)
# Sprite lists
self.all_sprites_list = None
self.coin_list = None
# Set up the player
self.score = 0
self.player_sprite = None
self.wall_list = None
self.physics_engine = None
self.view_bottom = 0
self.view_left = 0
def setup(self):
""" Set up the game and initialize the variables. """
# Sprite lists
self.all_sprites_list = arcade.SpriteList()
self.wall_list = arcade.SpriteList()
# Set up the player
self.score = 0
self.player_sprite = arcade.Sprite("images/character.png",
0.4)
self.player_sprite.center_x = 64
self.player_sprite.center_y = 270
self.all_sprites_list.append(self.player_sprite)
# -- Set up several columns of walls
for x in range(200, 1650, 210):
for y in range(0, 1000, 64):
# Randomly skip a box so the player can find a way through
if random.randrange(5) > 0:
wall = arcade.Sprite("images/boxCrate_double.png",
SPRITE_SCALING)
wall.center_x = x
wall.center_y = y
self.all_sprites_list.append(wall)
self.wall_list.append(wall)
self.physics_engine = arcade.PhysicsEngineSimple(self.player_sprite,
self.wall_list)
# Set the background color
arcade.set_background_color(arcade.color.AMAZON)
# Set the viewport boundaries
# These numbers set where we have 'scrolled' to.
self.view_left = 0
self.view_bottom = 0
def on_draw(self):
"""
Render the screen.
"""
# This command has to happen before we start drawing
arcade.start_render()
# Draw all the sprites.
self.all_sprites_list.draw()
# Put the text on the screen.
# Adjust the text position based on the viewport so that we don't
# scroll the text too.
output = "Score: {}".format(self.score)
arcade.draw_text(output, self.view_left + 10, self.view_bottom + 20,
arcade.color.WHITE, 14)
def on_key_press(self, key, modifiers):
"""
Called whenever the mouse moves.
"""
if key == arcade.key.UP:
self.player_sprite.change_y = MOVEMENT_SPEED
elif key == arcade.key.DOWN:
self.player_sprite.change_y = -MOVEMENT_SPEED
elif key == arcade.key.LEFT:
self.player_sprite.change_x = -MOVEMENT_SPEED
elif key == arcade.key.RIGHT:
self.player_sprite.change_x = MOVEMENT_SPEED
def on_key_release(self, key, modifiers):
"""
Called when the user presses a mouse button.
"""
if key == arcade.key.UP or key == arcade.key.DOWN:
self.player_sprite.change_y = 0
elif key == arcade.key.LEFT or key == arcade.key.RIGHT:
self.player_sprite.change_x = 0
def animate(self, delta_time):
""" Movement and game logic """
# Call update on all sprites (The sprites don't do much in this
# example though.)
self.physics_engine.update()
# --- Manage Scrolling ---
# Track if we need to change the viewport
changed = False
# Scroll left
left_bndry = self.view_left + VIEWPORT_MARGIN
if self.player_sprite.left < left_bndry:
self.view_left -= left_bndry - self.player_sprite.left
changed = True
# Scroll right
right_bndry = self.view_left + SCREEN_WIDTH - VIEWPORT_MARGIN
if self.player_sprite.right > right_bndry:
self.view_left += self.player_sprite.right - right_bndry
changed = True
# Scroll up
top_bndry = self.view_bottom + SCREEN_HEIGHT - VIEWPORT_MARGIN
if self.player_sprite.top > top_bndry:
self.view_bottom += self.player_sprite.top - top_bndry
changed = True
# Scroll down
bottom_bndry = self.view_bottom + VIEWPORT_MARGIN
if self.player_sprite.bottom < bottom_bndry:
self.view_bottom -= bottom_bndry - self.player_sprite.bottom
changed = True
if changed:
arcade.set_viewport(self.view_left,
SCREEN_WIDTH + self.view_left,
self.view_bottom,
SCREEN_HEIGHT + self.view_bottom)
window = MyApplication(SCREEN_WIDTH, SCREEN_HEIGHT)
window.setup()
arcade.run()
