Moving Platforms
sprite_moving_platforms.py
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Sprite with Moving Platforms
Load a map stored in csv format, as exported by the program 'Tiled.'
Artwork from https://kenney.nl
If Python and Arcade are installed, this example can be run from the command line with:
python -m arcade.examples.sprite_moving_platforms
"""
import arcade
SPRITE_SCALING = 0.5
SCREEN_WIDTH = 1000
SCREEN_HEIGHT = 600
SCREEN_TITLE = "Sprite with Moving Platforms Example"
SPRITE_PIXEL_SIZE = 128
GRID_PIXEL_SIZE = (SPRITE_PIXEL_SIZE * SPRITE_SCALING)
# How many pixels to keep as a minimum margin between the character
# and the edge of the screen.
VIEWPORT_MARGIN = SPRITE_PIXEL_SIZE * SPRITE_SCALING
RIGHT_MARGIN = 4 * SPRITE_PIXEL_SIZE * SPRITE_SCALING
# Physics
MOVEMENT_SPEED = 10 * SPRITE_SCALING
JUMP_SPEED = 28 * SPRITE_SCALING
GRAVITY = .9 * SPRITE_SCALING
class MyGame(arcade.Window):
""" Main application class. """
def __init__(self, width, height, title):
"""
Initializer
"""
super().__init__(width, height, title)
# Sprite lists
# We use an all-wall list to check for collisions.
self.all_wall_list = None
# Drawing non-moving walls separate from moving walls improves performance.
self.static_wall_list = None
self.moving_wall_list = None
self.player_list = None
# Set up the player
self.player_sprite = None
self.physics_engine = None
self.view_left = 0
self.view_bottom = 0
self.end_of_map = 0
self.game_over = False
def setup(self):
""" Set up the game and initialize the variables. """
# Sprite lists
self.all_wall_list = arcade.SpriteList()
self.static_wall_list = arcade.SpriteList()
self.moving_wall_list = arcade.SpriteList()
self.player_list = arcade.SpriteList()
# Set up the player
self.player_sprite = arcade.Sprite(":resources:images/animated_characters/female_person/femalePerson_idle.png",
SPRITE_SCALING)
self.player_sprite.center_x = 2 * GRID_PIXEL_SIZE
self.player_sprite.center_y = 3 * GRID_PIXEL_SIZE
self.player_list.append(self.player_sprite)
# Create floor
for i in range(30):
wall = arcade.Sprite(":resources:images/tiles/grassMid.png", SPRITE_SCALING)
wall.bottom = 0
wall.center_x = i * GRID_PIXEL_SIZE
self.static_wall_list.append(wall)
self.all_wall_list.append(wall)
# Create platform side to side
wall = arcade.Sprite(":resources:images/tiles/grassMid.png", SPRITE_SCALING)
wall.center_y = 3 * GRID_PIXEL_SIZE
wall.center_x = 3 * GRID_PIXEL_SIZE
wall.boundary_left = 2 * GRID_PIXEL_SIZE
wall.boundary_right = 5 * GRID_PIXEL_SIZE
wall.change_x = 2 * SPRITE_SCALING
self.all_wall_list.append(wall)
self.moving_wall_list.append(wall)
# Create platform side to side
wall = arcade.Sprite(":resources:images/tiles/grassMid.png", SPRITE_SCALING)
wall.center_y = 3 * GRID_PIXEL_SIZE
wall.center_x = 7 * GRID_PIXEL_SIZE
wall.boundary_left = 5 * GRID_PIXEL_SIZE
wall.boundary_right = 9 * GRID_PIXEL_SIZE
wall.change_x = -2 * SPRITE_SCALING
self.all_wall_list.append(wall)
self.moving_wall_list.append(wall)
# Create platform moving up and down
wall = arcade.Sprite(":resources:images/tiles/grassMid.png", SPRITE_SCALING)
wall.center_y = 5 * GRID_PIXEL_SIZE
wall.center_x = 5 * GRID_PIXEL_SIZE
wall.boundary_top = 8 * GRID_PIXEL_SIZE
wall.boundary_bottom = 4 * GRID_PIXEL_SIZE
wall.change_y = 2 * SPRITE_SCALING
self.all_wall_list.append(wall)
self.moving_wall_list.append(wall)
# Create platform moving diagonally
wall = arcade.Sprite(":resources:images/tiles/grassMid.png", SPRITE_SCALING)
wall.center_y = 5 * GRID_PIXEL_SIZE
wall.center_x = 8 * GRID_PIXEL_SIZE
wall.boundary_left = 7 * GRID_PIXEL_SIZE
wall.boundary_right = 9 * GRID_PIXEL_SIZE
wall.boundary_top = 8 * GRID_PIXEL_SIZE
wall.boundary_bottom = 4 * GRID_PIXEL_SIZE
wall.change_x = 2 * SPRITE_SCALING
wall.change_y = 2 * SPRITE_SCALING
self.all_wall_list.append(wall)
self.moving_wall_list.append(wall)
self.physics_engine = \
arcade.PhysicsEnginePlatformer(self.player_sprite,
self.all_wall_list,
gravity_constant=GRAVITY)
# 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
self.game_over = False
def on_draw(self):
"""
Render the screen.
"""
# This command has to happen before we start drawing
arcade.start_render()
# Draw the sprites.
self.static_wall_list.draw()
self.moving_wall_list.draw()
self.player_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.
distance = self.player_sprite.right
output = f"Distance: {distance}"
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:
if self.physics_engine.can_jump():
self.player_sprite.change_y = JUMP_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.LEFT or key == arcade.key.RIGHT:
self.player_sprite.change_x = 0
def on_update(self, delta_time):
""" Movement and game logic """
# Call update on all sprites
self.physics_engine.update()
# --- Manage Scrolling ---
# Track if we need to change the viewport
changed = False
# Scroll left
left_boundary = self.view_left + VIEWPORT_MARGIN
if self.player_sprite.left < left_boundary:
self.view_left -= left_boundary - self.player_sprite.left
changed = True
# Scroll right
right_boundary = self.view_left + SCREEN_WIDTH - RIGHT_MARGIN
if self.player_sprite.right > right_boundary:
self.view_left += self.player_sprite.right - right_boundary
changed = True
# Scroll up
top_boundary = self.view_bottom + SCREEN_HEIGHT - VIEWPORT_MARGIN
if self.player_sprite.top > top_boundary:
self.view_bottom += self.player_sprite.top - top_boundary
changed = True
# Scroll down
bottom_boundary = self.view_bottom + VIEWPORT_MARGIN
if self.player_sprite.bottom < bottom_boundary:
self.view_bottom -= bottom_boundary - self.player_sprite.bottom
changed = True
# If we need to scroll, go ahead and do it.
if changed:
arcade.set_viewport(self.view_left,
SCREEN_WIDTH + self.view_left,
self.view_bottom,
SCREEN_HEIGHT + self.view_bottom)
def main():
""" Main function """
window = MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
window.setup()
arcade.run()
if __name__ == "__main__":
main()
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