Move with a Scrolling Screen

Screen shot of using a scrolling window
sprite_move_scrolling.py
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"""
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
        """
        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.wall_list.draw()
        self.player_sprite.draw()

    def on_key_press(self, key, modifiers):
        """Called whenever a key is pressed. """

        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 releases a key. """

        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 update(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)


def main():
    """ Main method """
    window = MyApplication(SCREEN_WIDTH, SCREEN_HEIGHT)
    window.setup()
    arcade.run()

if __name__ == "__main__":
    main()