Sprites: Work with a tiled mapΒΆ

Screenshot of using a larger map exported by tiled in a csv format.
"""
Load a map stored in csv format, as exported by the program 'Tiled.'

Artwork from: http://kenney.nl
Tiled available from: http://www.mapeditor.org/
"""
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
RIGHT_MARGIN = 150

# Physics
MOVEMENT_SPEED = 5
JUMP_SPEED = 14
GRAVITY = 0.5


def get_map(filename):
    """
    This function loads an array based on a map stored as a list of
    numbers separated by commas.
    """
    map_file = open()
    map_array = []
    for line in map_file:
        line = line.strip()
        map_row = line.split(",")
        for index, item in enumerate(map_row):
            map_row[index] = int(item)
        map_array.append(map_row)
    return map_array


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_left = 0
        self.view_bottom = 0
        self.game_over = False

    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",
                                           SPRITE_SCALING)

        # Starting position of the player
        self.player_sprite.center_x = 64
        self.player_sprite.center_y = 270
        self.all_sprites_list.append(self.player_sprite)

        # Get a 2D array made of numbers based on the map
        map_array = get_map("map.csv")

        for row_index, row in enumerate(map_array):
            for column_index, item in enumerate(row):

                # For this map, the numbers represent:
                # -1 = empty
                # 0  = box
                # 1  = grass left edge
                # 2  = grass middle
                # 3  = grass right edge
                if item == -1:
                    continue
                elif item == 0:
                    wall = arcade.Sprite("images/boxCrate_double.png",
                                         SPRITE_SCALING)
                elif item == 1:
                    wall = arcade.Sprite("images/grassLeft.png",
                                         SPRITE_SCALING)
                elif item == 2:
                    wall = arcade.Sprite("images/grassMid.png",
                                         SPRITE_SCALING)
                elif item == 3:
                    wall = arcade.Sprite("images/grassRight.png",
                                         SPRITE_SCALING)

                wall.right = column_index * 64
                wall.top = (7 - row_index) * 64
                self.all_sprites_list.append(wall)
                self.wall_list.append(wall)

        self.physics_engine = \
            arcade.PhysicsEnginePlatformer(self.player_sprite,
                                           self.wall_list,
                                           gravity_constant=GRAVITY)

        # Set the background color
        arcade.set_background_color(arcade.color.AMAZON)

        # Set the view port 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 all the sprites.
        self.all_sprites_list.draw()

        # Put the text on the screen.
        # Adjust the text position based on the view port so that we don't
        # scroll the text too.
        distance = self.view_left + self.player_sprite.right
        output = "Distance: {}".format(distance)
        arcade.draw_text(output, self.view_left + 10, self.view_bottom + 20,
                         arcade.color.WHITE, 14)

        if self.game_over:
            output = "Game Over"
            arcade.draw_text(output, self.view_left + 200,
                             self.view_bottom + 200,
                             arcade.color.WHITE, 30)

    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 animate(self, delta_time):
        """ Movement and game logic """

        if self.view_left + self.player_sprite.right >= 5630:
            self.game_over = True

        # Call update on all sprites (The sprites don't do much in this
        # example though.)
        if not self.game_over:
            self.physics_engine.update()

        # --- Manage Scrolling ---

        # Track if we need to change the view port

        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 - RIGHT_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 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)


window = MyApplication(SCREEN_WIDTH, SCREEN_HEIGHT)
window.setup()

arcade.run()