sprite_simple_platformer.py

"""
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
SPRITE_NATIVE_SIZE = 128

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


class MyGame(arcade.Window):
    """ Main application class. """

    def __init__(self):
        """
        Initializer
        """
        super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT)
        # Sprite lists
        self.all_sprites_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.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)

        # Draw the walls on the bottom
        for x in range(0, SCREEN_WIDTH, int(SPRITE_NATIVE_SIZE * SPRITE_SCALING)):
            wall = arcade.Sprite("images/grassMid.png", SPRITE_SCALING)

            wall.bottom = 0
            wall.left = x
            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)

    def on_draw(self):
        """
        Render the screen.
        """

        # This command has to happen before we start drawing
        arcade.start_render()

        # Draw all the sprites.
        self.player_sprite.draw()
        self.wall_list.draw()

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

        # Update the player based on the physics engine
        if not self.game_over:
            self.physics_engine.update()


def main():
    window = MyGame()
    window.setup()
    arcade.run()


if __name__ == "__main__":
    main()