04_views.py Full Listing

04_views.py
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import random
import arcade

# --- Constants ---
SPRITE_SCALING_PLAYER = 0.5
SPRITE_SCALING_COIN = .25
COIN_COUNT = 50

SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
SCREEN_TITLE = "Implement Views Example"


class InstructionView(arcade.View):
    """ View to show instructions """

    def on_show(self):
        """ This is run once when we switch to this view """
        arcade.set_background_color(arcade.csscolor.DARK_SLATE_BLUE)

        # Reset the viewport, necessary if we have a scrolling game and we need
        # to reset the viewport back to the start so we can see what we draw.
        arcade.set_viewport(0, SCREEN_WIDTH - 1, 0, SCREEN_HEIGHT - 1)

    def on_draw(self):
        """ Draw this view """
        arcade.start_render()
        arcade.draw_text("Instructions Screen", SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2,
                         arcade.color.WHITE, font_size=50, anchor_x="center")
        arcade.draw_text("Click to advance", SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2-75,
                         arcade.color.WHITE, font_size=20, anchor_x="center")

    def on_mouse_press(self, _x, _y, _button, _modifiers):
        """ If the user presses the mouse button, start the game. """
        game_view = GameView()
        game_view.setup()
        self.window.show_view(game_view)


class GameOverView(arcade.View):
    """ View to show when game is over """

    def __init__(self):
        """ This is run once when we switch to this view """
        super().__init__()
        self.texture = arcade.load_texture("game_over.png")

        # Reset the viewport, necessary if we have a scrolling game and we need
        # to reset the viewport back to the start so we can see what we draw.
        arcade.set_viewport(0, SCREEN_WIDTH - 1, 0, SCREEN_HEIGHT - 1)

    def on_draw(self):
        """ Draw this view """
        arcade.start_render()
        self.texture.draw_sized(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2,
                                SCREEN_WIDTH, SCREEN_HEIGHT)

    def on_mouse_press(self, _x, _y, _button, _modifiers):
        """ If the user presses the mouse button, re-start the game. """
        game_view = GameView()
        game_view.setup()
        self.window.show_view(game_view)


class GameView(arcade.View):
    """ Our custom Window Class"""

    def __init__(self):
        """ Initializer """
        # Call the parent class initializer
        super().__init__()

        # Variables that will hold sprite lists
        self.player_list = None
        self.coin_list = None

        # Set up the player info
        self.player_sprite = None
        self.score = 0

        # Don't show the mouse cursor
        self.window.set_mouse_visible(False)

        arcade.set_background_color(arcade.color.AMAZON)

    def setup(self):
        """ Set up the game and initialize the variables. """

        # Sprite lists
        self.player_list = arcade.SpriteList()
        self.coin_list = arcade.SpriteList()

        # Score
        self.score = 0

        # Set up the player
        # Character image from kenney.nl
        self.player_sprite = arcade.Sprite(":resources:images/animated_characters/female_person/femalePerson_idle.png",
                                           SPRITE_SCALING_PLAYER)
        self.player_sprite.center_x = 50
        self.player_sprite.center_y = 50
        self.player_list.append(self.player_sprite)

        # Create the coins
        for i in range(COIN_COUNT):

            # Create the coin instance
            # Coin image from kenney.nl
            coin = arcade.Sprite(":resources:images/items/coinGold.png",
                                 SPRITE_SCALING_COIN)

            # Position the coin
            coin.center_x = random.randrange(SCREEN_WIDTH)
            coin.center_y = random.randrange(SCREEN_HEIGHT)

            # Add the coin to the lists
            self.coin_list.append(coin)

    def on_draw(self):
        """ Draw everything """
        arcade.start_render()
        self.coin_list.draw()
        self.player_list.draw()

        # Put the text on the screen.
        output = f"Score: {self.score}"
        arcade.draw_text(output, 10, 20, arcade.color.WHITE, 14)

    def on_mouse_motion(self, x, y, dx, dy):
        """ Handle Mouse Motion """

        # Move the center of the player sprite to match the mouse x, y
        self.player_sprite.center_x = x
        self.player_sprite.center_y = y

    def on_update(self, delta_time):
        """ Movement and game logic """

        # Call update on all sprites (The sprites don't do much in this
        # example though.)
        self.coin_list.update()

        # Generate a list of all sprites that collided with the player.
        coins_hit_list = arcade.check_for_collision_with_list(self.player_sprite, self.coin_list)

        # Loop through each colliding sprite, remove it, and add to the score.
        for coin in coins_hit_list:
            coin.remove_from_sprite_lists()
            self.score += 1

        # Check length of coin list. If it is zero, flip to the
        # game over view.
        if len(self.coin_list) == 0:
            view = GameOverView()
            self.window.show_view(view)


def main():
    """ Main method """

    window = arcade.Window(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
    start_view = InstructionView()
    window.show_view(start_view)
    arcade.run()


if __name__ == "__main__":
    main()