Shape List - Skylines

Screenshot of using shape list to create a moving skyline
shape_list_demo_skylines.py
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"""
City Scape Generator

If Python and Arcade are installed, this example can be run from the command line with:
python -m arcade.examples.shape_list_skylines
"""
import random
import arcade
import time

SCREEN_WIDTH = 1200
SCREEN_HEIGHT = 600


def make_star_field(star_count):
    """ Make a bunch of circles for stars. """

    shape_list = arcade.ShapeElementList()

    for star_no in range(star_count):
        x = random.randrange(SCREEN_WIDTH)
        y = random.randrange(SCREEN_HEIGHT)
        radius = random.randrange(1, 4)
        brightness = random.randrange(127, 256)
        color = (brightness, brightness, brightness)
        shape = arcade.create_rectangle_filled(x, y, radius, radius, color)
        shape_list.append(shape)

    return shape_list


def make_skyline(width, skyline_height, skyline_color,
                 gap_chance = 0.70, window_chance=0.30, light_on_chance=0.5,
                 window_color=(255, 255, 200), window_margin=3, window_gap=2,
                 cap_chance=0.20):
    """ Make a skyline """

    shape_list = arcade.ShapeElementList()

    # Add the "base" that we build the buildings on
    shape = arcade.create_rectangle_filled(width / 2, skyline_height / 2, width, skyline_height, skyline_color)
    shape_list.append(shape)

    building_center_x = 0

    skyline_point_list = []
    color_list = []

    while building_center_x < width:

        # Is there a gap between the buildings?
        if random.random() < gap_chance:
            gap_width = random.randrange(10, 50)
        else:
            gap_width = 0

        # Figure out location and size of building
        building_width = random.randrange(20, 70)
        building_height = random.randrange(40, 150)
        building_center_x += gap_width + (building_width / 2)
        building_center_y = skyline_height + (building_height / 2)

        x1 = building_center_x - building_width / 2
        x2 = building_center_x + building_width / 2
        y1 = skyline_height
        y2 = skyline_height + building_height

        skyline_point_list.append( [x1, y1] )

        skyline_point_list.append( [x1, y2] )

        skyline_point_list.append( [x2, y2] )

        skyline_point_list.append( [x2, y1] )

        for i in range(4):
            color_list.append([skyline_color[0],  skyline_color[1], skyline_color[2]] )

        if random.random() < cap_chance:
            x1 = building_center_x - building_width / 2
            x2 = building_center_x + building_width / 2
            x3 = building_center_x

            y1 = y2 = building_center_y + building_height / 2
            y3 = y1 + building_width / 2

            shape = arcade.create_polygon([[x1, y1], [x2, y2], [x3, y3]], skyline_color)
            shape_list.append(shape)

        # See if we should have some windows
        if random.random() < window_chance:
            # Yes windows! How many windows?
            window_rows = random.randrange(10, 15)
            window_columns = random.randrange(1, 7)

            # Based on that, how big should they be?
            window_height = (building_height - window_margin * 2) / window_rows
            window_width = (building_width - window_margin * 2 - window_gap * (window_columns - 1)) / window_columns

            # Find the bottom left of the building so we can start adding widows
            building_base_y = building_center_y - building_height / 2
            building_left_x = building_center_x - building_width / 2

            # Loop through each window
            for row in range(window_rows):
                for column in range(window_columns):
                    if random.random() < light_on_chance:
                        x1 = building_left_x + column * (window_width + window_gap) + window_margin
                        x2 = building_left_x + column * (window_width + window_gap) + window_width + window_margin
                        y1 = building_base_y + row * window_height
                        y2 = building_base_y + row * window_height + window_height * .8

                        skyline_point_list.append( [x1, y1] )
                        skyline_point_list.append( [x1, y2] )
                        skyline_point_list.append( [x2, y2] )
                        skyline_point_list.append( [x2, y1] )

                        for i in range(4):
                            color_list.append( (window_color[0], window_color[1], window_color[2]) )

        building_center_x += (building_width / 2)

    shape = arcade.create_rectangles_filled_with_colors(skyline_point_list, color_list)
    shape_list.append(shape)

    return shape_list


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

    def __init__(self):
        """ Initializer """
        # Call the parent class initializer
        super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, "Skyline Using Buffered Shapes")

        self.stars = make_star_field(150)
        self.skyline1 = make_skyline(SCREEN_WIDTH * 5, 250, (80, 80, 80))
        self.skyline2 = make_skyline(SCREEN_WIDTH * 5, 150, (50, 50, 50))

        arcade.set_background_color(arcade.color.BLACK)

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

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

        # This command has to happen before we start drawing

        start_time = int(round(time.time() * 1000))
        arcade.start_render()

        self.stars.draw()
        self.skyline1.draw()
        self.skyline2.draw()
        end_time = int(round(time.time() * 1000))
        total_time = end_time - start_time

        arcade.draw_text(f"Time: {total_time}", 10, 10, arcade.color.WHITE)

    def update(self, delta_time):
        """ Movement and game logic """
        self.skyline1.center_x -= 0.5
        self.skyline2.center_x -= 1


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


if __name__ == "__main__":
    main()