"""
This demo shows the speed of drawing a full grid of squares using no buffering.

For me this takes about 0.850 seconds per frame.

It is slow because we load all the points and all the colors to the card every
time.

If Python and Arcade are installed, this example can be run from the command line with:
python -m arcade.examples.shape_list_demo_1
"""

import arcade
import timeit

SCREEN_WIDTH = 1200
SCREEN_HEIGHT = 800
SCREEN_TITLE = "Shape List Demo 1"

SQUARE_WIDTH = 5
SQUARE_HEIGHT = 5
SQUARE_SPACING = 40


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

    def __init__(self, width, height, title):
        super().__init__(width, height, title)

        arcade.set_background_color(arcade.color.DARK_SLATE_GRAY)

        self.draw_time = 0

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

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

        # Start timing how long this takes
        draw_start_time = timeit.default_timer()

        # --- Draw all the rectangles
        for x in range(0, SCREEN_WIDTH, SQUARE_SPACING):
            for y in range(0, SCREEN_HEIGHT, SQUARE_SPACING):
                arcade.draw_rectangle_filled(x, y, SQUARE_WIDTH, SQUARE_HEIGHT, arcade.color.DARK_BLUE)

        # Print the timing
        output = f"Drawing time: {self.draw_time:.3f} seconds per frame."
        arcade.draw_text(output, 20, SCREEN_HEIGHT - 40, arcade.color.WHITE, 18)

        self.draw_time = timeit.default_timer() - draw_start_time


def main():
    MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)

    arcade.run()


if __name__ == "__main__":
    main()