from cs1lib import *
from ball import Ball

FRAMERATE = 40
TIMESTEP = 1.0 / FRAMERATE
WINDOW_HEIGHT = 200
PIXELS_PER_UNIT = 10
BALL_RADIUS = 2

def draw_ball(x, y, radius, ppu, window_height):
    set_fill_color(1, 0, 0)
    x_pixels = x * ppu
    y_pixels = window_height - y * ppu
    r_pixels = radius * ppu
    draw_circle(x_pixels, y_pixels, r_pixels)


def main():

    ball.x += ball.v_x * TIMESTEP
    ball.y += ball.v_y * TIMESTEP

    draw_ball(ball.x, ball.y, ball.radius, PIXELS_PER_UNIT, WINDOW_HEIGHT)

ball = Ball(10.0, 15.0, 2.0, -2.0, BALL_RADIUS)

start_graphics(main, 1200, framerate=FRAMERATE)