Practice Quiz 2 Answer Key

def center_circle_soln(grid, radius, ch):
    # First, put an uppercase ch in the center of the grid.
    # Next, fill in all grid locations with ch that create a circle
    # in the center of the grid with the given radius.
    # Basic idea: traverse entire grid, and if a coordinate
    # has a distance to the center of the radius, put ch in that
    # grid location
    center_x = grid.width // 2
    center_y = grid.height // 2
    grid.set(center_x, center_y, ch.upper())

    for y in range(grid.height):
        for x in range(grid.width):
            if distance(x, y, center_x, center_y) == radius:
                grid.set(x, y, ch)


def distance(x1, y1, x2, y2):
    return int(math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)))

def main():
    # Usage:
    # python3 circles.py width height radius ch
    width = int(sys.argv[1])
    height = int(sys.argv[2])
    radius = int(sys.argv[3])
    ch = sys.argv[4][0]

    grid = Grid(width, height)
    center_circle(grid, radius, ch)
    print_grid(grid)

def spell_number_soln(n):
    if n == 100:
        return 'one hundred'

    if n > 100:
        return str(n)

    low_numbers = ['zero', 'one', 'two', 'three', 'four', 'five', 'six',
                   'seven', 'eight', 'nine', 'ten',
                   'eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen',
                   'sixteen', 'seventeen',
                   'eighteen', 'nineteen']
    tens = ['twenty', 'thirty', 'forty', 'fifty', 'sixty', 'seventy', 'eighty',
            'ninety', 'one hundred']

    if n < 20:
        return low_numbers[n]

    ones_digit = n % 10
    tens_digit = n // 10

    word = tens[tens_digit - 2]

    if ones_digit > 0:
        word += f'-{low_numbers[ones_digit]}'
        # alternate: word += '-' + low_numbers[ones_digit]

    return word

def lines_illusion_soln(canvas, width, height, num_lines):
    side_line_length = width / num_lines / 3
    num_y_lines = num_lines * 5

    # canvas.draw_rect(0, 0, width, height)

    for i in range(num_y_lines):
        y_start = i / num_y_lines * height
        y_end = y_start + side_line_length
        for j in range(num_lines):
            if j % 2 == 0:
                x_start = j / num_lines * width
                x_end = x_start + side_line_length
            else:
                x_end = j / num_lines * width
                x_start = x_end + side_line_length

            canvas.draw_line(x_start, y_start, x_end, y_end)