from PIL import Image, ImageDraw, ImageFont

def sub(p1, p2):
    return (p1[0] - p2[0], p1[1] - p2[1])

def overlay(image_in, message="YOU DIED", color=(200, 25, 25)):
    image = image_in.convert("RGBA")

    size = image.size
    center = (size[0]/2, size[1]/2)
    limit = size[1]
    if size[0] / size[1] < 1:
        limit = int(limit * size[0] / size[1])
    font_size = limit // 5
    gradient_range = limit // 10

    rect_top = sub(center, (0, font_size * 3 // 5))
    rect_bot = sub(center, (0, -font_size * 3 // 5))

    overlay = Image.new("RGBA", size, (0,0,0,0))

    draw = ImageDraw.Draw(overlay)
    font = ImageFont.truetype("OptimusPrinceps.ttf", font_size)

    draw.rectangle([0, rect_top[1], size[0], rect_bot[1]], fill=(0,0,0, 225))

    for y in range(-1, -gradient_range - 1, -1):
        c = 225 - 225 * (-y) // gradient_range
        draw.line([0, rect_top[1] + y, size[0], rect_top[1] + y], fill=(0,0,0,c))

    for y in range(1, gradient_range + 1, 1):
        c = 225 - 225 * (y) // gradient_range
        draw.line([0, rect_bot[1] + y, size[0], rect_bot[1] + y], fill=(0,0,0,c))

    text_size = draw.textsize(message, font=font)

    # in case the text is too long
    ratio = text_size[0] / size[0]

    if ratio > 1:
        font = ImageFont.truetype("OptimusPrinceps.ttf", int(font_size / ratio))
        text_size = draw.textsize(message, font=font)

    offset = (center[0] - text_size[0]/2, center[1] - text_size[1]/2)

    draw.text(offset, message, color, font=font)

    result = Image.alpha_composite(Image.alpha_composite(image, Image.new("RGBA", size, (0,0,0,125))), overlay)
    return result